source:Industry News release time:2022-12-06 Hits: Popular:realtime gps tracker online
????
????GPS positioning accuracy can be inspected under static and dynamic conditions, and the dynamic positioning effect is better than the static positioning. The nominal positioning parameters of the GPS module refer to those measured in a fully open sky with good satellite signals. Therefore, it is difficult to achieve the nominal positioning time and positioning accuracy in conventional testing. There are two common methods to describe horizontal positioning accuracy: one is "horizontal positioning accuracy", and the other is "horizontal positioning accuracy"? M CEP, namely circle probability error, means that 50% probability of the measured point is located at a circle center with the real coordinate as the center, and the probability of the measured point is 50%? M is within the circle of radius; Second is? M 2DRMS, i.e. twice the average root mean square error of water, means that there is about 95.5% probability that the measured point is located at a circle center with the real coordinate as the center? M is within the circle of radius.
????The positioning accuracy of the GPS module depends on many aspects, such as the satellite clock error and orbit error from the GPS system, the number and geometric distribution of visible GPS satellites, solar radiation, atmosphere, multipath effect, etc. In addition, the same GPS module will generate different positioning errors due to antenna and feeder quality, antenna position and direction, test time period, open sky range and direction, weather, PCB design, etc. Even if different GPS modules of the same manufacturer and model are tested simultaneously with antenna diversity, the static drift will be different.
????The GPS module is often used as the time reference in practical applications, supplemented by the RTC inside the module, which can obtain very high precision time reference, providing great convenience for product design. As for GPS velocity measurement, it is only an expanded application of simple calculation based on longitude and latitude.
????The common antenna of GPS is a ceramic flat antenna, which has low cost, an external active amplifier circuit, a single direction of receiving signal, and a high gain ratio, so it is widely used. However, its disadvantage is that it is large in size and prone to frequency drift caused by temperature. If the ceramic area is smaller, the receiving gain will be affected; If it is thinned, the receiving bandwidth of the receiving antenna will be affected, and it will also be affected by the active amplification part. The size with good use effect is 25 ? twenty-five ? 4mm3?? The ceramic antenna has the best effect when it is placed vertically upwards in actual use.
Read recommendations:
real-time gps tracking Production
Last article锛?The obvious advantages of GPS products (actual effect)
Next article锛?GPS performance indicators
Related Information
fleet tracking webfleet solutions
2023-03-16Gps speed limiter Factory
2023-04-23Cantrack GT06
2023-04-11car gps tracker Manufacturing
2023-04-23simple gps tracking company
2023-04-23fleetmanagement webfleet solutions
2023-03-16gps vehicle tracker supplier
2023-04-11Dog gps tracker maker
2023-04-23Car gps tracking manufacture
2023-04-23gps vehicle tracker Processing
2023-04-11TK08AL- RFID Car GPS Tracker
2023-10-07P60L Personal gps tracker
2022-06-21G02M Pet Tracker
2022-06-19G500M-Mini GPS Tracker
2022-06-20Mini Sized GPS Tracker PCBA
2022-06-17What do you think the gps tracker does?
2022-09-13How to measure radar, GPS, Beidou and radio positioning.gps tracker for trailer Processing
2023-05-12How to install and use the car GPS positioner
2023-02-14What are the key points for purchasing in car GPS.personal gps tracker Solution
2023-06-16The complete installation step of the wiring car GPS positioner
2023-03-28Precautions for installation of 4G wiring GPS positioner.obd2 gps tracker verizon wholesaler
2023-04-11Calibration method for Beidou/GPS fuel sensor of large trucks.gps vehicle tracker
2023-09-18Classification and cause analysis of lithium battery explosion
2022-10-18GPS Function Introduction
2022-11-02GPS/GPRS power-off terminal
2022-12-20Summarized the application of Beidou satellite.Car gps tracking distributors
2023-06-08What kind of Bluetooth GPS do you choose?fleetmanagement webfleet solutions
2022-11-16Car GPS Navigation System
2022-11-04GPS market prospects.gps tracker no monthly fee company
2023-05-24gps vehicle tracker.How to activate and use a previously installed GPS car locator in the car
2023-10-13