David M. Deveau
Lynn F. Carlton
Naval Undersea Warfare Ctr. Range Development Div., B104/Code 3822, Newport, RI 02841
Peter J. Stein
Scientific Solutions, Inc., Nashua, NH 03062
Here is presented an overview of the target response measurement system (TRMS) deployed at the NUWC Seneca Lake test facility. This system is capable of measuring the target strength of objects at ranges from 10 to 300 m. The frequency range for monostatic measurements is from 300 Hz to 400 kHz. The current bistatic capability is measurements every 5(degrees) over a 90(degrees) window from 2 to 15 kHz. A multichannel PC-based digital data-acquisition system has been developed which includes high-speed A/D boards, baseband translation, and real-time monitoring of TS as a function of target aspect angle. Target aspect angle and acoustic source signatures are measured at the target and telemetered to the acquisition for digital storage along with the acoustic data. Accuracies of 1 dB in TS and 1(degrees) resolution in target aspect angle are possible. Measurements are generally clutter limited to a target strength less than -30 dB re: 1 m. Clutter of the target harness is usually a major issue and is discussed. The target strength of various targets and support structures is presented.