PDF
Full
Outline
The sum and difference channels of S-band single-channel measurement and control equipment exhibit phase differences, which may vary with environmental changes, transmission media, and assembly processes. Phase difference correction must be completed before the signal enters the baseband terminal for demodulation, to ensure the correct angular error signal is demodulated and stable target tracking is ultimately achieved. In practical work, the phase difference correction is basically carried out by setting up beacon machines at high positions, which can effectively solve the problem of inconsistent phase difference. However, with the expansion of the distribution area of measurement and control equipment and the shortening of state preparation time, traditional phase correction methods are no longer applicable. This article focuses on the research of S-band single-channel measurement and control equipment within a certain frequency working range. By pre-testing its phase difference and adopting methods such as cable compensation or adding phase shifters, the impact of phase difference on angular error is reduced within a certain error range at the design stage. In the later stage, during the operation of the equipment, the complex workflow of phase correction is eliminated. This article presents the principle and method of phase free calibration for S-band single channel measurement and control equipment,and verifies the effectiveness of the proposed method through experiments.
PDF
96
43
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
