| In recent years, with the rapid development and progress of modern science and technology, as well as radar, communications and weapons guidance technology, flight gesture recognition and control technology of high-speed target has been a hot topic in the field of navigation aircraft. Modern technology pays more attention to the capacity of quickly and accurately hitting, and high-speed target under the premise of the need to ensure reliability, along with the basic elements of a faster reaction time, more accurate shooting ability. To require such a goal that high-speed target can flight in accordance with a predetermined trajectory to accomplish a specific task in the complex environment of space, it is necessary to target the high-speed flight attitude accurately identified and capable of real-time control. Otherwise, the capability of low cost, miniaturization and high reliability of the measurement and control system has been hot future research directions.A system utilizing microwave beam embodiment is presented in this thesis to recognize and control the flight attitude of aircraft target in the distance from 500 to 12000 meters. This program mainly includes a polarized wave signal transmission module and a target mounted microwave signal receiving and processing module. The main work of this thesis includes the following aspects.1. The system indicators are analyzed and demonstrated in detail based on the microwave beam embodiment principle and system requirements. Implementation plan of the overall system is determined.2. The working principle, design and implementation progress of each T/R module are presented in detail in this thesis. Simulations of the microwave signal chain are completed by using the software of ADS and HFSS to verify the feasibility of the design scheme.3. The detailed design and implementation of each module are presented, including phase-locked microwave signal source, modulator switch, amplifiers, band pass filter, local oscillator and intermediate frequency circuit.4. The circuits are tested and the system is set up to accomplish system experiment. According to the test result of module circuits debugging and system experiment, improvement method and suggestion are proposed at the end of this thesis to further improve the system.The proposed design of high-speed small target flight attitude identification and control system can well achieve the desired functionality, and meet the design requirement of small form factor, low cost and high reliability. |
