Simulation method of linear frequency modulation continuous wave synthetic aperture radar video signal

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

technical field [0001] 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 [0002] Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) is a high-resolution imaging radar. SAR actively emits electromagnetic waves (from microwave bands to millimeter wave bands), and receives echo signals reflected by targets to achieve imaging through complex signal processing processes. Ability to work around the clock and 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. [0003] The concept of chirp continuous wave SAR was first proposed by the University of London and firstly applied to the aircraft altimeter. Compared with traditional pulse-Dopple...

AI Technical Summary

Problems solved by technology

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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