scholarly journals Blind Separation of Synchronous-networking Frequency Hopping Signals based on Time-frequency Analysis

2014 ◽  
Vol 34 ◽  
pp. 31-38 ◽  
Author(s):  
Ziwei Lei ◽  
Linhua Zheng ◽  
Hong Ding ◽  
Haibin Liu ◽  
Yongyong Liu
Keyword(s):  
Frequency Analysis ◽  
Frequency Hopping ◽  
Blind Separation ◽  
Time Frequency Analysis ◽  
Time Frequency

Detection and Parameter Extraction of Low Probability of Intercept Frequency Hopping Signals using the Spectrogram and the Reassigned Spectrogram

2020 ◽  
pp. 11-20
Author(s):  
Daniel L. Stevens
Keyword(s):  
Frequency Analysis ◽  
Parameter Extraction ◽  
Frequency Hopping ◽  
Time Frequency Analysis ◽  
Time Frequency ◽  
Analysis Techniques ◽  
Time Frequency Localization ◽  
Low Probability ◽  
Low Probability Of Intercept ◽  
Radar Signals

Low probability of intercept radar signals, which are often problematic to detect and characterize, have as their goal ‘to see and not be seen’. Digital intercept receivers are currently moving away from Fourier-based analysis and towards classical time-frequency analysis techniques for the purpose of analyzing these low probability of intercept radar signals. Although these classical time-frequency analysis techniques are an improvement over existing Fourier-based techniques, they still suffer from a lack of readability –which can be caused by poor time-frequency localization (such as the spectrogram), which may in turn lead to inaccurate detection and parameter extraction. In this study, the reassignment method, because of its ability to improve time-frequency localization, is proposed as an improved signal analysis technique to address the poor time-frequency localization deficiency of the spectrogram. This paper presents the novel approach of characterizing low probability of intercept frequency hopping radar signals through utilization and direct comparison of the spectrogram versus the reassigned spectrogram.

Frequency Hopping Signal Modulation Recognition Based on Time-Frequency Analysis

2021 ◽  
Author(s):  
Jing Zhang ◽  
Changbo Hou ◽  
Yun Lin ◽  
Jie Zhang ◽  
Yongjian Xu ◽  
...  
Keyword(s):  
Frequency Analysis ◽  
Frequency Hopping ◽  
Modulation Recognition ◽  
Signal Modulation ◽  
Time Frequency Analysis ◽  
Time Frequency

Research on Frequency Hopping Parameters of Hybrid Spread Spectrum Signal

2014 ◽  
Vol 543-547 ◽  
pp. 2551-2554
Author(s):  
Gang Fu ◽  
Dong Xu Zhu ◽  
Yue Feng
Keyword(s):  
High Resolution ◽  
Frequency Analysis ◽  
Spread Spectrum ◽  
Frequency Hopping ◽  
Frequency Parameter ◽  
Frequency Signal ◽  
Time Frequency Analysis ◽  
Time Frequency ◽  
Aerospace Monitoring ◽  
Frequency Diagram

In recent decades, Hybrid Spread Spectrum (DS/FH) signals has been rapidly developed and extensively used in the field of both military communications and aerospace monitoring. Through the study of hybrid spread spectrum signal, firstly use time-frequency analysis to get the time-frequency diagram of hybrid spread spectrum signal, and then wipe off the DS pseudo-code, lastly use the high-resolution frequency to estimate the parameters of hopping frequency signal, in order to provide a kind of ideas and reference to test hopping frequency parameter of hybrid spread spectrum signal.

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