一種基于雙向確認(rèn)的數(shù)據(jù)傳輸系統(tǒng)及方法
【技術(shù)領(lǐng)域】
[0001]本發(fā)明屬于航空航天可靠性和數(shù)據(jù)傳輸技術(shù)領(lǐng)域，特別涉及一種基于雙向確認(rèn)的數(shù)據(jù)傳輸系統(tǒng)及方法。
【背景技術(shù)】
[0002]隨著空間技術(shù)的不斷發(fā)展，航天器的功能和結(jié)構(gòu)越來(lái)越復(fù)雜，如此龐雜的系統(tǒng)按照設(shè)計(jì)者預(yù)期方式運(yùn)行的難度越來(lái)越大，隨著系統(tǒng)功能模塊的不斷增多，軟硬件相互耦合的潛在風(fēng)險(xiǎn)不斷增大，因此，各模塊之間可靠實(shí)時(shí)的并行數(shù)據(jù)傳輸對(duì)航天器可靠運(yùn)行就顯得愈加重要。由于現(xiàn)階段航天器智能化的要求，系統(tǒng)運(yùn)行依靠模塊之間定時(shí)方式或指令-響應(yīng)方式完成的數(shù)據(jù)交互，其中數(shù)據(jù)的傳輸可靠性和實(shí)時(shí)性決定系統(tǒng)模塊甚至全系統(tǒng)運(yùn)行的可靠性和安全性。如果數(shù)據(jù)傳輸環(huán)節(jié)出現(xiàn)數(shù)據(jù)丟失、數(shù)據(jù)變異或數(shù)據(jù)延時(shí)，輕則中止航天器的一次試驗(yàn)流程，重則影響航天器飛行可靠性和安全性，進(jìn)而造成大量人力、物力和財(cái)力的浪費(fèi)。因此，為航天器數(shù)據(jù)的傳輸建立一條高可靠性數(shù)據(jù)傳輸通路，從根本上保障航天器運(yùn)行可靠性就顯得尤為重要。

【發(fā)明內(nèi)容】

[0003]本發(fā)明的目的在于提供一種的適用于航天器模塊數(shù)據(jù)交互過(guò)程的基于雙向確認(rèn)的數(shù)據(jù)傳輸系統(tǒng)及方法，能夠及時(shí)容錯(cuò)并重新發(fā)起數(shù)據(jù)傳輸，保證航天器運(yùn)行過(guò)程中數(shù)據(jù)傳輸?shù)倪B續(xù)性和完整性，從而保障航天器運(yùn)行的持續(xù)性、可靠性和安全性。
[0004]實(shí)現(xiàn)本發(fā)明目的的技術(shù)方案:一種基于雙向確認(rèn)的數(shù)據(jù)傳輸系統(tǒng)，該系統(tǒng)由數(shù)據(jù)發(fā)送模塊及數(shù)據(jù)接收回傳模塊組成，數(shù)據(jù)發(fā)送模塊由數(shù)據(jù)生成模塊、數(shù)據(jù)傳輸模塊、數(shù)據(jù)傳輸3遍重傳模塊及數(shù)據(jù)比對(duì)模塊組成，數(shù)據(jù)接收回傳模塊由數(shù)據(jù)接收模塊、數(shù)據(jù)回傳3遍重傳模塊及數(shù)據(jù)回傳模塊組成；數(shù)據(jù)生成模塊生成數(shù)據(jù)，并將生成的數(shù)據(jù)傳輸給數(shù)據(jù)傳輸模塊；數(shù)據(jù)傳輸模塊等待接收數(shù)據(jù)接收模塊的數(shù)據(jù)接收請(qǐng)求，數(shù)據(jù)接收模塊通過(guò)數(shù)據(jù)傳輸3遍重傳模塊向數(shù)據(jù)傳輸模塊發(fā)送數(shù)據(jù)請(qǐng)求；數(shù)據(jù)傳輸模塊將數(shù)據(jù)進(jìn)行封裝，并將數(shù)據(jù)傳輸?shù)綌?shù)據(jù)接收模塊；數(shù)據(jù)接收模塊對(duì)數(shù)據(jù)進(jìn)行解包處理，并對(duì)數(shù)據(jù)完整性進(jìn)行判斷:若接收數(shù)據(jù)完整，則由數(shù)據(jù)回傳模塊發(fā)起數(shù)據(jù)回傳；若接收數(shù