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Variable-frequency narrow-band interference suppression method for short-wave full-band receiving

A narrow-band interference, full-band technology, applied in the field of variable-frequency narrow-band interference suppression, can solve problems such as the difficulty of notch filter design, and achieve the effect of narrow-band notch suppression, large notch depth, and easy implementation.

Active Publication Date: 2021-01-26
成都星象科技有限公司
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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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  • Variable-frequency narrow-band interference suppression method for short-wave full-band receiving
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  • Variable-frequency narrow-band interference suppression method for short-wave full-band receiving

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Embodiment

[0028] according to image 3 As shown in , it is assumed that the antenna signal input to the receiver contains a large-amplitude interference signal and many small signals that fill the entire frequency band. In order to demonstrate the influence of the notch on the signal amplitude during processing, it is assumed that the amplitudes of these small signals are all Same, only 20dB above the noise floor.

[0029] The signal power is divided into two channels, one of which is connected to the full-band direct sampling receiving branch with a variable notch filter, and the full-band signal reception is completed after the interference signal is notched by the variable notch filter. From image 3 It can be seen from the figure that the amplitude of some channel signals is reduced due to the "wrong notch" of the interference signal adjacent to the channel by the variable notch filter, and some channel signals do not have enough signal-to-noise ratio to ensure correct reception an...

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Abstract

The invention discloses a variable-frequency narrow-band interference suppression method for short-wave full-band receiving. The method comprises steps of dividing an input signal into two paths, respectively employing a full-band direct collection receiving branch and a broadband variable-frequency receiving branch to receive and process the two paths of input signals, and inputting the processing results of the two branches into an FPGA for fusion output; according to the invention, the tunable narrow-band notch of the short-wave full-band is realized through a method of combining the adjustable notch technology and the narrow-band notch technology, so that the suppression of interference signals is realized, and the filter has the characteristics of tunable notch frequency in the short-wave full-band range, small notch bandwidth and large notch depth, and is easy to realize; receiving performance of an interference signal close to a channel signal is guaranteed through narrowband crystal notch, the crystal notch filter with fixed frequency can notch a short-wave interference signal with any frequency through cooperation with a frequency mixing link, and narrowband notch suppression of the interference signal is achieved through data fusion in an FPGA; and good receiving of full-band short-wave signals except interference signals is ensured.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10
CPCH04B1/1036H04B2001/1063
Inventor 应文俊李梅
Owner 成都星象科技有限公司
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