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For 3 NM separation the equipment shall resolve two targets at 1 NM separation and for 5 NM separation the equipment shall resolve two targets at 3NM, both to a probability of 95% or greater throughout the required azimuth and range as defined in the OR (456).
NOTE:  It is likely that any areas not meeting this figure are the result of the relative location of the Radar Sensor to the traffic pattern. Such degradation can only be permitted if special rules are proposed for the separation of traffic for these areas.
13  Coverage
13.1  General
13.1.1  Coverage defines the areas that can support the provision of radar services to aircraft as defined in CAP 493 Manual of Air Traffic Services Part 1. These areas shall be in the OR (457).
13.1.2  The radars shall have a theoretical coverage, in the areas of the OR, which corresponds to 80% detection of the returns from a 1m2 target. This increases to 90% for areas providing SRA procedures. For primary targets this theoretical cover shall assume Swerling case 1 targets (458).
NOTE:  This coverage requirement applies to both primary and SSR sensors if separation standards or deconfliction minima between primary, reinforced and SSR only plot positions are applied.
13.1.3  Primary and SSR sensors shall have their performance continuously monitored (459). An alarm shall be raised when coverage cannot be met (460).
13.1.4  Where the use of the primary radar system includes SRA approaches the coverage shall be suitable for the termination distance (461).
13.1.5  Recommendation: The radar service coverage should extend as shown in Figure 2 (462).
13.2  SSR Coverage
13.2.1  For services that use SSR for separation or deconfliction purposes a formal coverage specification shall be constructed (463).
NOTE:  Where the provision of the SSR service is for an overlay only service, to aid target identification, no formal coverage specification is required.
13.2.2  The output power of SSR or primary radar shall not exceed the approved level (464).
13.2.3  For the secondary radar system details of the link power budget shall be defined (465). This link budget shall show that the system achieves coverage in both range and elevation (466).
13.2.4  Where interrogation side lobe suppression (ISLS) is used, the amplitude of P2 shall be between 0dB and +3dB above the nominal greatest sidelobe level (467). The amplitude of P2 shall be greater than 9dB below the nominal level of P1 in the main beam (468).
13.2.5  Where improved interrogation sidelobe suppression (IISLS) is used, in addition to the requirements of 12.2.4, the level of P1 shall be within 3dB of P2 (469).
13.2.6  The control channel response shall be greater than 3dB above the response of the interrogator channel outside the nominal boresight angle for receiver sidelobe suppression (RSLS) (470).
13.2.7  The pulse spacing shall comply, where appropriate, with Section 3.1.1.4 and Section
3.1.2 of ICAO Annex 10, Vol. IV, Chapter 3 (471).
13.2.8  Where the equipment uses reflection suppression, the effects of this on system performance shall be defined and justified (472).
13.2.9  The de-garble capacity and performance of SSR extractors for the amount of traffic and the separation standard or deconfliction minima required shall be justified (473).
14  Data Handling Requirements
14.1  Data Storage Capacity
14.1.1  The OR shall consider the required processing load in terms of: a) The number of aircraft targets expected (474). This shall be based on overall load and sector peaks (475). This load shall include all targets within the coverage of the
sensor (476).
b) The worst case weather conditions (477).
c) Any roads within the radar coverage (478).
d) Any fixed clutter patterns (479).

14.1.2  During operational trials the equipment shall monitor the processor and memory loading distribution of each sub-system (480).
　
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