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Anti-frequency-offset DMR interphone signal rapid identification method

An identification method and walkie-talkie technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve problems such as performance degradation and frequency deviation, and achieve the effect of simplifying hardware design, reducing software complexity, and reducing accuracy requirements

Pending Publication Date: 2021-05-28
南京中新赛克科技有限责任公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

Because the center frequency point estimation often has a frequency deviation, and the performance of the synchronization correlation detection of the DMR signal is seriously degraded when the frequency deviation is greater than 1Khz

Method used

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  • Anti-frequency-offset DMR interphone signal rapid identification method
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  • Anti-frequency-offset DMR interphone signal rapid identification method

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Embodiment Construction

[0030] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0031] Such as Figure 1-4 As shown, take the communication of time slot 1 in the direct mode of the DMR walkie-talkie working at 409.7625MHz as an example to illustrate:

[0032] Step 1. Perform 500MHz bandwidth monitoring on the wireless environment;

[0033] Step 2. Once a suspicious signal is found in the DMR walkie-talkie frequency band, reduce the monitoring bandwidth to 25MHz, and estimate the signal bandwidth to be 9.85Khz;

[0034] Step 3. The bandwidth of the signal conforms to the spe...

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PUM

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Abstract

The invention discloses an anti-frequency offset DMR interphone signal rapid identification method, which comprises the following steps: after monitoring and finding out a suspected signal of a DMR interphone, carrying out integer multiple and decimal multiple extraction on baseband data, carrying out root raised cosine filter, FM demodulator and frequency offset component pre-compensation, and carrying out normalized correlation on a plurality of locally reserved voice synchronization signals; and finally, judging whether the signal is a DMR interphone signal or not through a threshold. According to the method, the receiving range of the equipment to the signal frequency offset is enhanced, and the identification probability of the DMR interphone is improved. The method solves the problem that the DMR detection probability is reduced when the frequency offset exists, and is suitable for the field of wireless communication.

Description

technical field [0001] The invention belongs to the technical field of signal detection, and in particular relates to an anti-frequency offset DMR walkie-talkie signal fast identification method. Background technique [0002] When the wireless monitoring equipment scans the frequency band of the walkie-talkie, if it finds a suspicious wireless signal, it will perform a fine spectrum analysis to further clarify the bandwidth and center frequency of the signal. Since the center frequency point estimation often has a frequency deviation, and the performance of the synchronous correlation detection of the DMR signal is seriously degraded when the frequency deviation is greater than 1Khz. Contents of the invention [0003] Purpose of the invention: In view of the above defects, the present invention provides a fast frequency-offset-resistant DMR walkie-talkie signal identification method, which improves the success rate of monitoring equipment in identifying DMR walkie-talkie s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B1/3827
CPCH04B17/00H04B1/3827
Inventor 张新硕
Owner 南京中新赛克科技有限责任公司
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