# An improved PDR system with accurate heading and step length estimation using handheld smartphone

> Research article (Journal of Navigation, 2021) · cited 27× · AI/ML

**Wikidata**: [openalex:W3187771690](https://www.wikidata.org/wiki/openalex:W3187771690)  
**Source**: https://4ort.xyz/entity/an-improved-pdr-system-with-accurate-heading-and-step-length-estimation-using-handheld-smartphone