Method and system for eliminating same-frequency interference in phase coding

Abstract

The invention discloses a method and system for eliminating same-frequency interference in phase coding. The system comprises a transmitting system, a receiving system, a waveform generating unit with a phase shifting function, a digital intermediate-frequency receiver, a signal processing unit, a data acquisition machine and a terminal. The waveform generating unit with the phase shifting function generates transmission excitation signals with different phases each time and outputs the signals to the transmitting system; the signals are transmitted by an antenna to the space; the digital intermediate-frequency receiver receives an echo signal received by the antenna and a dominant wave signal coupled by a transmitter; a corresponding digital filter processes the signals to obtain zero-intermediate-frequency IQ signals and the zero-intermediate-frequency IQ signals are outputted to the signal processing unit; the signal processing unit receives the two paths of zero-intermediate-frequency IQ signals outputted by the digital intermediate frequency to carry out coherent processing and signal quality threshold processing and transmits the processed results to the data acquisition machine and the terminal for data acquisition. Therefore, a problem of same-frequency interference in weather radar detection can be solved.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a method and system for eliminating co-frequency interference by phase coding. Background technique [0002] With the rapid development of radar technology, more and more radars are deployed in both civilian and military fields, and radar networking is gradually applied. Therefore, the electromagnetic environment in which radars work tends to be more complex, and the problem of electromagnetic compatibility is becoming more and more prominent. One of the biggest problems is the same frequency interference, especially the interference between radars of the same type. The more the number of radars and the closer the distance, the greater the interference serious. In the field of weather radar detection, the same-frequency interference has seriously affected the echo data quality, so how to eliminate the same-frequency interference has become increasingly prominent. [0003]...

AI Technical Summary

Problems solved by technology

[0004] (1) The elimination of co-channel interference is not complete, and may affect the normal echo signal at the same time;

[0005] (2) The processing method mainly focuses on processing the output base data, which cannot fundamentally eliminate co-channel interference in principle

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