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JUICE/RPWI/MFR

JUICE/RPWI/MFR. W. Kurth & D. Kirchner RPWI Team Meeting Uppsala, 9-11 May 2012. JUICE MF Receiver. 22.5MHz. 1MHz LPF. 14 Bit A/D. 1kHz HP. RTAX4000. Gain SW. 1MHz LPF. 14 Bit A/D. 1kHz HP. Gain SW. 512KX32 SRAM. 14 Bit A/D. 1MHz LPF. 1kHz HP. Gain SW. Serial I/F. FPGA.

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JUICE/RPWI/MFR

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  1. JUICE/RPWI/MFR W. Kurth & D. Kirchner RPWI Team Meeting Uppsala, 9-11 May 2012

  2. JUICE MF Receiver 22.5MHz 1MHz LPF 14 Bit A/D 1kHz HP RTAX4000 Gain SW 1MHz LPF 14 Bit A/D 1kHz HP Gain SW 512KX32 SRAM 14 Bit A/D 1MHz LPF 1kHz HP Gain SW Serial I/F

  3. FPGA Serial I/F A/D Controller WvFE Core Control State Machine Pseudo-PROM Memory Controller

  4. Operating Scenarios • Cassini HFR-like serial interface • Very low impact interface • Simplifies packaging • What requirements are there for data time-tagging? • RBSP Data bus interface • Tight integration required with host processor

  5. Self-contained processing • Use FPGA gates for PROM • Simplifies interface, lowers requirements on host flight software • Patches still available as in Cassini HFR

  6. Digital Daughter Board 22.5MHz Serial Rcvr 1.5 Pass Xstor RTAX4000 Serial Xmtr Voltage Ref 1.8 Pass Xstor 32x512K

  7. Power • Derive Memory and RTAX core voltages from 3.3V line • Less efficient but lower impact to interface • If available, ~2V core voltage supply could be used to lower the power dissipated in linear regulator • Run Analog from +/-6 • Switch the analog power to Receiver Board • Assuming a 3.3V logic interface

  8. RH1498 @ 2.5maX2 5 packages = 25ma@12v=300mW RH1013 @.6maX2 4 packages = 4.8ma@12V= 60ma RHF1401 3 packages@ 50mw average 150mW Xstal Osc 50mw RTAX standby 150mw Mem standby 20mW Serial I/O 50mW Power

  9. Power Profile ~1 sec ~2W ~4 sec ~1W ~0.5W baseline

  10. Top View 21.5cm Juno (could fit on 14.8x21cm) 16.5cm

  11. Side View 3cm Mass Estimate 600g without housing

  12. MFR Processing • Data capture • FFT • Bin & average (quasi-log spectrum) • Waveform compression (for waveform mode)

  13. MFR Calibrations • Primary calibrations occur prior to launch • Establish Vin – Vout relationship • Determine frequency response • Desire data in cruise (if possible) and during Earth flyby to evaluate performance, compare to other instruments • In-flight calibrations will involve establishing electron density (and temperature) consistency with measurements by other means (LP, particle instruments, etc.)

  14. Antenna Interface To RPWI To RPWI SSR Matching RPWI Hi-Z Preamp RPWI Hi-Z Preamp To SSR Switching between SSR and RPWI done with fault tolerant switch matrix controlled by spacecraft

  15. Juno Electric Preamp • 50Hz-45MHz front end with output split into three bands with individual attenuators • High amplitude capability (5V/M Decametric, 70V/m VxB at spin rate) • High radiation tolerance • Qualified to 400krads (could have gone higher) • Components tested to 1Mrad

  16. Juno preamp cont’d • Power 1.5W +.5W heater power • Power utilization impacted by high amplitude capability and multiple output drivers

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