无源双基地雷达随机初相补偿及误差影响分析  

Phase compensation and error analysis for non-cooperative bistatic radar

作　　者：葛先军[1] 张财生[2] 宋杰[2] 丁昊[2] 何友[2] 

机构地区：[1]海军航空工程学院科研部,山东烟台264001 [2]海军航空工程学院信息融合技术研究所,山东烟台264001

出　　处：《系统工程与电子技术》2012年第10期2023-2027,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(61002045);总装"十一五"预研基金(51307010202)资助课题

摘　　要：分析了在无源双基地脉冲雷达中,利用从直达波信号中提取的初始相位来补偿目标散射回波随机初相的过程。指出了由于接收通道噪声和天线噪声的存在,从直达波参考信号中提取的初始相位是一个随机变量。为使相位补偿误差影响分析结果并不依赖于哪一种特定的相位同步方案,给出了相参积累过程的一般数学模型和相位补偿误差的概率密度函数,推导了系统互模糊函数处理后的峰值输出,定义了相参积累损耗以分析相位同步误差的影响,并根据数学模型数值分析了不同信噪比条件下的积累损耗。结果表明,当直达波信噪比为30dB时,相位补偿误差带来的信噪比损失约为0.3dB,而当直达波信噪比大于40dB时,相参积累损失可以近似忽略。Phase synchronization process in non-cooperative radar system achieved by the compensation of the prime phase via direct-path wave is analyzed. Since there is noise in the receiving channel and antenna, the prime phase of direct-path wave is stochastic. The effect of phase synchronization errors on coherent integration gain is explored for general application. The signal model and the probability density function of the phase syn- chronization error are presented for the purpose of coherent integration. Then, the analytical expression for the peak output of cross ambiguity processing is derived. The loss of integration is defined for the sake of evaluating the effect of phase synchronization errors. According to the mathematical model, the analysis in quantity is fur- ther conducted in different combinations of signal to noise ratio （SNR） between direct-path wave and the target echo. The simulation results show that the loss of integration will be 0.3 dB when the SNR of direct path wave is 30 dB. However, it will be very small when the SNR of direct-path wave is larger than 40 dB.

关 键 词：无源双基地雷达 相位补偿 相参积累 积累损耗 相位噪声 

分 类 号：TN958[电子电信—信号与信息处理]