System and method for detecting interference in global positioning satellite signals

A system for monitoring GPS accuracy, comprising:

• a GPS receiver capable of determining its GPS coordinates;
• a memory capable of storing an initial location of said GPS receiver and a user-defined range of error;
• a processor being programmed to determine whether GPS coordinates from said GPS receiver differ from said initial location by more than a range of error, and for issuing a warning in response thereto;
• a remote unit including said GPS receiver, said memory, said processor, and a transmitter capable of sending said warning;
• and
• a monitoring unit including a receiver capable of receiving said warning and a display capable of displaying information relating to said warning.

A method for detecting errors in GPS accuracy, comprising:

• determining an initial GPS position of a marker;
• receiving GPS signals at the marker;
• calculating, from the GPS signals, a GPS coordinate position of the marker;
• comparing the GPS coordinate position and the initial GPS position;
• and
• issuing a warning if the GPS coordinate position differs from the initial GPS position by more than a predetermined amount;
• wherein the marker is in the same location for said determining and said calculating.

A system for monitoring GPS accuracy, comprising:

• a stationary GPS receiver capable of determining its GPS coordinates;
• a memory capable of storing an initial location of said GPS receiver and a user-defined range of error;
• and
• a processor being programmed to determine whether GPS coordinates from said GPS receiver differ from said initial location by more than a range of error, and for issuing a warning in response thereto.

A method for detecting errors in detected position, comprising:

• determining an initial position of a marker;
• receiving signals at the marker;
• calculating, from the signals, a detected position of the marker;
• comparing the detected position and the initial position;
• issuing a warning if the detected position differs from the initial position by more than a predetermined amount;
• identifying, in response to said issuing, a source of local interference;
• and
• neutralizing the source of local interference.

A method for detecting errors in detect position, comprising:

• determining an initial position of a marker;
• receiving signals at the marker;
• calculating, from the signals, a detected position of the marker;
• comparing the detected position and the initial position;
• and
• issuing a warning if the detected position differs from the initial GPS position by more than a predetermined amount;
• said determining further comprising:
• calculating a plurality of positions for the marker over a period of time;
• statistically analyzing the plurality of positions;
• and
• setting said initial position based on a result of said analyzing.

A system for detecting local interference in GPS signals, comprising:

• a plurality of remote units, each including:
• a circuit capable of determining its location;
• a memory capable of storing an initial location of said marker and a range of error;
• a processor being programmed to determine whether a detected location of said marker differs from said initial location by more than a range of error, and for issuing a warning in response thereto;
• a transmitter capable of transmitting said warning;
• a monitoring unit including a receiver capable of receiving said warning from each of said plurality of remote units, and a display capable of displaying information relating to said warning;
• wherein said plurality of remote units collectively provide local interference detection over an area.