Simple download service (Atom) of the dataset: 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类无线电地役权（radio easements）是用于保护航空导航设施（air navigation facilities，含机场导航与着陆设施、国家气象接收中心以及无线电波束）的无线电地役权。
其适用规范与PT1、PT2类地役权一致。地役权的作用空间场（spatial field，即其适用的地理区域）即为该空间范围。该空间场可采用二维（2D）或三维（3D）定义，针对机场净空地役权（airport clearance easements）、无线电传输中心保护地役权（easements to protect radio transmission centres）等特定场景尤为如此。
本数据集涵盖主净空区（primary clearance zones）、次净空区（secondary clearance zones）、特殊净空区（special clearance zones）以及净空区域（clearance areas）。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：
次净空区：2000米；
环绕航空安全设施或无线电测向中心（radiogoniometric centre）的主净空区：400米；
环绕上述以外其他中心的主净空区：200米；
净空区域：5000米。
保护两点间无线电链路（radio link）的特殊净空区，其垂直于无线电波路径轴线（axis of the radio wave path）方向的最大宽度，在无线电波束椭球（radio beam ellipid）两侧均不得超过50米。实际应用中，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。保护无线电跟踪站（radio tracking station）或导航站（navigation station）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额外增加不超过1度的安全裕度（safety margin）。