Research on image transmission technology in engineering site without public network based on BDS-3 short message channel

Abstract

In remote engineering sites, weak or even no signal and inadequate short message communication transmission capabilities fail to meet the requirements for image transmission, leading to the inability to transmit on-site images. The transmission of key images for infrastructure projects in remote mountainous areas without network signal coverage has long been a technical challenge.To address the above issues, this study investigates the image transmission technology based on the BDS-3 RDSS (Short Message Data Service) link. Through the RDSS image transmission protocol, the frame format of the image transmission protocol for BDS-3 satellite RDSS is designed, including communication primitives, communication processes, and interface specifications between upper and lower layers. A data compression and packet retransmission strategy based on the RDSS transmission protocol is proposed, and a package splitting and packaging scheme for BDS-3 short messages is adopted to achieve image transmission with high error correction capability and high compression ratio under narrow bandwidth. Test results show that the proposed technology can achieve image transmission in engineering sites without public network.