上海(hai)時鐘服(fu)務(wu)器(qi)廠家：無論(lun)是(shi)文件服(fu)務(wu)器(qi)、郵(you)件服(fu)務(wu)器(qi)還是(shi)互聯網(wang)(wang)網(wang)(wang)關等，這些網(wang)(wang)絡中(zhong)的(de)計算機對于時間要求(qiu)都是(shi)相當精確的(de)，企業內之(zhi)所(suo)(suo)以出現同步所(suo)(suo)有計算機或服(fu)務(wu)器(qi)的(de)需求(qiu)，是(shi)因(yin)為(wei)電(dian)腦中(zhong)是(shi)石英鐘或廉價(jia)的(de)震蕩電(dian)路(lu)，誤差約每(mei)天一秒，且(qie)時累(lei)計的(de)隨(sui)著時間的(de)流逝(shi)誤差會越來越大。隨(sui)著不(bu)(bu)斷增(zeng)加(jia)的(de)分散(san)式計算和(he)我們對網(wang)(wang)絡的(de)依賴性(xing)(xing)的(de)加(jia)強，不(bu)(bu)準確的(de)電(dian)腦時間對于網(wang)(wang)絡結構以及其中(zhong)的(de)系統應用程序(xu)的(de)安全性(xing)(xing)會產生較(jiao)大的(de)影響(xiang)，尤其是(shi)那些對沒有實現時間同步而導(dao)致的(de)比(bi)較(jiao)敏感(gan)的(de)網(wang)(wang)絡指令或應用程序(xu)。NTP授(shou)時服(fu)務(wu)器(qi)時間精度高(gao)，達20nS。上海(hai)GPS網(wang)(wang)絡時鐘服(fu)務(wu)器(qi)地址

銳(rui)呈電(dian)(dian)氣是一家致力于北斗衛(wei)星(xing)同步(bu)(bu)時(shi)(shi)(shi)(shi)鐘(zhong)(zhong),GPS同步(bu)(bu)時(shi)(shi)(shi)(shi)鐘(zhong)(zhong),NTP時(shi)(shi)(shi)(shi)鐘(zhong)(zhong)服(fu)(fu)(fu)務(wu)(wu)器(qi),時(shi)(shi)(shi)(shi)間(jian)同步(bu)(bu)服(fu)(fu)(fu)務(wu)(wu)器(qi),網絡(luo)(luo)授(shou)時(shi)(shi)(shi)(shi)服(fu)(fu)(fu)務(wu)(wu)器(qi),GPS對時(shi)(shi)(shi)(shi)裝置(zhi),GPS校(xiao)時(shi)(shi)(shi)(shi)服(fu)(fu)(fu)務(wu)(wu)器(qi),GPS北斗雙模時(shi)(shi)(shi)(shi)鐘(zhong)(zhong)系(xi)統,子母鐘(zhong)(zhong)系(xi)統的(de)研發、生產和(he)銷售(shou)的(de)企業(ye)。CDMA網絡(luo)(luo)時(shi)(shi)(shi)(shi)鐘(zhong)(zhong)的(de)技術參數1.網絡(luo)(luo)協(xie)議(RFC1119&1305)SNTP(RFC2030)Telnet（RFC854）FTP（RFC959）2.輸(shu)入/輸(shu)出接(jie)口(kou)網口(kou)：RJ-45，4路(lu)，10/100自(zi)適(shi)應以太(tai)網接(jie)口(kou)Console：RJ-45，1路(lu)，RS232電(dian)(dian)平GPS、北斗天線輸(shu)入：BNC，1路(lu)選(xuan)配(pei)：10MHz、E1、B碼、RS232/422/485、PPS、NTP、DCF773.顯示(shi)面板顯示(shi)年(nian)月日時(shi)(shi)(shi)(shi)分秒(miao)和(he)GPS、北斗收(shou)星(xing)情況等(deng)信息指(zhi)示(shi)燈(deng)指(zhi)示(shi)電(dian)(dian)源(yuan)、GPS、北斗、鎖定、保持(chi)、1PPS等(deng)狀態信息4.時(shi)(shi)(shi)(shi)間(jian)服(fu)(fu)(fu)務(wu)(wu)功能CDMA網絡(luo)(luo)時(shi)(shi)(shi)(shi)鐘(zhong)(zhong)參考模式(shi)，網絡(luo)(luo)時(shi)(shi)(shi)(shi)間(jian)服(fu)(fu)(fu)務(wu)(wu)器(qi)用(yong)戶(hu)終端(duan)同步(bu)(bu)授(shou)時(shi)(shi)(shi)(shi)精(jing)度：用(yong)戶(hu)容(rong)量：無(wu)限制NTP請求量：10000次/秒(miao)同步(bu)(bu)于其(qi)他NTP服(fu)(fu)(fu)務(wu)(wu)器(qi)GPS關閉后時(shi)(shi)(shi)(shi)間(jian)保持(chi)精(jing)度(選(xuan)件(jian))12并行通道GPS接(jie)收(shou)機(ji)UTC同步(bu)(bu)精(jing)度：30ns（1б）接(jie)收(shou)L1,C/A碼信號6.北斗。浙江CDMA網絡(luo)(luo)校(xiao)時(shi)(shi)(shi)(shi)服(fu)(fu)(fu)務(wu)(wu)器(qi)NTP授(shou)時(shi)(shi)(shi)(shi)服(fu)(fu)(fu)務(wu)(wu)器(qi)可根據(ju)用(yong)戶(hu)的(de)要求，電(dian)(dian)源(yuan)可使用(yong)網絡(luo)(luo)提供，也可采用(yong)外置(zhi)電(dian)(dian)源(yuan)。

