summer tasks on uav radar
DESCRIPTION
Goddard Space Flight Center. Summer Tasks on UAV Radar. Under supervision of: Shannon Rodr í guez Lihua Li Gerry Heymsfield. Manuel A. Vega-Cartagena UPRM Graduate Student. Objective. NASA IDEAS-ER grant received. - PowerPoint PPT PresentationTRANSCRIPT
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Summer Tasks on UAV Radar
Under supervision of:Shannon RodríguezLihua LiGerry Heymsfield
Manuel A. Vega-CartagenaUPRM Graduate Student
Goddard Space Flight Center
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Manuel A. Vega-Cartagena2
Objective
NASA IDEAS-ER grant received.
Develop a background on radar design while contributing to the UAV project.
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Manuel A. Vega-Cartagena3
UAV Radar Project
The planned radar will have capabilities of ER-2 Doppler Radar (EDOP).
Nadir beam for vertical winds and precipitation structure.
Conical beam for ocean surface winds and surveillance of the precipitation regions of the storm.
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Manuel A. Vega-Cartagena4
Tasks
Study radar literature.
Redesign UAV’s nadir sub-system RF front end block diagram.
Help bench test UAV’s conical sub-system Tx and Rx paths.
Design 80MHz/5MHz clock PCB.
Design a PCB for UAV’s Vicor power modules.
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Manuel A. Vega-Cartagena5
UAV’s RF Front End Block Diagram
Requirements
– Magnetron frequency = 9.345 GHz
– Intermediate frequency = 60 MHz
– Calibration noise injection loop
– Receiver noise figure calculations
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Manuel A. Vega-Cartagena7
80MHz / 5MHz PCB
Requirements
– Single 10MHz sine wave input.
– 80MHz and 5MHz TTL clock outputs for DAQ card.
– Four amplified analog sensing lines.
– Low profile components.
– PMC daughter card format.
– Original circuit design done by Shannon Rodríguez.
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Manuel A. Vega-Cartagena8
80MHz / 5MHz PCB
5V
-5V
Frequency MultiplierAV9170
10 MHz10 MHz 40 MHz
Clock Block Diagram:
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Manuel A. Vega-Cartagena9
80MHz / 5MHz PCB
PCB Construction– Board schematic and layout
done with Orcad software.– Built using router in building 22.
MezzanineConnectors
SOICComponents
D-Sub 15Sense Lines
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Manuel A. Vega-Cartagena10
80MHz / 5MHz PCB
Board Testing– CPCISYS carrier board with daughter card.– Only DC Power from carrier board used.– Still undergoing debugging process.
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Manuel A. Vega-Cartagena11
80MHz / 5MHz PCB
Test Results– 80MHz Clock Signal
80MHz TTL Clock Signal
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
-1.50E-07 -1.00E-07 -5.00E-08 0.00E+00 5.00E-08 1.00E-07 1.50E-07
Time (s)
Volta
ge (V
)
~1.3V
~0.4V
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Manuel A. Vega-Cartagena12
80MHz / 5MHz PCB
5MHZ Clock Signal SMA5MHz TTL Clock Signal
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
-5.00E-07 -4.00E-07 -3.00E-07 -2.00E-07 -1.00E-07 0.00E+00 1.00E-07 2.00E-07 3.00E-07 4.00E-07 5.00E-07
Time (s)
Volta
ge (V
)
~1.6V
~0.1V
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Manuel A. Vega-Cartagena13
80MHz / 5MHz PCB
Sensing Lines– Two additional lines were added.– Two inverting amplifier stages.– Gain values were changed.
3
21
411
-
+
U1A
LM324/SO
5
67
411
-
+
U2B
LM324/SO
0 0
R1
R
R2
R
R3
R
R4
R
VinVout
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Manuel A. Vega-Cartagena14
80MHz / 5MHz PCB
Sense Lines– Tested using 10Vpp 1kHz
sine wave.
– Theoretical voltage gain value = 2.25.
– Gain variations may be caused by tolerance in resistances.
