Patent ID: 9631914
Date: 2017-04-25
CPC Classifications: G01B,G01S

Claim:
1. An apparatus comprising: a sensor array comprising at least three sensors each configured to measure a distance to a target object in a two-dimensional (2D ) coordinate system, wherein calibrated sensor coordinates in the 2D coordinate system are determined for each of the sensors during calibration; and a controller configured to calculate a first position of the target object in the 2D coordinate system based on measurements from a first pair of the sensors and the calibrated sensor coordinates for the first pair of the sensors, to calculate a second position of the target object in the 2D coordinate system based on measurements from a second pair of the sensors and the calibrated sensor coordinates for the second pair of the sensors, and to calculate a third position of the target object in the 2D coordinate system based on measurements from a third pair of the sensors and the calibrated sensor coordinates for the third pair of the sensors, wherein the controller is configured to compare the first position, the second position, and the third position calculated for the target object, and to determine that the calibrated sensor coordinates are inaccurate if a difference between the first position, the second position, and the third position exceeds a threshold.