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Tuesday, 7 March 2017

Accuracy of Gps Coordinates

Have you ever thought that your GPS "off the wall" and at some point in your enclosure measured the route through which you certainly did not run? Or have you measured a different distance than the other runners, even though you ran the same route? Read what all affect the accuracy of GPS and what to do to improve it.

Map available at all times on the wrist.

GPS is now completely inseparable part of sports watches and sport testers. Thanks to relatively accurately monitor your position, because you can get valuable data not only for recording training diary (thanks to which you can then vie with friends and motivate even our Runge call), but also get the latest information about your pace and the distance traveled. In addition, GPS has now practically every mobile phone, there is no reason it along with one of the piles of running applications use it.

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How it works
GPS (Global Position System) is a satellite positioning system operated by the US Department of Defense. His most important part of the orbiting satellites in orbit, which constantly send information about your current location and time (from accurate atomic clocks, each of which carries satellites) by means of radio waves on Earth. Currently active GPS satellites 31, the minimum number required for the system operation across the globe is on the 24th

The whole calculation is actually very complex, it is necessary to take into account various adjustments that uses GPS to further refine, but for understanding Ventures certain simplifications.

To be able to determine your location, you need a GPS receiver that captures that radio signals transmitted from satellites and can not process it. To calculate the position, you need a signal from at least four satellites simultaneously. Based on time signals from the satellites to the device in your hand you can determine how far they are from each of the satellites the receiver is located, and thus calculate its position. Signals from four satellites are needed because the receiver is basically constantly counts (at least) four equations with four unknowns - latitude, longitude, altitude and time. Time is also taken as unknown, because at the exact time of your mobile phone or sporttester really can not rely on (the calculations play a role in nanoseconds).

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The more satellites a GPS receiver for our sky to see (and can capture the signal), the more precisely our position is determined. The satellite is about 20,000 kilometers above the Earth's surface, so the signal is not falling on the earth not strong. Important is to enable the receiver the best "view" of the sky.

The influence of the material has pockets in which phone you have, or how deep in your backpack is. Role overgrown treetops overhead, which have leaves or whether it is just after the rain and the leaves are full of water (water is generally difficult propagation). The situation is exacerbated by the high area of ​​buildings, which limits the view of the sky.

2Dostatek time before start
When you turn on the GPS starts searching for satellites in the sky and process radio signals received from them. In the first phase withdraws GPS lot of other information, such as "health" status of satellites and data about their location. This data is pulled just before the "marker", but also a few minutes after initiating the activity of the background, which has the GPS chip measures your location. At this time, the chip is more busy, and if you have a problem shortly after takeoff with signal quality (for example, runs into the dense forest), it may once again have some impact on accuracy.

For this reason, we recommend venturing GPS must already when the warming up and indulge in the alphabet running or idle as 30 minutes before an important race to at least some data from satellites updated in advance. After grabbing a GPS, you can suspend / activate and deactivate up before the race. You will see that now catches more quickly.

3Frekvence measurement
Some sport testers allow you to set the frequency with which store data about your position during the measurement. The shorter the frequency, the more accurate the recording. Normally, a mobile application store or sport testers position every second. In the investigation, but sometimes by batteries or sport testers also allow storage at longer intervals (for example once every 10 seconds or longer), which may have on the accuracy of the recording negative effect. So do not forget to check the settings.

GPS is not the only system for positioning. Some sport testers and mobile phones can also work with the Russian GLONASS system, which works on a principle similar to GPS. Equipment often handle position data from both systems combined. But it depends on implementation. It is reported that the Russian GLONASS is due to the orbits of satellites better coverage in the northern part of the country. GPS but achieves slightly better accuracy. For example Garmin sport testers some users have reported that turning off GLONASS (done by setting) in some models sport testers and firmware versions rid of problems with inaccurate recording of their paddocks. Producers promise but mostly due to a combination of both systems improvements rather accuracy.

if are not satisfied with the accuracy of his record, try experimenting with the settings of both systems. For mobile phones, but the ability to configure mostly absent, because it is a fixed property firmwaru. 5AktualizujteV finally affects the accuracy of GPS receiver itself also. There are many manufacturers of GPS chips that are responsible for receiving and processing GPS signals.

Even when compared to the past today downright bad GPS chip encounter far less frequently, a large influence plays and software (firmware) that the manufacturer to the device recorded. Better sport testers offers firmware updates that often correct errors or improve the quality of the recording. If you have such a heart rate monitor, do not forget to regularly update. A similar situation is in mobile phones, where applications do have limited opportunities (because only take longer calculated location data from the GPS chip and firmware), they have the option to filter out obviously flawed data or edit recording frequency.