我公司生(sheng)(sheng)產的(de)(de)GPS授(shou)時(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置(zhi)(zhi)在新疆(jiang)慶華能(neng)(neng)源集團有(you)(you)限公司成(cheng)功投運GPS授(shou)時(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置(zhi)(zhi)(北斗(dou)衛(wei)星(xing)(xing)授(shou)時(shi)(shi)(shi)(shi),NTP同(tong)步(bu)時(shi)(shi)(shi)(shi)鐘,GPS校時(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置(zhi)(zhi))是(shi)我公司開發研制(zhi)(zhi)的(de)(de)應(ying)(ying)用GPS北斗(dou)技術(shu)授(shou)時(shi)(shi)(shi)(shi)的(de)(de)標準(zhun)時(shi)(shi)(shi)(shi)間(jian)顯示(shi)和(he)發送的(de)(de)裝(zhuang)(zhuang)(zhuang)置(zhi)(zhi)，該裝(zhuang)(zhuang)(zhuang)置(zhi)(zhi)以(yi)GPS北斗(dou)為時(shi)(shi)(shi)(shi)間(jian)基準(zhun)，可以(yi)同(tong)時(shi)(shi)(shi)(shi)視(shi)場范圍內(nei)24顆(ke)衛(wei)星(xing)(xing)，對(dui)時(shi)(shi)(shi)(shi)精(jing)(jing)度達20nS。GPS授(shou)時(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置(zhi)(zhi)采用SMT表面貼(tie)裝(zhuang)(zhuang)(zhuang)技術(shu)生(sheng)(sheng)產，以(yi)高(gao)速芯片進行控制(zhi)(zhi)，無(wu)硬盤和(he)風(feng)扇設計(ji)，精(jing)(jing)度高(gao)、穩定性好、功能(neng)(neng)強、無(wu)積(ji)累誤差、不(bu)受地域氣候等環境條(tiao)件限制(zhi)(zhi)、性價(jia)比高(gao)、操(cao)作(zuo)簡單(dan)、全自動智能(neng)(neng)化運行，免操(cao)作(zuo)維護，適(shi)合無(wu)人值守。GPS授(shou)時(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置(zhi)(zhi)有(you)(you)標準(zhun)RS232、RS422/485、脈沖(chong)、IRIG-B、DCF77、NTP/SNTP、IEEE1588協議網絡(luo)對(dui)時(shi)(shi)(shi)(shi)等接口形式，可以(yi)適(shi)應(ying)(ying)各(ge)種不(bu)同(tong)設備(bei)的(de)(de)對(dui)時(shi)(shi)(shi)(shi)需(xu)要，廣(guang)泛應(ying)(ying)用于電力(li)、金(jin)融、通(tong)信、交通(tong)、廣(guang)電、安防、石化、冶金(jin)、水(shui)利(li)、、醫療、教(jiao)育、機關、IT等領域。銳(rui)呈電氣是(shi)一家致力(li)于北斗(dou)衛(wei)星(xing)(xing)同(tong)步(bu)時(shi)(shi)(shi)(shi)鐘,GPS同(tong)步(bu)時(shi)(shi)(shi)(shi)鐘,NTP時(shi)(shi)(shi)(shi)鐘服(fu)務(wu)(wu)器,時(shi)(shi)(shi)(shi)間(jian)同(tong)步(bu)服(fu)務(wu)(wu)器,網絡(luo)授(shou)時(shi)(shi)(shi)(shi)服(fu)務(wu)(wu)器,GPS對(dui)時(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置(zhi)(zhi),GPS校時(shi)(shi)(shi)(shi)服(fu)務(wu)(wu)器,GPS北斗(dou)雙(shuang)模時(shi)(shi)(shi)(shi)鐘系統,子母鐘系統的(de)(de)研發、生(sheng)(sheng)產和(he)銷售的(de)(de)企(qi)業(ye)。

