介绍了一种相机曝光控制实时误差补偿外同步信号产生方法。系统由一系列硬件和软件组成,硬件包括通用GPS接收设备、信号接收整理模块和外同步信号相机电平匹配化模块;软件包括设计在可编程逻辑电路中的外同步信号频率生成与调整模块及外同步信号误差分析与调整模块、外同步信号生成模块及外同步信号相机逻辑匹配化模块。GPS接收设备接收卫星信号并实时输出时间B码,信号接收整理模块将时间B码整理成可编程逻辑器件可以接收的电平信号,可编程逻辑器件通过一系列处理模块生成目标相机的外同步信号,随后外同步信号相机电平匹配化模块将外同步信号整理成相机匹配的电平信号来控制相机曝光。实践证明所提方法可以在不添加额外器件的情况下实现相机曝光时间的实时精确控制,将连续成像的图像序列在时间上的精度从通常的数十微秒级提高到单微秒级。 A method of generating real-time error compensation external synchronization signal for camera exposure control is introduced. The system consists of a series of hardware and software. The hardware includes universal GPS receiving equipment, signal receiving and arranging module and external synchronization signal camera level matching module. The software includes the module for generating and adjusting the frequency of the external synchronization signal and the module for external synchronization signal designed in the programmable logic circuit. External synchronization signal error analysis and adjustment module, external synchronization signal generation module and external synchronization signal camera logic matching module. The GPS receiving device receives the satellite signal and outputs the time B code in real time. The signal receiving and arranging module sorts the time B code into a level signal that the programmable logic device can receive. The programmable logic device generates a target camera external synchronization signal through a series of processing modules , Then the external sync signal camera level matching module will be external sync signal into a camera matching level signal to control the camera exposure. Practice has proved that the proposed method can realize real-time and precise control of the exposure time of the camera without adding additional devices, and improve the temporal accuracy of the continuously imaged image sequence from the usual tens of microseconds to the single microsecond level.