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11.2 Accuracy Determination To assess a radar system using Figure 1, several aspects shall be determined: a) The systems that produce the radar data used for separation or deconfliction shall
be assessed (369).
b) For a remote secondary surveillance radar (SSR) used in conjunction with a local primary the following errors shall be assessed: i) Error in slant range correction, if applied (370). ii) Error in prediction of position due to differing scan rates (427). iii) Error due to the curvature of the earth when transferring the centre of one
volume to another centre (428). iv) Stability and accuracy of original plots (429). v) Tolerance error in detected position of site marker (430). vi) Provision of SSR and/or Primary marker (431). vii)Allowable error in combination box (432).
viii)The plot delay shall be acceptable in respect of the Operational Requirement (OR) (433). This assessment shall consider both the mean delay and the distribution of the delay (434).
11.2.1 Recommendation: The error in range and bearing between: a) The aircraft position reported by SSR and primary radar (435). b) The reported SSR monitor position and the video map (436). c) The reported SSR monitor position and the known monitor position (437). should be less than ± 2 degrees in azimuth and ± 3% of target range.
11.2.2 Recommendation: The maximum time in store for the radar data should not exceed the time taken for 90 degrees of aerial rotation (438).
11.3 Plot extractor effects
11.3.1 The algorithm chosen to determine the centre and run time of the target shall be defined and justified (439).
11.3.2 The effect of the plot extractor on resolution and the accuracy error budget together with theoretical justification shall be defined (440).
NOTE: This is not necessary where the intention is to use the SSR purely as an overlay for height separation purposes.
11.3.3 The processing precision shall be sufficient to meet the error budget for the system accuracy and resolution (441).
11.3.4 If plot processing is used (i.e. to decrease the effect of garbling and reflection) any effect on detection shall be defined and justified (442).
11.3.5 The position of the radar relative to the coverage volume desired shall be justified (443).
NOTE: If the radar head is not at the centre of the desired cover the error may differ in each sector.
11.3.6 The distribution of any misalignment errors between two sensors shall be justified (444).
11.3.7 Where two sensors are not co-sited (for example, assigned services) the analysis shall include the position conversion error (445).
11.4 Radar System Beamwidth
11.4.1 A system beamwidth plot ±10 degrees of bore-sight or 40 dB down on peak power, whichever the plot reaches first, shall be developed (446).
11.4.2 In systems that rely on multiple beam patterns, the plot shall show the interaction of the beam patterns (447).
11.4.3 In systems that have user adjustable beamwidth, methods recommended for the assessment of changes shall be stated (448).
11.4.4 Recommendation: Demonstration of the beam patterns should be carried out on a test range (449).
11.4.5 The effect of beamwidth on accuracy, resolution, system loading and garbling shall be defined and justified (450).
11.5 Rotation Rate
11.5.1 The effect of rotation rate on system performance shall be defined and justified (451).
11.5.2 A primary radar providing the positional data for the following services shall rotate at the following effective minimum turning rates: a) General TMA Zone and approach work, a rotation rate of 5 RPM (452). b) SRA to 2 NM, a rotation rate of 10 RPM (453).
c) SRA to 1 NM, a rotation rate of 15 RPM (454).
d) SRA to 0.5 NM, a rotation rate of 20 RPM (455).
12 Resolution
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本文链接地址：CAP 670 Air Traffic Services Safety Requirements 2(84)
