Airborne Bistatic Sar System Simulation And Cs Imaging Algorithm

Bistatic SAR is the synthetic aperture radar whose transmitter and receiver are located on separated platforms. It can acquire non-backscatter information from target zone, and the quiet passive receiver is more difficult to be detected and jammed compared to monostatic SAR. Bistatic SAR is becoming one of the hotspots in radar imaging technology in recent years.The geometry and echoed signal models of airborne bistatic SAR in general flight configuration are introduced. Two-dimensional matched filtering principle is examined and theoretical relationship between resolution and bistatic SAR system parameters is suggested.The effect of local oscillator syntonization error and triggering time synchronization error on bistatic SAR imagery are analyzed based on their error models. Useful simulation results are provided for system design.Unlike the monostatic SAR, two independent local oscillators are used for up/down conversion in bistatic case, so low frequency components of phase noise cannot be cancelled. Flicker noise is approximately simulated by power law model of phase noise spectral density. Allan variance estimated by simulated noise and calculated theoretically using power law model are well matched. The effect of phase noise on azimuth focusing is given by Monte Carlo experiment. Theoretical analysis and simulation results show that it is mainly flicker noise, not phase or frequency white noise, that affects bistatic SAR imaging performance.Triggering time synchronization error model is derived, and based on phase noise model of frequency source, random synchronization error is considered. The effect of fixed and linear error on focusing quality is given by simulation.A chirp scaling algorithm for airborne bistatic SAR is proposed, which is suitable for the flight configuration that transmitter and receiver follow parallel path with equal velocity in broadside looking mode. Airborne bistatic SAR echoed signal model of this particular flightpaths is derived. The model is converted into the range Doppler space and is mapped from double range variables to single range variable domain. The...