| Incorporation with the digitizing design of the ILS airborne Instrument landing system receiver, and considering the theory analyses and practical applications, this paper deals with ILS navigation signal processing algorithm and its real-time hardware implementation based on reading and analyzing a number of references and technical standards. Meanwhile the characteristics of the ILS signal, the processing method and the construction of the hardware platform are also discussed. The design of AD974 four channels high precision high speed sampling circuit is given, the software and hardware design of the DSP realization method are also given. The software design, the program flow diagram, partial sources codes and simulation results are also discussed for the data sampling, digital filtering and modulation difference calculation. The data output are realized based on HI-8582 of ARINC429 and BU-61580 of MIL-STD-1553B, the interface function is realized for ARINC 429 and 1553B bus. |
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