Interference signal processing method and device based on adaptive filter

Abstract

An interference signal processing method based on an adaptive filter comprises the following steps: acquiring an astronomical observation signal and an interference reference signal, and performing signal synchronization; carrying out delay processing on the astronomical observation signal; dividing an interference reference signal corresponding to an astronomical observation signal into two paths, and carrying out delay processing on one path of interference reference signal; inputting the other path of interference reference signal into the adaptive filter for digital filtering subtracting the interference reference signal after digital filtering from the astronomical observation signal after delay processing to obtain a corresponding output signal; inputting the output signal and the interference reference signal after delay processing into a lag correlator for cross-correlation operation; integrating the output signal; updating the filter coefficient according to the average value of the integrals; and repeating the steps for each sampling output of the observation signal to obtain all sampling data of the output signal. The interference processing performance of the observation system can be improved, the loss of the observation signal bandwidth is avoided, the complex radio frequency interference is effectively inhibited, and the signal quality and the recognition rate are improved.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to an interference signal processing method and device based on an adaptive filter. Background technique [0002] Due to the large receiving area and high antenna gain of the radio telescope, the sensitivity far exceeds that of ordinary communication equipment. Even if the radio telescope is built in a relatively remote area with relatively small radio interference, it will still be interfered by other signals, making the radio telescope While receiving useful astronomical information, it will also receive man-made radio frequency interference (Radio Frequency Interferences, RFI), such as TV signals, FM radio transmissions, global positioning system (GPS), mobile phones and aircraft navigation communications and other interference signals. These interference signals are the main factors affecting the sensitivity and data quality of astronomical observation equipment, which can lead ...

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Problems solved by technology

[0004] (1) The existing interference signal elimination methods have low efficiency and poor flexibility. With the improvement of the observation performance of radio telescopes, the frequency range of observable celestial body signals continues to expand, resulting in an increase in the observation bandwidth and the amount of data generated. As a result, the existing interference signal processing methods have been unable to meet the high-speed real-time processing requirements of massive observation data.

[0005] (2) The existing interference signal elimination methods have poor suppression performance for complex and strong interference signals. For example, interference signals such as 4G signals and TV signals are often mixed with pulsar signals, which is difficult to process, which may lead to loss or partial loss of data bandwidth. The loss of pulsar data reduces the signal-to-noise ratio of pulsar signals, making it impossible to provide scientists with reliable pulsar observation data

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