Simulating SAR Images and Correcting Terrain Radiation Using DEM

doi:10.13474/j.cnki.11-2246.2017.0215

Abstract

Abstract: The simulated SAR image is beneficial to the automatic registration of the control points and image correction,especially in the mountains, where it is very difficult to get the ground control point. Based on the analysis of SAR imaging geometry and characteristics of ALOS PALSAR satellite orbit parameters, the range doppler (RD)geo-location model is used to calculate the position of the radar imaging point for each grid point of the DEM. The SAR image is simulated, the local incidence angle, projection angle,regularization factor are extracted. The simulated SAR image coincides with the real SAR image texture, which is beneficial to the automatic registration of the control points. And the terrain radiation correction model based on the regularization factor and angle of incidence is constructed to eliminate the distortion caused by the area effect and terrain undulation. From the analysis results, the difference of the brightness and darkness of the image after correction is obviously reduced. It has certain practical significance to radar quantitative inversion research.

Key words: PALSAR, SAR simulation, digital elevation model, terrain radiation correction

CLC Number:

XUE Dongjian, LI Zengyuan, ZHENG Jie, LI Chengrao, LI Wanqiu. Simulating SAR Images and Correcting Terrain Radiation Using DEM[J]. 测绘通报, 2017, 0(7): 14-17.

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