| 摘要 |
The invention relates to a radar system which comprises: (a) at least two transmitting units for simultaneously, and in synchronization transmitting electromagnetic radiation in distinct frequencies f1, f2, f3 . . . towards a space of interest; and (b) at least one receiving unit tuned to a frequency of nf1+mf2+qf3 . . . , wherein n, m, q . . . being integers not equal to zero, for receiving a non-linear response of said radiation from objects located within the said space of interest, and wherein the system is characterized in that said transmitted pulses are narrow pulses having duration in the range of between about 1 nanoseconds and about 100 nanoseconds.
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