衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)定(ding)(ding)位(wei)(wei)系(xi)(xi)(xi)統(tong)(tong)(tong)就是(shi)利用(yong)(yong)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)進行無(wu)線電定(ding)(ding)位(wei)(wei)的(de)(de)(de)(de)系(xi)(xi)(xi)統(tong)(tong)(tong)（positioningsystembysatellite）。可(ke)分為靜(jing)(jing)(jing)止(zhi)(zhi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)定(ding)(ding)位(wei)(wei)系(xi)(xi)(xi)統(tong)(tong)(tong)和非靜(jing)(jing)(jing)止(zhi)(zhi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)定(ding)(ding)位(wei)(wei)系(xi)(xi)(xi)統(tong)(tong)(tong)兩大類(lei)。靜(jing)(jing)(jing)止(zhi)(zhi)軌(gui)道衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)定(ding)(ding)位(wei)(wei)系(xi)(xi)(xi)統(tong)(tong)(tong)一般(ban)采用(yong)(yong)有(you)源定(ding)(ding)位(wei)(wei)方式，是(shi)由相距較(jiao)遠（衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)與(yu)地心(xin)(xin)連線的(de)(de)(de)(de)夾角(jiao)應(ying)大于30°）的(de)(de)(de)(de)2顆或(huo)3顆靜(jing)(jing)(jing)止(zhi)(zhi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)、中心(xin)(xin)地球站(zhan)及移動用(yong)(yong)戶(hu)(hu)終端(duan)(duan)組成(cheng)(cheng)。當已知靜(jing)(jing)(jing)止(zhi)(zhi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)位(wei)(wei)置、用(yong)(yong)戶(hu)(hu)的(de)(de)(de)(de)海拔(ba)標(biao)(biao)高(gao)，并(bing)能(neng)(neng)(neng)測得2顆或(huo)3顆靜(jing)(jing)(jing)止(zhi)(zhi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)到(dao)用(yong)(yong)戶(hu)(hu)終端(duan)(duan)的(de)(de)(de)(de)距離，從而(er)根據(ju)幾何學三維(wei)(wei)坐標(biao)(biao)確定(ding)(ding)位(wei)(wei)置的(de)(de)(de)(de)原理可(ke)對(dui)移動用(yong)(yong)戶(hu)(hu)終端(duan)(duan)進行定(ding)(ding)位(wei)(wei)。2顆靜(jing)(jing)(jing)止(zhi)(zhi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)構(gou)(gou)成(cheng)(cheng)的(de)(de)(de)(de)定(ding)(ding)位(wei)(wei)系(xi)(xi)(xi)統(tong)(tong)(tong)只能(neng)(neng)(neng)獲得用(yong)(yong)戶(hu)(hu)的(de)(de)(de)(de)二維(wei)(wei)坐標(biao)(biao)，因(yin)此需要(yao)知道用(yong)(yong)戶(hu)(hu)的(de)(de)(de)(de)海拔(ba)標(biao)(biao)高(gao)。3顆靜(jing)(jing)(jing)止(zhi)(zhi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)構(gou)(gou)成(cheng)(cheng)的(de)(de)(de)(de)定(ding)(ding)位(wei)(wei)系(xi)(xi)(xi)統(tong)(tong)(tong)可(ke)直接獲得用(yong)(yong)戶(hu)(hu)的(de)(de)(de)(de)三維(wei)(wei)坐標(biao)(biao)。該系(xi)(xi)(xi)統(tong)(tong)(tong)的(de)(de)(de)(de)定(ding)(ding)位(wei)(wei)精度(du)誤差一般(ban)在(zai)幾十(shi)米，距離赤(chi)道越近誤差越大，可(ke)達(da)百余米。對(dui)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)的(de)(de)(de)(de)仰角(jiao)過(guo)小的(de)(de)(de)(de)高(gao)緯(wei)度(du)地區(qu)或(huo)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)非覆蓋區(qu)，靜(jing)(jing)(jing)止(zhi)(zhi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)定(ding)(ding)位(wei)(wei)系(xi)(xi)(xi)統(tong)(tong)(tong)不(bu)能(neng)(neng)(neng)定(ding)(ding)位(wei)(wei)。在(zai)有(you)源定(ding)(ding)位(wei)(wei)方式中，用(yong)(yong)戶(hu)(hu)終端(duan)(duan)應(ying)具(ju)有(you)收發能(neng)(neng)(neng)力和應(ying)答(da)功(gong)(gong)能(neng)(neng)(neng)。中心(xin)(xin)站(zhan)通過(guo)測量用(yong)(yong)戶(hu)(hu)的(de)(de)(de)(de)應(ying)答(da)信(xin)號(hao)經(jing)不(bu)同衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)(xing)返回的(de)(de)(de)(de)時(shi)間(jian)，可(ke)求出(chu)移動用(yong)(yong)戶(hu)(hu)的(de)(de)(de)(de)三維(wei)(wei)空間(jian)坐標(biao)(biao)，自動給出(chu)經(jing)度(du)和緯(wei)度(du)顯示(shi)，從而(er)實現中心(xin)(xin)站(zhan)對(dui)用(yong)(yong)戶(hu)(hu)的(de)(de)(de)(de)定(ding)(ding)位(wei)(wei)。這種系(xi)(xi)(xi)統(tong)(tong)(tong)，通常在(zai)完(wan)成(cheng)(cheng)定(ding)(ding)位(wei)(wei)的(de)(de)(de)(de)同時(shi)，還具(ju)有(you)一定(ding)(ding)的(de)(de)(de)(de)雙(shuang)向數據(ju)傳輸(shu)功(gong)(gong)能(neng)(neng)(neng)。適用(yong)(yong)于大范圍移動車輛的(de)(de)(de)(de)調度(du)。因(yin)為是(shi)有(you)源定(ding)(ding)位(wei)(wei)。NTP授時(shi)服務器(qi)能(neng)(neng)(neng)夠智能(neng)(neng)(neng)判別GPS信(xin)號(hao)、北斗(dou)信(xin)號(hao)、外部B碼、NTP輸(shu)入時(shi)間(jian)基準信(xin)號(hao)的(de)(de)(de)(de)穩定(ding)(ding)性和優劣。網絡時(shi)鐘同步服務器(qi)

NTP網絡(luo)時(shi)(shi)(shi)(shi)(shi)鐘(zhong)(zhong)服(fu)務(wu)(wu)(wu)器(qi)特點：1．精度高，同(tong)(tong)步快。2．雙(shuang)CPU同(tong)(tong)時(shi)(shi)(shi)(shi)(shi)工作，32位CPU雙(shuang)核處(chu)理器(qi)，性能(neng)(neng)提高。3．支(zhi)持單星(xing)授時(shi)(shi)(shi)(shi)(shi)模式，適用于收星(xing)效果不(bu)佳的(de)(de)情況。4．具備內部守時(shi)(shi)(shi)(shi)(shi)功能(neng)(neng)，24小時(shi)(shi)(shi)(shi)(shi)自保持能(neng)(neng)力不(bu)超過1mS。5．可同(tong)(tong)時(shi)(shi)(shi)(shi)(shi)為(wei)上萬臺服(fu)務(wu)(wu)(wu)器(qi)、工作站、DVR、NVR提供時(shi)(shi)(shi)(shi)(shi)間戳服(fu)務(wu)(wu)(wu)。6．支(zhi)持WINDOWS、LINUX、UNIX、SUNSOLARIS、IBMAIX、HP-UX等操作系(xi)統及支(zhi)持NTP協(xie)議的(de)(de)路由(you)器(qi)、交換機(ji)等網絡(luo)設備。7．嵌入式系(xi)統，無(wu)硬盤和風扇(shan)設計(ji)(ji)(ji)，防震設計(ji)(ji)(ji)，系(xi)統穩(wen)定可靠。8．工業級元件(jian)，高水準的(de)(de)電(dian)(dian)氣(qi)設計(ji)(ji)(ji)，高密(mi)度集(ji)成的(de)(de)電(dian)(dian)路結(jie)構，使裝(zhuang)置(zhi)擁有(you)電(dian)(dian)氣(qi)隔離和電(dian)(dian)磁屏蔽表現，整機(ji)無(wu)可調(diao)節(jie)器(qi)件(jian)，提高了裝(zhuang)置(zhi)的(de)(de)抗干擾(rao)性能(neng)(neng)與可靠性保障。上海銳呈電(dian)(dian)氣(qi)有(you)限公司是(shi)一家致(zhi)力于北斗(dou)衛星(xing)同(tong)(tong)步時(shi)(shi)(shi)(shi)(shi)鐘(zhong)(zhong),GPS同(tong)(tong)步時(shi)(shi)(shi)(shi)(shi)鐘(zhong)(zhong),NTP時(shi)(shi)(shi)(shi)(shi)鐘(zhong)(zhong)服(fu)務(wu)(wu)(wu)器(qi),時(shi)(shi)(shi)(shi)(shi)間同(tong)(tong)步服(fu)務(wu)(wu)(wu)器(qi),網絡(luo)授時(shi)(shi)(shi)(shi)(shi)服(fu)務(wu)(wu)(wu)器(qi),GPS對時(shi)(shi)(shi)(shi)(shi)裝(zhuang)置(zhi),GPS校時(shi)(shi)(shi)(shi)(shi)服(fu)務(wu)(wu)(wu)器(qi),GPS北斗(dou)雙(shuang)模時(shi)(shi)(shi)(shi)(shi)鐘(zhong)(zhong)系(xi)統,子(zi)母鐘(zhong)(zhong)系(xi)統的(de)(de)研發、生(sheng)產(chan)和銷(xiao)售的(de)(de)企業。浙江GPS網絡(luo)時(shi)(shi)(shi)(shi)(shi)間服(fu)務(wu)(wu)(wu)器(qi)ip地址(zhi)NTP授時(shi)(shi)(shi)(shi)(shi)服(fu)務(wu)(wu)(wu)器(qi)顯示醒(xing)目清晰、故障時(shi)(shi)(shi)(shi)(shi)黑屏不(bu)會對使用者產(chan)生(sheng)誤導(dao)。

◆具(ju)有可(ke)(ke)擴展無限個單獨的物理(li)(li)隔(ge)離(li)10/100M網口(kou)(kou)（每(mei)個端口(kou)(kou)具(ju)有單獨的MAC地(di)址），每(mei)個網口(kou)(kou)可(ke)(ke)以靈(ling)活的配(pei)置(zhi)(zhi)(zhi)使用(yong)，可(ke)(ke)以用(yong)在(zai)不(bu)(bu)同(tong)(tong)的子(zi)網和物理(li)(li)隔(ge)離(li)網絡里；◆作(zuo)一級(ji)時(shi)(shi)間服(fu)(fu)務器(qi)，可(ke)(ke)同(tong)(tong)時(shi)(shi)為上萬臺(tai)客戶(hu)端、服(fu)(fu)務器(qi)、工作(zuo)站提(ti)供時(shi)(shi)間服(fu)(fu)務。◆支(zhi)持WINDOWS9X/NT/2000/XP/2003/vista、LINUX、UNIX、SUNSOLARIS、IBMAIX、HP-UX等操作(zuo)系(xi)(xi)統及(ji)支(zhi)持NTP協(xie)議的所有網絡設(she)備。◆多(duo)種(zhong)配(pei)置(zhi)(zhi)(zhi)方(fang)法（TELNET/WEB），易于管理(li)(li)和升級(ji)，支(zhi)持MD5加密和SNMP網管；◆設(she)備支(zhi)持NTP和SNTP協(xie)議，且(qie)提(ti)供IBIG-B碼互備信(xin)號(hao)(hao)(hao)接(jie)口(kou)(kou)，要實現計算機網絡及(ji)其網絡設(she)備無需(xu)額外編(bian)程(cheng)便(bian)可(ke)(ke)自動同(tong)(tong)步時(shi)(shi)間。◆支(zhi)持電源中斷、GPS失歩干接(jie)點信(xin)號(hao)(hao)(hao)告警（訂貨時(shi)(shi)須說(shuo)明）。◆專門去(qu)用(yong)嵌入(ru)式(shi)系(xi)(xi)統，無硬盤和風扇設(she)計，防(fang)震(zhen)設(she)計，系(xi)(xi)統穩定可(ke)(ke)靠。◆機箱經(jing)防(fang)磁處理(li)(li)，抗干擾能(neng)力強(qiang)。◆GPS接(jie)收(shou)天線(xian)重(zhong)點考(kao)慮了防(fang)雷設(she)計、穩定性設(she)計、抗干擾設(she)計，信(xin)號(hao)(hao)(hao)接(jie)收(shou)可(ke)(ke)靠性高(gao)，不(bu)(bu)受地(di)域條(tiao)件和環境(jing)的限制。◆裝(zhuang)置(zhi)(zhi)(zhi)具(ju)有多(duo)種(zhong)串行信(xin)息輸出與交互方(fang)式(shi)，以滿足不(bu)(bu)同(tong)(tong)用(yong)戶(hu)的需(xu)求。◆串口(kou)(kou)信(xin)號(hao)(hao)(hao)輸出可(ke)(ke)編(bian)程(cheng)，按(an)鍵設(she)置(zhi)(zhi)(zhi),操作(zuo)方(fang)便(bian)。◆裝(zhuang)置(zhi)(zhi)(zhi)可(ke)(ke)通過數碼管在(zai)線(xian)顯示當(dang)前收(shou)星個數，直觀反映(ying)裝(zhuang)置(zhi)(zhi)(zhi)的同(tong)(tong)步狀況。◆機架式(shi)結(jie)構，1U/2U、19”標準機箱,安裝(zhuang)方(fang)便(bian)。

我(wo)公(gong)司(si)生(sheng)(sheng)產(chan)的(de)(de)GPS授(shou)(shou)(shou)時(shi)(shi)(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置在新(xin)疆慶(qing)華(hua)能源集(ji)團有限(xian)公(gong)司(si)成功(gong)投(tou)運GPS授(shou)(shou)(shou)時(shi)(shi)(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置(北斗衛(wei)星(xing)授(shou)(shou)(shou)時(shi)(shi)(shi)(shi)(shi)(shi),NTP同步時(shi)(shi)(shi)(shi)(shi)(shi)鐘(zhong),GPS校(xiao)時(shi)(shi)(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置)是我(wo)公(gong)司(si)開發(fa)研制(zhi)的(de)(de)應(ying)用(yong)GPS北斗技術授(shou)(shou)(shou)時(shi)(shi)(shi)(shi)(shi)(shi)的(de)(de)標準時(shi)(shi)(shi)(shi)(shi)(shi)間顯(xian)示和(he)發(fa)送的(de)(de)裝(zhuang)(zhuang)(zhuang)置，該(gai)裝(zhuang)(zhuang)(zhuang)置以(yi)GPS北斗為時(shi)(shi)(shi)(shi)(shi)(shi)間基準，可以(yi)同時(shi)(shi)(shi)(shi)(shi)(shi)視場范圍(wei)內(nei)24顆衛(wei)星(xing)，對(dui)時(shi)(shi)(shi)(shi)(shi)(shi)精度達20nS。