公开(公告)号：US06219373B1

公开(公告)日：2001-04-17

申请号：US09106504

申请日：1998-06-15

申请人： David A. Lee ,  Grant A. Hansen ,  Wei Kuo

发明人： David A. Lee ,  Grant A. Hansen ,  Wei Kuo

IPC分类号： A61F206

CPC分类号： G06F17/148 ,  G01S19/21 ,  H04K3/228

摘要： Interference from a spread-spectrum signal (e.g., GPS) is filtered out utilizing a wavelet-based method. A wavelet packet decomposition scheme generates a first plurality of coefficient sets from the signal(s). An entropy measurement is determined for each resulting wavelet decomposition level. Portions of the spread-spectrum signal occurring above the noise floor for the wavelet decomposition level having the lowest entropy measurement are then filtered out so that a revised coefficient set is generated therefor. As a result, a second plurality of coefficient sets can be formed such that the first plurality of coefficient sets differs from the second plurality of coefficient sets only by the revised coefficient set. A new signal is formed by applying a wavelet packet reconstruction scheme to the second plurality of coefficient sets.

摘要翻译： 使用基于小波的方法来滤波来自扩频信号（例如，GPS）的干扰。 小波包分解方案从信号生成第一多个系数集合。 对于每个产生的小波分解级别确定熵测量。 对于具有最低熵测量的小波分解水平，出现在噪声本底之上的扩频信号的部分然后被滤除，从而为此生成修正的系数集。 结果，可以形成第二多个系数集合，使得第一多个系数集合仅与第二多个系数集合仅通过修改的系数集合而不同。 通过对第二多个系数组应用小波包重建方案来形成新的信号。