摘要:
A system and method for extending the cellular range of communications using a vehicle telematics unit. The system includes the vehicle telematics unit which is connected with other vehicle hardware and includes wireless cellular capability for communicating from the vehicle to a call center or other facilities via a wireless communication system. The method carried out by the system includes identifying a cellular base station in wireless communication with a vehicle telematics unit; attempting an emergency call via the identified cellular base station using the vehicle telematics unit; determining that a forward link portion of a cellular signal between the vehicle telematics unit and the identified cellular base station lacks sufficient strength to place the attempted emergency call; and transmitting emergency communications via the identified cellular base station using a reverse link portion of the cellular signal based on the determination.
摘要:
A system and method of extending the range of a vehicle telematics unit includes determining that a vehicle telematics unit is outside of a geographic range beyond which time division multiple access (TDMA) transmissions sent from the vehicle telematics unit to a base station arrive at the base station after a time slot allocated to the vehicle telematics unit in a time frame has passed; calculating a time delay that causes the TDMA transmissions to arrive at the base station in the allocated time slot of a subsequent time frame; and sending TDMA transmissions from the vehicle telematics unit at a time determined using the time delay.
摘要:
Vehicle telematics systems and methods for vehicle telematics systems are provided. The telematics system includes a first antenna, a second antenna, and a processing device. The first antenna is disposed at a first location on the vehicle. The second antenna is disposed at a second location on the vehicle. The second location is remote from the first location. The processing device is coupled to the first antenna and the second antenna. The processing device is configured to monitor a parameter that is indicative as to whether the first antenna is operational, communicate using the first antenna if the parameter indicates that the first antenna is operational, and communicate using the second antenna if the parameter indicates that the first antenna is not operational.
摘要:
A method of carrying out communications using a vehicle telematics unit includes identifying a cellular base station in wireless communication with a vehicle telematics unit; attempting an emergency call via the identified cellular base station using the vehicle telematics unit; determining that a forward link portion of a cellular signal between the vehicle telematics unit and the identified cellular base station lacks sufficient strength to place the attempted emergency call; and transmitting emergency communications via the identified cellular base station using a reverse link portion of the cellular signal based on the determination.
摘要:
A system and method of extending the range of a vehicle telematics unit includes determining that a vehicle telematics unit is outside of a geographic range beyond which time division multiple access (TDMA) transmissions sent from the vehicle telematics unit to a base station arrive at the base station after a time slot allocated to the vehicle telematics unit in a time frame has passed; calculating a time delay that causes the TDMA transmissions to arrive at the base station in the allocated time slot of a subsequent time frame; and sending TDMA transmissions from the vehicle telematics unit at a time determined using the time delay.
摘要:
Antenna systems and antenna filters are provided, for example for use in a windshield or on a roof of a vehicle. An antenna system comprises a first antenna, a second antenna, and a filter. The first antenna is configured to operate at a first frequency. The second antenna is configured to operate at a second frequency. The filter is coupled to the first antenna. The filter is configured to create an open circuit condition at the second frequency and reduce secondary radiation between the first and second antennas.
摘要:
A method of processing global navigation satellite system (GNSS) data includes identifying one or more GNSS satellites servicing a predefined area, receiving at least one of GNSS almanac data or space-based augmentation system (SBAS) data for the satellites servicing the predefined area, determining the performance of the GNSS satellites servicing the predefined area using the almanac data or SBAS data, and applying a performance rating to the predefined area based on the performance of the GNSS satellites.
摘要:
A multifunctional vehicle antenna assembly that includes a primary multiple input and multiple output (MIMO) antenna component; a secondary MIMO antenna component; and a global navigation satellite system (GNSS) antenna component, wherein the GNSS antenna component is located between the primary MIMO antenna component and the secondary MIMO antenna component and is located nearer to the secondary MIMO antenna component.
摘要:
A multifunctional vehicle antenna assembly that includes a primary multiple input and multiple output (MIMO) antenna component; a secondary MIMO antenna component; and a global navigation satellite system (GNSS) antenna component, wherein the GNSS antenna component is located between the primary MIMO antenna component and the secondary MIMO antenna component and is located nearer to the secondary MIMO antenna component.
摘要:
A method of processing global navigation satellite system (GNSS) data includes identifying one or more GNSS satellites servicing a predefined area, receiving at least one of GNSS almanac data or space-based augmentation system (SBAS) data for the satellites servicing the predefined area, determining the performance of the GNSS satellites servicing the predefined area using the almanac data or SBAS data, and applying a performance rating to the predefined area based on the performance of the GNSS satellites.