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44 Cards in this Set
- Front
- Back
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What does Dr. Wong like to call precision farming?
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Site specific crop management
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Precision farming is _______ _______ _____ _____ ____.
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Precision farming is the use of Technology for site management
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________ has to do with a change in Distance and Depth
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Spatial Variability
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_________ has to do with a change in time
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Temporal Variability
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what are the 4 promises of precision farming?
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Economics, Efficiency, production, and environment
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What are the three Satellite Positioning systems?
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GPS (United States)
Glonass (Russia) EGNOS (European) - GALILEO |
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Who developed GPS?
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Ivan Getting, Bradford Parkinson
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With regard to the timeline for the development of GPS, what happened in:
1960's 1969 1973 1978 1995 |
-1960’s - Feasibility studies begin
-1969—Defense Navigation Satellite System (DNSS) formed -1973 - Pentagon approp g pp p g riates funding -NAVSTAR Global Positioning System developed -1978—first 4 satellites launched -System declared fully operational in April, 1995 |
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How many satellites are part of the GPS system?
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24 satellites
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How many orbital planes are part of the GPS system?
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6 orbital planes
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GPS satelite orbit is Inclined _____* with respect to the equator
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55*
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GPS orbits are separated by _____*
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60*
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How high above earth are the orbiting GPS satellites?
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20,200 km elevation above earth
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What is the Orbital period of a GPS satellite?
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11 hr. 55 min.
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_____ to _______ satellites visible from any point on Earth
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five to eight
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How many atomic clocks do the Fourth Generation Satellites contain?
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4 each
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How many and what is the material of the batteries on each GPS vehicle?
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three nickel-cadmium batteries
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how many solar panels are on each GPS vehicle?
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2 solar panels
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What is used to control the GPS satellite?
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S band antenna
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What is used to communicate with the GPS satellite?
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12 element L band antenna
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GPS signal is picked up at _________
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T (time) + 3
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The distance between satellite and receiver = __________ times the speed of light
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3 times the speed of light
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What is the preferred element used for the atomic clock? What does it measure?
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Cesium Cs-133, Oscillation Frequency
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What are some sources of GPS signal interference?
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atmosphere, power lines, buildings, Lamborghini's?
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What are the 5 GPS sources of error?
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1. Satellite Clocks
2. Satellite Orbits 3. Earth’s Atmosphere 4. Multipath Errors 5. GPS Error |
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Base stations are used to correct GPS satellites by means of __________
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Differential Correction (DGPS)
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This is used to provide differential GPS correction to a local area
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User supplied Base station
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This system was put in place to allow airplanes to use GPS more effectively.
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Wide Area Augmentation System (WAAS)
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What are the two privately held satellite based augmentation systems
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Navcom (John Deere), OmniSTAR
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What was used to monitor position in agriculture before GPS?
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Disk marker (early 1980s)
Foam markers (late 1980s) |
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What are the three levels of automation?
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Navigation aids,
Auto-guidance (auto-steer), Field Robots |
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This is used to eliminate compaction in 70% of the field
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Controlled Traffic
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with control traffic farming less than ______% of the land is driven over
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30%
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CTF has a promise of ____% yield increase.
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7%
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_____________ is the use of sensors mounted on a combine measuring yield as the crop is harvested.
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yield monitoring
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Yield monitoring provides immediate feedback of what three useful data?
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Nutrients,
Moisture, pest pressures |
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______ is used in order to stop monitoring yield when the header is raised
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header position switch
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________ is the system time adjustment in yield monitoring systems for the seed to pass through the detection system
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operation delay
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cotton yield is monitored with a ______ sensor
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light
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This handheld device prints out receipts to track and monitor yield of fruits and vegetables
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T3 pocket tracker
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What are three benefits of soil sampling?
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1) Evaluate soil properties (ie. hard pan, moisture, and the profile of the soil.)
2)Maximize yields 3) Determine fertility requirements for crops to minimize inputs |
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for soil sampling the smaller/larger your grid size the more accurate your results are.
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smaller
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______ is an agriculture implement that is used to measure electrical conductivity which is a way to measure soil texture.
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Veris Cart
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_______ is an automatic core sampler implement
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AutoProbe
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