Target localization using TDOA distributed antenna
First Claim
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1. A method of locating a target, comprising the steps of:
- transmitting a signal from a single transmitter to a target;
receiving a return signal from the target using at least one receiver;
calculating the round trip delay (RTD) from the transmitter to the target to said at least one receiver;
receiving a signal from the target using at least three receivers;
determining the Time of Arrival (TOA) of the signals at each receiver;
calculating a measured Time Differential of Arrival (TDOA) using the TOA from each receiver; and
using the measured TDOA and the RTD data to calculate at least a position estimate of the target.
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Abstract
This invention is a system and method of locating a target using distributed antenna. The antenna consists of several receiving elements in known locations. At least one of the receiving elements is also a transmitter and transmits an interrogation signal to a target. The return signal from the target is received by a plurality of receiving elements and the target'"'"'s position is calculated using the time of arrivals of the reply signal and the round trip delay between the transmission of the interrogation signal and the reception of the subsequent reply signal.
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Citations
49 Claims
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1. A method of locating a target, comprising the steps of:
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transmitting a signal from a single transmitter to a target; receiving a return signal from the target using at least one receiver; calculating the round trip delay (RTD) from the transmitter to the target to said at least one receiver; receiving a signal from the target using at least three receivers; determining the Time of Arrival (TOA) of the signals at each receiver; calculating a measured Time Differential of Arrival (TDOA) using the TOA from each receiver; and using the measured TDOA and the RTD data to calculate at least a position estimate of the target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A system for locating a target, comprising:
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at least one transmitter for transmitting a signal to a target; at least one receiver for receiving a return signal from the target; a mechanism for calculating the round trip delay (RTD) from said transmitter to the target to said at least one receiver; at least three receivers for receiving a signal from the target; a mechanism for determining the Time of Arrival (TOA) of the signals at each receiver; a mechanism for calculating a measured Time Differential of Arrival (TDOA) using the TOA from each receiver; a mechanism for calculating an initial azimuth of the target using the measured TDOA data; and a mechanism for calculating at least an approximate plane position of the target using the initial azimuth and the RTD data. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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37. A system for locating a target, comprising:
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a single transmitter for transmitting a signal to a target; at least one receiver for receiving a return signal from the target; a mechanism for calculating the round trip delay (RTD) from said transmitter to the target to said at least one receiver; at least three receivers for receiving a signal from the target; a mechanism for determining the Time of Arrival (TOA) of the signals at each receiver; a mechanism for calculating a measured Differential Time of Arrival (TDOA) using the TOA from each receiver; and a mechanism for using the measured TDOA and the RTD data to calculate at least a position estimate of the target. - View Dependent Claims (38, 39, 40, 43, 44, 45, 46, 47)
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41. The system 40, further comprising a mechanism for:
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a) estimating a new target position; b) calculating TOAs that correspond to the new target position; c) measuring the error between the calculated TOAs and the measured TOAs; and d) selecting the position estimate associated with the expected TOA having the minimum error as the new position estimate of the target. - View Dependent Claims (42)
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48. The system 47, further comprising a mechanism for:
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a) estimating a new target position; b) calculating TOAs that correspond to the new target position; c) measuring the error between the calculated TOAs to the measured TOAs; and d) selecting the position estimate associated with the expected TOA having the minimum error as the new position estimate of the target. - View Dependent Claims (49)
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Specification