GPS信号模拟器实用方法
GPS信号仿真器校准方法
校准 规范 。我们在 参 照这些相关 校准规 范及 生产 其 电平会被放大 ，增加 １ Ｂ ０ 。既然 内部噪声主要 ｄ 厂家 的校准手册 的基 础上 ，摸索 行之有效 的校 准 由中放 的第 一级产 生 ，因而输 人衰减器 不影 响内
方 法 ，对 信 号仿 真 器 的主要 项 目：频 率 、电平 、 部 噪声 电平 ，但 输入衰 减器影 响混频器 的信号 电 调制 等参数进行校准 。 平 ，并降低了信 噪 比。
对 于 Ｇ Ｓ仿 真器通 常选 取 １５ ５４ Ｐ ７ ．２ＭＨｚ 和 １２． ｚ ７０ ２ ６ ＭＨ 两个 常用 的频率校准点 。
个 别仪器 仍 旧会 碰到信 号抖动 的情况 ，可 以 使用求平均值的功能来读得相对稳定的信号 。
２ ． 电平准确度校准 ２
通 过 以 上 方 法 ，可 以准 确 、 快 速 地 在 指 定 频 与测 试 合 成 频 率 类 似 ，为 了模 拟 地 面 收 到 率点上测得电平值 。 的 Ｇ Ｓ 信号 ，Ｇ Ｓ 真器 的最 大输 出电平一般 ２３ 数字调制参数校准 Ｐ 小 Ｐ 仿 －
工 业 出版 社 ，２ ０ ． ０ ６
常 ；反 之 ，Ｅ Ｍ 正 常 ，Ｒ ｏ 多 正 常。 因此 ，对 Ｖ ｈ大 ＱＳ Ｐ Ｋ调制而 言 ，Ｒ ｏ只是 反映调制 质量 的一个 侧 ｈ 面 ，仅 以 Ｒ ｏ 判 断 调制 是 否 正 常 是不 全 面 的。 ｈ来
［ 吴幼璋 ，赵海 宁 ，于汇东 ，等． ２ ］ 数字调制质量参数 的校准 和量值
溯源 北京： 计量学报 ，２ ｏ ，２ ３ ０ ５ ６（ ）：２ １２ ４ ７— ７．
如果 Ｒ ｏ ｈ 不与 Ｅ Ｍ及 星座 图相结合 ，往往 不能 比 Ｖ 较客 观地 、完 整地反 映 总 的调制 质 量 。在 Ｃ ＭＡ Ｄ 网络 的测量 中 ，普遍存在 Ｒ ｏ ｈ 合格而 Ｅ Ｍ不合格 Ｖ
GPS模拟器说明文档
1.1GPS模拟器a)高性能控制计算机；b)实时模拟空间GPS星座的运行；c)模拟GPS接收机的主要工作过程、计算过程、误差特性和接口特性（具体包括：模拟GPS接收机的主要误差，根据用户位置和GPS卫星进行GPS可见星判断和最佳定位星座选择，卫星位置计算和伪距、伪距率测量量的模拟，用户位置和速度的解算，用户位置、速度和时间的输出等）；d)提供辅助信息显示，人机界面友好；e)以RS232方式输出GPS模拟数据，RS232速率按标准即可。
RS232方式的数据格式以标准NMEAO183方式传输。
1.1.1GPS模拟器软件GPS模拟器软件系统主要由以下几大部分组成：a)星历数据库（长时间卫星观测数据文件、星历模块）；b)仿真用算法模块，模拟GPS接收机的主要工作过程、计算过程、误差特性和接口特性（具体包括：模拟GPS接收机的主要误差，根据用户位置和GPS 卫星进行GPS可见星判断和最佳定位星座选择，卫星位置计算和伪距、伪距率测量量的模拟，用户位置和速度的解算，用户位置、速度和时间的输出等）；c)输出格式，RS232，ARINC429通讯模块，PPS控制模块。
图1 GPS模拟器软件系统主界面图2 GPS模拟器软件结构图系统启动后，GPS模拟机接收主控计算机的命令，开始持续工作，工作时GPS模拟机的软件流程图如下图所示。
图3 GPS模拟机工作流程图4 GPS模拟器星历动态处理效果图1.1.2GPS模拟器软件的使用GPS模拟器软件部分包括429板卡的自检，星历动态处理与发送，路径星历文件的预处理及发送，各种数据的示波器显示等，各部分所实现的功能和具体使用方法见如下的详细介绍，下图为GPS模拟器主界面。
图5 GPS模拟器主界面1.1.2.1自检软件的使用方法和步骤GPS模拟器自检部分只有ARINC429通讯的自检，自检界面和操作与主控机ARINC429通讯自己完全一样，这里不再赘述，详情请查看主控机自检软件的使用方法和步骤部分。
gps坐标仪器使用方法
GPS坐标仪器使用方法简介GPS坐标仪器（GPS coordinate instrument）是一种用于测量和记录地理位置的设备，通过全球定位系统（GPS）技术获得精准的地理坐标信息。
它在土地测量、地理信息系统（GIS）、野外探险等领域有着广泛的应用。
本文将为您介绍GPS坐标仪器的使用方法，帮助您快速上手，准确获取目标位置的精确坐标。
步骤一：开启设备首先，将GPS坐标仪器从包装中取出，并确保电量充足。
通常，仪器上方会有一个电源按钮或开关，按下或切换开关，打开设备。
步骤二：找到卫星信号为了获得准确的地理坐标信息，GPS坐标仪器需要与卫星建立连接并获得信号。
一般情况下，需要在露天的空旷地区进行操作，避免遮挡物干扰信号接收。
打开设备后，通常会显示当前接收的卫星数量。
如果显示为0或很少的数量，可以将设备移动到独立的宽阔区域，以确保设备可以接收到更多的卫星信号。
步骤三：设置坐标模式在开始记录坐标之前，需要根据具体需要设置坐标模式。
大多数GPS坐标仪器提供多种坐标系统，如经纬度（WGS-84）、UTM、MGRS等。
经纬度坐标是最常用的坐标系统，也是用来在地图上标记位置最为普遍的方式。
通过设备的菜单或设置选项，选择所需的坐标系统。
如果您不确定需要使用哪种坐标系统，建议选择经纬度（WGS-84），它在大多数应用场景下都能满足需求。
步骤四：记录目标位置设备已经开启并接收到足够的卫星信号，坐标模式也已经设置好，现在我们可以准确记录目标位置的坐标了。
1.在设备上方通常会有一个记录按钮或触摸屏上的相应选项。
按下该按钮或选择相应选项进入记录模式。
2.设备将开始定位并显示当前位置坐标。
等待几秒钟，确保设备已经稳定获取到了准确的坐标。
3.按下记录按钮或选择相关选项，将当前位置的坐标保存下来。
某些仪器还可以提供添加备注或标签的功能，可以根据需要添加额外的信息。
4.重复以上步骤，记录更多目标位置的坐标。
步骤五：导出和共享坐标数据当您完成了所有需要记录的目标位置后，可以将记录下来的坐标数据导出到其他设备或软件进行进一步的处理或展示。
喷泉公司北斗GPS信号模拟器使用介绍
北斗GPS信号模拟器使用介绍InBufferSize和OutBufferSize 特点指定了为接纳和发送缓冲区分配的内存数量。
这两个值设置得越大，应用程序中可用的内存就越少。
但是，若是缓冲区太小，就要冒缓冲区溢出的危险，除非选用握手信号。
因为如今大多数计算机有更多的可用内存资源，缓冲区内存分配已不那么至关紧要了。
换言之，能够把缓冲区的值设得高一些而不影呼应用程序的功用。
14．Handshaking特点语法-MSComm1.Handshaking[=Value]。
∙效果-设置或回来硬件握手协议。
指的是PC与MODEM之间为了操控流速而约好的内部协议。
Value 值如下。
∙“0”-comNone没有握手协议，不思考流量操控。
“1”-comXOn/XOff，即在数据流中嵌入操控符来进行流量操控。
“2”-comRTS，即由信号线RTS主动进行流量操控。
“5”-comRTSXOnXOff，两者皆可。
GPS接收机可接收到可用于授时的准确至纳秒级的时间信息；用于预报未来几个月内卫星所处概略位置的预报星历；用于计算定位时所需卫星坐标的广播星历，精度为几米至几十米（各个卫星不同，随时变化）；以及GPS系统信息，如卫星状况等。
