A Activity diagram used in UML 6/9 and SysML B Bachman diagram Booch used in software engineering Block diagram Block Definition Diagram BDD used in SysML C Carroll diagram Cartogram Catalytic cycle Chemical equation Curly arrow diagram Category theory diagrams Cause-and-effect diagram Chord diagram Circuit diagram Class diagram from UML 1/9 Collaboration diagram from UML 2.0 Communication diagram from UML 2.0 Commutative diagram Comparison diagram Component diagram from UML 3/9 Composite structure diagram from UML 2.0 Concept map Constellation diagram Context diagram Control flow diagram Contour diagram Cordier diagram Cross functional flowchart D Data model diagram Data flow diagram Data structure diagram Dendrogram Dependency diagram Deployment diagram from UML 9/9 Dot and cross diagram Double bubble map used in education Drakon-chart E Entity-Relationship diagram ERD Event-driven process chain Euler diagram Eye diagram a diagram of a received telecommunications signal Express-G Extended Functional Flow Block Diagram EFFBD F Family tree Feynman diagram Flow chart Flow process chart Flow diagram Fusion diagram Free body diagram G Gantt chart shows the timing of tasks or activities used in project management Grotrian diagram Goodman diagram shows the fatigue data example: for a wind turbine blades H Hasse diagram HIPO diagram I Internal Block Diagram IBD used in SysML IDEF0 IDEF1 entity relations Interaction overview diagram from UML Ishikawa diagram J Jackson diagram K Karnaugh map Kinematic diagram L Ladder diagram Line of balance Link grammar diagram M Martin ERD Message Sequence Chart Mind map used for learning, brainstorming, memory, visual thinking and problem solving Minkowski spacetime diagram Molecular orbital diagram N N2 Nassi Shneiderman diagram or structogram a representation for structured programming Nomogram Network diagram O Object diagram from UML 2/9 Organigram Onion diagram also known as "stacked Venn diagram" P Package diagram from UML 4/9 and SysML Parametric diagram from SysML PERT Petri net shows the structure of a distributed system as a directed bipartite graph with annotations Phylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas information Plant Diagram Pressure volume diagram used to analyse engines Pourbaix diagram Process flow diagram or PFD used in chemical engineering Program structure diagram R Radar chart Radial Diagram Requirement Diagram Used in SysML Rich Picture R-diagram Routing diagram S Sankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network. Sentence diagram represents the grammatical structure of a natural language sentence. Sequence diagram from UML 8/9 and SysML SDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science. Smith chart Spider chart Spray diagram SSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphere State diagram are used for state machines in software engineering from UML 7/9 Swim lane Syntax diagram used in software engineering to represent a context-free grammar Systems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biology System context diagram System structure Systematic layout planning T Timing Diagram: Digital Timing Diagram Timing Diagram: UML 2.0 TQM Diagram Treemap U UML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysML V Value Stream Mapping Venn diagram Voronoi diagram W Warnier-Orr Williot diagram Y Yourdon-Coad see Edward Yourdon, used in software engineering
GPS是Global Positioning System（全球定位系统）的简称，一般指美国GPS系统。国际上投入运行且具备全球定位能力的系统还有俄罗斯的格罗纳斯（GLONASS）和中国的北斗卫星导航定位系统，正在建设中的有欧盟伽利略（GALILEO）定位系统，这些全球卫星定位系统在系统组成和定位原理方面基本一致，可以统 ...
希望不要冲突，要合作。 最后回答正题：北斗比GPS差的可能主要是市场（GPS已占80%）、全球监测站测卫星轨道（不友好国家不准设站）、黄金频率被占用，留给北斗的只有边角料频段。 但是这些困难都不是自身因素，只能笑着面对。 艰难困苦，玉汝于成。
在手机发布的时候我们可以看到，宣传他们支持「双频GPS」，「四频北斗」，但有的手机只有单频GPS，双频北斗，这个数量的多少就是导致手机导航定位不准的的罪魁祸首！ 下图为vivo X200手机支持的卫星及频段。
在上述四种全球导航系统中，GPS 是历史最悠久的系统，于 1994 年起提供全球定位服务。 GPS 系统也在不断的升级和更新中，来提供更多的信号和更精准的定位服务。 2012 年，该系统的 Block IIF 卫星正式投入使用，Block III 卫星也在规划中。
GPS 系统中，卫星的轨道高度为 20,200 千米，每天围绕 地球运行两周。 GPS 的卫星轨道设计使得在任意时刻、地球上任意位置，可见卫星不少于 6 颗，最多可以看到 15 颗卫星。 GPS 信号 GPS 卫星传输的信号主要由三个部分组成： — 载波 — 测距码 (伪随机码 ...
除了GPS以外，著名的GNSS还有俄罗斯的GLONASS [插图]。 GLONASS的起源能够追溯到苏联时代。 跟美军开发GPS的目的一样，当时的苏联政府对GLONASS的定位是：用于导弹制导等方面的具有高精确度的位置测定系统。 苏联政府就是基于此定位逐步整顿GLONASS的。
美国GPS卫星信号以伪随机码扩频的形式广播给用户。 卫星载波信号工作在L波段，为了校正电离层折射引入的附加传播时延，系统采用双频制，分别为L1和L2。 L1中心频率为1575.42MHz，L2中心频率为1227.60MHz。
GPS的原理是：天空上多个卫星同时发送信号，地面的接收装置与各卫星的距离不一样，到达的时间当然就不一样，利用时间差来计算出接收机的经纬度。 例如：你的左边和右边各有一个人，他们同时向你发出声音，左边的是1秒钟听到，右边的是2秒钟听到，也就是说左边的人距离你340米，而右边的人 ...
再说了，全球定位的卫星，非常高，GPS典型的卫星高达2万公里，远超地球直径。 同一颗卫星，可能服务半个中国，别的地方都正常，唯独你南京这旮旯有问题？ 所以，排除卫星。 二，然后，南京市所有终端都一起坏啦？ 然后一起好啦？ 要知道其他地方的都是 ...
常用的有Klobuchar模型（GPS卫星）、BDGIM模型（北斗 3系统）、NeQuick模型（伽利略系统）。 GPS、北斗和伽利略卫星系统都会在导航电文中播发各自的电离层模型参数，地面的GNSS接收机收到导航电文之后，从电文中获取模型参数，就可以对电离层模型进行估算了。
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