Asymmetric phase encoding ranging method applied to laser radar system

Abstract

The invention discloses an asymmetric phase encoding ranging method applied to a laser radar system. The laser radar system uses a typical phase encoding method and has high system hardware demands. The method provided by the invention comprises the steps that a laser in the laser radar system emits a laser signal with constant intensity; a modulator carries out intensity modulation according to a modulation signal sequence; the modulation signal sequence is an m sequence; a demodulator carries out intensity demodulation on an echo signal according to a demodulation signal sequence; a strobe mode is used to control cumulative detection time and output of a detector; the detector outputs cumulated signals to a signal processor; the signal output order of the detector shows a correlation peak position, so that the signal processor directly determines phase difference between a demodulation signal and the echo signal; and according to the phase difference, target distance is calculated. According to the invention, the asymmetric phase encoding method is used to measure the target distance; the sampling rate requirement of the system on the detector is reduced; and the calculation amount of signal processing is reduced.

Description

technical field [0001] The invention belongs to the field of laser radar, and in particular relates to an asymmetric phase encoding ranging method used in a laser radar system. Background technique [0002] The typical phase encoding method used in the laser radar system modulates the phase of the light wave carrier frequency signal according to the code source, and then transmits the phase encoded laser pulse signal. The laser signal reflected by the target is converged on the detector through the optical system, and the detector is converted into an echo The coded electrical pulse signal is sent to the signal processor together with the demodulation signal, and the correlation calculation is completed in the signal processor, and finally the distance parameter of the target is given. However, the detection of phase-encoded signals requires a high-speed detector to sample the signal quickly and the signal processor to process it quickly, which puts high demands on the syste...

AI Technical Summary

Problems solved by technology

However, the detection of phase-encoded signals requires a high-speed detector to sample the signal quickly and the signal processor to process it quickly, which puts high demands on the system hardware, especially when the system uses an array detector, the number of detector pixels is large , the total signal bandwidth of the array detector and signal processor is difficult to meet the requirements of real-time detection of the system

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