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Frequency modulation broadcast outer radiation source radar object detection method based on waveform cognition

An external radiation source radar and FM broadcasting technology, applied in the field of radar, can solve the problems of FM broadcasting signal bandwidth changes, distance ambiguity, and inability to accurately locate targets, etc.

Active Publication Date: 2018-10-19
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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  • Frequency modulation broadcast outer radiation source radar object detection method based on waveform cognition
  • Frequency modulation broadcast outer radiation source radar object detection method based on waveform cognition
  • Frequency modulation broadcast outer radiation source radar object detection method based on waveform cognition

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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 frequency modulation broadcast outer radiation source radar object detection method based on waveform cognition. The method comprises steps of first recovering direct wave signals of different broadcasting stations in a reference channel; performing radiation source waveform cognition processing in the reference channel and selecting a radiation source; using a self-adaption compensation method to suppress the direct wave and the multipath clutter for signals received by a receiving array in a monitoring channel; and performing distance Doppler cross correlation calculation on compensation residual signals and direct wave signals of the selected radiation source in the reference channel, to achieve screening of the frequency modulation broadcast signal for objectdetection. Therefore, the technical problem that the bandwidth of the partial frequency modulation broadcast signal is not suitable for the object 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 Applications(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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