Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: DPGS

Sortuj według:

Ogranicz wyniki do:

Relative accuracy of DGPS

Banachowicz Andrzej, Banachowicz Grzegorz, Wolski Adam

Annual of Navigation

2022

No. 28

46--52

It is important to know the accuracy of navigational parameters while analyzing them. This refers not only to position coordinates, although position determination or the assessment of a GPS system often involves navigational parameter accuracy. Generally, accuracy is the degree of consistency between the measured or estimated value of a given quantity and its real value. Accuracy is usually interpreted as a statistical measure (or statisticaldeterministic measure) of measurement errors. Relative accuracy is used in reference to radionavigational systems. According to the USCG Navigation Center Federal Radionavigation Plan, relative accuracy is the accuracy at which the user can determine a position relative to another user by means of the same system at the same time. Another approach is presented in geodesic and hydrographic publications, where both local accuracy and the relative ellipsis of errors are given. This article will attempt at combining and generalizing the two concepts in the form of relative position vector accuracy. The generalized definition of that accuracy is based on a theorem on the difference of random vectors and the concept of crosscovariance matrix of two random vectors. The concept of relative (differential) accuracy can be extended to cover any kind of measurements. When there is a significant positive correlation, differential measurements should be used, as is the case in hyperbolic systems. On the other hand, summing systems are more accurate in cases where negative correlation is significant. Elliptical systems would be the right ones for positioning systems. Theoretical considerations are illustrated with practical examples of relative accuracy assessment in which AIS (DGPS) is used in ship-to-ship or ship-VTS communication. In the case of an AIS system, both positions are independently determined, but can be correlated through a common (D)GPS or another system. It is a classical example of relative accuracy application. It can also be used in a repeated assessment of hydrographic survey accuracy on condition that we possess recorded raw measurements of position coordinates or other measurements of position parameters.

Rolnictwo precyzyjne najnowszą techniką mechanizacji polowej produkcji roślinnej

Mielec K., Kobylarz J.

Prace Przemysłowego Instytutu Maszyn Rolniczych

1998

Vol. 43, nr 3

7-13

Wprowadzona już od kilku lat do praktyki rolniczej nowa metoda prowadzenia prac polowych z wykorzystaniem satelitarnego systemu lokalizacji obiektów naziemnych (GPS) rozwijana jest dynamicznie w USA, Kanadzie i niektórych krajach Europy Zachodniej, jak np. w Niemczech. GPS i jego modyfikacja, to jest system DPGS, umożliwiają prowadzenie zróżnicowanej miejscowo gospodarki polowej zgodnie z precyzyjnie określonymi wymaganiami i możliwościami poszczególnych miejsc (części) danego pola. Gospodarka taka nazywa się rolnictwem precyzyjnym. W artykule omówiono istotę oraz niektóre ważniejsze aspekty techniczne, a także korzyści płynące ze stosowania tej nowej i młodej jeszcze techniki mechanizacji prac polowych oraz perspektywy jej zastosowania w krajowym rolnictwie w Polsce.

The Global Positioning System (GPS) which was by the USA made available for agricultural purposes gives the chance to apply more ecological agricultural techniques. Origin and prospects of the GPS and the problems connected with adaptation of Polish domestic agricultural machines to the new system are described in the paper. It is stated that in applying precision farming in Poland it is reasonable - partly to buy adequate agricultural equipment at the leading world firms and partly to develop some elements of the system in the country. Especially the sensors measuring output ought to be redesigned in the country and adjusted to the domestic agricultural machines.