FMCW RADAR WITH MULTI-BANDWIDTH AND CONTROL METHOD THEREOF

In the embodiment of the constitution of the invention combining elements such as hereinafter in which those features are disclosed. A selectively positionable without explicit referred to separate each element or feature can be considered. Each element or other components or features can be combined with features form in the embodiment. In addition, some components and/or features of the present invention in the embodiment in order to compose the disapproval. In the sequence of operation of the present invention in the embodiment described can be changed. In the embodiment can be included in the embodiment portion of either construction or other features, or other corresponding configurations or features in the embodiment can be replaced.

In description hereinafter in, FMCW radar and/or radar system can be FMCW radar signal based means.

In addition, in to the elucidation of the hereinafter, the frequency of the signal received by a receiver intermediate frequency (intermediate frequency, IF) frequency of a local oscillator (Local Oscillator) corresponding to the difference frequency can be defines. Herein X - and/or intermediate frequency band band transmitted signals can be set for the received signal.

In addition, in to the elucidation of the hereinafter, having a frequency 2 close frequency (beat frequency) is caused by the difference between the frequency of the signal of a vibration wave frequency can be defines. Bit frequency signal and the transmission signal generated by the difference between the reception by echoes from object vibration wave frequency can be defines.

The understanding of the present invention presents a description of specific terms used hereinafter to aid which number, the use of technical idea of the present invention from deviating from this specific terms can be inputted in another aspect change.

In some cases, the device of the present invention general outline publicly known structure and is exposed to light in order to avoid becoming obscured, each structure and device of core functions also can be shown about block format. In addition, the specification for the same element in an entire use the same drawing code through a browser substrate.

Figure 1 shows a conventional system of FMCW radar unit data of intermediate frequency according to 0 - techniques are disclosed.

In Figure 1 voltage number [...] (Voltage Control Oscillator, VCO, 110), local oscillator (Local Oscillator, LO, 112), and a mixer (Mixer, 111) is X - band signal source JPO. For example, voltage [...] number (110) is 1 - 1. 5GHz band outputs, local oscillator (112) is 8. 7 GHz that outputs a signal having a frequency of disapproval. In addition, X - band signal source can be as an output signal output from the signal transmission. In addition, object and a signal received from a signal source from a transmitted signal is X - band mixer (113) frequency (fb) applied to the detection of a plurality of hierarchies. In Figure 1, communication circuit (100) is do not have the intermediate-frequency signal source. I.e., a data transmitting circuit of Figure 1 (100) is of FMCW radar 0 - intermediate frequency can be used. A data transmitting circuit of Figure 1 (100) has a relatively simple structure. However, the received signal transmission signal directly mixer (113) since the applied, can be a thumb while external noise.

Figure 2 shows a conventional system of FMCW radar unit data of intermediate frequency according to techniques are disclosed.

A data transmitting circuit of Figure 2 (200) for generating the intermediate frequency oscillator (210) contains a. Intermediate frequency oscillator (210) the signal from the voltage number [...] (212) with signal from mixer (213) is applied to, the combined signal is outputted as an output signal therefrom. For example, voltage number [...] (212) is 9. 7 - 10. 2 GHz band configured to output signal disapproval. In addition, the received signal voltage number [...] (212) with signal from mixer (214) applied. The, mixer (214) is intermediate frequency oscillator (210) and outputs a signal having a frequency added from intermediate frequency and bit frequency. Mixer (214) signal from the intermediate frequency oscillator (210) with the signal from the mixer (211) are applied. Mixer (211) and a bit frequency can be output. A data transmitting circuit of Figure 2 (200) is a data transmitting circuit of Figure 1 to the end of intermediate frequency (100) degrees of stable performance. However, relatively high frequency band X - band band number [...] operation voltage (212) is used since relatively high cost to 10sup16.

Figure 3 shows a configuration of one in the embodiment according to FMCW radar unit data also are disclosed.

