Abstract
The Direct Sequence Spread Spectrum technique represents an effective method for unmanned aerial vehicle (UAV) control signal protection. Signal protection is obtained by applying pseudorandom (PR) sequences within a transmitter, known by a receiver, but unknown to an unauthorized user. In order to achieve reliable signal transmission, PR sequences ought to have good autocorrelation properties. If the signal transmission is realized by using several PR sequences, their crosscorrelation properties are of high importance as well. In this paper autocorrelation and crosscorrelation properties of PR sequences of length 255 are analyzed. Three most frequently used classes of PR sequences: linear maximum length, Gold and Kasami sequences are considered. An optimal set of PR sequences for UAV control signal protection is recommended.
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