Experimental research of maximum achievable parameters of secret radio channel for moving objects control in multipath environment

Abstract

In this paper, maximum attainable parameters of a low-speed radio channel for moving objects control: data transfer rate, range, stealth in a multipath environment are investigated. The level of secrecy about -40 dB at distances up to 100 km at a bit error rate of 10-6 is achieved for the DQPSK modulation and Reed-Solomon code (63,32,6). In this case the power of the transmitter is 10 dBm and bitrate is 1000 bps. Spectrum spreading is implemented by a method based on two M-sequences. Attainability of the declared parameters is confirmed experimentally at HIL-system and in full-scale tests with unmanned aircraft. In full-scale tests of an experimental sample, a series of studies were developed for choosing the most effective antenna devices, with the marginal performance for transmitter and receiver located on the ground, and for a transmitter located on board. A series of studies of the experimental sample on specialized equipment approving the required parameters for stealth were performed. Established landfill equipment has recorded signals at distances not exceeding 1000 m.