Abstract: An on-board unit for a vehicle is disclosed. The unit includes a primary communication system, the primary communication system being adapted to communicate with a remote location, and being further adapted to detect a stolen condition or receive an indication of a stolen condition. The unit also includes a process for determining whether communication with a central location can be effected. A secondary communication system is provided, the secondary communication system transmitting a signal including an identification of the on-board unit when communication with the central location cannot be effected. This signal is received by a receiver, which is in direct or indirect communication with the central location, so that the central location can take the appropriate steps to recover the vehicle which includes the on-board unit that is emitting the signal.

Abstract: The present invention is a system and method for detecting a jamming signal. The signal is detected by analyzing a spectrum of PCS, wireless network and pager wavebands (or, in other words, any wireless network) and by looking for unusual patterns. If unusual patterns are found, it is considered that a jammer is present. In a preferred embodiment of the invention, the system can be aboard a recovery vehicle, or be an integral part of an on-board unit on a vehicle.

Abstract: A system for tracking an object being provided with a tracking wireless transceiver and a positioning system in communication with the tracking wireless transceiver is disclosed. The system includes a receiver for receiving an indication that the object needs to be tracked; a pager for paging the tracking wireless transceiver; and a trigger for activating the positioning system, so that the positioning system obtains preliminary positioning information from the positioning system and relays the preliminary positioning information to the tracking wireless transceiver. The tracking wireless transceiver sends the preliminary positioning information to a central location. The system also includes a beacon for emitting a signal, which is activated when the tracking wireless transceiver has been paged.

Abstract: The present invention concerns a method and a system for tracking an object, person or animal, the object, person or animal being provided with a tracking wireless transceiver. The system includes a receiver for receiving an indication that the object, person or animal needs to be tracked; a wireless radio link for wirelessly communicating with the tracking wireless transceiver; a device for estimating coordinates of the object, person or animal based on a location of one or more sites communicating with the tracking wireless transceiver; and at least one wireless device provided with the object, person or animal, for wirelessly communicating with the tracking wireless transceiver. The present invention can be useful for communicating with the object, person or animal to be tracked, and is a more flexible system over the prior art systems.

Abstract: An improved system for locating a stolen vehicle or the like is disclosed. The system includes a hidden transceiver such as a cellular transceiver and a positioning device such a GPS antenna and chipset located apart from the transceiver. To avoid disclosure of the location of the transceiver by following wires, the positioning device and the transceiver are in wireless communication with each other.

Abstract: A vehicle tracking method and system using the cellular network infrastructure is disclosed. A cellular transceiver which is installed in a vehicle that requires tracking, operates on a continuous standby mode to remain constantly accessible to the cellular security provider. The cellular transceiver is turned to an active mode when tracking of the vehicle is initiated. The general location of the stolen vehicle can be determined by paging the cellular transceiver located in the stolen vehicle to identify one or more cell sites located near the stolen vehicle. The information is then relayed to a tracking vehicle which makes use of a radio direction finder to obtain an accurate bearing on the location of the stolen vehicle.