Aiming at the problem that the laser coherent detection system is easy to be annihilated in the noise in the long-distance and complex environment, resulting in the system unable to extract effective information, In this paper, the pulse compression theory and matched filter principle are analyzed, and a target high-precision matched filter LFM system model suitable for laser coherent detection is proposed, by transmitting a linear frequency modulation signal, combined with the matched filter algorithm to process the echo signal, realizes the target distance solution under the condition of low signal-to-noise ratio. At the same time, the influence of FM bandwidth on the multi-target extractionability under different SNR is studied, and the FM bandwidth-ranging accuracy model is established. Compared with the ordinary windowing algorithm, by increasing the system FM bandwidth, it can be effective in extremely low signal-to-noise ratios. Extract multi-target distance values. The simulation results show that under the condition of -40 dB signal-to-noise ratio, setting the frequency modulation bandwidth to 4 GHz can effectively achieve multi-target detection, and the ranging accuracy can reach 4.5 mm.
As a classic radar signal processing method, pulse compression technology can effectively increase the measurement distance while ensuring the ranging resolution, so as to achieve long-distance high-precision measurement. Waveform modulation techniques commonly used for pulse compression include linear frequency modulation and phase code modulation. In this paper, we proposed a method of laser ranging technology based on pulse compression, briefly analyzing two waveform modulation techniques and exploring the relationship between modulation bandwidth and ranging accuracy based on the linear frequency modulation ranging model. The results indicated that the ranging accuracy fluctuated greatly when the modulation bandwidth was changed. The measurement error would be stable within 10mm when the modulation bandwidth was on the order of GHz. The method would be expected to provide a certain reference for the choice of laser modulation bandwidth in the field of long-distance high-precision laser measurement.
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