The azimuth separation is, for traditional magnetron and pulse compression radars, directly linked to the antenna size. Recommendations to separation requirements for similar sized, point targets is given by Table 210 and Figure 14 . Table 210 Azimuth Separation Recommended requirements for azimuth separation of small point targets X-Band Radar S-Band Radar Local Port Basic Standard Advanced Standard Advanced Services dB dB dB dB dB dB Plot Plot Plot Plot Plot Plot points points points points points points -6 -6 -6 -6 -6 -6 separation separation separation separation separation separation Azimuth separation in angle as presented to the VTSO 1.6 3.2 1.0 2.0 0.6 1.2 0.5 1.0 2.4 4.8 1.5 2.9 (in °) Or distance, whichever is 35 50 25 40 20 30 15 25 20 30 15 25 the greater (in m) Maximum corresponding antenna horizontal 1.00 0.70 0.45 0.40 2.00 1.25 -3dB beam width (in °) Calculated in metres this gives the following results: Figure 14 Azimuth Separation Note that the definition of azimuth separation has been further refined compared to previous editions of this recommendation; however, expectations to radar performance remain unchanged Separation of Larger Targets Beyond the separation of point targets, the VTS authority is recommended to express target separation requirements in operational terms rather than radar subsystem parameters. For larger (non-point) targets and for separation of dissimilar sized targets, the definition of separation is highly dependent on physical size, aspect angles, relative return amplitude, pulse stretch, and other radar characteristics. System capability should be assessed by live testing of predefined scenarios, as modelled or predicted performance can give misleading results.
The azimuth separation is, for traditional magnetron and pulse compression radars, directly linked to the antenna size. Recommendations to separation requirements for similar sized, point targets is given by Table 210 and Figure 14 . Table 210 Azimuth Separation Recommended requirements for azimuth separation of small point targets X-Band Radar S-Band Radar Local Port Services Basic Standard Advanced Standard Advanced -6 dB points Plot separation -6 dB points Plot separation -6 dB points Plot separation -6 dB points Plot separation -6 dB points Plot separation -6 dB points Plot separation Azimuth separation in angle as presented to the VTSO (in °) 1.6 3.2 1.0 2.0 0.6 1.2 0.5 1.0 2.4 4.8 1.5 2.9 Or distance, whichever is the greater (in m) 35 50 25 40 20 30 15 25 20 30 15 25 Maximum corresponding antenna horizontal -3dB beam width (in °) 1.00 0.70 0.45 0.40 2.00 1.25 Calculated in metres this gives the following results: Figure 14 Azimuth Separation Note that the definition of azimuth separation has been further refined compared to previous editions of this recommendation; however, expectations to radar performance remain unchanged Separation of Larger Targets Beyond the separation of point targets, the VTS authority is recommended to express target separation requirements in operational terms rather than radar subsystem parameters. For larger (non-point) targets and for separation of dissimilar sized targets, the definition of separation is highly dependent on physical size, aspect angles, relative return amplitude, pulse stretch, and other radar characteristics. System capability should be assessed by live testing of predefined scenarios, as modelled or predicted performance can give misleading results.