T8 (Radio Reception Centres) Areas and Disengagement Areas in Corrèze

N_AERONAUTIC_RADIOELEC_T8_019 T8 easements are radio easements for the protection of air navigation facilities (airport navigation and landing facilities, national meteorological receiving centres and radio beams). They are covered by the same texts as easements PT1 and PT2. The attitude of an easement is the spatial field (i.e., the geographical area) within which the easement applies. This space field can be defined either in 2D or in 3D in particular in the specific cases of airport clearance easements, easements to protect radio transmission centres. The base includes primary clearance zones, secondary clearance zones, special clearance zones and clearance areas. The maximum distance between the limit of a radio centre and the perimeter of the easement areas shall not exceed: 2 000 metres in the case of a secondary clearance zone; 400 metres in the case of a primary clearance zone surrounding an aeronautical safety facility or a radiogoniometric centre; 200 metres in the case of a primary clearance zone surrounding a centre other than those mentioned above; 5,000 metres in the case of a clearance area. The maximum width of a special clearance zone protecting a radio link between two fixed points counted perpendicularly to the axis of the radio wave path shall not exceed 50 metres on either side of the radio beam ellipid. In practice, the beam is assimilated to a band and the plate will not exceed 50 m on either side of the axis. The maximum width of a clearance area that protects a radio tracking or navigation station shall not exceed the width of the angular area explored by the station, increased, where appropriate, by a safety margin of not more than one degree beyond the two limits of that area.N_AERONAUTIC_RADIOELEC_T8_019 T8地役权是用于保护航空导航设施（机场导航与着陆设施、国家气象接收中心及无线电波束）的无线电地役权。 其适用规范与PT1、PT2类地役权一致。地役权的空间覆盖范围（即地理区域）即为该权利的生效范围。该空间场域可通过二维或三维方式定义，针对机场净空地役权、无线电传输中心保护地役权等特殊场景尤为如此。 本数据集涵盖一级净空区、二级净空区、特殊净空区及净空区域。无线电中心边界与地役权区域边界之间的最大距离不得超过以下限值： 二级净空区：2000米； 环绕航空安全设施或无线电测向中心的一级净空区：400米； 环绕上述以外其他中心的一级净空区：200米； 净空区域：5000米。 用于保护两点间固定无线电链路的特殊净空区，其垂直于无线电波传播轴线的最大宽度，在无线电波束椭球两侧均不得超过50米。实际应用中，无线电波束可等效为带状区域，其轴线两侧的宽度均不得超过50米。用于保护无线电跟踪或导航站的净空区域，其最大宽度不得超过该站探测的角域宽度，必要时可在该区域的两个边界外增加不超过1度的安全裕度。