My senior capstone project was the development of a tag-based subharmonic radar tracking system.
Subharmonic radar is a relatively new technology; it was developed in a Northeastern lab in 2021. Here’s how this implementation works: It sends out a constant (f = 2.6 GHz) frequency from an antenna on a base station. A miniature, passive tag receives the signal, generates a subharmonic (f/2 = 1.3 GHz), and transmits that signal back to the base station. The base station receives it and calculates the distance from and the direction towards the tag.
These tags have many use cases; one implementation of harmonic radar (similar to subharmonic radar, but the tags generate a higher harmonic) attached miniature tags to invasive species of insects to track them to back to their nest and eliminate them. Other uses could be avalanche rescue or inventory tracking and management in warehouses.
Here is the whitepaper for our project.
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