Search All Patents in Smart Cities: V2X
Patent US10591608
Issued 2020-03-17
Positioning Quality Filter For The V2x Technologies
This provides methods and systems for V2X applications, such as forward collision warning, electronic emergency brake light, left turn assist, work zone warning, signal phase timing, and others, mainly relying on a GNSS positioning solution transmitted via the Dedicated Short-Range Communications (DSRC) to/from the roadside units and onboard units in other V2X-enabled vehicles. However, the positioning solution from a GNSS may be deteriorated by noise and/or bias due to various error sources, e.g., time delay, atmospheric effect, ephemeris effect, and multipath effect. This offers a novel quality filter that can detect noise and the onset of drift in GNSS signals by evaluating up to four metrics that compare the qualities of kinematic variables, speed, heading angle change, curvature, and lateral displacement, obtained directly or derived from GNSS and onboard vehicle sensors. This is used for autonomous cars and vehicle safety, with various examples/variations.
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- 1. A method for positioning quality filter for a global navigation system for a vehicle, said method comprising:
a central computer receiving global positioning system location data; said central computer receiving sensors data from vehicle sensors; said sensors data from said vehicle sensors comprises data from a vehicle speed sensor, a vehicle direction sensor, and a vehicle yaw rate sensor on said vehicle; said central computer calculating a first metric value based on said sensors data from said vehicle sensors, based on said vehicle speed, said vehicle direction, and said vehicle yaw rate; a processor receiving a first threshold; said processor comparing said first metric value with said first threshold; after determining that said first metric value is larger than or equal to said first threshold, said processor receiving a second threshold;
a) said central computer calculating a second metric value;
b) said processor comparing said second metric value with said second threshold;
c) after determining that said second metric value is smaller than said second threshold, said processor receiving a third threshold;
a. said central computer calculating a third metric value;
b. said processor comparing said third metric value with said third threshold;
c. after determining that said third metric value is larger than or equal to said third threshold, said processor receiving a fourth threshold;
a. said central computer calculating a fourth metric value;
b. said processor comparing said fourth metric value with said fourth threshold;
c. after determining that said fourth metric value is smaller than said fourth threshold, said processor setting said global navigation system value as valid;
said central computer validating said global positioning system location data 9 using said global navigation system value, for safety, operation, or navigation of said vehicle; said central computer sending a notice to a vehicle warning device; said central computer correcting a navigation of said vehicle; said central computer adjusting direction of said vehicle.
