This book is about global NAVigation satellite systems (GNSS), their two main instru-
ments, which are a receiver and a simulator, and their applications. The book is based on
an operational off-the-shelf real-time software GNSS receiver and off-the-shelf GNSS
signalsimulator.Theacademicversionsofthesetoolsarebundledwiththisbookandfree
for readers to use for study and research.
當(dāng)前全球定位系統(tǒng)（NAVigation Satellite Timing And Ranging Global Position System，簡(jiǎn)稱GPS）廣泛應(yīng)用于艦船導(dǎo)航，航空航天，地理測(cè)繪等領(lǐng)域，特別是移動(dòng)式定位系統(tǒng)對(duì)于目前的城市交通管理有著非常重要的意義。本文分析了當(dāng)前交通管理中的實(shí)際問(wèn)題，介紹了一種車載終端的設(shè)計(jì)方法。設(shè)計(jì)采用ARM9內(nèi)核的S3C2410微處理器構(gòu)造的嵌入式系統(tǒng)，可以實(shí)現(xiàn)對(duì)GPS定位信息的接受和處理，并采用嵌入式Linux操作系統(tǒng)，結(jié)合開放式Linux圖形軟件Qt，可以為后續(xù)的建立地理信息系統(tǒng)（Geographic information system，簡(jiǎn)稱GIS）提供數(shù)據(jù)支持，是集GPS全球衛(wèi)星定位系統(tǒng)和通用分組無(wú)線業(yè)務(wù)（General Packet Radio Service，簡(jiǎn)稱GPRS）無(wú)線通信技術(shù)于一體的新型電子產(chǎn)品。它為現(xiàn)代交通運(yùn)輸提供了新穎，可靠，有效的控制和管理途徑。 車載終端通過(guò)將GPS模塊的定位信息提取出來(lái)，一方面將定位信息在車載終端上顯示，一方面又結(jié)合車輛的狀態(tài)信息通過(guò)GPRS模塊發(fā)送出去，該信息通過(guò)無(wú)線公共網(wǎng)絡(luò)傳輸給車輛管理部門。車輛管理部門根據(jù)車輛的位置和狀態(tài)等，結(jié)合GIS系統(tǒng)中的地圖信息提供GPS數(shù)據(jù)的差分修正，并采取一定的措施，從而實(shí)現(xiàn)車輛的有效管理。 本設(shè)計(jì)從硬件和軟件兩大部分出發(fā)，硬件上設(shè)計(jì)了ARM處理器、存儲(chǔ)器、內(nèi)存及其外圍電路，另外還有GPS模塊電路和GPRS模塊電路；軟件上采用Qt的人機(jī)界面完成數(shù)據(jù)顯示與更新，采用PPP撥號(hào)腳本完成GPRS模塊的撥號(hào)，通過(guò)Qt多線程編程的方法完成GPS數(shù)據(jù)的提取和GPRS的信息發(fā)送。在硬件和軟件之間采用了嵌入式Linux系統(tǒng)，包括啟動(dòng)代碼、內(nèi)核和文件系統(tǒng)等。
In 1960, R.E. Kalman published his famous paper describing a recursive solution
to the discrete-data linear filtering problem. Since that time, due in large part to advances
in digital computing, the Kalman filter has been the subject of extensive research
and application, particularly in the area of autonomous or assisted
NAVigation.
In 1960, R.E. Kalman published his famous paper describing a recursive solution to the discretedata
linear filtering problem [Kalman60]. Since that time, due in large part to advances in digital
computing, the
Kalman filter
has been the subject of extensive research and application,
particularly in the area of autonomous or assisted NAVigation. A very “friendly” introduction to the
general idea of the Kalman filter can be found in Chapter 1 of [Maybeck79], while a more complete
introductory discussion can be found in [Sorenson70], which also contains some interesting
historical narrative.
Contents at a Glance
Introduction 1
PART I INSTALLATION AND CONFIGURATION 5
Hour 1 Preparing to Install Linux 7
2 Installing Linux 23
3 Post-Installation Issues 41
PART II LEARNING LINUX BASICS 67
Hour 4 Reading and NAVigation Commands 69
5 Manipulation and Searching Commands 93
6 Using the Shell 117
7 Using the X Window System 143
8 Exploring the K Desktop Environment 177
PART III CONNECTING TO THE OUTSIDE WORLD 197
Hour 9 Using Communications Programs 199
10 Connecting to the Internet 223
11 Configuring Internet Email 249
12 Configuring Internet News 269
13 Internet Downloading and Browsing 289
The fluid editor is a prototype source code editor supporting a "bring from" exploration model.With the fluid editor programmers can avoid explicit NAVigation between source documents by incorporating related code into the document under examination
用AVR單片機(jī)設(shè)計(jì)的MP3播放器
功能：
MP3 Player
IDE ATA interface
FAT 32 with long file name support
USB interface
On board power supply (input from 7v to 20v DC)
Bootloader firmware upgradeable via USB port
Infrared bi-directional interface
Remote Control
Back light graphic LCD
worked with only 2x AA batteries
In sleep mode sink less than 1uA (2.5mA in active mode)
5 buttons for easy NAVigation
Long range (more than 20 feets)
This paper deals with the issue of incorporating pseudolite measurements into an integrated Global Positioning System/
Inertial NAVigation System ~GPS/INS! positioning and attitude system with a view to improving signal availability, solution reliability, and
accuracy in a localized area
