| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a complex system, such as an automotive obstacle-detection system, which utilizes continuous modulated microwaves or a signal detection system that does not use a Doppler signal processor. <P>SOLUTION: A transmitted signal and a received signal are combined and the baseband signal thus obtained is supplied to a quadrature multiplier. Supplied to the other input of the multiplier is an auxiliary signal generated by a quadrature Doppler generator. Either the transmitted signal or the received signal is combined with an auxiliary signal containing a range of frequencies corresponding to an anticipated Doppler shift, so that an output of the combined transmitted and received signal will be present only if a target signal exhibiting a Doppler shift within the anticipated range is present. The auxiliary signal contains finite-duration signal portions of different types so as to provide a substantially uniform frequency response throughout the selected range. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
