title: Principle and performance analysis of coherent tracking sensor based on local oscillator beam nutation.
abstract: By integrating coherent tracking sensor functionality into a coherent communication receiver, a dual-function receiver with coherent boresight error sensing is developed for tracking in coherent free-space optical communication systems. The sensor principles are analyzed according to optical interference theory, and the boresight error detection algorithm and small signal linear model are derived. Analysis of local-oscillator beam nutation on system performance shows that the best nutation half-angle is 0.5-1 μrad, the noise equivalent angle is less than 0.02 μrad, and the communication sensitivity degradation is 0.2-0.6 dB. This technology opens new avenues for free-space optical communication system design.
authors.forename: Ke
authors.initials: K
authors.lastname: Deng
authors.forename: Bing-Zhong
authors.initials: BZ
authors.lastname: Wang
authors.forename: Gu-Hao
authors.initials: GH
authors.lastname: Zhao
authors.forename: Jian
authors.initials: J
authors.lastname: Huang
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Da-Gang
authors.initials: DG
authors.lastname: Jiang
authors.forename: Zhou-Shi
authors.initials: ZS
authors.lastname: Yao
mesh_terms: D000465:Algorithms; D017076:Computer-Aided Design; D004867:Equipment Design; D055096:Optical Devices; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*