Phase-coded imaging lidar based on microwave photon signal processing

Abstract

The invention discloses a phase encoding laser imaging radar based on microwave photonic signal processing. The detection of a phase encoding signal requires rapid signal sampling of a high speed detector. The laser signal sampling speed of an array detector applied to a laser imaging radar is limited by a production process, which cannot meet the signal sampling speed requirement of a large-array phase encoding laser radar. The resolution of phase encoding laser imaging radar ranging is low. According to the invention, an optical device is used; a microwave photonic signal processing method is used to complete the convolution process of an echo signal and a reference signal; the convolution process comprises the product process of the echo signal and the reference signal in a laser modulator / demodulator and the accumulation process of signal product in an accumulation type detector; the limits of the sampling rate of the detector and total signal bandwidth on range resolution is broken; the requirement on the sampling rate of the detector is reduced; and the range resolution and the signal processing rate of a laser radar system are improved.

Description

technical field [0001] The invention belongs to the field of laser radar, and in particular relates to a phase-coded laser imaging radar based on microwave photon signal processing. Background technique [0002] The phase-coded laser radar performs phase modulation on the light wave carrier frequency signal according to the code source, and then transmits the phase-coded laser pulse signal. The laser pulse coded signal reflected by the target is received by the receiver after transmission delay and converted into an echo coded electrical signal by the detector. The phase coded echo signal and the phase coded signal emitted by the laser are sent to the computer through data collection to complete the correlation calculation, and then the signal Processing, and finally give the distance parameter of the target. However, the detection of phase-encoded signals requires high-speed detectors to quickly sample the signals. The sampling speed of laser signal array detectors used in...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low sampling rate of the existing phase-coded laser imaging radar and the limitation of the total signal bandwidth of the signal processor, resulting in low ranging resolution. A phase-coded laser imaging radar based on microwave photon signal processing is proposed to break through The limitation of the detector sampling rate and the total bandwidth of the signal on the distance resolution reduces the system's requirements for the detector sampling rate, reduces the calculation amount of signal processing, reduces the system hardware requirements, and improves the distance resolution and signal processing rate of the laser radar system.

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