Dual-station SAR imaging method based on variable squint elliptical beam synchronization model
An elliptical beam and imaging method technology, applied in the field of signal processing, can solve the problems that restrict the development of high-resolution bi-station SAR imaging processing and so on.
Active Publication Date: 2019-03-08
浙江云杭光电科技有限公司
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After an in-depth analysis of the signal model of the non-level flight dual-static SAR squint imaging system, it is found that the traditional dual-static SAR beam synchronization signal model has a large error, which restricts the development of high-resolution dual-static SAR imaging processing
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[0287] image 3 is the geometric model of SAR in non-level flight dual-station configuration, where P 0 ,P 1 The two points are the imaged scene center point target and any point target respectively. The transmitter and receiver are on their respective lines at different speeds v T and v R Flying, oblique angles are θ T and azimuthal space-varying θ R (η c ). R R (η) and R T (η) are the point targets P 1 It crosses the time t at the center of the beam c Instantaneous slant range to receiver and transmitter.
[0288] Table 1 shows the system simulation parameters of the scene center used in this illustration example, and the range and azimuth widths of the imaging area are 1.0km and 2.0km respectively, and the theoretical resolution is 1.0m. The target P selected in this example 0 , P 1 , P 4 , P 5 and P 6 The positions on the ground two-dimensional coordinate system are (0, 30000) m, (-1000, 30294) m, (1000, 29776) m, (0, 29004) m and (0, 31002) m. Among them...
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The invention discloses a dual-station SAR (Synthetic Aperture Radar) imaging method based on a variable squint elliptical beam synchronization model. The method comprises the steps that: 1. a spatialgeometric model of transmitting and receiving beam synchronization is constructed based on a dual-station non-level-flight SAR system, and the azimuth spatial degeneration of the oblique angle of a receiver is analyzed; 2. the distance pre-processing of the signals is performed in a distance frequency domain; 3. a new variable squint elliptical beam synchronization signal model is constructed inthe two-dimensional plane; 4. the azimuth-dependent part of the remaining high-order range cell migration is modeled based on the new synchronization model, and a new fourth-order perturbation function is constructed to effectively correct the remaining high-order range cell migration to achieve ADH-RCMC (Azimuth-dependent high-order range cell migration correction) and obtain the result of distance processing; and 5. the azimuth space characteristics of the Doppler phase is modeled based on the new synchronization model to improve the ENLCS algorithm and design the filter for azimuth compression so as to achieve high-resolution focusing. The dual-station SAR imaging method based on a variable squint elliptical beam synchronization model ensures dual-station SAR transmitting and receivingbeam synchronization, and makes important improvements to the distance and orientation of the imaging algorithm.
Description
technical field [0001] The invention belongs to the field of signal processing, and relates to high-resolution imaging processing of a dual-station synthetic aperture radar, and proposes a new dual-station SAR variable squint elliptical beam synchronization model to accurately describe point targets, center distances between transceivers and receivers The azimuth space-varying characteristics of oblique angles ensure that the receiver and transmitter can keep in sync with the illuminated area. Based on the signal model, the invention proposes a new non-level flight dual-static SAR imaging processing method. In the range direction, a new azimuth-dependent high-order range cell migration correction (Azimuth-dependent high-order range cell migration correction, ADH-RCMC) method is proposed to improve the processing accuracy in the range direction; in the azimuth direction, an improved Azimuth-space variable beam synchronization ENLCS algorithm to obtain better azimuth focusing e...
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IPC IPC(8): G01S13/90
CPCG01S13/9094G01S13/9041G01S13/9058
Inventor 钟华陈国瑾刘静叶宗奇张艳军严爱博
Owner 浙江云杭光电科技有限公司