Frequency estimation interpolation compensation method based on FFT
A technology of frequency estimation and interpolation compensation, which is applied in the field of aerospace measurement and control communication, can solve the problems that the correction value deviates from the initial frequency difference, affects the estimation accuracy, and affects the estimation accuracy, and achieves the effect of stable estimation performance, small estimation performance, and improved frequency estimation accuracy
Active Publication Date: 2020-11-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
However, in the case of low carrier-to-noise ratio, the conventional algorithm that uses phase information to estimate the interpolation direction still has the problem of low accuracy of interpolation direction estimation
In addition, the correction value calculated by using the spectral line amplitude is seriously affected by noise, which causes the calculated correction value to deviate greatly from the initial frequency difference, thus affecting the final estimation accuracy
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[0066] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0067] The invention provides a frequency estimation interpolation compensation method based on phase coefficient comparison and side lobe coefficient weighted correction. Based on the FFT-based frequency estimation method, this method uses the FFT coefficient to estimate the frequency difference correction coefficient to correct the initial frequency difference to achieve the purpose of improving the frequency estimation accuracy. The principle block diagram of the frequency estimation based on interpolation compensation is as follows: figure 1 shown.
[0068] Let the signal model be
[0069] x(n)=s(n)+w(n) (1.1)
[0070]
[0071] Among them, s(n) is a useful signal, n represents the sampling time after quantization, and w(n) is Gaussian noise. A is the signal amplitude, f 0 is the signal frequency, f s is the sampling frequency (the sampling freq...
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The invention provides a frequency estimation interpolation compensation method based on an FFT coefficient. The method uses phase information to estimate an interpolation direction, uses a sidelobe coefficient to carry out weighted correction on a correction value calculated by a main lobe coefficient, and uses a fuzzy controller to generate a weight factor. According to the method, the frequencyestimation precision is effectively improved under the condition that the carrier-to-noise ratio is low. Meanwhile, the estimation performance of the method is less affected by the initial frequencydifference, and the estimation performance is stable.
Description
technical field [0001] The invention belongs to the technical field of aerospace measurement and control communication, and in particular relates to an FFT-based frequency estimation interpolation compensation method. Background technique [0002] In the synchronization process of aerospace TT&C signals, frequency estimation technology is usually used to extract the carrier frequency. Due to the low signal-to-noise ratio of aerospace TT&C signals, the frequency estimation method based on FFT is often used to complete the frequency estimation. In the FFT-based frequency estimation algorithm, the frequency point corresponding to the FFT peak spectrum line is used as the frequency estimation value. If the actual frequency does not fall on the quantization frequency point, the FFT frequency resolution will have a great impact on the frequency estimation accuracy, which may cause The maximum estimation error is half the frequency resolution of the FFT. In this regard, the resol...
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IPC IPC(8): G06F17/14G06N5/04G05B13/02
CPCG06F17/142G06N5/048G05B13/0275
Inventor 史学森王永庆申宇瑶刘东磊陈岩
Owner BEIJING INSTITUTE OF TECHNOLOGYGY