Study Of The Short-Burst Fast-Acquisition Device Technology

This dissertation focuses on the key technologies in the hardware design of short-burst fast-acquirer. The major work is as following:After presenting the architecture and operational principle of the satellite fast-acquirer, this dissertation studies the key steps of the signal processing which include the signal sampling, the down-conversion, the acquisition of the long pseudo-noise code. The undersampling is used based on the Band-limited signal sampling theorem. By comparing the performance of analog-quadrature down-conversion and digital-quadrature down-conversion, we choose the all-digital quadrature down-conversion under IF-sampling. Long pseudo-noise code is detected using a method in which the signal is successively IF integrated, envelop detected an video integrated.The performance parameters of ADC device are discussed in detailed with the requirements analysis of the hardware resources. The principle of choosing devices is summarized according to the results of choosing the major devices in the circuit, such as the ADC devices, FPGA devices, power transfer devices, etc.The circuit design and the PCB design of the signal processing mainboard are studies in details. The skills in designing the signal receiving circuits are concluded from the presentation of the major circuit design. The principle of PCB design is addressed according to the analysis of the ideas in maiboard's PCB design.Some of the research results have been successively used in a certain national engineering model item.