1) Time-frequency image ridge
时频图像脊
3) time-frequency distribution image
时频分布图像
1.
Study on intra-pulse modulation recognition method based on time-frequency distribution image and principal component analysis
基于时频分布图像和主分量分析的脉内调制识别算法研究
2.
The authors propose a new method with combination of time domain and frequency domain by using the time-frequency distribution image of the radar signal.
借助于雷达信号的时频分布图像,提出了一种在时频联合域上进行信号识别的新算法。
5) time-frequency ridge
时频脊点
1.
The signals are pre-sorted by time-frequency distribution, then the DOA is obtained by estimating the phase of the point along the time-frequency ridge.
通过时频分布 ,在时频面上进行信号预分选 ;根据XWVD时频脊点上的相位获得信号时延 ,从而获得信号到达角。
2.
With the frequency parameters, steering matrix is constructed on the point along the time-frequency ridge.
首先对参考阵元的输出作时频分析,估计信号的频率参数,从而选择时频脊点构造方向矩阵;然后对各阵元输出求互Wigner Ville分布(XWVD)以构造修正空间时频分布(STFD)矩阵;最后用修正STFD矩阵代替传统MUSIC算法中的协方差矩阵即可求得信号的时频———MUSIC空间谱,从而得到信号的DOA。
6) time-frequency backbone curve
时频脊线
1.
The FH signals with the short-time Fourier transform(STFT) is used to yield its time-frequency backbone curve,whose edge information is abstracted by the wavelet transform(WT),to which the FFT is applied — this is a known method to implement the hop rate accurate estimation when the SNR is high.
对跳频信号进行短时傅立叶变换,提取变换后的时频脊线,再利用小波变换提取该脊线的边沿信息,进而进行傅立叶变换,这是信噪比较高时已有的一种实现跳速精确估计的有效方法。
2.
They are used to yield accurate estimation for the hop frequencies and hop rate,which are fast 4th-order cyclic cumulants algorithm,time-frequency backbone curve analysis,and wavelet transform.
利用快速四阶循环累积量算法、时频脊线分析与小波变换相结合的方法,实现了跳频频率和码速率等参数的高精度估计。
补充资料：高光谱分辨率遥感图像及图像光谱信息提取
高光谱分辨率遥感图像及图像光谱信息提取
高光谱分辨率遥感图像及图像光谱信息提取 郑兰芬供稿
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条