Читать книгу Pedestrian Inertial Navigation with Self-Contained Aiding - Doruk Senkal, Andrei M. Shkel - Страница 18

According to the property of the external signals, non‐self‐contained aiding techniques can be divided into two categories. In the case where the external signals are naturally existent, such as the Earth's magnetic field and the atmospheric pressure, no extra infrastructure is needed, but the signals may be subject to disturbance since their sources are not controlled. However, in the other case where man‐made signals are used, implementation of infrastructures is needed with the benefit that the signals are engineered to facilitate the navigation process.