| 摘要 |
<p>PROBLEM TO BE SOLVED: To decrease a wrong detection probability and correctly detect a very near distance target approaching at high speed, by constituting a plurality of distance gates and judging an order and a combination of outputs of the distance gates. SOLUTION: At a transmission system, carrier waves output from a high-frequency oscillator 1 are mixed by a mixer 3 with an M series code, a GOLD series code or an optional series code output from a code generator 2, amplified by a power amplifier 4 and transmitted from a transmission reception antenna 6 through a circulator 5. At a reception system, waves to be modulated which are reflected from a very near distance target approaching at high speed and wave interferences of a frequency near a frequency of the oscillator 1, etc., are received by the antenna 6, mixed with the output of the oscillator 1 by a mixer 7 through the circulator 5. A low-frequency signal is amplified by an amplifier 8 and distributed by a distributor 9 to at least two or more kinds of signals. In the meantime, the series code output from the generator 2 is delayed by a delay array 10. As a result, at least two or more kinds of distance gates are constituted and mixed with an output of the distributor 9 by an array 11.</p> |
