Signal processor and signal processing method based on dual-channel frequency diversity technology

Abstract

The invention belongs to the field of primary radars in air traffic control, and particularly relates to a signal processor based on dual-channel frequency diversity technology and a signal processing method thereof. The signal processor provided by the invention comprises a transmitting waveform generation module, a dual-channel digital receiver module and a dual-channel signal processor module, wherein after being radiated by an antenna feed system at a signal output end of the transmitting waveform generation module, an echo signal enters a signal input end of the dual-channel digital receiver module, the signal output end of the dual-channel digital receiver module is connected with the signal input end of the dual-channel signal processor module, the dual-channel digital receiver module comprises a first receiving channel and a second receiving channel, the signal output ends of the first receiving channel and the second receiving channel are respectively connected with the signal input ends of a first FPGA chip and a second FPGA chip for receiving the echo signal and processing the signal in the first FPGA chip and the second FPGA chip, pulse concatenative synthesis of the signal is achieved in aDSP chip, and the signal processor provided by the invention is compact in structure, reasonable in design and high in data processing speed.

Description

technical field [0001] The invention belongs to the field of air traffic control primary radar, in particular to a signal processor based on dual-channel frequency diversity technology and a signal processing method thereof. Background technique [0002] In the current air traffic control primary radar field, single-channel frequency diversity technology is mostly used, that is, a narrow and wide pulse FM signal is transmitted in one transmission cycle, and the narrow pulse is used as a near-field blinding pulse. speed does not have the detection capability, when the Doppler frequency shift of the target f d When approaching the radar pulse repetition frequency, the blind speed effect occurs. AMTD cannot identify moving targets with integer times of repetition frequency in the frequency domain. It can only assist with pulse group repetition frequency conversion to increase the first blind speed and improve the blind speed response. When the width is fixed, the more the numb...

AI Technical Summary

Problems solved by technology

[0002] In the current air traffic control primary radar field, single-channel frequency diversity technology is mostly used, that is, a narrow and wide pulse FM signal is transmitted in one transmission cycle, and the narrow pulse is used as a near-field blinding pulse. speed does not have the detection capability, when the Doppler frequency shift of the target f d When approaching the radar pulse repetition frequency, the blind speed effect occurs. AMTD cannot identify moving targets with integer times of repetition frequency in the frequency domain. It can only assist with pulse group repetition frequency conversion to increase the first blind speed and improve the blind speed response. In the case of a fixed width, the more the number of pulse groups, the better the improvement of the first blind speed, but the reduction of the number of pulse accumulation in the pulse group is not conducive to signal coherent accumulation

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