We all know that there will be errors in the positioning of the gps locator, so what is the error?
As the source of the answer “Where am I?”, the GPS Global Positioning System has a far-reaching impact on human life.
Regardless of whether you use Apple or Android, when you install most of the software, the phone will pop up a prompt like “Do you want to use location information?”. Once allowed, the software provides a more targeted and accurate service, which is primarily achieved through GPS technology.
However, GPS positioning also has positioning errors, and for the civilian sector, this value is about 10 meters. According to reports, a team of researchers from the University of California said they have reduced this accuracy to 1 meter.
10 meters: A bit accurate but a bit inaccurate.
By receiving information from at least 3 of the 24 satellites, including the position of the satellite and the time the signal was sent, we were able to calculate three radii and draw three spheres in space, and your position is The point where the three spheres meet.
Since GPS uses a medium-distance orbit around the Earth, the distance causes errors to be inevitable. Even with more than 3 satellite data superimposed, the best positioning error is around 10 meters.
Since GPS is actually developed and maintained by the US Department of Defense, it is inevitable that it involves military factors. In the earliest days, because they feared that other countries would use high-precision positioning to attack the United States, they even deliberately increased the error of civilian positioning, which led to the civilian precision of only 100 meters at that time, and this practice was not revoked by the Clinton administration until 2000.
But for the average user, the accuracy of 10 meters is quite awkward. For example, if you are a car in the city, it is difficult to confirm which side of the road you are on if you are not familiar with it.
Improve accuracy: it looks easy to do
There are many ways to further improve the accuracy: the easiest is to reduce the orbit of the satellite, so that the number of satellites that need to be launched in order to achieve coverage will increase dramatically, indirectly increasing the deployment cost of the entire system.
Since the accuracy of the satellite data can no longer be improved, it is only necessary to introduce other data, the most direct of which is to compare the GPS data with the gyroscope data.
This idea was put forward very early, but the problem followed – a huge amount of calculations. GPS data is coordinate data, while gyroscopes give motion acceleration data, and complex comparison processes require a lot of computational power.
This time, the research team from the University of California proposed a new algorithm that can significantly reduce the budget burden, even mobile devices such as mobile phones can also meet.
Currently, this new algorithm has been published in IEEE Transactions, including all the specific steps of implementation. I believe that we will soon be able to enter the actual testing phase from the theoretical stage, and we will know the true performance of this algorithm.
Therefore, data transmission affects the error in GPS positioning.
Post time: Nov-07-2019