Microwave photon MIMO radar transmit-receive system

Abstract

The invention discloses a microwave photon MIMO radar transceiving system, belongs to the technical field of radar detection, and solves the problems that high-repetition-frequency optical frequency comb signals at a transmitting end are difficult to generate and dechirp intermediate-frequency signals at a receiving end are high in spurious quantity. A transmitting end generates two optical frequency comb signals with different repetition frequencies, one optical frequency comb signal serves as a local oscillation optical frequency comb signal, the other optical frequency comb signal serves as an optical carrier to be modulated by a baseband linear frequency modulation signal, the modulated optical frequency comb signal is divided into two paths, one path is beat with the local oscillation optical frequency comb signal to obtain M paths of transmitting waveforms of up-conversion, and the other path is beat with the local oscillation optical frequency comb signal to obtain M paths of transmitting waveforms of up-conversion; the other path is transmitted to a receiving subsystem as a reference optical signal; n receiving antennas of a receiving end receive radar echo signals, modulate the radar echo signals to optical frequency comb signals coupled by a transmitting subsystem, couple the radar echo signals with reference optical signals, and input the coupled radar echo signals into a photoelectric detector for beat frequency to obtain M * N dechirp intermediate frequency signals of the echo signals, and after analog-to-digital conversion, digital signal processing is carried out to obtain target information carried in the echo signal.

Description

technical field [0001] The invention belongs to the technical field of radar detection and relates to a microwave photon MIMO radar transceiver system. Background technique [0002] Due to its excellent detection performance in extreme environments and climatic conditions, radar is playing an increasingly important role in various fields such as military and civilian use. Multiple input multiple output (MIMO) radar is a new radar technology that has attracted much attention in recent years. Taking advantage of the advantages of antenna array space diversity and waveform diversity, MIMO radar has much better overall performance than single-input-single-output radar in terms of target detection, parameter estimation, imaging recognition, and anti-jamming. The traditional radar system is limited by electrical devices, and it is difficult to realize a MIMO radar system with large bandwidth and multi-channel simultaneous transmission and reception. Microwave photonic links have...

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Problems solved by technology

[0003] The purpose of the present invention is a microwave photon MIMO radar transceiver system to solve the problem that the optical frequency comb signal with high repetition frequency in the transmitting subsystem is difficult to generate and the spurious amount of the de-skewing intermediate frequency signal in the receiving subsystem is high

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