OFDM-based radio proximity detection method and intellectualized method

Technical Field

The invention relates to an OFDM-based radio near the sense detecting method and intelligent method, particularly to a radio near the sense detector target distance estimation method, which belongs to the radio near the sense detection field.

Background Art

The traditional radio near the sense detector is the use of electromagnetic wave environment information perception of the target, the distance from the objective at the best point of output signal of a device or system, its basic function is to transmit the electromagnetic wave, receiving the target echo, and use of various signal processing means of the solution target distance information. As technology advances and the development of the times, defense platform facing new challenges, in particular the guide integrated with the development trend of the intelligent ammunition to require future radio near the sense detector must not only have a basic detection function, of a certain communication function, the linear frequency modulated continuous-wave (Linear Frequency Modulated Continuous Wave, LFMCW) in the traditional sense such as radio near the sense detection system difficult to meet this requirement.

On the other hand, the radio near the sense detector is added in separate communication subsystem is bound to increase the volume of the radio near the sense detector, weight and power consumption. In contrast, the communications-related technology to be studied as a radio near the sense detector target distance estimation method to have more advantages, such, radio near the sense detector does not need to be a separate communication subsystem, is fully software implementation of the decision detecting function or the communication function. For the realization of the detection and communication integration, it is crucial that the radio near the sense detector transmitted baseband signal waveform design and from the target echo signal in the method of extracting distance information. With the OFDM spectrum utilization rate is high, the anti-multipath effect, system parameter selection is flexible, can be discrete Fourier transform to the realization of fast modulation and demodulation and the like, have been widely applied to the tone/video broadcast, and 4th on behalf of the wireless local area network in a mobile communication system. Scholars have study the application of OFDM in the radar field, but because the role of the radio near the sense detector near to each other, where the short time window, with the ordinary radar work face by the distance the situation is different. Radio near the sense detector of the detection algorithm in addition to the distance resolution, anti-interference in such areas as the strict requirements, must be easy to realize, based on OFDM of existing radar detection method is difficult to meet this requirement.

Content of the invention

In the prior art radio near the sense detecting method exists in the following deficiencies: (1) the existing based on LFMCW radio near the sense detection method does not have the communication function, can not meet the radio near the sense detector network and intelligent development of communication request; (2) the role of the radio near the sense detector near to each other, where the short time window, with the ordinary radar work face by the distance the situation is different, radio near the sense detector of the detection algorithm in addition to the distance resolution, anti-interference in such areas as the strict requirements, detection algorithm also must be easy to realize, based on OFDM of existing radar detection method is difficult to meet the above mentioned requirements. The invention discloses a based on OFDM radio near the sense detection method technical problem to be solved is to achieve radio near the sense detector target distance estimation, at the same time has the following advantages: (1) radio near the sense detector does not need the hardware components of the laminant to realize the communication function, to realize the detecting subsystem and the communication subsystem integrated, at the same time effectively reduce the size of the radio near the sense detector, weight and power consumption; (2) the distance the estimation procedure with the specific emission data-independent, emission data with random therefore is not easy to be jammer identification, improve the radio-near the sense detector anti-interference.

The invention also discloses a OFDM-based radio near the sense detecting intelligent method, in the present invention discloses a based on OFDM radio near the sense detecting method to realize the radio near the sense detector on the basis of the estimation of the target distance, can also improve the radio-near the sense detector intelligent level, maintaining a radio near the sense detector hardware platform, in radio near the sense detector signal processing algorithm module is added to the work mode selection function, through the software programming choice detection mode or communication mode to realize the corresponding detecting function or the communication function, radio near the sense detector does not need the hardware components of the laminant to realize the communication function, to realize the detecting subsystem and the communication subsystem integrated; radio near the sense detector repeat selection detection mode or the communication mode, the use of detection function acquires the target distance information, using the communication function of the detected target distance information and self state information data transmission, realize the radio near the sense detector and detecting network other detection node in the collaborative work between the, so as to improve the radio near the sense detector intelligent level of purpose.

