A pixel interconnect circuit that can be added to a focal plane array to enable subpixel location capability (subpixel sensing) for an imaged point source, facilitating very high frame rate operation. The pixel interconnect is typically added as a circuit component within the readout integrated circuit. The interconnect function can be turned on or off flexibly. It allows very low pixel count arrays, such as 128×128 pixels, to achieve the positional accuracy of multi-megapixel arrays. In turn, these small arrays can be clocked at very fast frame rates for enhanced threat and fast event detection. Existing systems can be upgraded by adding the pixel interconnect, which will greatly improve tracking and position accuracy without increasing data processing requirements. By modifying the focal plane while leaving other components unchanged, the pixel interconnect provides an economical upgrade for threat warning and tactical sensor systems.