Subsonic recognizing and suppressing system and recognition method thereof

Abstract

The invention provides a subsonic recognizing and suppressing system and a recognition method thereof. The subsonic recognizing and suppressing system comprises a terminal control center, a monitoring receiver, a subsonic recognizing module, a baseband signal source, a radio frequency exciter, a power amplifier and an antenna, wherein the terminal control center generates digital interference signal data, outputs to the baseband signal source to be processed and then generates modulated intermediate-frequency jamming signals, and the intermediate-frequency jamming signals are converted to required frequency bands by the radio frequency exciter and are amplified by the power amplifier and radiated to a target interference area by the antenna. A sound suppressing module comprises a demodulation module, a band-pass filter module, a digital subsonic recognizing module and a simulative subsonic recognizing module. According to the specific application, either the simulative subsonic recognizing module or the digital subsonic recognizing module is selected. Accordingly, the problem that illegal signals transmitted by equipment with the subsonic function cannot be effectively suppressed by a conventional suppressing system with the subsonic recognizing function in radio monitoring is avoided, and operation needs can be adapted better and met.

Description

technical field [0001] The invention relates to the radio field, in particular to a subsound identification and suppression system and identification method thereof. Background technique [0002] In signal analysis, we often decompose the signal into vector, that is, decompose the signal into two components with the same frequency and the same peak amplitude but with a phase difference of 90 degrees. The modulation expression method of the polar coordinate mode can be transformed into a rectangular coordinate mode, which is the I-Q diagram. The carrier amplitude and phase can be recorded as a point in two-dimensional space, and the projection of the vector represented by this point on the horizontal and vertical axes are I value and Q value respectively. I is the same phase (In-phase) component, representing the projection of the vector on the horizontal axis; Q is the 90-degree phase shift (Quadrate) component, representing the projection of the vector on the vertical axis...

AI Technical Summary

Problems solved by technology

[0004] In the radio monitoring work, the conventional suppression system does not have the subsound recognition function. If the illegal signal is transmitted by the device with the subsonic function, the illegal signal cannot be effectively suppressed, so that it cannot fully meet and adapt to the needs of the work.

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