Large area ground monitoring
A municipal infrastructure maintenance system uses a ground vehicle to move an antenna array in back-and-forth sweeps over large areas or distances. The antenna array comprises dozens of compartmentalized radio dipole antennas arranged laterally, shoulder-to-shoulder across the width of each sweep. An antenna switch matrix is connected between the antenna array and a ground-penetrating-radar (GPR) set and provides electronic aperture switching and selection, and the ability to laterally register one sweep to the next. The antenna array is extended out in front of the ground vehicle on a pivotable boom, and the cantilevered weight is a primary concern. The antenna array is constructed with aluminum-on-aluminum honeycomb panels slotted and folded around dozens of resistive-card compartment separators. Printed circuit boards with matching baluns are also slotted to receive tabs on the resistive cards, and their dipole elements are resistive loaded to quench crosstalk and near field effects.
1. A municipal infrastructure maintenance system that depends on a ground vehicle to move over large areas or distances, comprising:
an antenna array comprising dozens of compartments of radio dipole antennas arranged laterally, shoulder-to-shoulder across its width;
a number of resistive cards arranged in parallel and as compartment separators between each of said compartmentalized radio dipole antennas;
an aluminum-on-aluminum honeycomb panel laterally scored to be folded around front, top, and back edges of all the resistive cards and interlock with them using slots in the panel and tabs on the respective edges of the resistive cards;
a printed circuit board (PCB) on which said compartmentalized radio dipole antennas are disposed and positioned to close the bottom end of each compartment; and
a rigid foam filling disposed inside and encapsulating each said compartment;
wherein said ground vehicle is configured to carry the antenna array for operation as a ground penetrating radar.
2. The municipal infrastructure maintenance system of claim 1 , further comprising:
an antenna switch matrix connected between the antenna array and a ground-penetrating-radar (GPR) set and configured to provide electronic aperture switching and selection, and the ability to laterally register one sweep to the next.
3. The municipal infrastructure maintenance system of claim 1 , further comprising:
a cantilever boom arranged to attach to said vehicle and to extend the antenna array out in front on a pivotable boom.
4. The municipal infrastructure maintenance system of claim 1 , further comprising:
aluminum end caps to fit the opposite ends of the antenna array and to electrically close it;
a ferrite tile disposed inside each aluminum end cap to match the loading effects of a resistive card in a compartment; and
a phenolic fiberglass panel epoxied over the ferrite tiles to stabilize and support them in rough service.
5. The municipal infrastructure maintenance system of claim 1 , further comprising:
any brackets, braces, or reinforcements disposed inside any of the compartments are comprised of phenolic fiberglass and epoxy materials.
6. The municipal infrastructure maintenance system of claim 1 , further comprising:
equally matched components and circuits amongst each and every compartment so as to eliminate artifacts caused by switch between dipole antennas.
7. The municipal infrastructure maintenance system of claim 1 , further comprising:
resistive loading between patch antenna elements configured to control and reduce near field effects caused by ground clutter.
8. The municipal infrastructure maintenance system of claim 1 , further comprising:
an advanced CCD processor employing processing techniques that compare and combine multiple sub-sets of all available scan data scans.
9. The municipal infrastructure maintenance system of claim 8 , further comprising:
an advanced CCD processor employing processing techniques that compare and combine multiple sub-sets of all available scan data scans that use machine learning classification techniques to identify target objects and clutter in the data scans.
10. The municipal infrastructure maintenance system of claim 9 , further comprising:
an advanced CCD processor employing processing techniques that compare and combine multiple sub-sets of all available scan data scans that used machine learning classification techniques to identify target objects and clutter in the data scans where the training of the machine classifier is achieved in an automated way.