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介绍的是用于对高分辨率成像光谱仪机上实时数据压缩系统进行测试和考查的计算机辅助性能系统。以美国 NASA 地球资源信息库提供的地物光谱作为模拟地面目标光谱,按照 HIRIS 实际测量的条件、参数将这些光谱数据经计算机送入到一个专门的 GIFOV 光谱数据发生器中。考核测试时存放在发生器中的光谱数据以 HIRIS 在空间测量时各镶嵌子探测器的读出时钟相同的速率送待测压缩系统,压缩系统在这个输入数据时钟控制下,对模拟原始输入数据进行实时压缩。压缩完毕后用双向数据传输接口将压缩结果送计算机进行恢复,再与原始数据进行比较。最后由计算输出测试结果。这种测试系统可很好地模拟 HIRIS在空间测量时产生的原始数据的实际压缩情况,可客观、准确地评价压缩系统的性能。
Introducing a computer-aided performance system for testing and examining real-time data compression systems onboard high-resolution imaging spectrometers. According to the actual measured conditions of HIRIS, these spectral data are computerized into a special GIFOV spectral data generator by using the object spectrum provided by the NASA Earth Resources Information Base in the United States as the simulated ground target spectrum. The spectral data stored in the generator during the evaluation test is sent to the system under test at the same rate as the read clock of each embedded sub-detector when the HIRIS is measured in space. The compression system, under the control of the input data clock, simulates the original input data Real-time compression. After the compression is completed, the compression result is sent to the computer for restoration by the bidirectional data transmission interface, and then compared with the original data. Finally, the output test results calculated. This test system can well simulate the actual compression of raw data generated by HIRIS in space measurement and can objectively and accurately evaluate the performance of the compression system.