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IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney | 2
- The KEA GNSS receiver
- Receiver architecture
- RF Down-converters
- Design Challenges
- Results
RF Des esign for GNSS rec ecei eiver ers Kevin Parkinson - - PowerPoint PPT Presentation
RF Des esign for GNSS rec ecei eiver ers Kevin Parkinson - - PowerPoint PPT Presentation
RF Des esign for GNSS rec ecei eiver ers Kevin Parkinson Contents The KEA GNSS receiver Receiver architecture RF Down-converters Design Challenges Results | 2 IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney Kea V4.1SB
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IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney | 3
Kea V4.1SB Receiver Module
- Credit card sized
- SmartFusion2 SOC
– Large flash based FPGA with 50k or 80k logic elements and enhanced SEU immunity – Powerful 166 MHz ARM Cortex M3 processor
- 512 Mb of SECDED LPDDR SDRAM
- 8 MB of serial Flash
- 8 kB of FRAM (ferromagnetic RAM)
- CMOS RF ASIC capable of L1/E1 operation
- Super-capacitor powered RTC
- Support for disciplined VC-TCXO and reference frequency output
- USB2 interface for debugging and data-capture
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IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney
Typical GNSS Receiver
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IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney
RF Down converter ASIC
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IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney
Design challenges
Paramater Affected performance Noise figure System sensitivity & Signal-to-noise ratio Frequency plan Image rejection & Interference rejection IF Topology Noise, Imgage rejection & Intermodulation distortion LNA type Signal-to-noise ratio & Intermodulation distortion Mixer type VCO leakage, Signal-to-noise ratio & Intermodulation distortion VCO leakage Local interference & Intermodulation distortion IF bandwidth Image rejection, Selectivity & Interference rejection VCO Phase noise Signal-to-noise ratio Intermodulation Signal-to-noise ratio & Dynamic range Dynamic range Sensitivity & Interference tolerance Power consumption Signal-to-noise ratio & Dynamic range Cross modulation Signal-to-noise ratio & Dynamic range Linearity Signal-to-noise ratio & Interference tolerance
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IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney
Single frequency ASIC
- 4 to 24MHz BW
- 60 dB AGC
range
- 2 Bit ADC
- 75dB Gain
- 3.9dB NF
- 4 or 12MHz IF
- 32MHz sample
2 Bit A/D
IF AMP
Synthesiser and PLL
AGC REF INPUT MIXER
/2 vco
LNA
SPI Control
MAG SIGN RF IN SPI IF
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IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney
Dual Frequency ASIC
- 32 MHz BW
- 60 dB AGC
range
- 3 bit ADC
- 75 db Gain
- 6.9 db NF
- 16 MHz IF
- 32 MHz
sample
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IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney
Single frequency results
Parameter L5/E5a L2 L1 Frequency 1176.45 MHz 1227.6 MHz 1575.42 MHz NF 3.9dB 4dB 7dB Gain 75dB 74dB 75dB VSWR In 1.5:1 1.45:1 1.52:1 Power 0.6W 0.6W 0.6W IP3
- 17dB
- 17.5dB
- 18dB
PN 100KHz
- 107dB/Hz
- 110dB/Hz
- 117dB/Hz
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IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney
Dual frequency results
Parameter L5/E5a L2 L1 Frequency 1176.45 MHz 1227.6 MHz 1575.42 MHz NF 6.9dB 6.8dB 7dB Gain 75dB 74dB 75dB VSWR In 1.5:1 1.5:1 1.5:1 Power 1W 1W 1W IP3
- 17dB
- 17.5dB
- 18dB
PN 100KHz
- 94dB/Hz
- 95dB/Hz
- 97dB/Hz
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IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney
L1/E1 IF out
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IG NSS 201 6, 6-8 Dec 201 6, UNSW,Sydney
L5/E5 IF out
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