Abstract: A system and method of controlling communication between a satellite transceiver and a ground transceiver, where the satellite transceiver is configured to receive concurrently a plurality of messages at substantially the same carrier frequency from a plurality of ground transceivers. The satellite transceiver transmits a ranking threshold indicative of a transmit power that a ground transceiver is authorized to use to transmit a message. The ground transceiver receives the ranking threshold transmitted by the ground transceiver, and determines a transmit power of the transmitter to transmit a message based on a comparison of the ranking threshold and a transceiver ranking of the ground transceiver.

Abstract: A system and method of controlling communication between a satellite transceiver and a ground transceiver, where the satellite transceiver is configured to receive concurrently a plurality of messages at substantially the same carrier frequency from a plurality of ground transceivers. The satellite transceiver transmits a time reference signal. The ground transceiver receives the time reference signal, and determines a transmit time that the ground transceiver is authorized to transmit a message based on an identification number of the ground transceiver.

Abstract: Multiple receivers may be enabled to receive satellite-based digital audio radio (SDAR) services under a single subscription. For example, an SDAR service provider can enable multiple vehicles, a home-based digital radio, or a portable digital radio, singly or in any combination. Multiple receivers transmit information to each other. One receiver is designated as a primary receiver, and the other receivers are designated as secondary receivers. The SDAR service provider transmits a list of associated secondary receivers to the primary receiver. The primary receiver enables the associated secondary receivers to receive SDAR services by placing them in an authorized state. The secondary receivers must periodically communicate with the primary receiver to remain authorized. A secondary receiver that fails to communicate with the primary receiver within a prescribed time period is switched to an unauthorized state. In this unauthorized state, the secondary receiver no longer performs as an authorized receiver.

Abstract: The present invention generally relates to the transmission of GPS reference information, and more particularly, to transmission of GPS ephemeris information for mobile applications. A Telemetry word data is provided by and/or transmitted by a non-cellular, land based network and received by a receiver. A location signal is computed by a processor and transmitted to the GPS receiver. An accumulator accumulates that data and stores it in a data base. The unit may be connected to a Public Safety Answering Point. Also, the present invention provides a method to assist the GPS in mobile applications where the user does not necessarily have a cellular phone. The present invention discloses a method of transmitting ephemeris data to assist the GPS receiver without relying on the cellular telephone network.

Abstract: A technique for providing secondary data in a single frequency network (SFN) provides a first forward error correcting (FEC) decoder for decoding a received coded orthogonal frequency division multiplex (COFDM) signal. A second FEC decoder is also provided for decoding a received COFDM signal. When the received COFDM signal includes valid primary data, the first FEC decoder is utilized to decode the received COFDM signal to provide general information, i.e., music, sports, etc. When a received COFDM signal includes valid secondary data, the second FEC decoder is utilized to decode the received COFDM signal to provide regional information, e.g., emergency broadcasting information. The received COFDM signal includes one or more defined COFDM symbols inserted by a transmitter of the COFDM signal to indicate the valid secondary data and the invalid primary data.

Abstract: A satellite antenna module is disclosed. The satellite antenna module includes at least one antenna element disposed on a ground plane. The ground plane is capacitivly coupled to a vehicle surface. The ground plane is disposed over the vehicle surface at an elevation angle that achieves a higher gain of the at least one antenna element.