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Receiver for assisting satellite in navigation with foundation facilities, and method therefor

A satellite navigation system and satellite navigation technology, applied in the field of low-priced field equipment, can solve the problem of high hardware cost, achieve the effect of improving sensitivity and shortening the time of first positioning

Inactive Publication Date: 2008-10-01
FURUNO ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These factors result in high hardware costs

Method used

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  • Receiver for assisting satellite in navigation with foundation facilities, and method therefor
  • Receiver for assisting satellite in navigation with foundation facilities, and method therefor
  • Receiver for assisting satellite in navigation with foundation facilities, and method therefor

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Embodiment Construction

[0049] Three hardware-based measurements can be used to synchronize local clocks in two independent systems, such as (1) time difference, (2) frequency difference, and (3) temperature-frequency model of the crystal. Any or all of these three measurements can be used to synchronize the clocks. In measurable timeDiff, if the time difference of time events of two different time sources is known, an event time of one time source can be used to calculate the event time of another time source. In a freqDiff, if the frequency difference between two clocks is known, finding the frequency of one can be used to predict the frequency of the other. A temperature-frequency correction model can be used to predict the frequency of the local GPS clock by measuring the temperature of the crystal during a measurable tempMeas (temperature measurement). If one of the time sources is a GPS receiver, the other clocks can be related to this GPS time. This makes it possible to synchronize the time ...

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PUM

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Abstract

A navigation system comprises a cell-phone, a base cellular telephone site, and a webserver. Each is paired with a GPS receiver. The GPS receiver associated with the cell-phone is aided with information received from the cell-site and webserver that help reduce satellite search uncertainty. Time difference and / or frequency difference measurements are taken with data collected from what the cell-phone and its GPS receiver assume to be accurate time and frequency. Correction information is used in post-processing of the velocity solutions computed by the cell-phone to arrive at more precise determinations for the system.

Description

technical field [0001] The present invention relates to satellite navigation receivers and systems, and more particularly to such a low-cost field device that is assisted by network-provided information about precise time and frequency, thereby shortening the time-to-first-fix first-fix), improve accuracy, and reduce manufacturing costs. Background technique [0002] US Patent Application Serial No. 09 / 687,044, filed October 11, 2000, and entitled "Satellite Navigation Receiver and Method" is hereby incorporated by reference. [0003] A Global Positioning System (GPS) receiver uses signals received from typically three or more earth-orbiting satellites to determine navigational data such as position and velocity. GPS signals, which can be received worldwide at no cost, are now used more and more often to determine a car's location to an accuracy of one block or better. Dual-frequency GPS receivers typically track a pair of radio carriers L1 and L2 associated with the GPS s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02G01S5/14H04B7/185G01C21/00G01S1/00G01S5/10G01S19/06G01S19/25G08G1/0969H04W64/00
CPCG01C21/206G01S5/10G01S19/05G01S19/29G01S19/41G01S19/256G01S19/235
Inventor P·W·麦博尼A·N·沃
Owner FURUNO ELECTRIC CO LTD
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