Abstract <p>Experimental research has been conducted on deliberate interference in GNSS signals by the retransmitted radio frequency interference of the meaconing type. In an experimental setup, GPS, GLONASS, Galileo, and BeiDou signals were received and processed across four frequency bands. Radio frequency interference (RFI) is relayed from a separate antenna and fed to the receiver input via a microwave adder. A microwave amplifier and attenuator control the power of the interference. Regular satellite signals also reach the receiver input via a microwave adder. It has been shown that this procedure is equivalent to feeding both regular signals and radio-frequency interference to the receiver via a single antenna. Measurement results have shown that in a GNSS system containing GPS, GLONASS, Galileo, and BeiDou operating in all frequency bands, when smoothly entering the RFI zone of the meaconing type, signs of deliberate interference in regular satellite signals may be sudden changes in the position, signal-to-noise ratio, root mean square deviation of phase and code pseudoranges, and the difference between phase and code pseudoranges.</p>