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:
GF30 Magnet GPS tracker with Voice listen
Application introduction in agriculture.gps tracker with magnet manufacturer
The GPS positioner on the electric car is installed to allow the city's traffic safety and intellige
Last article锛?Why does the GPS module take a long time to obtain positioning data after being turned on?mini gps t
Next article锛?GPS module NMEA0183 standard statement.portable gps tracker Factory
Related Information
real-time gps tracking wholesaler
2023-04-23Dog gps tracker Vendor
2023-03-16GPS Trackers price
2023-04-11gps tracker for kids
2023-03-16real-time gps tracking supplier
2023-04-23GPS Tracking Factory
2023-04-11vehicle gps tracker Factory
2023-04-23fleet management software webfleet solutions
2023-03-16mini gps tracker manufacturer
2023-04-23gps tracker for bike
2023-03-16P60L Personal gps tracker
2022-06-21TK200AM-Disposable GPS Tracker
2022-06-214G Wired GPS Tracker PCBA
2022-06-17TK08A Motorcycle GPS Tracker
2022-06-20TK100N- Multi functional GPS Tracker
2023-10-06GPS navigator software.Hidden GPS Trackers wholesaler
2023-06-10GPS positioning monitoring system
2023-02-06GPS maintenance.obd2 gps tracker verizon maker
2023-06-09What is the form of car GPS positioning system
2022-08-12How to purchase GPS locators?
2023-02-21What are the elements of buying a driving recorder.gps tracker no monthly fee wholesale
2023-05-09Development Trend of Automotive GPS Positioning System
2022-08-26GPS navigator component-global positioning system
2023-05-16Principle of GPS indoor positioning technology
2022-11-25National GPS application field
2022-12-17Recommended Minimum Specific GPS/TRANSIT Data (RMC) GPS recommended positioning information
2022-09-28Installation of GPS navigator
2022-10-14Car GPS positioning system.Gps speed limiter Production
2023-05-26The editor tells everyone where car GPS is usually installed.obd-II port gps tracker sales
2023-06-16GPS development
2022-11-26