Patent ID: 6473032
Filing Date: 2002-10-29
Classification: G01S,H04B

Abstract:
A network of non-cooperative integrated pseudolite (PL)/satellite base station transmitters covering an open area, said network comprising:a first plurality (K) of integrated pseudolite/satellite base station (PL)1/(SBS) transmitters, K being an integer, located in an open area A, each said PL1 transmitter being co-located with one said SBS; wherein each said SBS provides a satellite timing synchronization signal; and wherein each said PL has a predetermined duty cycle; and wherein each said integrated active/transmitting PL1/SBS transmitter transmits its position location as a part of its message; and wherein said first plurality (K) of integrated PL1/SBS transmitters includes a substantially sufficient number K1 of active integrated PL1/SBS transmitters in order to fill out satellite shades of coverage and to substantially cover said area A so that a first mobile navigation/positioning receiver located in said area A receives a substantially sufficient number of ranging signals for its navigation/positioning purposes including K1 ranging signals from said first plurality of PL1/SBS transmitters; K1 being an integer less or equal to K; and a second plurality (M) of non-cooperative integrated PL2/SBS transmitters, M being an integer, located in an open area B, each said PL2 transmitter being co-located with one said SBS; wherein each said SBS provides a satellite timing synchronization signal; wherein each said active integrated PL2/SBS transmitter transmits its position location as a part of its message; wherein each said integrated PL2/SBS transmitter continuously detects a plurality (K2) of ranging signals transmitted by each said active integrated PL1/SBS transmitter; K2 being an integer less or equal to K1; each said integrated PL2/SBS transmitter includes a processor including an algorithm comprising at least the following logic: each said integrated PL2/SBS transmitter does not transmit if said plurality (K2) of active integrated PL1/SBS transmitters substantially covers said area B so that a second mobile navigation/positioning receiver located in said area B receives substantially sufficient number of ranging signals for its navigation/positioning purposes including K2 ranging signals from said first plurality of non-cooperative integrated PL1/SBS transmitters; at least a plurality (M1) of integrated PL2/SBS transmitters starts transmitting, M1 being an integer less or equal to M, if a plurality (K3) of integrated PL1/SBS transmitters does not substantially cover said open area B, K3 being an integer less or equal to K1, so that said second mobile navigation/positioning receiver located in said area B receives substantially sufficient number of ranging signals for its navigation/positioning purposes including M1 ranging signals from said second plurality of non-cooperative PL2/SBS transmitters and including K3 ranging signals from said first plurality of non-cooperative integrated PL1/SBS transmitters.