传统的干涉仪测向系统中,测向精度受到阵列有效孔径的限制。利用四阶累积量的阵列扩展特性,可以达到在解测向模糊的同时保证测向精度的目的。通过对四阶累积量阵列扩展特性及干涉仪测向原理的研究,提出了将阵列扩展特性应用于干涉仪测向系统的测向方法。推导采用不同扩展阵元构成长基线测向时,对应的测向误差公式,得到获得较高的测向精度所需满足的天线阵元间距关系。Matlab仿真结果验证了此方法的正确性。

Direction finding precision is limited by effective aperture in traditional interferometer direction finding system. Using the array of four order extension properties, the purposes of solving direction finding ambiguity and improving the direction finding precision were a-chieved. With researching of array extension property of four order cumulant and theory of interferometer direction finding, the application of array extension in interferometer direction finding system was proposed. Direction finding error formula was derived with different long baseline which is composed of different extension array element. The relationship of array element distance was derived to get higher direc-tion finding precision. The simulation result with Matlab proves validity of the proposed theory.