Simulation method of linear frequency modulation continuous wave synthetic aperture radar video signal
A synthetic aperture radar and linear frequency modulation technology, applied in the radar field, can solve problems such as large errors, increase the complexity of the processing process, limit the versatility of simulation methods, etc., and achieve the effect of strong versatility
Inactive Publication Date: 2008-10-29
BEIHANG UNIV
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These two methods are feasible for slow-moving platforms to close-range observations (UAV and minicomputer platforms), but when applied to high-speed moving platforms for long-distance observations with large forward squints, large errors will occur; Although compensation can be performed in subsequent processing, it increases the complexity of the processing process and limits the versatility of the simulation method
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Abstract
The invention provides a simulation method for a linear frequency modulation continuous wave synthetic aperture radar video signal, which comprises the following steps: simulated synthetic aperture radar system parameter information is set and read; the information parameter of a target is set; a simulated time is treated with discretization; the instantaneous positions of a radar platform and the target are respectively calculated, and a distance vector between a phase center and the target is obtained according to geometric position relation; a one-dimension echo signal is obtained by combining the echo signal mathematic model of the synthetic aperture radar and radar system parameters; the one-dimension signal is divided according to pulse repetition period and formatted into a two-dimension signal, the two-dimension signal with Na multiplied by Nr is obtained after the total data is stored, thus finishing the fine simulation of the linear frequency modulation continuous wave synthetic aperture radar video signal. The more accurate echo simulation signal can be obtained by utilizing the simulation method, and the simulation method is especially suitable for a frequency modulation continuous wave signal with high-speed movement, long distance and severe oblique observation condition of the radar and has more excellent realization efficiency, and stronger adaptability and compatibility.
Description
A Simulation Method of LFM Continuous Wave Synthetic Aperture Radar Video Signal technical field The invention belongs to the field of radar technology, in particular to a method for simulating video echo signals of Linear Frequency Modulated Continuous Wave (LFMCW) Synthetic Aperture Radar (SAR). Background technique Synthetic Aperture Radar (SAR, Synthetic ApertureRadar) is a high-resolution imaging radar. SAR actively emits electromagnetic waves (from the microwave band to the millimeter wave band), and receives the echo signal reflected by the target to achieve imaging through a complex signal processing process. Ability to work around the clock. Chirp is a common signal waveform of synthetic aperture radar. The traditional SAR system adopts pulse Doppler chirp signal, and its echo model simulation and imaging algorithms are relatively mature. The concept of chirp continuous wave SAR was first proposed by the University of London and firstly applied to the aircraft a...
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IPC IPC(8): G01S7/02G01S13/90
Inventor 陈杰王莹段世忠杨威李春升李显军
Owner BEIHANG UNIV
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