A data transmitting circuit of Figure 3 (300) is divided into two parts can be greatly. A data transmitting circuit (300) is operating in L - band FMCW generator (310) and a mixer (311) number 1 stage (stage) and X - band consisting of operating in local oscillator (312) on mixer (313 and 314) can be divided into a stage consisting of number 2.

A data transmitting circuit of Figure 3 (300) is 0 - intermediate frequency of reception characteristic by applying a frequency conversion circuit even number 1 end, frequency of the transmission signal of the received signal frequency difference signal to a middle frequency and compounds can be utilized in a similar manner.

For example, in of Figure 3 in the embodiment, FMCW generator (310) is 1 - 1. 5 GHz signal outputs, local oscillator (312) is 8. 7 GHz signal can be configured to output. The, mixer (313) the signals of the signal outputted from the band X - (e.g., 9. 7 - 10. 2 GHz) can be output. Mixer (314) is FMCW generator (310) frequency-speed signal to the digital signal, number 1 stage FMCW generator (310) and a mixer (311) is L - band can be configured to operate in both.

In of Figure 3 in the embodiment, communication circuit (300) is because of 2 in each stage, are more stable than those mixer (311, 313, and 314) can be [...] operation of number. In addition, received signal (e.g., carrier) as compared to a relatively low frequency VCO circuit with number [...] (310) to the end of the, communication circuit (300) can be performed more for small design/number hereinafter.

In the embodiment according to Figure 4 shows a waveform of the received signal waveform of a transmission signal when one also etched.

Generally, the radar system is one modulated FCMW with an object signal detecting substrate. However, when using different modulation or bandwidth signal with object detection, object detection is set again should be performed as follows. The, for changing system settings may result through a as well as, more time can be engaged.

The, frequency modulated continuous wave (FMCW) of the present invention transmits and having different modulation and/or bandwidth signal that is disclosed. For example, methods for modulating the frequency of the continuous wave modulation and/or bandwidth of frequency synthesis 2 having different generated by disapproval.

For example, as shown in fig. 4, the lowered with frequency modulation continuous wave modulation and bandwidth can be set on the third signal hereinafter. In Figure 4, the third T_M1 Period of time rises and, band width (Δ f₁ ) Is f₁ - F₀ Are disclosed. In addition, falling signal is T_M2 Period of time falling and its band width (Δ f₂ ) Is f₂ - F₀ Selected to. Wherein, T_M1 And T_M2 Are each part is cooled may also be used but, be set so that the different distance disapproval. Also 4 FMCW signal such as by using different modulation and bandwidth simultaneously permits target detection signal.

On the other hand, receiving a carrier of, different supplies the second received signal can be received, reception of the signal at receiver selectively measuring needs to be disclosed. Thus, a signal recording device (Data AQcuisition, DAQ) gathered on a recording time can be set to respective band hereinafter. For example, each recording time of signal transmission time axis overlaps the receiver signals can be a set time. In of Figure 4 in the embodiment, in the case of the third, recording time is Tsweep 1 can be set. In addition, in the case of falling signal, recording time is Tsweep 2 can be set. As shown in fig. 4, a time delay between the transmission receiver signals (t_d ) Is present due to gap (gap). In this data collection device includes a signal is obtained not. In addition, time delay (t_d ) Adjacent to enter from a modulated signal due to gap (gap) for blocking can be bit frequency functions as a guard interval. In of Figure 4 in the embodiment, each recording time is set by the starting and/or termination trigger set condition (Tsweep 1 and Tsweep 2) disapproval. For example, a descending or rising edge (edge) each recording time (Tsweep 1 and Tsweep 2) be terminated by triggering or disapproval. In addition, time delay t_d Is a predetermined value or, a value that is set by user input disapproval.

In of Figure 4 in the embodiment, for example, Δ f₁ And the 500 MHz, Δ f₂ Set the 300MHz disapproval. In addition, modulation time T_M1 And T_M2 The inside and outside of the set time 1 ms may be disclosed.

Figure 5 shows a specific configuration in the embodiment FMCW radar unit data according one also are disclosed.

