Online electromagnetic environment monitoring device and method based on radio fingerprint identification

Abstract

The invention relates to an online electromagnetic environment monitoring device and method based on radio fingerprint identification, and the method comprises the steps: collecting an electromagneticwave in a target frequency band, converting the electromagnetic wave into a digital signal, obtaining an effective sample signal, and obtaining the feature parameters of the sample signal after the time-frequency domain conversion and spectrum analysis are completed; comparing and judging according to the frequency database, if the same-frequency interference of the authorized frequency band is judged, extracting a radio fingerprint from the sample signal through a radio fingerprint identification algorithm, and further comparing and analyzing the radio fingerprint with a radio fingerprint database module to obtain a result; and performing interference degree analysis on the preliminary result of interference identification in combination with conditions of same-frequency interference protection and adjacent-frequency interference protection corresponding to the authorized frequency point signal system to obtain a monitoring result. The invention can continuously and dynamically monitor the electromagnetic environment, without depending on signal demodulation and can achieve the simultaneous monitoring of multi-band and multi-system signals, and precisely recognize the same-frequency interference through a radio fingerprint algorithm.

Description

technical field [0001] The invention relates to the technical field of urban rail transit and high-speed railway monitoring, in particular to an online electromagnetic environment monitoring device and method based on radio fingerprint identification. Background technique [0002] At present, the domestic urban rail transit industry is developing rapidly, and the network scale and operating mileage are constantly expanding. The total operating mileage of domestic high-speed railways has reached 35,000 kilometers. The reliable operation and communication quality of wireless communication systems such as wireless dispatching and wireless train control in high-speed railways and rail transit systems are crucial factors that affect the efficiency and stability of subway and high-speed rail operations and ensure the safety of passengers. However, with various wireless communication systems The operating environment of the above-mentioned system is always faced with the threat of ...

AI Technical Summary

Problems solved by technology

However, the electromagnetic environment test in the traditional sense has many disadvantages

First of all, the traditional test is a discrete and transient test. It only organizes testers and simple equipment to conduct a transient test for a specific time and place. It cannot continuously, comprehensively and dynamically monitor the whole process. The test results are only Responsible for the sampling values ​​of this test, in the later stage of operation, it is impossible to monitor and identify the interference generated by randomly generated external unauthorized base stations and terminals in real time; secondly, the data collection and interference analysis processes are separated, and the conclusions mostly rely on human analysis. The measurement accuracy is closely related to the level and rigor of the testers; thirdly, except for a few standard signals that can be tested by demodulating the signal to analyze the content, signals in other frequency bands need to use a basic spectrum analyzer, which requires a higher level of tester's professional ability. high

Fourth, it is difficult to identify the same-frequency interference signal manually, and it is necessary to cooperate with the railway base station switch operation to eliminate interference. The detection requires a lot of cooperation, and it is difficult to carry out

[0005] If the identification of co-channel interference is realized by means of demodulation, the monitoring equipment must be equipped with radio frequency and baseband equipment in the corresponding frequency band. It will be huge, and it will be very expensive

For the same-frequency interference identification scheme realized by digital phosphor spectrum display technology, it is essentially required that the interference signal and the useful signal do not completely overlap in the time domain, and there are also restrictions on the strength of the interference signal. Low-energy signals at the same time and frequency cannot identify

The two schemes are very limited in practical application, and there are still serious monitoring loopholes

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