Abstract
The development of radio navigation systems began with the invention of radio direction finding apparatus in the early twentieth century, when moving objects, including ships and then aircraft, were able to receive the direction of motion to the nondirectional radio beacons. These stations (radio beacons) were usually installed in the area of final points of movement and were, in fact, analogs of optical beacons, but with a larger range of operation and less dependence on weather conditions. Then, closer to the middle of the twentieth century, there were automatic radio compasses. In parallel with the development of radio technic, engineering thought continued to create new radio navigation systems (RNS) and develop new principles for determining the parameters of the state of moving objects in space.
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