基于微波光子技術(shù)的分布式雷達研究
[Abstract]:Distributed radar can effectively improve the survivability and combat performance of radar system, which is an important direction of radar development in the future. The distributed radar adopts the multi-static form, and many transmitters and receivers are widely distributed in the detection area. The received data are fused by the data processing center to obtain the target information. The high precision positioning requirement of distributed radar is required for the traditional electronic technology in the high reliable distributed system architecture, the high precision time synchronization of multi-station, The key issues such as the generation of large bandwidth orthogonal waveforms and the long distance transmission of multi-node wideband signals are challenged. Microwave photon technology overcomes the electronic bottleneck of traditional microwave system in processing speed and transmission bandwidth, and has the advantages of low loss and anti-electromagnetic interference, which provides a powerful support for the development of new distributed radar system. In this paper, the distributed radar system based on the microwave photonic technology is taken as the research direction, and a new method of photon assistant is put forward in the distributed radar system and its key technology. The following two aspects of research work are mainly carried out: 1. A distributed signal source location system based on wavelength division multiplexing (WDM) technology is proposed and studied. A new distributed multi-station time difference location system architecture based on wavelength division multiplexing (WDM) and optical wireless technology is introduced to achieve high precision localization of the signal source. The principle of time-of-arrival positioning technology is analyzed, and the influence of time difference measurement error and baseline length on the positioning accuracy of the system is analyzed. An experimental system composed of three nodes has been built, and the Wi Fi signal source has been successfully located in two-dimensional plane. The positioning accuracy is 16.21 cm 路2. 2. A distributed multi-input and multi-output chaotic radar system based on wavelength division multiplexing (WDM) technology is proposed and studied. A photonic assisted wideband quadrature waveform is generated and combined seamlessly with an optical-borne wireless system based on wavelength division multiplexing (WDM) technology. The high precision positioning of the object is realized. The generation and characteristics of orthogonal chaotic signals based on optoelectronic oscillator are studied and analyzed experimentally, and the effects of measurement error of arrival time and baseline length on the positioning accuracy of the system are studied and analyzed. An experimental system consisting of two transmitters and two receivers is set up, and the direct wave suppression based on adaptive filtering is realized. The two-dimensional planar positioning of metal objects is successfully carried out, and the positioning accuracy reaches 6.49 cm.
【學位授予單位】:南京航空航天大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TN958
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