source:truck tracking webfleet solutions release time:2023-12-20 Hits: Popular:realtime gps tracker online
1、 Satellite trajectory
Currently, GPS has 24 satellites orbiting the Earth along six orbits, and there are generally not more than 12 satellites on the same side of the Earth. Most GPS receivers can track 8-12 satellites. Calculating two-dimensional coordinates requires at least three satellites, and adding one satellite can calculate three-dimensional coordinates. For a specific location, the receiver knows which satellites are nearby, and the principle is to continuously receive signals from the satellites for updates.
2、 Parallel channel
Generally, ordinary GPS devices receive satellite signals through 2-5 parallel channels. According to the rule that up to 12 satellites may be on the same side, the GPS receiver must sequentially access each satellite to obtain relevant data information.
Most high-end GPS receivers are 12 parallel channels, which allows them to track the information of each satellite at once. Its advantages include fast cold start and initialization of satellite information, especially in forest areas where better reception performance can be achieved. Generally, a 12 channel receiver does not require an external antenna, unless in a closed space, such as a cabin or carriage.
3、 Positioning time
The positioning time is generally the time it takes to determine the current position when restarting the GPS receiver. For a 12 channel receiver, if it is located near the last positioning position, the cold start positioning time is about 4 minutes and the hot start is about 20 seconds, while for a 2 channel receiver, if the cold start exceeds 16 minutes, the hot start also takes 4 minutes.
4、 Positioning accuracy
When SA is not turned on, the horizontal positioning accuracy of most GPS receivers is around 10m.
5、 DGPS function
In order to minimize the impact of SA and atmospheric refraction, there is a device called DGPS transmitter. It is a fixed GPS receiver that, when receiving satellite signals, can accurately determine the exact time at which the satellite signals are transmitted in theory. Then, it compares it with the actual transmission time and calculates the difference, which is very close to the impact of SA and atmospheric refraction. When sent out, other GPS receivers can use it to obtain a more accurate position reading.
Many GPS device providers have set up DGPS transmitters in some regions for their customers to use for free, as long as the GPS receivers purchased by customers have DGPS functionality.
6、 Signal interference
To achieve good positioning, a GPS receiver requires at least 3 satellites to be visible. If you are in a dense jungle, canyon, or on a street lined with tall buildings, you may not be able to connect with enough satellites, so you can only locate two-dimensional coordinates. Similarly, if inside a building, it may not be possible to update the location, and some GPS receivers have separate antennas that can be attached to the windshield, or an external antenna that can be placed on the roof, which helps the receiver receive more satellite signals
Read recommendations:
G09L -6 inch Tail light tracker
Last article:gps vehicle tracker.Is the GPS anti-theft device good
Next article:Gps speed limiter.Key data of GPS module - speed accuracy
Related Information
fleet gps trackers wholesale
2023-04-23fleet gps tracking Factory
2023-04-23gps tracker fur auto webfleet solutions
2023-03-16fleet gps trackers Production
2023-04-23personal gps tracker
2023-04-11mini gps tracker Processing
2023-04-23gps vehicle tracker Factory
2023-04-23Pet GPS Tracker manufacturer
2023-03-16realtime tracking device
2023-03-164G GPS Tracker for vehicles Processing
2023-04-23G500M-Mini GPS Tracker
2022-06-203 Years Disposable Asset GPS Tracker
2025-03-31G900LM-4G Car Mini GPS Tracker
2025-03-25C32Plus (9~90V E-bikes/Motorcycle/Car gps tracker)
2022-06-21G09L -6 inch Tail light tracker
2022-06-20Design of GPS Vehicle Satellite Positioning Simulation System
2022-12-06Actual demand and development trend of GPS market
2022-12-22GPS vehicle satellite positioning simulation system design
2023-02-06GPS helps you avoid the electronic eye
2023-02-02How to install and place the GPS tracker with more accurate positioning and stronger signal
2022-07-14Serial Number Cable Color Wiring Description (Vehicle Signal Line).obd-II port gps tracker Factory
2023-09-14Anti -theft installation and operation introduction of automobile car GPS positioner.gps tracker no
2023-04-04China Beidou Navigation System?
2022-11-17gps vehicle tracker.The role of installing car GPS and Beidou satellite positioning in the road tran
2023-10-26Buses equipped with GPS for private use should be held accountable
2022-08-11GPS electronic dog.gps tracker online Processing
2023-06-09GPS reset did not have a substantial impact on car GPS locators
2023-09-04The difference between manufacturers compare the Beidou satellite navigation system and GPS navigati
2023-06-15Judging the Advantages and Disadvantages of GPS Navigator.4G GPS Tracker manufacturer
2023-07-24Everyone knows about gps trackers, but what is LBS?
2022-09-15