分析了DMD型红外场景模拟器相较电阻阵型在半实物仿真实验中没有广泛应用的原因。通过分析发现DMD型模拟器的数据传输带宽的大小和外同步触发延时长短对系统的实时性都有影响，并且指出图像接口的数据传输带宽高于有效带宽2倍时才能满足系统仿真的高实时性要求。设计了满足实时性要求的专用千兆网的硬件，具有极小的延时时间并且满足UDP/IP协议的数据传输软件和有利于DMD灰度显示高实时性的图像分割和存储的方法。实验验证了该方法能够传输100 Hz以上的分辨率为1 024×768的8位灰度图像，而外同步触发信号与系统播放开始信号延时仅为70 μs，并具有良好的稳定性。

The reason why it is the resistor array but not the Digital Micro-mirror Device(DMD) that the widely used infrared scene projector was based on real time hardware-in-the-loop simulations(HILS) was pointed out. It was found that both image data transmission bandwidth of the interface and latency of external synchronization signal had impact on real-time performance. Analysis proved that only when the image data transfer bandwidth was 2 times higher than the effective bandwidth, it will meet the critical requirement of real-time simulation system. Dedicated Gigabit Ethernet hardware which meets this requirement was designed, and its software was compliant with UDP/IP protocol. The image transfer delay was only last for one MAC frame. The image data was reordered and stored in a particular way. Experiments proved that with great stability the speed of transferring 8-bit image data with 1 024×768 resolutions was above 100 Hz and the latency between external synchronization signal and starting signal of projecting was only 70 μs.