Outer transmitter-based radar system based on multi-FM broadcasting and signal processing method

Abstract

The invention belongs to the field of outer transmitter-based radars, and relates to an outer transmitter-based radar system based on multi-FM broadcasting and a detection method. The outer transmitter-based radar system based on the multi-FM broadcasting comprises receiving antennas connected in sequence, a simulation case containing a signal simulating and receiving module, a CPCI case containing a signal collecting and processing module, at least one disk array case containing a signal storage module, a switch and a signal processing machine carrying out signal processing. A multi-FM broadcasting irradiation source adopted by the system has multi-frequency, multi-station and multi-polarization characteristics, a multi-polarization mode is adopted by the receiving antennas, a radio frequency direct sampling structure is adopted for simulating and receiving, a radio frequency band-pass sampling and digital downconversion scheme is adopted by data collection, a high-speed disk array is adopted for data storing, the signal processing machine completes clutter rejection, mutual fuzzy function operation, peak value detection, constant false alarm rate detection, locating and tracking, data fusion and other operations, and finally object distance, speed and azimuth information is output. The outer transmitter-based radar system based on the multi-FM broadcasting and the detection method have the advantages of being free of electromagnetic pollution, resistant to stealth, and high in detection stability and tracking continuity.

Description

technical field [0001] The invention relates to the field of external radiation source radar, in particular to a system and a signal processing method for detecting targets by using multiple FM broadcasting radiation sources. Background technique [0002] External radiation source radar (also known as passive radar) is a dual / multistatic radar system that uses electromagnetic signals emitted by a third party to detect targets. The radar itself does not emit energy, but passively receives non-coordinated signals reflected by targets. The electromagnetic signal of the type radiation source is used to locate and track the target. Commonly used commercial sources of radiation include analog broadcasting (FM), digital broadcasting (digital amplitude modulation broadcasting DRM, digital audio broadcasting DAB, digital TV broadcasting DVB-T, China Mobile multimedia broadcasting CMMB and digital TV terrestrial broadcasting DTMB), wireless network WIFI, GPS navigation satellites etc...

AI Technical Summary

Problems solved by technology

The content of the broadcast signal is composed of speech, music and silent segments, and the amplitude of the modulated signal changes significantly, resulting in constant changes in the effective bandwidth of the broadcast signal, and poor stability of the radar.

[0006] 2. The signal bandwidth is small, and the radar range resolution is insufficient

FM signals have lower range resolution compared to digital signals

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