# A Noise Tolerant Spread Spectrum Sound-Based Local Positioning System for Operating a Quadcopter in a Greenhouse

> Research article (Sensors, 2020) · cited 13× · AI/ML

**Wikidata**: [openalex:W3014229381](https://www.wikidata.org/wiki/openalex:W3014229381)  
**Source**: https://4ort.xyz/entity/a-noise-tolerant-spread-spectrum-sound-based-local-positioning-system-for-operating-a-quadcopter-in-a-greenhouse