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Published byBrook Alisha Daniels Modified over 8 years ago
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Precision Farming Creating A RTK Network - Overview
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RTK Network Overview What are They? Each Base Station is Independent Base Stations can be Surveyed To Common Coordinates Direct hook up to the closest Base Station Why Are they Important? Accuracy, Repeatability, Reliability Key Strategic and competitive Advantage Take the Base Station Out of the Buying Decision What are RTK networks ?
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RTK Network Overview What are They? Each Base Station is Independent Base Stations can be Surveyed To Common Coordinates Direct hook up to the closest Base Station Why Are they Important? Accuracy Repeatability Reliability What are RTK networks ?
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RTK Network Overview Hardware 1.Fixed Base station Kit 2.Plastic waterproof box and pre-assembled safety parts 3.UHF coax cabling choose depending on length 4.GPS coax cabling choose depending on length 5.UHF radio antenna choose depending on frequency range Radio Frequencies Minimum 3 frequencies (ideally 5) 2 Watt radio power Appropriate location Site survey Power Safe and easy to access High point Clear view of the sky What do we need ? Base 1 Freq 1 Base 2 Freq 1 Base 3 Freq 1 Interferences
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RTK Network Overview What do we need ? AgGPS RTK Base 450 Fixed Base Station with 450-470 Mhz radio ZTN60500-66 Contains following components:
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RTK Network Overview What do we need ? Plastic waterproof box and pre-assembled safety parts 73321385 Power socket 2P power circuit breaker 6A Power lightning protection GPS cable lightning protection UHF cable lightning protection
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RTK Network Overview Cable Affects Radio Performance Use High Quality Cable to Minimize Loss Tradeoff: Quality vs. Cost What do we need ? UHF Coax Cable (Base station - radio antenna) Ecoflex 15 50 Ohm Ǿ:14,6 mm -5 m 73321386 -10 m 73321387 -15 m 73321388 7/8 Flexline 50 Ohm Ǿ:28,0 mm -20 m 73321389 -25 m 73321390 -30 m 73321391 -35 m 73321392 -40 m 73321393 -45 m 73321394 -50 m 73321395 NB; Cables fitted with correct connectors to connect to the antenna / base station
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RTK Network Overview What do we need ? GPS Coax Cable (Base station - GPS antenna) CFD400 50 Ohm Ǿ:10,3 mm -20 m 73321396 -30 m 73321397 -40 m 73321398 -50 m 73321399 NB; Cables fitted with correct connectors to connect to the antenna / base station
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RTK Network Overview What do we need ? UHF radio antenna 73321400
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RTK Network Overview10 Completion Kit Part Numbers For Base Station Installation SectionDescriptionCNH Part Number LIST PRICE (£) Section 1 RTK Base Station Fixed RTK Base Station ZTN60500-667344.00 Section 2 Plastic waterproof box and pre-assembled safety parts - this kit includes: a) plastic waterproof box b) 2P power circuit breaker 6A c) Power lightning protection d) GPS cable lightning protection e) UHF cable lightning protection 73321385597.30 Section 3 UHF coax cabling Ecoflex 15 50 Ohm Ǿ:14,6 mm - 5 meters 7332138652.38 Ecoflex 15 50 Ohm Ǿ:14,6 mm - 10 meters 7332138778.11 Ecoflex 15 50 Ohm Ǿ:14,6 mm - 15 meters 73321388102.92 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 20 meters 73321389220.54 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 25 meters 73321390255.46 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 30 meters 73321391291.30 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 35 meters 73321392327.14 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 40 meters 73321393362.97 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 45 meters 73321394397.89 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 50 meters 73321395433.73 Section 4 GPS coax cabling CFD400 50 Ohm Ǿ:10,3 mm - 20 meters 7332139648.70 CFD400 50 Ohm Ǿ:10,3 mm - 30 meters 7332139766.16 CFD400 50 Ohm Ǿ:10,3 mm - 40 meters 7332139883.62 CFD400 50 Ohm Ǿ:10,3 mm - 50 meters 73321399101.08 Section 5 UHF radio antenna 0.00 Procom antenna CXL 70-3LW/hFrequency range 440-470 MHz 73321400206.76 Section 6 Spare parts Lightning protection spare Fuse kit - this kit includes: 1 unit of fuse 2 units of spark fuse 73321402114.86 What do we need ?
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RTK Network Overview Steps to install Area Survey Distance Between Stations Based on Radio Coverage RTK Error Increases at 2mm/km At 20km => 20mm + 40mm ±(10 mm + 1 ppm) RMS, ± (0.38 in +1 ppm) RMS Radio Coverage Will Vary by Location, Antennas 15km (9 miles) Range is Good Rule of Thumb with a 2 Watt radio (single base station only) Place Base Stations to Optimize Coverage Fill in Holes with Repeaters
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RTK Network Overview Steps to install Area Survey NB; Actual coverage will vary with terrain, obstructions, radio antenna model, radio antenna height, and other factors. To estimate the coverage range of each base station, use a radius of 10 km with a 2 Watt radio.
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RTK Network Overview Steps to install Area Survey Determine Where Coverage is Needed Use a Local Map Topo Map Topo SW Package Look for Possible Base Station Sites High Ground Easy Access Existing structures Factors That Affect Radio Performance Terrain Obstructions Foliage “Can You Hear Me Now?” Survey Coverage Area with Radio 95% CMR Packets is Optimal
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RTK Network Overview Steps to install Area Survey GPS Coverage – Look Up Clear View of Sky Minimal Multipath Sources Radio Coverage - Look Out Above Local Obstructions Existing Structure or Free Standing Tower Look Down Site Security Power Accessibility
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RTK Network Overview Steps to install Installation 1.5 - 2 m Above highest obstruction Reduce the risk of multipath errors Clear view of the sky Rigid mounting Any GPS antenna movement will translate into vehicle movement Square : 50 x 50 x 3 mm Round : Ø 42 x 3 mm GPS Antenna
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RTK Network Overview Antenna Height is the Single Biggest Factor in Radio Performance Above Local Obstructions Antenna Mounting Options Existing Structures Access Interference with Other Antennas Free Standing Towers Radio antenna movement not important Steps to install Installation Radio Antenna
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RTK Network Overview Steps to install Installation
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RTK Network Overview Steps to install Installation
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RTK Network Overview Base station Survey why? Make sure the positions will not change inside the Network Without Position Survey Base 1 Base 2 Base 3 With Position Survey Steps to install - Survey
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RTK Network Overview Step 1 : Obtain a pass code for data logging capability Step 2 : Update the receiver for data logging capability Step 3 : Configure the base station Step 4 : Run the data logging for 24 hours Step 5 : Extract the data from the receiver Step 6 : Install desktop software to convert logged data to RINEX format Step 7 : Start the post processing procedure Step 8 : Update and save the receiver’s location Step 9 : Start the base station within the network Steps to install - Survey
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Precision Farming Creating A RTK Network - Security
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RTK Network Overview22 RTK encryption New System currently in Alpha test Firmware update Ag450 base stations Will allow base operator to create secure code Expire date to be set by base operator Firmware update for GPS on tractors to de-encrypt All current RTK receivers included Up to 5 codes possible on each receiver Expiry dates allow dealer to manage customer accounts Pass code entry Ag remote directly to GPS receiver (EST) Or via display. Update required.
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RTK Network Overview23 RTK Security Page on FM-1000 RTK encryption
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