现在国内也有非线性节点探测器了，技术还不错，可以看看。http://wenku.baidu.com/link?url=6AmLNte1di-sNhVFyNducxpfEO-OYXQOmPUM-5r1XdvRKSNIinbqf473xybGy2Hy_6wWR1BR-YIFs0AV1KW1s8blsy6OkrZ78E5s8UxXnQ_
