System and method for multilaterating a position of a target using mobile remote receiving units
First Claim
1. A method of multilaterating the position of a target, comprising the steps of:
- deploying a plurality of time synchronized or non-synchronized transceiver units in a network, each of the plurality of time synchronized or non-synchronized transceiver units in the network communicating with other transceiver units and communicating with a central processor;
using one of a probe operation or a U-probe operation to determine propagation delay measurements between at least a first transceiver unit and each transceiver unit of the plurality of time synchronized or non-synchronized transceiver units within a coverage area of the first transceiver unit;
determining calibration values for a local clock of the first transceiver unit relative to each transceiver unit of the plurality of time synchronized or non-synchronized transceiver units within a coverage area of the first transceiver unit;
determining a position of each transceiver unit relative to the first transceiver unit;
receiving a target signal from the target at three or more transceiver units of the plurality or time synchronized or non-synchronized transceiver units;
determining a time of arrival for the target signal at each transceiver unit receiving the target signal based on at least the calibration value for the tranceivers local clock and the clocks of other transceiver units that also receive the target signal;
determining a time difference of arrival of the target signal using the time of arrival measured between each pair of transceiver units receiving the target signal; and
using the corrected time difference of arrival and the position of the transceiver units receiving the target signal to determine the position of the target by multilateration.
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Accused Products
Abstract
A method of multilaterating the position of a target, including the steps of deploying a plurality of time synchronized receiving units in a network that allows the receiving units to communicate with a central processor; receiving a target signal from the target at each receiving unit; determining a time of arrival for the target signal at each receiving unit; determining position data for each receiving unit at the time when the target signal is received at each respective receiving unit; and using the time of arrival and position data for each receiving unit to determine the position of the target by multilateration. A system for carrying out the method is also disclosed.
25 Citations
42 Claims
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1. A method of multilaterating the position of a target, comprising the steps of:
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deploying a plurality of time synchronized or non-synchronized transceiver units in a network, each of the plurality of time synchronized or non-synchronized transceiver units in the network communicating with other transceiver units and communicating with a central processor; using one of a probe operation or a U-probe operation to determine propagation delay measurements between at least a first transceiver unit and each transceiver unit of the plurality of time synchronized or non-synchronized transceiver units within a coverage area of the first transceiver unit; determining calibration values for a local clock of the first transceiver unit relative to each transceiver unit of the plurality of time synchronized or non-synchronized transceiver units within a coverage area of the first transceiver unit; determining a position of each transceiver unit relative to the first transceiver unit; receiving a target signal from the target at three or more transceiver units of the plurality or time synchronized or non-synchronized transceiver units; determining a time of arrival for the target signal at each transceiver unit receiving the target signal based on at least the calibration value for the tranceivers local clock and the clocks of other transceiver units that also receive the target signal; determining a time difference of arrival of the target signal using the time of arrival measured between each pair of transceiver units receiving the target signal; and using the corrected time difference of arrival and the position of the transceiver units receiving the target signal to determine the position of the target by multilateration. - 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, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification