Coherent Broadband Signal Processing With Widely Separated Sonar Sensors

Current signal processing of broadband data from multiple sonar sensors is in most cases incoherent, unless the sensor elements are close together as for a sonar array. The correlation of data from widely spaced sensors is sensitive to relative motion of the sources and the sensors. Unless this motion is explicitly compensated for, coherent broadband processing in such cases is limited to very low frrquencies. This paper demonstrates broadband Doppler and time delay effects with an analytically soluble model and demonstrates the results with realistic time series simulations. An efficient algorithm for detecting and compensating for unknown source and sensors motions is then proposal based on insights from this analysis.