Drone Aircraft Control Efficiency under Interference
Keywords:
Local Radio Navigation System, Active Interference, Spatial FrequencyAbstract
Purpose: The main way to improve the noise immunity of satellite navigation systems is their reservation via local navigation
systems based on pseudosatellites. Typical artificial interferences to radio navigation systems are active noise interference and Doppler
interference. To improve the aircraft positioning accuracy, a combined method can be used of spatiotemporal and spatial-frequency
processing of the navigation signals. Methods: The method increases the level of complex phase-code-manipulated signals received
from the local navigation system on the background of artificial interference. It applies algorithms used in pulse-Doppler radars. They
are based on using differences in the spectra of signals from the sources which are moving with different radial speeds relatively to the
aircraft. Results: We have identified options for constructing a local navigation system for aircraft control under interference. The
accuracy of positioning is not inferior to the accuracy of the binding when using satellite navigation systems. An adaptive antenna array in the onboard navigation complex weakens the influence of the active noise interference. Adaptive Doppler filtering and compression of the complex signal can increase the signal/noise ratio by 35–50 dB. The result is a stable maintenance of the navigation signal when exposed to active noise interference with the capacity up to 100 watts. The probabilities of aircraft delivery in a given area are by 10–15% higher than the current ones due to the reduction of fluctuation errors by 20–30%.