| 摘要 |
PURPOSE:To enhance the measuring accuracy of a slant range, by changing the phase of a phase shifter corresponding to an antenna elevation angle. CONSTITUTION:The monopulse synthesizer of an antenna 3 is formed of first hybrids 15-1, 15-2, second hybrids 16-1, 16-2 and a termination device 17. In order to control the gain difference of two peaks of different patterns, a phase shifter 18 is provided between the first hybrid 15-1 and the second hybrid 16-2 and driven by a drive circuit 19. After all, the phase of the above mentioned phase shifter 18 is changed corresponding to an angle formed by an antenna boresight axis and the earth plane so that an elevation difference channel signal reflected from the earth is made symmetric in the amplitude thereof before and after the center of the slant range on the antenna boresight axis and the measuring accuracy of the slant range can be enhanced. |
