Abstract: A multibeam synthetic aperture sonar system that includes a sonar projector. The projector transmits a transmitted sonar signal. A multibeam sonar receiver receives a reflected sonar signal created by the reflection of the transmitted sonar signal off materials and objects ensonified by the transmitted sonar signal. The receiver generates an output signal representative of the reflected sonar signal. The synthetic aperture sonar processor receives the signal output from the multibeam sonar receiver and processes the signal with synthetic aperture algorithms.