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Systems and methods for maintaining clock bias accuracy in a hybrid positioning system

a positioning system and clock bias technology, applied in the field of hybrid positioning systems, can solve problems such as strengths and weaknesses of approaches

Inactive Publication Date: 2010-03-04
SKYHOOK WIRELESS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The integrated system improves the accuracy of location and velocity estimates, reduces power consumption, and increases user availability by leveraging WLAN access points for clock synchronization and error correction, effectively addressing the limitations of standalone systems.

Problems solved by technology

Each of these approaches has its strengths and weaknesses, depending upon the nature of the signals and measurements, and the positioning algorithms employed.

Method used

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  • Systems and methods for maintaining clock bias accuracy in a hybrid positioning system
  • Systems and methods for maintaining clock bias accuracy in a hybrid positioning system
  • Systems and methods for maintaining clock bias accuracy in a hybrid positioning system

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Embodiment Construction

[0060]Embodiments of the disclosed subject matter provide a method of integrating a WLAN-based positioning system (WLAN-PS) and a satellite-based positioning system (SPS) to create a hybrid positioning system. An integrated or hybrid system refers to a system which combines the measurements from one or more systems to improve the accuracy of the positioning and velocity and bearing estimates and the accuracy of expected error estimate, and to reduce consumed power as compared to each individual system working independently. The method of integrating a WLAN-PS and SPS to create a hybrid positioning system can add raw SPS measurements as another input to WLAN-PS and WLAN-PS final estimations as another input to SPS. Raw SPS measurements from two or more satellites can assist the WLAN-PS to increase the accuracy of position estimate, HPE, and stationary user detection. WLAN-PS initial position estimate and other estimations also can help SPS to reduce time to first fix (TTFF) and power...

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Abstract

This disclosure describes systems and methods for maintaining clock bias accuracy in a hybrid positioning system. In some embodiments, the method to maintain the stability of an internal clock of an satellite positioning system receiver by using WLAN access points (APs) can include maintaining the internal clock accuracy of a satellite positioning system receiver by using one or more WLAN APs as a reference.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Application No. 61 / 059,580, filed on Jun. 6, 2008, entitled Integrated WLAN-based and Satellite-based Positioning System, which is herein incorporated by reference in its entirety.[0002]This application is related to the following references:[0003]U.S. patent application Ser. No. (TBA), filed concurrently herewith and entitled “Method and System for Determining Location Using a Hybrid Satellite and WLAN Positioning System by Selecting the Best WLAN-PS Solution;”[0004]U.S. patent application Ser. No. (TBA), filed concurrently herewith and entitled “Systems and methods for Using Environmental Information in a Hybrid Positioning System;”[0005]U.S. patent application Ser. No. (TBA), filed concurrently herewith and entitled “System and Method for Refining a WLAN-PS Estimated Location Using Satellite Measurements in a Hybrid Positioning System;”[0006]U.S. patent app...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01S19/03
CPCG01S5/0257G01S19/48G01S19/46G01S19/34H04W64/00G01S19/31G01S5/14
Inventor ALIZADEH-SHABDIZ, FARSHID
Owner SKYHOOK WIRELESS
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