Abstract: Inflight measurement of antenna pattern is a key technology of spaceborne SAR calibration. This paper describes a new method of antenna receive pattern measurement for spaceborne SAR using encoding transmitters. Considering the characters of SAR system, the principle is described briefly. The orthogonal modulation code is chosen and the arithmetic of signal generating, receiving, decoupling and processing is derived. The results of computer simulation prove that this measurement method is feasible.

Key words: encoding transmitters, Spaceborne SAR, Antenna pattern, Inflight measurement