nmea gps

GPS. Net geoframework is open-source today. From the author's perspective, we can see the helplessness of a technology entrepreneur. HoweverCommunityThis is good news. I also referred to hisCodeAt first, the company planned to purchase his library. Later, because he didn't want to use too many DLL files, he planned to write an NMEA analyzer. The code in this library is very well written and useful for

Mobile manages the ing of GPS ports, so GPS supports multipleProgramRun simultaneously. During GPS development, we can read NMEA metadata from the GPS hardware and parse it according to the protocol. Of course, you can also use the existing open-source class libraries. I hav

get the device, and dev-> get_gps_interface= Gps _ get_gps_interface to obtain the GpsInterface. The upper layer can use eight interfaces, such as init. The upper layer imports gpsCallbacks when using the Init interface. In this way, the connection is established up and down. Next, gps_state_init initializes the GPS serial port, establishes gps_state_thread, and starts the for (;) loop to control

For details about how to accept the GPS time-Linux general technology-Linux technology and application information, see the following. The problem is that in linux (version is ubuntu10), the ntp server can synchronize the Network Time, but cannot synchronize the gps time. Add the following in make meunconfig: Kernel timer client (Testing client, use for debug) PPS line discipline {MB} 8250

1. Prepare GPS (Global Positioning System), which uses 24 GPS satellite ranging and time-measuring functions for global positioning, in many systems, such as airport navigation systems, rental vehicle management and dispatch systems, and river basin disaster information management and forecasting systems, GPS has been widely used. In this paper, the

satellite, which is compiled and modulated into a certain frequency of electromagnetic waves to broadcast to the Earth at a certain frequency. The Earth receives these satellite signals through a receiver, parses the data contained in the satellite, and uses the data to calculate based on a certain algorithm to obtain the exact location of the local ball. The principle of satellite positioning is roughly as follows: the distance between the receiver and the satellite can be calculated throug

First, open the simulator. Then, connect to the simulator C: \ Users \ billgates> Telnet localhost 5554 Android Console: Type 'help' for a list of commandsOK 5554 indicates the port of the simulator on the local machine. You can use ADB devices to view the Port: C: \ Users \ billgates> ADB Devices List of devices attachedEmulator-5554 Device Connect to the simulator and enter the HELP command to view help. Enter the command and press enter to view the command format. GEO is

Transferred from Http://hi.baidu.com/fenglinggoto/item/ab480234277d254b3075a1d9 Introduction to u-blox A-GPS Solutions GPS applications are becoming increasingly popular. Vehicle Navigation and PDA/PND portable navigation devices are widely used in the market. In addition to combining photos, audio and video playback, it also gradually enters pedestrian walking navigation from Vehicle Navigation, with more

Abstract: In the WiTadowsCE embedded system, the serial port is used to implement GPS and PDA communication. First, introduce the data format of the GPS signal, and describe the system's hardware and software environment and serial communication. Finally, the GPS signal processing module is designed to describe in detail how to use the embedded programming langua

GPS decoding is actually very simple. Generally, if the GPS module is powered on, it will not stop sending packets. You can check the next few packets to understand it. For more information, see the NMEA protocol. Most useful packages are strings starting with $ uplmc. Replace the UTC time plus 8 with the UTC time in the UTC time zone, and then replace the latit

0 IntroductionThe maturation and development of GPS technology provide a powerful guarantee for the precise and real-time positioning of all kinds of moving vectors. such as the use of GPs to the vehicle or ship navigation and monitoring [2]. At the same time, with the development of information technology, the size of PDA becomes more and more compact, and the function of integration becomes more and more

This paper expounds the method of using serial port to realize GPS and PDA communication in WITADOWSCE embedded system. Firstly, the data format of GPS signal is introduced, and the software and hardware environment of the system and serial communication are described. Finally, the design of GPS signal processing module, detailed description of how to use embedd

Real-time kinematic real-time dynamic difference method. This is a new and commonly used GPS measurement method. Previous static, fast static, and dynamic measurements all need to be calculated afterwards to achieve centimeter-level accuracy, the GPS-based GPS is a measurement method that can obtain centimeter-level positioning accuracy in real time in the field.

Turn from: https://zhuanlan.zhihu.com/p/32638633 In the last share, I made an introduction to the technical framework of Baidu Apollo plan, as shown in the picture. Apollo1.0 automatic driving on closed site If you want to complete the Apollo 1.0 "closed site tracking Automatic driving" function, we need to solve an important problem: I (unmanned vehicle) where. "Where I am" is completely dependent on the GPS (Global Positioning System) and IMU (ine

Original site: http://www.cnblogs.com/magicboy110/archive/2010/12/09/1901669.htmlThere are many professional materials about GPS theory on the network, and this paper tries to introduce the basic principle of GPS positioning in a way that programmers can easily understand, hoping to enlighten the friends who do GPS development. Of course, this article does not i

Global Positioning System (GPS) is a new generation of space satellite navigation and positioning system developed by the United States armed forces in the 70 's. Its main purpose is to provide real-time, all-weather and global navigation services for the three major areas of land, sea and air, and for some military purposes, such as intelligence collection, nuclear explosion monitoring and emergency communications, and is an important component of th

The safety of GPS is not a new topic. The most famous example would be the 2011-Year-old Iranian hijacking of American drones [1]. December 4, 2011, the United States, a RQ-170 unmanned aircraft, flying in Iranian airspace. Instead of shooting it down, the Iranian military used some sort of GPs deception to make the plane land in Kashmar, north-eastern Iran. The intact drone provides the Iranian military w

Design of GPS Smart terminal based on embedded ARM-Linux GPS Smart terminal is an important part of Intelligent Transportation System (ITS System). It integrates satellite positioning technology (GPS), geographic information system (GIS) and wireless communication technology. Currently, satellite positioning terminals are gene