The spatial resolution of microwave imaging is the ability to distinguish between two identical radiating bodies in close proximity to each other . It provides the ability to distinguish details of an object and thus determine its shape.
In the microwave imaging system, the antenna can be regarded as the first level of the received signal, any antenna due to its certain beamwidth, flap level and energy loss, can not completely pass all the information to be measured feature division. The spatial distribution of the feature to be measured through the antenna scanning rate can be transformed into the time distribution of the signal to be measured, because of this spatial and temporal interchangeability, resulting in the antenna power direction map of the spatial frequency low-pass filtering effect can be transformed into the time frequency low-pass filtering effect of the signal to be measured. For a microwave imaging system to have high sensitivity, it must require a receiver with a low noise temperature, a large bandwidth and a long integration time. Integration time selection depends on the application requirements, and sensitivity, scanning speed to do the appropriate match.