基于反射式调制的新型调相器研究

发布时间：2019-06-22 14:46

【摘要】：自微波统一测控系统问世以来,其主要应用于卫星、飞船的测控。应答机作为统一测控系统的关键单机,最关键的功能就在于获取以及解调地面站输出的遥控信号,对测距以及测速信号进行转发,完成测轨任务、将飞行器上的各类遥测数据发送至地面站,以完成遥测功能、产生一个稳定的连续波信号,作为地面站引导信标。相位调制器是应答机发射通道中的一个重要电路,其性能的好坏直接影响到应答机转发与遥测信道的指标。本文结合工作中型号任务需求,对调相器电路进行了广泛的调研工作,通过对电路以及电路中所用元器件的广泛调研,对调相器进行方案设计、电路仿真,采用反射式调相器进行相位调制,并且加入热敏电阻网络对调相器进行温度补偿,使之在较宽的温度范围下调制度变化较小,随后对电路板进行加工生产,并进行了一系列的试验验证工作。研制出了一种可适应较宽的温度范围(-35~+70)、便于调试测试、同时具有高可靠性的调相器电路。本文首先对卫星应答机中调相器技术发展和国内外应用现状进行了回顾,简述相位调制器的工作原理和外围电路组成。然后详细介绍了基于反射式的相位调制器设计方案,给出了ADS电路包络仿真分析的结果。最后调相器电路的研制过程和各阶段测试结果进行了详细的阐述。经过对测试结果的分析,验证了其作为卫星应答机电路的通用性和高可靠性。
[Abstract]:Since the advent of microwave unified measurement and control system, it has been mainly used in satellite and spacecraft measurement and control. As the key single machine of the unified measurement and control system, the most key function of the transponder is to obtain and Demodulate the remote control signal outputted by the ground station, forward the ranging and velocity signals, complete the task of orbit measurement, and send all kinds of telemetry data on the aircraft to the ground station in order to complete the telemetry function and produce a stable continuous wave signal, which can be used as the guiding beacon of the ground station. Phase modulator is an important circuit in transponder transmission channel, and its performance directly affects the index of transponder forwarding and telemetry channel. In this paper, according to the requirements of the model task, the phase modulator circuit is widely investigated. Through the extensive investigation of the circuit and the components used in the circuit, the scheme design, circuit simulation, phase modulation using reflective phase modulator, and adding thermistor network to compensate the temperature of the phase modulator are carried out, so that the system changes little in a wide temperature range. Then the circuit board is processed and produced, and a series of test and verification work are carried out. A phase modulator circuit which can adapt to a wide temperature range (- 35 ~ 70) is developed, which is convenient for debugging and testing, and has high reliability. In this paper, the development of phase modulator technology in satellite transponder and its application at home and abroad are reviewed, and the working principle and peripheral circuit composition of phase modulator are briefly described. Then the design scheme of phase modulator based on reflection is introduced in detail, and the results of envelope simulation analysis of ADS circuit are given. Finally, the development process of phase modulator circuit and the test results of each stage are described in detail. Through the analysis of the test results, the generality and high reliability of the circuit as a satellite transponder are verified.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V556

【相似文献】