The present disclosure provides a time delay integration (TDI) sensor to move with respect to a scene in an along-track direction. A pixel array of the TDI sensor includes multiple pixel columns each including multiple pixels arranged in the along-track direction. Each pixel column includes a first pixel and a second pixel adjacent to each other. The second pixel includes an extra transfer transistor connected between a photodiode of the second pixel and a floating diffusion node of the first pixel.