andré larsen r&d director memscap sensor solution · hastac is carried out with financial...
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HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
HASTACHigh stability Altimeter
SysTem for Air data Computers
André LarsenR&D Director
Memscap Sensor Solution
SIXTH FRAMEWORK PROGRAMMEPRIORITY 4
Aeronautics and Space
EC contract no. AST4-CT-2005-012334
www.hastac.biz
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
HASTAC project outcomeHASTAC will develop:
A uniqe MEMS basedsensor with excellentlong term stabilityA hermetic sensor package optimised for aerospace applicationsAn optimised altimeter pressure transducerA new digital ADUDemonstration of theperformance in a rotary wing test fligth
Technology for a better society
Project factsTotal cost: 2.895.000 €Funding: 1.500.000 €Duration: 35 monthsStart date: 11 Jan 2005
Project webwww.hastac.biz
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
Strategic objective To increase the safety in all in-flight situations, particularly low visibility situations, by improving the transducers used in Air Data Computers for aircraft applications.
Improved aircraft performance1. Auto pilot situations in the reduced vertical separation
minima legislation of 1000ft (RVSM)2. Demanding manual flying situations in darkness and low
visibility3. Increased reliability in altitude information for manual and
automated Air Traffic Control systems used in transponder applications
4. Aircraft Traffic Collision Avoidance Systems will also benefit from more accurate and reliable altitude information
Why
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
Sensor element•Long term drift factors•Modelling, simulation & design•Process development•Fabrication & prototypes•Test & characterisation
Sensor package•Theoretical study•Design & pilot production•Assembly of pilot batch•Test & qualifications
Transducer•Concept & feasibility•Design of prototypes•Development & optimisation•Industrial prototypes•Test & certification
Air Data Computer•Technical specifications•Design of hardware & software•Pilot batch manufacturing•Performance test•Safety of flight qualification
Aircraft flight test•Flight test program•Helicopter installation•Ground testing•Safety of flight qualification•Test flight•Data analysis
Project consortium
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
WP3 TP4000This Work Package aim to make a high end transducer for
the new SP83 sensor
High accuracy and stability better than 0.01%fs/year
The program includes optimization of:Excitation methodNoise to signal ratioCalibration processCalibration method and technique
Activities:DO-254 proceduresQualification and testing
Deliverables :Engineering prototype to WP4Industrial prototype to WP4
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
TP2000Units
Low cost version of TP4000:Single ADCSP82Faster calibrationEasier compensation
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
TP4000Input to design
Increased focus on safety and reliability
Dual ADC based on experience with TP2000 and FTA
Evaluate methods for calibration
Large storage capacity to achieve higher accuracy in compensation method
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
TP4000Usage of TP2000 experience
TP4000
TP2000
SPI
Power
Temperature
Pressure Sensor
Excitation
AD7793
EEPROM
Reference, regulator, filter, protection
External system
AD7794 Pressure
Temperature
PB
PB PB TB
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
TP4000Difference from TP2000
Additional built in test during power-up:Verify AD7793 by using AD7794Use AD7793 to verify AD7794Verify drift in pressure bridge versus temperature bridgeVerify sensor excitation
In addition:More than double sample rate versus TP2000Possibility for synchronised pressure and temperature conversionLoss of function probability (MTBF) only ~5% worse than TP2000Misleading information probability (FTA) ~100% better than TP2000
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
CalibrationHow it worksProcedure:
Apply pressures and temperaturesCollect ADC dataCurve fit to referenceWrite constants to unit and verify
Temperature (left) and pressure (right) versus time for calibration and verification
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
Curve fit methodsData from a representative TP2000 (110767)
260 curve fit methods were compared
High order Chebyshevpolynomials have most potential
Chebyshev FTaylor FTaylor FFourier PChebyshev PChebyshev PChebyshev PChebyshev PType
-0.08800.0575H-0.06970.0327G-0.05720.0295F-0.02510.0151E-0.00380.0142D-0.00350.0142C-0.00400.0047B-0.00360.0039AMinMaxID
Deviation (%FS)Equation
P=polynomialF=function
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
TP4000Calibration procedure
T ADC80 points
P ADC25 points
Chebyshev curve fit
Bilinearinterpolation matrixgeneration
Measured data:• T ADC• P ADC• P Ref xx coefficients
Write to TP4000(8.2kB)
Improved curve fit and constants:
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
Matrix size vs max deviation
TP2000 110767
TxP=80x25
→ D<0.005%
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
TP4000Safety featuresThese features ensure safe operation of the TP4000:
Voltage regulator with high, low and reverse polarity protectionRegulator low power supply voltage detectionHardware lock input for write protection of EEPROMESD protection devices
These features can be implemented in external system for safety:Error detection on EEPROM communication by CRCError detection on ADC communication by multiple readRange checks on ADCs and calculated outputs (pressure, temperature)Communication timeout for loss of function detectionVerify ADCs against each otherVerify sensor excitationVerify drift of sensor bridge (temperature)
New from TP2000 to TP4000
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
TP4000Target Specification
Parameter Min / Typical Max Unit Power-supply 6.5* 20 V Current consumption 5* mA Pressure range (absolute) 50 1150 mBar Overpressure 200 % FSO Total pressure error (absolute) ±0.02** % FSO Long term stability (at ambient temperature) ±0.01** % FSO / year Pressure resolution <0.00005* % FSO Output noise ±0.001* % FSO Conversion time 25* ms Response time 50* ms Total temperature error < ±1* °C Temperature resolution <0.0002* °C Calibration temperature range -40 80 (105***) °C Operating temperature range -40 105* °C
* Estimate based on experience from other pressure transducers.** Estimate based on expected effect of improved calibration procedure and new SP83.*** Larger temperature range possible. This can influence the accuracy.
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
New generation of silicon MEMS barometric pressure sensors and fully compensated and digitized Transducers (TP4000)
Sensor systems with significantly improved altitude accuracy capabilities over time, target is better than 100ppm/year (0.01%/year)
Aircraft flight testing will demonstrate the effectiveness of the improvement
The new generation of transducers with a new silicon micro sensor (absolute pressure sensing element) as the key component, will also be available for other application areas, such as transponders and cabin pressure control systems.
How
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
WP 1 Sensing elementMiNaLab facility
Clean room area:SINTEF: 800 m2
University of Oslo: 600 m2
A full silicon processing line for MEMS and radiation detectorsCapacity of 10.000 6”wafers/year Located at the campus of University of Oslo240 MNOK investeted in scientific equipment and laboratory infrastructure
Technology for a better society
WP 1 Sensing elementLong term drift factorsModelling, simulation & designProcess developmentFabrication & prototypesTest & characterisation
HASTAC is carried out with financial support from the European Community FP6 Research Area 4 – Aeronautics & Space
ADU and Flight testNext generation air data unit development
Primarily to integrate HASTAC transducerElectronic interfaceSoftware interface
Optimise design of interfacesEvaluate performance in lab simulated environment over extended time period
Flight testExpose ADU and transducers to representative real life environmentSevere vibration environment experienced on helicoptersHigh hours utilisation on emergency services helicopterMonitor transducer performance during evaluation period and beyond