P-code-aided global positioning system receiver

Parallel-processing, optical distance-measuring device

Parametric array doppler sonar apparatus

Parametric frequency division

Partial probe mapping

Partial search carrier-phase integer ambiguity resolution

Passenger, baggage, and cargo reconciliation system

Passive acoustic aquatic animal finder apparatus and method

Passive airborne collision warning device and method

Passive aircraft proximity indicating system responsive to...

Passive aircraft proximity indicating system which adapts...

Passive coherent location system and method

Passive optical range simulator device

Passive radar responder

Passive rangefinder

Passive ranging method and apparatus

Passive ranging of an airborne emitter by a single...

Passive secondary surveillance radar (ssr)system utilizing...

Passive secondary surveillance radar using signals of remote...

Passive sonar transducer arrangement