NTP（NetworkTimeProtocol）屬于(yu)應(ying)用(yong)(yong)(yong)層協議(yi)（基于(yu)UDP傳(chuan)輸，使用(yong)(yong)(yong)的(de)(de)(de)(de)(de)(de)端(duan)(duan)口(kou)號為(wei)123），用(yong)(yong)(yong)來同(tong)(tong)步網(wang)(wang)絡(luo)中(zhong)(zhong)分布式時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)服務(wu)器(qi)和客戶(hu)端(duan)(duan)之間(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)，使網(wang)(wang)絡(luo)中(zhong)(zhong)的(de)(de)(de)(de)(de)(de)設(she)(she)備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)提供基于(yu)統(tong)(tong)一(yi)(yi)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)應(ying)用(yong)(yong)(yong)成為(wei)可能(neng)(neng)。時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)服務(wu)器(qi)和客戶(hu)端(duan)(duan)是相對的(de)(de)(de)(de)(de)(de)。提供時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)標準(zhun)的(de)(de)(de)(de)(de)(de)設(she)(she)備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)為(wei)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)服務(wu)器(qi)，接收時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)服務(wu)的(de)(de)(de)(de)(de)(de)設(she)(she)備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)為(wei)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)客戶(hu)端(duan)(duan)。設(she)(she)備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)運(yun)行(xing)NTP之后，通(tong)過交換NTP報(bao)文，既可以作為(wei)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)服務(wu)器(qi)提供時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)標準(zhun)，又可以作為(wei)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)客戶(hu)端(duan)(duan)接收時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)服務(wu)。NTP應(ying)用(yong)(yong)(yong)1）應(ying)用(yong)(yong)(yong)環境NTP主(zhu)要(yao)(yao)(yao)應(ying)用(yong)(yong)(yong)于(yu)需(xu)要(yao)(yao)(yao)網(wang)(wang)絡(luo)中(zhong)(zhong)所(suo)(suo)有主(zhu)機或設(she)(she)備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)鐘(zhong)保持一(yi)(yi)致(zhi)的(de)(de)(de)(de)(de)(de)場(chang)合，比如(ru)：2）網(wang)(wang)絡(luo)管理對不同(tong)(tong)設(she)(she)備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)采集(ji)來的(de)(de)(de)(de)(de)(de)日志信息(xi)、調試信息(xi)進行(xing)分析(xi)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)，需(xu)要(yao)(yao)(yao)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)間(jian)(jian)(jian)(jian)依據。3）計(ji)費系(xi)(xi)統(tong)(tong)計(ji)費系(xi)(xi)統(tong)(tong)要(yao)(yao)(yao)求所(suo)(suo)有設(she)(she)備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)(de)(de)(de)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)鐘(zhong)一(yi)(yi)致(zhi)。4）完成某(mou)些功(gong)能(neng)(neng)如(ru)定(ding)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)重啟網(wang)(wang)絡(luo)中(zhong)(zhong)的(de)(de)(de)(de)(de)(de)所(suo)(suo)有設(she)(she)備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)，要(yao)(yao)(yao)求所(suo)(suo)有設(she)(she)備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)的(de)(de)(de)(de)(de)(de)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)鐘(zhong)保持一(yi)(yi)致(zhi)。