Joint Space-Frequency Adaptive Zeroing Algorithm Based on CCD Calculation

An adaptive, space-frequency technology, applied in the direction of instruments, measuring devices, satellite radio beacon positioning systems, etc., can solve the problems of not being able to cope with fast-changing non-stationary interference environments, unsatisfactory convergence stability and convergence speed, etc., to achieve Improve tolerance, improve convergence speed and robustness, and enhance the effect of inhibition

Active Publication Date: 2019-05-21
XIAN SPACE STAR TECH IND GRP
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Problems solved by technology

The calculation amount of the LMS algorithm is very small, but the algorithm belongs to the stochastic gradient category, which determines that its convergence stability and convergence speed are not ideal, and cannot cope with the non-stationary interference environment with rapidly changing parameters.

Method used

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  • Joint Space-Frequency Adaptive Zeroing Algorithm Based on CCD Calculation
  • Joint Space-Frequency Adaptive Zeroing Algorithm Based on CCD Calculation
  • Joint Space-Frequency Adaptive Zeroing Algorithm Based on CCD Calculation

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Embodiment Construction

[0051] The present invention will be described in detail below in combination with specific embodiments.

[0052] The invention relates to a calculation method for completing self-adaptive zeroing of a satellite navigation anti-jamming array antenna by using a complex coordinate axis descent algorithm (CCD) under the space-frequency joint processing (SFAP) framework, and has engineering implementability. The algorithm adopts the joint space-frequency processing (SFAP) framework to decompose the wideband signal into hundreds of narrowband sub-channels through frequency domain transformation. Since the bandwidth of each sub-channel is very narrow, the influence of channel mismatch can be greatly reduced. At the same time, the algorithm uses the complex coordinate descent algorithm (CCD) to calculate the optimal weight. Compared with the RLS algorithm, the calculation amount of the algorithm is reduced, and compared with the LMS algorithm, the convergence speed and stability of t...

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Abstract

The invention relates to a space-frequency combined self-adaptive zeroing algorithm based on CCD resolving. A present self-adaptive zeroing algorithm is high in the computational complexity, and improvements are needed in the convergence speed and stability. FFT is used to decompose each path of wideband signals into different sub-bands; a CCD algorithm is used to carry out self-adaptive zeroing on each sub-band signal; and IFFT is used to integrate cancellation errors of the subchannels, and original wideband signals and noise are recovered. According to the technical scheme of the invention, the tolerance for channel mismatching of a self-adaptive zeroing antenna is improved, the interference inhibition degree of the zeroing antenna is enhanced, and the method employing the CCD algorithm improves the convergence speed and stability of the optimal weight.

Description

technical field [0001] The invention belongs to the field of array signal processing technology and satellite navigation anti-jamming technology, and in particular relates to a space-frequency joint self-adaptive zeroing algorithm based on CCD calculation. Background technique [0002] The adaptive zeroing algorithm involves two core technologies: one is the overall framework of the algorithm. At present, the domestic anti-jamming field of satellite navigation is concentrated on the space-time joint processing algorithm (STAP). Its advantage is to increase the degree of freedom of array processing to cope with the decline of anti-interference performance caused by channel mismatch, but the degree of freedom of this calculation method is limited by the order of the STAP delay chain. The implementation complexity and resource consumption of the system under this calculation method will increase sharply with the increase of the STAP order. The second is the optimal coefficient...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 柳丰收
Owner XIAN SPACE STAR TECH IND GRP
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