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Passive interference suppression method in complex environment based on cognitive radar waveform design

A technology of passive interference and waveform design, which can be used in the reflection/re-radiation of radio waves, radio wave measurement systems, and the use of re-radiation, etc., and can solve problems such as active interference.

Inactive Publication Date: 2019-11-22
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

These articles design radar waveforms from different angles and for different purposes, but they involve either active interference or specific passive interference. They do not design waveforms based on prior information and consider both clutter and passive interference.

Method used

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  • Passive interference suppression method in complex environment based on cognitive radar waveform design
  • Passive interference suppression method in complex environment based on cognitive radar waveform design
  • Passive interference suppression method in complex environment based on cognitive radar waveform design

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Embodiment Construction

[0058] Such as image 3 As shown, the present invention provides a passive interference suppression method in a complex environment based on cognitive radar waveform design, comprising the following steps:

[0059] Step 1, determine the radar transmission and reception signal model. The signal emitted by the radar is s(t), which stimulates the target, passive interference and clutter and returns to the receiver. The echo is mixed with noise signals at the receiver, such as figure 2 shown. The received signal y(t) can be expressed as

[0060]

[0061] in Represents the convolution operation, h(t), c(t), j(t) are the target response, clutter response, and passive interference response respectively, and their Fourier transforms are H t (f), H c (f) and H j (f). n(t) is white Gaussian noise whose Fourier transform is N(f).

[0062] Step 2, determine the response model of signal, clutter, interference and noise. Assuming that the response c(t) of the clutter is a wide...

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Abstract

The invention provides a passive interference suppression method in a complex environment based on cognitive radar waveform design. The passive interference suppression method comprises the followingsteps: a radar transmitting and receiving signal model is determined; response prior information of a target, clutter, passive interference and noise is determined; a detector is determined and detector performance is obtained; and waveform design is carried out according to the bandwidth and the transmitting energy, and transmitting signal frequency domain energy distribution is calculated, wherein the obtained signal frequency domain energy spectrum is used for transmitting signals. Through the clutter and passive interference confrontation-oriented waveform design, the interference suppression-oriented energy distribution mode can be designed in an ultra-wideband frequency domain based on the prior information of clutter and passive interference, so that the interference response is suppressed, and the target detection and recognition capability of the radar under complex environmental conditions is improved.

Description

technical field [0001] The invention relates to the field of radar waveform design anti-interference, in particular to a passive interference suppression method in complex environments based on cognitive radar waveform design. Background technique [0002] The complex electromagnetic environment faced by the radar mainly comes from the influence of various interference environments on the radar. These interferences are mainly composed of natural environment interference and man-made interference. Natural environment interference mainly includes ground clutter, sea clutter, cloud, fog, rain, snow and meteorological interference, etc. Man-made interference mainly includes man-made passive interference and man-made active interference. Source interference mainly includes chaff, corner reflectors, passive false targets, etc. At present, the prominent problems such as weak anti-jamming ability, poor electromagnetic compatibility, and degradation of combat performance in complex ...

Claims

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Application Information

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IPC IPC(8): G01S7/02G01S13/02
CPCG01S7/023G01S13/0209
Inventor 朱炳祺杜科陆满君宋柯唐文明于祥祯陆小辰
Owner SHANGHAI RADIO EQUIP RES INST
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