熊啟龍

(水利部淮河水利委員會水文局(信息中心)，安徽 蚌埠 233001)

　　摘 要：針對遙測站采用水利行業規約傳輸圖片效率較低等問題，為在水文自動測報系統中基于移動通信網絡或有線嵌入式以太網靈活、高效地傳輸圖片，介紹遙測站的數據特點、拍攝圖片的常用壓縮格式和傳輸方式，研究在遙測終端機中應用HTTP協議傳輸圖片的過程。采用HTTP協議，將遙測終端機作為客戶端與服務器建立起TCP連接，應用層按照HTTP協議將要發送的信息組織成請求報文進行發送，不考慮數據分包、失敗重傳和數據校驗機制，由下層TCP/IP協議負責數據可靠傳輸，服務器將接收的二進制流數據保存成圖片。相較于2種水利行業規約，采用HTTP協議傳輸圖片，時效性更強，可以兼容很多互聯網的通信應用，方便與各種服務接口對接。

　　關鍵詞：圖片傳輸;HTTP協議;遙測站;遙測終端機;TCP/IP協議;報文正文;水利行業;規約

　　Application research on HTTP protocol based image transmission

　　in telemetry station

　　XIONG Qilong

　　(Information Center of the Huaihe River Commission, Ministry of Water Resources, Bengbu 233001, China)

　　Abstract: In view of the problems of low efficiency of image transmission by using water conservancy industry protocol in telemetry station, this paper introduces the data characteristics, images common compression format and transmission mode taken by telemetry station, and studies the process of transmitting images by using HTTP protocol in telemetry terminal, in order to flexibly and efficiently transmit images based on mobile communication network or wired embedded Ethernet in automatic hydrological monitoring and reporting system. Using HTTP protocol, the telemetry terminal is used as the client to establish a TCP connection with the server. Application layer organizes the information to be sent into request messages according to HTTP protocol. Regardless of data subcontracting, failure retransmission or data verification mechanism, the lower TCP/IP protocol is responsible for reliable data transmission, and the server saves the received binary stream data as a picture. Compared with the two water conservancy industry protocols, HTTP protocol is used to transmit pictures, which has stronger timeliness, can be compatible with many Internet communication applications, and is convenient to connect with various service interfaces.

　　Key words：picture transmission; HTTP protocol; telemetry station; telemetry terminal; TCP/IP protocol; message body; water conservancy industry; protocols