Description

US Patent no. 4,313,184 Sonar Systems, by Leonard Jarman et al., 1/26/1982; US Patent no. 4,355,311 Multibeam Single Frequency Synthetic Aperture Radar Processor for Imaging Separate Range Swaths, by Atul Jain, 10/19/1982; US Patent no. 4,400,803 Wide Swath Precision Echo Sounder, by Fred Spiess et al., 8/23/1983; US Patent no. 3,787,803 High Performance Meter Depth Sounder for Automatically Indicating Depth Without Manual Adjustment, by John Beebe, 1/22/1974; US Patent no. 4,288,866 Ultrasonic Image System, by George Sackman, 9/8/1981; US Patent no. 4,214,148 Digital Time-Delay Beamformer for Sonar Systems, by Adrian van't Hullenaar, 6/16/1981; US Patent no. 4,316,270 Digital Time-Delay Beamformer for Sonar Systems, by Adrian van't Hullenaar, 2/16/1982; US Patent no. 3,742,438 Echo Sounding Apparatus with Automatically Regulated Receiver Gain, by Raymond Brede et al., 6/26/1973; US Patent no. 4,232,380 Underwater Mapping Apparatus and Method, by Roger Caron et al., 11/4/1980; US Patent no. 4,198,702 Time Varying Gain Amplifier for Side Scan Sonar Applications, by Peter Clifford, 4/15/1980