FIELD OF THE INVENTION
The present invention relates to Ground Support Equipment, particularly for avionics
FDR system. It is for conversion of data from one format to other in an efficient way.
The data consists of different type of signals like Analog, Discrete, Tacho, Thermo,
ARINC 429, MIL 1553B etc. All these signals have different position in the frame. In
conversion these signals are placed at the correct location so that they can be correctly
analyzed on a common analysis tool.
BACKGROUND OF THE INVENTION
Generally used FDR systems in an aircraft which stores data and the data downloaded
from it can only be analysed on a particular Ground Support Equipment having fixed
type of data format which is different from what various GSE requires as an input for
replaying thus making it specific to a particular GSE. This leads to the invention of a
conversion tool which could convert recorded data in another format also so that it could
be analyzed on the existing tool and all different type of GSE tools also.
SUMMARY OF PRESENT INVENTION
In accordance with one aspect of present invention is to provide re - arrangement
of different types of signals like Analog, Discrete, Tacho, Thermocouple, ARINC429,
and MIL1553B at different locations.
In accordance with second aspect of present invention is to provide different bit
wise operation to arrange the bits in a byte in required format.
In accordance with another aspect of present invention is to provide different byte
wise operations to arrange bytes of a word in the required format.
Annexure‐II
The present invention is particularly concerned with mapping of data
corresponding to Analog, Thermo, RTD, Tacho and Enabling / Disabling of Digital bus
(ARINC429 & MIL 1553B) signals from one format to another format.
BRIEF DESCRIPTION OF THE DRAWINGS
The features and advantages of the present invention will become more apparent and
descriptive in the description when considered together with figures/flow charts
presented:
Part 1 of Figure 1: This is the downloaded sortie from an FDR.
Part 2 of Figure 1: In this, converter removes the an setup and config file and adds the
compatible setup and config file to be used for further mapping
Part 3 of Figure 1: In this, converter keeps track of start and end address of all majors.
These majors are processed one by one for mapping. Majors are basically repetitive
format of data with respect to time.
Part 4 of Figure 1: In this, mapping of all types of signals is done in step of major.
Part 5 of Figure 1: In this, newly formatted majors are written in a file in hex form. This is
the required file compatible with a common analysis tool.
DETAILED DESCRIPTION
The mapping of downloaded data from an FDR to another GSE readable format is
required to use the common testing analysis facility. An FDR’s sortie file downloaded is
given as input to converter to make in another required format. The Setup File has fixed
length in bytes of an FDR and is generally skipped from the input file while reading the
file for conversion. The compatible Setup of fixed length in bytes is written in the Output
File. Searching logic for Extraction of start and end location of Major ID has been
changed. The start address and end address of each major has calculated and written
in index file. Majors are extracted one by one from Input file using same index file
mentioned in Step 4 for further processing.
As per the engineering concept of compatible Sortie File it has been found that the
checksum for the first major and the half second frame count for all majors remains zero
Annexure‐II
so this has been taken care of while writing the Major ID, Checksum and half second
frame count in the output file.
Time stamp that comes after half second frame count is taken as it is from input file and
stored in the buffer of current Major being processed. The buffer is size of major
currently being processed. Audio data, Mil1553B data and miscellaneous data is taken
as it is from the input file and stored in the buffer of current Major being processed.
From the analysis of the compatible Sortie File it has been found that Label is bitwise
reversed comes before data for ARINC which has been taken care of by writing the
ARINC Data after swapping the required bytes and also reversing the required byte
bitwise.
For the sampled data Analog Channels and Discrete Ports is mapped as per the
Database, which has been made as per the compatible Sortie File. The compatible
Sortie File provides details regarding classification of ARINC and the same has been
reflected in the updated setup and configuration.
After the current major has been gone through above processing steps, means
all types of data has been mapped or processed, the buffer containing this data is
written to the compatible file. For all majors, above steps are repeated till the end of
data to be converted, finally the Compatible File is ready for used by common ground
i.e. Testing & Analysis tool.

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. The frame format of aircraft data, comprising:
- Analog, Discrete, Tacho, Thermo, ARINC 429 and MIL 1553 data from aircraft sensors,
- A host PC to run the converter application,
- A setup and configuration file to control sampling rate of signals,

can be converted to another form with fixed identifiers architecture and can be played on different GSE’s.

2. The system according to claim 1, further comprising of
- Databases file to get correct location of Analog, Discrete, Tacho, Thermocouple, ARINC429 and MIL1553B data.

3. The system according to claim 1 & 2, capable of arranging all type of data in required format of data. ,TagSPECI:As per Annexure-II