为了实现对TDI CCD空间光学遥感系统的合理设计及应用,提出了高速并行实时检测CCD控制信号的方法和视频图像连续输出的仿真设计方案。利用CCD行读出及转移的200 μs周期,对48路控制CCD驱动信号和31路直流偏置信号进行并行实时逻辑分析及检测。同时,把预制的CCD模拟图像,从磁盘阵列经PCI-X及LVDS总线高速传输到由现场可编程门阵列(FPGA)、D/A、放大和滤波电路组成的视频图像生成系统,实现了连续、实时输出各种模拟测试图像。实验结果表明,提出的信号检测和生成方法可同时输出3路6 MHz频率的彩色图像和8路12 MHz频率的全色图像像素信号波形,像素信号基准电压为8 V,振荡幅值为0～1.7 V;有效采样时间和信号稳定度均满足成像电路的仿真测试要求。

A method to detect high speed and parallel CCD control signals and to simulate sequential video signal outputs is presented to realize reasonable design and applications of a space optical remote sensing system with high-performance and multi-spectral TDI CCD image sensors.At the line readout and transfer period of 200 μs,48 clock drivers and 31 DC bias signals are analyzed and detected simultaneously.At the same time,the prepared image data are fastly transmitted from a disk array to a video image generator consisting of a FPAG,a D/A,an amplifier and a denoise circuit through the PCI-X and LVDS bus,so that the sequential and real-time outputs of diversified testing video images are realized.It is shown in experiments that three simulative chromatic video signals at a frequency of 6 MHz and eight simulative panchromatic video signals at a frequency of 12 MHz are generated synchronously with the reference voltage of a video signal of 8 V and amplitude ranges of 0~1.7 V and the valid sampling time and the signal stabilization can meet the requirements of the simulation and detection for the imaging circuits.