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本文分析的 FFT 干涉仪测向系统是一种宽带短基线干涉仪体制的测向系统,频谱分析技术的使用,使之适用于所有类型的战术通信信号的测向定位。文中介绍了 FFT 干涉仪测向系统的基本原理及其组成;讨论了 FFT 的输出噪声及其对相位差计算的影响问题;给出了使用汉宁加权 FFT 时,相位差误差的相关函数;最后分析了 FFT 干涉仪测向系统的系统精度。计算机模拟结果与本文提出的理论分析相一致,表明 FFT 干涉仪是一种有效的测向方法。
The FFT interferometer DF system analyzed in this paper is a directional system with a wideband and short baseline interferometer system. The use of spectrum analysis technology makes it suitable for DF positioning of all types of tactical communication signals. In this paper, the basic principle and composition of FFT interferometer direction finding system are introduced; the output noise of FFT and its influence on phase difference calculation are discussed; the correlation function of phase difference error is given when using Hanning weighted FFT; finally The system accuracy of FFT interferometer direction finding system is analyzed. Computer simulation results and the theoretical analysis presented in this paper are consistent, indicating that FFT interferometer is an effective direction finding method.