Radar working channel acquisition system and method based on two-stage digital down-conversion

Abstract

The invention discloses a radar work channel acquisition system based on two-stage digital down conversion. A radio frequency direct sampling module obtains radar echo digital signals including n channels, and a digital orthogonal frequency mixing module obtains baseband digital signals including n channels; a half-band filter module obtains the baseband digital signals including n channels after the first stage of digital down conversion, and a data transmitting interface module obtains frame data; a radar parameter information module is used for providing parameter information of the current radar work channel; the corresponding frequency mixing control word is outputted of a channel mapping table module, and a data receiving interface module acquires the baseband digital signals including n channels after the first stage of digital down conversion and corresponding to the frame data; and the frequency-variable digital orthogonal frequency mixing module obtains the baseband digital signals of which the work channel is at zero frequency after digital orthogonal frequency mixing, and a multiphase extraction filter module obtains the baseband digital signals only including the work channel after the second stage of digital down conversion and then outputs the baseband digital signals to a data transmitting optical fiber module to be outputted.

Description

technical field [0001] The invention belongs to the field of radar signal processing, in particular to a radar working channel acquisition system and method based on two-stage digital down-conversion, which is suitable for real-time processing of radar echo analog signals with multiple working channels and multiple working channels respectively changing in real time. Collect the radar echo analog signal in the current working channel. Background technique [0002] The electromagnetic environment where the radar echo signal is located is extremely complex and changes in real time. Not only will it be subject to unintentional electromagnetic interference, but it will also be subject to intentional electromagnetic interference from the other party; many electromagnetic interferences have a great impact on the detection and processing of the radar echo signal , In severe cases, it may even cause the radar system to be in a state of paralysis. [0003] In this context, the radar...

AI Technical Summary

Problems solved by technology

[0005] At present, software radio is developing rapidly, and RF direct sampling is becoming more and more mainstream, but the sampling rate of RF direct sampling signal is very high, it is difficult to directly transmit to field programmable gate array (FPGA) for processing, and the bandwidth increases, the number of channels increases, and at the same time Doing multi-channel processing can cause resource overflow

Images