The Design And Implementation Of A Transceiver

This paper studies the course of development of the aerospaceanswering machine, and find out today’s domestic and foreign commontechnical indicators of the answering machine of the spacecraftmonitoring, and analyze its function and performance. Detailed design onthe answering machine based on theoretical and practical design ofexisting spacecraft monitoring answering machine.Based on the answering machine of the detailed design, furtherdetailed design the transponder modulation, demodulation module. Theprogram uses digital IF scheme to achieve, RF the uplink receiver partusing double-conversion. Due to the need to achieve the PM, DPSKmodulation, the downlink modulation intends IF modulation andup-conversion program to achieve. Analog modulated is achieved by theanalog modulator, digital DPSK modulation is completed within thedigital IF module.Modulation, demodulation, there are two design methods basedcarrier synchronization, one is feedback loop synchronization technology, one is no feedback loop synchronization technology. The subject selectthe feedback loop synchronization technology, with such a"Microprocessor+coprocessor" structure, embedded MicroBlaze32bitsoft-core processor, simplify system design and improve systemperformance. Introduce how demodulation system implementations in theFPGA system. Propose distributed algorithms of filter design, build ascalable, flexible demodulation system with use of the microprocessor.