RTLS accuracy vs update rate

RTLS accuracy precision

Before we start,  let’s go over these therms meening. Accuracy is a degree of closeness to actual object location(in case of rtls). It’s measured in meter. Update rate is a rate that shows how many times per second our object location is measured. Update rate is is measured in Hz or times per second value. Let’s see what are the main differences between these two.

In general, accuracy is limited by hardware itself. For example accuracy of Wi-Fi signal is limted by 2m. GPS accuracy is about 4 meters. Some RTLS systems allow you to track objects with 10cm ration. In most of the cases hardware itself won’t track an object with better accuracy. Althought, more tracking devices would allow a user to implement filters to increase an accuracy. In this case accuracy ratio is determined by square root of numbers of tracking devices. All this is possible because of software filtering systems and not always is determined by factor of square root. In cases of more complicated distribution systems, more suffisticated formulas are used.

Update rate allows us to increase accuracy by using previously collected date. In case when tracked object speed is not too high or update rate is very high, so object won’t travel a huge distance between measurements, we can use previously collected data to improve positioning system infomation. Using technologies like that would add more calculations to the system, which will reduce system performance and in some cases will lower down update rate. Whenever two way ranging is used, system will have a little delay for calculation of data before transmiting a data futher.



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