A data transmitting circuit of Figure 5 (500) is a data transmitting circuit of Figure 3 (300) is more specifically shown, the left block (531, 532, 533, 534, 535, 536, 536 and 538) operating in the L - band right end block number 1 (510, 511,512, 513, 514 and 515) operating in the X - band exhibits number 2 stage.

In Figure 5, local oscillator (521) is X band having a frequency of signal CLK3. For example, local oscillator (521) is 8. 7 GHz with respect to disapproval. In addition, FMCW signal generator (531) is configured to generate a frequency-modulated signal can be predetermined. For example, FMCW signal generator (531) is configured to generate the above-described type of signal 4 also respect to the disapproval. FMCW signal generator (531) number or voltage [e oscillator implemented via a voltage from the combination number [...] disapproval.

First, setting up of a transmitter is described substrate. FMCW signal generator (531) the signal from the noise every other number, a lamppost (532) via mixer (520) can be applied to disclosed. A lamppost (532) is, e.g., 1 - 1. 5 GHz with be set so that the pass band of disapproval. Mixer (520) is a local oscillator FMCW (521) by signal from outputs. Special number for noise power amplification, the bandpass filter output signal (510), low noise amplifier (Low Noise Amplifier, 511), attenuator (512) and power amplifier (513) can be transmitted via. For example, band pass filter (510) is 9. 5 - 10. 5 GHz of the passband can be decided so, attenuator (512) is the attenuation of performing range 0 to 30dB disapproval.

The received signal has a number of special noise amplification a band pass filter (515) and analog converter (514) via local oscillator (521) with signal from mixer (523) are applied. Mixer (523) outputted from the local oscillator (521) number for reparing over the frequency of the clock signal, L - band signal are disclosed. Mixer (523) signal from the lamppost (523), analog converter (537), a lamppost (536), analog converter (535), and band pass filter (534) via mixer (543) are applied. Mixer (543) FMCW signal applied to the received signal frequency is detected and volatile FMCW signal component is number can be. Mixer (543) signal from the lamppost (542) and base - band amplifier (541) post-processing process such as can be. As shown in fig. 5, local oscillator (521) number of frequency components for easier processing of the received signal for reparing over current won (522 and 533) can be used.

On the other hand, base - band amplifier (541) signal from the data collection device (DAQ, not shown) may be applied to disclosed. As also described above in conjunction 4, having different modulation and/or bandwidth of if signal is 2, data collection device to FMCW signal generator (531) triggering (triggering) from disapproval signal is asserted. For example, triggering signal rising edge and/or falling edge of the FMCW signal generated according disapproval. Data collection device includes a FMCW signal generator (531) to input the input trigger from the starting and/or can be based on data acquisition interval is started.

Figure 6 shows a performance in the embodiment according to the measured results when one also etched.

The horizontal axis in Figure 6 represents range in metric units, a axis direction (azimuth) exhibits in metric units.

(A) of Figure 6 that has a bandwidth with network analyzer based radar Image recovery of 500MHz is result of radar system which, when applied as a comparison reference number. (B) of Figure 6 in the embodiment according to 500MHz herein shown Image recovery in the bandwidth of which, in the embodiment according to 300MHz (c) of Figure 6 herein shown Image recovery in the bandwidth of 2000. In the embodiment of Figure 6 (b) and (c) of in, data collection device is configured to selectively collecting data according to the trigger signal. Results of this test are abstract poriae of Figure 6 Image recovery performance such as table 1.

On the other hand, peak - sidelobe (peak-a sidelobe) on table has been calculated based on the ratio distance direction component, the measurement of the horn antenna (20 dBi or more), height 0. 9M, 1 moving distance. 2M, 30 cm of the target size, distance 3m, and cable 3m (cable for measuring filler by reflecting) performed conditions are disclosed.

Figure 7 shows a schematic diagram of the one in the embodiment according to FMCW radar also are disclosed.

