| Satellite communication is one of the most important modern communication forms. It has the advantages of far communication distance, wide frequency band, large information capacity, high stability and so on. It is widely applied in military, navigation, mobile communication. The C band, uplink on 6GHz and downlink on 4GHz, is the most widely used and stability communication network at present.The transceiver front-end of Satellite ground station out door unit (ODU) is the most important component part of satellite communication system. Its performance will directly affect the communication quality of satellite link. In this thesis, the advantages and disadvantages of the different modern transceivers are compared in detail. Then, the C band front-end circuits of satellite transceiver are designed according to the project specifications. The structure of the satellite transceiver is double conversion scheme based on the same local oscillators. The transceiver has the characters of simple structure, excellent performance, cheap cost and well stability.The test results indicate that the output power (1dB compress point) of the transmitter is 43dBm (20W) in the frequency rang from 5.8GHz to 6.6GHz. the gain rang is from 58.7 to 90dB. The three-order intermodulation (1dB compress point back off 6dB) and harmonic suppression is 43dB and 53dB respectively. The receiver works from 3.4GHz to 4.2GHz with gain rang from 23.6~55.3dB at 1dB step. The output power (1dB compress point) is +15.4dBm at 70MHz. three-orders intermodulation<-54dBc(dual carrier output power 0dBm). Using the detection of satellite beacon, direction alignment of the antenna is realized easily. The detection sensitivity of the satellite beacon is -85dBm. The ODU have authentication of State Radio Regulatory Commission. The ODU has been used in××airport.At the end, some improving advices are presented based on the experiment. All of these can provide important experiment for later research on this area. |
