Patent ID: 6697628
Filing Date: 2004-02-24
Classification: G01S,H04B

Abstract:
In a radio communication system operable to communicate communication signals upon a common bandwidth, the radio communication system having a network part installed to encompass a geographical area and a mobile station positionable therein, the radio communication system defining a noise floor level upon the common bandwidth, an improvement of apparatus for facilitating determination of geographical positioning of the mobile station, said apparatus comprising:at least a first wideband signal generator for generating at least a first wideband signal for communication upon at least a first channel allocated to at least a first network station upon which to transmit a first signal, the first wideband signal generated during first pseudorandom time periods, together with the first signal and the first wideband signal of a bandwidth greater than a corresponding first-signal bandwidth of the first signal and the first wideband signal of a signal level less than a corresponding first-signal signal strength, and the signal level of the first wideband signal less than the noise floor level; a transmitter coupled to said first wideband signal generator, said transmitter for transmitting the first signal upon the first channel, the first signal used, subsequent to detection at the mobile station, to facilitate the determination of the geographic positioning of the mobile station.