Detection of deception signal used to deceive geolocation receiver of a satellite navigation system
AssigneeSouthwest Research Institute
InventorsLuke Stephen Powell, Thomas Howard Jaeckle
Life of this patent
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Abstract
A method for detecting the presence of a deception signal associated with a satellite navigation system. The deception signal has certain “observables”, which can be used by a GPS receiver to detect the presence of the deception signal.
Claims15
A method of detecting a deception signal associated with a satellite navigation system, comprising:
- receiving the deception signal with a receiver normally used for the satellite navigation system;
- calculating at least type of observable data from data provided by the deception signal and data provided by the receiver;
- wherein the observable is at least one type of observable data from the group of:
- time offsets, pseudorange residuals, Doppler residuals, and velocity of the receiver calculated from the deception signal;
- storing a consecutive series of observable values;
- and
- monitoring the stored observable values to determine if there is an abrupt change in the observable values.
A method of detecting a deception signal associated with a satellite navigation system, comprising:
- receiving the deception signal with a receiver normally used for the satellite navigation system;
- calculating time offsets between the time provided by the deception signal and the local time of the receiver;
- storing a consecutive series of time offset values;
- and
- monitoring the stored offset values to determine if there is an abrupt change in the offset values.
A method of detecting a deception signal associated with a satellite navigation system, comprising:
- receiving the deception signal with a receiver normally used for the satellite navigation system;
- calculating the pseudorange residuals;
- storing a consecutive series of pseudorange residual values;
- and
- monitoring the stored pseudorange residual values to determine if there is an abrupt change in the values.
A method of detecting a deception signal associated with a satellite navigation system, using a mobile receiver, comprising:
- receiving the deception signal with a receiver normally used for the satellite navigation system;
- determining the velocity of the receiver;
- calculating the Doppler residuals associated with the deception signal and the receiver;
- storing a consecutive series of Doppler residual values;
- and
- monitoring the Doppler residual values to determine if there is an abrupt change in the values.
A method of detecting a deception signal associated with a satellite navigation system, using a mobile receiver, comprising:
- receiving the deception signal with a receiver normally used for the satellite navigation system;
- calculating a velocity of the receiver from a previous location and a current location as determined from the deception signal;
- storing a series of velocity values;
- and
- monitoring the velocity values to determine if there is an abrupt change in the values.
A detector for detecting a deception signal associated with a satellite navigation system, comprising:
- a processor programmed to receive data in the deception signal from a receiver normally used for the satellite navigation system;
- to calculate at least type of observable data from data provided by the deception signal and data provided by the receiver;
- wherein the observable is at least one type of observable data from the group of:
- time offsets, pseudorange residuals, Doppler residuals, and velocity of the receiver calculated from the deception signal;
- memory for storing a consecutive series of observable values;
- and
- wherein the processor is further programmed to monitor the stored observable values to determine if there is an abrupt change in the observable values.
Dependencies are inferred from the claim text.