track signal meaning in English
磁迹信号
Examples
- To guarantee the safety of running train on these lines , it is necessary to detect the parameters of the track signals precisely and timely
与此同时,行车安全日显严峻。为了确保该线路上的行车安全,要准确及时地检测出轨道信号参数。 - At the last we program the parameter detecting methods for frequency - shift track signal with c language and assembly language base on code composer studio of dsp . then we realize it on the dsp chip of tms320f2812 . experiments shows that it can satisfy the demand of real time and precision
最后在dsp的集成开发环境ccs ( codecomposerstudio )上采用c语言和汇编语言混合编写移频轨道信号的参数检测算法,并将该算法移植到dsp芯片( tms320f2812 )上实现,测试结果表明上述算法能够满足实时性和精度的要求。 - On the basis of the former research works , we present the detecting method as follows : for the narrow band characteristic of the track signal we use under - sampling instead of nyquist sampling to reduce the sampling rate . as to the carrier frequency , the spectrum of the 18 - information frequency - shift track signal has two peaks , then the carrier frequency is the average of the two peak frequency , to um - 71 jointless track signal , it has only one peak , then the carrier frequency is the peak frequency
针对移频轨道信号的窄带特性提出了使用欠采样技术代替奈奎斯特采样的方法,以降低信号的采样频率;国产18信息移频轨道信号频谱具有双峰,双峰频率平均值就是信号的载频频率,而um - 71无绝缘轨道信号频谱单峰,峰值频率即为信号的载频频率。 - Since the energy of 18 - information track signal is concentrated around upper frequency and lower frequency , the frequency of the modulation signal is low , and it must have high resolution , we use zfft to detect it . as the energy of um - 71 signal is more concentrated , we use extreme value method to detect the frequency of modulation signal in frequency domain , which can satisfy the frequency resolution
针对18信息轨道信号能量集中在上、下边频附近且低频信息频率低的情况,提出了用zoom - fft ( zoom指频率扩展或细化,简称zfft )算法进行信号的局部放大检测低频信息,以提高信号的频率分辨率,而um - 71轨道信号能量集中在载频附近,在频域上采用极值法检测低频信息,即可满足信号频率分辨率的要求。 - But it is not suitable for online implementation or for tracking signal components with characteristic that change with time , a new modified algorithm is present based on the adaptive short - time kernel . simulations show that adaptive short - time kernel time - frequency distribution has better performance than anyother time - frequency distribution not only in the time - frequency resolution but also in the cross - components suppression
通过对仿真信号计算其自适应短时高斯核时频分布，仿真结果表明，无论从改善信号的时频分辨率还是抑制交叉项方面，自适应短时核时频分布均表现出了较好的特性。