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🔥 Content Introduction
The Beidou B1C is the primary civilian signal of the Beidou III system, with a center frequency of 1575.42MHz, sharing frequency points with GPS L1 and Galileo E1, making it a key signal for global navigation interoperability. The intermediate frequency signal is the form of the radio frequency signal after down-conversion and is the core object processed by the receiver.
1. Basic Characteristics of B1C RF Signal
1. Basic Parameters
| Parameter | Value | Description |
|---|---|---|
| Carrier Frequency | 1575.42 MHz | Beidou III open service signal |
| Signal Bandwidth | 32.736 MHz | Total bandwidth |
| Signal Components | Data component (B1C_data) and pilot component (B1C_pilot) | Dual component design, power ratio 1:29 |
| Satellite Transmission | MEO/IGSO satellites | GEO satellites do not transmit B1C |
2. Modulation Characteristics
Data Component: Sine BOC (1,1) modulation, phase 0°, power ratio 1/4
- Code rate: 1.023 Mcps (compatible with GPS L1C)
- Navigation message: B-CNAV1, rate 50 bps
Pilot Component: QMBOC (6,1,4/33) modulation, phase 90°, power ratio 29/30
- Code rate: 10.23 Mcps (spreading code rate) Beidou Satellite Navigation System
- No navigation data, dedicated to carrier tracking, improving measurement accuracy
QMBOC modulation is the core innovation of B1C: orthogonal multiplexing MBOC, containing both BOC (1,1) and BOC (6,1) components, enhancing anti-jamming capability and tracking accuracy
⛳️ Operating Results
📣 Sample Code
%{
———————- Simulation of Beidou B1C Intermediate Frequency Signal ——————————
1) Generate Beidou B1C intermediate frequency signal
2) Plot the power spectral density of the generated signal
%}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clear all; close all; clc;
% Global Variables
global settings;
settings = iniSettings();
Xs = GenB1CSig();
PSD_Plot(Xs);
🔗 References
[1] Ren Jiangtao. Research on the Capture Algorithm of Beidou Receiver Baseband Signal [D]. Hefei University of Technology, 2010. DOI:10.7666/d.y1700248.
🎈 Some theoretical references are from online literature; please contact the author for removal if there is any infringement.
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