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:
Issues that need attention during the purchase of GPS vehicle terminals.plug & play Obd gps trac
How to connect the mobile phone of the Beidou GPS positioner?gps tracker no monthly fee wholesaler
Last article:Basic knowledge of GPS satellite positioning system
Next article:Components of a GPS system
Related Information
gps tracker for trailer
2023-04-23OBD GPS Tracker
2023-03-16OBD GPS Tracker custom
2023-04-11gps vehicle tracker supplier
2023-04-11gps tracker app distributors
2023-04-23real-time gps tracking Manufacturing
2023-04-23real-time gps tracking Solution
2023-04-23Dog gps tracker Manufacturing
2023-04-23gps vehicle tracker Vendor
2023-04-23personal gps tracker
2023-04-11TK100 (GT06) Vehicle Tracker
2022-06-20G900LM-4G Car GPS Tracker
2025-03-25G500L -4G OBD GPS Tracker
2022-09-06G09L -6 inch Tail light tracker
2022-06-20G02M Pet Tracker
2022-06-19The manufacturer believes how to determine the radar, GPS, Beidou and radio positioning.gps tracker
2023-06-17What are the advantages of electric vehicle GPS positioner?
2023-04-03High precision timing system based on GPSD
2022-11-18GPS monitoring system develops rapidly
2022-12-07How to effectively control the risk of car loan companies?
2023-02-16What are the GPS satellites?gps tracker for trailer manufacturer
2023-04-21What are the different types of car GPS?
2023-06-15Car GPS Navigation System
2022-11-04Composition unit of on-board system
2022-12-09Mobile number positioning, tracking, and finding people operation process.portable gps tracker whole
2023-09-14GPS position difference principle
2022-10-11What is GPS dual -frequency positioning technology?obd-II port gps tracker Manufacturing
2023-03-11Advantages of GPS technology
2022-10-22Manufacturer introduces in detail the component of the car positioner.simple gps tracking wholesale
2023-06-08The role of truck installation of Beidou positioning system.obd-II port gps tracker distributors
2023-04-10