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FDA-MIMO radar fuzzy clutter suppression method based on auxiliary pulses

An auxiliary pulse and clutter suppression technology, applied in the field of radar, can solve the problems of clutter suppression performance loss and limited suppression ability, and achieve the effect of improving influence and stability.

Active Publication Date: 2019-01-15
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

Among them, the fuzzy clutter suppression method based on the emission space is affected by the degree of freedom of the fuzzy clutter space, and the suppression ability is limited
The pitch-dimensional-FDA method can suppress range ambiguity clutter, but the filter designed by this method is independent of data and is sensitive to array errors. When there are array errors, there is a relatively large loss in clutter suppression performance

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  • FDA-MIMO radar fuzzy clutter suppression method based on auxiliary pulses
  • FDA-MIMO radar fuzzy clutter suppression method based on auxiliary pulses
  • FDA-MIMO radar fuzzy clutter suppression method based on auxiliary pulses

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Embodiment Construction

[0040] The implementation and effect of the present invention will be further described in detail below.

[0041]The application scenario of the present invention is: the present invention can be applied to the suppression of range ambiguity clutter in the case of non-frontal side view. The FDA-MIMO radar range ambiguity clutter suppression method based on the auxiliary multi-waveform pulse overcomes the deficiency of the existing methods in suppressing the range ambiguity clutter, and can significantly improve the estimation accuracy of the covariance matrix of the range ambiguity clutter and improve the output of the target signal-to-noise ratio and is robust to array errors. like figure 1 As shown, the implementation steps are as follows:

[0042] Step 1: Select an auxiliary pulse waveform with a cross-correlation lower than -70db with the main waveform pulse. Assume that the signal form corresponding to the main pulse waveform emitted by the mth array element is Among...

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Abstract

The invention discloses an FDA-MIMO radar distance fuzzy clutter suppression method based on auxiliary multi-waveform pulses. The method comprises the steps that 1, a waveform having the ultralow cross-correlation property with a main transmitted waveform is selected; 2, the auxiliary pulses are transmitted within coherent integration time according to system parameters and designed OFDM signals;3, a fuzzy clutter covariance matrix of a main observation interval is obtained by utilizing the auxiliary pulses; 4, distance fuzzy clutters in the main observation interval are suppressed based on the minimum variance criterion; and 5, remaining clutters are suppressed according to a traditional non-side-looking mode. The non-self-adaptivity defect of fixed weighting of a traditional FDA-MIMO method is overcome by designing a matched filter through the auxiliary pulses due to the consistency of the auxiliary pulses and the distance fuzzy clutters of the main observation interval, and the stability of array errors is improved.

Description

technical field [0001] The invention belongs to the technical field of radar, and relates to an FDA-MIMO radar fuzzy clutter suppression method based on auxiliary pulses, which can be used for complex clutter suppression in spaceborne / airborne non-front-view large scenes. Background technique [0002] When spaceborne radar looks down, affected by the large width of the observation scene and the high pulse repetition frequency, there is very serious range ambiguity. The clutter suppression performance of space-time signal processing will be affected by the range ambiguity clutter. Clutter is suppressed. [0003] One is a system method based on Pulse Repetition Frequency (PRF) optimization, which can reduce the detection blind zone of STAP (Space-time adaptive processing), but this type of method cannot essentially suppress distance ambiguity and noise. At the same time, multiple sets of CPI (Coherent Processing Interval) echoes with different PRFs are required to achieve tar...

Claims

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Application Information

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IPC IPC(8): G01S7/02G01S7/36
CPCG01S7/023G01S7/36
Inventor 朱江段崇棣王伟伟范一飞李渝杨晓超黎薇萍
Owner XIAN INSTITUE OF SPACE RADIO TECH
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