“ THE LOCATOR ” R. F. LOCATION SYSTEM

1. TEAM ZISSOU presents…. “THE LOCATOR”R. F. LOCATION SYSTEM MIKE GOULDKARA MCMILLIN MARCUS PEARLMAN CHRIS SINKEY JACOB WILTGEN

2. R.F. Location Project Compass Design Transmitting Antenna • Transmitting Antenna • sends power signals Receiving Antennas Power Rectifier • Antenna arrays receive • power signal • Power is rectified and • amplified Amplifier • DC power signal is analyzed USB Interface 68HC11 Microcontroller • 2-D Location outputs to • Computer, LCD, or PDA • Bill Murray still confused.

3. Antenna Array Block Diagram Receive Antenna DC Converter Output: Direction A/D Microcontroller Transmitter 6 System Block Diagram Antenna 1 8 Antenna 2 8 8 Possibly: Construct Antenna 3 PC Location Algorithm Output: Display

4. Antenna Array Design λ/4(1/εr) 50 Ω line Digital Control pins Phase Shifters + Shottky Diode / Rectifier / Filter

5. Phase Shifter Pin-out

6. 10 deg 20 deg 0 deg 40 deg 30 deg Receiving Array: 5 Element Power Pattern

7. 0 deg 10 deg 20 deg 30 deg 40 deg Receiving Array: 7 Element Power Pattern

8. Rectification to Amplification: • 2.4-2.5 GHz Power Signal rectified immediately • Using a Schottky Diode: Surface Mount Low Barrier X-Band: MACOM part # MA4E2054 RF input On Antenna Board DC output To control Board • Schottky Diode output will be a low level DC Voltage (~mV) • Amplification must take place to guarantee proper A/D conversion: • Amplification using LF356 op-amp (easy, low noise, cheap)

9. Antenna Signal Filtering: • Design fc = 5kHz • Additional LPF with RC filter Implementing a LF356 op-amp to create a “Sallen-Key” Low Pass Filter

10. MC68HC11 A/D • One of 8 channels implemented (PE0: pin59) • OPTION control Register: on start-up • $1039 (enable A/D): • ADPU: A/D Power Up: (1) Enables A/D capabilities • CSEL: Clock Select Enable: (0) Use E Clock (2Mhz) • A/D Control/Status Register: (ADCTL) • $1030 (Define A/D parameters): __000000 • SCAN: Continuous Scan Control bit: (0) not used • MULT: Multiple-Channel Control bit: (0) single channel used • CD,CC,CB,CA: Channel Select Bits: 0000 = PE0

11. Processor, Bus Driver, and Latches

12. Chip Select, EPROM, SRAM

13. Antenna Control

14. Communication with Peripherals • RS-232 interface with user • Use a CAN bus to link antennas • A balanced, 2-wire interface running over a Shielded Twisted Pair • NRZ encoding reduces disturbances CAN bus RS-232

15. Software Executive • Main Loop • Task specific - latch data gathered on command • Subtasks • Read data on latches • Compare data from latches to determine highest power reading • Find a location with a simple distance algorithm: • Output visual display on a dummy terminal for user z Antenna 2 Antenna 1 ø * Know Z and ø, can find d d Transmitter

16. Updated Schedule:

17. Labor Division for 1st Milestone • Chris • Antenna designed and tested (including Shottky diode) • PCB board submitted for build • Jake/Kara • Control board running and tested (inputs and outputs) • Begin software implementation • Mike • Ordering phase shifter and Shottky diode • Amplifier designed and tested on control perf board • Marcus • Transmitter designed and tested • Wire-wrap the transmitter on a perf board

18. COSTS (EXPECTED) • Received $1191 from UROP 1191 • Phase Shifters cost -725 • Need 5 shifters per array = 5*2*72.50 • PCB boards 33.00*3 -99 • General supplies used thus far -100 • Wire wrap, resistors, caps, chips, etc. • Remaining funds = 267

19. Questions?