A multi-signal modulation mode recognition technology based on a hybrid algorithm

Analysis of the Multiplexing Method of New System Navigation Signals of GPS III First Star L1 Frequency in China’s Regional

Sensors ◽

10.3390/s19245360 ◽

2019 ◽

Vol 19 (24) ◽

pp. 5360

Author(s):

Hongjun Ye ◽

Xiaojun Jing ◽

Liang Liu ◽

Shuo Hao ◽

Baoguo Yu

Keyword(s):

Signal Transmission ◽

Phase Relationship ◽

Monitoring And Evaluation ◽

Signal Acquisition ◽

Power Ratio ◽

Signal Modulation ◽

Modulation Mode ◽

Gps Satellites ◽

Nonlinear Amplifiers ◽

New System

Compared with the previous GPS satellites, the first GPS III satellite adds a new civil signal L1C to the signal components of the L1 frequency in addition to the improvement of positioning accuracy, anti-interference ability, and service life. The selection and combination of signal modulation and multiplexing methods will affect the power ratio and phase relationship in the process of signal transmission. In the distribution of constellation of different modulation modes, the signal amplitudes of different signal constellation points will be affected by the nonlinear amplifiers of satellites. The analysis can assess its impact on navigation performance. The iGMAS monitoring and evaluation center of the 54th Research Institute of China Electronics Technology Group Corporation uses the low-distortion data acquisition and processing platform and refined signal software receiving processing algorithm of the iGMAS monitoring and evaluation center to complete the signal acquisition of the first satellite of GPS III over China, and processes accordingly for its signal modulation mode. Compared with the previous generation GPS of old system signals, it is found that the GPS signal of the new system not only adds the L1C frequency, but also the constant envelope multiplexing mode of the L1 frequency signal, and the power ratio of the internal signal components are also adjusted.

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An Improved QPSK Signal's Algorithm Design and Simulation of its Modulation and Demodulation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.912-914.1146 ◽

2014 ◽

Vol 912-914 ◽

pp. 1146-1149

Author(s):

Fan Zhou ◽

Xin Xin Geng ◽

Xiao Yu Zhang

Keyword(s):

High Frequency ◽

Satellite Communication ◽

Algorithm Design ◽

High Frequency Band ◽

Signal Modulation ◽

Software Simulation ◽

Modulation And Demodulation ◽

Modulation Mode ◽

Depth Analysis ◽

Simulation Testing

QPSK, a modulation mode with a high frequency band utilization ratio and a strong anti-noise immunity,is widely used in the field of military and satellite communication. This article based on the analysis of the traditional QPSK signal modulation and demodulation mechanism, proposes an improved QPSK signal modulation and demodulation algorithm, and have a further in-depth analysis of the feasibility of this algorithm. Finally, by MATLAB software simulation testing, simulation results shows that the algorithm can accurately generate a QPSK signal and complete a rapidly demodulation of a QPSK signal.

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