Pre-modulated-AIC-based millimeter wave radar imaging method
A millimeter wave radar and imaging method technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, instruments, etc., can solve the problems of low interception rate, high complexity and cost of millimeter wave radar systems, and improve imaging. Resolution, overcoming the difficulty of high-resolution imaging of millimeter-wave radar echo distance, and reducing the effect of adverse effects
Inactive Publication Date: 2019-05-21
昆山煜壶信息技术有限公司
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[0004] Compared with radars in the common microwave band, millimeter-wave radars have powerful capabilities due to their high distance resolution, large signal bandwidth, strong penetrating power, low interception rate, strong anti-interference, and superior anti-stealth and plasma-penetrating capabilities. However, due to its own characteristics, it brings great challenges to system requirements and signal processing.
[0005] Moreover, the millimeter-wave radar system and imaging method used at this stage does not involve how to process the data sampling, storage and transmission of the large-bandwidth millimeter-wave radar signal, and the complexity and cost of the millimeter-wave radar system are extremely high. of
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[0039] see figure 1 , the present embodiment shows a millimeter-wave radar imaging method based on pre-modulated AIC, comprising the following steps:
[0040] 1) The millimeter-wave radar is used to transmit signals, and the millimeter-wave radar is used to receive the echo signal reflected by the target scattering point, and the echo signal is coherently demodulated to obtain the baseband chirp echo signal x(t), where t represents a discrete time variable .
[0041] 2) Using a pre-modulated analog information converter, the baseband chirp echo signal x(t) is down-sampled to obtain the down-sampled observation signal. The specific steps are:
[0042] 2-1) Combine the baseband chirp echo signal x(t) with the set random modulation sequence signal p c (t) are multiplied to obtain the randomly demodulated millimeter wave echo signal x'(t); the random modulation sequence signal p c (t) is obtained according to the following formula:
[0043]
[0044] 2-2) performing low-pass...
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The invention relates to pre-modulated-AIC-based millimeter wave radar imaging method. The method comprises: transmitting a signal externally by using a millimeter wave radar, receiving an echo signalreflected by a target scattering point by using a millimeter wave radar, carrying out coherent demodulation on the echo signal to obtain a baseband linear frequency-modulation echo signal x(t) with the t expressing a discrete time variable; with a premodulated analog information converter, carrying out downsample processing on the baseband linear frequency-modulation echo signal x(t) to obtain adownsample observation signal; carrying out sparse reconstruction on the downsampled observation signal to obtain a distance image of the target scattering point. According to the invention, on the basis of the pre-modulated AIC downsampling structure, the restriction of the traditional Nyquist sampling is eliminated; the low-speed sampling of the wideband signal is realized; the high-rate signalprocessing in the conventional pulse compression is saved; problems of collection, storage and transmission and the like of the ultra large data in the millimeter wave radar are solved; and the complexity and cost of the system are reduced.
Description
technical field [0001] The present invention relates to the technical field of radar imaging, specifically, it shows a method of millimeter-wave radar imaging based on pre-modulated AIC. Background technique [0002] Millimeter wave is an electromagnetic wave between millimeter wave and infrared light (frequency is 0.1THz to 10THz), and it is also the last frequency band that humans have not yet fully recognized and utilized. [0003] Millimeter wave combines the advantages of microwave, millimeter wave and infrared light, and is especially suitable for the characteristics of moderate beam width, wide system bandwidth and large Doppler frequency shift, and is more suitable for extremely large signal bandwidth and extremely narrow antenna beam. Realization is more conducive to high-resolution inverse synthetic aperture radar imaging. [0004] Compared with radars in the common microwave band, millimeter-wave radars have powerful capabilities due to their high distance resolu...
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IPC IPC(8): G01S13/90G01S7/41
Inventor 孙耀明王敏
Owner 昆山煜壶信息技术有限公司