1) 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。
2) 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。
3) ridge frequency
脊线频率
1.
Then,para-meters for the ridge frequency calculation are determined according to the fingerprint sensors.
基于G abor滤波器的低质指纹增强技术,对区域掩模及脊线频率的计算进行了改进。
4) Time-frequency image ridge
时频图像脊
5) local ridge frequency
局部脊线频率
1.
Then,the gray projection on the local orthogonal axis was used for estimating the local ridge frequency.
首先利用图像的局部灰度分布特点计算局部方向角;然后利用局部正交方向轴线上的灰度投影量估计局部脊线频率;最后利用自适应的具有方向选择和频率选择的Gabor滤波器对原图像进行滤波增强。
6) time-frequency curve
时频曲线
补充资料：脊线
脊线
edge of regression
脊线汇吨母Of任gI妞..;ao3opara衅6p哎，}，回归棱 一种由流形到E侧为d空间的可微映射的奇异性(51叩山rity ofd迁rerentinblerr以Ppm罗).在由曲面M到三维Euclid空间尸的映射f这一最简单情形，脊线指的是M中的一条光滑曲线L，具有光滑象f(L)C公，使对任何p任f(L)，M与过p且垂直于f(L)的平面7r的交是一尖点(拙p).脊线出现于伪球面中. M.H.Bo认够xo.c盆，认撰【补注】亦见可展曲面(山代响阶比s侧知卯)的脊线· 脊线也称为尖棱(那p浏初罗).它是AJ型稳定焦散线(以璐tic)，见「All，331页.
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