The purpose of this invention is realized through the following technical scheme:

The invention discloses a based on OFDM radio near the sense detection method, according to the radio near the sense detector detection tasks carried out by the detection algorithm range resolution Δ R and the maximum not fuzzy distance R_MUTR The requirements of, pre-set OFDM system parameter and transmitted complex modulation symbol D (k), the determination of the radio near the sense detector emission end OFDM baseband pulse signal x (t); radio near the sense detector receives the reflected echo signal by the target, to the receiving end of the baseband OFDM pulse signal y (t) to receive the OFDM demodulation of the complex modulation symbols D_r (K); utilize launching the complex modulation symbols D (k) and unpack the modulation symbol D_r (K) calculating the channel transfer function I_Div (K); I the channel transfer function_Div (K) on the transformed IDFT h (n); by the h (n) of the maximum value of the the mold takes when calculating the value n corresponding to the target distance, realize the radio near the sense detector target distance the purpose of the estimates.

The invention discloses a based on OFDM radio near the sense detection method, comprising the following steps:

Step (1), according to the radio near the sense detector detection tasks carried out by the detection algorithm range resolution Δ R and the maximum not fuzzy distance R_MUTR Request, in accordance with the formula (1) and formula (2) shown relations, pre-set OFDM system parameter and transmitted complex modulation symbol D (k), the determination of the radio near the sense detector emission end OFDM baseband pulse signal x (t).

And R_MUTR _AOMARKENCODEGTX0AO _ R_Max (2)

Wherein: R_Max For the radio near the sense detector detection tasks carried out by the maximum detection distance, the pre-setting of the OFDM system parameters include: the number of OFDM carriers N baseband general brokerages, sub-carrier frequency interval T Δ f and cyclic prefix length_g , Wherein the sub-carrier frequency interval Δ f must satisfy Δ f _aogtao_ _aogtao_ f_d , F_d =2v_Rel f_c The goal/c is generated by relative movement of the Doppler frequency shift, v_Rel As the goal relative movement speed, f_c For the carrier frequency, the length of the cyclic prefix T_g Must meet T_g _aogtao_ _aogtao_ 2R_Max /C.

The radio near the sense detector emission end OFDM baseband pulse signal x (t) expression of formula (3) as shown:

Wherein f_k K=k Δ f is of sub-carrier frequency, T=1 / Δ f as the basic OFDM symbol duration, are not included in the cyclic prefix length T_g .

Step (2), according to step (1) in the radio near the sense detector emission end OFDM baseband pulse signal x (t), obtained by the target to reach the radio near the sense detector receiving end of the OFDM baseband pulse signal y (t), to the receiving end of the baseband OFDM pulse signal y (t) to receive the OFDM demodulation of the complex modulation symbols D_r (K).

Said receiving end OFDM baseband pulse signal y (t) and unpack the modulation symbol D_r (K) expression of formula (4) as shown:

Wherein R is the target distance, when the carrier frequency f_c Is far greater than the sub-carrier frequency interval when Δ f, the Doppler shift of each sub-carrier are approximately equal, T_Sym =T + T_g As includes the cyclic prefix length of the OFDM symbol duration, receiving the complex modulation symbols D_r (K) to contain the target distance and relative movement caused by R all of the distortion information.

Step (3), according to step (1) the complex modulation symbols transmitted in D (k) and step (2) in the modulation symbol D multiplexed_r(K), calculating the channel transfer function I_Div (K).

The channel transfer function I_Div (K) the calculation formula of the formula (5) as shown:

The channel transfer function I_Div (K) the formula for calculating through operation eliminates the complex modulation symbols transmitted D (k), namely the distance estimation process with the specific emission data-independent, because the emission data with random therefore is not easy to be jammer identification, so as to improve the radio-near the sense detector anti-interference capability.

Step (4), according to step (3) in the I channel transfer function_Div (K) computing h (n).

