Frequency And Direction Estimation Technology Of Microwave Signals Using Microwave Photonic System Based On Compressive Sensing

Electronic reconnaissance is important in the electronic warfare,among which the frequency and the direction measurements of the signals are important tasks.Traditional frequency and direction measurements are achieved by the electronic method.However,as the signal bandwidth used by the electronic warfare is getting wider and wider,there are many limitations in the use of the Nyquist sampling theorem,which has caused an "electronic bottleneck" problem.In addition,there are some other problems,such as narrow measurement bandwidth,poor anti-interference ability,high loss and high power consumption,etc.Based on the the above problems,this paper uses microwave photonics methods to measure the frequency and the direction of the signals,which break through the "electronic bottleneck" in the traditional electrical method.The combination of the array signal processin,the compressive sensing and the microwave photonics greatly improves the frequency and direction measurement performance of the ultra-wideband signals.The main work of this paper is as follows:1.The characteristics of the microwave photonic devices and the antenna array model are studied,which are the foundation of establishing a frequency and direction measurement system.2.Single-signal frequency measurement algorithms based on the microwave optical systems are studied,including the optical power-based frequency measurement algorithm,the optical power ratio-based frequency measurement algorithm,and the compressive sensing-based frequency measurement algorithm.The simulations of the algorithms are carried out using the Opti System software and the Matlab software.3.Single-signal direction measurement algorithms based on the microwave optical systems are studied,including the optical power-based direction measurement algorithm,the optical power ratio-based direction measurement algorithm,and the compressive sensing-based direction measurement algorithm.The simulations of the algorithms are carried out using the Opti System software and the Matlab software.4.Multi-signal frequency and direction measurement algorithms based on the microwave photonics system are studied.Basing on the single-signal frequency and direction measurement algorithms,the algorithm cleverly uses the filter to achieve the multi-signal measurement.The simulations of the algorithm is carried out using the Opti System software and the Matlab software.