IMPROVEMENTOF K-DISTRIBUTION PRECISION FOR CALCULATING THE TRANSMISSION OF SATELLITE REMOTE SENSING CHANNEL

The absorption band of oxygen at 0.76μm may be used for satellite remote sensing pressure of ocean, earth and cloud surface. The relative variation of pressure is about 10^-3, so the precision of vertical transmission calculated by k-distribution method must be less than 10^-3. According to the increase of computer velocity, the way to increase the precision of vertical transmission calculated by k-distribution method includes: (1) decreasing the simplify calculating processes, (2) when the variation of absorption coefficient is complicated in the channel, increasing the number of sectional points. The extreme number of sectional points is 136, the extreme stand error of vertical transmission calculated by k-distribution method is less than 3×10^-5