Modulation mode identification method based on all-digital receiver

A modulation method identification and all-digital receiver technology, applied in the field of modulation method identification based on an all-digital receiver, can solve the problems of large calculation amount of identification algorithm, poor real-time online analysis of signals, large amount of calculation, etc., and achieves easy hardware implementation. , high practical significance, simple calculation effect

Active Publication Date: 2019-08-09
杭州天智融通科技有限公司
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Problems solved by technology

These two methods have a large amount of calculation, the calculation process of parameter extraction is difficult, and the real-time online analysis of signals is poor, so it is difficult to apply in actual engineering projects.
[0004] Based on the above analysis, it can be seen that the current modulation identificati

Method used

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  • Modulation mode identification method based on all-digital receiver
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  • Modulation mode identification method based on all-digital receiver

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Embodiment

[0080] The signals are modulated signals sent by China Electronics Technology Group Corporation using Agilent E4438C, and AM_FM, MTONE_FM, and FSK signals are collected by an AD sampling board with a sampling frequency of 200M. The bandwidth of the FSK signal is 6.4MHz, and the bandwidth of the AM_FM and MTONE_FM signals is 200kHz.

[0081] Firstly, the input signal is transformed by FFT to obtain the spectrum diagram of the signal, the carrier frequency of the signal is estimated and the 3dB bandwidth is found, and the narrowband and broadband signals are distinguished. Next, the estimated carrier frequency is used as the down-conversion frequency to complete the down-conversion, CIC extraction and low-pass filtering. If it is a narrowband signal, the sampling frequency needs to be decimated by CIC500 times to reduce the sampling rate and sent to the carrier synchronization loop. If the broadband signal needs to be extracted twice by CIC, it is sent to the carrier synchroniza...

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Abstract

The invention discloses a modulation mode identification method based on an all-digital receiver. The method comprises the following steps: 1, carrying out FFT (Fast Fourier Transform) on a measurement and control signal received by receiving equipment, and estimating a carrier frequency and a 3dB bandwidth; 2, completing down-conversion, filtering and resampling by using the estimated carrier frequency; 3, tracking the frequency offset of the orthogonally decomposed low-frequency signal through a phase-locked loop, and distinguishing an FSK signal and AM _ FM and MTONE _ FM signals by using afrequency tracking curve; and 4, carrying out FFT conversion on the frequency tracking curve containing the modulation information to identify AM _ FM and MTONE _ FM signals. The method has the advantages of being simple in calculation amount and easy to achieve in hardware. According to the method, the FSK signal and the composite modulated narrow-band FM signal can be accurately judged in the full-digital receiver, and the recognition accuracy is better than that of a traditional signal instantaneous spectrum recognition method.

Description

technical field [0001] The invention is mainly aimed at signal detection and frequency estimation, and mainly relates to a modulation mode identification method based on an all-digital receiver. Background technique [0002] In the actual electronic reconnaissance environment, the transmitted signal is often accompanied by a mixture of wideband digital modulation signal and narrowband signal, which requires research on the modulation method identification of the received communication signal. And in the case that the various parameters of the signal (signal bandwidth, modulation mode) are unknown, it makes the signal reconnaissance and identification more difficult. [0003] The currently used modulation method identification methods mainly include the identification method research based on signal cyclic spectrum, the identification method research based on signal high-order cumulant, the identification method based on signal constellation diagram, and the identification me...

Claims

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Application Information

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IPC IPC(8): H04L27/00
CPCH04L27/0012
Inventor 沈雷周盼赵永宽
Owner 杭州天智融通科技有限公司
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