Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1993-08-11
1996-05-07
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342418, 342352, G01S 302, G01S 352, H04B 7185
Patent
active
055150624
ABSTRACT:
A location system relies upon a non-coherent, FDM/TDM communication scheme to measure location parameters. A locator unit moves relative to the locatable unit. A series of messages are communicated between the locator unit and the locatable unit. Through feedback provided from the locator unit to the locatable unit, the locatable unit adjusts its reference frequency and time base so that signals it transmits arrive at the locator unit on a desired frequency and at a desired time slot. The locatable unit estimates Doppler and propagation duration and transmits the estimates to the locator unit. The locator unit measures offsets between desired frequencies and time slots and actual frequencies and time slots. The offsets are combined with the locatable unit's estimates of Doppler and propagation duration to form an integrated Doppler parameter and an integrated propagation duration parameter. The integrated Doppler and propagation duration are used to determine location.
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"Geolocation of Frequency-Hopping Transmitters via Satellite" by A. Sonnenschein and W. K. Hutchinson from Technical Report 900, Nov., 1990.
"Geolocation via Satellite: A Methodology and Error Analysis" by M. J. Shensa from Technical Report 1244, May 1988.
Attwood Stanley W.
Maine Kristine P.
Olds Keith A.
Hall Philip E.
Handy Robert M.
Issing Gregory C.
Johanson Kevin K.
Motorola Inc.
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