Geometric superresolution is an important technology to improve resolution of remote sensing. Code division multiplexing is a new method of the technology. This method does not involve additional mechanical elements, such as those used for microscans. Fixing the code-division-multiplexing board using the Fourier optics is discussed and the 1D and 2D images are simulated. Then, the influnceing factors on the result of simulations are analyzed, and the solutions are given briefly.