Principle of High-resolution Airborne SAR Aerial triangulation supported by sparse GCPs

Principle of High-resolution Airborne SAR Aerial triangulation supported by sparse GCPs

The 3D ground coordinates can be computed out through formula (1) without GCPs supported by flight control parameters, and what is important is the preprocessing of GPS/INS data. For acquiring accurate ground objects 3D coordinates, the spatial and temporal calibration of GPS and INS data is essential. Then, we can obtain the instant values through interpolator computation, and absolute space coordinates from least square adjustment.

4 Test Site and Flight Design
We chose a test site on the southwest of Zhengzhou, Henan Province, in China. The total area is about 20km×80km,and in the western area, almost 35 percent of total area with height from 500m to 1400m, are covered with poplar and pinaster. In other plain area, cultivated land is the most land use. Our airborne SAR remote sensing data set are acquired from the SAR sensor system carried on YUN-12 type airplane (see as Fig.4), with single-antenna, 1m-resolution and same-side stereo imaging mode provided with GPS and inertial navigation system equipments synchronously. We designed the fight courses with 60% overlap between adjacent paths see as Fig.5, At the same time, we distributed and mapped 12 GCPs around the area (see as Fig.6) utilizing homemade aluminous radar corner-reflector. and acquired the test data source of one path just as showed in Fig.7.

Fig.4 YUN-12 airplane

Fig.5 the flight course

Fig.6 12 GCPs distribution

Fig.7 the test data source of one path
Though, it has not the final accuracy analysis of the test by now, but the first results has verified the mathematical models and presented the potential of mapping application.

6 Conclusions
In this paper, the application perspective of high-resolution airborne SAR triangulation technique and its corresponding mathematical vector models has been described in detail. Though, supported by sparse GCPs distributed around the test area, the first results are not so satisfying, we still found that independent models based and GPS/INS supported airborne SAR triangulation technique can reduce the demand of GCPs, and realize dense GCP network of some area difficult to survey, or SAR imagery mosaicing of large area.

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