5）多系(xi)(xi)統(tong)(tong)協同(tong)(tong)處理事件為(wei)保證(zheng)正確的(de)(de)(de)(de)(de)(de)執行(xing)順序，多個(ge)系(xi)(xi)統(tong)(tong)必(bi)須參(can)考同(tong)(tong)一(yi)(yi)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)鐘(zhong)。5）在備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)份(fen)服務(wu)器(qi)和客戶(hu)機之間(jian)(jian)(jian)(jian)進行(xing)增量備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)份(fen)要(yao)(yao)(yao)求備(bei)(bei)(bei)(bei)(bei)(bei)(bei)(bei)份(fen)服務(wu)器(qi)和所(suo)(suo)有客戶(hu)端(duan)(duan)之間(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)(de)時(shi)(shi)(shi)(shi)(shi)(shi)(shi)鐘(zhong)同(tong)(tong)步。IEEE1588時(shi)(shi)(shi)(shi)(shi)(shi)(shi)鐘(zhong)能(neng)(neng)對報(bao)文的(de)(de)(de)(de)(de)(de)數(shu)據內(nei)容(rong)做了(le)定(ding)義。

K801主(zhu)時鐘(zhong)(zhong)采(cai)用(yong)(yong)表面貼裝技術(shu)生產，大規模集成電(dian)(dian)(dian)路設(she)計(ji)，以高(gao)速(su)芯片(pian)進行(xing)控制，具(ju)有精(jing)度高(gao)、穩定性好、功(gong)能強、無(wu)積累誤差、不受地域(yu)氣候等環(huan)境(jing)條(tiao)件限制、性價比高(gao)、操作(zuo)簡單等特點，全自(zi)動智能化(hua)運行(xing)，免(mian)操作(zuo)維護，適(shi)合無(wu)人值(zhi)守(shou)。K801主(zhu)時鐘(zhong)(zhong)采(cai)用(yong)(yong)全模塊(kuai)化(hua)結構(gou)設(she)計(ji)，其(qi)輸入、輸出、電(dian)(dian)(dian)源等均(jun)可靈(ling)活配置，并具(ju)有豐富的各(ge)類模塊(kuai)及(ji)板卡供選擇(ze)(ze)（特殊需求(qiu)可提供定制服(fu)務(wu)(wu)），對時信號的種(zhong)類和數量都可根據需要(yao)(yao)靈(ling)活選擇(ze)(ze)配置。裝置有標(biao)準(zhun)RS232、RS422/485、脈沖(chong)、IRIG-B、DCF77、NTP/SNTP、PTP協議時間(jian)輸出等接口形式，可以適(shi)應(ying)各(ge)種(zhong)不同設(she)備的對時需要(yao)(yao)，廣泛應(ying)用(yong)(yong)于(yu)電(dian)(dian)(dian)力、金(jin)融、通信、交通、廣電(dian)(dian)(dian)、安(an)防、石化(hua)、冶金(jin)、水利(li)、、醫療、教育、機關、IT等領域(yu)。NTP授時服(fu)務(wu)(wu)器(qi)(qi)電(dian)(dian)(dian)子鐘(zhong)(zhong)嵌入式安(an)裝方便(bian)，施工簡單，操作(zuo)簡單，免(mian)維護。浙江NTP網絡時鐘(zhong)(zhong)服(fu)務(wu)(wu)器(qi)(qi)搭(da)建

NTP授時服務(wu)(wu)器雙CPU同時工(gong)作，32位CPU雙核(he)處理(li)器，性(xing)能極大提高。上海GPS網(wang)絡時鐘服務(wu)(wu)器地址

NTP安全(quan)(quan)嗎(ma)？遺憾的(de)是，NTP很容易受(shou)到網絡中間(jian)人(ren)(MITM)攻(gong)擊(ji)。這(zhe)是惡(e)意行為(wei)者位于您(nin)和(he)NTP服(fu)務(wu)(wu)器(qi)之間(jian)、對話(hua)、偽造消息并向(xiang)您(nin)謊報時(shi)(shi)間(jian)的(de)地方。這(zhe)有(you)多嚴重？由(you)于許多過程都依賴于確(que)定(ding)準確(que)的(de)時(shi)(shi)間(jian)，因(yin)此后果確(que)實非(fei)常嚴重。