Non-cooperative Frequency Hopping GMSK Signal Detection For TTNT

Non-cooperative signal detection based on tactical target network technology(TTNT)is studied in this thesis.As the US military's new generation of data link technology,TTNT provides technical support to enhance the capability of "Network Center Warfare".It is of great theoretical and practical significance to study the non-cooperative detection of TTNT signal which is the premise of further analysis and confrontation to TTNT signal.Technical features,signal structure,channelized reception and signal existence detection about TTNT are studied in this thesis.The main work is introduced as follows:(1)The waveform forming technology of TTNT is analyzed emphatically in this thesis,including message format,channel coding and interleave technology,sending frame structure,modulation mode and the generation of frequency hopping and time hopping signals,based on the technical characteristics of TTNT.Then TTNT signal is simulated,which could provide target signal for the following signal detection studies.(2)Based on the prior information of 16 frequency hopping points of TTNT,a new tree structure channelized receiver structure is proposed.The receiver structure not only ensures that the channel has a certain degree of independence,but also easily to make flexible changes according to different environments.The simulation results show that the tree multi-level cascade structure can realize channelized reception of multiple signals,with the computational complexity increasing a little,and it can be applied to the reception of TTNT signal.(3)By establishing the energy detection model for frequency hopping and time hopping signals,this thesis deduces the statistical characteristics of the relevant detection quantities.Non-cooperative energy detection method is studied about TTNT frequency hopping pulse signal,which has time hopping characteristic.Different detection performance with Constant False Alarm Criteria and Error Probability Criteria are also discussed.At last,simulation experiments were carried out to verify the theory.(4)Based on the channelized reception and energy detection for TTNT signal,the GMSK signal recognition and the signal existence determination method for single user TTNT signal.The fractal dimension of detected instantaneous phase of the energy signal can be calculated to identify GMSK signal.On this basis,the number of detected frequency hopping GMSK pulse signals are calculated and then the existence judgment of TTNT frequency hopping signal for single user TTNT signal is achieved.Finally,the TTNT signal is detected successfully.The simulation results show that the proposed method can effectively detect the TTNT frequency hopping GMSK signal.