基于频谱特征提取的轨道移频信号检测的兼容性设计与实现

Design and Implementation of Track Frequency Shift Signal Compatibility Detection Based on Spectral Feature Extraction

提出了一种基于频谱特征提取的轨道移频信号检测的兼容性算法，并在单芯片的微控制器STM32F405RGT6上利用该算法实现了对国产18信息移频信号和ZPW-2000移频信号的兼容性检测；通过综合分析两类移频信号的时频域特征，将过采样、ZFFT频谱细化、频率校正及频谱特征提取结合起来，通过两类不同的数字滤波器适应不同的算法设计需要，通过频谱特征提取实现不同频谱状态下的频率计算方式，有效地提高了频率的检测精度，拓展了调制频率的测量范围；实验结果证明，对国产18信息移频信号和zPw2000移频信号的中心频率、上下边频的检测误差不超过±0．1Hz，调制频率的检测误差小于±0．01Hz，在采样数据小于1S情况下，调制频率的测量范围可达到6～30Hz。

A track frequency--shift signal compatibility detection algorithm based on spectral feature extraction is presented, and the algorithm is realized on the single microcontroller STM32F405RGT6, which is compatible with domestic frequency- shift signal and ZPW-- 2000 frequency shift signal. Through comprehensively analyzing the time and frequency domain characteristics of two kinds of frequency-- shift signal, this paper combined oversampling, ZFFT, spectrum calibration and spectrum feature extraction as a whole, adopted two kinds of digital filter to adapt different algorithm design needs, used spectral feature extraction to achieve the frequency calculation of different spec tral condition, effectively improving frequency precision and expanding the module frequency detecting range. The test results showed that the central frequency and side frequency detection error is less than ±0. 1 Hz, modulate frequency error doesn＇ t exceed ±0.01 Hz, and the range of modulate frequency is between 6 Hz and 30 Hz when the length of sampling data is less than 1 second.