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5.6  Accuracy
Recommendation: The radar should establish the position of a target to within one quarter of the minimum visual feature size (760).
5.7  Mapping
Recommendation: The system should provide calibrated maps that indicate the
location of the following airport features:
a) Stop bars (761).
b) Block junctions used for holding airport traffic (762).
c) Runway LVP protected areas (763).
d) ILS critical areas (if relevant) (764).
e) Radio Site restriction areas (if relevant) (765).
f) Location of fixed obstructions (766).
g) Alignment marks (767).
h) The manoeuvring area (768).
i) Areas next to the manoeuvring area (769).

5.8  Information Rate
5.8.1  The information update rate shall be appropriate to the speed of airport traffic and the minimum visual feature size (770).
5.8.2  Recommendation: The aerial rotation rate should be at least 60 RPM (771).
5.9  Data Delay
Recommendation: The equipment should present the data to the controller within a period equivalent to one quarter of the revolution rate of the aerial (772).
5.10  Weather
5.10.1  The radar shall achieve the required performance in the worst weather in which routine operations are likely to continue (773).
5.10.2  Recommendation: The equipment should be specified to survive the '1 in 50 years' extremes of weather (774).
SUR 12  Airport Remote Radar Feeds Engineering Requirements
Part 1 Preliminary Material
1  Introduction
1.1  For the provision of particular radar data, for example, secondary surveillance radar (SSR), it may be appropriate to use shared data sources. This data is termed 'onward routed radar data'. Such data can be used, for example, to provide additional coverage.
1.2  The equipment used to convey this remote data from source to destination is termed a radar data link.
2  Scope
2.1  This document details the aspects that must be considered before installing a radar data link system.
2.2  The requirements apply to the following data elements: a) Target identification. b) Target position. c) Target type (where appropriate, for example vehicles, 'angels' etc.). d) System configuration information. This includes, as appropriate:
i) Selected polarisation.
ii) Radar channel selected.
iii) Pulse length selected.
iv) Radar antenna tilt.

e) Radar monitoring and fault indication.
Part 2 Requirements
3  Safety Objective
The remote radar feed shall provide complete and uncorrupted data so that the safety of the Air Traffic Service utilising it is not compromised (1718).
4  Radar Data Links General Requirements
4.1  General parameters The suitability of the link shall be assessed against the operational requirement (OR)
(775) and shall include the following aspects:
a) Link integrity and interference (776).
b) Link data rate and capacity (777).
c) Link distortion and effect on accuracy (778).
d) Link delay (779).
e) Link reliability (780).
f) Data resolution on link (781).

4.1.1  Recommendation: The actual performance as regards bit rate, bit error rate, transmission delay and availability should be defined and justified when compared with the required acceptable performance in the Operational Requirement (782).
5  Availability, Integrity and Interference
5.1  Availability
5.1.1  The availability of the equipment shall be defined and justifiable for the air traffic service being provided (783).
5.1.2  Recommendation: Duplicate data paths should be implemented to increase the availability (784).
5.1.3  Recommendation: A Failure Modes and Effect Criticality Analysis (FMECA) should be carried out to ensure that the design meets the overall reliability requirement set out in the OR (785).
　
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