宽带非平稳信号的瞬时频率测量方法

doi:10.3969/j.issn.1001-2400.2011.06.009

Abstract

Abstract:

An instantaneous frequency measurement method for broadband non-stationary signal is presented. The signal can be decomposed into progressive single-frequency signals by added qualification adaptive filters. According to their phase functions of analytical signals, the instantaneous frequencies are obtained. By integration of time-frequency relationship of all components, the instantaneous frequencies of broadband non-stationary signal are accurately measured. Simulation and error analysis prove that this method overcomes the difficulties in instantaneous frequency measuring of Fourier analysis, Wavelet transformation and Hilbert-Huang algorithm for the broadband non-stationary signal. In the whole analyzed frequency band it can achieve a higher frequency measurement resolution and has a measurement error of less than 0.2MHz for the signals with an SNR of above 0dB . For 8μs long signal, this method has a better real-time processing capability, but an initial operational delay of 25.816μs. Therefore, this method can meet the requirements of instantaneous frequency measurement for the broadband non-stationary signal.

Key words: broadband non-stationary signal, instantaneous frequency measurement, adaptive filtering, hilbert transformation, error analysis

CLC Number:

TN91

WANG Hai;FAN Wenjing;ZHANG Shengfeng. Instantaneous frequency measurement method for the broadband non-stationary signal[J].J4, 2011, 38(6): 55-61.

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Instantaneous frequency measurement method for the broadband non-stationary signal

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