Research On High-speed Small Target Microwave TT&C System

The microwave TT&C system is designed to measure basic state information of a target, and to control the real-time status of the target. During the whole monitoring process, the result is not be affected by the distance and the environment, so the microwave TT&C system is widely used in national defense, modern industry and the daily life of the people. With the rapid growth in the technical field and social development, TT&C system needs to be further improved. The TT&C system currently being used is mainly large scale equipment. However, such equipment is not flexible to use in some small experiments, resulting in high costs. In order to meet the development of the new technology, to develop a low-cost, small sized, high stable TT&C system research becomes more important.This thesis presents an implementation scheme of the microwave TT&C system which can measure the velocity of a target which moves at a speed of 700m/s to 1500m/s and within a distance of 300 m. The acquire speed accuracy is better than 0.1%. The system can control the target and adjust posture at a distance of 500 m to the 12000 m.To achieve the microwave TT&C system mentioned above, the thesis aims to put the function of the TT&C system as a point cut, and then to analyze and discuss the technique of the microwave TT&C, the embodiment of the system, and the design and testing of the hardware circuit. In the general discussion of the embodiment, it is focused on the performance and index requirements of the system, and the implementation of each module is also discussed. During the process of the hardware design, it mainly discusses the realization of T/R module. Firstly, the paper analyzes the index requirements of T/R module. It is assigned and simulated by simulation software. Then design the T/R module according to allocated specific indicators, including the PLL synthesizer, RF switch, limiter, LNA, PA, BPF, couplers, and IF circuit. Besides, draw the microwave circuit and the PCB. Next there is a RF front performance test to indicate the function, to compare the test results to the simulation results, and to verify the correctness of the hardware circuit design. At last, the difference between simulation and the test results is also analyzed, it is necessary to find out a way to improve the performance of the circuit.The embodiment of the TT&C system proposed by this paper meets the requirements of the low-cost, small size, high stability. Besides, the test results of T/R module implemented in this paper performed well: the signal source output power is up to 13.3dBm, phase noise attained-94.5dBc/Hz@10kHz,-99.4dBc/Hz@100kHz, RF switch’s isolation achieved 64.8dB, insert loss achieved 3.3dB, the limiter threshold level is 14 dBm, insert loss achieved 1.8dB.