Research On Radar Pulse Signal Parameter Measurement Technology

The main task of the modern electronic detection system is to detect the electromagnetic signals radiated by the enemy's military equipment, measure the signal parameters and the time and orientation of the target, on this basis, the target information of the radiation source is obtained by sorting and integrating. It can help to understand the enemy's operational intentions, military deployment and the technical performance of military electronic equipment, in order to provide information support for one's own command and decision-making and electronic warfare equipment design. Since the radar reconnaissance receiver is facing an unknown signal environment, it is the primary task of the radar reconnaissance receiver to accurately measure the intercepted radar signal parameters.In this thesis, the definition and measurement method of pulse parameters are introduced in combination with digital receiver. Then, a high probability acquisition method for simultaneous arriving signal is proposed, and the method of digital channelization is adopted. The method based on multi-phase filter digital channelization structure. The principle of digital channelization in short time Fourier transform is discussed. In this method, the pulse parameters of the radiation source signal can be measured accurately, and the random arrival time of the radiation source signal is analyzed. There is a phenomenon that the signal intercepted by the receiver does not match the actual signal in the time domain, therefore, the algorithm of radar signal pulse parameter measurement based on short-time Fourier transform digital channelization is improved, the efficiency of the algorithm is verified by the simulation.Aiming at the problem that the traditional Fourier domain channelization is not conducive to the processing of multiple broadband signals in the frequency domain, a design method based on fractional Fourier domain channelization is given. By applying the Fourier transform principle to fractional Fourier transform Analysis, the signal can be obtained in the fractional Fourier domain spectral shift can be achieved through the frequency shift in the Fourier domain. Then the mathematical model of channelization in fractional Fourier domain is given, and its efficient implementation structure is deduced according to the principle of polyphase filtering. Finally, the effectiveness of the method is verified by simulation.