An approach for target detection/state estimation that views the problem as one of a finite state search over the target parameter space is presented. This approach allows for a natural way to associate different types of measurements, such as frequency and coherence from multiple sensors, and also for dealing with multiple targets, dropouts, and clutter. We describe our model and present a computationally efficient search algorithm for target detection and target state estimation in a multitarget environment based on this model. The results of a two-sensor, multitarget computer simulation are discussed.