Research On Timing Synchronization And PCI Interface Of FY-1 Receiving System

At present, FY-1 receiving systems used by China's earth stations still have many shortcomings such as the eliminated ISA bus is chosen as computer interface bus, the demodulating part is implemented in analog way which is difficult to extend to the future FY-3 receiving system and can't adapt variable IF and variable symbol rate's data demodulation. Aiming at the shortcomings of FY-1 receiving system, an all-digital receiving system design method is given in this paper where symbol synchronization and PCI interface techniques are studied in-depth.Firstly, a detailed and in-depth analysis about timing synchronization is made in the paper, and then the simulation platform is built. Through a large number of simulations about symbol synchronization, it is found that in some systems when the ratio of sampling rate and twice the symbol rate is an integer, and Gardner algorithm is chosen as a timing error detection algorithm, a new adaptive loop filter can be designed, which can be used to improve the synchronization speed and precision of the timing recovery. Secondly, the PCI interface is well studied and the application as well as driver procedure based on PCI bus is compiled successfully. Later, the application procedure is improved according to project requirements, which has enhanced the efficiency at the same time saved the hard disk resources. Finally, the analog satellite source as well as FY-1 actual satellite source is used as signal source of demodulation card to test its performance and the results indicate that the demodulation card designed can satisfy the practical application requirements.