CAJ | 학술논문

CDR (China Digital Radio)数字音频广播是我国自主研发的 FM 频段(87-108 MHz)数字音频广播新标准，它兼容我国现有模拟 FM 广播的频谱规划，能够满足我国 FM 频段声音广播从模拟到数字平滑过渡的需求。该文从 CDR 信号结构入手，重点探讨了基于该广播的外辐射源雷达信号特性及相关处理方法。首先分析其信号特性以及作为外辐射源雷达照射源的模糊函数特性；然后针对因循环前缀引起的模糊函数副峰、同步信号引起的多普勒模糊带以及信号频谱不连续导致的距离副峰对目标探测的不利影响，分别提出了相应的副峰抑制方法，并通过仿真验证了该方法的有效性。
CDR (China Digital Radio)수자음빈엄파시아국자주연발적 FM 빈단(87-108 MHz)수자음빈엄파신표준，타겸용아국현유모의 FM 엄파적빈보규화，능구만족아국 FM 빈단성음엄파종모의도수자평활과도적수구。해문종 CDR 신호결구입수，중점탐토료기우해엄파적외복사원뢰체신호특성급상관처리방법。수선분석기신호특성이급작위외복사원뢰체조사원적모호함수특성；연후침대인순배전철인기적모호함수부봉、동보신호인기적다보륵모호대이급신호빈보불련속도치적거리부봉대목표탐측적불리영향，분별제출료상응적부봉억제방법，병통과방진험증료해방법적유효성。
China Digital Radio (CDR) broadcasting is a new standard of digital audio broadcasting of FM frequency (87–108 MHz) based on our research and development efforts. It is compatible with the frequency spectrum in analog FM radio and satisfies the requirements for smooth transition from analog to digital signal in FM broadcasting in China. This paper focuses on the signal characteristics and processing methods of radio-based passive radar. The signal characteristics and ambiguity function of a passive radar illumination source are analyzed. The adverse effects on the target detection of the side peaks owing to cyclic prefix, the Doppler ambiguity strips because of signal synchronization, and the range of side peaks resulting from the signal discontinuous spectrum are then studied. Finally, methods for suppressing these side peaks are proposed and their effectiveness is verified by simulations.