Multi-range-resolution radar using inverse filters

The resolution of a radar range is generally fixed regardless of the detection range. The proposed receiving system for radars is configured with multiple inverse filters so that it has different range resolutions depending on the detection range, and the signal is compressed to a narrow arbitrary pulse width of less than or equal to the reciprocal of the spectrum bandwidth of the transmitted signal. Then the proposed receiving system may be able to have no sidelobes. The frequency response function of each inverse filter used in the receiver is expressed as D(f)/S(f), where D(f) is the Fourier transform of the desired output waveform d(t) and S(f) is the Fourier transform of the transmitted waveform s(t). Specific signal examples are used to clarify what sort of D(f) and S(f) are suitable for preventing D(f)/S(f) from diverging. With regard to this proposed receiving system, a theoretical improvement factor is indicated for the signal-to-noise ratio, and simulations and experiments are conducted to confirm the validity of the proposed receiving system.