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Precision Farming Creating A RTK Network - Overview

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.

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Precision Farming Creating A RTK Network - Overview

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  1. PrecisionFarmingCreating A RTK Network - Overview

  2. 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

  3. Base 2 Freq 1 Base 1 Freq 1 Base 3 Freq 1 What do we need ? • Hardware • 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 • 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 Interferences

  4. What do we need ? AgGPS RTK Base 450 Fixed Base Station with 450-470 Mhz radio ZTN60500-66 Contains following components:

  5. What do we need ? Plastic waterproof box and pre-assembled safety parts73321385 Power socket 2P power circuit breaker 6A Power lightning protection GPS cable lightning protection UHF cable lightning protection

  6. What do we need ? • Cable Affects Radio Performance • Use High Quality Cable to Minimize Loss • Tradeoff: Quality vs. Cost 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 m73321389 • 25 m73321390 • 30 m73321391 • 35 m73321392 • 40 m73321393 • 45 m73321394 • 50 m73321395 NB; Cables fitted with correct connectors to connect to the antenna / base station

  7. 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

  8. What do we need ? UHF radio antenna73321400

  9. What do we need ?

  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

  11. 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 antennamodel, radio antenna height, and other factors.

  12. 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

  13. 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

  14. 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

  15. Steps to install Installation • 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 Radio Antenna

  16. Steps to install Installation

  17. Steps to install Installation

  18. Steps to install - Survey Base station Survey why? Make sure the positions will not change inside the Network Base 2 Without Position Survey With Position Survey Base 1 Base 3

  19. 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

  20. PrecisionFarmingCreating A RTK Network - Security

  21. 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.

  22. RTK encryption • RTK Security Page on FM-1000

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