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Message demodulation method and device

A demodulation method and telegram technology, applied in the field of communication, can solve problems such as inaccurate positioning and errors

Active Publication Date: 2020-05-29
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
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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

Method used

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  • Message demodulation method and device
  • Message 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 invention provides a message demodulation method and device, and the method comprises the steps: obtaining a differential phase value corresponding to the phase value of a to-be-demodulated message and a corresponding maximum likelihood ratio, and storing the differential phase value and the maximum likelihood ratio in a buffer Buffer; obtaining a first message of the first M bits in the buffer Buffer; and when the first message does not pass the preset verification, accumulating the M-bit message after a preset time interval with the first message to obtain a second message, and outputting the message words of the second message. With application of the scheme, the tracking output signal energy is increased through accumulation and the signal-to-noise ratio is increased; besides, thereliability of accumulated message judgment is improved through a probability statistics method of the maximum likelihood ratio, the sensitivity of message decoding is further improved and the problemof inaccurate positioning caused by errors due to frequent message demodulation in related technologies is solved.

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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IPC IPC(8): G01S19/24
CPCG01S19/24
Inventor 张娣赵岩蒋冶
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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