The h (n) through the I channel transfer function_Div (K) to carry out the inverse discrete Fourier transform (IDFT) to obtain, h (n) the calculation formula:

Wherein l (n)=n - 2N Δ fR/c.

Step (5), according to the step (4) in h (n) the computation of the target distance R, to realize radio near the sense detector target distance estimation.

The target distance R the calculation formula of the formula (7) as shown:

Wherein n is the states the step (4) obtained h (n) of the maximum value of the the mold takes when corresponding n value.

The invention also discloses a OFDM-based radio near the sense detecting intelligent method, in the stated based on OFDM radio near the sense detecting method to realize the radio near the sense detector on the basis of the estimation of the target distance, can also improve the radio-near the sense detector intelligent level, maintaining a radio near the sense detector hardware platform, in radio near the sense detector signal processing algorithm module is added to the work mode selection function, through the software programming choice detection mode or communication mode to realize the corresponding detecting function or the communication function, radio near the sense detector does not need the hardware components of the laminant to realize the communication function, to realize the detecting subsystem and the communication subsystem integrated; radio near the sense detector repeat selection detection mode or the communication mode, the use of detection function acquires the target distance information, using the communication function of the detected target distance information and self state information data transmission, realize the radio near the sense detector and detecting network other detection node in the collaborative work between the, so as to improve the radio near the sense detector intelligent level of purpose.

The invention also discloses a based on OFDM radio near the sense detecting intelligent method, according to the radio near the sense detector carried out by the detection task selection detection mode or the communication mode; when the selected detection mode, according to the radio near the sense detector detection tasks carried out by the detection algorithm range resolution Δ R and the maximum not fuzzy distance R_MUTR The requirements of, pre-set OFDM system parameter and transmitted complex modulation symbol D (k), the determination of the radio near the sense detector emission end OFDM baseband pulse signal x (t); radio near the sense detector receives the reflected echo signal by the target, to the receiving end of the baseband OFDM pulse signal y (t) to receive the OFDM demodulation of the complex modulation symbols D_r (K); utilize launching the complex modulation symbols D (k) and unpack the modulation symbol D_r (K) calculating the channel transfer function I_Div (K); I the channel transfer function_Div (K) on the transformed IDFT h (n); by the h (n) of the maximum value of the the mold takes when calculating the value n corresponding to the target distance; when the selection of a communication mode, first send data or receive data judging; when the selection at the transmission data, the detection to the target distance information and self state information according to the original data with the radio near the sense detector detecting network at about scheduled communication protocol encoding of emission D complex modulation symbols (k), according to the radio near the sense detector is connected with the detecting network between at promises to be the communication protocol, the pre-set parameters of the OFDM system, the determination of the radio near the sense detector emission end OFDM baseband pulse signal x (t); when the selection data is received, in accordance with the radio near the sense detector is connected with the detecting network between at promises to communication protocol, to the receiving end of the baseband OFDM pulse signal y (t) to receive the OFDM demodulation of the complex modulation symbols D_r (K), to recover the modulation symbol D butt joint_r (K) in accordance with the radio near the sense detector is connected with the detecting network between at promises to be the communication protocol obtained by decoding the detecting other network node transmission data; according to the implementation of the detection task require repeated detection mode or the communication mode, until the completion of the implementation of the detection task.

The invention also discloses a based on OFDM radio near the sense detecting intelligent method, comprises the following steps:

Step 1, according to the radio near the sense detector carried out by the detection task selection detection mode or the communication mode.

Step 2, according to the step 1 the selected detection mode or communication mode to realize the corresponding communication function or detecting function.

Step 2.1, based on the OFDM radio near the sense detection function.

Step (1), according to the radio near the sense detector detection tasks carried out by the detection algorithm range resolution Δ R and the maximum not fuzzy distance R_MUTR Request, in accordance with the formula (1) and formula (2) shown relations, pre-set OFDM system parameter and transmitted complex modulation symbol D (k), the determination of the radio near the sense detector emission end OFDM baseband pulse signal x (t).

