A Judgment Method for Ignoring FM Continuous Wave Circular Sar Intrapulse Platform Movement
A frequency modulation continuous wave, internal platform technology, applied in the field of radar
Active Publication Date: 2020-12-29
NAT UNIV OF DEFENSE TECH
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[0004] The object of the present invention is to determine whether the impact of intrapulse platform motion on imaging results can be ignored in the imaging process of the frequency-modulated continuous wave circular SAR frequency domain method, and the pulse system circular SAR frequency domain method under the stop-go-stop approximation can be used for imaging The problem is to provide a judgment method only related to the parameters of the frequency-modulated continuous wave circular SAR imaging system. This judgment method can be used to quickly and effectively judge whether the frequency-modulated continuous wave circular SAR can ignore the intrapulse platform motion and guide Technicians can choose the appropriate imaging method, which can provide theoretical support for the research of frequency domain imaging method of FM CW circular SAR
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[0063] In order to better illustrate the technical solutions of the present invention, the implementation manners of the present invention will be further described below in conjunction with the accompanying drawings.
[0064] figure 1 It is an overall block diagram of the method for judging intrapulse platform motion in FM continuous wave circular SAR of the present invention, specifically comprising the following steps:
[0065] Step 1 The echo modeling of FM CW circular SAR includes calculating the instantaneous slope distance of FM CW circular SAR and determining the echo signal of FM CW circular SAR, based on the following steps:
[0066] (1.1) Calculation of the instantaneous slant range of FM CW circular SAR: the radar platform moves circularly at an angular velocity ω in a plane with a height of H, the radius of its circular trajectory is R, and the radar position is (Rcosθ, Rsinθ, H), Where θ is the azimuth observation angle at the time t of the whole time, and θ=ωt,...
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The invention belongs to the technical field of radars, and discloses a judging method capable of ignoring frequency modulated continuous wave circumference synthetic aperture radar (SAR) pulse interior platform movement. The judging method comprises the steps: (1) frequency modulated continuous wave circumference SAR echo modeling is conducted; (2) time-domain echo signals after frequency modulated continuous wave circumference SAR remaining video phase removal are obtained; (3) frequency modulated continuous wave circumference SAR wave-number domain echo signals are obtained; (4) a two-dimensional wave-number spectrum of a frequency modulated continuous wave circumference SAR is obtained; (5) the phase error, introduced at the two-dimensional wave-number domain, of pulse interior platform movement is analyzed; and (6) the judging method ignoring pulse interior platform movement in the imaging process through a frequency modulated continuous wave circumference SAR frequency domain method is obtained. According to the judging method, whether a system can ignore a pulse interior platform in the imaging process through the frequency domain method or not can be quickly and efficientlyjudged only through frequency modulated continuous wave circumference SAR imaging system parameters, a technicist is guided to select the appropriate imaging method, and theoretical support can be provided for simplifying the imaging process through the frequency modulated continuous wave circumference SAR frequency domain method.
Description
technical field [0001] The invention belongs to the technical field of radar, and relates to a judgment method for ignoring the motion of a frequency modulation continuous wave circular SAR intrapulse platform in a frequency domain imaging method of a synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging technology. Background technique [0002] Infrared and photoelectric reconnaissance equipment cannot work in harsh weather conditions, and their applications are limited by weather and environmental conditions. SAR is a high-resolution imaging radar that can conduct all-weather and all-weather reconnaissance and surveillance of target areas of interest under extremely low visibility and extremely harsh and complex conditions, and obtain high-resolution images similar to optical photography. However, due to the limitation of the imaging azimuth accumulation angle of traditional strip SAR, it is difficult to obtain rich target scattering characteristics, which limit...
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IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/9088
Inventor 付耀文张健丰张文鹏杨威
Owner NAT UNIV OF DEFENSE TECH