VEHICLE POSITIONING FOR ROAD SAFETY

 

The positioning of a vehicle using GPS is marred by availability problems (areas without GPS coverage such as tunnels, underground car parks) or by significant positioning errors (particularly around urban areas causing reflection of GPS paths).

 

For road safety purposes, for instance collision avoidance, GPS is unsufficient.

 

SYSNAV’s trusted navigation solution provides reliable and always-available positioning through a set of complementary sensors that constitute a tactical grade inertial navigation system. The system avoids all typical positioning issues: overshooting, positioning delay, unavailability (indoor or underground).

 

THE TECHNOLOGY BEHIND SYSNAV BLUEFORCE

 

The principle of dead reckoning navigation is that the distance traveled at each instant is projected into the local geographic axes (Up / Down, North / South, East / West). The distance traveled is obtained from the merged measurements of several sensors:

  • accelerometers, gyroscopes and magnetometers (Magneto-Inertial Measurement Unit)
  • Data from the wheel odometer

This redundancy ensures continuity of service and exceptional operational reliability. The heading is obtained from the navigation algorithm which uses the angular speeds measured by the gyroscopes and the aforementioned speed measurements. A Kalman filter supervises the data set and produces parameters used to derive the uncertainty on the estimated position.

 

VEHICLE POSITIONING WITH METER ACCURACY AND HIGH AVAILABILITY

 

SYSNAV’s BLUEFORCE inertial navigation solution excels in reliability, availability and precision.

When operating autonomously without GPS, the system delivers a solution with an accuracy of around 1% of the distance traveled. An accuracy of 5m is guaranteed at all times in nominal mode, even during loss or unreliability of the GPS signal for a certain time.

To compensate for this derivation, the GPS is used by the filter as a repositioning means. The GPS measurement, when available, is compared to the navigation solution developed by the filter and is taken into account depending on the estimated quality of the reception and multiple paths encountered. Both hot and cold start positionings are instantly available, especially for the use of vehicles parked indoors.

 

SYSNAV’s BLUEFORCE meets  airport ground vehicle requirements set as part of A-SMGCS (Advanced Surface Movement Guidance and Control System) with a very strong price/performance ratio.

 

APPLICABLE SCENARIOS