Method and system for telematics location sensing
The present invention provides a method of operating a telematics device within a mobile vehicle communication system to provide a current telematics device geographic location. The method includes receiving odometer information including velocity information for a specified time period, and receiving positional information including velocity information for a specified time period. The method further includes determining a first distance traveled value based on the received odometer information and determining a second distance traveled value based on the received positional information. The method additionally includes selecting one of the first and second distance traveled values as a primary distance traveled value based on predetermined criteria, and determining a current telematics device geographic location based on the primary distance traveled value. The odometer information may include velocity information from a power-train sensor. The positional information may include velocity information from one or more wheel sensors.
1. A method of determining a current telematics device geographic location in the absence of valid GPS data, the method comprising:
receiving first odometer information and second odometer information and receiving positional information, the positional information including velocity information;
determining a first estimated distance traveled value based on the first and second odometer information and determining a second estimated distance traveled value based on the received positional information;
selecting one of the first and second estimated distance traveled values as a primary distance traveled value by comparing the first and second estimated distance traveled values and determining if the difference between the first and second estimated distance traveled values exceeds a predetermined tolerance value; and
determining a current telematics device geographic location based on the selected primary distance traveled value in the absence of valid GPS data.
2. The method of claim 1 , wherein the velocity information is derived from a power-train sensor.
3. The method of claim 1 , wherein the second odometer information is derived from one or more wheel sensors.
4. The method of claim 1 , wherein the determined first estimated distance traveled value is based on a normalized product of the first velocity information and the specified time period included within the odometer information.
5. The method of claim 1 , wherein the determined second estimated distance traveled value includes utilizing Earth Centered Earth Fixed methodology incorporating the received positional information.
6. The method of claim 1 , wherein selecting one of the first and second estimated distance traveled values as a primary distance traveled value further comprises:
selecting the second estimated distance traveled value as the primary distance traveled value when the difference between the first estimated distance traveled value and the second estimated distance traveled value is less than or equal to a predetermined tolerance value; and
selecting the first estimated distance traveled value as the primary distance traveled value when the difference between the first estimated distance traveled value and the second estimated distance traveled value is greater than the predetermined tolerance value.
7. The method of claim 1 wherein selecting one of the first and second estimated distance traveled values as a primary distance traveled value based on a tolerance value further comprises selecting the first estimated distance traveled value when the difference between the first and second estimated distance traveled values exceeds the tolerance value.