GPS接收机对码的量测就可得到卫星到接收机的距离，由于含有接收机卫星钟的误差及大气传播误差，故称为伪距。
对0A码测得的伪距称为UA码伪距，精度约为20米左右，对P码测得的伪距称为P码伪距，精度约为2米左右。
GPS接收机对收到的卫星信号，进行解码或采用其它技术，将调制在载波上的信息去掉后，就可以恢复载波。
严格而言，载波相位应被称为载波拍频相位，它是收到的受多普勒频移影响的卫星信号载波相位与接收机本机振荡产生信号相位之差。
一般在接收机钟确定的历元时刻量测，保持对卫星信号的跟踪，就可记录下相位的变化值，但开始观测时的接收机和卫星振荡器的相位初值是不知道的，起始历元的相位整数也是不知道的，即整周模糊度，只能在数据处理中作为参数解算。
数字中频GPS信号软件模拟器设计
Telecommunication Engineering
Vol. 47 No. l Feb. 2007
c（ 为 C / A 码 Gold 码序 p t 为发射信号的功率； i t） （ 为导航电文； T 为 GPS 列； D ! Ll 为 Ll 载波频率； i t） 系统时。 2! 2 天线端接收信号模型 在仿真建模中， 只考虑对接收机信号跟踪有可 测影响以及对接收机设计差异有严重影响的误差， 多数 GPS 误差源 （ 如电离层 / 对流层扰动、 卫星钟 差、 星历误差等） 可以被忽略。简化后的在接收机
［ l］ 天线端的 GPS 信号模型可表示为
｛ 2! （ f Ll - f LOl - f LO2 - f LO3 ） t r - 2! f Ll （ "t r + Td ） ｝ IF3 = cos
（5） f LO2 、 f LO3 分别为本振 LOl 、 LO2 、 LO3 其中， f LOl 、 的频率， t r 为接收机时间。IF3 可进一步写为 2 ! f IF3 t r - 2 ! f Ll （ "t r + T d ） ｝（ 6 ） IF3 = cos｛ 其中， f IF3 = f Ll - f LOl - f LO2 - f LO3 代表采样前的 中频。 2! 4 振荡器误差建模 接收机振荡器误差对信号的连贯跟踪有重要 影响， 是信号建模中主要考虑的硬件误差。设振荡 器标称频率为 f norm ， 误差为 "f， 则振荡器输出实际 频率为 f osc = f norm + "f。频率误差的噪声类型主要 包括频率随机游走、 频率闪烁噪声、 频率白噪声、 相 位闪烁噪声和相位白噪声。通常采用阿仑方差来 表征频率稳定度， 给定取样间隔为 l s， 则在以上各 噪声误差 项 中 只 考 虑 起 支 配 作 用 的 随 机 频 率 游
高动态gps卫星信号模拟器关键技术分析及应用
高动态gps卫星信号模拟器关键技术分析及应用高动态GPS卫星信号模拟器是用于模拟高速移动场景下的GPS（全球定位系统）信号的设备，可用于测试和验证GPS 接收机在高速移动条件下的性能。
在高速移动条件下，接收机面临着多个挑战，包括多径效应、信号衰减、非理想信道条件等，因此需要进行实际场景的模拟来评估接收机性能。
高动态G P S卫星信号模拟器的关键技术包括：1.高速动态运动模型：针对车辆、飞机等高速移动载体，需要准确建立运动模型，包括速度、加速度、转向等参数。
通过准确模拟运动轨迹，可以生成相应的G P S信号。
2.多卫星信号模拟：考虑到高速移动场景下接收机可能无法同时“看到”同一颗卫星的信号，需要模拟多颗卫星信号的接收情况。
需要准确模拟卫星的轨道、仰角等参数。
3.多径效应模拟：接收机在高速移动条件下容易受到多径效应的影响，即接收到的信号可能有多个路径到达，导致信号畸变、干扰等。
需要模拟不同路径间的时间延迟、幅度衰减等参数。
4.复杂信道模型：将实际场景中的信道特性模拟到G P S信号中，包括多径衰落、多普勒效应等。
需要准确建立信道模型，使得生成的G P S信号与实际信号在行为特性上一致。
高动态G P S卫星信号模拟器的应用主要体现在以下几个方面：1. G P S接收机性能验证：通过模拟高速移动场景、多路径效应等条件，可以对G P S接收机在高动态条件下的信号跟踪、定位性能进行验证和评估。
2.导航系统开发：对于高速列车、飞行器等移动装置，模拟其在不同速度下的G P S信号可以用于导航系统的开发和调试。
通过高速运动模型的模拟，可以评估导航算法的准确性和鲁棒性。
3.智能交通系统：在智能交通系统中，G P S 信号模拟器可以用于评估车辆导航设备的性能，并提供导航引导和交通管理服务。
4.车联网应用：在车联网应用中，G P S信号模拟器可以模拟车辆在高速移动条件下的位置信息，用于车辆定位、路径规划等应用。
总之，高动态G P S卫星信号模拟器在现代导航、交通与通信领域发挥着重要作用。
GpsSimul用户指南说明书
GpsSimul User GuideUser guideTable of ContentsGpsSimul User Guide (3)Welcome to GpsSimul (4)Licensing GpsSimul (5)GpsSimul License (5)Introduction (7)Prerequisites (7)Installing GpsSimul (8)Setting up GpsSimul (13)SetUp Panel (13)The User Interface (16)Navigate Panel (20)Sentences Panel (22)Trace Panel (23)GpsSimul User Guide © 2012, Sailsoft(****************)Welcome to GpsSimulGpsSimul is an attractive little Windows PC program providing the user of NMEA 0183 compatible hardware or software with a great demonstration and testing tool by simulating the NMEA 0183 output of any NMEA 0183 complient GPS.The program is also great for learning your new navigation equipment like Chart Plotters and Autopilots, without leaving the convenience of your home or workshop. You only need a serial PC COM port, either physical or virtual to connect to your application. USB-to-serial converters can also be successfully used in case you need to connect to external devices. The primary function of the program is to send valid NMEA 0183 GPS data out via a user configurable PC