precision farming creating a rtk network - overview
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Precision Farming Creating A RTK Network - Overview
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 ?
RTK Network Overview
Hardware1. Fixed Base station Kit 2. Plastic waterproof box and pre-assembled safety parts3. UHF coax cabling choose depending on length4. 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 1Freq 1
Base 2Freq 1
Base 3Freq 1
Interferences
RTK Network Overview
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
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
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
RTK Network Overview
What do we need ?
UHF radio antenna 73321400
RTK Network Overview 10
Completion Kit Part Numbers For Base Station InstallationSection Description CNH Part Number LIST PRICE
(£)
Section 1 RTK Base Station
Fixed RTK Base Station ZTN60500-66 7344.00
Section 2
Plastic waterproof box and pre-assembled safety parts - this kit includes:a) plastic waterproof boxb) 2P power circuit breaker 6Ac) Power lightning protectiond) GPS cable lightning protectione) UHF cable lightning protection
73321385 597.30
Section 3 UHF coax cabling 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
Section 4 GPS coax cabling 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 101.08Section 5 UHF radio antenna 0.00
Procom antenna CXL 70-3LW/hFrequency range 440-470 MHz 73321400 206.76
Section 6 Spare parts
Lightning protection spare Fuse kit - this kit includes:1 unit of fuse2 units of spark fuse 73321402 114.86
What do we need ?
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
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.
RTK Network Overview
Steps to install
Area SurveyDetermine 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
• 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
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
RTK Network Overview
Steps to install
Installation
RTK Network Overview
Steps to install
Installation
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
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
Precision Farming Creating A RTK Network - Security
RTK Network Overview 22
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 23
RTK Security Page on FM-1000
RTK encryption