Since current studies on NGN mainly focus on passive defense, which has a certain limitation in such aspects as technique realization, the paper starts from a detailed analysis on security vulnerability of NGN, and then discussed possible attacks

被动测距仿真，调用相关函数求相关及最大值对应的位置，以及求两信号的相关，最大值对应的位置-Passive Ranging simulation, calls the correlation function related and corresponding to the maximum position, and to seek the correlation of the two signals, corresponding to the maximum position

无源定位的一些仿真代码，包括时TOA、TDOA、DOA、RSS。2维的线性、非线性、极大似然算法和克拉美罗下界、均方误差的代码-Passive targeting some simulation code, including when TOA, TDOA, DOA, RSS. Two-dimensional linear, nonlinear, maximum likelihood algorithm and Cramer-Rao lower bound, mean square error

计算被动调Q输出特性，光子数、反转粒子数分布等-caculated passive Q-switch