CAJ | 학술논문

传统意义上的干涉仪测向数学模型与处理流程一般要求目标信号具有正信噪比( SNR)，在对负SNR调制信号实施测向时通常会产生较大误差甚至失效。在分析传统方法失效原因的基础上，利用数字调相信号的特点，通过非线性变换对负SNR信号进行高次载波恢复，然后针对恢复后的高次载波进行相位差提取，从而获得被测信号的来波方向。在此基础上对该方法所能达到的精度进行了理论分析，并将其推广至凡是具有可恢复载波分量的测向应用情况。仿真结果验证了该方法的有效性，这对于干涉仪在电子侦察和电磁频谱监测中更加广泛的应用提供了新的参考。
전통의의상적간섭의측향수학모형여처리류정일반요구목표신호구유정신조비( SNR)，재대부SNR조제신호실시측향시통상회산생교대오차심지실효。재분석전통방법실효원인적기출상，이용수자조상신호적특점，통과비선성변환대부SNR신호진행고차재파회복，연후침대회복후적고차재파진행상위차제취，종이획득피측신호적래파방향。재차기출상대해방법소능체도적정도진행료이론분석，병장기추엄지범시구유가회복재파분량적측향응용정황。방진결과험증료해방법적유효성，저대우간섭의재전자정찰화전자빈보감측중경가엄범적응용제공료신적삼고。
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.