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Calibration and correction system for satellite position location systems

A frequency and time period technology, applied in the field of GPS systems, which can solve problems such as the efficiency deterioration of the frequency locking calibration method

Inactive Publication Date: 2009-07-22
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rapid changes in the received cellular carrier frequency, combined with switching the cellular phone transmitter on or off, can cause the efficiency of the frequency lock calibration method to deteriorate

Method used

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  • Calibration and correction system for satellite position location systems
  • Calibration and correction system for satellite position location systems
  • Calibration and correction system for satellite position location systems

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Embodiment Construction

[0031] The present invention will be described below in conjunction with the accompanying drawings, in which the same numerals represent the same or similar components.

[0032] Glossary of terms and abbreviations

[0033] In the detailed description, the following terms and abbreviations are used:

[0034] base station: A station that transmits a precise carrier frequency, such as a base station in a cellular telephone network;

[0035] Calibration: the process of measuring the error of current time and predicting the error of future time;

[0036] Calibration: pertaining to methods of compensating for errors predicted during the calibration process;

[0037]CDMA: code division multiple access;

[0038] FSK: frequency shift keying;

[0039] GPS: Global Positioning System, although the term GPS is often adopted to refer to the US Global Positioning System, the meaning of the term here and the approach to all devices described here apply equally well to other Global Positio...

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PUM

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Abstract

In order to provide accurate and fast position measurements in a practical mobile positioning system, the GPS receiver is calibrated, using the first frequency locked to the external transmitted signal to predict the frequency error in the next time period, and then, using the GPS oscillator to generate second frequency. In order to predict the error in the next time period, a plurality of relative time measurements are taken, an error estimate is made, and an error function is approximated in response to the set of error estimates. This prediction error is then used to calibrate the GPS receiver during the next time period. In one implementation, a multifunctional portable device is disclosed that provides cellular communications using a plurality of cellular base stations operating on predetermined desired cellular frequencies, and also uses GPS satellites that transmit GPS signals on predetermined GPS frequencies to provide cellular communications. Provide orientation.

Description

[0001] related application [0002] This application claims priority to US Provisional Patent Application No. 60 / 433,138, filed December 13,2002. field of invention [0003] The present invention relates to an apparatus and method for calculating the position of a mobile device, such as the GPS system, by using wireless signals. technical background [0004] Existing GPS-based positioning techniques use a network of satellites that transmit signals on predetermined GPS frequencies at known times. GPS receivers on the ground measure the time of arrival of signals from every satellite in the sky that can be "seen". The time of arrival of the signals is used to triangulate the position of the GPS receiver along with the exact location of the satellites and the exact time the signals were transmitted from each satellite. A standard GPS receiver includes a local oscillator for receiving GPS signals from satellites. [0005] Acquisition of signals from GPS satellites is very se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/14G01S1/02G06F16/23G06F17/30
Inventor 诺曼·F·克拉斯纳
Owner QUALCOMM INC