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Efficient cascading space-time adaptive processing method based on passive detection

A technology of passive detection and processing methods, applied in radio wave measurement systems, instruments, etc., can solve the problems of clutter Doppler bandwidth not widening, STAP processor has a large amount of calculation, and engineering real-time processing is difficult

Inactive Publication Date: 2014-04-30
HOHAI UNIV
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Problems solved by technology

However, as a statistical adaptive processing algorithm, STAP's performance can only be fully exerted when the clutter satisfies the independent and identical distribution (IID) condition.
In addition, the optimal STAP processor has a huge amount of computation, so real-time engineering processing is quite difficult
[0003] STAP clutter suppression is proposed based on the airborne radar aircraft motion model. For passive detection systems, the clutter Doppler frequency is caused by clutter fluctuations. Although clutter scattering units with different spatial distributions correspond to different multiple Doppler frequency, but because the radial velocity corresponding to the clutter fluctuation is much smaller than the movement speed of the carrier aircraft, the Doppler bandwidth of the clutter is basically not widened, and it is mainly concentrated near the center frequency of the main clutter

Method used

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  • Efficient cascading space-time adaptive processing method based on passive detection
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  • Efficient cascading space-time adaptive processing method based on passive detection

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Embodiment Construction

[0045] The technical solution of the present invention will be described in detail below with reference to the drawings and embodiments.

[0046] figure 1 It is a schematic diagram of two-dimensional filtering of airborne radar STAP. After STAP received data is processed by range pulse compression, according to Bernoulli hypothesis testing theory, the received signal of a certain range gate can be represented by MK×1 dimensional column vector (space-time snapshot), where M is the number of receiving array elements, K is the number of time-domain pulses in one CPI, namely

[0047]

[0048] In the formula, α and s are the amplitude of the moving target and the steering vector respectively, and s can be expressed as

[0049] s = s t ⊗ s s - - - ( 2 )

[0050] In the formula,

[0051]

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Abstract

The invention discloses an efficient cascading space-time adaptive processing method based on passive detection. Firstly, coherent integration is carried out on time domain pulses; secondly, weight of adaptive digital beam forming (ADBF) of a beam domain is calculated through high-frequency Doppler unit data only comprising interference information; thirdly, ADBF interference restraining is carried out on each Doppler unit; lastly, clutter is restrained through an adaptive double-delay canceller, and coherent integration is carried out on output signals of the self-adaptive double-delay canceller through weighting fast Fourier transform (FFT). By means of the efficient cascading space-time adaptive processing method, interference and clutter can be effectively restrained, the moving-target detection performance can be improved, and engineering implementation is easy because of small operand.

Description

technical field [0001] The present invention relates to passive detection interference and clutter simultaneous suppression technology, and studies a high-efficiency space-time adaptive processing (STAP, Space -Time Adaptive Processing) method Background technique [0002] The electromagnetic environment of modern warfare is extremely complex, and suppressive interference can greatly reduce the detection performance of passive detection systems. In addition, ground fluctuations and clutter will also reduce the detection performance of passive detection systems for slow-moving targets. Therefore, the ability to adaptively suppress interference and clutter at the same time is the core means to improve the performance of passive detection systems, and space-time adaptive processing (STAP) can effectively suppress clutter and interference when jointly designing adaptive filters in a two-dimensional plane. However, as a statistical adaptive processing algorithm, STAP's performan...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G01S7/41
CPCG01S7/02G01S7/2813G01S7/36G01S7/41
Inventor 沈明威于佳杨柳
Owner HOHAI UNIV
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