Current state of microwave radionavigation systems in underground structures

To improve the safety and productivity of underground enterprises, the deployment of positioning systems is currently required. Since underground structures such as mines, quarries, subway tunnels, collectors are not accessible to satellite navigation systems, local positioning technologies are used. The purpose of the article: to systematize and analyze modern research in the field of underground navigation of ultra-short waves and commercial solutions presented on the market. The result of the article is: microwave navigation methods are considered, and data on the claimed accuracy of distance determination in various sources is provided. The practical significance lies in the generalization and systematization of underground methods and positioning systems, which allows for the formation of approaches to their development and improvement.