Automaker Uses Ashtech Receivers to Test New Models
August 24, 2010
Figure 1
Czech automaker Skoda has selected Ashtech ProFlex 500 GNSS receivers to measure the dynamic movements of its new models as they accelerate through high-speed tight test maneuvers at the company’s development facility in Mlada Boleslav, Czech Republic.
As a test driver executes a sequence of close loops at high acceleration and speed, two on-board ProFlex 500 GNSS receivers receive and transmit continuous observations of the dynamic transverse movement of the vehicle. Each receiver is connected to its own rooftop-mounted GNSS antenna, which is precisely oriented along the car’s longitudinal axis (Figure1). To provide real-time centimeter accuracy positioning, the GNSS receivers are also connected via UHF to a third ProFlex 500 GNSS reference station that broadcasts instant real-time corrections. The Ashtech receivers were integrated in an intricate high technology testing system, using complementary sensors such as inertial gyroscopes and speed indicators on each wheel of the vehicle.
During the tests, the driver goes to the limits of the car, executing a sequence of tight loops at high acceleration and speed (Figure 2). The accurate plot of the car trajectory can only be obtained with a high rate of position output. An efficient way of sustaining this high-position fast output rate was to provide the two on-board ProFlex 500 receivers with base corrections in compact AshTech Optimized Messaging (ATOM) format through a UHF radio link. Through its integrated UHF receiver, Ashtech ProFlex 500 delivers position updates at 20 Hz (20 measurements per second).
Ashtech’s proprietary compact ATOM format ensures the data is delivered quickly with no memory buffer overflow. In addition to the fast update delivery rate, Skoda selected the ProFlex 500 for its drop-out free stability, precision, and rugged construction. Technical support for GNSS hardware tuning and integration was provided by Ashtech and Geoobchod, its local dealer.
Figure 2
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