GSM external radiation radar signal processing method based on digital modulation and demodulation

Abstract

The invention discloses a GSM external radiation radar signal processing method based on digital modulation and demodulation. The GSM external radiation radar signal processing method mainly solves reference signal purification problems of an external radiation source system based on digital modulation and demodulation. The GSM external radiation radar signal processing method comprises the steps that a signal of a reference channel is modulated and demodulated so as to obtain a pure emission signal; the local regenerated pure emission signal is used for conducting clutter cancellation, distance-Doppler detection is conducted, and detection and position information extraction of a moving object are finished. The core of the GSM external radiation radar signal processing method is purification conducted on the reference signal in the reference channel, multi-path and noise influences from the reference signal are removed, the correlation of a target echo signal in an echo channel is improved, and detection power of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and mainly relates to the comprehensive utilization of the modulation and demodulation technology of the global system for mobile communication (GSM) signal and the radar signal processing technology, specifically a digital modulation and demodulation technology For signal processing methods, improve the detection performance of passive radar. The simulation test verification can be carried out on the mathematical simulation software MATLAB. Background technique [0002] The external radiation source radar system is a dual (multi-base) radar system with non-cooperative emission and separate transceivers. By receiving the direct wave from the irradiation source and the echo reflected by the target, it can realize the detection of the target through relevant external radiation technology processing. detection and tracking. The external radiation radar system adopts widely distribu...

AI Technical Summary

Problems solved by technology

However, these passive radar systems for GSM signals do not purify the reference signal in the reference channel. In order to improve the signal-to-noise ratio of the reference signal, the receiver needs to be placed near the transmitting base station, and the signal-to-noise ratio of the reference signal is limited. The impact detection distance is relatively short. The GSM passive radar system of Nanyang Technological University in Singapore can detect ships at sea at a distance of 1 km, and the passive radar system of Ulrich Nickel’s GSM signal in Germany can detect moving cars at a distance of 2.3 km.

Images