Verify the accuracy of the GPS device to buy back, the way is to use Android under the'gps state 'software, to test the accuracy of real-time single point positioning.1 with two sets of the same Android Tablet Computer (custom machine, type of bad) in the same position for receiving, find that the accuracy is the same (software, are 1-2 meters), but the position would be poor 10 meters or more. It's in the same place.The 2 one is the Android tablet computer, a mobile phone is HTC G10, also received together in the same position, find that the accuracy is not the same as (the latter 20 meters or so), but also may be about 10 meters position difference.The accuracy of this GPS device can reach 1-2 meters, while the same location in real-time single point positioning error of 10 meters, a reasonable explanation.
You are very normal, the tablet computer and mobile phone antenna, not inside, the highest accuracy is about 10 meters, as ordinary navigation is good enough, to achieve centimeter level accuracy by GPS single is, that is to achieve the RTK measurement, is the application of professional measurement, now RTK or by the United States GPS satellite, not the United States GPS satellite as China Beidou mobile station and the base station is in need of mutual difference calculation to achieve accurate measurement. Now the single can receive SBAS signal, single precision up to 1-2 meters, the Northeast in some places to achieve sub meter level, which is the highest single precision can reach, is also used in field investigation using professional machine.
Oh, together with the exchange of learning, mutual verification, I said that is my experience. Software tells you that the accuracy is handled and limited, especially for some third party software. If you do not limit the scope of the conditions, the limit is too difficult to determine. If the satellite in poor condition, serious occlusion, satellite time difference, let alone ten meters, a few dozen a hundred meters are possible. Under normal circumstances, single point positioning accuracy is about ten meters, of course, sometimes all aspects of the conditions are very good, a few meters are also some. As for the accuracy of the GPS that you say htc10 and tablet computer, to this kind of navigation type GPS, from the respect of the respect that the instrument says, the accuracy should be in 10 meters to 15 meters (all the conditions are all right). Oh exchange!
Oh the single point positioning accuracy is about 10 meters, but also have a great relationship with the environment around you, if in the city, the accuracy of twenty meters are possible, if the open place, outside. Ten meters should not be a problem. Whether you use a professional measurement RTK or ordinary navigation handheld machine, single point positioning accuracy can reach 1-2 meters of the machine I is not met, if you see where I wish to share with me, thank you. Can only say that the use of professional measurement RTK will certainly be higher than the navigation accuracy of GPS single point oh
10 meters.To the world in 2013 a total of four global satellite navigation system, in addition to the United States has been in the mature GPS system and commercial operation, the Beidou system, China the European Galileo system, the Russian GLONASS system are still under construction. "The Galileo satellite navigation project" was first conceived by the 30 satellite GPS network to compete with the United States, the beginning of the design proposed in 2008 formally put into operation, and later postponed to 2014, the entire system is only 4 satellites in orbit (as of 2012), in fact it is mainly used to further verify the relevant design and the working system of the system design, after the official start of Galileo satellite will launch. Formal networking satellites are being prepared. China satellite navigation system management office senior engineer Yang Qiangwen introduction, to 2012, the "system" in orbit satellites are also only verify satellite.
