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 tracker with magnet Vendor
Last article:GPS radar detector
Next article:High precision timing system based on GPSD
Related Information
simple gps tracking supplier
2023-04-234G GPS Tracker for vehicles wholesale
2023-04-23Dog gps tracker manufacture
2023-04-23gps vehicle tracker custom
2023-04-23gps vehicle tracker Manufacturing
2023-04-23Dog gps tracker Manufacturing
2023-04-23car gps tracker supplier
2023-04-234G GPS Tracker Factory
2023-04-23GPS Tracking custom
2023-04-11pet gps tracker cat Manufacturing
2023-03-16G900LS 8 Lines-4G Car GPS Tracker
2026-04-29YG119- Hunting Dog GPS tracker
2023-10-07G900LM J16-4G Car GPS Tracker
2026-04-29GF30 Magnet GPS tracker with Voice listen
2022-06-21GF70L-Solar Magnetic Asset GPS Tracker
2023-10-07Beidou Satellite Positioner.hang tag button manufacture
2023-06-06How to reduce the risk of car loan in car positioning terminals
2023-02-16The role of GPS
2022-08-10GPS pseudo -distance measurement introduction.gps tracker for trailer distributors
2023-04-20Global GPS Receiver
2022-08-16Car GPS locator.gps tracker with magnet sales
2023-06-20The GALILEO GPS system consists of 10 signals in four frequency bands.
2022-10-11Simulator test GPS
2022-10-10GPS addressing locator
2023-07-27The advantage of mobile phone GPS navigation.GPS Tracker for vehicles Production
2023-05-09GPS increases value for customers
2023-02-02Detailed introduction to the function of the car GPS positioner.gps tracker no monthly fee distribut
2023-03-10Determination of ambiguity in GPS reference station network
2023-07-03The IGS technology of GPS.GPS Tracker for vehicles distributors
2023-08-14GPS mobile engineering mode.gps tracker device wholesale
2023-07-14Related 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...