And R_MUTR _AOMARKENCODEGTX0AO _ R_Max (2)

Wherein R_Max For the radio near the sense detector detection tasks carried out by the maximum detection distance, the pre-setting of the OFDM system parameters include: the number of OFDM carriers N baseband general brokerages, sub-carrier frequency interval T Δ f and cyclic prefix length_g , Wherein the sub-carrier frequency interval Δ f must satisfy Δ f _aogtao_ _aogtao_ f_d , F_d =2v_Rel f_c The goal/c is generated by relative movement of the Doppler frequency shift, v_Rel As the goal relative movement speed, f_c For the carrier frequency, the length of the cyclic prefix T_g Must meet T_g _aogtao_ _aogtao_ 2R_Max /C.

The radio near the sense detector emission end OFDM baseband pulse signal x (t) expression of formula (3) as shown:

Wherein f_k K=k Δ f is of sub-carrier frequency, T=1 / Δ f as the basic OFDM symbol duration, are not included in the cyclic prefix length T_g .

Step (2), according to step (1) in the radio near the sense detector emission end OFDM baseband pulse signal x (t), obtained by the target to reach the radio near the sense detector receiving end of the OFDM baseband pulse signal y (t), to the receiving end of the baseband OFDM pulse signal y (t) to receive the OFDM demodulation of the complex modulation symbols D_r (K).

Said receiving end OFDM baseband pulse signal y (t) and unpack the modulation symbol D_r (K) expression of formula (4) as shown:

Wherein R is the target distance, when the carrier frequency f_c Is far greater than the sub-carrier frequency interval when Δ f, the Doppler shift of each sub-carrier are approximately equal, T_Sym =T + T_g As includes the cyclic prefix length of the OFDM symbol duration, receiving the complex modulation symbols D_r (K) to contain the target distance and relative movement caused by R all of the distortion information.

Step (3), according to step (1) the complex modulation symbols transmitted in D (k) and step (2) in the modulation symbol D multiplexed_r(K), calculating the channel transfer function I_Div (K).

The channel transfer function I_Div (K) the calculation formula of the formula (5) as shown:

The channel transfer function I_Div (K) the formula for calculating through operation eliminates the complex modulation symbols transmitted D (k), namely the distance estimation process with the specific emission data-independent, because the emission data with random therefore is not easy to be jammer identification, so as to improve the radio-near the sense detector anti-interference capability.

Step (4), according to step (3) in the I channel transfer function_Div (K) computing h (n).

The h (n) through the I channel transfer function_Div (K) to carry out the inverse discrete Fourier transform (IDFT) to obtain, h (n) the calculation formula:

Wherein l (n)=n - 2N Δ fR/c.

Step (5), according to the step (4) in h (n) the computation of the target distance R, to realize radio near the sense detector target distance estimation.

The target distance R the calculation formula of the formula (7) as shown:

Wherein n is the states the step (4) obtained h (n) of the maximum value of the the mold takes when corresponding n value.

Step 2.2, based on the OFDM radio near the sense detector communication function.

Step (1), according to the radio near the sense detector carried out by the detection task and radio near the sense detector is connected with the detecting network at about scheduled communication protocol selection communication function of transmitting the data subfeatures or receiving data subfeatures.

The radio near the sense detector is connected with the detecting network at about scheduled communication protocol includes the existing technology in the wireless communication protocol, such as 802.11a, also includes other user-customized protocol.

Step (2), according to step (1) of the selection result to realize the corresponding sending data subfeatures or receiving data subfeatures.

Step 1), based on the OFDM radio near the sense detector in communication function of transmitting the data subfeatures.

Step i, the radio near the sense detector detects the target distance information and self state information according to the original data with the radio near the sense detector detecting network at about scheduled communication protocol encoding of emission D complex modulation symbols (k).

Step ii, according to radio near the sense detector is connected with the detecting network between at promises to be the communication protocol, the pre-set parameters of the OFDM system, the determination of the radio near the sense detector emission end OFDM baseband pulse signal x (t).

