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Missouri | I have found planter wheel speed sensors to be adequate, but in the event GPS or radar are available, they are better alternatives. Wheel speed sensors are only as accurate as their calibration, and that calibration is only accurate in those soil conditions. Changes in soil type/firmness/moisture or tillage vs no-till planting can have varying effects on how the wheel rolls and the resultant amount of slippage.
GPS is more accurate, but can be a little sluggish in response to speed changes. It seems to take a half a second to register speed when starting from a standstill.
I have found radar to be the best in terms of accuracy, repeatability, and response time, although I must include an asterisk with that statement. My observations have been with a John Deere dual beam radar. By nature of the dual beam design, it self-corrects for changes in beam angle, thereby never needs recalibration. I haven't had the opportunity to test single beam radars. | |
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Tell me about GPS Speed Signal waveform...
