Scientists predicted that Tuesday will be a fraction of a second shorter than normal as the Earth's rotation is moving faster ...

Second, to solve the problem that a single compensation method cannot meet the accuracy requirements of THz SAR, the maximum contrast method after polar coordinate format conversion is used for ...

The poles can flip over the course of hundreds or thousands of years, and this can happen at random, with intervals ranging anywhere from 10,000 years to 50 million years or more. Around 41,000 years ...

In order to solve the problem of longitude convergence occurs in polar region, which leads to the lack of northbound reference and calculation overflow in the north-pointing inertial navigation system ...