Step 2), based on the OFDM radio near the sense detector in communication function of receiving the data subfeatures.

Step i, in accordance with the radio near the sense detector is connected with the detecting network between at promises to communication protocol, to the receiving end of the baseband OFDM pulse signal y (t) to receive the OFDM demodulation of the complex modulation symbols D_r (K).

Step ii, butt to recover the modulation symbol D_r (K) in accordance with the radio near the sense detector is connected with the detecting network between at promises to be the communication protocol obtained by decoding the detection network other detection node transmission of data.

Step 3, according to the implementation of the radio near the sense by a detector detecting the need of tasks, repeat step 1, step 2, using detection function acquires the target distance information, using the communication function of the detected target distance information and self state information data transmission, realize the radio near the sense detector and detecting network other detection node in the collaborative work between the, until the completion of the detection task.

The beneficial effect:

1. the invention discloses a based on OFDM radio near the sense detecting method and intelligent method, and the like against LFMCW in the traditional sense of the radio near the sense detection system does not have the communication function, in order to improve the radio near the sense detector intelligent level, radio near the sense detector compared with adding a separate communication subsystem, the invention will be widely used in the field of communication OFDM technology is applied to the radio near the sense detector target distance estimation, realize the detecting subsystem and the communication subsystem integration, such, radio near the sense detector does not need to be a separate communication subsystem, is fully software decision to achieve the detection function or the communication function. Radio near the sense of the detector by detecting function acquires the target distance information, using the communication function of the detected target distance information and self state information data transmission, realize the radio near the sense detector and detecting network other detection node in the collaborative work between the, improve the radio intelligent level near the sense of the detector. At the same time, radio near the sense detector does not need the hardware components of the laminant to realize the communication function, can effectively reduce the size of the radio near the sense detector, weight and power consumption.

2. the invention discloses a based on OFDM radio near the sense detection method, the step (3) in the I channel transfer function_Div (K) by the operation of the formula for calculating the complex modulation symbols transmitted cancel out the D (k), namely the distance estimation process with the specific emission data-independent, emission data with random therefore is not easy to be jammer identification, so as to improve the radio-near the sense detector anti-interference.

Description of drawings

Figure 1 is the radio near the sense detecting method and intelligent method through the graph of radio near the sense detector system block diagram, wherein the invention discloses a based on OFDM 1 signal processing algorithm module in the software programming;

Figure 2 is the flow chart of the present invention discloses a based on OFDM radio near the sense detection method;

Figure 3 is the simulation result diagram of the embodiment of the invention 1;

Figure 4 is the schematic view a typical application scenarios, diagram of the present invention also discloses a based on OFDM radio near the sense detecting intelligent method in detecting node 1 to the detection node M form a detection network, detecting network includes at least one radio near the sense detector, other detection node may be command and control platform, such as the communication relay station, detecting network detects the existence of the node between the plurality of communication link to the collaborative work;

Figure 5 is the flow chart of the present invention also discloses a based on OFDM radio near the sense detecting intelligent method.

Mode of execution

The lower part of the embodiment of the Figure and content of the invention further description, the following implementation example by this technical proposal is the premise of the invention implementation, provides detailed embodiments and specific operation process, but the scope of protection of the present invention is not limited to the following embodiment.

Embodiment 1

This embodiment of the invention discloses a based on OFDM radio near the sense detection method the technical scheme and the embodiment of the explanation. In order to realize the distance resolution 6m, 30m detection task in for example, the combination of Figure 2 is shown in the flow chart, comprising the following steps:

Step (1), according to the radio near the sense detector detection tasks carried out by the detection algorithm range resolution Δ R and the maximum not fuzzy distance R_MUTR Request, in accordance with the formula (1) and formula (2) shown relations, pre-set OFDM system parameter and transmitted complex modulation symbol D (k), the determination of the radio near the sense detector emission end OFDM baseband pulse signal x (t).

