Ground satellite signal interference from interference can be divided into digital TV signal jammer and carrier (or narrowband) signal interference. The former is the use of the illegal interference mode, that is to use the same, normal digital form of transmission signal, so that normal image Mosaic or black. To take advantage of the main interference power, namely, transfer power to the implementation in the frequency range to take up the channel of the power of satellite receiving, the field intensity of jamming signal to the ground, with the same frequency of the signal interference is much bigger than normal satellite signal strength, made by press the objective satellite reception. The latter is divided into uniform channel interference and disturbance of different frequency, z in terms of co-channel interference, interference can cause serious image Mosaic or interruption phenomenon, seriously interfere with the black screen will be displayed. For the frequency interference, due to the effect of satellite receiving frequency selection, allowing the noise level higher than the signal level, but large enough to cause the interference of saturation level, the tuner and TV screens will appear blank screen. However, satellite signals become saturated with interference levels, so the tuner and TV screen will appear black.