Ranging between radios using pseudo time of arrival sequence

Details Ranging between radios using pseudo time of arrival sequence Ranging between radios using pseudo time of arrival sequence

2011-03-01

2011-03-01

Juntima, Nittaya (Department: 2462)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C455S456100

Reexamination Certificate

active

07899085

ABSTRACT:
Systems and methods for refining the determination of the time of arrival (TOA) of given data. A portion of packet data is designated to be used as a pseudo TOA sequence. The packet information is modulated using, e.g., BPSK, and thereafter spread with a chipping stream known at both source and destination radios. The resulting stream includes a TOA reference pattern. On the receive side (destination radio), receive samples are despread and demodulated. The despread data is then XOR'ed with the chipping stream to re-create the TOA reference pattern. The re-created TOA reference pattern and original receive samples (previously stored) are passed through a correlator to obtain a correlation profile, which is then used for curve fitting/interpolation to accurately determine the TOA of the given received sample. Embodiments may be used in conjunction with a radio ranging system.

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