A Variable-Frequency Narrow-Band Interference Suppression Method for HF Full-Band Reception

Abstract

The invention discloses a variable-frequency narrow-band interference suppression method for short-wave full-band reception. The input signal power is divided into two channels, and the full-band direct-sampling receiving branch and the broadband variable-frequency receiving branch are respectively used to receive and process the two input signals. The processing results of the two branches are input into the FPGA for fusion output; the invention realizes the short-wave full-frequency tunable narrow-band notch by combining the adjustable notch and the narrow-band notch technology, thereby realizing the suppression of the interference signal , has the characteristics of tunable notch frequency in the short-wave full frequency range, small notch bandwidth and large notch depth, and is easy to implement; the narrow-band crystal notch ensures the reception performance of the adjacent channel signal of the interference signal, and the frequency mixing The link cooperation enables the fixed frequency crystal notch filter to notch short-wave interference signals of any frequency, and through the data fusion in the FPGA, the narrow-band notch suppression of the interference signals is realized, and the interference signal removal is ensured. Good reception of shortwave signals outside the full frequency band.

Description

technical field [0001] The invention relates to the technical field of signal interference suppression, in particular to a variable-frequency narrow-band interference suppression method for shortwave full-band reception. Background technique [0002] With the development of communication equipment, the user's demand for shortwave full-band direct mining equipment is becoming more and more urgent. The biggest problem facing shortwave full-band signal reception is the problem of large signal interference, such as the interference signal formed by high-power shortwave radio stations, etc. The most serious problem is that in the shortwave communication system, because the transmitting antenna is relatively close to the receiving antenna, the transmitting signal is become a very strong interfering signal, which is called co-site interfering signal. The interference signal will cause the full-band receiver to receive signal energy greater than the maximum saturation level of the ...

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Problems solved by technology

A notch filter that can meet the two requirements of small notch bandwidth and full frequency band tunability is a high-performance notch filter with an ideal effect of suppressing interference signals, but the design of this kind of notch filter is very difficult, and there is no such a Suitable solution, therefore, the present invention proposes a kind of variable-frequency narrow-band interference suppression method for shortwave full-band reception to solve the problems existing in the prior art

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