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Farming by Satellite. Seth Crawford, Marketing Manager, Ag Management Solutions Ron Hatch, Director Navigation Systems NavCom Technology, Inc. Second 80 Years 1918 John Deere Buys Waterloo Boy Tractor. First 80 Years 1837 John Deere Makes Self Scouring Plow.

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farming by satellite

Farming by Satellite

Seth Crawford, Marketing Manager,

Ag Management Solutions

Ron Hatch, Director Navigation Systems

NavCom Technology, Inc

80 80 80

Second 80 Years

1918 John Deere Buys

Waterloo Boy Tractor

  • First 80 Years
  • 1837 John Deere Makes
  • Self Scouring Plow
in the beginning
In the beginning…
  • GPS introduced on combines - Mid 1990s
    • Yield Documentation
farming by the foot
Farming by the foot
  • Variable Rate Applications
    • Seed
    • Chemicals
  • Enhanced Documentation
    • Management
    • Compliance
high cost of implement overlap
High cost of implement overlap
  • Up to 10% or more overlap on every pass
  • Wastes fuel, chemicals, fertilizer, seed
  • Drag on efficiency, productivity
  • Under-utilization of equipment
  • Environmental concerns

Global GPS

Tracking Network

Global Corrections

Broadcast to Users


Internet &

ISDN Links

Reliable Low

Latency Data Links

Two Hot Hubs

StarFire™ DGPS System Overview

Uplink to



the navcom tm itc starfire receiver
The NavComTM iTC StarFire Receiver
  • Is a dual-frequency (L1 & L2) receiver with WAAS and Inmarsat StarFire correction channels
  • The L1 receiver has direct access to the L1 signal
  • The P-code L2 signals cannot now be directly accessed.
  • Since the L1 signal also has the P-code present, the L2 signal can be accessed by cross-correlation with the L1 signal—with significant loss of signal-to-noise.
starfire rtk rtk extend tm
StarFire™ RTK & RTK ExtendTM

January 2004

  • High accuracy and repeatability:  1 in (2 cm)
  • Receivers on machine and base station
  • Base station transmits radio correction signal to eliminate GPS drift
  • Vehicle can travel same path or track
  • Repeatability is the key advantage
  • RTK ExtendTM uses the StarFire correction signal to extend operation to areas where the communication signal from the base station is unavailable
benefits of gps guidance
Benefits of GPS Guidance
  • Minimizes input costs
  • Reduces operator fatigue
  • Improves productivity
guidance payback
Guidance Payback
  • “The pay off on a DGPS guidance system can be as little as a year to a year-and-a-half, so it holds the potential of being a high-return investment." Purdue University Study
benefit of the new l2c signal
Benefit of the new L2C signal
  • The recent launch of the first modernized GPS Satellite allows direct access to the L2 signal
  • This gives a much stronger signal tracking availability for the removal of ionospheric refraction effects upon the GPS signals
  • The direct benefit is to make guidance by GPS significantly more robust.
  • Example: Signal and accuracy is often lost along field boundaries where trees interfere with the signal
benefit of the new third frequency l5
Benefit of the new third frequency (L5)
  • The launch of modernized GPS satellites in 2007 with the L5 frequency will enable improved RTK performance. Three frequencies allow:
    • Faster initialization of the RTK whole-cycle ambiguities
    • Significantly longer operating distances from the reference receiver and therefore fewer reference receivers required to cover the same area
    • Unique Deere/NavCom method of using the three frequencies for RTK ambiguity resolution—Patent No. 6,934,632
john deere ag management solutions

John Deere Ag Management Solutions


Barry Nelson – Manager, Public Relations

(913) 310-8324