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Radar interference identification method with distance and speed simultaneous pull-off

A technology of interference identification and speed, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., can solve problems such as failure, too ideal model, sensitivity to noise, etc., and achieves a small amount of calculation and stable spectral characteristics. , easy to achieve effect

Active Publication Date: 2016-08-17
XIDIAN UNIV
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Problems solved by technology

[0004] The premise of combating active spoofing jamming signals is that the radar can correctly identify jamming signals. Existing methods can identify active spoofing jamming signals in the radar receiving gate in the frequency domain, time-frequency domain, high-order spectral domain or polarization domain. Among them, some scholars identify the target signal and interference signal in the radar receiving gate by extracting the amplitude statistical feature difference method between the target signal and the interference signal, but this method is sensitive to noise and only available under the condition of high signal-to-noise ratio. Good target signal or interference signal recognition rate; secondly, the model established by this method is too ideal, so that the method will fail when there are both target signals and interference signals in the radar receiving gate

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  • Radar interference identification method with distance and speed simultaneous pull-off
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  • Radar interference identification method with distance and speed simultaneous pull-off

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[0026] refer to figure 1 , is the realization flow chart of the method of the present invention; the technical principle of the method of the present invention:

[0027] The jammer based on digital radio frequency storage technology realizes the joint deception of radar in distance and speed by modulating the intercepted radar signal with time delay and Doppler frequency respectively, that is, generating range gate drag and velocity gate drag ( RangeGate Pull Off-Velocity Gate Pull Off, RGPO-VGPO) jamming signal; in fact, when the jammer based on digital radio frequency storage technology performs digital phase quantization sampling and delay quantization modulation on the intercepted radar signal, due to the current technology The limited level causes the frequency of the modulated RGPO-VGPO interference signal to be distorted. The modulated and synthesized RGPO-VGPO interference signal spectrum contains a series of harmonic spectra, while for the broadband RGPO-VGPO interfer...

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Abstract

The present invention discloses a radar interference identification method with distance and speed simultaneous pull-off. The method comprises a step of establishing a radar interference signal model with interferometer transmitting distance and speed simultaneous pull-off, wherein, a target carries the interferometer, and the real target echo signal received by a radar is obtained; a step of setting an interferometer input signal, receiving a wideband linear modulation signal by the interferometer, calculating the distance-speed simultaneous pull-off interference signal outputted by the interferometer, and calculating a distance-speed simultaneous pull-off interference signal with phase quantization, a step of setting the echo signal received by a target and an echo signal received by the radar and obtaining real target echo baseband signal or a distance-speed simultaneous pull-off baseband interference signal with phase quantization, and a step of orderly setting a characteristic interference signal error angle and the category of the echo baseband signal received by the radar and thus identifying the interference signal or a target signal.

Description

technical field [0001] The invention belongs to the technical field of radar anti-jamming, in particular to a radar-jamming identification method with distance and speed synchronous towing, which is suitable for wide-band radar to oppose active deception jamming signals. Background technique [0002] Range Gate Pull Off (RGPO) and Velocity Gate Pull Off (VGPO) based on Digital Radio Frequency Memory (DRFM) technology have the same Strong coherence, the resulting jamming signal obtains a considerable gain at the radar receiving end, making it difficult for the radar to distinguish between the target signal and the jamming signal, and the range gate-velocity gate with range-velocity joint deception ability is synchronously dragged. The RGPO-VGPO method can not only interfere with radars with only speed measurement capability or ranging capability, but also effectively interfere with radars with range-speed detection capability at the same time. [0003] Because the pulse comp...

Claims

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Application Information

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IPC IPC(8): G01S7/36G01S13/58
CPCG01S7/36G01S13/58
Inventor 李明卢云龙王泽玉陈洪猛
Owner XIDIAN UNIV
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