truck tracking webfleet solutions

Home > NEWS > Other information > truck tracking webfleet solutions

Company News

Industry News

Dog tracker.The positioning principle of GPS module

source:truck tracking webfleet solutions release time:2024-03-04 Hits:     Popular:realtime gps tracker online

  

  Roughly speaking, the ground coordinates and their conventional geographic features (i.e. spatial resection) are obtained by measuring the distance from an in orbit satellite (which determines it to be a known data) to a ground point. Because the position variables in the equation include XYZ and clock deviation T, the number of accepted satellites must be greater than or equal to 4.

  In the positioning process, there are two methods to obtain the pseudorange (i.e. the distance with errors) from the satellite to the ground: 1. ranging code; 2. Carrier phase.

  1. The ranging code belongs to pseudo-random noise code, which is a binary code sequence. The key is to measure the time difference between the transmitted signal and the received signal, which is obtained through atomic clock synchronization. Due to the refraction of the carrier wave carrying the ranging code when passing through the current layer, ionospheric errors are generated. Solar activity has an impact on the total electron density of the ionosphere, so it can also have an impact on GPS positioning. According to our teacher, there was a period of time when GPS could not be used due to solar flares.

  2. If a satellite S emits a carrier model (which is used as a ranging signal here), the signal propagates to various places. At a certain moment, the phase of the signal at receiver R is ψ R. At satellite S ψ S. Note that what is mentioned here is ψ R, ψ S is the complete carrier phase, including the entire number of cycles, calculated from the same starting point. The distance between the satellite and the ground ρ=λ ( ψ S- ψ R) .

  As can be seen from the above, if the corresponding phase number is inaccurate or cannot be directly obtained, then GPS will not work. In addition, during the measurement process, if the altitude angle of the satellite (the angle between the satellite and the ground level) is too small, it is also impossible to perform measurement and positioning. In summary, during the measurement period, there were no four or more satellites, the altitude angle was too small, there were obstructions such as high-rise buildings, intense solar activity, the position and operation of satellites in orbit, and the condition of the receiver may all cause GPS to be unable to locate or inaccurate.


Read recommendations:

Gps speed limiter Solution

car gps tracker distributors

G05N Vehicle Tracker

GPS predecessor

Four major GPS systems in the world

Last article:Gps speed limiter.Working principle of GPS Bluetooth positioning technology

Next article:GPS Tracker.Application of GPS module

Related Information

gps tracker no monthly fee

2023-04-11

obd-II port gps tracker

2023-03-16

gps tracker for kids supplier

2023-04-23

Dog gps tracker

2023-04-23

GPS Trackers wholesale

2023-04-11

Hidden GPS Trackers supplier

2023-04-23

CantrackGPS

2023-03-16

gps tracker for bike

2023-03-16

fleet gps trackers Processing

2023-04-23

Dog gps tracker Processing

2023-04-23

GF70L-Solar Magnetic Asset GPS Tracker

2023-10-07

Mini Sized GPS Tracker PCBA

2022-06-17

G200(L) -Magnet GPS Tracker

2022-06-20

G900LS J16-4G Car GPS Tracker

2023-10-06

NB20 -4G Bluetooth Smart Pet Tracker

2022-06-21

Two major trends of GPS navigators

2022-08-10

GPS function.gps vehicle tracker wholesaler

2023-06-07

GPS Function Introduction

2022-10-27

AGPS and GPS technical principles

2022-10-14

GPS FPGA Program Design

2022-11-10

Opportunities brought by national policies for GPS industry

2022-12-17

Overview of the car navigation system.Magnetic gps tracker Manufacturing

2023-05-18

Gps speed limiter.The world's four major satellite positioning and navigation systems

2023-10-19

Composition of GPS system

2022-08-12

The application and implementation of CAAC BeiDou is divided into three stages.car gps tracker Manuf

2023-06-13

gps vehicle tracker.The System Architecture and Main Functions of Bus GPS Monitoring and Dispatching

2023-11-03

The role of UAV GPS module

2022-10-13

The manufacturer summarizes the main application scope of Xi'an's long standby GPS.obd2 gps tracker

2023-04-08

Mobile GPS.plug & play Obd gps tracker wholesale

2023-05-20

GPS application in wild animals.gps tracker no monthly fee manufacturer

2023-04-24