利用多转发器直播卫星信号的外辐射源目标探测技术

根据某直播卫星实际信号的特点，分析了该直播卫星信号作为外辐射源的最大探测距离以及距离走动、频率扩散对目标探测的影响。通过实际信号的原理验证实验，进一步证明了该目标探测手段的可行性。提出了利用该直播卫星多路转发器信号实现相参积累的方法，并介绍了相参积累的原理。最后，利用对模糊函数的输出进行二维插值的方法，推导并仿真了相参积累的算法。仿真结果表明：利用该直播卫星信号作为外辐射源的7路转发器信号实现相参积累，检测信噪比可以提高8 dB。

Target detection technology based on signals of multiple transponders on broadcasting satellite

According to the characteristic of the real signal from a broadcasting satellite,the maximum detection distance and the influence of the walking range and spreading frequency on target detection are analyzed. The feasibility of the target detection method is proved by the real satellite signal experiment.The coherent accumulation algorithm based on signals of multiple transponders on broadcasting satellite is put forward. The principle of the coherent accumulation algorithm is introduced.Finally,the coherent accumulation algorithm based on two-dimension interpolation to the ambiguity is derived and simulated. The simulation results prove that the signal-to-noise ratio(SNR) can be improved 8 dB while achieving coherent accumulation by the signals of 7 multiple transponders.