And R_MUTR _AOMARKENCODEGTX0AO _ R_Max (2)

Wherein R_Max =30m radio near the sense detector for detecting tasks carried out by the maximum detection distance, the pre-set parameters of the OFDM system of the result of calculation as: OFDM baseband letter carrier number brokerages N=64, sub-carrier frequency interval Δ f=390.625KHz and cyclic prefix length T_g =0.64μs, its neutron carrier frequency interval Δ f=390.625KHz meet Δ f _aogtao_ _aogtao_ f_d , F_d =2v_Rel f_c /C ≈ 1.83KHz generated by relative movement of the target Doppler frequency shift, v_Rel =50m/s for the target relative movement speed, f_c =5 . 5GHz is carrier frequency, cyclic prefix length T_g =0.64μs meet T_g _aogtao_ _aogtao_ 2R_Max /C, 2R_Max /C=0. 2μs.

The radio near the sense detector emission end OFDM baseband pulse signal x (t) by fig. 1 in the realization of the OFDM modulation module, transmitting OFDM baseband pulse signal x (t) expression of formula (3) as shown:

Wherein f_k =k Δ f=390.625kKHz of sub-carrier frequencies for k, T=1 / Δ f=2.56μs as the basic OFDM symbol duration, are not included in the cyclic prefix length T_g .

Said step (1) in the baseband OFDM transmitting pulse signal x (t) by fig. 1 orthogonal frequency conversion module on the synthetic carrier, carrier frequency f_c =5 . 5GHz, through the transmitting antenna space radiation.

Step (2), the step (1) in the radio near the sense detector the signal is target reflection, part of the energy is radio near the sense detector receiving antenna receiving, through Figure 1 in after the quadrature down conversion module, by receiving OFDM baseband pulse signal y (t), to the receiving end of the baseband OFDM pulse signal y (t) to receive the OFDM demodulation of the complex modulation symbols D_r (K).

Said receiving end OFDM baseband pulse signal y (t) and unpack the modulation symbol D_r (K) expression of formula (4) as shown:

Wherein R is the target distance, the carrier frequency f_c =5 . 5GHz and sub-carrier frequency interval Δ f=390.625KHz meet f_c _aogtao_ _aogtao_ Δ f, the Doppler shift of each sub-carrier are approximately equal, T_Sym =T + T_g =3 . 2μs is includes the cyclic prefix length of the OFDM symbol duration, receiving the complex modulation symbols D_r (K) to contain the target distance and relative movement caused by R all of the distortion information.

Step (3), according to step (1) the complex modulation symbols transmitted in D (k) and step (2) in the modulation symbol D multiplexed_r(K), calculating the channel transfer function I_Div (K).

The channel transfer function I_Div (K) the calculation formula of the formula (5) as shown:

The channel transfer function I_Div (K) the formula for calculating through operation eliminates the emission data D (k), namely the distance estimation process with the specific emission data-independent, because the emission data with random therefore is not easy to be jamming recognition, improve the radio-near the sense detector anti-interference capability.

Step (4), according to step (3) in the I channel transfer function_Div (K) computing h (n).

The h (n) through the I channel transfer function_Div (K) to carry out the inverse discrete Fourier transform (IDFT) to obtain, h (n) the calculation formula:

Wherein l (n)=n - 2N Δ fR/c.

Step (5), according to the step (4) in h (n) the computation of the target distance R, to realize radio near the sense detector target distance estimation.

The target distance R the calculation formula of the formula (7) as shown:

Wherein n is the states the step (4) obtained h (n) of the maximum value of the the mold takes when corresponding n value.

