Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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On the Control of Initial Phases in Optical Phased Array Based LADAR Systems: Hill-Climbing Based Approach

광위상배열 기반 LADAR의 초기 위상 제어 기법 연구: 언덕 오름 기반 접근법

  • Kim, Taehoon (Institute of Defense Advanced Technology Research, Agency for Defense Development)
  • 김태훈 (국방과학연구소 국방첨단기술연구원)
  • Received : 2019.05.30
  • Accepted : 2019.07.26
  • Published : 2019.08.05
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Abstract

Recently, optical phased array(OPA) based laser detection and ranging(LADAR) has gained great interest to replace the traditional mechanical light detection and ranging technique(LiDAR). In OPA-based LADAR, it is well known that phases of laser pulses traveling through each of channels should be the same to obtain a narrow free-space single beam without noise-like ripples in the far field. However, it is difficult to provide such ideal condition due to the fabrication errors. To tackle this problem, any algorithms should be necessary to compensate the initial random phases of each channel in OPA antenna. In this paper, we propose a hill-climbing based phase calibration algorithm and evaluate the performance of the proposed algorithm.

Keywords

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Fig. 1. Configuration of optical phased array antenna

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Fig. 2. Comparison of far-field patterns for varying the amount of randomness

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Fig. 4. Comparison of searching space between exhaustive search and hill-climbing algorithms

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Fig. 3. Comparison of the size of searching space for varying the number of applicable phase levels per channel

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Fig. 5. Flow chart of our proposed phase calibration algorithm

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Fig. 6. Comparison of far-field patterns with/without phase calibration for various objective functions

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Fig. 7. Comparison of calibrated phases

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Fig. 8. Comparison of far-field beam patterns

Table 1. Types of objective functions

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Table 2. Simulation parameters and values

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