Indoor positioning using pressure sensors
First Claim
1. A method for position estimation, the method comprising:
- receiving, by a location server, a request for reference information from a wireless network device located in an indoor environment, wherein the indoor environment also includes a first access point;
determining, by the location server, whether the location server is located in a same indoor environment as the first access point and the wireless network device based, at least in part, on a value stored at the location server;
in response to determining that the location server is located in the same indoor environment,determining, by the location server, a reference altitude and a reference pressure at the location server; and
transmitting, by the location server, the reference altitude and the reference pressure to the wireless network device for the wireless network device to determine its altitude in the indoor environment in response to determining that the location server is not located in the same indoor environment,determining, by the location server, an altitude of the first access point and a pressure at the first access point; and
transmitting, by the location server, the altitude of the first access point and the pressure at the first access point to the wireless network device for the wireless network device to determine its altitude in the indoor environment.
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Accused Products
Abstract
A pressure sensor can be implemented on a network device to minimize vertical positioning errors of the network device in an indoor environment. A reference altitude and a reference pressure associated with an access point in the indoor environment are received at the network device via a communication network. A pressure is determined at the network device in the indoor environment. An altitude of the network device associated with the pressure at the network device in the indoor environment is calculated based, at least in part, on the pressure at the network device, the reference pressure, and the reference altitude. A position of the network device in the indoor environment is determined based, at least in part, on the altitude of the navigation device and location information received from at least the access point.
80 Citations
23 Claims
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1. A method for position estimation, the method comprising:
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receiving, by a location server, a request for reference information from a wireless network device located in an indoor environment, wherein the indoor environment also includes a first access point; determining, by the location server, whether the location server is located in a same indoor environment as the first access point and the wireless network device based, at least in part, on a value stored at the location server; in response to determining that the location server is located in the same indoor environment, determining, by the location server, a reference altitude and a reference pressure at the location server; and transmitting, by the location server, the reference altitude and the reference pressure to the wireless network device for the wireless network device to determine its altitude in the indoor environment in response to determining that the location server is not located in the same indoor environment, determining, by the location server, an altitude of the first access point and a pressure at the first access point; and transmitting, by the location server, the altitude of the first access point and the pressure at the first access point to the wireless network device for the wireless network device to determine its altitude in the indoor environment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A location server comprising:
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a processor; and a memory to store instructions, which when executed by the processor, cause the location server to; receive a request for reference information from a wireless network device located in an indoor environment, wherein the indoor environment also includes a first access point; determine whether the location server is located in a same indoor environment as the first access point and the wireless network device based, at least in part, on a value stored at the location server; in response to determining that the location server is located in the same indoor environment, determine a reference altitude and a reference pressure at the location server; and transmit the reference altitude and the reference pressure to the wireless network device for the wireless network device to determine its altitude in the indoor environment in response to determining that the location server is not located in the same indoor environment, determine an altitude of the first access point and a pressure at the first access point; and transmit the altitude of the first access point and the pressure at the first access point to the wireless network device for the wireless network device to determine its altitude in the indoor environment. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A non-transitory machine-readable storage medium having instructions stored therein, which when executed by a processor causes the processor to perform operations that comprise:
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receiving, by a location server, a request for reference information from a wireless network device located in an indoor environment, wherein the indoor environment also includes a first access point; determining, by the location server, whether the location server is located in a same indoor environment as the first access point and the wireless network device based, at least in part, on a value stored at the location server; in response to determining that the location server is located in the same indoor environment, determining, by the location server, a reference altitude and a reference pressure at the location server; and transmitting, by the location server, the reference altitude and the reference pressure to the wireless network device for the wireless network device to determine its altitude in the indoor environment in response to determining that the location server is not located in the same indoor environment, determining, by the location server, an altitude of the first access point and a pressure at the first access point; and transmitting, by the location server, the altitude of the first access point and the pressure at the first access point to the wireless network device for the wireless network device to determine its altitude in the indoor environment. - View Dependent Claims (23)
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Specification