serial (COM) port. The simulated GPS data can then be easily picked up and processed by various navigation equipment or applications supporting the NMEA 0183 protocol. This allows very comfortable testing of your NMEA 0183 compatible equipment in your own environment without the need to go outside to catch a real GPS signal.Dynamic variables like altitude, course and velocity can be controlled with arrow marked buttons on the interface while the program is running and outputting data, so that a realistic moving GPS is simulated.All settings and the "current state" of the program are automatically saved upon exiting, so when you start the program again you can continue where you left off.Licensing GpsSimulGpsSimul LicenseLicenseGpsSimul is a proprietary product of Sailsoft. GpsSimul is no freeware. You have to purchase a license from Sailsoft to use the program legally. You will find directions on how to obtain a license for GpsSimul on the Sailsoft web site www.sailsoft.nl. You can download a free trial there also. The trial is fully functional, but the output of NMEA sentences is limited to a maximum number of sentences decided by Sailsoft. The trial will also remind you to purchase a license, each time you start the program. Below you will find the text of the License Agreement that will become valid after you have downloaded the program from the Sailsoft website or from any other source.SOFTWARE LICENSE AGREEMENTThis document is a legal agreement between you (an individual or business) and Sailsoft. Use of the software indicates your acceptance of these terms. As used in this License Agreement, the term ‘Software’ means the software you have obtained on any media including downloading of the Internet. This license agreement include both the trial version and the registered version. By using this software you agree with the terms in this agreement.I. PROPRIETARY RIGHTS. The Software and any accompanying documentation are the proprietary products of Sailsoft and are protected under national laws and international treaty provisions. Ownership of the Software and all copies, modifications, translations, and merged portions thereof shall at all times remain with Sailsoft.II. GRANT OF LICENSE and TERMINATION. The Software and accompanying documentation are being licensed to you, which means you have the right to use the Software only in accordance with this License Agreement. The Software is considered in use on a computer when it is loaded into temporary memory or installed into permanent memory.PERSONAL LICENSE. This license is personal to you. You may not sublicense, lease, sell, or otherwise transfer the Software or any of the accompanying documentation to any other person. You may use the Software only for your own personal use if you are an individual, or for your own internal business purposes if you are a business. COMPUTER-SPECIFIC LICENSE. Each permitted copy of the Software may be used only on ONE specific computer (either a stand-alone computer or a computer connected to a network) owned or leased by you. Once a copy of the Software has