)據(jù)不完整，則數(shù)據(jù)接收模塊向數(shù)據(jù)發(fā)送模塊發(fā)起第二次數(shù)據(jù)請(qǐng)求，重新接收數(shù)據(jù)；數(shù)據(jù)回傳模塊將接收完整的數(shù)據(jù)回傳至數(shù)據(jù)發(fā)送模塊的數(shù)據(jù)比對(duì)模塊；數(shù)據(jù)比對(duì)模塊對(duì)數(shù)據(jù)回傳模塊回傳的數(shù)據(jù)進(jìn)行解包、存儲(chǔ)處理，并將回傳數(shù)據(jù)與數(shù)據(jù)傳輸模塊發(fā)送來(lái)的數(shù)據(jù)進(jìn)行逐字節(jié)比對(duì)，比對(duì)完成并向數(shù)據(jù)回傳模塊發(fā)送比對(duì)結(jié)果；若數(shù)據(jù)回傳模塊未收到比對(duì)結(jié)果，則數(shù)據(jù)回傳模塊重新向數(shù)據(jù)比對(duì)模塊回傳數(shù)據(jù)。
[0005]所述的數(shù)據(jù)傳輸3遍重傳模塊對(duì)消息進(jìn)行最多三次重發(fā)，若三次數(shù)據(jù)傳輸結(jié)束前，接收到數(shù)據(jù)接收模塊的數(shù)據(jù)接收確認(rèn)信息，則返回3遍重傳成功標(biāo)志字，則數(shù)據(jù)傳輸成功；若三次傳輸結(jié)束均未收到數(shù)據(jù)接收模塊的數(shù)據(jù)接收確認(rèn)信息，則返回3遍重傳失敗標(biāo)志字，則數(shù)據(jù)接收模塊重新向數(shù)據(jù)傳輸模塊發(fā)送數(shù)據(jù)請(qǐng)求。
[0006]所述的數(shù)據(jù)回傳3遍重傳模塊對(duì)消息進(jìn)行最多三次重發(fā)，若三次回傳結(jié)束前，接收到比對(duì)結(jié)果，則返回3遍重傳成功標(biāo)志字，則數(shù)據(jù)回傳成功；若三次回傳結(jié)束均未收到比對(duì)結(jié)果，則返回3遍重傳失敗標(biāo)志字，則數(shù)據(jù)回傳模塊重新向數(shù)據(jù)比對(duì)模塊回傳數(shù)據(jù)。
[0007]—種基于雙向確認(rèn)的數(shù)據(jù)傳輸方法，該方法包括以下步驟:
[0008]( I)數(shù)據(jù)生成模塊將生成的數(shù)據(jù)傳輸給數(shù)據(jù)傳輸模塊；
[0009](2)數(shù)據(jù)傳輸模塊與數(shù)據(jù)發(fā)送模塊之間進(jìn)行數(shù)據(jù)發(fā)送；
[0010](3)數(shù)據(jù)接收回傳模塊進(jìn)行數(shù)據(jù)接收回傳；
[0011](4)數(shù)據(jù)比對(duì)模塊將數(shù)據(jù)傳輸模塊傳輸?shù)臄?shù)據(jù)和數(shù)據(jù)回傳模塊回傳的數(shù)據(jù)進(jìn)行比對(duì)。
[0012]所述的步驟(2)中數(shù)據(jù)發(fā)送的具體步驟如下:
[0013](2.1)數(shù)據(jù)傳輸模塊將數(shù)據(jù)生成模塊傳輸?shù)臄?shù)據(jù)進(jìn)行解算，解算完畢進(jìn)行數(shù)據(jù)封裝
[0014](2.2)數(shù)據(jù)傳輸模塊等待數(shù)據(jù)接收模塊的數(shù)據(jù)接收請(qǐng)求
[0015](2.3)數(shù)據(jù)傳輸模塊接收到數(shù)據(jù)接收模塊的數(shù)據(jù)接收請(qǐng)求后，發(fā)送請(qǐng)求確認(rèn)信息，并通過(guò)數(shù)據(jù)傳輸3遍重傳模塊向數(shù)據(jù)接收模塊發(fā)送上述步驟(2.1)中已封裝的數(shù)據(jù)
