Angle Tracking Technology Research Based On The PCM/FM Telemetry Signals Under The Condition Of Large Dynamic And Low SNR

In recent years, with the development of human space technology, the Near spaceresearch has caused the attention of all countries. And the near space TT&Ccommunication is one of the important link to connect the human and near space. AlsoTT&C communication is an important technology of the key technologies. Near spaceTT&C communication because of its environmental characteristics, making the captureand tracking a large difficult, especially in large dynamic and low signal-to-noise ratio(SNR) of the case. So in large dynamic and low signal-to-noise ratio of signal to realizethe rapid capture and high precision tracking research has important significance.This paper studies the large dynamic, the condition of a low SNR, PCM/FMtelemetry signals based on the Angle tracking technology. First of all, we studied thePCM/FM Angle tracking system based on four phase modulation, to theoretical researchand derivation. And through the simulation, We analyzed the effects of the DopplerFrequency offset in the system. On the basis, in order to solve the problem of theDoppler Frequency offset, this paper proposed a method of PCM/FM Angle trackingbased on second order FLL large dynamic, and presents two solutions. Simulationanalyses its performance.Finally, in view of the second order FLL shortcomings, in order to further improvethe Angle tracking performance, we proposed the method of PCM/FM signal Angletracking based on digital channelized large dynamic. We present two kinds of solutionsand through the simulation analysis of its performance. then we prove that the methodof digital channelized in performance is better than the second order FLL method.