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轨道移频信号检测需要具有相对较高的频率分辨率。在检测仪器内存和FFT计算长度有限制的情况下,为进一步获得较高的频率分辨率,则需对有用频段进行选频细化分析。文中将欠采样技术与ZOOM-FFT频谱细化技术相结合,用Matlab软件,对国产18信息轨道移频信号检测算法进行仿真验证,结果表明所提出的检测算法是可行的,并为轨道电路移频信号检测仪表的设计提供了方法依据。
Track frequency shift signal detection needs to have a relatively high frequency resolution. In the case of limited instrumentation memory and FFT calculation length, to further obtain higher frequency resolution, frequency selective refinement analysis of the useful frequency band is required. In this paper, the under-sampling technique is combined with the ZOOM-FFT spectrum refinement technique. The Matlab software is used to verify the detection algorithm of domestic 18 information track frequency-shift signals. The results show that the proposed detection algorithm is feasible, Frequency signal instrumentation design provides a basis for the method.