been installed on a computer, it may not be used on any other computer. If the Software is made available on a network, it may be accessed only by ONE specific computer. Once the Software has been accessed by ONE specific computer it may not be used on any additional computers without purchasing additional licenses. UPDATES AND SUPPORT. You are entitled to receive support for a period of 60 days from the day you received your license from Sailsoft. Support shall be limited to e-mail support from Sailsoft’s office, unless Sailsoft specifically agrees otherwise. You are entitled to receive Software updates in accordance with Sailsoft policies. Software updates will be announced on Sailsoft’s website. Support and software updates are not by definition free of charge, however, if there is a fee to be charged Sailsoft will notify you on beforehand.TERMINATION. This license is effective from your date of obtaining your license and shall remain in force until terminated. You may terminate the license and this License Agreement at any time by destroying the Software and the accompanying documentation, together with all copies in any form.III. BACKUP COPY. A maximum of 3 copies of the Software may be created for archival or backup purposes.IV. NONPERMITTED USES. Without the express prior written permission of Sailsoft, you may not (a) use, copy, modify, alter or transfer, electronically or otherwise, the Software or documentation except as expressly permitted in this License Agreement, or (b) translate, reverse program, disassemble, decompile, or otherwise reverse engineer the Software.V. DISCLAIMER. The Product is not fault-tolerant and is not designed, manufactured or intended for use in environments requiring fail-safe performance, such as in the operation of nuclear facilities, vessel and aircraftnavigation or communication systems, traffic control, direct life support machines or weapons systems, in which the failure of the Product could lead directly to death, personal injury, or severe physical or environmental damage. Accordingly, Sailsoft specifically disclaim any express or implied warranty of fitness for High Risk Activities. Licensee agrees that Sailsoft will not be liable for any claims or damages arising from the use of the Product in such applications.Registering your licenseLicense codesAfter starting GpsSimul in trial mode a screen is shown where you can fill in your license codes as you have received these from Sailsoft. Once you have entered valid license codes this window will not be shown anymore.If you have not purchased a license for the program yet, you can run it in trial mode as many times you want. But every time you start the program you will see the nag screen to remind you that you are still in trial mode.In trial mode only 100 NMEA 0183 sentences are output per run.The image below shows how to enter your license codes.IntroductionPrerequisitesBefore installing GpsSimulBefore you install GpsSimul, please make sure you have:∙Windows 2000, XP, Windows7 or Vista∙At least 512 MB RAM, the more the better∙100 MB free disk space∙At