An active electronically scanned array radar requires air-to-ground ranging capability to estimate the range between a platform and the ground in the boresight direction. In this paper, a modeling and simulation approach is proposed to assess the performance of air-to-ground ranging under various scenarios. The proposed approach computes the received time-domain mono-pulse signal reflected by the ground. We simulate the coherent and non-coherent processing considering the time and frequency variations of the ground clutter. Furthermore, the effects of the surface clutter environment are analyzed and the compensation of the distortion caused by rolling the platform is simulated. The simulated mono-pulse signal is processed by using a polynomial curve fitting. Accordingly, the air-to-ground ranging performance is numerically assessed under various scenarios in which heterogeneous clutters and man-made targets exist.
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