| 摘要 |
A general purpose system and method for transmitting and coherently detecting UWB waveforms is predicated on the formation of conjugate pair of UWB waveforms. The in-phase and conjugate quadrature waveforms are orthogonal to each other and have the same power spectrum so that when squared and added they sum to the modulation envelope of the waveforms. By defining the waveform pair in this manner, a relatively simple and inexpensive transceiver can be used to transmit and receive the waveforms and yet preserve maximum range resolution and recover all possible energy in the returned waveforms. The transceiver transmits the in-phase UWB waveform and the conjugate quadrature UWB waveform with either a known time delay or orthogonal polarization relation. The time delay may be varied to suppress aliased return signals. A general purpose receiver detects the return waveforms, aligns them and then processes the waveforms using conventional techniques to extract target information including amplitude, phase, motion, imaging, etc. The transmission and detection of the conjugate waveforms is easily incorporated into a phased array system that comprises a plurality of transceivers.
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