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1	Lokalisering av skidor i lössnö : Självständigt arbete i Teknisk Fysik / Positioning of skis in powder snow : Independent Project in Engineering Physics Trella, Fredrik January 2011 (has links) This report studies the possibility of using some sort of radio sender and transmitter in order to position skis lost in powder snow. It is concluded that a RF-solution on the 433 MHz frequency should be the most efficient. Different forms of directional antennas are examined and studies show that in theory the best suited is the so called “Yagi-Uda antenna”. A solution based on using a Receive Signal Strength Indicator value together with the above mentioned directional antenna is developed. To control these different components microprocessors from Atmel is used. These are programmed in C and compiled with Atmel’s own compiler AVR Studio. Despite all efforts it is proven that the prototype does not perform in an adequate way. An alternative solution based on “byte-loss-rate” is then developed and the results are slightly improved. Nevertheless, the directional properties of the antenna are still too poor why other alternatives are discussed. No fully functioning prototype is achieved but good grounds for further development of the prototype into something that fulfills the specifications are produced. skis positining 433 Atmel ATMega AVR sender receiver byte loss rate RSSI Yagi RF USART UART USI skidor lokalisering positionering 433 Atmel ATMega AVR sändare mottagare byte loss rate RSSI Yagi RF USART UART USI

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Lokalisering av skidor i lössnö : Självständigt arbete i Teknisk Fysik / Positioning of skis in powder snow : Independent Project in Engineering Physics