Goddard Space Flight Center Summer Tasks on UAV

Goddard Space Flight Center Summer Tasks on UAV Radar Under supervision of: Shannon Rodríguez Lihua Li Gerry Heymsfield Manuel A. Vega-Cartagena UPRM Graduate Student Manuel A. Vega-Cartagena

Objective 2 l NASA IDEAS-ER grant received. l Develop a background on radar design while contributing to the UAV project. Manuel A. Vega-Cartagena

UAV Radar Project 3 l The planned radar will have capabilities of ER-2 Doppler Radar (EDOP). l Nadir beam for vertical winds and precipitation structure. l Conical beam for ocean surface winds and surveillance of the precipitation regions of the storm. Manuel A. Vega-Cartagena

Tasks 4 l Study radar literature. l Redesign UAV’s nadir sub-system RF front end block diagram. l Help bench test UAV’s conical sub-system Tx and Rx paths. l Design 80 MHz/5 MHz clock PCB. l Design a PCB for UAV’s Vicor power modules. Manuel A. Vega-Cartagena

UAV’s RF Front End Block Diagram l 5 Requirements – Magnetron frequency = 9. 345 GHz – Intermediate frequency = 60 MHz – Calibration noise injection loop – Receiver noise figure calculations Manuel A. Vega-Cartagena

UAV’s RF Front End Block Diagram 6 Manuel A. Vega-Cartagena

80 MHz / 5 MHz PCB l 7 Requirements – Single 10 MHz sine wave input. – 80 MHz and 5 MHz 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. Manuel A. Vega-Cartagena

80 MHz / 5 MHz PCB Clock Block Diagram: 8 Manuel A. Vega-Cartagena

80 MHz / 5 MHz PCB l PCB Construction – – Board schematic and layout done with Orcad software. Built using router in building 22. D-Sub 15 Sense Lines SOIC Components Mezzanine Connectors 9 Manuel A. Vega-Cartagena

80 MHz / 5 MHz PCB l Board Testing – – – 10 CPCISYS carrier board with daughter card. Only DC Power from carrier board used. Still undergoing debugging process. Manuel A. Vega-Cartagena

80 MHz / 5 MHz PCB ~1. 3 V l Test Results – 11 80 MHz Clock Signal ~0. 4 V Manuel A. Vega-Cartagena

80 MHz / 5 MHz PCB ~1. 6 V l 12 5 MHZ Clock Signal SMA ~0. 1 V Manuel A. Vega-Cartagena

80 MHz / 5 MHz PCB l Sensing Lines – – – 13 Two additional lines were added. Two inverting amplifier stages. Gain values were changed. Manuel A. Vega-Cartagena

80 MHz / 5 MHz PCB l – – – 14 Sense Line Output Voltage (Vpp) Voltage Gain 1 19. 53 1. 953 2 20. 31 2. 031 3 19. 53 1. 953 4 19. 53 1. 953 Sense Lines Tested using 10 Vpp 1 k. Hz sine wave. Theoretical voltage gain value = 2. 25. Gain variations may be caused by tolerance in resistances. Manuel A. Vega-Cartagena

Vicor Power Modules PCB l 15 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(+/- 5 V, +/-12 V, +/15 V). Manuel A. Vega-Cartagena

Vicor Power Modules PCB l Design Schematic – 16 Power modules PCB. l Voltage selection jumper and output. l Wire connections elimination. l Bypass capacitors. l Chassis ground connection. Manuel A. Vega-Cartagena

Vicor Power Modules PCB l PCB Construction – Maximum load currents calculation. l Imax l l – Components selection. l 17 = 5 A @+24 VIN for 5 V module. 12 V and 15 V modules have lower output currents. Track widths for 10°C temperature increase = 110 mils. Track clearances for +28 V = 29 mils. Entire design done using standard low-cost 1 oz. Cu thickness board. Connectors with unexposed contacts. Manuel A. Vega-Cartagena

Vicor Power Modules PCB l Finished Board +28 V Input Output and Voltage Selection Jumper 18 Chassis Ground Manuel A. Vega-Cartagena

Vicor Power Modules PCB l Power Distribution Matrix – – Used to eliminate barrier block. Makes output voltages more accessible and easy to change. To Components From Aircraft To Power Modules From Power Modules 19 Manuel A. Vega-Cartagena

Vicor Power Modules PCB l Finished Board From Power Modules From Aircraft To Power Modules To Components 20 Manuel A. Vega-Cartagena

Vicor Power Modules PCB l 21 Final Configuration Manuel A. Vega-Cartagena

UAV’s Conical Sub-System Tx and Rx Paths Testing l 22 Task performed to gain hands-on experience. Manuel A. Vega-Cartagena

Learning Experience l Radar Theory Background – – l PCB Design – – l 23 RF Front End Design Power Requirements ORCAD Routing machine Design Implementation Manuel A. Vega-Cartagena

Conclusions l Goals achieved! – – l 24 80 MHz/5 MHz daughter card PCB developed Power Modules PCB design developed Gained valuable hands-on experience. Manuel A. Vega-Cartagena

Questions 25 Manuel A. Vega-Cartagena

List of Acronyms l l l 26 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 Manuel A. Vega-Cartagena

Acknowledgements l l l 27 Shannon Rodríguez / 555 Lihua Li / 912 Gerry Heymsfield / 613 Wai Fong / 567 Gerry Mc. Intire / 613 Manuel A. Vega-Cartagena