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Distributed Synthetic Aperture Radar (DSAR) missions impose stringent relative navigation requirements, including sub-millimeter position and millimeter-per-second velocity knowledge, for applications such as single-pass interferometry. This paper presents the design and performance analysis of a Frequency-Modulated Continuous-Wave (FMCW) LiDAR system for DSAR metrology. The system operates at 1550 nm and employs integrated photonics for reduced Size, Weight, and Power (SWaP). Key LiDAR parameters are derived from DSAR mission specifications, such as a 2 km maximum inter-satellite range and a 100 Hz update rate, resulting in a 150 GHz chirp bandwidth and a 10 ms coherent integration time. The proposed architecture incorporates a heterogeneous System-in-Package design. Performance analysis, with a calculated electrical Signal-to-Noise Ratio (SNR) exceeding 30 dB, indicates theoretical range precision of 28.7 μm and velocity precision of 0.71 μm/s. These findings suggest the photonic integrated LiDAR can meet the 1 mm range and 1 mm/s velocity targets for DSAR formation control.

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Design of FMCW LiDAR for Precision Relative Navigation in Close Formation Distributed SAR

  • 会议论文

  • 发表日期：

    2025年

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  • Mattia Tagliente,
  • Giuseppe Brunetti,
  • Caterina Ciminelli

摘要

Distributed Synthetic Aperture Radar (DSAR) missions impose stringent relative navigation requirements, including sub-millimeter position and millimeter-per-second velocity knowledge, for applications such as single-pass interferometry. This paper presents the design and performance analysis of a Frequency-Modulated Continuous-Wave (FMCW) LiDAR system for DSAR metrology. The system operates at 1550 nm and employs integrated photonics for reduced Size, Weight, and Power (SWaP). Key LiDAR parameters are derived from DSAR mission specifications, such as a 2 km maximum inter-satellite range and a 100 Hz update rate, resulting in a 150 GHz chirp bandwidth and a 10 ms coherent integration time. The proposed architecture incorporates a heterogeneous System-in-Package design. Performance analysis, with a calculated electrical Signal-to-Noise Ratio (SNR) exceeding 30 dB, indicates theoretical range precision of 28.7 μm and velocity precision of 0.71 μm/s. These findings suggest the photonic integrated LiDAR can meet the 1 mm range and 1 mm/s velocity targets for DSAR formation control.