Improved SAR scattered wave interference method based on floating platform

A floating platform and scattered wave technology, applied in the field of signal processing, can solve the problems of small interference range, distortion of interference effect, distortion, etc., and achieve the effect of overcoming short interference time, reducing distance distortion, and increasing implementation time.

Inactive Publication Date: 2014-03-05
XIDIAN UNIV
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Problems solved by technology

However, the disadvantage of this method is that it does not analyze the system parameters such as the height of the jammer, and does not consider the influence of the system parameter error on the jamming imaging results. During the implementation process, the jamming image will be "false", resulting in distortion of the jamming eff

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  • Improved SAR scattered wave interference method based on floating platform
  • Improved SAR scattered wave interference method based on floating platform
  • Improved SAR scattered wave interference method based on floating platform

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Embodiment 1

[0042] For SAR scattered wave interference, aiming at the range distortion and short interference distance caused by scattered wave interference in the prior art, the present invention designs an improved SAR scattered wave interference method based on floating platform, see figure 1 , the SAR scattered wave interference method of the present invention comprises the following steps:

[0043] Step 1: The jammer intercepts the radar signal

[0044] Based on the analysis of the interference image distortion and defocus problems existing in the prior art, the present invention adopts a technical solution of increasing the height of the jammer, specifically installing the jammer on a floating platform, and expanding the jamming signal by increasing the height Use the jammer installed on the floating platform to intercept the radar time-domain signal of the opponent, and obtain the radar time-domain signal data with the distance as the row vector and the azimuth as the column vector...

Embodiment 2

[0061] The improved SAR scattered wave interference method based on the floating platform is the same as that in Embodiment 1, combined below figure 1 and figure 2 , the improved SAR scattered wave interference method based on the floating platform of the present invention will be described in detail.

[0062] Step 1: Use the jammer installed on the floating platform to intercept the radar time domain signal

[0063] Use the jammer installed on the floating platform to intercept the radar time domain signal, and obtain the radar time domain signal data s with the distance as the row vector and the azimuth as the column vector J (t r ,t m ), where t r is the distance fast time, t m is the azimuth slow time.

[0064] Step 2: Use the sum of history differences to calculate the phase modulation coefficient, and perform phase modulation on the radar time domain signal

[0065] 2a) Use the jammer installed on the floating platform to detect and obtain the slant distance hist...

Embodiment 3

[0083] The improved SAR scattered wave interference method based on the floating platform is the same as that in Embodiment 1-2, combined with the attached image 3 The simulation effect diagram of the present invention describes in detail the reduction of distortion and the generation of realistic scenes. In the method of increasing the distance position of the modulation center of the irradiation area described in step 2b), the present invention increases the distance position of the modulation center of the irradiation area , reducing the defocus and distance distortion of the interference scene, producing a more balanced interference scene, and improving the fidelity of the interference scene.

[0084] see image 3 , the ordinate indicates the position in the distance direction, and the abscissa indicates the position in the azimuth direction, and the unit is m. There are 9 scatterers in the target area, and every two scatterers are separated by 100 meters to form a 3×3 l...

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Abstract

The invention discloses an improved SAR scattered wave interference method based on a floating platform. A jammer used for installing the floating platform intercepts radar time-domain signals; the distance position of the modulation center of a radar irradiation region, the course difference between the target center and the new modulation center and the course difference between the new modulation center and the irritation center are calculated, and the sum of the two course differences is calculated; a phase modulation coefficient is calculated by means of the sum of the course differences, and phase modulation is conducted on the radar time-domain signals; gain modulation is conducted on the signals modulated in a phase mode so as to form interference signals; a time-delay difference is calculated, N pulse recurrence intervals are added to the time-delay difference, and a delay clock number is calculated; the interference signals are transmitted to the radar irradiation region by means of the delay clock number, the interference signals interfere in later pulse signals, target-region echoes are overlaid with irradiation-region scattered echoes, and scattered wave interference is achieved. The improved SAR scattered wave interference method solves the problems that the interference modulation calculated amount is large and an interference scene defocuses, distorts and is small in interference range, and the improved SAR scattered wave interference method achieves efficient, vivid and large-range SAR scattered wave interference.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and further relates to a synthetic aperture radar (Synthetic Aperture Radar, referred to as SAR) scattering wave deception jamming method in the field of radar signal processing. Specifically, it is an improved SAR scattered wave interference method based on a floating platform. By forwarding the interference signal to the radar irradiation area, effective interference is implemented. It is used for the implementation of scattered wave interference against synthetic aperture radar, especially suitable for the entire irradiation of synthetic aperture radar. area for scattered wave interference. Background technique [0002] SAR jamming techniques can be divided into suppressive jamming and deceptive jamming. The principle of suppressive jamming is relatively simple, but the power requirement for the jammer is very high. Deceptive jamming is to jam the SAR system by simulating radar ech...

Claims

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Application Information

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IPC IPC(8): G01S7/38G01S13/90
CPCG01S7/38G01S13/90G01S7/021
Inventor 周峰赵博崔乐园陶明亮
Owner XIDIAN UNIV
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