Real-Time Estimation Of Pulse Parameters And FPGA Implementation

Electronic reconnaissance is the main means of military intelligence reconnaissance in modern warfare, fast and high-accuracy estimation of pulse parameters is the foundation and prerequisite of electronic reconnaissance, and it is also an important basis of signal sorting and identification in badly signal environment. Developing research on real-time pulse parameters estimation techniques has very important meaning. The purpose of parameters estimation is to obtain information, judge its properties and send information to the Back-end for processing. Combining the requirement of above, This topic launch discuss on parameters estimation of pulse signal, and aims to achieve parameters estimation system of pulse signal on FPGA platform, this paper is mainly divided into three parts.Firstly, refer to software radio method, this paper analyzed DDC technique, discussed the application of bandpass sample in DDC application. On the basis of above, this paper presented a simplified design and gived its hardware implementation. It is verified that this method is feasible and effective.Secondly, specific estimation method for arrival time and pulse width is given. In the condition of different pulse width, noise has different impacts on pulse signals of slow rising and falling edge. This paper presented an adaptive multi-smoothing method for parameters estimation and gived its FPGA design. It is shown that this design can effectively extract arrival time and pulse width.Finally, based on the analysis of Time-frequency characteristics, this paper used the means of instantaneous phase to estimate FM slope and initial frequency of LFM signal, and this method can also be used to estimate center frequency of simple pulse and BPSK. Furthermore, this paper adopted eliminating bad values to decrease the impact of noise and least-squares method to fitting instantaneous frequency curve. Meanwhile, this paper gived FPGA design of this algorithm.