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ApplicationNo. 363289 filed on 12/22/1994
US Classes:342/457Land vehicle location (e.g., bus, police car
ExaminersPrimary: Blum, Theodore M.
Attorney, Agent or Firm
Foreign Patent References
International ClassG01S 003/02
AbstractPosition determining apparatus including at least one base transmitter/receiver (BTR) station including a base transmitter which periodically transmits timing signals and a plurality of mobile transmitter/receivers (MTR). Each MTR includes a mobile receiver operative to receive timing signals transmitted by at least one base transmitter; synchronization circuitry receiving the timing signals and providing a spread-spectrum frequency-hopping sequence characteristic of the particular MTR; and a mobile transmitter producing a radiated frequency hopped signal responsive to the frequency-hopping sequence and the timing signal.