least 800*600 screen solution, larger is better∙One or more serial ports, either physical, virtual or via USB to serial adapter GpsSimul is currently written based on the Microsoft .Net 2.0 Framework*. The .Net Framework comes standard with XP SP2, Vista and Windows 7, and is probably already installed on your computer if you have regularly installed the Microsoft updates. Chances are that you will have a higher version than 2.0 on your Windows computer. This is OK since higher versions will always be downwards compatible with 2.0. If the installer can not find the .Net Framework 2.0 or higher on your system, the installation program will install the.Net 2.0 Framework automatically before GpsSimul is installed. The installation time will be considerabel longer in this case.You are of course free to install the .Net 2.0 Framework (or a higher version) yourself before you install GpsSimul. The Microsoft .Net 2.0 Framework can be downloaded directly from Microsoft here.After installation we strongly advise to open the Settings window by clicking the SetUp button and adjust the settings to your preferences. See SetUp window*) Sailsoft may change the version of the .Net Framework to a higher version without explicit notice.Installing GpsSimulGpsSimul is delivered as a Windows Installer file (msi). In most cases you will have downloaded this file from the Sailsoft website. If you have obtained the file from somewhere else, do not install it. Instead download the file from our website. This will ascertain you have the latest version of the program, and that it is clean of any possible malware.When you run the file - either directly at download or after saving and double-clicking on it - the GpsSimul Setup Wizard will start and lead you through a few simple setup steps.Step 1) You need to agree with the licence terms, otherwise the program will not install. Make sure you've read them carefully before continuing.Step 2) You have the option of changing the install directory. It is recommended that you accept the proposed directory. In 64-bit Windows7 and Vista GpsSimul will be installed per default in C:\Program Files (x86)Step 3) Installation progress is shown.Step 4) After closing the screen below, GpsSimul is ready to run and can be started from the desktop icon or the Windows Start menu.Setting up GpsSimulSetUp PanelBefore you can use GpsSimul you must at least configure the communication port you want to use. You do this in the SetUp window as shown below.When GpsSimul starts, it tries to detect all serial ports available in your system. All ports that it finds are collected in a drop-down selection control.GpsSimul remembers the port you use, and tries to open it next time you start the program. If you have made any changes in your COM port configurations, e.g. removed or added any serial ports, check if the selected port still is available otherwise GpsSimul may crash!Serial portYou can select the port you want to use here.When you open the drop-down box you will see all ports that have been found in this system.Just select the port you need.Baud