Rapid matching algorithm for hyperspectral image based on norm sifting

We propose a rapid spectral matching method by lowering number of comparisons, processing time can be saved. Firstly, 1-norm is chosen as length measure of spectrum, and with this criterion, a 1-norm database is built. Secondly, a subspace is constructed from the whole reference library by retaining the references with the most similar 1-norm values. Finally, matching operations are performed in the subspace to obtain the match result. Simulations of geological mapping with ASTER spectral library show that the proposed method can significantly reduce processing time and enhance accuracy compared with traditional and dimension reduction methods.     

随机噪声对海洋布里渊激光雷达测量的影响

为了分析激光雷达系统中随机噪声对海水布里渊散射谱以及温度反演精度的影响,依据布里渊散射理论及系统噪声特性,对带噪布里渊散射频谱进行了理论分析,并进行了信噪比从1dB~100dB的仿真实验。结果表明,当信噪比大于16dB时,频移和线宽的平均误差和不确定度能够控制在兆赫兹量级,温度误差和不确定度能够控制在0.2℃以内;采用实际应用中多次测量取平均的方法,10次平均能够保证0.2℃的测量精度对信噪比的要求下降到7dB。这为激光雷达在海水高精度遥感提供了指导。