Effect of distributed POS transfer alignment on InSAR interferometic measurement

In order to get the flexural angel error caused by distributed POS due to atmospheric disturbances and find this error's corresponding relationship with the altitude error caused by interferometric synthetic aperture radar (InSAR), a transfer alignment method using the "velocity+attitude" matching algorithm was proposed. Then the error of the estimation is used as the input parameter of the height measurement model to obtained the altitude error caused during transfer alignment. A distributed measurement platform was built to verify the experiment, and the following analyses were made about the platform: 1) according to the motion model of the flexural wings, the flexural angel in y coordinate axis was added to the Kalman filter's state variables; 2) the absolute error expressions of InSAR interferometry measurement and the method of selecting the parameters was deduced; 3) according to the filtering results and the mechanism of altitude measurement, the roll angel error's influence on InSAR altitude information was analyzed. The simulation results show that the horizontal and azimuth misalignments by the proposed method are superior to 0.009° and 0.015° respectively, and when the roll angel error is within ±0.089°, the altitude error is less than 4.2 m.