论文部分内容阅读
The bistatic spaceborne/stationary In SAR configuration could be applied to generate digital elevation model(DEM). However, two factors limit the DEM precision improvement. On one hand, due to the effects of the illuminator’s sidelobe and the high objects’ shadow, the pixels in the corresponding area might be polluted by the noise. On the other hand, owing to the presence of deviation(between the real value and the nominal value of the master/slave antenna positions), after utilizing the nominal value to compensate for the reference phase, the residual reference phase would remain. In order to solve the problems, we proposed a new bistatic DEM generation algorithm. Firstly, we applied the coherence-phase joint analysis method to select high-coherence points. Secondly, we deduced the transforming relationship from the deviation to the residual reference phase, and then compensated for the residual reference phase. In the experiment, the Yao Gan-3(an L-band spaceborne SAR) was selected as the transmitter and the two stationary receivers were mounted on the top of a tall building. The algorithm recommended in this paper was applied to process the measured bistatic data. The analysis of the results demonstrated that the elevation error of the generated DEM for some targets had been limited to the level of 1–2 m.
The bistatic spaceborne / stationary In SAR configuration could be applied to generate a digital elevation model (DEM). However, two factors limit the DEM precision improvement. On one hand, due to the effects of the illuminator’s sidelobe and the high objects’ shadow, the On the other hand, owing to the presence of deviation of (between the real value and the nominal value of the master / slave antenna positions), after utilizing the nominal value to compensate for the Reference, the residual reference phase would remain. we applied a new bistatic DEM generation algorithm. Secondly, we applied the coherence-phase joint analysis method to select high-coherence points. Secondly, we deduced the transforming relationship from the deviation to the residual reference phase, and then compensated for the residual reference phase. In the experiment, the Yao Gan-3 (an L-band spaceborne SAR) was selected a The analysis of the results of that results in the elevation error of the generated DEM for some targets had been limited to the level of 1-2 m.