Authorizing the use of a motor vehicle

A method for authorizing use of a motor vehicle, wherein the motor vehicle has a first antenna and a second antenna, wherein the first antenna and the second antenna are at a physical distance from one another, the method comprising:

• at each of a first time and a second time defining a predetermined time interval:
• emitting a first signal by the first antenna that is received by an identification transmitter antenna of a portable identification transmitter;
• ascertaining by the portable identification transmitter a spatial component of a first electromagnetic field of the received first signal;
• emitting a second signal by the second antenna that is received by the identification transmitter antenna;
• ascertaining by the portable identification transmitter a spatial component of a second electromagnetic field of the received second signal;
• ascertaining, by the portable identification transmitter, an angle between the ascertained spatial component of the first electromagnetic field of the received first signal and the ascertained spatial component of the second electromagnetic field of the received second signal;
• ascertaining, by the portable identification transmitter, a field strength of the first electromagnetic field of the received first signal and a field strength of the second electromagnetic field of the received second signal;
• and
• sending an authorization signal to authorize the use of the motor vehicle to the motor vehicle by the portable identification transmitter only if:
• the angle exceeds a predetermined threshold value;
• the angle increases over the predetermined time interval;
• the field strength of the first electromagnetic field increases over the predetermined time interval;
• and/or
• the field strength of the second electromagnetic field increases over the predetermined time interval;
• wherein the angle exceeding the predetermined threshold value, the angle increasing, the field strength of the first electromagnetic field increasing, and the field strength of the second electromagnetic field increasing ascertains that the portable identification transmitter is moving toward the motor vehicle.