System and method for determining forged radio frequency measurements

A method for determining whether a wireless device has transmitted one or more forged radio frequency (“RF”) measurements, comprising the steps of:

• (a) receiving at a wireless device a first set of signals from a plurality of RF sources;
• (b) transmitting the first set of signals from the wireless device to a location determining system;
• (c) receiving at the location determining system a second set of signals from the plurality of RF sources;
• (d) comparing information from the second set of signals with information from the first set of signals;
• and
• (e) identifying the wireless device as having transmitted one or more forged RF measurements if the information from the second set of signals does not substantially correspond to the information from the first set of signals.

A method for determining whether an estimated location of a wireless device includes one or more forged radio frequency (“RF”) measurements, comprising the steps of:

• (a) receiving at a wireless device a first set of signals from a plurality of RF sources;
• (b) transmitting the first set of signals from the wireless device to a location determining system;
• (c) determining an estimated location of the wireless device at the location determining system as a function of the transmitted first set of signals;
• (d) receiving a second set of signals at the location determining system from the plurality of RF sources as a function of the estimated location;
• (e) comparing information from the second set of signals with information provided by a database;
• and
• (f) identifying the estimated location as including one or more forged RF measurements if the information from the second set of signals does not substantially correspond to the information provided by the database.

A system for determining whether a wireless device has transmitted one or more forged measurements from signals received from a plurality of radio frequency (“RF”) sources comprising:

• (a) a wireless device having:
• (i) a receiver for receiving a first set of signals from a plurality of RF sources, and
• (ii) a transmitter for transmitting the received first set of signals;
• and
• (b) a location determining system having:
• (i) a receiver for receiving the first set of signals transmitted from the wireless device and for receiving a second set of signals transmitted from the plurality of RF sources,
• (ii) circuitry for comparing information from the second set of signals with information from the first set of signals, and
• (iii) circuitry for identifying the wireless device as having transmitted one or more forged RF measurements if the information from the second set of signals does not substantially correspond to the information from the first set of signals.

A method for determining whether a wireless device has transmitted one or more forged radio frequency (“RF”) measurements, comprising the steps of:

• (a) receiving at a location determining system a first set and a second set of signals from a plurality of RF sources during substantially the same time period, the first set of signals being transmitted from a wireless device;
• (b) comparing information from the second set of signals with information from the first set of signals;
• and
• (c) identifying the wireless device as having transmitted one or more forged RF measurements if the information from the second set of signals does not substantially correspond to the information from the first set of signals.

A method for determining the veracity of a location of a wireless device, comprising the steps of:

• (a) determining an estimated location of the wireless device at a location determining system as a function of signals transmitted from the wireless device;
• (b) comparing the estimated location with information from a second set of signals received during substantially the same period as the signals received from the wireless device;
• and
• (c) identifying the estimated location as including one or more forged radio frequency measurements if the information from the second set of signals does not substantially correspond to estimated location.