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Multi-radar interference inhibition method for preventing interference in digital radio frequency storing and forwarding

A digital radio frequency storage and forwarding interference technology, applied in radio wave measurement systems, instruments, etc., can solve problems affecting radar ranging and tracking, and achieve the effect of eliminating main lobe interference and suppressing dense false target interference.

Active Publication Date: 2016-03-09
HOHAI UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

There are a large number of false targets in front of and behind the target, which seriously affects the ranging and tracking of the radar

Method used

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  • Multi-radar interference inhibition method for preventing interference in digital radio frequency storing and forwarding
  • Multi-radar interference inhibition method for preventing interference in digital radio frequency storing and forwarding
  • Multi-radar interference inhibition method for preventing interference in digital radio frequency storing and forwarding

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Such as figure 1 , figure 2 As shown, the distance between radar A and radar B is 12km, and radar A transmits a chirp signal with a bandwidth of 1MHz and a pulse width of 200us. After jammer J receives the signal from radar A, it performs digital radio frequency storage sampling, performs Doppler modulation and amplitude modulation on the sampled radar signal, and then transmits it intensively through the antenna of jammer J. After receiving the echo data of the target and jammer J, radar A sends the data to radar B through optical fiber AB. The signal delay is determined by the K code with a special mark in the radar transmitted signal and is used for timing alignment of radar A and radar B received data.

[0027] The aligned received data of radar A and radar B are used as input and sent to the interference canceller based on the minimum mean square error....

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Abstract

The invention discloses a multi-radar interference inhibition method for preventing interference in digital radio frequency storing and forwarding. The method comprises the following steps: firstly, two pieces of radar receiving radar echo data; secondly, conducting interaction on the data of the radar to enable the data of the two pieces of radar to be synchronous; thirdly, aligning the integrated echo interference data of the two pieces of radar in sequence, and then performing interference cancellation processing based on the minimum mean squared error, the least square or the like; fourthly, providing trace points exceeding a detection threshold after the two pieces of radar conduct pulse voltage matching and constant false-alarm rate (CFAR) processing on the radar interference echo data after interference cancellation of the data; and fifthly, fusing the trace points of the two pieces of radar, and providing a target track. According to the multi-radar interference inhibition method, two radar platforms coordinate with each other through a network, and after received data of two pieces of radar is aligned sequentially, false interference of digital radio frequency storing and forwarding received by radar main lobes is prevented by means of the isotropy characteristics of digital radio frequency storing and forwarding interference signals, the non-isotropy characteristics of target echo signals as well as amplitude differences between signals and interference.

Description

technical field [0001] The invention relates to a multi-radar interference suppression method against digital radio frequency store-and-forward interference, which belongs to the technical field of radar anti-interference. Background technique [0002] Modern radar has become the most widely used and most important equipment in the field of information acquisition and precision guidance. Its role in timely, accurate and comprehensive acquisition of target information in a vast combat area is irreplaceable. However, radar is facing an increasingly complex electromagnetic environment, and various interferences bring serious challenges to radar's normal function of detecting targets. [0003] In order to improve combat capabilities in complex electromagnetic environments, the radar adopts various anti-jamming measures such as low sidelobe, frequency agility, sidelobe concealment, and sidelobe cancellation. However, it is usually powerless against main-lobe or near-main-lobe ja...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 麻清华蒋德富
Owner HOHAI UNIV
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