导航电文

GPS新民用导航电文简约历书的算法和性能分析

The algorithm and performance analysis of the reduced almanac of GPS civil navigation message

关于GPSL5导航电文的编码特点研究

Encoding Characteristics of GPS L5 Navigation Message

GPS软件接收机导航电文提取的研究

Navigation Data Extraction Based on GPS Software Receiver

导航电文产生功能模块是高动态GPS卫星信号模拟器要解决的一项关键技术。

Producing functional module of navigation data is a key technique that the high dynamic GPS signal simulator must solve .

基于STK的高动态GPS卫星信号模拟器导航电文生成

Production of Navigation Message of High Dynamic GPS Signal Simulator Based on STK

在本文中，主要完成了以下工作：1、分析了GPS接收机在接收到GPS信号后解调出的导航电文中包含的各种信息。

Analysis of the GPS receiver in which the received signal to the GPS after the demodulated navigation message contains various information . 2 .

GPS用户利用导航电文中的历书数据进行卫星可见性的计算和预报。

The almanac data in GPS navigation message is used by the user of GPS to calculate and forecast the visibility of navigation satellites .

针对自主研发的GPS原理样机，对卫星在轨坐标解算、导航电文获取进行了阐述和研究。

By working on the self-developed prototype of GPS , the coordinates of the satellite in orbit calculation , navigation message access and research are described .

为了能使普通商用GPS接收机正确接收伪卫星信号并输出观测值，研究了伪卫星的导航电文构成与改进，实现了其设计方案。

The navigation message for pseudolite has been improved , because we want to get the measurements from an ordinary business receiver that received signal of pseudolites .

本篇文章主要是针对GPS数字信号的编码、导航电文的解析、以及硬件的实现进行的研究。

This article is mainly directed against the study which includes GPS digital signal coding , the analysis of navigation message , as well as the hardware implementation .

GLONASS导航电文介绍航行情报与飞行安全

Navigation message of GLONASS Information and Safety of Navigation

GLONASS导航电文介绍

Navigation message of GLONASS

利用GPS导航电文调制周期为20个C/A码周期的特性，将块叠加（BlockAddition）频域捕获的思想应用于GPS信号频域跟踪，从而大幅度节约计算量，为实时跟踪创造条件。

As the feature of a GPS data bit is 20 ms long and contains 20 C / A codes , block Addition acquisition method is used in tracking to reduce computational load and make preparations for tracking in real-time .

实现了对GPS信号的混频与积分转储，对数字信号的基带处理，最终正确解码导航电文，完成卫星和用户位置的定位，而且在上位机上实时显示结果。

This receiver could realize mixing , integration and dumping of GPS signal , base-band processing of digital signal , correctly decoding navigation message , positioning of satellites and user , and displaying the result in real time .

根据导航电文中的广播星历和IGS提供的精密星历对GPS共视比对结果中的几何时延误差进行了改正。

The geometric delay errors for GPS common view time comparison between remote clocks are corrected according to broadcasting ephemeris of navigation information and precise ephemeris that IGS provides .

闭环测试结果表明SNSS软件生成的伪距、载波相位和导航电文等数据能满足普通导航定位接收机的测试需要。

Closed-loop positioning test results indicate that the pseudo-range , carrier phase and navigation message generated by SNSS can meet the needs of general navigation receiver test .

本文总结了GPS现代化信号体制下，新增民码L2C、L5、L1C以及军码M码的特点以及新导航电文的变化。

This paper summarizes the character of new civil signals of L2C 、 L5 、 L1C and new military code M-code and the differences between the new and the old navigation data in the system of modernized GPS .

首先，在深入研究了导航电文帧结构的基础上，以ICD-GPS-200规范为依据，对导航电文中所包含的星历数据进行了解析，将所得数据作为求解卫星瞬时位置的依据。

Firstly , based on the study of the structure of Navigation message frame , according to ICD-GPS-200 norm , the ephemeris data in navigation message are interpreted and used as the foundation of solving the instantaneous location of satellite .

导航电文提取中最重要的步骤是位同步和帧同步。

The most important steps for navigation data extraction are bit synchronization and frame synchronization .

数字处理部分对各样本加以积累与处理，解调卫星的导航电文。

They are accumulated and processed in digital part and the navigation message is demodulated .

对导航电文的内容及结构进行讨论，给出合理的导航电文格式，降低了通信量；

Discussed navigation message 's content and structure , provided platform 's navigation message format , which can reduce the traffic .

系统主要包含目标运动轨迹计算、误差计算、导航电文生成及信号调制发射等功能模块。

The system comprises the target trajectory calculation module , the error calculation module , the satellite navigation parameters generation module , and the signal modulation module , etc.

根据辅助型接收机能从辅助网络获取导航电文的特点，提出了一种精简星历和卫星时钟参数辅助算法。

According to the feature that the AGPS ( Assisted GPS ) receiver can obtain navigation data from assisted network , a new algorithm for assisted Doppler is proposed .

轨道外推与坐标系转换贯穿于轨道改进和预报整个过程中，直接影响导航电文的精度，因此有必要针对轨道外推和坐标系转换对精密定轨及轨道预报的影响进行研究。

The navigation systems . Orbit extrapolation and reference frame conversion throughout the entire process of orbit determination and prediction , and is the direct impact on the results of precision .

第三章是关于导航电文的详细介绍，对于导航电文的研究是实现伪卫星的关键所在，因此需要细化到每一个比特加以说明。

Chapter III mainly introduces the navigation message in detail . For the implementation of the program , navigation message is the key to pseudolite . Therefore it is necessary to illustrate every one bit .

这样，整个平台就能实现对信号的粗捕获、码相位和频率的锁定跟踪，最终实现导航电文解码及用户位置定位。

Therefore , the whole platform could realize coarse acquisition , tracking of code phase and frequency , navigation message decoding and positioning of the user * The paper focuses on the design of the 12-channel digital correlator and baseband processing loop .

众所周知，GNSS接收机正常工作的前提是能稳定地跟踪上卫星信号，解调出导航定位所需的导航电文。

As known , the premise on which the GNSS receiver works normally is that it can track the satellite signal stably , demodulate the required navigation data information which is used for navigating and positioning .

地面站是卫星导航系统运行、控制的核心部分，主要完成卫星系统的导航电文注入、时间同步等任务，是导航系统运行的控制主体。

Ground station , which fulfills infusing navigation message and time synchronization and so on , is a key part and control center of satellite navigation system .

为了提高卫星导航系统的定位成功率，尤其是在特殊深衰落环境中的定位成功率，需要研究新的导航电文的发播结构和编码技术。

In order to enhance the robustness of navigation system , especially on deep fading channels , it is necessary to design applicable navigation message structure and to choose appropriate channel coding method .