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Distributed radar main lobe interference suppression method based on cascaded LMS filter

A main lobe interference and filter technology, applied in the field of radar main lobe interference suppression processing, can solve the problems of slow change, multi-frame accumulation processing performance loss, etc.

Pending Publication Date: 2022-01-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Claims
  • Application Information

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Problems solved by technology

But on the other hand, because the interference signal may have slow changes in parameters such as Doppler and power in a slow time, neither the spatial domain nor the time domain adaptive filtering processing can effectively solve this problem, resulting in the loss of multi-frame accumulation processing performance.

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  • Distributed radar main lobe interference suppression method based on cascaded LMS filter
  • Distributed radar main lobe interference suppression method based on cascaded LMS filter
  • Distributed radar main lobe interference suppression method based on cascaded LMS filter

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Embodiment Construction

[0062] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0063] A typical distributed radar system detection scenario is as follows: figure 1 shown. The distributed radar system is composed of a main radar and a plurality of auxiliary radars sparsely and scatteredly arranged around the main radar, wherein a plurality of auxiliary radars are sparsely arranged around the main radar to form a sparse coherent receiving array, and the sparse coherent receiving The aperture of the array is larger than the aperture of the main radar. The sparse and dispersed arrangement of the plurality of auxiliary radars means that two adjacent auxiliary radars are spatially independent, and the distance between the antennas on it is ten to a hundred times the half-wavelength. The distance between the main radar and each auxiliary radar Time-time-frequency and time-sequence synchronization devices are connected to ensure the coheren...

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Abstract

The invention discloses a distributed radar main lobe interference suppression method based on a cascaded LMS filter. The method can effectively and stably suppress main radar echo interference through two-stage filter cascading. The method comprises the following steps of: firstly, receiving a target and an interference signal by using a main radar, and receiving the interference signal by using a large-aperture coherent array with an extremely narrow beam formed by sparse deployment of a plurality of auxiliary radars; and then subjecting main radar echoes to interference cancellation (Wiener filtering) processing by adopting a fast time-slow time cascade LMS filter and by taking main radar and large-aperture coherent receiving array signals as input. Specifically, the fast-time LMS filter can realize fast-time stable tracking and filtering of interference parameters, the slow-time LMS filter can realize slow-time stable tracking and filtering of the interference parameters, and the cascade connection of the two-stage filters can realize effective and steady suppression of main radar echo interference.

Description

technical field [0001] The invention relates to the field of radar main lobe interference suppression processing, in particular to a distributed radar main lobe interference suppression method based on a cascaded LMS filter. Background technique [0002] The electromagnetic environment of the modern battlefield is increasingly complex, and electromagnetic interference has become an important bottleneck problem restricting the working efficiency of radar. As a typical interference pattern, the main lobe interference is modulated by the gain of the radar antenna, the interference energy is greater, and the interference effect is more obvious. The traditional sidelobe interference suppression processing method cannot effectively suppress it. [0003] Aiming at the problem of radar main lobe interference suppression, the traditional airspace processing method is to form the zero point of the pattern in the interference direction, but limited by the aperture constraint of the sin...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 常少强隋欣然郑梓铭刘泉华曾涛龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY