C.GPS 时间测量值(续1)

UTC(NTSC)一GPS TIME么犯2年2月 日词D 1 52306 2 523的 3 52308 45纷09 5 52310f 13UTPRN 14Ds UTf 15Ur班四17 PRN 18ns Ur Da UTPRN20DaU41(1942)39(1938)47(19M)51(1930)61(1926)47(1630)40(1626)50(1622)50(1618)56(1614)39(1又2)41(1538)41(15抖)45(1530)55(1526)37(1702)40(1“8)36(1654)39(1650)45(1646)042038叹03002620 29 32 3741523115231252313523145231541(1022)39(1018)44(1014)科(1010)41(1006)46(1918)43(1914)44(1910)37(1906)34(1902)36(1858)32(18又)21(1850)27(1以6)46(1602)47(1558)47(1554)努(1514)3…     

GPS时间测量值

2007年5月PRN01PRN02PRN03PRN04PRN05PRN06日MJD ns UT ns UT ns UT ns UT ns UT ns UT1542211(1142)-6(0346)-9(1334)2(2118)-2(0814)2(1230)254222-5(1138)-5(0342)4(1330)1(2114)-1(0810)2(1226)3542233(1134)-5(0338)5(1326)1(2110)-1(0806)-1(1222)4542246(1130)-6(0334)5(1322)1(2106)-1(0802)1(1218)5542253(1126)-6(0330)5(1318)3(2102)1(0758)4(1214)654226-1(1122)-6(0326)5(1314)1(2058)0(0754)3(1210)7542270(1118)-2(0322)16(1310)3(2054)1(0750)3(1206)8542284(1114)3(0318)17(1306)3(2050)5(0746)5(1202)95422…     

C.GPS时间测量值(续2)

UTC(CSAO)一GPS TIME2000年9月 日MTDPRN 21nsU,rPRN 23朋UTPRN汉朋UTPRN于27UrPRN 29仙UT517885178951790517915179259(0642)58(0638)52(06努)43(0630)68(0626)41(0435)61(0206)62(似似)86(01阳)29(0154)刀(0150)PRN 25朋Ur65(0918)49(0914)50(0910)42(0906)60(0902)67(1558)48(1554)45(1550)34(1546)51(1543)55(0658)51(0654)44(0650)50(0646)61(0翻3)八J月,咤口51793517945179551796517盯71(0622)74(0618)55(0614)44(0610)43(06()6)68(0146)74(0142)43(0858)59(0854)56(08如)材(0846)42(0翻2)58(1538)59(1534)63(1530…     

C.GPS 时间测量值(续2)

UTC(CSAO)一GPS TIME1999年5月 日MJDPRN 18料5 UTPRN 19拌5 UTPRN 24拼5 UTPRN 25科5 UTPRN 27拌5 UTPRN 29拌5 UT129913001301130213030.727(2302)0.648(2350)0.725(1134)0.691(2230)0.668(0146)0.650(1622)0.752(2258)0.736(2346)0.771(1130)0.677(2226)0.737(0142)0.686(1618)0.724(2254)0.689(2342)0.755(1126)0.712(2222)0.739(0138)0.627(1614)0.683(2250)0.750(2338)0.629(1122)0.744(2218)0.733(0134)0.751(1610)0.689(2246)0.720(2334)0.651(1118)0.648(2214)0.749(0130)0.752(1606)夕﹄no‘任眨口13041305130…     

GPS时间测量值

UTC(CSAO)一GPS TIME1997年2月 日MJDPRN 01拌5 UTPRN 02拌5 UTPRN 03娜UTPRN 04拌5 UTPRN 05娜UTPRN 06拌5 UT048004810482048304840 .398(0414)0.412(0410)0 .403(0406)0.365(0402)0 .369(0358)0.403(0743)0.412(0738)一0.367(0730)一0.426(0726)0.426(1458)0.376(0222)一0.397(1450)0.452(0218)0.370(0514)0.479(1451)0.406(0214)0.379(0510)0.435(1442)0.407(0210)0.408(0506)0.384(1438)0.379(0206)0.405(0502)04850486048704880489一0.384(0202)0.349(0458)0.442(1429)0 .445(0343)0.447(1336)0.472(0710)0.458(03…     

C.GPS时间测量值

UTC(CSAO)一GPS TIME1995年4月 日MJDPRN 01片UTPRN 02声UTPRN 05拌5 UTPRN 12朴。UTPRN 14娜UTPRN 16娜UT980898099810981198120.414(2230)0.459(0930)0.375(1418)0.417(2006)0.364(1154)0.366(1610)0.530(2226)0.491(0926)0.367(1414)0.481(2002)0.373(1150)0.477(1606)0.512(2222)0.393(0922)0.427(1410)0.472(1958)0.548(1146)0.505(1602)0.558(2218)0.339(0918)0.407(1406)0.457(1954)0.474(1142)0.452(1558)0.433(2214)0.321(0914)一0.424(1950)0,367(1138)0。440(1554)1山少曰代J4981398149815981698170。499(22…     

GPS时间测量值(续2)

UTC(CSAO)一GPS TIME1997年l月 日MJDPRN 22拌5 UTPRN 24拼5 UTPRN 25料5 UTPRN 26娜UTPRN 27拌5 UTPRN 29娜UT044904500451045204530.431(0546)0.395(0506)0.366(0502)0.414(0458)0.429(2107)0.446(2059)0.314(0902)0,376(0126)一一 一一0.341(2222)一0.412(0818)0.423(0052)0.406(2218)0.361(0730)0.348(0814)0.407(0046)0.384(2214)0.346(0726)0.422(0810)0.503(0042)0.360(2210)0.412(0722)045404550456045704580.472(0454)一0.409(0806)0.493(0038)0.462(2206)0.425(0718)0.421(0450)一0.433(0802)0.405(0034)0.442…     

GPS时间测量值

UTC(NTSC)-GPSTIME2005年9月PRN01PRN02PRN03PRN04PRN05PRN06日MJDnsUTnsUTnsUTnsUTnsUTnsUT153614-38(0658)-28(2050)-27(0802)-22(1546)-31(0154)-30(1930)253615-25(0654)-28(2046)-26(0758)-25(1542)-23(0150)-39(1926)353616-44(0650)-31(2042)-38(0754)-28(1538)-18(0146)-36(1922)453617-32(0646)-32(2038)-25(0750)-32(1534)-24(0142)-35(1918)553618-35(0642)-31(2034)-24(0746)-27(1530)-19(0138)-35(1914)653619-36(0638)-30(2030)-32(0742)-28(1526)-38(0134)-33(1910)753620-34(0634)-34(2026)-38(0738)-31…     

C.GPS 时间测量值(续2)

UTC(仪汰0)一GPS TIME20(犯年7月 日入习DPRN 21朋UrPRN23力,UTPRN24ns tjrPRN25ns UTPRN灯Ds LTTPRN 29力日I了T517265172751728517295173072(1以6)67(1042)75(0852)76(O翻6)74(1030)61(0614)64(0610)65(O6(巧)61(0602)63(0558)63(1326)刀(13刀)66(1319)72(1314)75(1310)51(2(X刀)66(2003)92(1959)67(1954)75(1950)83(1102)72(1058)80(1054)80(1051)81(1046)月几2介J月兮咤口6 517317 517328 517339 517科10 5173560(1026)63(10刀)51(08刀)63(0554)42(0550)53(0546)33(0542)75(0538)61(1306)54(1303)52(1258)53(1254)67(…     

CNO燃烧核反应的研究

本文利用势垒穿透模型计算重离子融合反应截面,我们发现理论计算结果同现有的实验数据符合得相当好。在此基础上,对~(12)C+~(12)C,~(12)C+~(14)N,~(12)C+~(16)O,~(14)N+~(14)N,~(14)N+~(16)O和~(16)O+~(16)O六种融合反应,在T_9=-0.1—5.0温度范内数值计算了这些热核反应率,并给出了它们随温度变化的近似解析表达式.对~(12)C+~(12)C,~(12)C+~(16)O和~(16)O+~(16)O这三种热核反应率,我们的新结果明显地低于Caughlan等人在1985年的列表值,特别是~(16)O+~(16)O的热核反应率比文[21中值低7—20倍,这将对整个大质量恒星的演化、超新星爆发以及核合成带来较大的影响,本文简略地讨论了这些影响.     

嵌入式GPS/DR车载组合导航系统EKF算法软件设计

介绍一种嵌入式GPS／DR（全球定位系统／航位推算）车载组合导航（它通过GPS与DR的优势互补,提高了车辆导航系统定位数据的可靠性）的EKF（扩展卡尔曼滤波）算法软件设计方法。采用统计学原理剔除导航数据的粗差点,用扩展卡尔曼滤波进行导航参数的实时求解,采用EKF算法的GPS／DR组合导航系统有利于导航信息的稳定性、可靠性和实时性。     

Dynamic planning of navigation determinations of airspace and missile objects in an automated flight test control system

This study considers an approach to planning navigation determinations of airspace and missile objects in the course of preparing for and carrying out an active flight test in an automated flight test control system. The approach is based on special information and mathematical software. The performance indices of the navigation determination subsystem are studied. Results of simulated modeling are provided.     

Communication-based positioning systems:past,present and prospects

This paper reviews positioning systems in the context of communication systems.First,the basic positioning technique is described for location based service(LBS) in mobile communication systems.Then the high integrity global positioning system(iGPS) is introduced in terms of aspects of what it is and how the low Earth orbit(LEO) Iridium telecommunication satellites enhance the global positioning system(GPS).Emphasis is on the Chinese Area Positioning System(CAPS) which is mainly based on commercial geostationary(GEO) communication satellites,including decommissioned GEO and inclined geosynchronous communication satellites.Characterized by its low cost,high flexibility,wide-area coverage and ample frequency resources,a distinctive feature of CAPS is that its navigation messages are generated on the ground,then uploaded to and forwarded by the communication satellites.Fundamental principles and key technologies applied in the construction of CAPS are presented in detail from the CAPS validation phase to its experimental system setup.A prospective view of CAPS has concluded it to be a seamless,high accuracy,large capacity navigation and communication system which can be achieved by expanding it world wide and enhancing it with LEO satellites and mobile base stations.Hence,this system is a potential candidate for the next generation of radio navigation after GPS.     

GPS接收机的中频信号处理算法研究

该文对GPS接收机的中频信号处理算法进行了研究,内容主要涉及信号捕获、载波恢复和伪码跟踪3部分,详细分析了信号捕获过程中所采用的匹配滤波器法、快速傅里叶算法(FFT)、锁频环(FLL)、锁相环(PLL)以及延迟锁定环(DLL)的算法原理,并对环路滤波器作了相应的阐述,给出环路对应的递推公式．     

CVN硬盘系统和软件相关处理在e-VLBI试验中的应用

介绍了中国VLBI网（CVN）的e-VLBI技术研究进展．CVN包括上海佘山、乌鲁木齐南山2个固定观测站和云南昆明的流动站，以及上海天文台的2台站硬件相关处理机。2003年上海天文台自行研制了基于PC技术的VLBI数据记录、回放系统，命名为CVN硬盘系统，并成功将其安置于CVN观测站和处理机系统。硬件处理机经过改造后，已能处理来自硬盘和原有磁带系统的数据．从2003年至今，中国VLBI网采用该硬盘系统进行了多次VLBI观测和e-VLBI试验。在CVN硬盘系统基础上，软件相关处理技术的研究也得以开展。软件相关处理原型程序已经被用于台站条纹检测、卫星条纹搜索和数据处理中。该软件获得的计算结果被成功用于国内第一个3台站卫星VLBI的延迟和延迟率闭合试验，以及国内首次利用VLBI数据进行的卫星定轨试验。除此之外，该软件还用作硬件处理机的条纹引导器。为适应未来“嫦娥”月球探测工程，CVN将扩展成含有4个观测站和2个相关处理机（硬件、软件）的实时VLBI网。今后，e-VLBI将被应用于月球卫星导航以及测地和天体物理的VLBI观测。     

第一代北斗星座卫星对GALILEO卫星导航定位系统增强性能仿真

第一代北斗星座已经于2003年布置完毕，基本实现了中国本土及周边的导航定位功能。中国作为GALILEO卫星导航定位系统开发的重要参与者，研究北斗系统和GALILEO卫星导航定位系统的集成问题十分必要和迫切。本文，就第一代北斗星座对GALILEO卫星导航定位系统的增强性能进行分析，主要对PDOP指标进行了仿真。给出了国内典型城市的PDOP及其一天内的变化曲线。     

Status of Satellite Orbit Determination and Time Synchronization Technology for Global Navigation Satellite System

In the form of satellite ephemerides and clock parameters, the information of space datum and system time of one global navigation satellite system (GNSS) is transferred to users. With continuously updating of satellite payload such as high precision atomic clocks, monitoring and tracking techniques such as inter-satellite links, and data processing techniques, the accuracy and real-time performance of satellite ephemerides and clock products are steadily improved. Starting from December 27th, 2018, BeiDou Navigation System 3, or BDS-3 has been providing accurate and reliable basic positioning, navigation, and timing (PNT) services to users in the countries within the “one belt and one road”. This paper summarizes the challenges of precise orbit determination and time synchronization faced and specific solutions sought from the regional BDS-2 system to BDS-3 global system at the control segment. It is interesting to compare BDS with other GNSS systems in terms of technical characteristics. Finally, aiming at higher accuracy and more reliable PNT services, a road map of precise orbit determination and time synchronization technique for next generation navigation systems is discussed, which will lead to better and better global navigation satellite systems.     

导航卫星精密定轨与时间同步技术进展

全球卫星导航系统(Global Navigation Satellite System, GNSS)通过播发卫星钟差和精密轨道信息实现时间和空间基准信息向导航用户的传递.随着高精度原子钟等导航卫星载荷、星间链路等天基/地基监测手段以及数据处理方法等技术的不断更新,卫星轨道和钟差产品的精度和实时性也逐步提升. 2018年12月,北斗三号卫星导航系统正式开通,为"一带一路"国家提供实时高精度、高可靠的基本导航定位服务.综述了北斗导航系统从北斗二号区域系统到北斗三号全球系统精密定轨与时间同步处理面临的困难和挑战,针对上述问题,阐述了北斗运行控制系统的解决途径和实现指标.与GPS等其他GNSS系统进行比较,分析了不同导航系统技术特点.最后展望了精密定轨与时间同步技术未来的发展路线图,为更高精度的GNSS导航定位授时服务提供参考.     

Status of Satellite Orbit Determination and Time Synchronization Technology for Global Navigation Satellite Systems

In the form of satellite ephemerides and clock parameters, the space datum and system time information of one global navigation satellite system (GNSS) is transferred to users. With the continuous updating in the satellite payload such as the high-precision atomic clock, the monitoring and tracking technique such as the inter-satellite link, and in the data processing technique, the accuracy and real-time performance of the satellite ephemeris and clock error products are steadily improved. Starting from December 27th, 2018, the BeiDou Navigation System 3, or BDS-3, has provided the accurate and reliable basic positioning, navigation, and timing (PNT) service for the users in the countries within the “one belt and one road”. This paper has summarized the faced challenges of the precise orbit determination and time synchronization from the regional BDS-2 system to the BDS-3 global system, and the specific solutions at the control segment. In addition, this paper has compared the BDS with other GNSS systems in terms of technical characteristics. Finally, aiming at a higher accuracy and more reliable PNT service, the road map of precise orbit determination and time synchronization technique for the next generation navigation systems is discussed, which will provide a reference for developing the global navigation satellite systems with an even higher accuracy.     

GNSS系统时间偏差的确定及其对定位结果的影响

由于GNSS各个导航系统都有独立的系统时间,在GNSS多模导航定位中需要对各导航系统之间的系统时差进行处理。以GPS／GLONASS双模导航为例,讨论了系统时差的解决方法以及系统时差对定位结果的影响。实验结果表明,在多模导航定位中考虑系统时差可以有效地提高定位结果的准确性,改善定位结果的精度。