FIELD OF THE INVENTION
The present invention represents the display and analysis of the critical aircraft
parameters in a more meaningful form. Actual data is recorded in flight data
recorders in raw form. Now there is a requirement of calibration files to get the
details information out of these recorded values. The calibration files, which
consists of max and min values against the corresponding raw count. Along
with that, these conversion formulas may be linear or non-linear as per
parameter’s behavior.
BACKGROUND OF THE INVENTION
The downloaded A/c parameters are analyzed in tabular format using the
recorded raw count (hexadecimal format). It represents the parameter variation
against the time from 0 to 4095 (if data is recorded in 12 bit format).
So it is found very difficult to interpret the actual value of parameters as per raw
count. So generally one uses database files for conversion of raw to decimal,
which contains the maximum and minimum value against the max and main
raw count if it is linear.
In case, we have non-linear variation against raw count, then we use different
formula to get the engineering value of parameter. It may be linear or quadratic
or some other equation of higher power. But the main aim is to get the actual
value.
SUMMARY OF PRESENT INVENTION
In accordance with one aspect of present invention is to provide data in
realistic format.
In accordance with another aspect of present invention is to get the violation
report of downloaded data as per maximum and minimum values defined in
database file.
In accordance with another aspect of the present invention is to provide the
detail analysis about the linear and non-linear calibration of aircraft parameters.
In accordance with another aspect of the present invention is to get an idea
about the criticality level of the A/c parameters.
In accordance with another aspect of the present invention is to provide
information about underperformance or failure of any of the A/c parameters.
In accordance with another aspect of the present invention is to get detail
view about the parameter performances.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1: It shows graphical variation of the recorded raw counts against the
engineering values of a parameter which has been calibrated in linear form.
Figure 2: It shows graphical variation of the recorded raw counts against the
engineering values of a parameter which has been calibrated in non-linear
form.
Figure 3: It shows the Block Diagram of the calibration method.
DETAILED DESCRIPTION
In flight Data recorder, the A/c parameters and Audio data, both are recorded
against time parameter. That is why this time parameter is used as common
base for this present invention. Here we plot the A/c parameters in either
tabular or graphical format against time and recorded audio data is
decompressed against the same time variation. Here we use the following kind
of calibration algorithm:
1) Linear variation of parameters:
RAW COUNT ENGINNERING COUNT
0 -90
500 -60
1000 -30
1500 -5
2000 0
2500 5
3000 30
3500 60
4095 90
2) Non-Linear variation of parameters:
RAW COUNT ENGINNERING COUNT
0 0
500 10000
1000 10000
1500 20000
2000 22000
2500 30000
3000 30000
3500 60000
4095 60000

WE CLAIMS:-
Accordingly, the description of the present invention is to be considered as illustrative only and is for the purpose of teaching those skilled in the art of the best mode of carrying out the invention. The details may be varied substantially without departing from the spirit of the invention, and exclusive use of all modifications which are within the scope of the appended claims is reserved. We Claim

1. This procedure has been developed to get the original data out of recorded one through sensors.
2. This feature is useful in representing any parameter value in its original form.
3. This feature provides a better picture about the recorded data during post flight analysis when we try to analyze the violation report or summary report.
4. This feature can be very much helpful for Pilot and Co-Pilot training purposes.
5. This purpose can be helpful in new system design in order to get rid of any parameter violation while data recording.
6. This feature provides the actual picture about the different critical aircraft parameters along with more realistic units.
7. This feature is very much useful in designing of highly critical devices. ,TagSPECI:As per Annexure-II