Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1997-01-13
1999-08-31
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
455456, G01S 302, H04M 1100
Patent
active
059459492
ABSTRACT:
Methods and apparatus for determining mobile station position in a wireless communication system are disclosed. A mobile station of the wireless system includes a silent echo generation circuit which receives a transmit time stamp transmitted in a sync channel from a base station, and processes the transmit time stamp to generate a receive time stamp. The silent echo generation circuit transmits the receive time stamp back to the base station on a spurious-like echo carrier which is offset from a data carrier of the wireless system. The base station processes the transmit and receive time stamps to compute a first ranging value, receives corresponding second and third ranging values computed by two other system base stations which receive the echo carrier and its time stamp, and processes the first, second and third ranging values to determine a position vector indicative of the position of the mobile station. The base station then further processes the position vector to determine a bearing for the vector, and converts the result into latitude and longitude coordinates of the mobile station position. The silent echo generation circuit provides mobile position determination capability in the wireless system without significantly increasing the cost, size, weight and power consumption of the mobile station, without requiring a multilayer user interface, and without degrading system voice quality.
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M. Wylie et al., "The Non-Line of Sight Problem in Mobile Location Estimation," ICUPC '95, Boston, MA, 1995.
J. Caffery et al., "Radio Location in Urban CDMA Microcells," Proceedings of PIMRC '95, pp. 858-862, IEEE, 1995.
Issing Gregory C.
Lucent Technologies - Inc.
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