Applicability of GPS guidance for tractors | Primenljivost GPS navođenja
2009
Martinov, M., Fakultet tehničkih nauka, Novi Sad (Serbia) | Gavrić, M., Telvent DMS, Novi Sad (Serbia) | Kiš, F., Tehnološki fakultet, Novi Sad (Serbia) | Brunet, B., Pokrajinski sekretarijat za poljoprivredu, vodoprivredu i šumarstvo, Novi Sad (Serbia) | Micković, G., RES Trade, Novi Sad (Serbia) | Veselinov, B., Fakultet tehničkih nauka, Novi Sad (Serbia) | Bojić, S., Fakultet tehničkih nauka, Novi Sad (Serbia)
The GPS guidance of tractors and self propelled agricultural machinery reached the level applicable in practice. It is also followed by the reduction of price, i.e. utilization costs. The objectives of the investigation were: to test availability of common DGPS signals in Serbian agricultural region Vojvodina as example, to systematize types of guidance systems for the potential users, farmers, and to create background for profitability calculation of GPS guidance use. The results showed that the common correction signals, EGNOS, StarFire 1 and StarFire 2, are available in the region and that navigation, dynamic, errors are in the proclaimed range. The guidance systems are classified according to the class of precision-dynamic error, steering automation, and integration into tractor-machine steering and control system. The backgrounds for economic evaluation are based on comparison of costs and saving, i.e. payback period. Common calculation based on investment and operational expenditures was used to calculate the costs. Costs benefits calculation, when GPS guidance was used, was based on the calculation which included working time, overlapping area and inputs reduction. The table of expected overlapping area that occurs by common farming operation, created as result of questionnaire of experienced professionals, was developed to be a base for this calculation. The final outcome of the calculation could be the number of cultivated hectares that enable payback in defined period, e.g. three years. For example, by using simple GPS guidance systems, with navigation error up to 0.3 m between two adjacent tracks, and manual steering, the profitability could be obtained for cultivating less than 100 hectares of field crops.
显示更多 [+] 显示较少 [-]