GNSS RNAV

Rabat, 16/27-03-2015

Target:

Learn basic concept on area dimensioning referred to GNSS sensor .

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GNSS RNAV

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Part 1: General Part 2: XTT, ATT and area semi-width

Part 3: Values

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PAN OPS Reference

Part III – Section 1 – Chapter 2

PAN OPS Vol II Sixt Edition

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General Concept

GNSS positioning is apllicable to the following navigation specifications:

RNAV 5

RNAV 2

RNAV 1

RNP 4

RNP2

RNP-1

Advanced RNP

RNP 0.3

RNP APCH

The following slides provide the cross-track and along-track parameters for GNSS used as input to the procedure construction criteria

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TSE (1/2) The Total System Error TSE is dependent from position estimation error (SIS error and airborne receiver error), path definition error, display error and flight technical error.

The TSE is used to define the XTT and ATT as follows:

XTT= TSE and ATT=0.8 TSE

The RNP specification define lateral TSE as follows:

RNP4: The lateral TSE and the along-track will not exceed ±7.4Km (4NM) for at least 95% of the total flight time.

RNP2: The lateral TSE and the along-track will not exceed ±3.7Km (2NM) for at

least 95% of the total flight time.

RNP-1: The lateral TSE and the along-track will not exceed ±1.9Km (1NM) for at least 95% of the total flight time.

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TSE (2/2) Advanced RNP: XTT and ATT will not exceed the applicable accuracy for the phase of

flight: oceanic/remote: ±3.7 km (2.0 NM) continental en route: ±3.7 km (2.0 NM) or ±1.9 km (1 NM) departure, arrival, initial, intermediate, missed approach: ± (0.56 km (0.3 NM) to

1.9 km (1 NM)) with a 0.19 km (0.1 NM) increment final approach: ±0.56 km (0.3 NM)

for at least 95 per cent of the total flight time. RNP 0.3: The lateral TSE and the along-track error will not exceed ±0.56 km (0.3 NM)

for at least 95 per centof the total flight time.

RNP APCH (LNAV and LNAV/VNAV only). The lateral TSE and the along-track error will not exceed ±1.9 km (1 NM) 95 per cent of the total flight time during the initial and intermediate segments of the approach and during the missed approach.

The lateral TSE and the along-track error will not exceed ± 0.56 km (0.3 NM) 95 per cent of the total flight time during the final approach. RNP APCH criteria shall only be applied within 56 km (30 NM) of the destination ARP. Outside this distance, either the RNAV 1 or RNP-1 criteria should be applied.

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XTT and ATT for Navigation Specification

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Area semiwidth ½ A/W=1.5 XTT + BV

where:

1.5 XTT corresponds to a 3σ lateral TSE value

BV = buffer value

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Values (1/4) RNAV5 similar to Europe B-RNAV to be used for enroute phase

RNAV1 and 2 for terminal procedure (Radar Coverage and full ATS service)

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Values (2/4) RNP 4 - 2 for enroute phase with limited ATS service

RNP-1 for terminal phase (STAR/SID) with limited ATS service

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Values (3/4)

RNP APCH to be used for approaches (RNP AR APCH with DOC 9905)

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Values (4/4) Advanced RNP in all phases of flight

RNP 0.3

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Navigation Specifications – GNSS Infrastructure TSE

XTT, ATT and area semi-width

Values

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