Buried Wire Guidance Amplifier Filter Design
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Solution Overview
Problem
Current irrigation machine guidance systems face challenges in reliably detecting buried wires due to poor signal strength over long distances, interference from vegetation and electrical sources, and difficulty in areas with obstructions or nearby power lines.
Innovation Solution
A filter and amplifier system using a 5th order active high pass filter cascaded with a 5th order active low pass filter, configured to remove noise outside the 700 Hz to 1500 Hz frequency band, amplifies the signal to improve guidance accuracy for irrigation machines operating in challenging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection antenna is used to detect the electromagnetic signal from the buried wire, then the guidance signal can be received, but the signal strength becomes poor over distances exceeding 8-10 feet
Solution Approach 1:
A signal amplifier is introduced as an intermediary device between the detection antenna and the guidance receiver. The amplifier receives the weak electromagnetic signal from the antenna, amplifies it to adequate strength, and then outputs it to the guidance receiver, enabling reliable detection at distances beyond 8-10 feet
Solution Approach 2:
The signal amplifier changes the amplitude parameter of the electromagnetic signal by providing adjustable gain control. This allows the weak signal from distant wires to be strengthened to usable levels while maintaining the original signal characteristics for accurate guidance
2Adaptability or versatility
If the detection antenna operates in high vegetative density crops, then the guidance system can function, but the signal strength deteriorates due to attenuation from vegetation
Solution Approach 1:
The signal amplifier serves as a mediator that compensates for signal attenuation caused by vegetation. It receives the weakened signal from the antenna after it has passed through the vegetative barrier and restores it to sufficient strength for reliable guidance operation in high crop density areas
Solution Approach 2:
The amplifier provides dynamic gain adjustment capability that can be tuned based on the vegetation density and signal attenuation conditions. This allows the system to adapt to varying crop heights and densities, maintaining reliable operation across different agricultural environments
3Adaptability or versatility
If the detection antenna is used in areas with electrical interference sources, then the guidance system can operate, but the detection accuracy deteriorates due to noise interference
Solution Approach 1:
The system uses band-pass filtering to convert the problematic electrical noise into a benefit by selectively passing only the desired oscillator frequency while rejecting harmonics and other interference. The amplifier works in conjunction with the filter to strengthen the clean, filtered signal while leaving the noise components suppressed
Solution Approach 2:
A band-pass filter is introduced as an intermediary between the antenna and amplifier that selectively passes only the desired frequency range while blocking harmful electrical interference and harmonics from power lines and variable-frequency drives, thereby improving detection accuracy in electrically noisy environments
4Adaptability or versatility
If the guidance system detects buried wires near underground pipes or neighboring wires, then operation is possible, but detection reliability deteriorates due to obstructions
Solution Approach 1:
The signal amplifier acts as a mediator that strengthens the guidance signal after it has passed through obstructive ground elements. By providing sufficient gain, it ensures that the signal remains detectable even when attenuated by nearby underground pipes, concrete, or other ground obstructions
Solution Approach 2:
The system performs preliminary signal amplification before the weak signal becomes lost in noise or completely attenuated by obstructions. This preliminary action ensures that even signals weakened by passing through concrete or near metal pipes remain above the detection threshold
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables reliable buried wire guidance for irrigation machines with crop clearances greater than 10 feet and in areas with nearby underground pipelines or high voltage power lines, enhancing detection accuracy and robustness against interference.
Implementation Method 1
a 5th order active high pass filter cascaded with a 5th order active low pass filter, configured to remove noise outside the 700 Hz to 1500 Hz frequency band
Implementation Method 2
a voltage amplifying circuit to amplify the filtered signal
Data Source
AI summary
The present invention provides a filter which is configured to filter frequencies created by noise outside of the band of interest and to then amplify the filtered signal to allow a weaker signal to be used for guidance. According to a first preferred embodiment, the filter of the present invention includes a 5th order active high pass filter cascaded with a 5th order active low pass filter. According to a further preferred embodiment, the filter of the present invention preferably provides a cutoff of frequencies below 700 Hz and above 1500 Hz. According to a further preferred embodiment, the filter of the present invention further uses a voltage amplifying circuit to amplify the filtered signal.