Monitoring apparatus and method for satellite forwarding device interference signal

Abstract

The present invention relates to a monitoring method of interfering signal of satellite transponder and a monitor thereof. The monitoring method adjusts the useful signal in input signal to consistent with the initial time, frequency and amplitude of local signal through adjusting the initial time, frequency and amplitude of input signal. The adjusted signal is subtracted with the local signal for counteracting the useful signal and obtaining the interfering signal. The parameter and change regularity of interfering signal are analyzed through directly analyzing the characteristic of interfering signal for obtaining the purposes of pre-amplifying the transmitter power when malicious interference exists and in-time reducing the transmitter power when the malicious interference is eliminated. The monitor of the invention comprises five modules of a time delay catching module, a time delay tracking module, a frequency deviation correcting module, a gain adjusting module and a signal counteracting module.

Description

technical field [0001] The invention relates to the field of satellite digital television broadcasting, in particular to a satellite transponder interference signal monitoring device and a monitoring method. Background technique [0002] Satellite TV signals are very vulnerable to unforeseen unintentional or malicious interference due to their open wireless transmission. In recent years, due to well-known reasons, the interference of satellite TV signals has attracted widespread attention and great attention. Therefore, it is of great significance to analyze the interference phenomena and effects of satellite TV signals and to discuss how to effectively monitor and prevent interference. [0003] Most of my country's satellite TV signals have adopted the digital transmission technology of DVB-S standard. According to the actual operation situation, the interference caused to DVB-S signal reception can be summarized into two situations: one is irresistible natural interferenc...

AI Technical Summary

Problems solved by technology

[0004] At this stage, most of the interferences that cause serious consequences and adverse effects on the normal broadcasting of my country's satellite TV are broadband man-made malicious interferences.

Broadband man-made malicious interference is extremely concealed, and it is difficult to detect changes in indicators such as spectrum, channel power, and carrier-to-noise ratio

At present, the traditional monitoring method is to conduct real-time monitoring of the spectrum, carrier level, carrier-to-noise ratio, bit error rate and other indicators of the satellite downlink signal through the ground station, but in this way, the parameters and changing rules of the interference signal cannot be known, and often cannot be achieved Early response and accurate analysis bring a lot of passiveness to the work

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