用于方向回溯天线的Costas环相位共轭电路设计

doi:10.12305/j.issn.1001-506X.2021.11.05

Abstract

Abstract:

In order to realize the real-time automatic antenna beam pointing, namely retrodirective, a kind of phase conjugate circuit based on Costas loop is put porword. Meanwhile, the phase conjugate circuit has the ability of demodulating the modulated signal, namely the ability to realize full-duplex communication. Firstly, the improved Costas loop structure is used to realize the data demodulation and carrier recovery of the modulated signal. Then, the phase conjugation of the recovered carrier is carried out by heterodyne mixing structure, and the signal is modulated and output as the transmitted carrier, so as to realize the automatic real-time pointing of the forward wave direction of the array antenna, that is, the full duplex communication with retrodirective ability is realized. Finally, the function of the circuit is verified by simulation. The results show that the quadrature phase shift keying modulation signal can be demodulated under different input carrier-to-noise ratios, and the demodulation signals of adjacent radio frequency channels are in phase superposition, and the phase difference conjugation of the coherent carrier signals of adjacent channels is verified, so the beam self-tracking and full-duplex communication ability of the phase conjugation circuit is verified.

Key words: duplex communication, phase conjugate, Costas loop, carrier recovery

CLC Number:

TN820

Rumeng CHEN, Yunhua ZHANG, Pengfeng CHEN, Haitao CHEN, Guoqiang ZHU. Design of Costas loop phase conjugate circuit for retrodirective antenna[J]. Systems Engineering and Electronics, 2021, 43(11): 3072-3077.

Figures/Tables 10

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References 31

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相位差范围	VCO本地载波初始相位状态
[-45°, 45°)	0°
[45°, 135°)	90°
[135°, 225°)	180°
[225°, 315°)	270°

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Design of Costas loop phase conjugate circuit for retrodirective antenna

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