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14.1.3 Recommendation: The probability of 100% processing load in any sub-system should be less than 0.01 (481).
14.2 Data Precision
14.2.1 The data precision used shall be consistent with the positioning performance required from the system (482).
14.2.2 Recommendation: ASTERIX format is recommended for data interchange (483).
NOTE: ASTERIX format is mandated by EUROCONTROL for data interchange between centres.
14.3 Data Integrity
14.3.1 The system data shall achieve the operationally required level of integrity (484).
14.3.2 The equipment shall contain error detection systems to ensure appropriate data integrity during operation (485).
NOTE: An integrity loss has the effect of reducing the accuracy of the presented information.
14.4 Radar Source Identification
14.4.1 To ensure that any radar data processing equipment connected to the sensor can correctly identify the source of the data, the chosen data transmission standard shall support source identification (486).
14.4.2 Identification codes shall be unique (487).
NOTE: The allocation of identification codes is entirely at the discretion of the Applicant, with regard to the codes already in use in the system.
15 Surveillance Recording
See SUR 10 for surveillance recording requirements.
16 Default Parameters
All default values shall be stated (489).
NOTE 1:Default settings control such items as filter settings, clutter level defaults, fixed arithmetic offsets, feedback loops etc.
NOTE 2:This does not apply to arithmetic constants fixed in the equipment design.
17 Monitoring Requirements
17.1 All radar systems shall have methods available to determine the alignment (490).
17.2 For an analogue primary radar the system shall use appropriate video outputs to check the range/bearing error based on Permanent Echoes (PE) (491). The controller or maintenance engineer shall check such figures at suitable intervals (492).
17.3 The system shall identify at least three PE, each separated by more than 60 degrees (493). Each PE must be at a range greater than one third of the standard display range (494). In addition the separation of each PE from other permanent features must be at least 3 degrees in azimuth and ±0.5 nautical mile in range (495).
17.4 Where an analogue only channel is not provided and therefore PEs cannot be displayed, an active test target (MTI runway marker) shall be used for alignment checking (496).
17.5 The position of any active test target (MTI runway marker) shall be as near to threshold as practical (497).
NOTE: For systems that use SSR in conjunction with primary, there are further options. First, that the SSR system has an independent site monitor. Second, that there is a procedure in place to determine the collimation error between the secondary and the primary data. This procedure can take the form of the ATC operator checking the errors on screen, or equipment that checks the error. Such a check could be part of the Plot Assignor/Combiner equipment.
17.6 The SSR site transponder and monitoring system shall monitor those radar parameters which affect detection, performance, accuracy or resolution (498).
18 Remote Control and Monitoring System (RCMS)
18.1 Annex 11 to the International Convention on Civil Aviation (ICAO) requires that a procedure be in place that informs ATS units of the operational status of the equipment used for controlling take-off, departure and approach to land. The system shall report any failures that will put restrictions on the performance or abilities of the equipment (499). How the system achieves this shall be defined and justified (500).
NOTE: An electronic system or a procedural reporting method from the maintenance department or to ATC can be used.
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CAP 670 Air Traffic Services Safety Requirements 2(86)
