| 摘要 |
A secondary surveillance radar system combines a mechanical scanning type of mode-S sensor using a mechanical rotation type of antenna and an electronic scanning type of mode-S sensor using an electronic scanning type of antenna. The mechanical scanning type of mode-S sensor performs at least mode-A/C general inquiry/response with aircraft targets and create a file of surveillance data obtained by the general inquiry/response. This allows circumvention of problems, which would be encountered in performing the same processing by using the electronic scanning system, such as the deterioration of accuracy of monopulse angular measurement, the increasing probability that unwanted responses will be received, etc., which are due to the elevation dependence of horizontal beamwidths. The electronic scanning type of mode-S sensor performs at least mode-S individual inquiry/response, reducing the time interval allotted for the general inquiry/response, thereby permitting an increase in data link communications capacity, and real-time communications.
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