GPS授(shou)(shou)(shou)時(shi)(shi)(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置采用(yong)SMT表面貼裝(zhuang)(zhuang)(zhuang)技術生(sheng)(sheng)產(chan)，以(yi)高速芯片進(jin)行(xing)(xing)控(kong)制(zhi)，無(wu)硬(ying)盤(pan)和(he)風(feng)扇設計，精度高、穩定性(xing)好、功(gong)能強、無(wu)積累誤差(cha)、不(bu)受(shou)地域(yu)氣(qi)候等環境(jing)條(tiao)件限(xian)制(zhi)、性(xing)價比高、操作簡單、全(quan)自(zi)動智(zhi)能化運行(xing)(xing)，免操作維護，適(shi)(shi)合無(wu)人值守(shou)。GPS授(shou)(shou)(shou)時(shi)(shi)(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置有標準RS232、RS422/485、脈沖、IRIG-B、DCF77、NTP/SNTP、IEEE1588協議(yi)網絡對(dui)時(shi)(shi)(shi)(shi)(shi)(shi)等接(jie)口形式(shi)，可以(yi)適(shi)(shi)應(ying)各種不(bu)同設備的(de)(de)對(dui)時(shi)(shi)(shi)(shi)(shi)(shi)需要，廣(guang)泛應(ying)用(yong)于電(dian)力(li)(li)、金融、通(tong)信、交(jiao)通(tong)、廣(guang)電(dian)、安防、石(shi)化、冶金、水利、、醫療(liao)、教育、機關、IT等領域(yu)。銳呈(cheng)電(dian)氣(qi)是一(yi)家(jia)致力(li)(li)于北斗衛(wei)星(xing)同步時(shi)(shi)(shi)(shi)(shi)(shi)鐘(zhong),GPS同步時(shi)(shi)(shi)(shi)(shi)(shi)鐘(zhong),NTP時(shi)(shi)(shi)(shi)(shi)(shi)鐘(zhong)服(fu)(fu)務(wu)(wu)器(qi)(qi),時(shi)(shi)(shi)(shi)(shi)(shi)間同步服(fu)(fu)務(wu)(wu)器(qi)(qi),網絡授(shou)(shou)(shou)時(shi)(shi)(shi)(shi)(shi)(shi)服(fu)(fu)務(wu)(wu)器(qi)(qi),GPS對(dui)時(shi)(shi)(shi)(shi)(shi)(shi)裝(zhuang)(zhuang)(zhuang)置,GPS校(xiao)時(shi)(shi)(shi)(shi)(shi)(shi)服(fu)(fu)務(wu)(wu)器(qi)(qi),GPS北斗雙模時(shi)(shi)(shi)(shi)(shi)(shi)鐘(zhong)系統(tong)(tong),子母(mu)鐘(zhong)系統(tong)(tong)的(de)(de)研發(fa)、生(sheng)(sheng)產(chan)和(he)銷售的(de)(de)企業。NTP授(shou)(shou)(shou)時(shi)(shi)(shi)(shi)(shi)(shi)服(fu)(fu)務(wu)(wu)器(qi)(qi)守(shou)時(shi)(shi)(shi)(shi)(shi)(shi)精度高。裝(zhuang)(zhuang)(zhuang)置內(nei)部守(shou)時(shi)(shi)(shi)(shi)(shi)(shi)單元(yuan)采用(yong)了(le)先進(jin)的(de)(de)時(shi)(shi)(shi)(shi)(shi)(shi)間頻率測控(kong)技術與智(zhi)能馴服(fu)(fu)算法。

上(shang)海銳呈電氣(qi)有限公司是一家致力于北(bei)斗衛星同(tong)步(bu)時(shi)(shi)(shi)(shi)鐘(zhong),GPS同(tong)步(bu)時(shi)(shi)(shi)(shi)鐘(zhong),NTP時(shi)(shi)(shi)(shi)鐘(zhong)服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi),時(shi)(shi)(shi)(shi)間(jian)同(tong)步(bu)服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi),網絡(luo)授時(shi)(shi)(shi)(shi)服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi),GPS對(dui)時(shi)(shi)(shi)(shi)裝(zhuang)置(zhi),GPS校時(shi)(shi)(shi)(shi)服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi),GPS北(bei)斗雙模(mo)(mo)時(shi)(shi)(shi)(shi)鐘(zhong)系(xi)統,子母鐘(zhong)系(xi)統的(de)研發、生(sheng)產和(he)銷售的(de)企業(ye)。