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1
Content available remote Visibility and geometry of global satellite navigation systems constellations
100%
Januszewski J.
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tom Vol. 50, No. 4
169--180
EN
Nowadays (November 2015) there are two global fully operational satellite navigation systems, American GPS and Russian GLONASS. Two next are under construction, Galileo in Europe and BeiDou in China. As the error of observer’s position obtained from these systems depends on geometry factor DOP (Dilution Of Precision) among other things the knowledge of the number of satellites visible by this observer above given masking elevation angle Hmin and the distributions of DOP coefficient values, GDOP in particular, is very important. The lowest and the greatest number of satellites visible in open area by the observer at different latitudes for different Hmin, the percentage of satellites visible above angle H (9 intervals, each 10O wide), distributions (in per cent) of satellites azimuths (8 intervals, each 45O wide) and GDOP coefficient values (8 intervals) for Hmin = 5O for all these four systems at different observer’s latitudes (9 intervals, each wide 10O wide) are presented in the paper. Additionally the lowest elevation for which the number of satellites visible at different latitudes by the observer in open area above this angle is equal 4 or 3 and the distributions (in per cent) of GDOP coefficient values for different Hmin at observer’s latitudes 50-60O for the same four systems are showed. All calculations were made for constellation of GPS 27 satellites, GLONASS 24, Galileo 30 and BeiDou 27 MEO satellites.
2
Content available remote Translative covering of a square by a sequence of arbitrary-oriented squares: Part II
100%
Januszewski J.
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tom Vol. 41, nr 2
441-454
EN
Given a collection of squares of arbitrary side lengths whose total area is at least 3. Then the unit square can be covered by translates of these squares.
3
Nawigacyjne systemy satelitarne na drogach wodnych Europy
100%
Januszewski J.
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2008
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tom [nr] 9
86--99
PL
W żegludze śródlądowej pozycja jednostki określana jest na bieżąco metodami klasycznymi, w związku z czym prowadzący jednostkę zna nieprzerwanie jej aktualne położenie. By pozycja ta mogła być sygnalizowana na ekranie mapy elektronicznej ECDIS czy też przesłana innym użytkownikom w postaci cyfrowej, musi być również określana takimi metodami, które to umożliwiają.
4
Zastosowanie czerpni terenowej do ogrzewania i chlodzenia powietrza wentylacyjnego
100%
Januszewski J.
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nr 07
18-19
5
Content available remote Combined constellations GPS and Galileo systems
100%
Januszewski J.
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tom Vol. 41, No. 2
67--77
EN
As for the users of satellite navigation systems the actual slogan is GPS and Galileo the advantages and disadvantages of different combined constellations of these systems must be taken into account. The distributions (in per cent) of the numbers of satellites visible by the observer at different latitudes situated in open and restricted (urban canyon) area for different masking elevation angles (Hmin) for two combined constellations GPS + Galileo systems (I 29 GPS satellites + 27 Galileo satellites, II 29 GPS + 30 Galileo) are presented in this paper. In addition to it the detailed distributions for the observer at latitudes 5060O for other constellations & elevation angles are demonstrated. For the first constellation the difference between the number of GPS satellites visible by the observer above horizon (Hmin = 0O) at latitudes 5060O and the number of Galileo satellites visible by the same observer at the same time can be equal each number between plus 7 and minus 7. This fact must be taken into account in the production and the determination of the number of channel of GPS-Galileo integrated receivers.
6
Content available Shipborne satellite navigation systems receivers, exploitation remarks
100%
Januszewski J.
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tom nr 40 (112)
67--72
EN
Currently (July 2014) an uninterrupted information about the ship’s position can be obtained from specialized electronic position-fixing systems, in particular, Satellite Navigation Systems (SNSs) as GSP and GLONASS and Satellite Based Augmentation Systems (SBASs) as EGNOS or WAAS. On each ship’s bridge one GPS stationary receiver is installed at least but on many ships there are two or even more GPS receivers. Nowadays, several hundred different end-user products and broad/chipset/modules are available on the world market, however for ship’s bridge several dozen models provided by a dozen or so manufacturers are designed only. In this paper 309 GPS receivers, 47 different models of 12 manufacturers installed on 188 ships of different types and with different lengths were taken into account. The relations between the type and the length of the ship, the number of the GPS receivers installed on one ship, the manufacturers and the models the most frequently used are presented.
7
Content available remote On-line covering the unit square with squares
100%
Januszewski J.
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tom Vol. 57, no 1
57-62
EN
The unit square can be on-line covered with any sequence of squares whose total area is not smaller than 4.
8
Klimatyzacja duzych sal uzytecznosci publicznej
63%
Januszewski J.
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nr 03
18-20
9
Content available Badania dynamiki zmywów powierzchniowych gleb na podstawie wieloczasowych pomiarów kartograficznych, geodezyjnych i fotogrametrycznych
51%
Januszewski J. , Kazimir P. , Kazimir L. , Fedorowicz-Jackowski W.
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tom Vol. 11
5-41--5-44
EN
Ekosystems which include all organisms living on a given area, together with physical environment, are connected between each other with processes of energy flow and matter circulation. The factors which condition existing of these processes in ecosystems are green plants, animals as well as funga and bacteria. These groups constitute trophic structure in the form of food chains. The general principle of ecosystem reduces to the fact that one organism is a source of food for the other, the latter for the next and so on. Tacing into account diversity of ecosystems, reflecting a series of elements of geographical environment, we deal with thermal diversity of the ground, which in turn, decides about absorption, dissipation or reflection of thermal energy reaching the surface of the Earth. These phenomena, recorded by thermovision systems can be located on thermogrammes. The problem to be discussed is determination of borders between ecosystem groups on the basis of superficial distribution of temperatures on thermogrammes recorded from a plane.
10
Skutecznosc preparatu - Aescotrim Suspension w zwalczaniu chorob bakteryjnych u drobiu
39%
Mazurkiewicz M. , Zalesinski A. , Wieliczko A. , Latala A. , Januszewski J. , Molenda O.
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tom 52
129-137
11
W szponach bialej smierci
38%
Januszewski J.
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nr 1
8-9
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