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Navigation message decoding method and decoding device

A technology of navigation message and decoding method, which is applied in the direction of measuring device, radio wave measurement system, satellite radio beacon positioning system, etc.

Active Publication Date: 2017-03-01
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This makes traditional navigation signal receivers unable to directly receive navigation signals that have undergone continuous convolutional encoding

Method used

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  • Navigation message decoding method and decoding device
  • Navigation message decoding method and decoding device
  • Navigation message decoding method and decoding device

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Embodiment approach

[0018] According to one embodiment, if the encoding method of the navigation message is a continuous convolutional encoding method, in step 120, the subframe of the navigation message can be determined according to the original frame header sequence, satellite number, and continuous convolutional encoder structure pseudo frame header.

[0019] Figure 4 It shows the original subframe structure of the GPS L5 signal, the subframe structure after continuous convolution coding, and the newly constructed subframe structure including the dummy frame header according to an embodiment of the present application. Such as Figure 4 As shown, the length of the original frame header sequence is 8 bits, and the number of registers of the continuous convolutional encoder (2, 1, 7) is 6. The initial state of the register that is continuously convolved with the first 6 bits in the original frame header sequence, that is, the last 6 bits of the original CRC check digit in the previous frame ...

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Abstract

The invention discloses a method and a device for decoding navigation messages. The decoding method comprises the steps of performing frame synchronization on the received navigation messages, and then decoding the frame-synchronized navigation messages to obtain the original information of the navigation messages and check information, wherein the frame synchronization step further comprises determining whether the encoding pattern of the navigation messages is continuous convolutional encoding, when the encoding pattern of the navigation messages is continuous convolutional encoding, determining the pseudo-frame header of the sub-frames of the navigation messages and performing frame synchronization according to the determined pseudo-frame header, and when the encoding pattern of the navigation messages is not continuous convolutional encoding, performing frame synchronization according to the original fixed frame header of the sub-frames of the navigation messages.

Description

technical field [0001] The application relates to a decoding method and a decoding device for navigation messages. Background technique [0002] With the development and improvement of the global satellite navigation system (GNSS), the pilot channel and data channel are introduced into the navigation signal, and the navigation receiver can use the secondary code on the pilot to determine the current bit position of the message to achieve bit synchronization, and then The frame synchronization is realized by using the frame header sequence in the navigation message carried on the data branch, and then the decoding operation is performed. [0003] Existing navigation signals usually use block code coding and general convolution code coding. The navigation signal encoded by the block code encoding method and the general convolutional code encoding method has a fixed frame header structure, and the frame synchronization can be realized by comparing the received navigation messa...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 沈剑楠崔晓伟陆明泉朱永辉
Owner TSINGHUA UNIV