Effect of interchannel mismatches upon adaptive array cancellation

R. Nitzberg
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引用次数: 2

Abstract

The author analyzes the effect of interchannel mismatch on adaptive array interference cancellation for an arbitrary number of channels and arbitrary bandwidth waveforms for a partially adaptive array used in a multiple sidelobe canceller (MSLC). A general equation giving the residue power as a function of the interchannel mismatch, the radar bandwidth, and the array parameters is derived. To aid in clarifying the dependence of cancellation on interchannel errors, a Taylor series expansion is obtained. It shows that the ratio of adapted power to the unadapted main power is greater than 1- mu (where mu is the average interchannel mismatch correlation coefficient) for all interferer locations and power levels and any number of auxiliary antennas. The special, simple-geometry case of narrowband orthogonal direction vectors is evaluated. For this case, the ratio of adapted to unadapted power is approximately equal to (1- mu )(1+K/N) for K interferers and N auxiliary antennas.<>
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信道间不匹配对自适应阵列抵消的影响
分析了信道间失配对多副瓣对消器(MSLC)中任意信道数和任意带宽波形的部分自适应阵列干扰消除的影响。导出了剩余功率作为信道间失配、雷达带宽和阵列参数的函数的一般方程。为了阐明对消对信道间误差的依赖关系,得到了泰勒级数展开式。结果表明,对于所有干扰位置和功率水平以及任意数量的辅助天线,适应功率与未适应主功率的比值大于1- mu(其中mu为平均信道间失配相关系数)。给出了窄带正交方向矢量的特殊、简单几何情况。在这种情况下,对于K个干扰源和N个辅助天线,适应功率与未适应功率的比值近似等于(1- mu)(1+K/N)
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