Measurement Of Microwave Signal Parameter Base On Microwave Photonic Technology

In the fields of electronic warfare and radar application, the complex electromagnetic environment has increased the difficulty for the radar receiver to process the signal, it is a very important task to measure the parameters of the radar signals in both modern defense systems and electronic intelligence systems. However, with the rapid development of information technology and the continuous upgrade of weapon equipment, the frequency band covered by the radar signal is getting bigger and bigger, due to the restriction of the electronic bottleneck,so there is a little difficulty for the traditional electronic technology to process the large bandwidth microwave signal. But at then, a new discipline which is called microwave photonics was born. The microwave photonics is a new domain which combines the microwave and phonetics. Because of the advantages of its high bandwidth, low loss and strong resistance to electromagnetic interference, the microwave photonics technology has became a more favorable replacement to the high-frequency microwave signal processing. In recent years, with the rapid development of microwave photonics, the microwave photonic has aroused thick interests from the scholars, and has became a research spots gradually.Firstly, this paper discusses the background and current research status of microwave photonics technology at home and abroad, on the basis of it, this paper is mainly focuses on the microwave photonic signal processing technology, and establishes an electronic warfare receiver model based on the microwave photons links, we've also have done some related researches on the key optical device properties and its working principle which involves in electronic warfare receiver model. Secondly, considering the bottleneck restriction of ultra wide band signal processing in the electronic domain, we have put forward the optical compression sampling frequency measurement technique which combines with the photoelectric technology. One way is to use the comb pulse property of the ultra-narrow optical pulse with a energy-equilibrium spectrum to sample the high frequency signals, then converse the original high frequency signal to lower frequency which is much lower than the Nyquist sampling frequency to a certain interval. Another way is the optoelectronic compression sampling frequency measurement system which is based on the photonic time stretch and compression sense. The system's front head has used the photonic time stretch system which utilized the Gaussian ultra-short optical pulses, after the Gaussian ultra-short optical pulses was transmitted in the dispersion compensating fiber, due to the effects of optical fiber group velocity delay effect on the narrow pulse stretch, the high speed microwave signal is slowing down in the optical domain, and the signal sampling bandwidth can be reduced effectively. While the system's back end has used the compression sense technology to start a secondary compression to the reduced signal in the electronic domain, thus decreased the sampling frequency of DAC greatly. Then we utilize the obtained under sampling datum to reconstruct the microwave signal spectrum by compression sense reconstruction algorithm, thus can make a accurate measurement of signal frequency. Then, we discuss the principles, make the simulations and analyze the results to prove the feasibility of the above two schemes. At last, on the basis of microwave photonics signal processing technology, we propose the method of measurement to the key parameters, including angle-of-arrival of the microwave signal and the time-difference-of-arrival. The method mainly makes a estimate by measuring the phase difference of the received microwave signal. At the same time, we make a principle analysis, make simulations and improvements to the proposed system. Based on the improved system, we propose a structure model which can realize the phase measurement and frequency measurement of integrated system.