The Defence Forces as well as the industry consider simulating different systems as a well-established method of saving both time and money. Fast computers of today make it possible to simulate those experiments and situations that previously needed to be performed with real equipment. The live experiment can be performed with higher precision when valuable knowledge is obtained by simulating a certain situation in advance. The institution of Electronical Warfare at the Swedish Defence Research Agency is developing technologies for jamming SAR-systems. SAR stands for Synthetic Aperture Radar and describes a radar system that, with an artificial radar antenna, generates photo like pictures of the ground clutter that usually is a problem for ordinary radar systems. Since a SAR-system can operate independently of light- and weather conditions such a system would in a war situation be an indirect threat for our air bases, harbours etc. Protection against SAR systems is obtained by strategic positioning of a set of jammers that will generate and transmit noise in order to prevent information collection. As a part of the SAR-jammer development there is a need for a program in which relevant jam situations can be simulated. A description is given in this report of the master thesis work whose aim was to develope such a simulation program.