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Amplitude-modulated signal detection method and device

A technology of amplitude modulation signal and detection method, which is applied in the direction of amplitude modulation carrier system, modulation carrier system, digital transmission system, etc. Effect

Active Publication Date: 2020-03-31
武汉船舶通信研究所
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  • Claims
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Problems solved by technology

[0004] In the process of realizing the present disclosure, the inventors found that the related technology has at least the following problems: when the frequency of the amplitude modulation signal deviates from the Fourier reference frequency, the calculated signal-to-noise ratio is inaccurate, which reduces the accuracy of detection

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Embodiment Construction

[0058] In order to make the purpose, technical solution and advantages of the present disclosure clearer, the implementation manners of the present disclosure will be further described in detail below in conjunction with the accompanying drawings.

[0059] figure 1 It is a flowchart of a method for detecting an amplitude modulation signal provided by an embodiment of the present disclosure. see figure 1 , the flow of the method for detecting the amplitude modulation signal includes the following steps.

[0060] Step 101. In the current sampling period, sample the signal to be tested to obtain sampled data, where the sampled data includes N sampling points. N is a positive integer, such as 2048.

[0061]Step 102 , performing discrete fast Fourier transform (DFFT for short) on the sampled data to obtain a first sequence X(k).

[0062] The number of transformation points of DFFT can be m, 2 m >N, m≥k≥1. Preferably, m can satisfy 2 m >Minimum value of N.

[0063] Step 103,...

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Abstract

The invention provides an amplitude-modulated signal detection method and device, and belongs to the field of signal detection. The method comprises the steps of in a current sampling period, samplinga signal to be measured to obtain sampling data, wherein the sampling data comprises N sampling points; carrying out discrete fast Fourier transform (DFFT) on the sampling data to obtain a first sequence X (k); determining the offset of the frequency of the signal to be measured to the Fourier reference frequency based on the first sequence; correcting the sampling data based on the offset to obtain a second sequence; determining a signal-to-noise ratio of the signal to be measured based on the second sequence; and based on the signal-to-noise ratio, determining whether the to-be-measured signal in the current sampling period is an amplitude modulation signal. The amplitude modulation signal detection accuracy can be improved.

Description

technical field [0001] The present disclosure relates to the field of signal detection, in particular to a method and device for detecting an amplitude modulation signal. Background technique [0002] Amplitude modulation is a modulation method that makes the amplitude of the carrier wave change according to the changing law of the signal to be transmitted, but keeps the frequency constant. The carrier signal processed by amplitude modulation is the amplitude modulation signal. [0003] When receiving the AM signal, the AM signal needs to be detected. In related technologies, the detection method of the amplitude modulation signal includes: first converting the signal to be tested from the time domain to the frequency domain through Fourier transform, then calculating the signal-to-noise ratio of the signal to be tested based on the signal to be tested in the frequency domain, and then calculating the signal-to-noise ratio based on the signal to be measured The noise ratio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/06H04L27/26
CPCH04L27/06H04L27/2657H04L27/2688
Inventor 吴志兵游行远彭军伟王纪东刘慧詹鹏熊英刘雄丁昊成徐彬彬向雯黄钟刘四超张步陈龙朱明杨世钦张鸿禹刘晓玲付睿
Owner 武汉船舶通信研究所
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