它們可以包括：建立加(jia)密(mi)會話(hua)的(de)問(wen)題，例如傳輸(shu)層安全(quan)(quan)(TLS)日志和(he)交易上(shang)的(de)時(shi)(shi)間(jian)戳(chuo)不(bu)正確(que)，可能支持(chi)活動或幫助(zhu)掩飾(shi)其他犯罪行為(wei)身份(fen)驗(yan)(yan)證(zheng)問(wen)題、攻(gong)擊(ji)和(he)身份(fen)驗(yan)(yan)證(zheng)安全(quan)(quan)措(cuo)施問(wen)（例如Kerberos）DNS安全(quan)(quan)(DNSSEC)問(wen)題NTP版本3引(yin)入了對使用預共享密(mi)鑰的(de)對稱(cheng)身份(fen)驗(yan)(yan)證(zheng)的(de)支持(chi)，但(dan)在(zai)現代人(ren)眼中這(zhe)看起來非(fei)常過時(shi)(shi)。這(zhe)意味著您(nin)必須(xu)將一個新的(de)密(mi)鑰分發(fa)給(gei)您(nin)想與之交談的(de)每個對等方。這(zhe)在(zai)不(bu)太現實，尤(you)其是在(zai)運(yun)行像大型公共NTP服(fu)務(wu)(wu)時(shi)(shi)。上(shang)海GPS網絡時(shi)(shi)鐘服(fu)務(wu)(wu)器(qi)地址

上(shang)海銳呈(cheng)電(dian)(dian)氣有(you)限公司(si)正式組建于2007-04-18，將(jiang)通過(guo)提供以GPS北斗(dou)(dou)(dou)同(tong)(tong)(tong)步(bu)時(shi)(shi)(shi)鐘(zhong)，NTP時(shi)(shi)(shi)間(jian)服(fu)(fu)務(wu)(wu)器(qi)，GPS校時(shi)(shi)(shi)器(qi)，北斗(dou)(dou)(dou)授時(shi)(shi)(shi)系(xi)(xi)統(tong)等服(fu)(fu)務(wu)(wu)于于一(yi)(yi)體的(de)組合(he)服(fu)(fu)務(wu)(wu)。旗下銳呈(cheng)在(zai)安(an)(an)全(quan)、防護(hu)(hu)行(xing)(xing)(xing)業(ye)擁有(you)一(yi)(yi)定(ding)的(de)地位，品牌(pai)價值(zhi)持(chi)續增長(chang)，有(you)望成為行(xing)(xing)(xing)業(ye)中(zhong)的(de)佼(jiao)佼(jiao)者。我(wo)們在(zai)發(fa)展業(ye)務(wu)(wu)的(de)同(tong)(tong)(tong)時(shi)(shi)(shi)，進一(yi)(yi)步(bu)推動了品牌(pai)價值(zhi)完善。隨著業(ye)務(wu)(wu)能力的(de)增長(chang)，以及品牌(pai)價值(zhi)的(de)提升，也逐漸形成安(an)(an)全(quan)、防護(hu)(hu)綜合(he)一(yi)(yi)體化能力。上(shang)海銳呈(cheng)電(dian)(dian)氣有(you)限公司(si)業(ye)務(wu)(wu)范圍涉及上(shang)海銳呈(cheng)電(dian)(dian)氣有(you)限公司(si)主營GPS北斗(dou)(dou)(dou)衛(wei)星同(tong)(tong)(tong)步(bu)時(shi)(shi)(shi)鐘(zhong)，NTP時(shi)(shi)(shi)間(jian)服(fu)(fu)務(wu)(wu)器(qi)。公司(si)自(zi)主研發(fa)的(de)GPS（北斗(dou)(dou)(dou)）衛(wei)星同(tong)(tong)(tong)步(bu)時(shi)(shi)(shi)鐘(zhong)已(yi)被幾千個系(xi)(xi)統(tong)集成商配套使用；電(dian)(dian)廠(chang)/變(bian)電(dian)(dian)站時(shi)(shi)(shi)間(jian)同(tong)(tong)(tong)步(bu)系(xi)(xi)統(tong)已(yi)在(zai)上(shang)百個電(dian)(dian)廠(chang)/變(bian)電(dian)(dian)站安(an)(an)裝運(yun)行(xing)(xing)(xing)；NTP時(shi)(shi)(shi)間(jian)服(fu)(fu)務(wu)(wu)器(qi)(GPS時(shi)(shi)(shi)鐘(zhong)服(fu)(fu)務(wu)(wu)器(qi)，時(shi)(shi)(shi)間(jian)同(tong)(tong)(tong)步(bu)服(fu)(fu)務(wu)(wu)器(qi))在(zai)國內外各行(xing)(xing)(xing)業(ye)近(jin)萬個現場(chang)穩定(ding)運(yun)行(xing)(xing)(xing)。等多個環節，在(zai)國內安(an)(an)全(quan)、防護(hu)(hu)行(xing)(xing)(xing)業(ye)擁有(you)綜合(he)優勢。在(zai)GPS北斗(dou)(dou)(dou)同(tong)(tong)(tong)步(bu)時(shi)(shi)(shi)鐘(zhong)，NTP時(shi)(shi)(shi)間(jian)服(fu)(fu)務(wu)(wu)器(qi)，GPS校時(shi)(shi)(shi)器(qi)，北斗(dou)(dou)(dou)授時(shi)(shi)(shi)系(xi)(xi)統(tong)等領域完成了眾多可靠項目。

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