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Telegram demodulation method and device

A demodulation method and telegram technology, applied in the field of communication, can solve problems such as errors and inaccurate positioning, and achieve the effects of improving signal-to-noise ratio, improving sensitivity, and solving inaccurate positioning

Active Publication Date: 2022-04-26
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The telegram demodulation method and device provided by the present invention can solve the problem of inaccurate positioning due to frequent errors in telegram demodulation in the related art

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  • Telegram demodulation method and device
  • Telegram demodulation method and device

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Embodiment Construction

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] An embodiment of the present invention provides a method for demodulating telegrams, figure 1 is a flow chart of a demodulation method of a message according to an embodiment of the present invention, such as figure 1 As shown, the method includes:

[0040] S11. Obtain a differential phase value corresponding to the phase value of th...

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Abstract

The present invention provides a method and device for demodulating a message, wherein the method includes: obtaining a differential phase value corresponding to a phase value of a message to be demodulated, and a corresponding maximum likelihood ratio value, and combining the differential phase value and the obtained The maximum likelihood ratio value is stored in the cache Buffer; the first M-bit first message is obtained in the cache Buffer; when the first message fails the preset check, the M-bit message after the preset time interval After accumulating with the first message, the second message is obtained, and the text of the second message is output. Using the above scheme, on the one hand, the signal energy of the tracking output is increased by accumulation, and the signal-to-noise ratio is improved; on the other hand, the maximum likelihood The probability statistics method of random ratio improves the reliability of message judgment after accumulation, further improves the sensitivity of message decoding, and solves the problem of inaccurate positioning caused by frequent errors in message demodulation in related technologies.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for demodulating telegrams. Background technique [0002] Global Positioning System GPS receiver is a kind of DSSS (Direct Sequence Spread Spectrum) spread spectrum ranging signal received by multiple satellites (not less than 4 satellites) in the sky, and decodes the message information transmitted by the satellite by continuously tracking the satellite signal , obtain the launch time of the satellite signal, the position of the satellite in the ECEF (Earth-centered Earth-fixed coordinate system) coordinate system, and the pseudo-range between the satellite and the receiver, and obtain the coordinate value of the receiver in the ECEF through calculation. In a normal outdoor open environment, after the receiver captures and tracks the satellite, it takes about 6 seconds to decode TOW (time of week) to complete the signal frame synchronization to obtain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/24
CPCG01S19/24
Inventor 张娣赵岩蒋冶
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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