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Waveform cognition-based target detection method for FM broadcast external radiation source radar

An external radiation source radar and target detection technology, which is applied in the field of FM broadcast external radiation source radar target detection based on waveform cognition, can solve problems such as distance ambiguity, FM broadcast signal bandwidth changes, and the inability to accurately locate targets, etc., to achieve accurate positioning Effect

Active Publication Date: 2021-09-28
HOHAI UNIV
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Problems solved by technology

However, the bandwidth of the FM radio signal changes with the content of the signal program
Music programs have a wide bandwidth, which is suitable for target detection; while speech signals with a narrow bandwidth have the problem of distance ambiguity when detecting targets, and cannot accurately locate the target

Method used

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  • Waveform cognition-based target detection method for FM broadcast external radiation source radar
  • Waveform cognition-based target detection method for FM broadcast external radiation source radar
  • Waveform cognition-based target detection method for FM broadcast external radiation source radar

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Embodiment Construction

[0077] The technical solutions of the present invention will be further elaborated below according to the drawings and in conjunction with the embodiments.

[0078] The present invention adopts the following technical scheme, a FM broadcast external radiation source radar target detection method based on waveform cognition, the external radiation source radar system includes a reference channel for realizing direct wave recovery and a monitoring channel for realizing direct wave suppression and target detection, transmitting The waveform recognition of the station station (illumination source) is realized in the direct wave recovery channel. After receiving the signal, the receiving array is divided into two channels to process the signal. The specific steps are as follows:

[0079] 1) Recover the direct wave signals of different transmitting stations in the reference channel, which is realized by digital beamforming. The beam output formula is as follows:

[0080]

[0081]...

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Abstract

The invention discloses a radar target detection method for FM radio radiation sources based on waveform cognition. Firstly, the direct wave signals of different stations are restored in the reference channel; the illumination source waveform cognitive processing is performed in the reference channel, and the illumination source is selected; In the monitoring channel, the adaptive cancellation method is used to suppress the direct wave and multipath clutter for the signal received by the receiving array; the distance Doppler cross-correlation calculation is performed on the residual signal of the cancellation and the direct wave signal of the illumination source selected in the reference channel , realize the screening of FM broadcast signals for target detection, and solve the technical problem that the bandwidth of some FM broadcast signals is not suitable for target detection.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a radar target detection method for FM broadcast external radiation sources based on waveform cognition. Background technique [0002] The external radiation source radar system has attracted the attention of various countries because of its stealth, anti-anti-radiation destruction, anti-low-altitude penetration and anti-electronic interference. The system radar can choose a variety of third-party illumination sources, such as FM radio (FM), digital TV, analog TV, mobile phone signals, global satellite navigation and positioning signals, etc. In view of the advantages of FM broadcast as a civil signal, such as good pulse compression performance, high transmission power and strong vitality, FM broadcast external radiation source radar is favored by researchers. [0003] Compared with the traditional single-transmission and single-reception FM broadcast external radiatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 王峰周易龚道银陈哲
Owner HOHAI UNIV
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