Precision Farming Creating A RTK Network - Overview

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 ?


Hardware1. 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 1Freq 1

Base 2Freq 1

Base 3Freq 1

Interferences


What do we need ?

AgGPS RTK Base 450 Fixed Base Station with 450-470 Mhz radio ZTN60500-66

Contains following components:


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


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


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


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



7/8 Flexline 50 Ohm Ǿ:28,0 mm - 20 meters 73321389 220.54







Section 4 GPS coax cabling

CFD400 50 Ohm Ǿ:10,3 mm - 20 meters 73321396 48.70




Section 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 ?


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


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.


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


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


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


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


Steps to install

Installation


Steps to install

Installation


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


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 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 Security Page on FM-1000

RTK encryption

Documents

Precision Farming Creating A RTK Network - Overview