TIME DELAY INTEGRATION SENSOR WITH CHANGEABLE LINE TIME DIFFERENCE

The present invention provides a time delay integration (TDI) sensor using rolling shutter. The TDI sensor includes multiple pixel columns. Each of the pixel columns includes multiple pixels arranged in an along-track direction, wherein two adjacent pixels or two adjacent pixel groups in every pixel column have a separation therebetween. The separation is a multiplication of a pixel height with a time ratio of a line time difference of the rolling shutter and a frame interval, or a summation of at least one pixel height and a multiplication of the pixel height with a time ratio of the line time difference and the frame interval. The line time difference of the TDI sensor is changeable without changing the separation.