Patent ID: 9694787
Date: 2017-07-04
CPC Classifications: B60R,G01S,G07C

Claim:
1. A method for determining a location of a remote transceiver in relation to a vehicle, the method comprising: transmitting, via a remote transmitter, at least two measuring signals to the remote transceiver, each of the measuring signals being transmitted from a different one of a plurality of n antennae positioned relative to the vehicle, where n denotes an integer≧2; receiving, via a receiver, an acknowledgement signal from the remote transmitter in response to each measuring signal, each acknowledgement signal including a received signal strength indication (RSSI) for each of the respective received measuring signal, values of the received RSSIs together defining a data point in an RSSI domain map; determining, via an electronic control unit, a difference between the received value of a first RSSI and a defined threshold value for the first RSSI; and controlling, via the electronic control unit, operation of at least one electrical or electromechanical component of the vehicle, wherein the controlling is based on the difference, wherein a sign of the difference indicates whether the remote transmitter is inside or outside a defined region of or near the vehicle, wherein the defined threshold value is a function of values of one or more received RSSIs defining associated data point other than the first RSSI, and wherein defined threshold values are determined by searching the RSSI domain map for a linear combination of both a minimal value of the function inside the defined region for each value of the first RSSI and a maximal value of the function outside the defined region for each value of the first RSSI.