TOW analysis method for high-sensitivity navigation receiver

A technology of navigation receiver and analysis method, which is applied in the field of TOW analysis of high-sensitivity navigation receiver, can solve the problems of high bit error rate of TOW, difficult time synchronization, etc., achieve simple and reliable demodulation, and reduce complexity Effect

Active Publication Date: 2020-01-10
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

During the signal processing process of the navigation receiver, it is necessary to correctly demodulate the time of week (TOW) to perform time synchronization. For ground or low-orbit satellite navigation receivers, the receiving signal-to-noise ratio is high, and TOW demodulation can be directly performed. However, under low signal-to-noise ratio, the bit error rate of TOW is high when directly demodulating the week, and it is difficult to be used for time synchronization

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  • TOW analysis method for high-sensitivity navigation receiver
  • TOW analysis method for high-sensitivity navigation receiver
  • TOW analysis method for high-sensitivity navigation receiver

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[0038] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0039] Such as figure 2 Shown in the method flowchart, the multiple access interference suppression method of the spread spectrum receiver based on spectrum detection of the present invention, the specific implementation steps are as follows:

[0040] 1) Divide TOW into a high bit part and a low bit part during the week, the length of each part is related to the total cumulative length, assuming that the low bit part is b (N-1) to b 0 , the high bit part is b N to b 16 , where b 0 is the lowest bit, b N is the highest bit, such as Figure 1a shown;

[0041] 2) Store K+1 frame data, denoted as F k , k=0,1,2,..., K, from the first F 0 At the beginning of the frame, find the position of all '0' in the lower bit part. For the convenience of description, the nth bit of the kth frame can be expressed as b kn :

[0042] (21) Search for ...

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Abstract

The invention provides a TOW analysis method for a high-sensitivity navigation receiver. The method, by using the characteristics of the navigation message TOW to perform staggered accumulation on thebits at the corresponding positions of multiple consecutive sub-frames TOW, improves the signal-to-noise ratio of each bit, reduces the bit error rate of demodulation, and can be applied to TOW demodulation of the high sensitivity navigation receiver. The application of the method solves the problem that the TOW cannot be demodulated normally due to the high bit error rate of the demodulation ofnavigation signals in a low signal-to-noise ratio environment. The method is simple and easy to implement, has good embeddedness, and only needs to add the accumulation module after frame synchronization of the traditional navigation receiver to achieve reliable demodulation of TOW with low signal-to-noise ratio.

Description

technical field [0001] The invention relates to the technical field of navigation receivers, in particular to a time-of-week TOW analysis method for a high-sensitivity navigation receiver. Background technique [0002] Compared with low-orbit satellites, medium-high orbit satellites mainly use navigation satellite sidelobe signals or leaked signals from the other side of the earth. Therefore, the received signal power is very weak, and the signal-to-noise ratio received by the on-board navigation receiver is as low as 0dB (corresponding to navigation The carrier-to-noise ratio of the signal is below 17dBHz. During the signal processing of the navigation receiver, it is necessary to correctly demodulate the time of week (TOW) to perform time synchronization. For ground or low-orbit satellite navigation receivers, the receiving signal-to-noise ratio is high, and TOW demodulation can be directly performed. However, under low signal-to-noise ratio, the bit error rate of TOW is ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/25
CPCG01S19/256
Inventor 杨克元张蓬田嘉王延光钱小平
Owner XIAN INSTITUE OF SPACE RADIO TECH
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