Abstract:

The principle of distributed InSAR geolocation is introduced in this paper, and the relationship between the interference baseline and the spatial states measurement is analyzed. The complete definition of the interference baseline is proposed. The interference baseline is decomposed into the spatial interference baseline and the time interference baseline. The time interference baseline is obtained by a master satellite absolute orbit determination, and the spatial interference baseline is obtained by a high precision intersatellite relative position determination. The influence of the errors of satellite orbit speed, attitude and antenna fix to the interference baseline measurement precision is analyzed. Different attitude precision requirements to the different baseline measurement techniques are discussed, which provides a technique support for the design of a disturbed InSAR spatial state measurement scheme and the analysis of the corresponding measurement precision criterions.

Key words: distributed InSAR;interference baseline;spatial states measurement