[0016]數(shù)據(jù)傳輸模塊內(nèi)向數(shù)據(jù)接收模塊發(fā)送請(qǐng)求確認(rèn)信息，數(shù)據(jù)傳輸模塊每發(fā)送一幀數(shù)據(jù)，等待數(shù)據(jù)接收模塊返回接收確認(rèn)信息；若數(shù)據(jù)傳輸模塊收到確認(rèn)信息，則發(fā)送下一幀數(shù)據(jù)，直至數(shù)據(jù)發(fā)送完畢；
[0017](2.4)若數(shù)據(jù)傳輸3遍重傳返回傳輸失敗標(biāo)志字，則認(rèn)為數(shù)據(jù)傳輸模塊與數(shù)據(jù)接收模塊斷開鏈接，終止傳輸流程；數(shù)據(jù)傳輸模塊等待重新接收數(shù)據(jù)接收模塊發(fā)送的請(qǐng)求信息
[0018](2.5)若數(shù)據(jù)傳輸3遍重傳返回傳輸成功標(biāo)志字且數(shù)據(jù)傳輸完畢后，數(shù)據(jù)傳輸模塊等待數(shù)據(jù)接收模塊原樣返回的數(shù)據(jù)，每接收一幀數(shù)據(jù)，向數(shù)據(jù)接收模塊發(fā)送接收確認(rèn)信息
[0019](2.5.1)若數(shù)據(jù)接收模塊未收到完整數(shù)據(jù)，則終止發(fā)送流程，等待重新接收數(shù)據(jù)接收模塊發(fā)送的數(shù)據(jù)請(qǐng)求信息；
[0020](2.5.2)若數(shù)據(jù)接收模塊接收完整數(shù)據(jù)，則通過(guò)數(shù)據(jù)比對(duì)模塊對(duì)數(shù)據(jù)傳輸模塊發(fā)送來(lái)的數(shù)據(jù)和數(shù)據(jù)回傳模塊返回的數(shù)據(jù)進(jìn)行比對(duì)，并數(shù)據(jù)回傳模塊發(fā)送比對(duì)結(jié)果。
[0021]所述的步驟(3)中數(shù)據(jù)接收回傳的具體步驟如下:
[0022](3.1)數(shù)據(jù)接收模塊通過(guò)數(shù)據(jù)傳輸3遍重傳模塊向數(shù)據(jù)傳輸模塊發(fā)送數(shù)據(jù)請(qǐng)求
[0023](3.1.1)若數(shù)據(jù)傳輸3遍重傳模塊返回傳輸成功標(biāo)志字，則開始數(shù)據(jù)接收模塊接收數(shù)據(jù)傳輸模塊發(fā)送來(lái)的數(shù)據(jù)直至接收完畢；
[0024](3.1.2)若數(shù)據(jù)傳輸3遍重傳模塊返回傳輸失敗標(biāo)志字，則認(rèn)為數(shù)據(jù)接收模塊與數(shù)據(jù)傳輸模塊通信中斷，終止數(shù)據(jù)發(fā)送流程；
[0025](3.2)數(shù)據(jù)接收模塊接收到格式正確的每一幀數(shù)據(jù)后立即通過(guò)數(shù)據(jù)回傳模塊向數(shù)據(jù)比對(duì)模塊返回?cái)?shù)據(jù)接收確認(rèn)幀，若數(shù)據(jù)接收模塊在數(shù)據(jù)接收過(guò)程中出現(xiàn)數(shù)據(jù)丟失或格式錯(cuò)誤，則停止發(fā)送接收確認(rèn)幀
[0026](3.2.1)若數(shù)據(jù)回傳模塊接收到完整數(shù)據(jù)，按照協(xié)議封裝數(shù)據(jù)后以幀為單位通過(guò)數(shù)據(jù)回傳3遍重傳模塊向數(shù)據(jù)比對(duì)模塊返回?cái)?shù)據(jù)；數(shù)據(jù)回傳模塊每返回一幀數(shù)據(jù)，若數(shù)據(jù)回傳3遍重傳模塊返回傳輸成功標(biāo)志字，則發(fā)送下一幀直至數(shù)據(jù)完全返回；若數(shù)據(jù)回傳3遍重傳模塊返回傳輸失敗標(biāo)志字，則認(rèn)為數(shù)據(jù)回傳模塊與數(shù)據(jù)比對(duì)模塊通信中斷，終止數(shù)據(jù)回傳流程；
