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Method and device for suppressing suppressing interference

A technology for suppressing interference and distance migration, applied in the field of radar detection

Pending Publication Date: 2022-06-17
TSINGHUA UNIV
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Problems solved by technology

[0004] This application provides a suppressing method for suppressing interference. In the case of active suppressing interference with variable polarization, a suppressing interference suppression method based on generalized squint projection transformation is realized, which can effectively avoid noise comparison for pulses with similar polarizations between the target and the interference. Large, and effectively solve the problem of coherent accumulation under the interference of variable polarization suppression

Method used

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  • Method and device for suppressing suppressing interference
  • Method and device for suppressing suppressing interference
  • Method and device for suppressing suppressing interference

Examples

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example 1

[0098] An interference suppression method based on generalized squint projection transformation, such as figure 2 shown, including the following steps:

[0099] Step 201: Calculate the squint projection matrix

[0100] Let the cumulative number of pulses be M, and the polarization angle of each pulse to suppress the interference is θ Ji ,i=1,2,..,M, the scattering matrix of the target is S=[S hh S hv ;S vh S vv ], n m , n c is the noise of the horizontal and vertical receiving channels, obeying the normal distribution, with n m,c ∈N(0,σ m,c 2 ). Among them, including the target E r , suppress interference E J and noise E N The i-th pulse signal of , as follows:

[0101]

[0102] In the formula, θ S is the target polarization angle, s r is the target echo signal, s J It is a targeted radio frequency jamming signal.

[0103] Among them, construct the squint projection transformation matrix:

[0104]

[0105] According to the property of squint project...

example 2

[0151] The following uses an example to illustrate the specific implementation process of the above method for suppressing interference.

[0152] Step 1: Preprocessing step to calculate the horizontal received signal E containing target, interference and noise h , vertical receive signal E v .

[0153] Step 1.1 Calculate the target echo signal. Let the radar transmit pulse be a chirp signal s 0 (t), as follows:

[0154] s 0 (t)=A 0 rect(t / T)exp{j2πf c t+jkt 2 } (1)

[0155] In the formula, A 0 is the signal amplitude, T is the pulse time, f c is the signal carrier frequency, and k is the chirp frequency.

[0156] Taking the horizontal emission polarization as an example (both vertical single polarization and dual emission polarization are established), let the target scattering matrix be S, and the receiving antenna is horizontal and vertical polarization dual receiving, the radar's received signal to the target is as follows:

[0157]

[0158] In the formula, s...

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Abstract

The invention discloses a suppression method and device of suppressing interference. The method comprises the following steps: performing suppression interference processing on an echo signal of a radar by using a squint projection transformation matrix; performing range migration processing on the matrix after suppressing interference processing; similarity criterion is carried out on each pulse after range migration processing, pulse accumulation is carried out on the pulses meeting the similarity criterion, and the target amplitude in the echo signal is determined.

Description

technical field [0001] This paper deals with anti-jamming technology in the field of radar detection, especially a suppression method for suppressing interference. Background technique [0002] In the field of radar detection, for active suppression of interference under the same frequency and main lobe, the anti-jamming method in the polarization domain can effectively suppress the interference. Patents CN 106125053 A "Polarization Anti-jamming Method of Pulse Doppler Radar" and CN 107561512 A "Polarization Cancellation Method of Pulse Doppler Radar Anti-Suppression Drag Interference" are all using the method of polarization cancellation to suppress Suppressing interference, under the variable polarization suppression interference, due to the constant change of the receiving polarization angle, on the one hand, the loss of the target amplitude will be caused, and on the other hand, the subsequent coherent accumulation will also be affected. [0003] On the premise that the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 何耀民杨健殷君君
Owner TSINGHUA UNIV
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