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Comparison of Static Pressure from Aircraft Trailing Cone Measurements and Numerical Weather Prediction Analysis

Giez, Andreas and Mallaun, Christian and Zöger, Martin and Dörnbrack, Andreas and Schumann, Ulrich (2016) Comparison of Static Pressure from Aircraft Trailing Cone Measurements and Numerical Weather Prediction Analysis. 32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 12-17 June 2016, Washington, DC, USA. DOI: 10.2514/6.2016-3707

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Official URL: http://arc.aiaa.org/doi/abs/10.2514/6.2016-3707

Abstract

Accurate static pressure measurements are a prerequisite for safe navigation and precise air data measurements on aircraft. Pressure is also fundamental to assess winds and air temperature and, hence, important for meteorology. The direct static pressure measurement by aircraft is disturbed by the aircraft aerodynamics and needs to be corrected using proper calibration. In this paper we compare static pressure measured by means of a trailing cone (TC) in the undisturbed atmosphere behind two different jet aircraft (Dassault FALCON 20E and Gulfstream 550 “HALO”) at flight levels (FL) from 40 to 450 during 6 flights on different days with data from numerical weather predictions (NWP). The height is derived from differential Global Navigation Satellite System (GNSS) measurements. The GNSS height is compared to NWP geopotential height. The NWP data were provided by the Integrated Forecast System (IFS) of the European Centre for Medium-Range Weather Forecasts (ECMWF). The IFS model assumes constant gravity g. For constant g, the pressure differences (at same height) have mean values and standard deviations of 0.40±0.17 hPa for 159 individual measurements of 43±31 s duration each. The respective height differences (at same pressure) are -10±5 m on average over the same measurements. When computing the geopotential with latitude/height dependent gravity (which is 0.4 % smaller at FL 450 than at 0 km) the agreement becomes significantly better: -0.01±0.15 hPa for pressure, 0.6±2.8 m for height. This pressure accuracy implies NWP temperature errors <0.1 K on average below 10 km altitude. Standard deviations of random errors in the TC-NWP difference are 0.06 hPa and 1 m. The TC measurements provide a first quantification of the case-specific accuracy of NWP pressure geopotential relationships. The method of comparing operational pressure/GNSS measurements on aircraft with NWP analysis or predictions can be used to test the height keeping performance of aircraft after or during operation.

Item URL in elib:https://elib.dlr.de/104718/
Document Type:Conference or Workshop Item (Speech)
Title:Comparison of Static Pressure from Aircraft Trailing Cone Measurements and Numerical Weather Prediction Analysis
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Giez, AndreasDLR, FXUNSPECIFIED
Mallaun, ChristianDLR, FXUNSPECIFIED
Zöger, MartinDLR, FXUNSPECIFIED
Dörnbrack, AndreasDLR, IPAUNSPECIFIED
Schumann, UlrichDLR, IPAhttps://orcid.org/0000-0001-5255-6869
Date:15 June 2016
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2016-3707
Page Range:pp. 1-18
Status:Published
Keywords:pressure trailing cone numerical weather prediction NWP calibration
Event Title:32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference
Event Location:Washington, DC, USA
Event Type:international Conference
Event Dates:12-17 June 2016
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Flugexperimente > Flugversuchstechnik OP
Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Schumann, Prof.Dr.habil. Ulrich
Deposited On:04 Jul 2016 09:38
Last Modified:31 Jul 2019 20:01

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