초록 ▼

The surveillance system provides a means to measure Time Difference of Arrival (TDOA) and decode identification of signal source transmissions. TDOA and identification information received from a minimum of two receiving means is used to supplement non-cooperative surveillance systems (e.g., primary

The surveillance system provides a means to measure Time Difference of Arrival (TDOA) and decode identification of signal source transmissions. TDOA and identification information received from a minimum of two receiving means is used to supplement non-cooperative surveillance systems (e.g., primary radar, acoustic sensors) with target identification. The system uses a Line Of Position technique to determine position. The system can be implemented as a standalone multilateration surveillance system, which provides signal source position determination when reception is available from a minimum of two receiving means. The system provides position aiding when implemented to supplement non-cooperative surveillance systems.

대표청구항 ▼

[ I claim:] [1.] A system for determining the line of position and identification of a minimum of one signal source, said system comprising:(a) a plurality of at least two fixed ground stations, each containing a means for receiving the signal transmissions from the mobile signal source, the receivi

[ I claim:] [1.] A system for determining the line of position and identification of a minimum of one signal source, said system comprising:(a) a plurality of at least two fixed ground stations, each containing a means for receiving the signal transmissions from the mobile signal source, the receiving means being located very precisely at known coordinates (x.sub.1,y.sub.1,z.sub.1) and (x.sub.2,y.sub.2,z.sub.2), means for measuring precisely time of arrival of the source signal transmissions, means to decode the address contained in a source signal transmission, and means for time synchronizing said ground stations;(b) a data communications link for transmitting time of arrival and associated source signal address from each time of arrival measuring/signal decoding means to a central data processor;(c) a surveillance/identification processor for computing time difference of arrival using the time of arrival and associated source signal address data received from the ground station means, computes line of position when a signal sources transmissions is received by two receiving means, computes 2 dimensional multilateration position (x, y) when a signal source transmission is received by three receiving means, computes 3 dimensional multilateration position (x,y,z) when a signal source transmission is received by a minimum of four receiving means, provides identification of targets detected by any second surveillance system by correlating system measured time difference of arrival/source signal address to the second surveillance system target data, provides position aiding of any 2 dimensional and 3 dimensional position using system provided line of position from the source transmissions.