| 摘要 |
<p>PROBLEM TO BE SOLVED: To catch.track a very near distance moving target, by changing a plurality of delay amounts of a plurality of series codes by a computer on the basis of a distance to the moving target and varying a maximum search distance, a minimum search distance and a distance resolution in a three-dimensional wave sensor. SOLUTION: Two kinds of transmission output signals are mixed by a mixer 2 with an M series, a GOLD series or an optional series code from a code generator 3, amplified by an amplifier 4 and transmitted towards a target object from an upper and a lower direction antennas 5 and 6. Received waves are mixed by a mixer 11 with an output of an oscillator 1 to become a video signal from which only a signal of the moving target is extracted. The signal is amplified by an amplifier 12. Two kinds of output series codes from the generator 3 are delayed by a delay device 14. As a result, substantially four kinds of series codes and amplified video signal are mixed by a mixer 13. A far distance gate output and a near distance gate output of an output signal of the mixer 13 are compared in output level by a comparator 15. When the gate outputs become not smaller than a fixed level and the same value, a stop signal is output to a scanner 16.</p> |
