Abstract: A network of non-cooperative integrated pseudolite (PL)/satellite base station (SBS) transmitters covering an open area. The network comprises a first plurality (K) of integrated pseudolite/satellite base station (PL)1/(SBS) transmitters, located in an open area A, and a second plurality (M) of non-cooperative integrated PL2/SBS transmitters, located in an open area B. K and M are integers. Each PL transmitter is co-located with one SBS. Each SBS provides a satellite timing synchronization signal. Each integrated active (transmitting) PL/SBS transmitter transmits its position location as a part of its message. The first plurality (K) of integrated PL1/SBS transmitters includes a substantially sufficient number of active integrated PL1/SBS transmitters in order to fill out satellite shades of coverage and to substantially cover the area A. Each integrated PL2/SBS transmitter continuously detects a plurality of ranging signals transmitted by each active integrated PL1/SBS transmitter.

Abstract: An integrated split-spectrum pseudolite/satellite base station (SS-PL)/SBS transmitter comprising a satellite base station and a split-spectrum pseudolite (SS-PL) transmitter co-located with the satellite base station. The satellite base station provides a timing synchronization signal. The satellite base station also provides a self-surveying capability for the split-spectrum pseudolite (SS-PL). The split-spectrum pseudolite (SS-PL) generates a split-spectrum sideband signal that minimizes interference with the reception of at least one satellite signal by the satellite base station.

Abstract: A pseudolite translator apparatus and method for using a pseudolite translator. In one embodiment, a pseudolite translator includes a receiver which is adapted to receive position information having a first frequency. The position information is transmitted from a pseudolite. In the present embodiment, the first frequency at which the position information is transmitted from the pseudolite is an unlicensed frequency. A frequency converting processor of the translator converts the position information having the first unlicensed frequency to position information having a second frequency. The translator also contains an output unit which is coupled to the frequency converting processor. The output unit is adapted to communicate the position information having the second frequency to a position determining device.

Abstract: Several fixed-location pseudolites transmit coordinates of their respective positions to a local area navigation receiver. The respective position and range information to each pseudolite are used to compute the position of the receiver. The pseudolites transmit on frequencies exempt from licensing requirements at power levels under one watt and use spread spectrum communication and pseudo random number codes similar to the global positioning system operated by the United States Government.

Abstract: A GPS satellite receiver is disclosed in which the frequency of the received satellite signal is down converted in a single step by a balanced mixer driven by a half-frequency local oscillator and the down-converted satellite signal is converted from analog-to-digital form by a hard limiter.