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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 7. Отображено 7.
08-08-2023 дата публикации

Ranging method based on laser radar signal deconvolution reconstruction

Номер: CN116559895A
Автор: LAI JIANCHENG, WU HAN, YAN WEI, WANG CHUNYONG, LI ZHENHUA, JI YUNJING, ZHAO YAN, WU ZHIXIANG
Принадлежит:

The invention discloses a ranging method based on laser radar signal deconvolution reconstruction, and belongs to the field of full-waveform laser radar ranging. The method comprises the following steps: collecting a transmitted waveform and a received echo waveform of a laser radar; estimating a standard deviation of the noise component; setting a proper noise threshold value, selecting a pulse echo range according to the noise threshold value, and windowing to obtain a laser radar echo; filtering and denoising the echo signal; performing waveform deconvolution reconstruction on the echoes to obtain impulse response; and calculating a target distance by taking a peak value of the impulse response as an echo arrival time. According to the method, through waveform deconvolution reconstruction, the influence of the waveform of the laser radar emission wave is eliminated, the impulse response containing the target attribute is reserved, and compared with the prior art, the method has higher ...

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Номер записи: 1
30-06-2023 дата публикации

Waveform characteristic parameter calculation method of full-waveform laser radar

Номер: CN116359878A
Автор: WANG CHUNYONG, ZHOU YUNDONG, YAN WEI, JI YUNJING, LAI JIANCHENG, LI ZHENHUA
Принадлежит:

The invention discloses a waveform characteristic parameter calculation method of a full-waveform laser radar. The method is suitable for the full-waveform laser radar adopting a monopulse type flight time ranging method. According to the method, discrete waveform data containing echo pulses are operated from a peak value, a scheme for optimizing on-chip implementation is adopted to calculate characteristic parameters of waveform arrival time, in order to simplify operation steps, an initial time is set to be 0, a real initial time is added to a final result, and the initial time is set to be 0; and after the current iteration result is obtained, adding waveform data at adjacent moments on the left and right sides for next iteration, and stopping iteration when the value of the newly added waveform data is smaller than 2/3 of the peak value and the difference value between the result at the arrival moment and the last iteration is smaller than the preset minimum precision, or the value ...

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Номер записи: 2
11-08-2023 дата публикации

Double-scale sea surface laser radar back scattering calculation method based on Elfouhaill sea spectrum

Номер: CN116577805A
Автор: LI ZHENHUA, HOU YONGHUA, LAI JIANCHENG, YAN WEI, WANG CHUNYONG, JI YUNJING, ZHAO YAN, WU ZHIXIANG
Принадлежит:

The invention discloses a sea spectrum-based dual-scale sea surface laser radar back scattering calculation method. The method comprises the steps of selecting a sea surface power spectrum model capable of better describing a sea surface dual-scale structure and a sea surface mean square slope; calculating the cut-off wave number of the sea surface gravity wave and the tension wave; calculating the mean square slope of the sea surface gravity wave and the tension wave; adopting a dual-scale method and a Kirchhoff approximation method to calculate a laser radar backscattering coefficient of the wind-driven rough sea surface; and considering incident shielding and scattering shielding of the sea surface element, calculating a shielding function of back scattering of the two-dimensional rough surface, and correcting a scattering coefficient. The sea spectrum capable of well reflecting the sea surface double-scale structure is selected, the accurate cut-off wave number and the shielding function ...

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Номер записи: 3
09-06-2023 дата публикации

Gain self-adaptive rigid body attitude measurement recorder with magnetoresistive sensor

Номер: CN116242335A
Автор: WANG CHUNYONG, LV ZHAOLUN, YAN WEI, JI YUNJING
Принадлежит:

The invention discloses a gain adaptive magnetoresistive sensor rigid body attitude measurement recorder, which comprises a magnetoresistive sensor, an operational amplifier circuit, a processor, a memory and a power supply, and is characterized in that the magnetoresistive sensor is used for receiving a magnetic field signal of rigid body real-time motion, converting the magnetic field signal into a level quantity and outputting the level quantity to the operational amplifier circuit; the operational amplifier circuit comprises an operational amplifier and a digital potentiometer; the digital potentiometer is used for changing resistance in real time to adapt to different magnetic field environments; the operational amplification circuit is in communication connection with the processor, the processor is used for performing A/D conversion on signals after operational amplification, the memory is used for storing data processed by the processor, and the power supply supplies power to the ...

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Номер записи: 4
23-06-2023 дата публикации

Fast self-adaptive laser ranging system and method based on silicon photomultiplier

Номер: CN116299508A
Автор: WANG CHUNYONG, JIANG WENZHUO, YAN WEI, WU ZHIXIANG, JI YUNJING, LAI JIANCHENG, LI ZHENHUA
Принадлежит:

The invention discloses a fast self-adaptive laser ranging system and method based on a silicon photomultiplier, a data processing module starts a time sequence control circuit, a pulse laser transmitter is driven to generate laser, the laser is shaped through a transmitting lens assembly and irradiated to a measured object, and a time-to-digital conversion module starts timing synchronously; echo light signals are received by the receiving lens assembly and are uniformly distributed on the receiving surface of the silicon photomultiplier through the diaphragm for photoelectric conversion, and then the signals are amplified through the amplifying circuit; the signal processing module measures the background light intensity in real time, outputs the background light intensity as a threshold voltage to the comparator, performs shaping and discrimination through the comparator to obtain an effective signal, transmits the effective signal to the time-to-digital conversion module and ends timing ...

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Номер записи: 5
30-06-2023 дата публикации

Online speed monitoring device and method based on framing speckle imaging

Номер: CN116359546A
Автор: SONG YANG, LYU XIAOYONG, LAI JIANCHENG, JI YUNJING, LI ZHENHUA
Принадлежит:

The invention discloses an on-line speed monitoring device and method based on framing speckle imaging, the device is mainly composed of a laser, a two-frame camera and an upper computer, laser irradiates a to-be-measured target, and the two-frame camera collects a speckle image formed by reflection of the surface of the to-be-measured target; the two-frame camera is used for collecting speckle images, light is split through the relay light path and the beam splitter prism, and two frames of speckle images are collected by the camera at two adjacent moments; the two-frame camera transmits the speckle image to the upper computer, the displacement of the to-be-measured target is obtained through an image cross-correlation algorithm, and then the movement speed of the to-be-measured target is obtained. The motion speed of the to-be-measured target is monitored, an expensive double-frame high-speed camera does not need to be adopted, the to-be-measured target does not need to be marked, and ...

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Номер записи: 6
11-08-2023 дата публикации

Method for reconstructing waveform distortion of output signal of photon counting laser radar

Номер: CN116577755A
Автор: ZHAO YAN, LI JIEKAI, LAI JIANCHENG, YAN WEI, WANG CHUNYONG, LI ZHENHUA, JI YUNJING, WU ZHIXIANG
Принадлежит:

The invention provides a reconstruction method for photon counting laser radar output signal waveform distortion, and belongs to the field of photon counting laser radar echo signal analysis. The method comprises the following steps: determining a time correlation photon counting statistical histogram of the photon counting laser radar; determining a theoretical model of photon counting laser radar echo signals; converting the time correlation photon counting statistical histogram into a photon detection probability oscillogram; carrying out noise reduction processing on the waveform; calculating an initial parameter value of the photon counting laser radar; substituting the initial parameter value and the time-photon detection probability curve into an optimization algorithm combined theoretical model to calculate an optimal solution; and substituting the optimal solution into a detection model without dead time to obtain a reconstructed waveform. According to the method, the correctness ...

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Номер записи: 7