radiowaves in agriculture
Post on 25-Feb-2016
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By Kip Smith
RADIOWAVES IN AGRICULTURE
THEORY OF OPERATION
• Radiowaves travel at the speed of light.
• It is part of the electromagnetic spectrum.
• Waves are measured in two ways, wavelength and frequency.
TRANSMITTERS• An Electronic device which, with the aid of an antenna, produces radio waves.
• Radio Frequency Alternating Current
• Transmitters consist of 5 things
• Power Supply
• Electronic Oscillator
• Modulator
• Power Amplifier
• Tuner
RECIEVERS• A device that receives radiowaves and converts the information to a more usable form.
• A preamplifier processes the “noise” and sends it to the amplifier. The amplifieradds power to boost the signal.
COMMONLY KNOWN FREQUENCIES• Radio Frequencies exsist from exactly 3 khz to 300,000,000 khz (or 300 Ghz)
Communication Style Frequency
Human voice 75-300 hz
AM Radio 535-1605 khz
CB Radio 26.95-27.405 Mhz
Television (Channels 2 -6) 54-72 & 76-87 Mhz
FM Radio 87.5-108.0 Mhz
Verizon iPhone 900 Mhz or 1800 Mhz
GPS Navigation 1.2276 and 1.575 Ghz
Broadcasting Satellites 12.2-12.7 Ghz
ELECTROMAGNETIC SPECTRUM
GLOBAL POSITIONING
• Uses Bands L1 and L2 (1575.42 MHz) and (1227.60 MHz)
• The Clinton Administration opened up GPS signals to the public in 1998.
• We are currently using GPSII technology. GPSIII technology will be launched into space starting in 2014.
WAAS (WIDE AREA AUGMENTATION SYSTEM) &RTK (REAL TIME KINETICS)
It was only required to provide an accuracy of up to 25 ft. but researchers were surprised to find accuracy of 3 to 4 ft.
Consists of three parts:
• Ground Segment
• Space Segment
• User Segment
RTK uses mobile base stations as well as Ground stations to achieve greater accuracy.
The Mobile Station uses a Joey Radio Modem to transfer position to the cab.
JDLINK AND CASE AFS CONNECTAKA “TELEMATICS”
• Ability to track and gain information from vehicles in or away from the field.
• Gain additional technology support from trained technicians 24/7.
• Track farm equipment.
MACHINESYNC
DISPLAY SYNC• Ability to transfer data wirelessly (guidance lines, application rates, population, and test
weight)
• Creates faster information sharing
• Ability to share data BETWEEN displays.
DISPLAY SYNC
SUMMARY
• Radiowaves are all around us
• It takes a minute frequency to broadcast GPS to the entire country
• WAAS is a corrected signal, but corrected with minimal accuracy.
• RTK requires two types of corrections
• John Deere and Case are both looking towards information transferred through radiowaves
QUESTIONS?
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