基于DCT的轨道移频信号压缩与重构方法

A Method for Compression and Reconstruction of DCT-based Track Frequency Shift Signal

针对基于DCT变换对以轨道电路为传输媒介的轨道移频信号(FSK信号)进行采样压缩与重构的方法进行研究。根据移频信号频带特点保留对应频带数据,对频域系数进行压缩采样,采用DCT算法压缩信号,解码端应用重采样与DCT反变换还原信号,应用ZFFT算法对重构的轨道移频信号进行频率检测。MATLAB仿真实验结果表明:该方法压缩效率高,更节省压缩计算与存储空间,频谱分辨率高,重构误差小。

Studies are made for the sampling compression and reconstruction of track frequency signal(FSK signal)with track circuit as the transmission media based on DCT transform.According to the frequency band characteristics of the frequency shift signal,the corresponding frequency band data is maintained for compression and sampling of frequency domain coefficient.Signal is compressed by use of DCT algorithm,and the signal is restored by application of resampling and DCT inverse transform at the decoding end.Frequency inspection is made for reconstructed track frequency shift signal by application of ZFFT algorithm.The MATLAB simulation experiment results show that the method has high compression efficiency,saves compression computation and storage space,with high spectral resolution rate and minor reconstruction error.