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Synchronization Method of cnav-2 Message Frame Based on Association Rules

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

Active Publication Date: 2022-05-24
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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  • Synchronization Method of cnav-2 Message Frame Based on Association Rules
  • Synchronization Method of cnav-2 Message Frame Based on Association Rules
  • Synchronization Method of cnav-2 Message Frame Based on Association Rules

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[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] first combine figure 2 Described is a method for synchronizing CNAV-2 message frames based on association rules according to an embodiment of the present invention. like Figure 2-4 As shown, the method includes the following steps:

[0037] Step S201: Acquire the CNAV-2 message frames to be synchronized, and arrange the CNAV-2 message frames to be synchroni...

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Abstract

The present invention provides a method for synchronizing CNAV-2 message frames based on association rules, said method comprising: obtaining CNAV-2 message frames to be synchronized, arranging said CNAV-2 message frames to be synchronized according to preset rules; determining the start bit p i , from the start bit p i After dividing and arranging, the CNAV‑2 message frame to be synchronized is obtained, and the set of mapping relations of the sequence formed after obtaining the division is obtained T i , the set of mapping relations T i Include one or more decimal mappings of the sequence formed after division; calculate the set of mappings T i The number of types of decimal mapping relations in N i , calculate the starting bit p i Corresponding confidence; compare each start bit p i The number of types of corresponding mapping relationships N i and confidence, determine the number of species N i The start bit corresponding to the position with the minimum and maximum confidence is the synchronization bit. According to the method of the invention, it has better anti-error performance, and the synchronization result is not affected by the threshold value, and has higher synchronization accuracy.

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 increasing demand for navigation applications in the military and civilian fields, the United States has begun to modernize and upgrade the global positioning system in recent years. In terms of civilian signals, the GPS system has added a new L1C system signal in the L1 frequency band. The L1C signal consists of two parts, the data and the pilot. Due to the large signal power of the pilot part, the received 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 the synchronization code of each frame from the received...

Claims

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Application Information

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Patent Type & Authority Patents(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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