Design of a New Satellite VDES Communication Payload

To solve the high chain load problem of AIS and meet the needs of maritime communication, VHF data exchange system (VDES), which is applied in recent years, has been proposed and developed rapidly. This paper focuses on the important role and space-ground integration architecture of VDES, introduced the function of satellite VDES communication payload in the VDES system and the technical indicators of uplink and downlink. A suitable dynamic reception range is given for the Doppler shift generated during the relative motion between the VDES load and other parts of the architecture. Combining the functions and technical specifications of the VDES communication payload, this paper discusses the design and specific functions of the transceiver RF channel, digital baseband and power module, and interface module of the VDES communication payload. Finally, this paper gives the actual workflow of satellite VDES communication payload after orbiting, and discusses the subsequent development direction of satellite VDES communication payload.