Transcript Slide 1
Precision Farming Creating A RTK Network - Overview What are RTK networks ? 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 RTK Network Overview What do we need ? Hardware 1. 2. 3. 4. 5. Fixed Base station Kit Plastic waterproof box and pre-assembled safety parts UHF coax cabling choose depending on length GPS coax cabling choose depending on length UHF radio antenna choose depending on frequency range Radio Frequencies Base 2 Freq 1 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 RTK Network Overview Base 1 Freq 1 Base 3 Freq 1 Interferences What do we need ? AgGPS RTK Base 450 Fixed Base Station with 450-470 Mhz radio ZTN60500-66 Contains following components: 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 RTK Network Overview What do we need ? UHF Coax Cable (Base station - radio antenna) Cable Affects Radio Performance Use High Quality Cable to Minimize Loss Tradeoff: Quality vs. Cost 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 RTK Network Overview NB; Cables fitted with correct connectors to connect to the antenna / base station What do we need ? GPS Coax Cable (Base station - GPS antenna) CFD400 50 Ohm Ǿ:10,3 mm -20 m -30 m -40 m -50 m 73321396 73321397 73321398 73321399 NB; Cables fitted with correct connectors to connect to the antenna / base station RTK Network Overview What do we need ? UHF radio antenna 73321400 RTK Network Overview What do we need ? Completion Kit Part Numbers For Base Station Installation CNH Part Number LIST PRICE (£) ZTN60500-66 7344.00 73321385 597.30 Ecoflex 15 50 Ohm Ǿ:14,6 mm - 5 meters 73321386 52.38 Ecoflex 15 50 Ohm Ǿ:14,6 mm - 10 meters 73321387 78.11 Ecoflex 15 50 Ohm Ǿ:14,6 mm - 15 meters 73321388 102.92 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 20 meters 73321389 220.54 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 25 meters 73321390 255.46 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 30 meters 73321391 291.30 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 35 meters 73321392 327.14 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 40 meters 73321393 362.97 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 45 meters 73321394 397.89 7/8 Flexline 50 Ohm Ǿ:28,0 mm - 50 meters 73321395 433.73 CFD400 50 Ohm Ǿ:10,3 mm - 20 meters 73321396 48.70 CFD400 50 Ohm Ǿ:10,3 mm - 30 meters 73321397 66.16 CFD400 50 Ohm Ǿ:10,3 mm - 40 meters 73321398 83.62 CFD400 50 Ohm Ǿ:10,3 mm - 50 meters 73321399 101.08 73321400 206.76 73321402 114.86 Section Section 1 Description RTK Base Station Fixed RTK Base Station Section 2 Section 3 Section 4 Section 5 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 UHF coax cabling GPS coax cabling UHF radio antenna Procom antenna CXL 70-3LW/hFrequency range 440-470 MHz Section 6 0.00 Spare parts Lightning protection spare Fuse kit - this kit includes: 1 unit of fuse 2 units of spark fuse RTK Network Overview 10 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 RTK Network Overview Steps to install Area Survey To estimate the coverage range of each base station, use a radius of 10 km with a 2 Watt radio. NB; Actual coverage will vary with terrain, obstructions, radio antenna model, radio antenna height, and other factors. 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 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 RTK Network Overview Steps to install Installation GPS Antenna • 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 RTK Network Overview Steps to install Installation Radio Antenna 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 RTK Network Overview Steps to install Installation RTK Network Overview Steps to install Installation RTK Network Overview Steps to install - Survey Base station Survey why? Make sure the positions will not change inside the Network Base 2 Without With Position Position Survey Survey Base 1 Base 3 RTK Network Overview Steps to install - Survey 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 RTK Network Overview Precision Farming Creating A RTK Network - Security 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. RTK Network Overview 22 RTK encryption RTK Security Page on FM-1000 RTK Network Overview 23