G - Physics – 01 – S
Patent
G - Physics
01
S
343/117, 343/85,
G01S 5/08 (2006.01) G01S 3/14 (2006.01) G01S 5/14 (2006.01) G01S 11/08 (2006.01)
Patent
CA 1050139
ABSTRACT OF THE DISCLOSURE A method of and system for locating a position in which a plurality of frequency standard devices (atomic clocks) based on the action of the natural frequencies associated with transitions between energy states in atoms and/or molecules are synchronized or phase compared at the same initial location. Two of three frequency standard devices, in a two-dimensional embodiment, are placed at transmitting stations on a known baseline. The third device is at a third station, a receiving station, which receives signals from the two transmitting sta- tions. At each transmitting station, means are provided for producing and transmitting a radio frequency carrier signal of fixed frequency and of fixed phase under the control of the frequency standard device associated with the respective station. The radio frequency carrier signals produced at the different transmitting stations differ in frequency. The radio frequency carrier signal produced at each transmitting station is modulated with a single, low frequency signal produced under the control of the same frequency standard device which controls the means which produce the radio frequency carrier. At the receiving station, means are provided for producing a reference signal, corresponding, in frequency, to the low frequency modulating signal and two local radio frequency signals corresponding, in frequency, to the radio frequency carrier signals transmitted. These signal producing means at the receiving station are con- trolled by a frequency standard device (atomic clock) associated with the receiving station. The phase of the reference signal is compared, at the receiving station, with the phase of the modulating signals recovered from the radio frequency carriers to determine respective phase differences, the differences rep- resenting coarse position data from which the total number of phase rotations (full lanes) the receiving station is from each of the transmitting stations are determined. The phase relation- ships between each of the received radio frequency carrier signals and the respective one of the two radio frequency signals produced at the receiving station are determined, the relation- ships representing fine position data which are measurements of the receiving station position within a given phase rotation (lane).
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