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    基于雙網對雙網數據通信轉發處理方法

    時間:2019年03月19日 所屬分類:電子論文 點擊次數:

    摘要:雙網通信結構是保證外場測控裝備和指控中心測控計算機系統之間信息可靠傳輸的重要措施。在確保數據轉發可靠性基礎上,為使轉發的數據幀齊全且不重復,文中設計了直傳法和綜合處理法兩種雙網對雙網數據通信處理方式,這兩種處理方式已在靶場內外場通信

      摘要:雙網通信結構是保證外場測控裝備和指控中心測控計算機系統之間信息可靠傳輸的重要措施。在確保數據轉發可靠性基礎上,為使轉發的數據幀齊全且不重復,文中設計了直傳法和綜合處理法兩種雙網對雙網數據通信處理方式,這兩種處理方式已在靶場內外場通信實踐中得到了具體應用。結果表明,提出的兩種方法均具有高可靠性,能實現轉發的數據幀齊全且不重復,應用時可根據網絡結構特點加以選擇。

      關鍵詞:飛行器試驗,數據通信轉發,高可靠性,試驗信息網

    計算機與網絡

      為確保測控數據可靠傳輸,飛行器試驗測控通信系統所建立的試驗通信網和指控中心測控計算機系統的內部試驗信息網通常都為相互獨立的雙網結構[1]。在進行飛行器飛行試驗時,布設在外場各站點的測控裝備需將測控數據通過試驗通信網實時傳輸到指揮控制中心[2],由指控中心的測控計算機系統中的通信服務器接收并通過系統內部試驗信息網發送給系統內各數據處理計算機,各計算機所形成的重要數據再通過試驗信息網發送給通信服務器[3],由通信服務器通過試驗通信網發送給各測控裝備[4]。

      在上述過程中通信服務器起到了指控中心與外場裝備進行數據通信轉發作用,它分別與試驗通信網即外場雙網和試驗信息網即內場雙網共4個網連接[5-6]。當然,為提高可靠性,通信服務器的配置也是兩臺,形成“主機/副機”工作方式,即兩臺服務器同時工作,都接收并處理數據,區別是主機發送數據而副機不發送數據,主機與副機通過“心跳線”相互監視,進行主、副機切換,或通過控制節點發出控制命令進行主、副機切換[7]。

      通信服務器既要將外場雙網數據轉發給內場雙網,又要將內場雙網數據轉發給外場雙網,而無論是外場雙網還是內場雙網作為發送網,兩網所發的數據既有相同的數據又有不同的數據[8],在這種雙網對雙網數據通信轉發方式下,為確保通信服務器所轉發出的數據對于每個接收網來說既完整又不重復,本文提出了直傳法和綜合處理法兩種措施,通過設置通信服務器上的配置文件來確定使用哪種方法[9]。

      1直傳法

      該方法直接確定內場網與外場網共4個網之間數據傳遞關系,即確定從哪個網接收的數據直接從另外哪個網轉發出去,這個關系可在配置文件中設定,通信服務器按照轉發關系,進行接收數據轉發[10]。(1)確定轉發關系。有兩個方向數據轉發關系,一是內場數據向外場轉發,二是外場數據向內場轉發;(2)進行數據轉發。通信服務器按照確定的轉換關系,進行接收數據的直接轉發。

      2綜合處理法

      通信服務器從對等的雙網接收數據幀,其中大量數據幀兩兩相同,轉發時,不能向同一個網重復轉發相同數據幀,必須甩掉一幀[11-12]。該方法包含兩種甩幀方法,分別是特征數據比對法和傳輸頻率判斷法[13]。

      2.1特征數據比對法

      特征數據比對法是指對所轉發數據幀序列中具有唯一性特征的數據進行比對,發現已轉發數據幀中的特征數據有相同的值,說明該幀數據已轉發,則甩掉該數據幀。具體做法如下:(1)確定特征值。分析數據幀格式,確定數據幀中的特征數據;(2)定義特征值比對結構。用于描述數據幀最新轉發幀中的特征值;(3)進行特征值比對。通信服務器接收到數據幀后,對新舊特征值進行比對;(4)轉發處理。如果接收的新數據幀中的特征值與前一個記錄中的特征值相同,則該數據幀為舊數據幀,應拋棄;否則,為新的數據幀,向(內/外)雙網轉發,并記錄新數據幀中的特征值。

