| Usually the powerful disturbance equipment used by policemen works at block jam-mode. When it is working, its output signal will jam all the radio wave which has the similar frequency, not only to the offenders's detonating signal but also to the policemen's communication signal. There are two ways to solve this problem.(1) Use method (1) named "the programmable trapping wave", which is merged with frequency spectrum convert in linear ,Direct Digit Synthesizer and Surface Acoustic Wave Filter, to open a communication band in jam-band willfully.(2) Use the technology of digit frequency-sweep (method 2) to adjust the sweep range in order to open a communication's window in jam-band.Based on the principle elaboration and theory inference, the first method has been demonstrated in detail and has been specifically designed as well . A feasibility analysis and a initial design has also been given in the second method. Finally, an objective comparison has been made between these two methods. |
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