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Frame synchronization method and device

A frame synchronization and search method technology, applied in the field of global positioning system, can solve the problem of long frame synchronization time, etc., and achieve the effect of reducing system energy consumption and reducing work load

Active Publication Date: 2009-04-29
RDA MICROELECTRONICS SHANGHAICO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, it will also cause frame synchronization to take longer than figure 2 The prior art shown takes a long time to complete frame synchronization in the GPS receiving device using the TLM preamble search method

Method used

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  • Frame synchronization method and device

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Embodiment approach

[0074] The first implementation mode: simultaneously start the improved matching process and the process of using the TLM preamble search method to realize frame synchronization in the prior art, select the process that first reaches the frame synchronization, and send the information that the frame synchronization is completed to the other.

[0075] The second implementation manner: the frame synchronization is completed by using an improved matching process.

[0076] Hereinafter, an example will be given respectively with respect to the above two implementation modes to describe the present invention in detail.

Embodiment 1

[0078] Figure 4 The process flowchart of the first preferred embodiment for realizing frame synchronization of the present invention. Such as Figure 4 As shown, the improved matching process, that is, process S1 and the process that uses TLM preamble search to realize frame synchronization in GPS receiving equipment in the prior art, that is, process S2, start at the same time, select the process that first reaches frame synchronization, and send the frame synchronization completed information to another.

[0079] The process S1 and the process S2 are described separately below, in the process S1,

[0080] Step S1-401, based on the local real time clock (RTC: Real Time Clock) of the GPS receiving device, predict which frame, which subframe, and which bits the navigation data being transmitted belongs to.

[0081] In this embodiment, the navigation data is one or more bits of data in the navigation message being transmitted

[0082] In this step, based on the local RTC ti...

Embodiment 2

[0130] This embodiment is the second implementation manner, and the improved matching process is executed separately to complete the frame synchronization.

[0131] The working process of this embodiment and Figure 4 The process S1 in the first embodiment shown is similar. However, in this embodiment, because the improved matching process is executed separately to complete the frame synchronization, thus, in Figure 4 In step S1-402 of the matching process S1 shown, if the predicted navigation data cannot be obtained from the navigation message saved by the GPS receiving device, the current process ends and the process S2 is not executed any more. In step S1-403, if the predicted navigation data fails to match the navigation data directly received from the GPS satellites, continue to receive the navigation data sent by the GPS satellites until the predicted navigation data matches the navigation data received from the GPS satellites. until the data match is successful. Lik...

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Abstract

The present invention discloses a method for realizing the frame synchronization. The key of the method comprises forecasting navigation data that is being transmitted; matching the forecasted navigation data with the navigation data received from a GPS satellite directly; modifying the local time of the GPS receiving device to complete the frame synchronization under the condition that the matching is successful. The present invention also discloses a frame synchronization device realizing the frame synchronization method. According to the present invention, the time of achieving the frame synchronization for a GPS receiving device can be shortened.

Description

technical field [0001] The present invention relates to a global positioning system (GPS) technology, in particular to a frame synchronization method and device. Background technique [0002] In the global positioning system, each GPS satellite transmits a navigation message (Navigation Message) at a speed of 50 bits per s. The GPS receiving device continuously receives navigation messages from GPS satellites, and calculates the position, speed and current precise time of GPS satellites according to the received navigation messages, thereby achieving positioning and navigation functions. [0003] figure 1 It is a schematic structural diagram of a complete navigation message in the prior art. When the navigation message is transmitted, it is logically divided into different data frames, or called pages. Such as figure 1 As shown, the navigation message includes 25 data frames in total. Each data frame has 1500 bits, and its transmission time is 30 seconds (s). Each data...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04B7/185G01S5/02
Inventor 邱模波赵杰江兆根陈波
Owner RDA MICROELECTRONICS SHANGHAICO LTD
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