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Komputerowy system wspomagający walidację kanałów pomiarowych wykorzystujących mikrokontrolery AVR ATmega16

100%

Tabisz R. A. , Olearczyk M.

tom R. 58, nr 11

923-926

Uzasadniono potrzebę tworzenia komputerowych systemów wspomagających walidację kanałów pomiarowych wykorzystujących mikrokontrolery. Zaprezentowano ogólną koncepcję takiego systemu. Opisano opracowany i uruchomiony prototyp przeznaczony do walidacji kanałów pomiarowych wykorzystujących mikrokontrolery AVR ATmega 16. Prototyp ten składa się z części sprzętowej i oprogramowania.

In the paper the need for creation of computer systems for supporting the validation of measurement channels using microcontrollers is justified. The general concept of such a system is presented. There is described the developed and implemented prototype, designed for validation of measurement channels using AVR ATmega16 microcontrollers. This prototype consists of two parts: hardware and software. The hardware is composed of a base which enables creation of the circuit (PS) for measurement signal processing and a module (RW) performing reconstruction of the numerical value of the measured quantities by means of an AVR ATmega16 microcontroller and a PC computer. The software master is called UMD and is written in C#. The slave software is embedded in the microcontroller memory and works with UMD application. The results of preliminary tests of the reconstruction unit (RW) obtained when the AVR microcontroller ATmega16 worked as a frequency counter in the range 0-2 MHz are presented. There are also given the results of preliminary tests obtained in a situation where the same module worked as a DC voltmeter in the range of 0-5 V. The concept of building a system designed to validate the measurement channels using ATmega16 AVR microcontrollers can be successfully applied to other types of microcontrollers.

Accuracy evaluation of Ro-Ro and Ro-Pax ships arrival to the ports

100%

Paulauskas V. , Paulauskas D.

tom Vol. 14, no. 2

397--399

Ro-Ro and Ro-Pax ships works on basis of regular schedule and try keep this schedule as accurate as possible. In same time difficulties during Ro-Ro and Ro-Pax ships voyages like bad weather conditions, waiting time to entry in to port, ship's failures and others, sometime request more time as it was planned initially. Ro-Ro and Ro-Pax ships arrivals in to port evaluation is important not only just for the Ro-Ro and Ro-Pax shipping lines planning but as well it is very important for passengers, transport units (trucks) and port terminals. In this Article are analyzed delay times of Ro-Ro and Ro-Pax ships arrival to port on basis of statistical data and used mathematical models for calculation of the arrival time pass.

Position accuracy evaluation of the modernized Polish DGPS

100%

Dziewicki M. , Szpecht C.

tom nr 4

57-61

Polish Maritime DGPS system has been modernized to meet the requirements set out in IMO resolution for a future GNSS, but also to preserve backward signal compatibility of user equipment. Having finalized installation of the new technology L1, L2 reference equipment performance tests were performed. This paper presents results of the long-term signal measuring campaign of the DGPS reference station Rozewie, which was performed in July 2009. Final results allowed to verify repeatable and absolute accuracy of the system after the modernization. Obtained statistics were compared to past measurements performed in 2005 when previous system infrastructure was in operation.