1.1 Introduction to GPS GPS (Global Positioning System) is a new generation of satellite navigation, time service and positioning system developed by the United States in the 1970s. Each of the 2
source:truck tracking webfleet solutions release time:2022-11-18 Hits: Popular:realtime gps tracker online

1.1 Introduction to GPS
GPS (Global Positioning System) is a new generation of satellite navigation, time service and positioning system developed by the United States in the 1970s. Each of the 24 dedicated GPS satellites has its own atomic clock, which can broadcast accurate UTC standard time to the ground 24/7. In the data stream decoded by many universal GPS decoding chips, in addition to location information, it also contains time information (year, month, day, hour, minute, second) and PPS (Pulse Second). PPS identifies the starting point of time information, and its accuracy can reach microsecond level.
1.2 Introduction to timing method
NTP is a protocol used to synchronize computer time. Its synchronization clock source is not limited to the network time server, but also includes clock devices, such as quartz clock, atomic clock, GPS receiver, etc. The NTP server software abstracts these clock sources into corresponding data structures, corresponding to different memory addresses, and synchronizes the computer clock by reading the information in the address and performing statistical algorithm processing.
There are mainly three time calibration schemes using GPS as the synchronous clock source: pulse synchronization mode, serial synchronization mode and integrated mode. The GPSD timing scheme adopted in this paper is a comprehensive way. The comparison of the three methods is shown in Table 1.
1.3 Integrated timing based on GPSD
GPSD (GPS Daemon) is a daemon software used to process the data decoded by the GPS receiving unit. The specific process of GPSD based integrated timing is shown in Figure 1. The GPS antenna receives the GPS signal, transmits it to the G591 chip for decoding, and outputs the data and PPS signal in NMEA0183 protocol format every second. After the MAX 232 completes the level conversion, it transmits them to the computer via the RXD and DCD ends of the serial port respectively; After processing, GPSD software writes accurate time information to specific memory segments; NTP server software reads the time information in this address segment by sharing memory, and then completes the work of correcting the system clock.
Read recommendations:
GPS DOP and Active Satellites (GSA)
Little White-fronted Goose No. 12 spent nearly 4 months in the summer breeding season near the Berin
Last article:GPS radar detector
Next article:High precision timing system based on GPSD
Related Information
mini gps tracker sales
2023-04-23gps vehicle tracker manufacturer
2023-04-23gps vehicle tracker distributors
2023-04-23Magnetic gps tracker
2023-04-11personal gps tracker wholesaler
2023-03-16fleet gps tracking custom
2023-04-234G GPS Tracker for vehicles
2023-03-16mini gps tracker company
2023-04-23realtime gps tracker online
2023-03-16gps vehicle tracker wholesaler
2023-04-23G900LM J16-4G Car GPS Tracker
2026-04-29G01 Smallest Personal Old People Mini GPS Tracker for Kids
2022-06-19G900LM J16-4G Car GPS Tracker
2026-04-294G OBD2 GPS Tracker
2026-04-293000mAh Magnet Asset GPS Tracker
2026-04-29Real time monitoring of police cars by GPS positioning
2022-12-17GPS carrier phase difference principle
2022-10-11China Beidou Navigation System?
2022-11-17What is GPS dual -frequency positioning technology?obd-II port gps tracker Manufacturing
2023-03-11Car GPS Pharmaceutical Pharmacopoeia
2023-05-16The development of electronic maps.personal gps tracker Manufacturing
2023-05-17GPS vehicle navigation system.gps tracker for Car price
2023-08-10The role of GPS satellite.GPS Tracker for vehicles manufacture
2023-04-21Origin of GPS development
2022-12-29China Beidou Navigation System?
2022-11-17GPS satellite positioning is an inevitable trend
2023-02-23Timing method of GPS synchronous clock
2022-11-18GPS Tracking Monitoring Promotes Mobile Logistics Management
2022-12-01GPS helps you avoid the electronic eye
2023-02-02Vehicle Management System Based on Differential GPS Technology
2022-11-07Related Articles

Firstly, let's take a look at why GPS locators are inaccurate and have large errors. GPS positioning accuracy, generally within 10 meters if obtaining Beidou or GPS signals; If it is a signal...

GPS differential positioning technology is an important method to improve the positioning accuracy of the Global Positioning System (GPS). In traditional GPS positioning, satellite signals are af...

Vehicle GPS Navigation System Vehicle mounted GPS navigation system is an indispensable and important device in modern automobiles, providing drivers with convenient and accurate navigation service...

Handheld GPS positioning device is a portable and practical positioning tool widely used in outdoor exploration, geological exploration, forestry investigation and other fields. Handheld GPS posi...

In modern society, high-precision GPS locators play a crucial role. It has brought many conveniences to people's lives and work with its excellent positioning accuracy and reliable performance...

Real time GPS tracker is an advanced technology device that can track target objects in real-time at any time and any place, bringing great convenience to people's lives and work. The core fu...