Sense LineOutput Voltage (Vpp)
Voltage Gain
1 19.53 1.953
2 20.31 2.031
3 19.53 1.953
4 19.53 1.953
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Manuel A. Vega-Cartagena15
Vicor Power Modules PCB
Requirements– Eliminate wire connections
between modules.
– Reduce mounting time.
– Only one board for both +/- voltage configurations.
– Output voltages should be accessible and easy to change(+/- 5V, +/-12V, +/-15V).
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Manuel A. Vega-Cartagena16
Vicor Power Modules PCB
Design Schematic– Power modules PCB.
Voltage selection jumper and output.
Wire connections elimination.
Bypass capacitors.
Chassis ground connection. 12
J1+28V
12
J2
GND
IN-
Gate
OUT
Gate
IN
IN+
OUT-
OUT+
-S
Trim +S
U1Vicor DC-DC Converter
-IN1
-Sin
2
+Sin
3
+IN
4
-OUT
9
-Sou
t8
NC7
+Sou
t6
+OUT
5
U2VI-RAM-I2
0
To Plate Screw
From Power Distribution Matrix
To Power Distribution Matrix
C1CAP
C2CAP
C3CAP
C4CAP
00
0 0
1 2 3 4
J3+/- OUT
0
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Manuel A. Vega-Cartagena17
Vicor Power Modules PCB
PCB Construction– Maximum load currents calculation.
Imax = 5 A @+24VIN for 5V module. 12V and 15V modules have lower output currents. Track widths for 10°C temperature increase = 110 mils. Track clearances for +28V = 29 mils. Entire design done using standard low-cost 1oz. Cu thickness
board.– Components selection.
Connectors with unexposed contacts.
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Manuel A. Vega-Cartagena18
Vicor Power Modules PCB
Finished Board
+28V Input
Chassis Ground
Output and VoltageSelection Jumper
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Manuel A. Vega-Cartagena19
Vicor Power Modules PCB
Power Distribution Matrix– Used to eliminate barrier
block.– Makes output voltages more
accessible and easy to change.
12
J4+5V
12
J5-5V
12
J6+12V
12
J7-12V
1 2
J8+28V
1 2
J9+28V
1 2
J10+28V
1 2
J11+28V
1 2
J12+28V
To Power Modules
From AircraftFrom Power Modules
0
0
NOTE: All voltages available at each connector.Total Components = 10
To Components
12
34
56
J13CON6A
12
34
56
J14CON6A
12
34
56
J15CON6A
12
34
56
J16CON6A
12
34
56
J17CON6A
From Aircraft
To Power ModulesTo Components
From Power Modules
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Manuel A. Vega-Cartagena20
Vicor Power Modules PCB
Finished BoardFrom Aircraft
To Power ModulesFrom PowerModules
To Components
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Manuel A. Vega-Cartagena21
Vicor Power Modules PCB
Final Configuration
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Manuel A. Vega-Cartagena22
UAV’s Conical Sub-System Tx and Rx Paths Testing
Task performed to gain hands-on experience.
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Manuel A. Vega-Cartagena23
Learning Experience
Radar Theory Background– RF Front End Design– Power Requirements
PCB Design– ORCAD– Routing machine
Design Implementation
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Manuel A. Vega-Cartagena24
Conclusions
Goals achieved!– 80MHz/5MHz daughter card PCB developed– Power Modules PCB design developed
Gained valuable hands-on experience.
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Manuel A. Vega-Cartagena25
Questions
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Manuel A. Vega-Cartagena26
List of Acronyms
UAV – Unmanned Air Vehicle IDEAS – Initiative to Develop Education through Astronomy
and Space Science DCAS – Distributed Collaborative Adaptive Sensing PCB – Printed Circuit Board TTL – Transistor-Transistor Logic
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Manuel A. Vega-Cartagena27
Acknowledgements
Shannon Rodríguez / 555 Lihua Li / 912 Gerry Heymsfield / 613 Wai Fong / 567 Gerry McIntire / 613