摘要
在实验室进行杂波仿真时,需要产生高信噪比的调制在中频或射频的杂波信号。在该文中讨论了杂波信号产生的特殊性,包括两个方面:信号重构和调制。信号重构的过程包括将功率谱转换为矢量频谱,相位随机化,傅立叶反变换,最后加窗搭接以保证均值和方差连续。杂波调制采用数字正交调制的方法,在数字正交调制前需要对重构的基带数据进行内插扩展和低通滤波。通过应用上述措施,能够将附加噪声抑制到-60dB,满足主动雷达导引头半实物仿真的需要。
As clutter simulating in laboratory, it needs to generate the clutter signal modulated by immediate or radio frequency signal with high ratio of signal to noise. In the paper, the specific characters of clutter signal generation are discussed, which includes two parts: signal reconstruction and modulation. The procedure of signal reconstruction includes conversion from power spectrum to vector spectrum, randomization of phase, inverse Fourier transform, and then windowing and overlapping the series time domain sequence, which guarantees the average value and variance of random sequence continuously. The method of modulation is digital quadrature modulation (DQM) instead of liner quadrature modulation (LQM). Before DQM, interpolation extension and low-pass filtering are need. By applying these steps, it can refrain the noise resulted by reconstruction and modulation to 60dB to meet the requirement of active radar seeker-in-the-loop simulation.
出处
《系统仿真学报》
CAS
CSCD
2003年第4期476-478,共3页
Journal of System Simulation
基金
航空科学基金资助项目(00F12001)
