Research On Digital Diverse Receiver

New generation system of spacecaft TT &C require to integrate tracking, telemetry, telecontrol, communication, data transmission and so on. And it has many prominent characters, such as simplification, high-reliability and proper measuring accuracy.The key technique of telemetry digital diversity receiver is diversity technique, which combines independent multi-path signal or extremely irrelevant multi-path signal at less, and improves instant SNR and average SNR in receiver and enhances communication quality. There are many irrelevant multi-path signal in wireless. And diversity is a technique of extensive use and maturation, a technique of more inexpensive investment with more improvement in wireless communication. The common diversity be classified as space diversity, polarization diversity, frequency diversity, and time diversity etc. This paper focus on implement of space diversity and polarization diversity in digital field.The main subject in this paper contain:This paper studied the characters of system of spaceflight test control, and put forward the system characteristic and function interface in new system of spaceflight test control according to the evolution of SDR. And then analyzed the project demand of telemetering digital diversity receiver.This paper finished the argumentation, selection about schemes of telemetering digital diversity receiver, and established the design scheme of hardware and software through plenty of experiments on the key techniques.According to the hardware design scheme, this paper chose the key chip, and designed and verified the circuits. According to the schematic, this paper achieved the PCB, and finished signal integrate analysis and simulation.According to the software design scheme, this paper established the guideline of software development, and fractionized the function module, and then began software design and simulation.We finished the debugging about hardware and software of telemetering digital diversity receiver, and then combined adjusting and production testing and checking.