Patent ID: 8320280

Claim:
An apparatus for determining a coincidence of a position with a reference position, wherein radio signals from fixedly positioned radio transmitters can be received at the position, comprising: a provider for providing properties of the radio signals of the fixedly positioned radio transmitters at the position, wherein the provided properties of the radio signals comprise transmitter identifications identifying the radio transmitters; a separator for separating the radio transmitters into a first number of radio transmitters previously recorded transmitter identifications of which at the reference position are identical with transmitter identifications provided at the position, and into a second number of radio transmitters previously recorded transmitter identifications of which at the reference position and transmitter identifications provided at the position are different, wherein the separator for separating is formed to select, from the second number of radio transmitters, a number of radio transmitters received too few at the position, of which there are previously recorded properties at the reference position, but of which there are no properties provided at the position, or a number of radio transmitters received in addition at the position, of which there are no previously recorded electromagnetic properties at the reference position, but of which there are electromagnetic properties provided at the position; and a determiner for determining a measure of matching for the position on the basis of the provided properties of the radio signals, wherein both properties of the first number of radio transmitters and properties of the second number of radio transmitters are taken into account in the determination of a measure of matching, and wherein the properties of the first number of radio transmitters and the properties of the second number of radio transmitters enter the measure of matching differently, wherein the determiner for determining is formed to associate a malus value with one of the radio transmitters not received at the position or a malus value with a radio transmitter received in addition at the position.