2018 timing system upgrades

For 2018, there have been upgrades to the CrossMgr/Impinj RFID timing system that provide improved quality results.

  • As of April 2018, CrossMgrImpinj software supports quadratic regression (QR) analysis. This allows CrossMgr software to use 3 or more RFID chip times to calculate the time on the finish line with 1/100 second precision, yielding 6-inch accuracy at 34mph.  Prior to quadratic regression, CrossMgr used only the first time reported by an Impinj reader, resulting in finish times up to 10 feet before the finish line.  Since  Impinj RFID readers supports up to 600 tags per second, tags can be read up to 20 times while passing the antenna, providing plenty of data to calculate a high precision time with very high confidence.
  • RANSAC (random sample consensus) processing logic is used to improve the results of the quadratic regression analysis. RANSAC analysis eliminates spurious outlier data collected from the RFID chip reader due to signal reflection.
  • Support has been added for higher resolution cameras.
  • CrossMgrVideo software has been improved with more features for recording and reviewing finish line photos.
  • We’ve added an ultra low light camera with an AR0130 sensor. This camera is so sensitive to light that it is used for photographing distant stars at night.
  • In addition to the Impinj H47 tags that use the Impinj Monza 4 RFID chip, we also have more sensitive Smartrac Dogbone tags using the higher performance Impinj Monza R6 chips. These chips provide improved performance when wet and also when moving above 30mph.

Comparison of RFID chip signal strength (RSSI) data points along with curves generated by quadratic regression from the same data.

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