摘要
相控阵馈源(Phased array feeds,PAFs)接收机作为下一代微波接收机,为大口径射电天文望远镜的射电干扰(Radio Frequency Interference,RFI)缓解工作带来了新的解决方法.PAFs接收机对射电望远镜焦平面的电磁波进行空域采样,返回时域阵列信号,使用最小方差无失真响应(Minimum Variance Distortionless Response,MVDR)波束合成器可以自适应地识别RFI的方向,同时抑制RFI在输出信号中的功率,从而达到提升射电望远镜灵敏度的效果.仿真结果表明MVDR波束合成器对有源高能量的射电干扰有很强的识别能力和一定程度的缓解能力,同时,该波束合成器对各阵元信道中加性噪声累积引起的无源干扰有很强的抑制能力,因此,PAFs接收机的MVDR波束合成器可以增强日益复杂电磁波环境下射电望远镜的抗干扰能力.
The phased array feeds(PAFs) receiver is a next-generation microwave receiver that provides a new solution to reduce Radio Frequency Interference(RFI) for large-aperture radio astronomy telescopes.The PAFs receiver samples the electromagnetic wave in the focal plane of the radio telescope in spatial domain and returns the time-domain array signal. The use of Minimum Variance Distortionless Response(MVDR) beamformer allows for adaptive identification of the orientation of RFI while suppressing the power of RFI in the output signal, thereby enhancing the sensitivity of the radio telescope. The simulation results show that the MVDR beamformer has a strong ability to identify and mitigate active high-energy radio interference. Meanwhile, the beamformer has a strong ability to mitigate passive interference caused by the accumulation of additive noise in each array element channel. Therefore, the MVDR beamformer for PAFs receiver enhances the anti-interference capability of the radio telescope in the increasingly complex electromagnetic wave environment.
作者
李健
仵鹏
段雪峰
裴鑫
张青松
陈卯蒸
LI Jian;WU Peng;DUAN Xue-feng;PEI Xin;ZHANG Qing-song;CHEN Mao-zheng(Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011;Xinjiang Key Laboratory of Microwave Technology,Urumqi 830011;Xinjiang Radio Astrophysics Laboratory,Urumqi 830011;University of Chinese Academy of Sciences,Beijing 100049)
出处
《天文学报》
CAS
CSCD
北大核心
2023年第1期7-14,共8页
Acta Astronomica Sinica
基金
国家自然科学基金项目(12073067、12073066)
新疆维吾尔自治区重点实验室开放课题(2020D04014)
西部之光项目(2019-XBQNXZ-B-018)资助。
关键词
波束合成器
射频干扰
信号识别
beamformer
radio frequency interference(RFI)
signal identification