廣(guang)(guang)播(bo)模(mo)(mo)式(shi)(shi)需(xu)要(yao)GPS服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi)端(duan)(duan)(duan)和(he)客戶(hu)端(duan)(duan)(duan)都(dou)配置(zhi)相(xiang)關(guan)命(ming)令。廣(guang)(guang)播(bo)模(mo)(mo)式(shi)(shi)的(de)工作過程(cheng)(cheng)如下。1）服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi)端(duan)(duan)(duan)發送時(shi)(shi)(shi)(shi)鐘(zhong)同(tong)步(bu)請(qing)求報文。2）服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi)端(duan)(duan)(duan)周期性地向廣(guang)(guang)播(bo)目的(de)地址。3）客戶(hu)端(duan)(duan)(duan)偵聽(ting)廣(guang)(guang)播(bo)消(xiao)(xiao)息包(bao)(bao)并同(tong)步(bu)時(shi)(shi)(shi)(shi)鐘(zhong)。4）客戶(hu)端(duan)(duan)(duan)偵聽(ting)來(lai)自(zi)服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi)的(de)廣(guang)(guang)播(bo)消(xiao)(xiao)息包(bao)(bao)。當接收到個廣(guang)(guang)播(bo)消(xiao)(xiao)息包(bao)(bao)后(hou)，客戶(hu)端(duan)(duan)(duan)為了估計(ji)網絡(luo)延遲先啟(qi)用一個短暫的(de)服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi)/客戶(hu)端(duan)(duan)(duan)模(mo)(mo)式(shi)(shi)與遠程(cheng)(cheng)服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi)交換消(xiao)(xiao)息，然后(hou)進(jin)入(ru)廣(guang)(guang)播(bo)客戶(hu)模(mo)(mo)式(shi)(shi)，繼續偵聽(ting)廣(guang)(guang)播(bo)消(xiao)(xiao)息包(bao)(bao)的(de)到來(lai)，根據到來(lai)的(de)廣(guang)(guang)播(bo)消(xiao)(xiao)息包(bao)(bao)對(dui)本地時(shi)(shi)(shi)(shi)鐘(zhong)進(jin)行(xing)同(tong)步(bu)。組播(bo)模(mo)(mo)式(shi)(shi)組播(bo)模(mo)(mo)式(shi)(shi)需(xu)要(yao)服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi)端(duan)(duan)(duan)和(he)客戶(hu)端(duan)(duan)(duan)都(dou)配置(zhi)相(xiang)關(guan)命(ming)令。NTP授時(shi)(shi)(shi)(shi)服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi)采用GPS/BD2雙系(xi)統精密授時(shi)(shi)(shi)(shi)。網絡(luo)時(shi)(shi)(shi)(shi)鐘(zhong)同(tong)步(bu)服(fu)(fu)務(wu)(wu)(wu)(wu)(wu)(wu)(wu)器(qi)(qi)(qi)(qi)(qi)

