发明名称 |
Wavelet-based interference filtering for spread-spectrum signal |
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.
|
申请公布号 |
US6219373(B1) |
申请公布日期 |
2001.04.17 |
申请号 |
US19980106504 |
申请日期 |
1998.06.15 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY |
发明人 |
LEE DAVID A.;HANSEN GRANT A.;KUO WEI |
分类号 |
G06F17/14;(IPC1-7):A61F2/06 |
主分类号 |
G06F17/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|