      2.2傳輸頻率判斷法

      傳輸頻率判斷法是對特征數據比對法的一種補充,是對某些數據幀中無明顯唯一特征,無法進行數據特征比對,但該數據幀卻具有固定的傳輸頻率即發送周期,比較前后相鄰兩幀數據接收時間之差,如果大于某個門限值,則是新數據幀,進行轉發;否則直接拋棄。記錄轉發數據幀的接收時間,用于進行下一幀數據比對。

      (1)確定數據幀傳輸頻率判斷值(門限)。分析傳遞的數據幀發送周期,取周期值的2/3作為接收時間間隔判斷值;(2)定義接收時間結構。用于記錄數據幀最新轉發幀的接收時間;(3)進行接收時間間隔比對。通信服務器接收到數據幀后獲取該數據幀的接收時間,與接收時間結構中記錄的時間進行比對;(4)轉發處理。如果兩個數據幀接收時間差小于門限值,則為重復幀,應拋棄;否則,為新的數據幀,向(內/外)雙網轉發,并記錄新數據幀接收時間用于后續比對。

      3轉發數據測試與結果分析

      分別通過雙內網及雙外網向通信服務器發送仿真數據,測試兩種數據轉發方式的丟包率。測試結果表明,在網絡正常的情況下,兩種數據轉發方式均高效、可靠。直傳法的優點是轉發關系有多種,每種都簡單明了,不涉及所轉發數據的內容,軟件實現過程簡單,缺點是數據轉發可靠性有所降低,4個網中一旦有一個網故障,則數據可能丟失。綜合處理法優點是不丟失數據,向每個網轉發的數據幀完整、齊全且不重復,數據轉發可靠性非常高,缺點是需了解所轉發數據的內容特征或發送特性,軟件實現過程較為復雜。

      4結束語

      在飛行器試驗中,通信服務器連接著兩個對等的外場網和兩個對等的內場網,并負責內、外場數據通信轉發。本文提出的在雙網對雙網數據通信轉發方式下的兩種數據轉發方法,其中直傳法直接確定內場網與外場網4個網之間數據傳遞關系,即確定哪個網接收的數據直接從另外哪個網轉發出去;而綜合處理法則是通過對已發送的數據幀內容或傳輸頻率進行比對分析,發送新的數據幀,拋棄已發送過的數據幀[14]。本方法已經在某飛行器試驗場測控中心計算機系統中得以應用,運行高效、可靠。

      參考文獻

      [1]黃學德.飛行器測控系統[M].北京:國防工業出版社,2000.

      [2]翟中英,閆朝星.無人機測控通信自組網技術綜述[J].遙測遙控,2018,39(4):66-73.

      [3]鄭宗漢.實時系統軟件基礎[M].北京:清華大學出版社,2003.[4]楊俊,屈景怡,吳仁彪.基于雙網的高可靠UDP通信方法[J]計算機工程與設計,2016,37(3):567-570,608.

      [5]曾秋芬,陳特放,劉毅斌.列車通信網線路冗余研究[J].計算機測量與控制,2009,17(6):1199-1200.

      [6]王學慧,靳斌,梁凱,劉亮,劉貴,王藝.雙網通信模式測控系統的研究與實現[J].現代計算機,2014(1):66-70.

      [7]李日永,金芳,鄭緒剛.測控數據傳輸服務系統設計與實現[J].計算機與網絡,2016(10):60-64.

      [8]張樹東,張蓓.基于均勻分布的機會網絡消息轉發策略[J].計算機應用與軟件,2017,34(2):164-168.

      相關期刊推薦:《計算機與網絡》(半月刊)創刊于1975年,由信息產業部電子無線通信專業情報網主辦。本刊辦刊宗旨為認真貫徹執行國家對科技期刊制定的有關政策和法規,堅持本刊的電子技術類科技期刊屬性,充分發揮本刊科技信息載體的作用,堅持立足IT業,以信息網絡為中心,計算機與通信相結合;新技術、新產品、新應用與市信息相結合,面向大眾,著眼實用;堅持普及與提高相結合,報道內容既要以普及為主,又要有一定的有技術含量的論文,以滿足各層次讀者的需要,以提高其社會效益與經濟效益。

      

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