Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1997-03-24
1999-12-14
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342453, 342463, 375343, 375347, 375349, G01S 502
Patent
active
060023619
ABSTRACT:
Method and apparatus for improving the accuracy of a received composite signal s(t) that contains a known reference signal S.sub.d (t) with a known bit transition period .DELTA.tchip and that may contain a multipath signal S.sub.m (t;.chi.;b) with an unknown multipath time delay b and an unknown multipath gain factor .chi. (-1.ltoreq..chi..ltoreq.1). Autocorrelation functions AC(.tau.) and AC(.tau.;d) for the incoming signal and for the reference (direct) signal are determined, dependent upon a time shift variable .tau., and a double difference autocorrelation function .DELTA..DELTA.AC(.tau.)=AC(.tau.)-AC(.tau.-.tau.LE)-AC(.tau.;d)+AC(.tau.-. tau.LE;d) is formed, where .tau.LE is a selected time shift displacement satisfying 0 <.tau.LE.ltoreq..DELTA..tau..sub.chip. Two integrals or sums of .DELTA..DELTA.AC(.tau.) are measured over different selected time shift intervals. The ratio of these two integrals or sums provides a quadratic equation in the time delay variable b that is solved for b. The gain factor .chi. is obtained from a ratio of integrals or sums of another ratio involving .DELTA..DELTA.AC(.tau.). A multipath signal, if present, is approximated by S.sub.m (t;.chi.;b).apprxeq..chi.S.sub.d (t-b) and can be removed from the incoming signal to provide an incoming signal with improved accuracy.
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Phan Dap L.
Schipper John F.
Tarcza Thomas H.
Trimble Navigation Limited
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