Accession Number : ADD017429

Title :   System and Method.

Descriptive Note : Patent, Filed 19 Dec 89, patented 17 Jan 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Blume, Richard J

Report Date : 17 Jan 1995

Pagination or Media Count : 8

Abstract : An improved system and method for detecting and positively identifying with enhanced IFF techniques an object or target from an interrogator platform where the area outwardly of and about the platform is suitably surveyed for detecting an object and where the platform is on the earth's surface, in the air or space so long as the platform and detected object to be identified are both within the envelop defined by the Global Position System (GPS) or the like. The system for carrying out the method can be generally made up of a GPS receiver, a programmed central processor unit and combined transceiver/antenna means. The GPS receiver of any platform after detecting an object advantageously functions to obtain the platform geoposition. Then by suitable means or by the cooperation of the programmed processor and antenna means obtain the bearing of the detected object. The detected object is then interrogated with an encrypted IFF signal as to the estimated position of the detected object. The signal also includes a region of uncertainty about the estimated position to assure positive object identification Although the improved system has extensive military applications, it may readily be used for peaceful purposes. Because signal directivity is not required, an antenna of simple omnidirectional design may be used for any platform and object as well as any set of different frequencies for interrogating and receiving a response to the interrogation.

Descriptors :   *GLOBAL POSITIONING SYSTEM, *PATENTS, SIGNAL PROCESSING, TARGETS, IDENTIFICATION, PLATFORMS, POSITION FINDING, NAVIGATION SATELLITES, MILITARY APPLICATIONS, RANGE FINDING, RADIO TRANSMISSION, INTERROGATORS

Subject Categories : Navigation and Guidance
      Target Direction, Range and Position Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE