TITLE OF INVENTION
TEST EQUIPMENT FOR TESTING OF SENSOR DATA ACQUISITION AND VIDEO
SWITCHING UNIT OF AN AIRCRAFT.
FIELD OF THE INVENTION
The Test Equipment simulates analog, discrete, synchro and video signals (RGB
and YC) and performs the required functional testing of the UUT. It also performs the
required video switching of the different video sources (RGB and YC) through command
protocol on the RS 422 communication port.
BACKGROUND OF THE INVENTION
In any aircraft a large number of the sensors are mounted on it for different
purpose like for measuring altitude, air speed, angle of attack etc. All these sensors provide
different types of electrical outputs like analog, discrete and synchro etc. All these sensors
outputs are used for different purpose. For example these sensors data are used for
recording in Solid State Flight Data Recorder (SSFDR) for post flight/accidental analysis, for
recording in Health Uses and monitoring systems (HUMS) for monitoring the health of an
aircraft and display data on Multifunction Display System for pilot use.
The electrical output of the sensors needs to be converted into the digital data to
make it compatible for recording in SSFDR, HUMS and display on the multifunction display.
To convert the electrical signals into compatible format and switching the video signal a
Sensor data Accusations and Video switching Unit is installed in an aircraft. It is an aircraft
specific equipment to process discrete, analog & synchro inputs from a number of aircraft
sensors & equipment and converts them into compatible format for display on the Smart
Multifunction Display (SMD). In addition to these, it will also provide switching of various
types of video inputs to the Smart Multifunction Display (SMD) for display. This unit also
count the fuel pluses during the flight, based on which the amount of fuel consumed during
the flight is being calculated by the Smart Multifunction Display. This unit can be interfaced
with up to 2 display units (i.e. SMDs). The Test Equipment has been developed in order to
test the above describe unit on the ground before putting it on to the aircraft.
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Annexure‐II
SUMMARY OF PRESENT INVENTION
In accordance with the design and development of Test Equipment for the
Sensor data Acquisitions and Video switching Unit, it is a USB based 8-slots compact data
accusation (cDAQ) with hot swappable input/output modules interface with the Industrial
laptop having Graphical User Interface (GUI).
In accordance with the design of the Test Equipment hardware consist the eight
slots backplane, in which the different module can be inserted to generate the analog and
discrete signals. All slots are hot swappable. The test setup also include the TV signal
generator for simulating the STANAG-B video (RGB and YC). Synchro simulator is being
used for simulating the Synchro signals. Test Equipment is also having the self test facility of
all the modules and chassis. Any failure in the modules or chassis will be reported by the
Test Equipment before further proceeding to test the unit. Graphical User Interface (GUI)
has been developed to control all the modules to generate the require signals/functionality.
Following signals and communication port are simulated by the Test Equipment:
• Discrete Output (28RTN/OC): 11 Nos
• Discrete Output (28VDC/OC): 29 Nos
• Analog Output (-5VDC to +5VDC): 02 Nos
• Analog Output (0VDC to +10VDC): 01 No
• Synchro Output: 02 Nos
• 28 VDC pulses (50ms Duration): 01 No
• Video Signals (RGB): 03 Nos
• Video Signals (YC): 02 No
• RS 422 Port: 02 Nos
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1: Block Diagram of Sensor Data Acquisitions and Video switching Unit (SDAVSU)
Figure 2: Block Diagram of the Architecture of Test Equipment of SDAVSU
Annexure‐II
DETAILED DESCRIPTION
The Test Equipment is capable of simulating the various signals like analog,
discrete, Synchro and video etc. The Unit under Test (UUT) receive the electrical signals
simulated by the test equipment and perform the signal conditioning with the help of
processors reside in the UUT. Electrical signals are finally converted into HEX data by the
UUT. UUT consist the RS 422 interface on which it transmit the sensors data in HEX format
after processing on the request by SMDS or Test Equipment through RS 422.
The processed data in HEX format received from the UUT through RS 422 is
converted into engineering value by the Test Equipment with the help of applicable
conversion formula and same is compared with simulated value and checked for tolerance.
The Fuel pulses of 28V DC of 50ms duration is simulated by the test equipment. Five pulses
of 28VDC are simulated by the Test Equipment and same is fed to the UUT. UUT counts
these pulses and send the number of count to the Test Equipment after getting the request
for same from Test Equipment. Simulated pulses and counted pulses by UUT are compared
and PASS/FAIL result is displayed on the screen.
Two types of video signals RGB (3 Channels) and YC (2 channels) of STANAGB
standard are simulated by the Video signals generator. Signal generator can generate the
different kind of video pattern. The video pattern generated by the signal generator is fed to
the UUT. Command is send from Test Equipment through RS 422 port to switch the
particular input channel of the video to particular output channels. The switching command
consist the information regarding input and output video channels. Operator/User has to
visually verify the video out put of switched channels on the video monitor.
Test Equipment is also having the test facility to perform the Buil-in-test of the
UUT. Test Equipment sent the command to UUT to perform the built-in-test through RS 422
port. UUT perform its BIT test and send the test result in HEX format to the test equipment.
Test Equipment decodes the HEX data and display the result of all major components.
Test equipment can also detect any of the faulty cards in the UUT. It can display
the health of all the individual cards of UUT. Detail test report can be generated in PDF
format with time stamping at the end of the testing.

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 that

1. The Test Equipment consists of following major module to simulate the functionality of the aircraft sensors.
a) 8 slot Chassis and IO cards (Analogs and Discrete cards)
b) Industrial Laptop
c) Synchro Simulator
d) Video signal Generator (STANAG-B)
e) USB to RS 422 Converter
f) Video Monitor
2. We claim that the Test Setup as per point no.1 simulate the following signals.
• Discrete Output (28RTN/OC): 11 Nos
• Discrete Output (28VDC/OC): 29 Nos
• Analog Output (-5VDC to +5VDC): 02 Nos
• Analog Output (0VDC to +10VDC): 01 No
• Synchro Output: 02 Nos
• 28 VDC pulses (50ms Duration): 01 No
• Video Signals (RGB): 03 Nos
• Video Signals (YC): 02 NO
3. Test Equipment can check the health of all individual modules of the UUT. It can declare the individual modules of UUT as PASS/FAIL based on its health.
4. Test Equipment has the facility to report the fault of the Unit under Test (UUT) through the LED indication.
5. Test Equipment is also used to upload the application program in the processor module of the UUT through RS 232.
6. Graphical User Interface (GUI) developed using Lab-View programming language to simulate and to carryout the functional testing of the UUT. ,TagSPECI:As per Annexure-II