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Method and device for achieving bit synchronization and frame synchronization of text of receiver

An implementation method and technology of bit synchronization, applied in the directions of measurement device, positioning, and communication between multiple stations, etc., can solve the problem of affecting the speed of message recovery and positioning solution, affecting the speed of bit synchronization and frame synchronization, and back-end processing. It can reduce the burden of the device and other problems, so as to shorten the first positioning time, save system resources, and improve system reliability.

Active Publication Date: 2009-12-02
华力智芯(成都)集成电路有限公司
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Problems solved by technology

[0005] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art: when multi-channel data restores the message in parallel, the burden on the back-end processor is increased, which affects the speed of positioning calculation in the message recovery, and also affects the location. The speed of synchronization and frame synchronization, which in turn causes delays in obtaining satellite launch time and time to first fix

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  • Method and device for achieving bit synchronization and frame synchronization of text of receiver
  • Method and device for achieving bit synchronization and frame synchronization of text of receiver
  • Method and device for achieving bit synchronization and frame synchronization of text of receiver

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Embodiment 1

[0027] The processing flow of the method for bit synchronization and frame synchronization of the message provided by this embodiment is as follows: figure 1 As shown, the method is aimed at the 500bit / s message, including the following processing steps:

[0028] Step 11. When performing bit synchronization, add two adjacent 1ms cumulative values ​​in the message, and connect the sign bits of the accumulated values ​​obtained after the addition in series to obtain the recovered message or to-be-determined message after bit synchronization bit-synchronized message.

[0029] According to the protocol, a frame of data of 500bit / s is 300bit, and the time length is 600ms. 1 bit has a width of 2 ms and contains two 1 ms accumulated values ​​with the same phase (ie sign bit), and the above sign bit is located at the highest bit of the data of the 1 ms accumulated value. Therefore, in the continuous 3ms accumulated value, there must be two that belong to the same bit.

[0030] When...

Embodiment 2

[0043] The processing flow of the method for bit synchronization and frame synchronization of the message provided by this embodiment is as follows: figure 2 As shown, the method is aimed at the 50bit / s message, including the following processing steps:

[0044] Step 21, when performing bit synchronization, align the NH code in a sliding window with the symbol of the 1ms accumulated value recovered by the loop to obtain the largest symbol statistical value, and obtain the restored symbol according to the sign bits of each largest symbol statistical value The message after bit synchronization.

[0045] In spread spectrum communication, the pseudo-random code of the spread spectrum is periodic. The navigation digital receiver is actually a spread spectrum system, and its code period is 1ms. When the navigation digital receiver tracks the satellite signal normally, the code ring in the loop is aligned with the satellite signal.

[0046] Correlation accumulation is performed o...

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Abstract

The embodiment of the invention provides a method and a device for achieving bit synchronization and frame synchronization of a text of a receiver. Aiming at a 500 bps text in a navigation digital receiver, the method mainly comprises the following steps: adding two adjacent 1 ms accumulated values in the text with a set time length in turn, and acquiring a text after the bit synchronization according to the accumulated value after the addition; and searching a trellis code frame header in the text after the bit synchronization according to the scheduled format information, and finishing the synchronization of the text for the bit synchronization to be determined according to the searched trellis code frame header. The method and the device can improve the speed of the bit synchronizationand the frame synchronization of navigation texts of 500 bps and 50 bps in the navigation digital receiver, save system resources, and improve the system reliability. Besides, the method and the device achieves the bit synchronization and the frame synchronization in an FPGA (Field Programmable Gate Array), and can generate the satellite launch time more quickly and shorten the first-time positioning time of the navigation digital receiver.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and device for realizing bit synchronization and frame synchronization of a receiver's message. Background technique [0002] After the navigation digital receiver completes the acquisition and tracking of the signal, it not only needs to restore the message modulated on the signal carrier, but also calculates the satellite launch time according to the bit synchronization and frame synchronization obtained in the process of recovering the message, and obtains the pseudo-range information of the satellite. The accuracy of the above-mentioned bit synchronization and frame synchronization determines the two indicators of pseudo-range accuracy and first positioning time, and the accuracy of pseudo-range affects the positioning accuracy. Therefore, bit synchronization and frame synchronization are an important part of the navigation receiver's working process. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26G01S5/14
Inventor 严锋斌钟睿
Owner 华力智芯(成都)集成电路有限公司
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