The sigint sensor for shiplaunched rpv's will 1) provide lowcost communication intercept capability, to detect, analyze, and geolocate enemy communications; 2) jam selected enemy communications; and 3) emulate u.s. naval communications to decoy enemy forces. this equipment, based on several existing… More

A sonobuoy on the bottom of the ocean can achieve long detection ranges by use of the reliable acoustic path (rap). by putting an acoustic signal processor in the buoy to do spectrum analysis and contact report generation, the data transmitted to surveillance aircraft can be reduced to short bursts… More

There is an increasing need for long range (200km) approximately 10 bps rate acoustic communication at low bit error rates in the command and control of acoustic surveillance system elements, underwater vehicles and sensors. simulated fish noise, coded tone and multitone cw signals have been used… More

Command in groundd combat involves many difficult decision-making tasks. a highly promising route for assistance tothe commander is useof computers. by 1985-87 great computational power will be available in lap-sized machines; however, substantial advances in software are necessary if this promise… More

Defense systems, inc. proposes to design, develop, and test a prototype causal schema expert system decision aid for tactical planning and option-generation. this project will focus on weapon target planning options, a problem domain where a number of smart decision aids are available. none of the… More

Data recovery from operational asw buoys now requires the presence of a p-3 or s-3 aircraft. satellite relay capability exists, but the average bit rate is too low, and it is not real time. we propose the development of a real time one watt kilobit per second hf sur face wave system for buoys with a… More

To overcome shortcomings of asw weaponry, nosc plans a tech base program in support of high potential advanced asw weapons concepts. numerous candidates are available in each of the significant areas of propulsion, warheads, guidance, quieting and non-torpedo concepts. there is a need for a… More

Automatic direction finding on uhf communication frequencies is an essential military capability now performed by tuning a receiver to the communication frequency and obtaining a sine/cosine component of the output of directional antennas which, when compared, provide the bearing to the target. this… More

Present data recovery from asw buoys requires the presence of p-3 aircraft. alternatively, some satellite data readout capability exists, but tidbit rate per satellite pass is toolow, and it is not real time. we proposethe development of a real time 2000 mile hf data link for remote buoys. a… More

The objective of this phase i project is to construct and deliver a "brassboard" fourier transform spectrum analysis processor for magnetic field instruments having a bandwidth of 0-10 hz. it will be designed to operate at a power consumption of less than 1 w and incorporates extensive… More

There is need for a compact underwater buoyancy system capable of maintaining a specified (about 10 lb) weight at any preset water depth from 0 to 2,000 ft. it would be used in expendable sonobuoys where hydrophones or transducers must be kept at a preset depth. defense systems inc. (dsi) proposes… More

While large, complex and expensive satellite systems will remain the only means to achieve many mission requirements miniature satellites have demonstrated the capability to replace large systems for certain applications. miniature satellite technology (mst) lowers cost by reducing satellite… More

Available data indicates that placing geophone sensors 30-100 meters in the seabed provides substantial improvement in signal-to-noise ratio, to recover lost detection range against quieter submarines. a need exists for a seabed penetrating sensor system operating at low frequencies, capable of… More

Defense systems, inc. (dsi) has played a significant role in pioneering the use of the get away special to launchlow cost free flyers with the development of the global low orbiting message relay (glomr) satellite launched in october 1985. to expand the use of low cost access to space for a variety… More

The acoustic charge transport (act) device is a relatively new component, fabricated in monolithic form on gaas, that offers tremendous potential for current/future signal processing systems. because of its newness, little systems application work has been performed to-date. the areas of greatest… More

A concept for using sideband modulations to create a monopulse like guidance signal suitable for use by a missile in flight is presented. this approach offers advantages over a true monopulse which include: very low cost/simple on-board receiver; reduce multi-path problems due to low angle clutter;… More

Radio relays installed on elevated platforms such as kites and balloons can extend line-of-sight vhf and uhf communicatios range beyond the horizon. these relays must be lightweight, operate for several hours on self-contained batteries, and, because they are expendable items, be low cost. a… More

Ground radars and other spacecraft support systems which transmit microwave radiation may produce electric field strengths in excess of those specified in mil-std-461. these high electric field strengths can damage or reduce the reliability of spacecraft and electronic systems before and during… More