This embodiment corresponding to the simulation result of the simulation has been selected as shown in Figure 3, 7 has typical representative target distance R, to the lower Figure 3 shown in a detailed analysis of the results of the simulation:

(1) R=6m, 12m, 18m and 300m this 4 target distance value is less than the maximum not fuzzy distance R_MUTR =384m and distance resolution Δ R=6m is an integer multiple of, from Figure 3 it can be seen that the simulation results shown, the invention discloses a detection algorithm in accordance with the established distance resolution can accurately distinguish this 4 target distance value;

(2) R=960m this target distance value although the distance resolution Δ R=6m is an integer multiple of, but it is greater than the fuzzy distance R and the biggest_MUTR =384m, therefore in fig. 3 shown in the results of the simulation are not accurately tell, but is detected as "recurve" 6 × (960 ÷ 6 - 64 × 2)=192m, the results consistent with the maximum not fuzzy distance R_MUTR The physical meaning of the;

(3) R=60.6m and R=123m these two target distance value although the maximum not fuzzy distance R is smaller than the_MUTR =384m, but they are not the distance resolution Δ R=6m of the integer times, therefore in fig. 3 shown in the simulation result of the same has not been accurately tell the difference, and the two are detected as 6 × 10=60m and 6 × 20=120m, the result conforms to the distance resolution of the physical meaning of the Δ R.

Embodiment 2

The embodiment of the present invention also discloses a based on OFDM radio near the sense detecting intelligent method the technical scheme and explain the specific embodiment, the combination of Figure 4 is shown in schematic view application scene and Figure 5 as shown in the flow chart, still in order to realize the distance resolution 6m, 30m in the example of the detection task, comprising the following steps:

Step 1, according to the radio near the sense detector carried out by the detection task selection detection mode or the communication mode.

Step 2, according to the step 1 the selected detection mode or communication mode to realize the corresponding communication function or detecting function.

Step 2.1, based on the OFDM radio near the sense detection function.

This step with the content of the embodiment 1 the same, refer to embodiment 1.

Step 2.2, based on the OFDM radio near the sense detector communication function.

Step (1), according to the radio near the sense detector carried out by the detection task and radio near the sense detector is connected with the detecting network at about scheduled communication protocol selection communication function of transmitting the data subfeatures or receiving data subfeatures.

The radio near the sense detector is connected with the detecting network at about scheduled communication protocol includes the existing technology in the wireless communication protocol, such as 802.11a, also includes other user-customized protocol.

Step (2), according to step (1) of the selection result to realize the corresponding sending data subfeatures or receiving data subfeatures.

Step 1), based on the OFDM radio near the sense detector in communication function of transmitting the data subfeatures.

Step i, the radio near the sense detector detects the target distance information and self state information according to the original data with the radio near the sense detector detecting network at about scheduled communication protocol encoding of emission D complex modulation symbols (k).

Step ii, according to radio near the sense detector is connected with the detecting network between at promises to be the communication protocol, the pre-set parameters of the OFDM system, the determination of the radio near the sense detector emission end OFDM baseband pulse signal x (t).

Step 2), based on the OFDM radio near the sense detector in communication function of receiving the data subfeatures.

Step i, in accordance with the radio near the sense detector is connected with the detecting network between at promises to communication protocol, to the receiving end of the baseband OFDM pulse signal y (t) to receive the OFDM demodulation of the complex modulation symbols D_r (K).

Step ii, butt to recover the modulation symbol D_r (K) in accordance with the radio near the sense detector is connected with the detecting network between at promises to be the communication protocol obtained by decoding the detection network other detection node transmission of data.

Step 3, according to the implementation of the radio near the sense by a detector detecting the need of tasks, repeat step 1, step 2, using detection function acquires the target distance information, using the communication function of the detected target distance information and self state information data transmission, realize the radio near the sense detector and detecting network other detection node in the collaborative work between the, until the completion of the detection task.

The combination of the above specific embodiment of the invention discloses a based on OFDM radio near the sense detecting method and intelligent method the technical scheme and the specific embodiment described, but these instructions cannot be interpreted as limiting the scope of the invention, these are only examples, can be made to these embodiments a plurality of alteration or modification, without departing from the principle of the invention and substance. The scope of protection of this invention by the accompanying claims limit, any claim of this invention on the basis of the changes of the scope of protection of the present invention.