CAJ | 학술논문

为了减小外辐射源雷达系统中常规杂波相消算法的运算量,该文利用数字电视地面广播(DTTB)照射源中的PN序列,提出了一种快速杂波相消算法.该算法基于PN序列良好的自相关特性,并考虑到DTTB信号对载频频偏(CFO)很敏感,提出2-D信道和CFO估计来提高估计精度;然后,利用估计的信道和CFO进行直达波重构和杂波相消,剩余目标回波和噪声.相比于传统的杂波相消算法,该方法运算量比较小,并且所有处理都基于预警天线,不需要参考天线,简化了系统模型.最后仿真实验验证了算法的有效性.
위료감소외복사원뢰체계통중상규잡파상소산법적운산량,해문이용수자전시지면엄파(DTTB)조사원중적PN서렬,제출료일충쾌속잡파상소산법.해산법기우PN서렬량호적자상관특성,병고필도DTTB신호대재빈빈편(CFO)흔민감,제출2-D신도화CFO고계래제고고계정도;연후,이용고계적신도화CFO진행직체파중구화잡파상소,잉여목표회파화조성.상비우전통적잡파상소산법,해방법운산량비교소,병차소유처리도기우예경천선,불수요삼고천선,간화료계통모형.최후방진실험험증료산법적유효성.
To reduce the computational complexity of conventional cancellation algorithm in passive radar system, a fast cancellation by the Pseudo-Noise (PN) sequence in the Digital Television Terrestrial Broadcasting (DTTB) illuminator is proposed. Based on the good correlation property of PN sequence, and the fact that DTTB illuminator is very sensitive to the Carrier Frequency Offset (CFO), the 2-D time delay and CFO estimation is proposed to improve the estimation accuracy. Once obtaining the time delay and CFO, the direct path signal reconstruction and cancellation can be made, remaining the target echoed signal and noise. Compared with the conventional cancellation method, the method has the smaller computational cost, and all the processing is on surveillance antenna, simplifying the passive radar system model by removing the reference antenna. Finally, the simulation experiments demonstrate the effectiveness of the method.