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CNAV-2 telegraph text frame synchronization method based on association rule

A CNAV-2, message frame technology, applied in the directions of synchronization devices, synchronization receivers, electrical components, etc., can solve the problems of poor anti-error performance and large influence of the detector threshold value, and achieve good anti-error performance, The effect of increasing synchronization accuracy and improving efficiency

Active Publication Date: 2021-10-22
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the present invention proposes a CNAV-2 message frame synchronization method based on association rules, which is used to solve the poor anti-error performance and the large influence of the detector threshold value in the existing CNAV-2 message frame synchronization method. And other issues

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  • CNAV-2 telegraph text frame synchronization method based on association rule
  • CNAV-2 telegraph text frame synchronization method based on association rule
  • CNAV-2 telegraph text frame synchronization method based on association rule

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[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. 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.

[0036] combine first figure 2 The CNAV-2 message frame synchronization method based on association rules is described as an embodiment of the present invention. Such as Figure 2-4 As shown, the method includes the following steps:

[0037] Step S201: Obtain CNAV-2 message frames to be synchronized, arrange the CNAV-2 message frames to be synchronized accordin...

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Abstract

The invention provides a CNAV-2 telegraph text frame synchronization method based on an association rule, and the method comprises the steps: obtaining CNAV-2 telegraph text frames to be synchronized, and arranging the CNAV-2 telegraph text frames to be synchronized according to a preset rule; determining a start bit pi, dividing the arranged CNAV-2 telegraph text frame from the start bit pi, and obtaining a mapping relation set Ti of the sequence formed after division, the mapping relation set Ti comprising one or more decimal mapping relations of the sequence formed after division; calculating the category number Ni of decimal mapping relationships in the mapping relationship set Ti, and calculating the confidence coefficient corresponding to the start bit pi; and comparing the category number Ni and the confidence coefficient of the mapping relationship corresponding to each start bit pi, and determining the start bit corresponding to the minimum category number Ni and the maximum confidence coefficient as the synchronization bit. According to the method, the error code resistance is better, the synchronization result is not influenced by the threshold value, and the synchronization accuracy is higher.

Description

technical field [0001] The invention relates to the field of electromagnetic data processing, in particular to a CNAV-2 message frame synchronization method and device based on association rules. Background technique [0002] With the continuous improvement of the demand for navigation applications in the military and civilian fields, the United States has begun to implement the modernization and upgrading of the Global Positioning System in recent years. In terms of civilian signals, the GPS system has added a new L1C system signal on the L1 frequency band. The L1C signal is composed of two parts: data and pilot frequency. Due to the high signal power of the pilot frequency part, the receiving bit error rate of the data part increases significantly. [0003] In order to solve the above problems, the CNAV-2 message of the L1C data part introduces error correction coding and uses a frame structure without a fixed sync header. The principle of frame synchronization is to find...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04L1/00
CPCH04L7/0079H04L1/004H04L1/0071
Inventor 李歆昊马涛钱其姝韩明军杜宇申金山李磊
Owner NAT UNIV OF DEFENSE TECH
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