| 摘要 |
<p>PURPOSE:To highly precisely measure the range to a target body the relative speed to the target body which appears at a very near range and moves slowly, by providing a transmitter, a waveguide, a variable attenuator, etc. CONSTITUTION:Transmitted 1a RF power is passed from the terminal 1 to terminal 2 of a directional coupler 3a and from the terminal 1 to terminal 2 of a circulator 4a and radiated 5a. The radiated 5a RF power is reflected by a corner reflector 9 and part of the reflected RF power is received by a radiator 5a. The power is variable-attenuated 10a and applied to coaxial/ waveguide conversion 7a' through a unilateral tube 6a'. The received power is again applied to coaxial/waveguide conversion 7a when passing through a waveguide 8a and absorbed by the next unilateral tube 6a. On the other hand, the transmitted 1b RF power advances from the terminal 1 to terminal 2 of a coupler 3b. Moreover, an electric-field standing wave is produced by the progressive wave from the unilateral tube 6b side and reflected wave from the unilateral tube 6a side in a waveguide 8b. Then the distance to a target is found in the unit of 1/2 wavelength in accordance with the standing wave and, at the same time, the moving speed of the target can be found from the produced cycle of the trough of a standing wave.</p> |
