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LOW COST RADAR 2012 CERF PROJECT

LOW COST RADAR 2012 CERF PROJECT. ERIC WALTON OSU/ESL JULY 2012. CERF; LOW COST RADAR A/D CONVERTER. MEASUREMENT COMPUTING USB-7202 ONE A/D PER CHANNEL UP TO 8 SIMULTANEOUS INDEPENDENT RANGE SETTINGS 16-BITS USB POWERED. 100 KS/S CUMULATIVE RATE (IE; 50 KS/S EACH CHAN. FOR TWO ETC.)

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LOW COST RADAR 2012 CERF PROJECT

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  1. LOW COST RADAR2012 CERF PROJECT ERIC WALTON OSU/ESL JULY 2012

  2. CERF; LOW COST RADARA/D CONVERTER • MEASUREMENT COMPUTING USB-7202 • ONE A/D PER CHANNEL • UP TO 8 SIMULTANEOUS • INDEPENDENT RANGE SETTINGS • 16-BITS • USB POWERED • 100 KS/S CUMULATIVE RATE • (IE; 50 KS/S EACH CHAN. FOR TWO ETC.) • SIMULTANEOUS SAMPLING • DOUBLE SPEED IN BURST MODE (32 K INTERNAL FIFO) $399

  3. CERF; LOW COST RADAR Frequency Synthesizer • WindfreakSynthNV module • based on the Analog Devices wideband fractional-N synthesizer chip (with integrated VCO) • Analog Devices ADF-4350 • This mixed-signal chip can output signals in the 137-4,400 MHz range. • This chip has enabled a number of very low cost modules to be developed. • Our cost was $574. This module is very simple to set up and use. • The USB port controls the device as well as providing power. • signal output port • RF reference signal input port available as option. • power sense port • The optional reference signal input port can be used for setting up several units coherently. • The power sense port can be used to measure a received signal level, a • nd thus this small unit can independently be used as a scalar network analyzer. • The internal microprocessor can be programmed to operate independently by setting it to a particular frequency and power level. • It can even be programmed to perform a step frequency scan automously. Photo of WindfreakSynthNV module

  4. BASED ON ANALOG DEVICES ADF 4350Wideband synthesizer with integrated VCO

  5. CERF; LOW COST RADAR I/Q Mixer (DEMODULATOR) There are a large number of UWB mixers available, • Most require associated components (amps for LO and LP filters and amps for the IF output. • We wanted to operated down to DC. • We selected the Polyphase Microwave quadrature demodulator as a compromise between cost and performance. • Bandwidth from 0.5 to 4.0 GHz with built in LO amplifier and I/Q low pass filters. • Characteristics; • LO/RF freq. 500-4,000 MHz • I/Q bandwidth DC-275 MHz (50Ω) • Input IP3 +30 dBm • Input P1 +12 dBm • Amp. Imbal. +/- 0.05 dB • Phase Error +/- 0.5 Deg. • LO Power +0 dbm • DC supply +/- 5 VDC This unit was purchased and tested using bench top laboratory equipment and was found to meet specifications. The unit was offered to The OSU ESL at an educational discount price of only $918.75. A photo of the unit is given in figure 7. $918.75. Polyphase Microwave Inc.; 1111 W 17TH ST, STE 200 Bloomington, IN 47404

  6. CERF; LOW COST RADAR

  7. CERF; LOW COST RADAR TESTING RESULTS 1-12 GHz ridge-waveguide UWB horns 0.5-4.4 GHz 3 DB SPLITTER SYNTH USB I I/Q MIXER A/D 3.25 AND 5.88 INCH DIAMETER SPHERES Q USB COMPUTER

  8. CERF; LOW COST RADAR IN PHASE AND QUADRATURE COMPONENTS VS. FREQUENCY EXAMPLE RESULTS FOR 5.88 IN. DIA. SPHERE

  9. CERF; LOW COST RADAR

  10. CERF; LOW COST RADAR Green = no-target data Blue = raw sphere data Red = sphere data divided by thru data DB FREQUENCY (MHZ)

  11. CERF; LOW COST RADAR FULL TIME SCALE Coupling in pow. Divider (thus negative time) DB TIME DOMAIN (ns)

  12. CERF; LOW COST RADAR DB TIME (ns) NOTE; background subtraction suppresses the room clutter (background) by more than 30 dB. Normalization to the “thru” connection removes the effects of system and cables. (IE: moves the response from 11.2 ns to 4.2 ns. {antennas and propagation distance remain})

  13. CERF; LOW COST RADAR We can also do this for the 3.25 in diam sphere

  14. CERF; LOW COST RADAR 6. Acknowledgements The authors wish to thank The Ohio State University ElectroScience Laboratory Consortium on Electromagnetics and Radio Frequencies (ESL-CERF) (sponsors of this project) as well as Polyphase Corporation for their assistance.

  15. BACK-UP • BACK UP SLIDES;

  16. CERF; LOW COST RADAR

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