REFERENCE BEACON METHODS AND APPARATUS FOR TDOA/FDOA GEOLOCATION
First Claim
1. A method of determining bias error in a geolocation system, comprising:
- transmitting from a transmitter a reference beacon signal containing position information relating to the transmitter;
receiving the reference beacon signal at a plurality of collection platforms;
determining a position measurement of the transmitter based on at least one of a time of arrival and a frequency of arrival of the reference beacon signal at the plurality of collection platforms; and
determining a first bias error based on the position measurement of the transmitter and the position information contained in the reference beacon signal.
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Abstract
A method and apparatus for estimating bias errors in a time-difference-of-arrival/frequency-difference-of-arrival (TDOA/FDOA) geolocation system using a reference signal transmitter in which position and/or motion information of the reference signal transmitter is encoded into the reference signal. The motion information may include the velocity and/or acceleration of the reference signal transmitter. The reference signal is received by multiple collection platforms operating in conjunction with a geolocation system and a reference correction processing system. The reference correction processing system receives, via the multiple collection platforms, the position and/or motion information, which is immediately and unambiguously associated with specific reference signal transmissions. The geolocation system estimates the position and/or velocity of the reference signal transmitter using conventional TDOA/FDOA techniques. The estimated position and/or velocity of the reference signal transmitter is compared to the information contained in the reference signal to estimate bias errors.
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Citations
28 Claims
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1. A method of determining bias error in a geolocation system, comprising:
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transmitting from a transmitter a reference beacon signal containing position information relating to the transmitter; receiving the reference beacon signal at a plurality of collection platforms; determining a position measurement of the transmitter based on at least one of a time of arrival and a frequency of arrival of the reference beacon signal at the plurality of collection platforms; and determining a first bias error based on the position measurement of the transmitter and the position information contained in the reference beacon signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 21, 22, 23, 24, 25, 26, 27, 28)
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13-20. -20. (canceled)
Specification