Process and system to determine temporal changes in retransmission and propagation of signals used to measure distances, syncronize actuators and georeference applications
First Claim
1. A process to determine temporal changes in retransmission and propagation of signals, to measure distances, synchronize actuators, and georeferencing, comprising the steps of:
- installing four reference bases, each of the four reference bases comprising a receiver device, wherein three of the four reference bases are not collinear, are positioned at known geographic positions, and are visible from a repeater station;
emitting, from a transmitter device at a reference instant, a one time coded signal containing an identification of a corresponding one of the four reference bases and of the reference instant;
receiving, in the receiver device at each one of the four reference bases, the one time coded signal as received and retransmitted by the repeater station;
attributing, systematically, different arbitrary values to a change in time, phase or frequency to the repeater station to obtain one or more attributed temporal changes;
calculating, for each one of the one or more attributed temporal changes, one respective position difference for the repeater station obtained with the use of two distinct sets of the three reference bases that are not collinear;
identifying which one of the attributed temporal changes at the repeater station results in a minimum difference between two positions of the repeater station, wherein the two positions are obtained using the two distinct sets of the three reference bases that are not collinear; and
utilizing the temporal changes to determine a position of the repeater station.
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Accused Products
Abstract
The proposed solution includes the use of four reference bases on the ground at known positions, with a coded time signal transmitted by one of them which is retransmitted by the repeater station and received by each of the reference bases. Using two distinct sets of three reference bases it is possible to calculate the differences between two positions for the repeater station, assigning to the later changes in time, phase or frequency as well as temporal changes due to the signal propagation in the medium, for the respective elevation angles found for the repeater. It can be then identified which values attributed to the temporal changes produces a minimum difference between the two respective positions of the repeater station. The identified temporal change can be used for the correct determination of the repeater station and its use on pertinent applications.
14 Citations
15 Claims
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1. A process to determine temporal changes in retransmission and propagation of signals, to measure distances, synchronize actuators, and georeferencing, comprising the steps of:
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installing four reference bases, each of the four reference bases comprising a receiver device, wherein three of the four reference bases are not collinear, are positioned at known geographic positions, and are visible from a repeater station; emitting, from a transmitter device at a reference instant, a one time coded signal containing an identification of a corresponding one of the four reference bases and of the reference instant; receiving, in the receiver device at each one of the four reference bases, the one time coded signal as received and retransmitted by the repeater station; attributing, systematically, different arbitrary values to a change in time, phase or frequency to the repeater station to obtain one or more attributed temporal changes; calculating, for each one of the one or more attributed temporal changes, one respective position difference for the repeater station obtained with the use of two distinct sets of the three reference bases that are not collinear; identifying which one of the attributed temporal changes at the repeater station results in a minimum difference between two positions of the repeater station, wherein the two positions are obtained using the two distinct sets of the three reference bases that are not collinear; and utilizing the temporal changes to determine a position of the repeater station. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system to determine temporal changes in retransmission and propagation of signals, addressed for measurement of distances, synchronize actuators and georeferencing, from a remote and inaccessible repeater station containing a transponder, the system comprising:
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four reference bases, wherein three of the four reference bases are not collinear, are at known geographic positions, and are visible from the repeater station; one transmitting device configured to emit, at a reference instant, a time coded signal containing an identification of a reference transmitting base and of an instant of emission; one receiving device installed at each one of the four reference bases, the one receiving device capable to receive the time coded signal, wherein the time coded signal is emitted by the transmitting device and retransmitted by the repeater station; a plurality of precision clocks, wherein each one of the plurality of precision clocks is installed at every one of the four reference bases; one central processing station that; receives the coded time signal that is retransmitted by the repeater station, compares the coded time signal to a coded time signal generated at an emitting reference base, assigns different arbitrary values for changes in time, phase or frequency, calculates, for each of a plurality of assigned temporal changes, a respective difference between positions for the repeater station, wherein the respective difference is obtained from two distinct sets of three reference bases, identifies which value assigned to the temporal change at the repeater station results in a minimum difference between two positions found for the repeater station, and processes a corresponding temporal change to determine a position of the repeater station; and one transmission device provided at each of the three reference bases, each transmission device forwarding to the central processing station a time difference between the coded time signal received from the transponder at the repeater station and the respective coded time signal generated at each one of the three reference bases. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification