Research On The Detection Technology Of Data Link Signal Based On Software Radio

Data link which is considered as the neural network of modern information warfare has realized real-time transmission of information by developing a cross transmission network in a variety of platforms.Various soldiers can be the first time sharing tactical information.It is a powerful guarantee for the rapid implementation fight and getting the initiative of the battlefield.In the whole process of wireless communication,useful signal is detected at the receiving end under the external environment interfere and the internal noise environment and it has been a hot topic at home and abroad.The effective detection of the data link signal not only can provide parameters for the latter data analysis but also can provide guidance for the design of the data link signal with the security and antiinterception characteristics.The detection method of data link signal is realized by software radio technology,which is based on the hardware platform with high flexibility and structured design.Therefore the data link signal detection technology has been studied based on the software radio and it provides the key methods for data link signal detection identification and parameter estimation.The detection unit design and key module implementation based on the FPGA+Power PC software radio platform,which provides the basis for the practical application of the key algorithm,has important practical significance.The signal sampling theory and multi-rate signal processing technology on the basis of the basic theory of software radio are analyzed and the software radio platform based on FPGA+Power PC architecture are studied.The detection technology of DS data Link signal is further studied based on the research of the generation mechanism and characteristics of DS data link signal and focus on the STFT method,the orthogonal shunt detection method of DS data link signal.The traditional delay-multiply and square frequency doubling methods are improved.The effective estimation of PN code rate is implemented by using delay-multiply auto-correlation method and the carrier frequency is effectively estimated by using ensemble average-square frequency doubling method,and the effective estimation of signal parameters in low SNR is realized by reducing the influence of noise in the signal.At the same time,the detection method based on multi-hop auto-correlation is further studied based on the analysis of key techniques of FH data link signal.The effective estimation of the carrier frequency is estimated by using the ensemble average-square frequency doubling method and the jumped speed and dwell time of the FH data link signal is estimated by using SPWVD method.Further the DS/FH data link signal detection unit is designed and realized by using ISE 13.2 and Work Bench 3.1 development environment based on the software radio platform of FPGA+Power PC architecture.The key units designed are executed by using ModelsimSE 6.5b,Matlab7.1 and Secure CRT simulation tools and the results are analyzed.Finally the correctness and validity of DS/FH data link signal detection unit are verified.