NTP授時(shi)服(fu)務器(qi)(qi)適用于收星效果(guo)不佳的(de)情況。網絡(luo)時(shi)鐘同步(bu)服(fu)務器(qi)(qi)

銳(rui)呈網(wang)絡(luo)(luo)時(shi)間(jian)安(an)(an)全(NTS)網(wang)絡(luo)(luo)時(shi)間(jian)安(an)(an)全(NTS)是(shi)(shi)Internet工(gong)程任務(wu)組的(de)NTP工(gong)作(zuo)組嘗試將NTP身份驗證(zheng)(zheng)更改為更有用(yong)(yong)的(de)東西。NTS實際上是(shi)(shi)兩種(zhong)協(xie)議：密(mi)鑰(yao)交(jiao)(jiao)換(huan)和(he)擴(kuo)展(zhan)NTP。首先，客(ke)(ke)戶(hu)端發起(qi)密(mi)鑰(yao)交(jiao)(jiao)換(huan)。在(zai)此交(jiao)(jiao)換(huan)中(zhong)，它(ta)會獲得(de)一些(xie)密(mi)鑰(yao)和(he)一些(xie)稍后(hou)(hou)(hou)使用(yong)(yong)的(de)cookie。cookie以(yi)只有服(fu)(fu)務(wu)器(qi)知(zhi)道的(de)形式包(bao)含密(mi)鑰(yao)。客(ke)(ke)戶(hu)端還獲取(qu)有關要查詢(xun)(xun)(xun)時(shi)間(jian)的(de)服(fu)(fu)務(wu)器(qi)的(de)信息。接下來(lai)，客(ke)(ke)戶(hu)端向服(fu)(fu)務(wu)器(qi)查詢(xun)(xun)(xun)時(shi)間(jian)。它(ta)使用(yong)(yong)其中(zhong)一個密(mi)鑰(yao)對其查詢(xun)(xun)(xun)進行(xing)(xing)簽名，并包(bao)括它(ta)從密(mi)鑰(yao)交(jiao)(jiao)換(huan)中(zhong)獲得(de)的(de)一個cookie。服(fu)(fu)務(wu)器(qi)知(zhi)道如何解壓(ya)cookie，然(ran)后(hou)(hou)(hou)使用(yong)(yong)里面的(de)密(mi)鑰(yao)來(lai)驗證(zheng)(zheng)查詢(xun)(xun)(xun)的(de)簽名并對響(xiang)應進行(xing)(xing)簽名。它(ta)還可以(yi)生成(cheng)并發送(song)一個新(xin)的(de)cookie以(yi)及時(shi)間(jian)響(xiang)應。客(ke)(ke)戶(hu)端驗證(zheng)(zheng)傳入數(shu)據包(bao)上的(de)簽名，然(ran)后(hou)(hou)(hou)可以(yi)設置時(shi)間(jian)，知(zhi)道它(ta)是(shi)(shi)從正(zheng)(zheng)確的(de)服(fu)(fu)務(wu)器(qi)發送(song)的(de)。它(ta)存儲新(xin)的(de)cookie以(yi)供以(yi)后(hou)(hou)(hou)使用(yong)(yong)。關于cookie處理(li)的(de)真正(zheng)(zheng)巧妙之處在(zai)于NTS服(fu)(fu)務(wu)器(qi)不(bu)必保存有關客(ke)(ke)戶(hu)端的(de)任何狀(zhuang)態。網(wang)絡(luo)(luo)時(shi)鐘同步服(fu)(fu)務(wu)器(qi)

上(shang)海(hai)銳呈(cheng)電氣有限公司(si)是(shi)我國GPS北斗同步時(shi)(shi)鐘(zhong)，NTP時(shi)(shi)間服務器(qi)，GPS校時(shi)(shi)器(qi)，北斗授時(shi)(shi)系統專業化較早的(de)私(si)營有限責(ze)任(ren)公司(si)之一，公司(si)成立于2007-04-18，旗下銳呈(cheng)，已(yi)經具有一定的(de)業內水平。銳呈(cheng)電氣致力(li)于構建(jian)安全、防護(hu)自主創新的(de)競爭力(li)，將憑借高精尖的(de)系列產品與解決(jue)方案(an)，加(jia)速推進全國安全、防護(hu)產品競爭力(li)的(de)發(fa)展。

本(ben)文(wen)來自宜興市恒(heng)通風機(ji)有限公司：//vijoo.com.cn/Article/30a70999260.html