DEM generation and error analysis using the first Chinese airborne dual-antenna interferometric SAR data

摘要: Terrain survey with traditional photogrammetry is often difficult in western China, such as Qingzang tableland at an average height of 5000 m above sea level and the southwest China area cloudy weather. To resolve terrain mapping, first Chinese single-pass airborne Interferometric Synthetic Aperture Radar InSAR system was successfully developed by Institute Electronics, Academy Sciences IECAS 2004. The main objective this article to examine evaluate performance SAR through interferometric processing error analysis. First, describes how high-precision digital elevation models DEMs are derived from dual-antenna data. In order improve precision, antenna eccentricity correction parameter calibration least square method LSM proposed. Based on bore-sight model, summarizes primary factors that influence accuracy data processing, analyses errors induced these factors. Then, global positioning GPS/inertial measurement unit IMU data, acquired stored position orientation POS, used for analysing quantitative relationships among platform height, baseline length, angle, look angle DEM error. experimental X-band measured ground control points GCPs validate DEM. evaluation results terms standard deviation SD mean AME comparing reconstructed reference GCPs. AMEs X-direction, Y-direction up 2.078, 9.149 1.763 m, respectively. SDs ±1.379, ±0.764 ±1.086 These agree previously calculated errors. value seems too large, a possible result general, initially meets requirements 1:50 000 mapping China.