Local navigation system for VTOLs used on the vessels

Modern warships are often equipped with small airstrips that are dedicated to helicopters or other vertical take-off and landing (VTOL) units. Therefore, this type of vessels should have navigation systems that provide process automation of take-off and landing for these flying units. Currently, the Global Navigation Satellite Systems (GNSS) is used for this purpose. The accuracy of the positioning based on GNSS may prove to be insufficient during automatic landing approach of unmanned aerial vehicles. In the military operation area, GNSS signals may be jamming or spoofing. Additionally, it may be limiting visibility related to smoke screens or natural factors, e.g. fog. Thus, there is a need for a dedicated radio navigation systems. This paper presents a concept of the local navigation system (LNS) that based on the signal Doppler frequency (SDF) location method. LNS allows positioning of the landing VTOL with high precision. The accuracy of VTOL positioning in LNS is shown on the basis of two scenarios of simulation studies.

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