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Dual-mode Adaptive Direct Wave and Clutter Suppression Method for Passive Bistatic System

A clutter suppression and adaptive filter technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of large residual clutter, slow algorithm convergence speed, and large calculation amount, and achieve a small amount of calculation and fast convergence Effect

Inactive Publication Date: 2017-06-09
HOHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The main problem with this algorithm is that the given method is difficult to reconcile in terms of calculation speed and convergence speed
Algorithms with faster convergence speed given in the existing literature, such as the sampling matrix inverse algorithm, are too computationally intensive to be implemented in actual systems; while algorithms with small computational complexity, such as the LMS algorithm, can be implemented in real time, but the algorithm The convergence speed is too slow, resulting in large residual clutter (sonar is reverberation), which affects signal detection

Method used

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  • Dual-mode Adaptive Direct Wave and Clutter Suppression Method for Passive Bistatic System
  • Dual-mode Adaptive Direct Wave and Clutter Suppression Method for Passive Bistatic System
  • Dual-mode Adaptive Direct Wave and Clutter Suppression Method for Passive Bistatic System

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0032] Such as figure 1 As shown, for the passive bistatic system, when the non-cooperative irradiation source (transmitting base) radiates the working waveform, the transmitted signal direct wave reaches the receiving base, and there are multiple reflected multipaths to be received. The target echo at point T will also be received by the receiving base at point R. The positions of the transmitting base and the receiving base are known to each other, one side RS of the triangle RST is known, the angle between RT and the two sides of RS can be measured, and the time difference between two bases of RT+TS-RS can be measured, so A system of equations can be formed to solve the position of the targ...

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Abstract

The present invention discloses the dual -mode self -adaptive direct -to -wave and miscellaneous suppression method of the passive dual -base system, including the following steps. Step 1, use an autocorrelation algorithm to calculate the coefficient vector of the adaptive filter.The average (LMS) algorithm is iterated to converge.In the process of direct waves and miscellaneous waves or bruises, the present invention uses a dual mode pair algorithm based on the combination of interconnected computing and adaptive LMS algorithm.The characteristics of small calculations.

Description

technical field [0001] The invention relates to an adaptive direct wave and clutter suppression method, in particular to a dual-mode self-adaptive direct wave and clutter suppression method for a passive bistatic system. Background technique [0002] When conventional active radar or sonar work at the same time, they interfere seriously with each other, and their positions are easily exposed. However, the two-base system does not send and receive at one place, and the receiving base can effectively avoid the enemy's reconnaissance and attack. Some bistatic systems use their own cooperative illumination sources to achieve target detection, while others use other non-cooperative emission sources. Such bistatic systems using non-cooperative sources of radiation are often referred to as passive dual multistatic systems. The radar or sonar system of this system is flexible in use and highly concealed, so it has a good application prospect. [0003] Passive bistatic systems usi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/292G01S7/35
CPCG01S7/292G01S7/352
Inventor 王峰蒋德富
Owner HOHAI UNIV