GPS receiver and method for reducing first positioning time after starting-up

A GPS receiver, positioning time technology, applied in positioning, satellite radio beacon positioning system, beacon system using radio waves and other directions, can solve the problem that GPS receiver cannot achieve positioning normally, information is easy to lose or make mistakes, etc. Achieve the effect of reducing capture time and achieving fast positioning

Active Publication Date: 2008-08-20
BEIJING BIG TOP MOMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the RAM needs battery power, when the battery loses power or the power is insufficient, the relevant information backed up in the RAM is easy to lose or make mistakes, so that the GPS receiver cannot normally achieve positioning after it is turned on again.

Method used

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  • GPS receiver and method for reducing first positioning time after starting-up
  • GPS receiver and method for reducing first positioning time after starting-up
  • GPS receiver and method for reducing first positioning time after starting-up

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Embodiment Construction

[0014] figure 1 It is a structural block diagram of the GPS receiver system of the present invention. The GPS receiver system 100 includes a GPS positioning unit 102 and a non-volatile memory (None-Volatile Memory) 104 . The GPS positioning unit 102 and the non-volatile memory 104 can be two independent electronic devices or chips, or can be one electronic device or integrated on the same chip.

[0015] The GPS positioning unit 102 includes a GPS signal processing unit 1022 , a positioning calculation unit 1024 , an optional communication interface 1026 and an optional system battery powered real-time clock (RTC) 1028 . The GPS signal processing unit 1022 can realize functions such as acquisition, tracking and demodulation of GPS signals. The position calculation unit 1024 performs position calculation of the GPS receiver.

[0016] The non-volatile memory 104, such as FLASH memory, FRAM (Ferroelectric RAM) memory and MRAM (Magnetoresistive RAM) memory, etc., can perform in-...

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Abstract

The invention discloses a GPS receiver which reduces first positioning time after starting up and the method thereof. The GPS receiver includes positioning unit and non-volatile storage which communicates with the positioning unit. The method which reduces the first positioning time of GPS receiver includes the following steps: reading backup information stored in the non-volatile storage; obtaining current time information; estimating the Doppler shift range; according to the range of Doppler shift, capturing GPS satellite; and calculating the position of the GPS receiver. Because of using the backup information in the non-volatile storage to estimate the range of Doppler shift, even if the system is at low battery condition or powered off, the backup information in the non-volatile storage is still valid, thereby the fast positioning after user turns on the GPS receiver is realized.

Description

technical field [0001] The invention relates to a GPS receiver and a positioning method thereof, in particular to a GPS receiver and a positioning method for reducing the first positioning time after starting up. Background technique [0002] With the development of automobile and electronic computer technology and the improvement of people's living needs, the global satellite positioning system (GPS) has been widely used, and more and more people have begun to use GPS receivers and navigation systems. GPS receivers are developing rapidly in fields such as vehicle navigation and mobile consumer electronics. [0003] With the continuous expansion of application fields and the rapid increase of user groups, users have put forward more and more requirements for the functions and performance of GPS receivers, such as sensitivity (Sensitivity) and positioning accuracy (Accuracy). In addition, the time to first fix (TTFF, Time To First Fix) after power-on is also a very important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S1/02G01S1/04G01S5/02G01S19/13G01S19/42
Inventor 余晓光黄海权
Owner BEIJING BIG TOP MOMENT TECH CO LTD
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