A system for simultaneous measurement of micro-wave Doppler frequency shift (DFS) and angle of arrival (AOA) is proposed based on a silicon integrated chip. In the chip, two dual-drive Mach–Zehnder modulators (DDMZMs) with a microring resonator (MRR) inserted between them are integrated. When an external laser is coupled into the chip, it is first modulated by two echo signals via the first DDMZM and then goes through the MRR to introduce an optical phase shift to one of the first-order sidebands that falls into the resonance of the MRR. After being remodulated by the transmitted signal at the other DDMZM, the lightwave is coupled out from the chip and separated into two channels by an optical coupler. In each channel, a bandpass filter (BPF) is employed to select the upper and lower sidebands. By measuring and comparing the powers, frequencies, and phases of the beat signals in the two channels, the DFS (without direction ambiguity) and AOA can be acquired. Based on the proposed method, DFS within ±100 kHz at 10, 15, and 20 GHz is successfully estimated with a maximum error of ±0.028 Hz, and AOA measurement from 0° to 75° with errors less than ±1.53° is also realized.

中文翻译：

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基于硅集成芯片的微波多普勒频移和到达角同步测量


提出了一种基于硅集成芯片的微波多普勒频移（DFS）和到达角（AOA）同步测量系统。该芯片集成了两个双驱动马赫-曾德调制器 (DDMZM)，其间插入了微环谐振器 (MRR)。当外部激光器耦合到芯片中时，它首先通过第一个 DDMZM 由两个回波信号调制，然后通过 MRR 将光相移引入落入 MRR 谐振的一阶边带之一。光波在另一个 DDMZM 处被发射信号重新调制后，从芯片中耦合出来，并通过光耦合器分成两个通道。在每个通道中，采用带通滤波器（BPF）来选择上边带和下边带。通过测量并比较两个通道中差拍信号的功率、频率和相位，可以获得DFS（无方向模糊）和AOA。基于所提出的方法，成功地估计了10、15和20 GHz下±100 kHz范围内的DFS，最大误差为±0.028 Hz，并且还实现了0°至75°的AOA测量，误差小于±1.53° 。