电讯技术Issue(4)：418-423,6.DOI:10.3969/j.issn.1001-893x.2014.04.008
负SNR数字调相信号的干涉仪测向技术
Direction Finding Using Interferometer for Digital Phase-modulated Signal with Negative SNR
摘要
Abstract
The signal with positive SNR ( Signal-to-Noise Ratio) is required for the mathematic model and processing flow of the interferometer in traditional direction finding method. But the large error or invalida-tion of the model usually occurs, when it is used for the modulated signal with negative SNR. After the reason is analyzed, the characteristic of the digital phase-modulated signal is utilized and the high-order carrier wave is recovered through the non-linear transform. Then direction finding is completed based on the phase difference measurement for recovered high-order carrier, and the precision of this method is the-oretically discussed. Finally, the method is generalized for the condition that the carrier element can be re-covered from the measured signals in direction finding applications. Its validity is demonstrated through simulation,which provides a new reference for applying the interferometer more widely in the electronic re-connaissance and electromagnetic spectrum surveillance.关键词
数字调相信号/负信噪比/干涉仪测向/非线性变换/高次载波恢复/测向精度Key words
digital phase-modulated signal/negative SNR/direction finding using interferometer/non-line-ar transform/high-order carrier wave recover/direction finding precision分类
信息技术与安全科学引用本文复制引用
石荣,邓科,阎剑..负SNR数字调相信号的干涉仪测向技术[J].电讯技术,2014,(4):418-423,6.基金项目
国防科技重点实验室基金项目(9140C100404120C10041)@@@@Key Lab Funds of National Defense Technology(9140C100404120C10041) （9140C100404120C10041）
