Research On Signal Recognition Method Of Data Link-11

Tactical data links are widely used in the field of military communication to command and control the combat, and they are also important means in information transmission system. Using the standard message format, the date link can exchange data automatically in a secure area and in real time.TADIL ?A /Link-11 is a tactical digital information link employed by US Navy and Air Force. To disturb and demodulate Link-11 signal is an important task in the Electronic Warfare, The identification of the communication signals has been applied in many fields such as signal identification, interference identification, radio interception, electronic countermeasures, monitoring, etc,identifying the type of received signal accurately has important significance for disturbing and demodulating signals in subsequent process.Firstly, this paper introduces the development of current data links briefly, and then does some research on signal identification methods of Link-11. The paper introduces the working mode and signal characteristics of Link-11, and then presents an identification method of Link-11 signal working in high frequency band. Using the carrier frequency, code rate, modulation mode, and the unique characteristics of Link-11, the method indentifies signals by extracting the five characteristic parameters of the received signal and by using the theory of fuzzy evaluation. The suggested algorithm has the advantage of low complexity, less dimension statistical feature extracting, stable recognition effect and has some practical value. Simulation shows that the overall correct recognition rate of the algorithm reaches up to above 97% when signal to noise ratio is 10 or above.