Navigation enhancement signal modulation method and system

A technology of signal enhancement and modulation method, applied in the field of satellite navigation, which can solve the problems of increasing the bandwidth occupied by the signal, consuming power, increasing the information rate, etc.

Active Publication Date: 2019-09-17
XIAN INSTITUE OF SPACE RADIO TECH
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AI Technical Summary

Problems solved by technology

The first method is to keep the code rate constant and increase the information rate, which leads to a decrease in the number of chips in a symbol, reduces the spreading gain, and deteriorates the cross-correlation performance
The second is to keep the spreading gain constant and increase the information rate, which leads to an increase in the code rate and a larger bandwidth occupied by the signal
However, through the method of phase separation, the I branch will consume a part of the power, and when performing signal tracking or demodulation, it cannot use all the signal power, reducing the accuracy and demodulation threshold

Method used

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  • Navigation enhancement signal modulation method and system
  • Navigation enhancement signal modulation method and system
  • Navigation enhancement signal modulation method and system

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Embodiment

[0106] Embodiment: The operation steps of the navigation enhancement signal modulation method disclosed in the present invention are as follows:

[0107] (1) Channel coding.

[0108] The low-speed telegram and high-speed telegram are separately channel coded, and the original information rate of the low-speed telegram is R b,L = 125bps, the symbol rate is R after channel coding s,L =250sps, the coding efficiency is 1 / 2, and the information symbol stream after channel coding is {d L,m }, d L,m ∈{0,1}. The original information rate of the high-speed message is R b,H =2.25kbps, the symbol rate is R after channel coding s,H =4.5ksps, the coding efficiency is 1 / 2, and the information symbol stream after channel coding is {d H,m }, d H,m ∈{0,1}.

[0109] (2) PRN code mapping.

[0110] The PRN code sequence sequence of the low-speed message is {c L,i }, i=0,1,2,...,5114, c L,i ∈{0,1}, the code length is L c = 5115, the code rate is R c = 5.115Mcps. A low-speed data symbol has 4 cod...

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Abstract

The invention relates to a navigation enhancement signal modulation method and system, and the method comprises the following steps of (1) channel coding: respectively carrying out channel coding on a low-speed message and a high-speed message; (2) PRN code mapping: mapping the low-speed message after channel coding into a path of PRN code sequence, and mapping the high-speed message after channel coding into a path of PRN code sequence to obtain two paths of PRN code sequences; (3) code period time division: according to a code period time division pattern, time division multiplexing the two PRN code sequences into one signal according to a code period; and (4) baseband waveform modulation: performing baseband waveform modulation on one path of signal obtained after code period time division multiplexing to obtain a baseband signal. Compared to the mixed structure of BPSK and R-CSK using QPSK modulation, the navigation enhancement signal modulation method and system adopts a code period time division technology, and the spread spectrum code period of the modulated low-speed message and the spread spectrum code period of the modulated high-speed message are broadcasted after time division according to the time division pattern of a fixed structure. All power can be used for signal tracking and demodulation.

Description

Technical field [0001] The invention belongs to the field of satellite navigation, and mainly relates to a navigation enhancement signal modulation method and system with high precision and high information rate. Background technique [0002] With the development of the Global Navigation Satellite System (GNSS), basic navigation services have gradually matured, and navigation enhancement services have gradually become a hot spot in the field of satellite navigation. Navigation enhancement is divided into ground-based enhancement and satellite-based enhancement in terms of realization means. Navigation enhancement can be divided into integrity enhancement, usability enhancement, accuracy enhancement, etc. from the enhancement effect. In principle, navigation enhancement can be divided into information enhancement and signal enhancement. Information enhancement improves positioning accuracy by broadcasting precise messages or precise correction numbers. The signal itself does not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24G01S19/30G01S19/29
CPCG01S19/243G01S19/29G01S19/30
Inventor 蒙艳松严涛周昀王瑛雷文英王国永边朗
Owner XIAN INSTITUE OF SPACE RADIO TECH
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