An Imaging System with Robust Spot Detection for Space Laser Communication ATP Systems

Area of Science:

• Spacecraft engineering
• Optical communication systems
• Embedded systems design

Background:

• Traditional multi-chip architectures face bandwidth and power limitations in inter-satellite laser communication ATP systems.
• Thermal-induced timing misalignments challenge high-frame-rate image capture in spaceborne systems.

Purpose of the Study:

• To develop a highly integrated hardware-software co-design imaging system for spaceborne ATP.
• To overcome limitations of traditional architectures by optimizing Size, Weight, and Power (SWaP) metrics.

Main Methods:

• Integration of a CMV4000 sensor and XCKU060 FPGA with a Loongson LA132 soft core.
• Implementation of LVDS dynamic phase compensation and multi-stage synchronization for 180 fps error-free capture.
• Application of a least-squares circle-fitting algorithm with nonlinear error compensation for spot distortion and noise mitigation.

Main Results:

• Stable output of 2048 × 2048 resolution images.
• Positioning Root Mean Square Error (RMSE) within 1.5 pixels under extreme conditions (5 dB SNR, 60% spot loss).
• Demonstrated optimization of SWaP metrics.

Conclusions:

• The proposed system offers a robust, high-precision solution for spaceborne ATP systems.
• The integrated design effectively addresses bandwidth, power, and timing challenges.
• The system achieves superior performance in adverse conditions, crucial for reliable satellite communication.