Patent ID: 9534898
Date: 2017-01-03
CPC Classifications: G01C,G08G

Claim:
1. A method for determining whether a moving vehicle is moving in a forward movement mode or in a backward movement mode, the method comprising the steps of: measuring a compass azimuthal angle of the moving vehicle, wherein: transmitting, from the compass, the compass azimuthal angle; measuring, at a first time, a first vehicle distance and a first vehicle azimuthal angle, wherein: measuring, at a second time, a second vehicle distance and a second vehicle azimuthal angle, wherein: transmitting, from the movement measurement unit, the first vehicle distance, the first vehicle azimuthal angle, the second vehicle distance, and the second vehicle azimuthal angle; receiving, at a computation unit, the compass azimuthal angle, the first vehicle distance, the first vehicle azimuthal angle, the second vehicle distance, and the second vehicle azimuthal angle; computing, with the computation unit, a movement vector azimuthal angle of the moving vehicle, wherein: determining, with the computation unit, whether the moving vehicle is moving in the forward movement mode or in the backward movement mode based at least in part on the compass azimuthal angle and the movement vector azimuthal angle; and wherein: