3-D target height extraction via high squint airborne SAR

An efficient three-dimensional target height extraction method via high squint airborne synthetic aperture radar(SAR) is introduced in this paper. Here we obtain two SAR images of the interested terrain from two parallel flight tracks, utilizing the geometry to calculate the height of the target. Due to the high squint angle, the spectrum of the range-azimuth is tilted. Therefore, the actual azimuth bandwidth is much lager than its effective azimuth bandwidth and a larger pulse repetition frequency(PRF) is needed to avoid azimuth ambiguities. This will increase the amount of calculation. A linear range cell migration correction(RCMC) and azimuth demodulation are taken in advance to correct the spectrum and move it to the baseband. Raw data of high squint airborne SAR in S-band is simulated and the imaging result is analyzed. Simulation results show that the target height can be acquired, and also confirm the validity and efficiency of the algorithm.