rateSelect the baud rate to use.The lowest rate is 1200 baud, the highest is 256000 baud.Default is 4800, being the NMEA 0183 standard for GPS.Remark: the baud rate is the only serial port parameter you can set.GpsSimul sets the other port parameters as follows:Databits: 8Parity: NoneStopbits:1RTS/CTS handshaking is set to none.GPS accuracyparametersDilution Of Precision values, Geoidal Separation and number of satellites in view asused in GGA and GSA data.Note that these can dynamically be adjusted while the object is running!UTC Date, Time and OffsetUTC Date and Time as this appears in the appropriate NMEA data.This is the actual UTC time and can not be changed.Use the offset to get your local time.GPS co-ordinatesTo change the value of either Latitude or Longitude the GPS simulation must not berunning.To change: place the mouse cursor left of the leftmost digit. Then just start typingthe new latitude or longitude, the cursor will advance automatically and the value will be automatically formatted. Example: 53° 21.56' N must be entered as0532156000N.After clearing, the fields will look like this: " ___° __._____' _".Magnetic VariationHere you enter the Magnetic Variation for the RMC sentence.A negative value is Westerly variation, a positive value is Easterly.Fix qualityThe GPS fix quality for the GGA sentence.Default is DGPS.Speed UnitSet to your preference.Log file pathType or select the location where you want GpsSimul to store the log file when logging is enabled.A directory selection window will open when you click the little square box at the right.The User InterfaceYou can position the user interface anywhere on your desktop by dragging it with the mouse.Point the mouse cursor somewhere at the edges, hold down the left mouse button and start dragging.Release the mouse button when done.The user interface of GpsSimul can be divided in the following sections:1.The header at the top2.The main panel in the center3.The secondary panel below the main panel4.The arrow buttons at the left and right5.The toggle switches at the bottom6.The Close and Help buttons at the edgesYou can resize the height of the secondary panel by dragging the top edge of it,e.g. when you need more space for the trace.Application HeaderIn the header the version information is displayed and the name of the licensee. When no license codes have been found, the "Unlicensed Trial Version" text is shown.Main PanelThe main panel shows either the SetUp Panel or the Navigation Panel.You can switch between these Windows with the leftmost toggle switch at the bottom.Secondary PanelThis panel either shows the sentences you can select or the trace panel.The example above shows the sentences panel.Arrow buttonsWith the blue arrow buttons on both sides of the GUI you can 'navigate' with the simulator.These also work when the simulator is running.You can adjust course, speed and altitude with these buttons.Toggle switchesToggle between∙SetUp / Navigate panel∙Show Trace / Sentences panel∙Enable Logging / Disable Logging∙Start / StopClose ButtonClicking this will end the program.Navigate