Location finding using a single base station in CDMA/TDMA systems
First Claim
1. A method of determining a location of a wireless mobile unit, comprising the steps of:
- determining a distance between the wireless mobile unit and a multi-sector antenna belonging to a base station receiving a signal from the wireless mobile unit;
determining an angle of arrival of the signal from stored angle measurements using at least two different antenna sector signal measurements of the signal as received at the base station, wherein angle measurements are stored in correspondence with antenna sector measurements of at least two different sectors of the multi-sector antenna; and
determining the location of the wireless mobile unit from the received signal based upon the determined distance and the angle of the received signal.
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Accused Products
Abstract
A location or position of a wireless mobile unit is determined using only measurements from a single base station. A distance between the wireless mobile unit and the base station is calculated utilizing a roundtrip delay value of an RF uplink signal received from a wireless mobile unit. Thereafter, an angle of arrival of the received signal is determined using measurements of the received signal from each of a plurality of antenna sectors of a multi-sector antenna. The angle of arrival is determined based upon stored antenna signal measurements of the multi-sector antenna, wherein a combination of different sector signal measurements corresponds to a single angle measurement. Using the determined distance and angle of arrival, a position or location of a wireless mobile unit can easily be determined using only measurements of the single base station.
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Citations
33 Claims
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1. A method of determining a location of a wireless mobile unit, comprising the steps of:
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determining a distance between the wireless mobile unit and a multi-sector antenna belonging to a base station receiving a signal from the wireless mobile unit;
determining an angle of arrival of the signal from stored angle measurements using at least two different antenna sector signal measurements of the signal as received at the base station, wherein angle measurements are stored in correspondence with antenna sector measurements of at least two different sectors of the multi-sector antenna; and
determining the location of the wireless mobile unit from the received signal based upon the determined distance and the angle of the received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for determining a location of a wireless mobile unit using signal measurements from a single base station comprising:
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a signal determining device adapted to determine a distance between the wireless mobile unit and a multi-sector antenna belonging to a base station receiving a signal from the wireless mobile unit;
a memory, adapted to store angle measurements in correspondence with antenna sector measurements of at least two different sectors of the multi-sector antenna; and
a location calculator, adapted to determine an angle of arrival of the signal from the stored angle measurements using at least two different antenna sector signal measurements of the signal and adapted to determine the location of the wireless mobile unit from the received signal based upon the determined distance and angle of arrival of the received signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification