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5.2 Radio Link
5.2.1 Where radio links are used, the 'line of sight' path of the link shall be safeguarded (786).
5.2.2 Recommendation: Radio links should not cross active runways, taxi-ways, railways or roadways. This is due to the change of path characteristics in the presence of aircraft or large service vehicles (787).
5.3 Data Integrity
The possibility of integrity errors arising during any reformatting by the encoder or conversion of the data at a data link interface shall be determined (788).
5.4 Interference
5.4.1 The effects of pick-up of false signals including radio frequency interference, magnetic and electrostatic fields shall be determined (789).
5.4.2 Recommendation: The occurrences of false targets should not exceed once per revolution (790).
5.4.3 Recommendation: Error detection and correction algorithms should be used to check for data corruption (791).
5.5 Status Indications
5.5.1 The system shall provide warning indications for line loss and system status (792).
5.5.2 Recommendation: The equipment should send to the remote user all data link fault reports and warnings that are sent to the local user (793).
NOTE: This includes the status of the radar data link equipment and the status of the radar providing the radar information.
5.6 Reconfiguration of Remote Services
Procedures shall be in place that require the remote supplier to supply details to the recipient of any optimisation or planned outages of the source radar system that may affect the supplied data (794). Any changes shall be assessed formally to determine the effect on the OR (795).
NOTE 1:It is likely that the owner of the remote service will optimise the system for their own purposes.
NOTE 2:Approval may be required before these changes are implemented or used operationally.
6 Link Data Format, Rate and Capacity
6.1 Correct operation of all data transformations shall be tested under all data formats used (796).
6.2 Data Format and Overflow
6.2.1 Recommendation: It is recommended that the format of data control messages follows the proposed ASTERIX EUROCONTROL Standard (PES) SUR.ET1.ST05.2000-STD-01-01 (797).
6.2.2 The system shall be capable of detecting an overload situation on the link (798). The system shall provide information that allows the display or other system to advise the controller of this situation (799).
NOTE 1:The overload detection system may be manual or automatic. A typical manual system would require the controller to log the number of data overload warnings. A typical automatic system would monitor the number of digital words on the link or messages queued on the link.
NOTE 2:The digital data link may be used for transmission of other data such as telephone traffic or CCTV. In such circumstances the plot load assessment should consider all these services.
6.3 Data Capacity
The link bandwidth shall be determined and shown that it has sufficient capability of transmitting the data required to satisfy the OR (800).
7 Link Distortion and Effect on Accuracy
7.1 Video Signal Stability
The offset drift and dynamic range of the link shall be compatible with the data level (801).
7.2 Link Delay
The worst case data delay through the system shall be defined and be justified as being acceptable (802).
FLI 03 Flight Trial Requirements for Surveillance Systems
Part 1 Preliminary Material
1 Introduction
Surveillance systems require flight trials testing to be carried out before an Air Navigation Order (ANO) Article 205 Approval can be granted (803). The following document details the requirements for such flight trials.
2 Scope
This document applies to all surveillance sensor equipment providing data for an aerodrome Air Traffic Service (ATS) and requiring approval under Article 205 of the ANO.
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CAP 670 Air Traffic Services Safety Requirements 2(102)