PanelThe navigate window is normally used during simulation runs.It is however possible to have the SetUp panel shown while running, but it is advised to pause the program while changing field values.CompassShow the current simulated course.Current PositionShows the current simulated position.Is automatically updated during a simulation run.The position is recalculated at every Xmit interval using the current course and speed.Current Course, Speed and AltitudeIndicates the current Course, Speed and Altitude.These values change by using the blue navigation arrows.Note that the altitude in feet is automatically re-caculated when the altitude in meters changes.Sentences PanelNMEA 0183 sentencesSelect the NMEA 0183 sentence(s) you want GpsSimul to output.ChecksumTick this box when a checksum should be calculatedand added at the end of each sentence.Transmit intervalUse the small up/down arrows to adjust the transmit interval time. NMEA 0183 standard is 1 second.Note that all selected sentences are transmitted within each interval.Trace PanelNMEA 0183 sentences generatedThis window shows a trace of the sentences as they are output.By clicking with the right mouse button in this window you get 3 options:1.-Select All (will select all sentences)2.-Copy (will copy selected sentences to the clipboard)3.-Clear (will clear the trace window)You need of course to pause the program before using these options.。
BD-2、GPS卫星导航信号模拟器功能指标及技术特点
卫星导航信号模拟器功能及技术特点北京华力创通科技股份有限公司导航事业部目录1概述 (2)2功能 (2)2.1 数学仿真分系统 (3)2.2 射频信号仿真分系统 (5)2.3 测试与评估分系统 (6)3技术特点 (6)3.1高精度信号延迟技术 (6)3.2高动态载波相位控制技术 (7)3.3载波/码相位同步技术 (8)3.4多路信号同步技术 (8)3.5 准实时卫星导航建模的时延固定技术 (8)1概述卫星导航系统中的接收设备利用导航卫星的导航信号进行定位，测速、定时以及信息传送。
接收终端设备的功能和性能指标的好坏，直接影响BD-2/GPS 系统的应用性能，因此必须对各种类型的接收终端设备进行全面的测试，以检验这些接收终端设备是否满足设计要求。
卫星导航信号模拟器用于对各类接收终端设备实现卫星不在轨、室内或临界条件下的测试，或指定条件下的重复测试。
卫星导航信号模拟器包括数学仿真分系统、射频信号仿真分系统和测试评估分系统三部分。
各分系统既相互独立，又可有机地结合在一起。
例如数学仿真分系统可以单独运行，为用户提供有关卫星运行模型，用户运动模型方面的信息，并可以图形方式显示卫星运行轨迹，但多数时候，各部分作为一个整体运行，由数学仿真分系统产生导航电文和观测数据，通过射频信号仿真分系统生成带有各类特征（延迟，多普勒，衰减等）的真实射频信号，发送到接收终端设备，再由测试评估分系统收集终端设备的相关数据，得到测试结果。
经过多年的研究发展，北京华力创通科技股份有限公司的卫星导航信号模拟器形成了一系列的产品，能够满足不同用户的需求。
各种产品具有功能及技术指标，祥见附录中对各种产品的介绍。
下面主要介绍北京华力创通科技股份有限公司的卫星导航信号模拟器通用功能和技术特点。
2功能卫星导航信号模拟器包括数学仿真分系统、射频信号仿真分系统和测试评估分系统三部分。
下面分别介绍各个分系统的功能。
2.1 数学仿真分系统数学仿真分系统是卫星导航信号模拟器的重要组成部分。
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GPS信号模拟器实用方法
1.1具体设计
所谓数据库维护模块就是对前面所建立的数据库中的4个表格内容进行操作。
完成对4种雷达信号的删除，增加，修改等功能。
由于每种雷达信号的编写方式类似。
这里主要介绍常规脉冲信号模块的编程方法。
1.1.1控件选择
控件清单：Command控件4个，frame控件2个，text控件2个（一个是text 数组），adodc控件一个，DataGrid控件一个。
1.1.2数据库显示
这里数据显示过程是用Datagride表格显示数据库中的常规脉冲信号。
我们这里用的连接数据库的控件是ADO Data.ADO Data控件属于ActiveX控件，使用以前必须将其添加到工具箱中[4]。
添加方法如下：
单击“工程“/“部件”菜单项，弹出“部件”对话框。
在“部件”对话框中选择“microsoft ADO Data Conctrol 6.0(OLE DB)”列表项，单击确定按钮，即可将ADO Data控件添加到工具箱中。
将鼠标移到工具箱中，将显示该控件的名称“Adodc”
双击工具箱中的ADO Data控件图标或单击ADO Data控件后在窗体上拖拽鼠标，即可将ADO Data控件加到窗体中。
然后再设置ADO Data控件连接Access数据库：
1.在窗体上面添加一个ADO Data控件以后，单击该控件，在右侧的属性列表中找到ConnectionString属性，单击【…】按钮，将弹出下图对话框。
2.在属性页对话框中选择“使用连接字符串“连接数据库
3.单击生成按钮，选择“Microsoft OLE DB Provider for ODBC Drivers“
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