HARTING Technologiegruppe

How Quickly May an Object Move and Still Be Identified With RFID?

Articles | By Harting Technologiegruppe | 24 February 2014
How Quickly May an Object Move and Still Be Identified With RFID? Photo: Harting Technologiegruppe

High Speed RFID

RFID Identifies Objects With up to 200 km/h

How quickly may an object move to be reliably identified with a UHF RFID system? In order to answer this question, the Harting RFID team conducted several high speed tests on an airfield together with the Ignition Racing team. The result: Even at 200 km/h, the EPC could be read nine times in a row. The results leave lots of room for UHF transponder detection at higher velocities.

Railway Safety

When it comes to data transfer components, Harting has a strong focus on railway applications – from heavy duty connectors, over Ethernet switches for rolling stock, to RFID systems for track side identification. Against this background, Harting engineers evaluated, at which speeds a UHF transponder mounted on a train can be reliably detected and the according EPC with a data amount of 96 bits written to a data base. In the tests, several combinations and configurations of Harting standard components were used. Testing different applications in advance resulted in the following speed limits for the test boundaries:

  • Boxes and parts on conveyer belts for logistics: up to 30 km/h
  • High speed transport systems in automated warehouses: 50 km/h
  • High speed robots for manufacturing: up to 50 km/h
  • Cargo trains: 120 to 160 km/h (depending on country)

Four vehicles were equipped with different transponders for the test on a taxi way at the Airport Porta Westfalica:

  • E-bike with a speed of up to 50 km/h
  • E-Racing car from Ignition Racing team with speed up to 120 km/h)
  • Gasoline racing car from Ignition Racing team with speed up to 160 km/h
  • High speed street car for speed up to 200 km/h

Which Reader Configuration Is Effective?

At three points along the taxi way, the engineers set up read points with a distance of 15 meters each and different configurations. The readers were set so the Effective Radiated Power of the antennas was 0.2 Watts at read point one and two Watts each at read points two and three, while the antenna gain was four, 8.5, and 11 dBic. Ha-VIS Middleware was used to control the reader and generate data for all three configurations.

One of three different transponders was mounted on each car. The FT89 tag (E-bike) is a flexible transponder that can be glued onto non-conducting surface (versions for conducting surfaces are available as well). Harting optimized the VT86s tag (e-Racing car) with its small size for best function on metal. The transponder SL89 (gasoline racing car and high speed street car) was mounted in combination with a metal bracket, which serves as antenna for high speed applications and in harsh environments.

E-racing Car And E-bike Are at the Same Level

At a test speed of 52 km/h, the transponder FT89 mounted on the e-bike was read one time, passing read point 1, five times passing read point two, and 39 times, passing read point three. With a test speed of 87 km/h, the e-racing car's test results with transponder VT86s mounted on metal, state one read at read point two. Four reads in a row were possible at 59 km/h with VT86s – thus, the e-racing car is about at the same level as the e-bike. In the test, the gasoline racing car passed read point two with a speed of 114 km/h. The EPC code stored at the SL89 transponder could be read eight times in a row. Finally, harting achieved nine reads with the same transponder, mounted on the high speed street car at 200 km/h. Summarizing the test results prove that a vehicle can be reliably detected and identified at 200 km/h with standard UHF RFID components.

Last modified on Monday, 24 February 2014 09:07