Position determining system
First Claim
1. A position determining system, for receiving broadband signals transmitted by a number of transmission sources equal at least to the number of dimensions in which the movement of a roving object is to be monitored, the system comprisinga pair of recevng stations, in use the first of the receiving stations being at a known position and the second being located on the roving object;
- a position determining processor;
means for passing a link signal from each of the receiving stations to the position determining processor, the link signal containing information about the signals received at the receiving station from the transmission sources;
wherein each of the receiving stations is arranged to receive the signals from the respective transmission sources substantially simultaneously by monitoring for receipt of a specific portion of the transmitted signals, and the position determining processor is arranged to compare the information received from the one receiving station about the signals received at the one receiving ston from the transmission sources with the information received at the other receiving station about the skis received at the other receiving station from the transmission sources, and to determine the time delay between the respective signals received at both receiving stations in order to determine the position of the roving object.
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Accused Products
Abstract
The invention relates to a position determining system, for receiving digital telephone signals transmitted by a number of transmission sources BTS. The system has a pair of receiving stations, CBU and CRU, one at a known position O and another on a roving object R; a position determining processor CPP; and means for passing a link signal, L1 and L2, from each of the receiving stations to the position determining processor, the link signal containing information about the signals received at the receiving station from the transmission sources. Each of the receiving stations is arranged to receive the signals from the respective transmission sources substantially simultaneously. The position determining processor is arranged to compare the information received from the one receiving station with the information received at the other receiving station, and to determining the time delay between the respective signals received at both receiving stations in order to determine the position of the roving object.
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Citations
18 Claims
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1. A position determining system, for receiving broadband signals transmitted by a number of transmission sources equal at least to the number of dimensions in which the movement of a roving object is to be monitored, the system comprising
a pair of recevng stations, in use the first of the receiving stations being at a known position and the second being located on the roving object; -
a position determining processor; means for passing a link signal from each of the receiving stations to the position determining processor, the link signal containing information about the signals received at the receiving station from the transmission sources; wherein each of the receiving stations is arranged to receive the signals from the respective transmission sources substantially simultaneously by monitoring for receipt of a specific portion of the transmitted signals, and the position determining processor is arranged to compare the information received from the one receiving station about the signals received at the one receiving ston from the transmission sources with the information received at the other receiving station about the skis received at the other receiving station from the transmission sources, and to determine the time delay between the respective signals received at both receiving stations in order to determine the position of the roving object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of determining the position of a roving object, the method comprising transmitting broadband signals from a number of transmission sources equal at least to the number of dimensions in which the movement of a roving object is to be monitored;
- receiving the signals at a pair of receiving stations, in use the first of the receiving stations being at a known position and the second being located on the roving object, each of the receiving stations being arranged to receive the signals from the respective transmission sources substantially simultaneously by monitor for receipt of a specific portion of the transmitted signals;
passing link signals from each of the receiving stations to the position determining processor, the link signals containing information about the signals received at the respective receiving station from the transmission sources;
comparing the information received at the position determining processor from the one receiving station about the signals received at the one receiving station from the transmission sources with the information received from the other receiving station about the signals received at the other receiving station from the transmission sources; and
determining the time delay between the reserve signals received at the receiving stations in order to determine the position of the roving object. - View Dependent Claims (17)
- receiving the signals at a pair of receiving stations, in use the first of the receiving stations being at a known position and the second being located on the roving object, each of the receiving stations being arranged to receive the signals from the respective transmission sources substantially simultaneously by monitor for receipt of a specific portion of the transmitted signals;
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18. A method of estimating the offset in time of receipt of a broadcast signal received at two locations, where the signal received at one of said two locations is subject to corruption by multipath effects, the method comprising autorelating the signals received at the one of said two locations;
- auto-correlating the signals received at the other of said two locations;
cross-correlating the signals received at the one and other of said two locations;
constructing a template comprising that portion of the auto-correlation of the signals received at the other of said two locations corresponding to offset times before that of the central peak, and that portion of the auto-correlation of the signals received at the one of said two locations corresponding to offset times after that of the central peak; and
measuring the offset at which the template best fits the measured cross-correlation of the signals received at the one and other of said two locations as an estimate of the time offset between the signals received at the two locations.
- auto-correlating the signals received at the other of said two locations;
Specification