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Simulation and design of deep-space frequency acquisition algorithm based on two-dimensional partition

Author: DengFuHu
Tutor: LanJiaLong
School: University of Electronic Science and Technology
Course: Circuits and Systems
Keywords: Deep space exploration Signal-to-noise ratio High - frequency dynamic Frequency Acquisition
CLC: V248.1
Type: Master's thesis
Year: 2009
Downloads: 75
Quote: 1
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Abstract


In deep space probe task, the received signal contains a great deal of the Doppler frequency and the Doppler frequency change rate. Since the detection distance, the received signal is very weak, which is a deep-space signal frequency measurement receiver of the major problems faced by the deep-space missions. How to solve the low signal-to-noise ratio of the high dynamic signal frequency measurement problem is the purpose of this study. This paper first describes the characteristics of deep space monitoring and control communication, and already deep space frequency measurement algorithm based on frequency measurement algorithm based on two-dimensional partitions, the idea of ??using frequency channel, frequency, and frequency of the received signal rate of change in the two-dimensional partition of the received signal frequency is divided into a plurality of small pieces, each one chip, the signal Doppler frequency shift and the Doppler frequency change rate are relatively small, after performing frequency channelisation each channel signal frequency offset and Doppler frequency rate of change can be short FFT accurate frequency measurement. And can reduce the practical application of the hardware resources, the amount of computation, the amount of storage, and the like. Accurate research in the actual simulation process scope of the algorithm. Part of the improvements to improve the algorithm to meet the requirements of the system as a whole. Then describes the structure of the one used in the actual design is based on the frequency of the two-dimensional partition capture unit system. In this structure, while using the 300-channel frequency measurement capture, each channel using the same structure, and finally in the quality of the state machine for unified scheduling achieve accurate FFT frequency measurement. The system is divided into multiple structure modules, and the theoretical basis for the analysis of the various modules in the exact division of the function of each module, so that the entire system is able to achieve accurate frequency measurement captures. Analyzed, then a problem in practical application, derived in the present design the most suitable structure. Finally, using this algorithm hardware emulation design a single frequency measurement channels of the various modules in the design of each module of the individual sections have been analyzed by various methods, and in each module, for improved performance . The advantages and disadvantages of a single module to provide help for the next step in the research design. Not on the hardware design due to the time and conditions of the joint trial of the actual system. But the software simulation results show that the algorithm can accurately capture deep space signal frequency measurement.

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CLC: > Aviation, aerospace > Aviation > Aircraft instrumentation,avionics, flight control and navigation > Scientific exploration equipment and instruments > Detection equipment and instruments
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