Unlock instant, AI-driven research and patent intelligence for your innovation.

A Beidou navigation message encoding method based on the characteristics of punctured polar codes

A technology of navigation text and Beidou navigation, which is applied in the field of satellite navigation and satellite communication, can solve the problem of high frame loss rate of navigation signals, achieve the effects of ensuring frame loss rate, improving poor anti-interference ability, and improving accuracy

Active Publication Date: 2020-09-08
HANGZHOU DIANZI UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing Beidou navigation and positioning system, the D1 navigation message subframe does not perform error correction coding on the first 15 bits of information, which includes an 11-bit frame synchronization code. It is conceivable that the frame loss rate of the existing navigation signals is very high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Beidou navigation message encoding method based on the characteristics of punctured polar codes
  • A Beidou navigation message encoding method based on the characteristics of punctured polar codes
  • A Beidou navigation message encoding method based on the characteristics of punctured polar codes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] figure 1 The overall flow chart of the Beidou navigation message encoding method based on the punctured polar code provided by the present invention is given, and its specific implementation is as follows:

[0020] (1) figure 2 A schematic diagram of the frame structure of the D1 navigation message is given, which is represented by figure 2 It can be seen that the subframe length of the D1 navigation message is specified as 300, in which the length of the navigation message information is 224 bits, and the length of the redundancy check bit is 76 bits. Therefore, through the random generation function, a 224-bit random binary number is obtained as the information bit of the Beidou D1 navigation message.

[0021] (2) The subframe length of the D1 navigation message is specified as 300, and it is necessary to construct a polar code with a length of 300 bits and a code rate of 224 / 300 to encode the navigation message information. The polar code proposed by Arikan is c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a Beidou navigation message encoding method based on residual polarization code characteristics. The method comprises the following steps: firstly obtaining Beidou D1 navigation message information bits; mapping the D1 navigation message information bits into residual polarization codes; encoding the D1 navigation message information bits by using the residual polarization codes; performing BPSK modulation on the encoded bit stream, and transmitting the encoded bit stream in an AWGN channel, performing BPSK demodulation on a navigation message on a receiving end, and performing SC decoding; and obtaining D1 navigation message information in a demapping manner, and calculating a corresponding bit error rate. According to the method, the unequal error protection idea is adopted to ensure the accuracy of frame synchronous code of the D1 navigation and guarantee a certain frame loss rate, meanwhile compared with BCH (15, 11, 1) encoding, by adoption of the method disclosed by the invention, the 1.6dB gain can be obtained, the accuracy of receiving the D1 navigation message is effectively improved, and the problems of poor anti-interference ability and high bit error rate of Beidou navigation signals are improved.

Description

technical field [0001] The invention relates to the fields of satellite communication and satellite navigation, and relates to a Beidou navigation message encoding method based on the characteristics of punctured polar codes. Background technique [0002] China's BeiDou Navigation Satellite System (BDS) is a global satellite navigation system developed by China itself. It is the third mature satellite navigation system after the global positioning system (GPS) of the United States and the global navigation satellite system (GLONASS) of Russia. China's BDS, the United States' GPS, Russia's GLONASS and the European Union's Galileo navigation satellite system (Galileo) are suppliers identified by the United Nations Satellite Navigation Commission. China plans that the Beidou system will cover the Asia-Pacific region around 2012 and the whole world around 2020. [0003] When Beidou satellites communicate, the communication distance is very long, and the receiving sensitivity a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H03M13/13
CPCH03M13/13H04L1/0009H04L1/0047H04L1/0057
Inventor 沈周青尚俊娜岳克强黄金鹏刘参
Owner HANGZHOU DIANZI UNIV