Precision GNSS used for new models security and performance analysis
Mlada Boleslav, Czech Republic (August 24, 2010) — Skoda, the Czech auto maker, has selected precision Ashtech® ProFlex™ 500 GNSS receivers to measure the dynamic movements of its new models as they accelerate through high-speed tight test maneuvers here at the company’s development facility.
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 orientated along the car’s longitudinal axis (Fig.1). In order 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 (Fig.2). Needless to say 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). Few GNSS receivers are able to perform this highly demanding capabilities and data reliability on the market today. Ashtech’s proprietary compact ATOM format ensures the data is delivered speedily 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.
Skoda is the leading car maker in the Czech Republic (former Czechoslovakia) since the end of 19th century. In 1991, Skoda began a joint venture with the German Volkswagen Group under the name Škoda, Automobilová a.s., to become the fourth brand of the Volkswagen Group alongside VW, AUDI a SEAT. Skoda’s innovation and quality achievements are used by all members of VW Group.
GEOOBCHOD is the Ashtech GPS distributor in Czech Republic. The company offers consultancy and equipment sales services to the survey and construction markets. It also provides reparation and calibration services for geodetic and construction instruments. GEOOBCHOD is one of the Czech leading dealers of global satellite positioning, navigation, total stations, theodolites, or auto levels equipment and support multiple equipment brands. www.geoobchod.cz
Recognized as an industry innovator, Ashtech has been developing GNSS technology for more than 25 years. Ashtech is the creator of BLADE technology, which introduces a unique patented method to the market using multiple GNSS constellations for high-accuracy positioning. Ashtech has also introduced the MobileMapper® series of products for GIS and mapping, as well as the ProFlex 500 and ProMark™ series, including the ProMark 500, ProMark3 RTK and ProMark 3, a well-recognized GNSS Land Survey product line currently on the market. Ashtech S.A.S. is privately held and headquartered in Carquefou, France, with offices in Beijing, China, and Singapore, as well as affiliates in Santa Clara, California (Ashtech LLC) and Moscow (Ashtech A/O LLC). For more information on Ashtech, visit www.ashtech.com.