[0027](3.2.2)若數(shù)據(jù)回傳模塊未接收到完整數(shù)據(jù)，則認(rèn)為與數(shù)據(jù)比對(duì)模塊通信中斷，終止數(shù)據(jù)回傳流程；
[0028](3.3)數(shù)據(jù)回傳模塊向數(shù)據(jù)比對(duì)模塊回傳數(shù)據(jù)完畢后，數(shù)據(jù)回傳模塊等待接收數(shù)據(jù)比對(duì)結(jié)果信息
[0029](3.3.1)若數(shù)據(jù)回傳模塊收到數(shù)據(jù)比對(duì)模塊發(fā)送的比對(duì)結(jié)果信息，則返回比對(duì)結(jié)果確認(rèn)巾貞;
[0030](3.3.2)若數(shù)據(jù)回傳模塊未收到數(shù)據(jù)比對(duì)模塊發(fā)送的比對(duì)結(jié)果，則認(rèn)為數(shù)據(jù)回傳模塊與數(shù)據(jù)比對(duì)模塊通信中斷，終止數(shù)據(jù)回傳流程。
[0031]所述的步驟(4)中數(shù)據(jù)比對(duì)的具體步驟如下:
[0032](4.1)數(shù)據(jù)比對(duì)模塊分別打開數(shù)據(jù)傳輸模塊的數(shù)據(jù)記錄文件和數(shù)據(jù)回傳模塊返回的數(shù)據(jù)記錄文件，并分別讀取一字節(jié)數(shù)據(jù)；
[0033](4.2)判斷讀取字節(jié)的數(shù)據(jù)內(nèi)容是否均為空
[0034](4.2.1)若讀取字節(jié)的數(shù)據(jù)內(nèi)容均為空，表示文件讀取完畢，且比對(duì)未出現(xiàn)錯(cuò)誤，則結(jié)束比對(duì)流程，返回比對(duì)正確消息字；
[0035](4.2.2)若讀取字節(jié)的數(shù)據(jù)內(nèi)容不全為空，判斷數(shù)據(jù)傳輸模塊和數(shù)據(jù)回傳模讀取字節(jié)的數(shù)據(jù)內(nèi)容是否一致；若數(shù)據(jù)內(nèi)容一致，則從記錄文件中讀取下一字節(jié)數(shù)據(jù)，準(zhǔn)備比對(duì)；若數(shù)據(jù)內(nèi)容不一致，表示數(shù)據(jù)回傳過(guò)程有誤，則結(jié)束比對(duì)流程，返回比對(duì)錯(cuò)誤消息字。
[0036]本發(fā)明的有益技術(shù)效果在于:(I)通過(guò)本發(fā)明提供的適用于航天器模塊間數(shù)據(jù)交互過(guò)程的基于雙向確認(rèn)的數(shù)據(jù)傳輸系統(tǒng)及方法，數(shù)據(jù)通過(guò)請(qǐng)求-數(shù)據(jù)傳輸-確認(rèn)的流程進(jìn)行傳輸，當(dāng)傳輸環(huán)節(jié)出現(xiàn)故障，造成數(shù)據(jù)的丟失、變異或延時(shí)，系統(tǒng)可以對(duì)此類故障進(jìn)行及時(shí)處理，根據(jù)當(dāng)前傳輸狀態(tài)，重新發(fā)起指令或數(shù)據(jù)的傳輸，保證數(shù)據(jù)傳輸及航天器運(yùn)行的持續(xù)性，避免數(shù)據(jù)傳輸過(guò)程中的偶發(fā)故障引起的試驗(yàn)流程中止或運(yùn)行故障。(2)當(dāng)數(shù)據(jù)傳輸?shù)陌l(fā)送方或接收方由于通信故障未能在規(guī)定時(shí)間內(nèi)收到對(duì)方響應(yīng)時(shí)，會(huì)及時(shí)發(fā)起數(shù)據(jù)重傳，避免偶發(fā)故障引起的通信中斷，從而保證航天器模塊間數(shù)據(jù)傳輸?shù)某掷m(xù)性和數(shù)據(jù)完整性。
(3)數(shù)據(jù)接收方在接收完整數(shù)據(jù)后，將