基于微波光子相干接收的宽带射频前端技术

Broadband RF Frontend Technique Based on Coherent Heterodyne Detection in Microwave Photonics

提出了一种适用于电子战应用的宽带大动态微波光子射频前端方案,通过采用双边带抑制载波及微波光子相干接收技术,能够有效改善前端的噪声系数、无杂散动态范围等。在6~18 GHz工作频带内,该射频前端无杂散动态范围达到110 dB·Hz^(2/3)、噪声系数优于8 dB、多通道幅度一致性优于±1 dB、多通道相位一致性优于±10°,实现了宽带射频信号的高性能传输,同时满足阵列光学波束需求。

A broadband microwave photonic front-end that suits for electronic warfare is proposed in this paper. Significant improvement in noise figure and spur-free dynamic range is accomplished by using double sideband suppressed carrier modulation and balanced coherent heterodyne detection. In the frequency bandwidth of 6~18 GHz, a spur-free dynamic range up to 110 dB·Hz^(2/3), a noise figure of 8 dB, an amplitude consistency better than ±1 dB and a phase consistency better than ±10° are implemented by using coherent detection, which makes it especially applicable for microwave photonic beam-forming, in addition to the RF transmission.