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Method and apparatus for compensating clock bias

A technology of clock deviation and clock drift, which is applied in the field of global navigation satellite system receivers, can solve the problems of inaccurate GNSS time initial value and large real-time clock deviation value, and achieve the effect of reducing the first positioning time

Inactive Publication Date: 2010-02-24
MEDIATEK INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Over time, during the power-off period of the GNSS receiver, the RTC bias value will become larger and larger as the RTC drift value accumulates, which makes the initial value of GNSS time imprecise

Method used

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  • Method and apparatus for compensating clock bias
  • Method and apparatus for compensating clock bias
  • Method and apparatus for compensating clock bias

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Embodiment Construction

[0013] Certain words are used in the description and claims to refer to specific components. Those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in functions of components as a criterion. The "including" and "including" mentioned in the entire specification and claims are open-ended terms and should be interpreted as "including but not limited to". In addition, the term "coupled" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connection through other devices.

[0014] See figure 1 , figure 1 According to the first embodiment of the present invention, it is used in the GNSS receiver to compensate the clock deviation B bias Schematic diagram of the device 100. According to an option of the first embodiment, the device 100 may represe...

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Abstract

The invention relates to a method and an apparatus for compensating clock bias, wherein the apparatus for compensating clock bias which is applied to a Global Navigation Satellite System (GNSS) receiver comprises a clock source for providing a reference time which has a clock bias to be compensated and a processing module which is coupled to the clock source for deriving at least one clock drifting value. The clock drifting value contains a first clock drifting value corresponding to a first time point. The clock bias is calculated according to the at least one clock drifting time and at leastone time section, wherein the at least one time section is a time period between the first time point and a special time point after the first time point. The method and the apparatus provided by theinvention can derive the time information and obviously decrease the first locating time.

Description

Technical field [0001] The present invention relates to a Global Navigation Satellite System (GNSS) receiver. More specifically, the present invention relates to a method and device for compensating clock deviation. Background technique [0002] One of the most important issues related to GNSS receivers is how to obtain accurate GNSS time when the GNSS receiver enters the start up mode from the power off mode. Typically, inside the GNSS receiver, all components other than the Real Time Clock (RTC) are powered down when the power is off. According to the prior art, when the GNSS receiver is powered on, the common method to obtain the initial GNSS time is to read the real-time clock time provided by the real-time clock as Coordinated Universal Time (UTC). ), and then further convert the UTC obtained from the real-time clock directly into a rough initial value of the GNSS time. [0003] Please note that a real-time clock with a real-time clock drift value is a temperature-sensitive ...

Claims

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Application Information

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IPC IPC(8): G04G5/00G01S5/02G01S1/02H03L7/00G06F17/00
CPCG04R40/06G04G3/04
Inventor 黄工栓叶育祺
Owner MEDIATEK INC
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