truck tracking webfleet solutions

Home > NEWS > Other information > truck tracking webfleet solutions

Company News

Industry News

Introduction to GPS module.Dog gps tracker manufacturer

source:truck tracking webfleet solutions release time:2023-07-12 Hits:     Popular:realtime gps tracker online

  

  The GPS positioning module, which we often refer to as the user part, receives and demodulates satellite broadcast C/A code signals like a "radio", with a center frequency of 1575.42MHz. The GPS module does not broadcast signals and belongs to passive positioning. By calculating the pseudo distance with each satellite and using the distance intersection method, the receiver's four parameters of longitude, latitude, altitude, and time correction are obtained. The characteristic is that the point position speed is fast, but the error is large. The initial positioning module requires at least 4 satellites to participate in the calculation, called 3D positioning. Three satellites can achieve 2D positioning, but the accuracy is poor. The GPS module continuously outputs positioning information and auxiliary information in NMEA format through the serial communication port for the receiver to choose applications.

  The * price indicators of GPS module performance mainly include reception sensitivity, positioning time, position accuracy, power consumption, time accuracy, etc. The positioning time of module startup varies greatly under different startup modes. Generally speaking, the cold start time refers to the situation where there is no data stored inside the module that helps with positioning, including ephemeris, time, etc., which is usually nominal within 1 minute; Warm start time refers to the time when there is a relatively new satellite ephemeris inside the module (usually no more than 2 hours), but the time deviation is significant, usually within 45 seconds nominal; The hot start time refers to the situation where the shutdown does not exceed twenty minutes and the RTC time error is very small. Generally, the nominal time is within 10 seconds; Recapturing time is like a car drilling through a tunnel and capturing satellites again when it exits. Generally, the nominal time is within 4 seconds.

  If the module is stored for a long time after positioning, or if the module is transported hundreds of kilometers away after positioning, there will be an ephemeris inside the module, but this ephemeris is incorrect or has no reference significance. In these cases, the positioning time may take several minutes or even longer. So generally, when GPS modules leave the factory, they need to clear the ephemeris and other data inside the module, so that customers can quickly locate them through cold start after receiving the module.

  The positioning accuracy can be evaluated in both static and dynamic situations, and the dynamic positioning effect is superior to static positioning. The nominal positioning parameters of the GPS module refer to measurements made under fully open skies with excellent satellite signals. So it is difficult to achieve the nominal positioning time and positioning accuracy in conventional testing. There are two common ways to describe horizontal positioning accuracy: first? MCEP, namely Circular error probable, means that 50% probability of the measured point is located in a circle with the true coordinate as the center? Within a circle with a radius of m; The second is? M2DRMS, that is, twice the water average root mean square error, means that there is a 95.5% probability that the measured point is located in a circle with the true coordinate as the center? Within a circle with a radius of m.


Read recommendations:

real-time gps tracking wholesale

Portable car gps systems Manufacturing

P60L Personal gps tracker

mini gps tracker.What are the differences between Beidou and GPS?

Timing method of GPS synchronous clock

Last article:Why does the GPS module take a long time to obtain positioning data after being turned on?mini gps t

Next article:GPS module NMEA0183 standard statement.portable gps tracker Factory

Related Information

gps tracker for trailer

2023-04-11

GPS Trackers price

2023-04-11

cantrack g05

2023-04-23

gps vehicle tracker manufacture

2023-04-23

real-time gps tracking Factory

2023-04-23

gps vehicle tracker Solution

2023-04-23

Pet GPS Tracker distributors

2023-03-16

simple gps tracking wholesale

2023-04-23

simple gps tracking

2023-04-11

pet gps tracker cat price

2023-03-16

GF30 Magnet GPS tracker with Voice listen

2022-06-21

YG119- Hunting Dog GPS tracker

2023-10-07

G01 Smallest Personal Old People Mini GPS Tracker for Kids

2022-06-19

TK100 (GT06) Vehicle Tracker

2022-06-20

G05N Vehicle Tracker

2022-06-21

Bluetooth GPS Disadvantages

2022-10-19

The main error and elimination algorithm in GPS positioning

2023-02-10

GPS satellite error.realtime gps tracker online manufacturer

2023-04-23

Bring a GPS tracker and never be afraid of losing it again!

2022-09-15

GPS installation points

2022-10-08

The principle of GPS indoor positioning technology

2022-08-12

Is the Beidou Navigation System the Beidou Map App?Asset tracking custom

2023-02-18

Bluetooth GPS.Gps speed limiter wholesaler

2023-07-05

The following aspects mainly affect the performance of GPS antenna

2022-11-12

Car GPS Global Positioning System

2023-02-09

GPS smart bus stop sign

2022-09-05

A - GPS positioning

2022-10-25

gps vehicle tracker.How to detect if a GPS locator has been stolen and whether it can be completely

2023-10-19

Beidou Satellite GPS Trajectory.gps tracker no monthly fee distributors

2023-08-18

The main role of driving recorder.gps tracker with magnet Manufacturing

2023-04-15