source:Industry News release time:2022-08-20 Hits: Popular:realtime gps tracker online
The positioning accuracy can be investigated under static and dynamic conditions, and the effect of dynamic positioning is better than that of static positioning. The nominal positioning parameters of the GPS module are measured in a completely open sky with good satellite signals. Therefore, it is difficult to achieve the nominal positioning time and positioning accuracy in conventional tests. There are two common description methods for horizontal positioning accuracy: one is ?m CEP, that is, the circle probability error, which means that the measured point has a 50% probability of being located in a circle with the real coordinates as the center and ?m as the radius; The second is ?m 2DRMS, that is, 2 times the horizontal mean square root error, which means that the measured point has a probability of about 95.5% to be located in a circle with the real coordinates as the center and ?m as the radius.
The positioning accuracy of the GPS module depends on many aspects, such as the satellite clock error and orbit difference from the GPS system, the number and geometric distribution of visible GPS satellites, solar radiation, atmosphere, multipath effects, etc. In addition, the same GPS module will have different positioning errors due to antenna and feeder quality, antenna position and direction, test time period, open sky range and direction, weather, and PCB design. Even if different GPS modules of the same manufacturer and the same model use the antenna diversity to test at the same time, the static drift will be different.
GPS module is often used as a time reference in practical applications, supplemented by the RTC inside the module, a very high-precision time reference can be obtained, which provides great convenience for product design. As for GPS speed measurement, it is just an extended application of simple calculation based on obtaining longitude and latitude.
The common antenna of GPS is a ceramic panel antenna. This antenna has a low cost and an external active amplifier circuit. The direction of the received signal is single and the gain is relatively high, so it is used the most. But its disadvantage is that it is bulky and susceptible to frequency drift due to temperature. If the ceramic area is made small, it will affect the receiving gain; if it is made thin, it will affect the receiving bandwidth of the receiving antenna, and it will also be affected by the active amplification part. The size that works well at present is 25×25×4mm3. Ceramic patch antennas work best when placed vertically upwards in actual use.
The signal transmission line of the GPS antenna is also very important, including the external feeder and PCB traces. The maximum output power is possible only when the impedance is matched. Therefore, the entire transmission line must ensure a high-frequency impedance of 50Ω. For how to design the RF trace impedance on the PCB, some small software can help you easily calculate.
Read recommendations:
How to do car GPS positioning in a car rental company.obd2 gps tracker verizon distributors
GPS cannot use the problem of vehicle power supply.plug & play Obd gps tracker manufacturer
Last article:Basic knowledge of GPS satellite positioning system
Next article:Components of a GPS system
Related Information
obd-II port gps tracker
2023-04-11simple gps tracking custom
2023-04-23vehicle gps tracker webfleet solutions
2023-04-11real-time gps tracking supplier
2023-04-23mini gps tracker
2023-04-11portable gps tracker wholesaler
2023-03-16GPS Trackers custom
2023-04-11GPS Tracker custom
2023-04-11gps tracker for bike
2023-04-11fleet gps tracking price
2023-04-23G01 Smallest Personal Old People Mini GPS Tracker for Kids
2022-06-19G200NY -Cow/Camel GPS Tracker
2022-06-21YG119- Hunting Dog GPS tracker
2023-10-0710000mAh Magnetic Asset GPS Tracker
2025-04-08G900LS 8 Lines-4G Car GPS Tracker
2025-03-31What are the basic functions of vehicle gps locator?plug & play Obd gps tracker
2023-03-23The difference between GPS positioning and GPS navigation tools.plug & play Obd gps tracker supp
2023-05-09The reason why it is an important navigation that it is inseparable.realtime gps tracker online Prod
2023-04-25The manufacturer summarizes all the functions of the monitoring system
2023-05-09GPS Control Center
2022-09-05Application in GPS tourism.plug & play Obd gps tracker Processing
2023-05-06GPS Snitch real-time target tracking
2022-10-12GPS tracker brings boon to bird conservation
2022-09-17GPS Application field
2022-10-20Bluetooth GPS
2022-10-10GPS module.gps vehicle tracker Solution
2023-07-12Introduction to GPS Platform
2022-11-09gps vehicle tracker.Provide a complete set of solutions for the application field of GPS positioning
2023-11-06GPS Logistics Tracking and Monitoring Application Solution
2023-02-02GPS components
2022-11-03