In recent years, spaceborne/airborne hybrid bi-static synthetic aperture radar (SA-BSAR) has been proposed as a new
kind of microwave remote sensor. The SA-BSAR system combines the invulnerability of the spaceborne SAR with high
resolution and flexibility of the airborne SAR. To decrease the cost for developing a new system, a suitable flexible and
powerful simulation tool is essential. Nevertheless, the currently available SAR simulators, which were developed for
other SAR constellation, are not sufficient for SA-BSAR. This paper presents a new simulation architecture. To improve
the flexibility and the suitability of the architecture, both the requirement of SA-BSAR and the requirements of other
kinds of bi- and multi-static SAR are all fulfilled in designing the architecture. Modular configuration is the key for the
flexibility. The requirements, the framework and the steps in performing the simulator are discussed in detail.
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