Figure 7 shows a configuration to determine the function of Figure 3 also is formed between the timing also are disclosed. First, FMCW signal generator (710) is FMCW signal CLK3. For example, FMCW signal generator (710) is set according to the predetermined setting or user input signals generated by the bandwidth and/or modulation degree disapproval. For example, FMCW signal generator (710) is also configured to generate a signal in the form of a FMCW 4 described above in conjunction disapproval. In addition, as also described above in conjunction 5, FMCW signal generator (710) is the signal processing unit (720) number [...] tighteners signal disapproval. FMCW signal signal bandwidth in L - band may have disclosed. E.g., binarization frequency at least FMCW 1GHz, 2GHz hereinafter highest frequency may be disclosed.

Transmission unit (730) is FMCW local oscillator (740) by signal and of the transmission signals, via a transmit antenna transmits the same. Local oscillator (740) is configured to generate a signal with a frequency within a band X - can be. For example, transmission unit (730) of Figure 3 includes a mixer (313) antenna on disapproval.

Receiving unit (750) received by a receiver receives a received signal reflected from the object via antennas. In addition, receiver (750) received by a receiver local oscillator (740) from caused by signal outputted from the local oscillator (740) number signal components of the signal from the stationary substrate. For example, receiver (750) of Figure 3 includes a mixer (314) and a receiving antenna disapproval.

A signal processing unit (720) is FMCW signal receiving unit (750) in the received FMCW signal bit frequency number signal components from a stand-alone can. For example, signal processing unit (720) of Figure 3 includes a mixer (311) operating to configuration corresponding to disapproval. As bit using a frequency in the above-mentioned object distance and moving speed can be detected. The, signal processing unit (720) is detected based on a frequency of object distance and speed bit for detecting memory and/or processor can be further comprising.

In the embodiment described above substrate in, for facilitating descriptions to be omitted but, also shown in the FMCW radar 1 to 7 can be and to also are not controlled. For example, FMCW radar, power device, antenna, storage device, display, and/or water level can be a processor number. In addition, the aforementioned configurations general description of conventional antenna configurations in addition of FMCW radar is further included herein may be understand it will rain.

Figure 8 shows a number one in the embodiment according to FMCW radar flow of the method also are disclosed.

FMCW radar first, frequency modulation continuous wave (FMCW) signal CLK3 (S810). As above-mentioned, maximum frequency of at least 1 GHz frequency modulation continuous wave minimum frequency is 2 GHz hereinafter may be disclosed. In addition, as also described above in conjunction 4, FMCW signal with an output of 2 different bandwidth modulation signal generated by alternately disapproval. In addition, the time at which the rising edge or falling edge of each signal of alternating (edge) can be generated.

In addition, FMCW FMCW radar transmission signals and transmitting a predetermined signal by signal can be (S820). As described above, predetermined signal is 6. 2 GHz or more 10. 9 GHz hereinafter disk frequency can be.

FMCW radar receives a received signal reflected from the object and a plus terminal of the number if the predetermined signal can be a stand-alone (S830).

In addition, FMCW FMCW radar signal outputted from the bit frequency number FMCW signal component can be a stand-alone (S840). As above-mentioned, a dye 2 is configured on the bottom of the FMCW signal having different bandwidth, processing of the received signal corresponding to each time interval of signal processing can be divided into 2. In addition, 2 corresponding to each time interval of signal transmission between the receiver signals can be established corresponding to a time delay between the gap (gap). In addition, the aforementioned time interval start time of the rising edge or falling edge of the FMCW signal (edge) can be triggered.

For the aforementioned example of description is herein which, in the field of technical idea of person with skill in the art herein is provided herein or essential characteristics without changing other form may be understand easily outputted are disclosed. In the embodiment described above the exemplary non-limiting all sides are understood to which must substrate. For example, monolithic described embodiment in which the components may be dispersed, similarly dispersed described embodiment can be made of elements binding form.

Description herein are represented by said range of carry rather than claim, in which the meaning of and range as well as some general outline all changing or modified form uniform claim herein should range of interpreted.