| Patent application number | Description | Published |
|---|
| 20090005985 | GPS-based in-vehicle sensor calibration algorithm - A system and method for calibrating the bias and scale factors of a heading rate sensor, such as a yaw-rate sensor, using GPS signals. The system receives wheel speed or rotation signals, a vehicle odometer reading, GPS signals and yaw-rate signals. The system includes a wheel-slip detection processor that determines whether there is wheel-slip based on the wheel speed signals and the GPS signals. The system also includes a wheel-based acceleration processor that estimates vehicle acceleration. The system also includes a differential odometry processor that determines vehicle heading based on wheel speed. The system also includes a GPS reference data validation processor that determines whether the GPS signals are valid using the estimated vehicle acceleration and wheel speeds. The valid GPS signals are then used to calibrate the yaw-rate sensor signals, which can be used for vehicle heading purposes. | 01-01-2009 |
| 20090265054 | IN-VEHICLE SENSOR-BASED CALIBRATION ALGORITHM FOR YAW RATE SENSOR CALIBRATION - A system and method for calibrating a vehicle heading sensor, such as a yaw-rate sensor, when GPS signals are not available using a bias update model that employs a bias gain factor. In order for the bias update model to be accurate, the vehicle should be traveling relatively straight. One embodiment of the present invention uses three thresholds to determine if the vehicle is traveling straight. These thresholds include a yaw-rate threshold, a steering wheel angle threshold and a wheel speed threshold. If all three of the thresholds indicate that the vehicle is traveling straight, then the update bias model can be used to calibrate the yaw-rate sensor. | 10-22-2009 |
| 20090271112 | DEDICATED SHORT RANGE COMMUNICATION (DSRC) SENDER VALIDATION USING GPS PRECISE POSITIONING TECHNIQUES - A system and method for authenticating a message transmitted in a vehicle-to-vehicle communications system. The sending vehicle will attach raw GPS data to a transmitted message it receives from GPS satellites that the sending vehicle uses to determine its own position. The transmitted message will also include the position of the sending vehicle that the sending vehicle has determined using the GPS data. The receiving vehicle will use the raw GPS data in the message and an RTK process to determine the position of the sending vehicle. The receiving vehicle will compare the position of the sending vehicle in the message with the position of the sending vehicle determined from the GPS data, and if they match, will authenticate the received message. | 10-29-2009 |
| 20100164789 | Measurement Level Integration of GPS and Other Range and Bearing Measurement-Capable Sensors for Ubiquitous Positioning Capability - A system and method are provided for determining a position of a host vehicle using a real time kinematics positioning technique when less than an optimal number of satellites are available for determining the position of the host vehicle. GPS data is retrieved from the host vehicle. GPS data is retrieved from vehicles remote from the host vehicle. Alternative vehicle position related data is retrieved. The position of the host vehicle is determined utilizing the real time kinematics positioning technique as a function of the retrieved GPS data of the host and remote vehicles and the alternative vehicle position data. The position of the host vehicle is utilized in a vehicle application. | 07-01-2010 |
| 20110068976 | METHOD AND APPARATUS FOR ACCELERATING THE PROCESS OF DETERMINING A GEOGRAPHIC POSITION - Methods and apparatus are provided for accelerating the process of determining a geographic position. The method includes, but is not limited to activating a satellite navigation device that is configured to receive a satellite communication signal and to receive a wireless communication signal. The method also includes receiving the wireless communication signal from a local portable wireless device using the satellite navigation device. The wireless communication signal contains satellite related data. The method also includes calculating, with the satellite navigation device, the geographic position of the satellite navigation device using the satellite related data received from the portable wireless device. | 03-24-2011 |
| 20110109475 | Travel Lane Advisor - A traffic flow advisory system includes a locating device for identifying a position of a driven vehicle. A communication device exchanges vehicle position data, speed data, and heading data with remote vehicles. A processor constructs a traffic flow rate in a plurality of road lanes based on the position data and speed data. A human machine interface indicates to a driver of the driven vehicle the traffic flow rate of each of the road lanes. | 05-12-2011 |
| 20110144911 | METHOD OF PROCESSING GLOBAL NAVIGATION SATELLITE SYSTEM DATA - 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. | 06-16-2011 |
