微光探测成像系统电路设计与实现

为满足微光遥感卫星领域对微光探测的需求，本文提出了一种基于微光CMOS图像传感器GSENSE2020的成像电路设计。该成像电路通过FPGA实现了对图像传感器的驱动控制以及高速图像数据的接收和传输，通过DC/DC和LDO（low dropout regulator）为图像传感器提供了低噪声供电电源，采用PMIC（power management IC）解决了FPGA上电时序问题，利用DDR3实现高速图像缓存与处理，采用eMMC达到图像数据存储速率与容量的需求，应用FPGA的IP核及原语代替CameraLink接口转换芯片实现CameraLink通信协议，从而完成图像数据直接在CameraLink接口的高速传输。实验结果表明，成像系统电路功能及性能都达到了预期设计目标，系统的输出数据率可达2.4 Gbps，帧频高达25 fps，信噪比达到45.5 dB。

Design and Development of a Low-Light Detection Imaging System Circuit

To achieve low-light detection in low-light remote sensing satellites, an imaging circuit is designed based on a low-light complementary metal oxide semiconductor image sensor named GSENSE2020. The imaging circuit facilitates the drive control of the image sensor and the reception and transmission of high-speed image data through a field programmable gate array (FPGA), provides low-noise power supply for the image sensor through DC/DC and low-dropout regulator, and uses a power management integrated circuit to solve the problem of FPGA power-on timing. The circuit also uses DDR3 to perform high-speed image caching and processing and adopts an embedded multimedia card to meet the requirements of image data storage rate and capacity. The intellectual property core and primitives of the FPGA are used instead of a CameraLink interface conversion chip to establish the CameraLink communication protocol. Thus, the circuit can directly transmit image data with high speed to the CarameLink interface. The experimental results show that the circuit's functions and the performance of the imaging system reach the expected design goals. The output data rate of the system reaches 2.4 Gbps, frame rate reaches 25 fps, and signal-to-noise ratio reaches 45.5 dB.