DETERMINING POSITIONS IN A WIRELESS RADIO SYSTEM
First Claim
1. Method for determining the position of an access point of a wireless radio system comprising the following steps:
- Retrieving signal measurements between the access point (HS4) of which the position is to be determined and a radio device at a plurality of locations (FP1, FP2, FP3) and signal measurements between a plurality of further access points (HS1, HS2, HS3) with a known position and the radio device at the plurality of locations;
determining the position of the plurality of locations based on the signal measurements between the further access points and the radio device; and
determining the position of the access point based on the signal measurements between the access point and the radio device and based on the position of the locations.
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Abstract
A method is described for expanding the radio-map of a WiFi system. A hotspot (HS4) of which the position is unknown and to be estimated is “seen” in a number of fingerprints (FP1, FP2, FP3), each taken at a different position. Several hotspots with a known position (HS1, HS2 and HS3) are also “seen” in the fingerprints (FP1, FP2, FP3). The geo-positions of the measurement locations, where the fingerprints (FP1, FP2, FP3) were taken, are estimated based on the signals from the hotspots (HS1, HS2, HS3) with known geo-position seen in the fingerprints and the known geo-positions of those hotspots. The position of the hotspot (HS4) is determined based on the signals from that hotspot (HS4) seen in the fingerprints and the geo-positions of the measurement locations where the fingerprints were taken, estimated in the previous step.
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Citations
25 Claims
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1. Method for determining the position of an access point of a wireless radio system comprising the following steps:
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Retrieving signal measurements between the access point (HS4) of which the position is to be determined and a radio device at a plurality of locations (FP1, FP2, FP3) and signal measurements between a plurality of further access points (HS1, HS2, HS3) with a known position and the radio device at the plurality of locations; determining the position of the plurality of locations based on the signal measurements between the further access points and the radio device; and determining the position of the access point based on the signal measurements between the access point and the radio device and based on the position of the locations. - View Dependent Claims (2, 3, 4, 5, 22, 23, 24, 25)
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6. System adapted for determining the position of an access point of a wireless radio system comprising means (600) adapted to perform the following steps:
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retrieving signal measurements between the access point (HS4) of which the position is to be determined and a radio device at a plurality of locations (FP1, FP2, FP3) and signal measurements between a plurality of further access points (HS1, HS2, HS3) with a known position and the radio device at the plurality of locations; determining the position of the plurality of locations based on the signal measurements between the further access points and the radio device; and determining the position of the access point based on the signal measurements between the access point and the radio device and based on the position of the locations.
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7. Method for determining the position of a wireless radio device based on a set of measurements of signals between the wireless radio device and further wireless radio devices located at different, known positions, the method comprising the following steps:
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a) retrieving (405) for each of the measurements the position of the corresponding further wireless radio device and a signal measurement; b) generating (410) non-repeating groups of measurements out of the set of measurements; c) for at least some of the groups; c1) assigning (420) a weight to the group and c2) determining (430) the position of the wireless radio device based on the data retrieved for the group; d) determining (470) the position of the wireless radio device by calculating a weighted average of the positions of the wireless radio device obtained from the data of at least some of the groups. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. System adapted for determining the position of a wireless radio device based on a set of measurements of signals between the wireless radio device and further wireless radio devices located at different, known positions, the system comprising means (600) adapted to perform the following steps:
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a) retrieving for each of the measurements the position of the further wireless radio device and a signal measurement; b) generating non-repeating groups of measurements out of the set of measurements; c) for at least some of the groups; c1) assigning a weight to the group and c2) determining the position of the wireless radio device based on the data retrieved for the group; d) determining the position of the wireless radio device by calculating a weighted average of the positions of the wireless radio device obtained from the data of at least some of the groups.
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20. Trilateration method for determining the position of a wireless radio device comprising the steps of:
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retrieving signal measurements between the wireless radio device (HS1) of which the position is to be determined and a further radio device at at least three locations (FP1, FP2, FP3), converting the signal measurements into distances between the wireless radio device and the three locations, determining the position of the wireless radio device by solving a system of equations formed by three circumferences wherein, a) the circumference centres correspond to the three locations; b) the circumference radii correspond to the distances, wherein the proportionality factor (N,M) of at least some of the distances with respect to another of the distances is used as an input to the system of equations.
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21. System for determining the position of a wireless radio device comprising means (600) adapted for performing the steps of:
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retrieving signal measurements between the wireless radio device (HS1) of which the position is to be determined and a further radio device at at least three locations (FP1, FP2, FP3), converting the signal measurements into distances between the wireless radio device and the three locations, determining the position of the wireless radio device by solving a system of equations formed by three circumferences wherein, c) the circumference centres correspond to the three locations; d) the circumference radii correspond to the distances, wherein the proportionality factor (N,M) of at least some of the distances with respect to another of the distances is used as an input to the system of equations.
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Specification