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Polarization filtering suppression method for active interference of main lobe of SAR (Synthetic Aperture Radar)

A technology of polarization filtering and active interference, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc. It can solve the problems that anti-interference means are difficult to achieve active interference suppression, and achieve suppression of active interference. Source interference, high efficiency, and good system compatibility

Inactive Publication Date: 2022-04-12
中国人民解放军火箭军工程大学
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Problems solved by technology

[0004] The purpose of the present invention is to provide a polarization filter suppression method for SAR radar main lobe active interference based on the orthogonal dual polarization antenna radar system, which can realize single polarization active interference in the SAR radar antenna main lobe. The polarization filter suppression of interference effectively solves the problem that it is difficult to achieve effective active interference suppression using traditional time-frequency domain and space domain anti-interference methods

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  • Polarization filtering suppression method for active interference of main lobe of SAR (Synthetic Aperture Radar)
  • Polarization filtering suppression method for active interference of main lobe of SAR (Synthetic Aperture Radar)
  • Polarization filtering suppression method for active interference of main lobe of SAR (Synthetic Aperture Radar)

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[0041] Important technical terms involved in the present invention are explained as follows:

[0042] 1. SAR radar: Synthetic Aperture Radar (SAR).

[0043] 2. Jones vector method: the method of expressing the electric field vector of electromagnetic waves by using the polarization angle and the polarization phase difference.

[0044] 3. Stokes vector: proposed by Stokes, four parameters are used to describe the intensity and polarization state of electromagnetic waves. The four parameters form a four-dimensional mathematical vector, namely the Stokes vector.

[0045] In order to further illustrate the effectiveness of the method proposed in the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and typical embodiments.

[0046] The polarization filtering suppression method of the SAR radar main lobe active interference provided by the present invention comprises the following steps:

[0047] Step 1, using t...

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Abstract

The invention discloses a polarization filtering suppression method for active interference of a main lobe of an SAR (Synthetic Aperture Radar) radar. The polarization filtering suppression method comprises the following steps of: 1, representing a received signal of an orthogonal dual-polarized antenna in an orthogonal dual-polarized antenna radar system by adopting a Jones vector method, and constructing an interference suppression polarization filtering operator; step 2, extracting an echo interference sample of the orthogonal dual-polarized antenna radar system to carry out orthogonal polarization channel data matrix calculation, and substituting a matrix calculation result into a Stokes vector to estimate a polarization angle and a polarization phase difference of interference; and step 3, performing polarization filtering on the echo received by the orthogonal polarization channel by adopting an interference suppression polarization filtering operator to obtain echo data. According to the method, in an orthogonal dual-polarized antenna SAR radar system, an interference suppression polarization filtering operator is constructed through interference polarization parameter estimation based on echoes, the operator is used for polarization filtering of dual-polarization channel echo data, and main lobe single-polarization active interference can be effectively suppressed.

Description

technical field [0001] The invention relates to the technical field of SAR radar signal processing, in particular to a polarization filter suppression method for SAR radar main lobe active interference. Background technique [0002] With the continuous development of electronic countermeasures technology, the electromagnetic interference environment faced by SAR radar is becoming more and more complex, which seriously affects the detection performance of radar. In practical applications, the interference patterns faced by SAR radar can be divided into passive interference and active interference. Passive interference includes chaff interference, corner reflector interference, etc., which can be suppressed in combination with SAR imaging and target feature recognition; Active jamming includes active suppression jamming, active spoofing jamming, and joint jamming. Jamming is achieved by transmitting high-power noise signals or transponding signals to cover up target signals. T...

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Application Information

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IPC IPC(8): G01S7/02G01S7/36G01S13/02
Inventor 胡昌华胡虹钟都都邬伯才方晓竺红伟张伟科尤帅黄丰生刘仍莉
Owner 中国人民解放军火箭军工程大学
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