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Airspace real-time adaptive anti-jamming system for short-time pulse jamming

A short-time pulse, self-adaptive technology, applied in the transmission system, radio transmission system, diversity/multi-antenna system, etc., can solve the problems of short duration, high interference power, difficult to capture and real-time suppression of pulse interference, and achieve elimination Impulse interference, low computational load, and the effect of improving the transmission performance of anti-pulse interference

Active Publication Date: 2021-09-21
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to propose a space domain real-time adaptive anti-jamming system for short-time pulse interference, which solves the problem that it is difficult to capture and suppress real-time pulse interference with the characteristics of suddenness, short duration, and large interference power.

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  • Airspace real-time adaptive anti-jamming system for short-time pulse jamming
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  • Airspace real-time adaptive anti-jamming system for short-time pulse jamming

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Embodiment 1

[0115] In this embodiment, anti-interference processing is performed on the microwave signals received by the triangular grid hexagonal array antenna with the array element spacing of 0.6λ and D=19, such as figure 2 As shown in the figure, the received microwave signal is processed by the radio frequency circuit, intermediate frequency sampling and digital down-conversion circuit to complete the amplification and filtering, down-conversion, intermediate-frequency filtering, intermediate-frequency analog-to-digital conversion and digital down-conversion filtering of the radio frequency signal to obtain the baseband signal.

[0116] In this embodiment, the center frequency of the intermediate frequency signal output by the radio frequency circuit is 5MHz, and the sampling rate of the analog-to-digital change is 80MHz. The intermediate frequency sampling and digital down-conversion circuit of each channel of 19 channels is as follows: image 3 As shown, the digital down-conversio...

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Abstract

The present invention discloses a space domain real-time self-adaptive anti-interference system for short-time pulse interference, which includes a baseband data buffer module, a digital beamforming module, a space-time estimation module for block interference, and a null trapping / static beamforming module. The baseband data caching module is used to divide and cache the baseband data by time T; the block-interference space-time estimation module performs pulse interference detection on the block-based baseband data to determine the interference quantity of each block of baseband data and angle; the null / static beamforming module is used to calculate the weight coefficient of the null / static beam; the digital beamforming module performs beamforming processing according to the weight coefficient corresponding to the baseband data of the block, and obtains the anti-jamming digital beam. The invention divides the data into blocks, and the interference characteristics in the data block are directly applied to the data processing of the block, thereby eliminating the pulse interference and realizing the suppression of the short-term strong pulse interference.

Description

technical field [0001] The invention belongs to the spatial self-adaptive anti-jamming technology of a digital array antenna, in particular to a spatial real-time self-adaptive anti-jamming system for short-term pulse interference. Background technique [0002] In the communication and radar systems, there are many reasons for the generation of pulse interference, including the interference caused by the objective natural environment such as lightning, multi-system coexistence, etc., and the active interference caused by human beings. As a typical time domain interference, pulse interference has the characteristics of suddenness, short duration and high interference power, which will cause serious errors in the communication system data at this moment, and the radar system cannot perform effective target detection and tracking. However, the conventional adaptive beamforming algorithm is more effective against continuous interference in the airspace, but has poor suppression ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/719H04B7/06G01S7/36G01S7/35G01S7/292G01S7/02
CPCG01S7/023G01S7/2928G01S7/354G01S7/36H04B1/719H04B7/0617
Inventor 马晓峰王铭盛卫星张仁李韩玉兵
Owner NANJING UNIV OF SCI & TECH
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