In-Flight Performance Analysis of Direct RF Sampling Architecture Applied to VHF Band Avionics

Transcription

1 In-Flight Performance Analysis of Direct RF Sampling Architecture Applied to VHF Band Avionics A. Q. Nguyen, A. Amrhar, A. A. Kisomi, X. Fang, R Jr. Landry IEEE Aeroconf th March, 2018 Session 4.13

2 Contents 1. Introduction 2. DRFS Avionics Implementation 3. Flight Test Scenario 4. Performance Analysis 1. VOR 2. LOC/GS 3. VHF Radio 5. More DRFS Avionics 6. Conclusion 2

3 1. INTRODUCTION 3

4 1. INTRODUCTION 1.2 AVIO-505 Objectives Advantages : Less equipment and cables Hardware to software redundancy Software function reallocation Easier maintenance Lower cost 4

5 1. INTRODUCTION 1.2 AVIO-505 DRFS Avionics Conventional architecture LO Mixer IF Filters ADC DDC DDC : Digital Down Converter IF : Intermediate Frequency Increase Size, Weight, Power, and Cost (SWaP-C) efficiency ADC DDC Antenna + Filters IF Stages Pre- Processing Unit DRFS architecture General Purpose Processing Unit Avoid problems related to LO Mixer and IF stages ADC Mixer DDC Can be compatible with Integrated Modular Avionics and maximizing resource sharing... Antenna + Filters + Combiner Mixer DDC FPGA Pre-Processing Unit General Purpose Processing Unit (GNU Radio) Objective: Study the feasibility, capacity, and advantages of a DRFS avionic architecture in RX and TX (VHF avionics as the preliminary targets) 5

6 1. INTRODUCTION 1.3 RX Principles: Bandpass sampling 6

7 1. INTRODUCTION 1.4 TX Principles: FIR/CMIX Before DAC 7

8 2. DRFS AVIONICS IMPLEMENTATION 8

9 2. DRFS Avionics Implementation 2.1 Overview Studied/Implemented Avionics Architecture Overview Integrated Avionics in the Main system: 8 Applications in RX: 2 VORs, LOC, GS, 2 VHF Radios, Marker Beacon, ACARS (Configurable) 4 Applications in TX: ACARS VHF Radio (Digital - Analog ELT) (2 at a time - Configurable) 9

10 2. DRFS Avionics Implementation 2.2 SDR-FPGA and GPP FPGA design with MATLAB/Xilinx (SDR Platform) SDAM modules in the GNU Radio (GPP) 10

11 2. DRFS Avionics Implementation 2.3 COTS components for the Flights 11

12 2. DRFS Avionics Implementation 2.4 In-lab Performance Validation IFR-4000 System Requirements Standard DRFS Performance USRP A-Q. Nguyen et al., 2017, "Integrated Avionics Frequency Tracking In Direct RF Sampling Front-End Using FFT, ICNS, USA. A-Q. Nguyen et al., 2017, New architecture of Direct RF Sampling for avionic systems applied to VOR and ILS, Radarconf, USA. A-Q. Nguyen et al., 2017, Direct RF Sampling Transceiver Architecture Applied to VHF Radio, ACARS, and ELTs, DASC, USA. VOR Localizer Glide Slope VHF Radio RX Sensitivity 93 dbm 94 dbm Dynamic Range 66 db 69 db Sensitivity 82 dbm 78 dbm Dynamic Range 49 db 54 db Sensitivity 76 dbm 82 dbm Dynamic Range 43 db 57 db Sensitivity 87 dbm 81 dbm SNNR 25 db with input level between 61dBm and 27 dbm 25 db with input level between 70 dbm and 20 dbm 12

13 3. FLIGHT TEST SCENARIO 13

14 3. Flight Test Scenario 3.1 Flight test summary Conducted Flights Installation 14

15 3. Flight Test Scenario 3.2 Flight test phases N CYHU YJN 15

16 4. PERFORMANCE ANALYSIS 16

17 4. Performance Analysis 4.1 VOR 1 3 rd Flight Test (10/2016) 5 th Flight Test (5/2017) Progressively improved results (3 o standard) 17

18 4. Performance Analysis 4.2 VOR 2 and Summary 5 th Flight Test (5/2017) VOR Summary Parameters Theory/Standard DRFS Performance Capacity 1 Max Range VOR 1 Sensitivity VOR 2 Sensitivity 55 to 83 NM (Altitude 2000 to 3000 ft) 93 dbm (95% valid results) 93 dbm (95% valid results) 2 (in parallel, with 1 ADC) Max 30 NM (only 6 db gain from LNA) 92 to 93 dbm (97% valid results) 92 to 94 dbm (94% valid results) 18

19 4. Performance Analysis 4.3 ILS In-Flight LOC Value: ~0.3 o Right G/S Value : ~0.7 o Up Indicator LOC and G/S display in UGC 19

20 4. Performance Analysis 4.4 LOC (From Flight No. 5 at CYMX) Standard Approach Non-standard approach 20

21 4. Performance Analysis 4.6 GS and Summary Glide Slope Errors for the Standard Approach (Flight No. 5) LOC/GS Summary Parameters Theory/Standard DRFS Performance LOC Range 25 NM (within 10 o course) ~ 8 NM LOC Input Level 33 to 82 dbm 65 to 88 dbm LOC Accuracy GS Range 95% valid results 8 NM (within 8 o centerline) ~ 32% (Auto Landing) ~ 70% (Manual Landing) ~ 4 NM GS Input Level 33 to 76 dbm 75 to 92 dbm GS Accuracy 95% valid results ~ 70% valid results 21

22 4. Performance Analysis 4.7 VHF Radio 4 th Flight Test: VHF Radio Recorded (4/2017) 2 VHF Radio in the same ADC with VOR and ILS CYHU CYJN Recorded Audio/SNR analysis with MATLAB Parameters Capacity Max Range DRFS Performance 2 (in parallel, along with other systems) ~ 12 NM 22 SNR VHF Radio Summary 3 db for an understandable output

23 5. MORE DRFS AVIONICS 23

24 5. More DRFS Avionics ADS-B and others ADS-B In: 5 Msps ADC 250 MHz sampling rate Digital Mixer Digital Mixer AGC AGC CIC/FIR CIC/FIR Amplitude UAT In: 5 Msps GPP UAT In at 978 MHz (Fold 7 times) ADS-B In at 1090 MHz (Fold 8 times) 62 MHz for other applications 32 MHz 0 22 MHz 90 MHz 24

25 6. CONCLUSION 25

26 6. CONCLUSION 6.1 Conclusion Feasibility: Multi-avionics in one platform RX: 2 VORs, LOC/GS/Marker Beacon, 2 VHF Radio, ACARS (8 in parallel) TX: ELT MHz, ELT MHz, ACARS, VHF Radio (2 in parallel) Simplicity: 1 GPP with SDR, 1 SDR platform. Configurability High Performance: Meet MOPS and Flight tested Efficiency: SWaP-C Constraints Expandability: ADS-B/UAT ELT Detector 26

27 6. CONCLUSION 6.2 Future work (Recommendation) High Performance ADC/DAC: 1 GHz ADC or higher, 16 bits resolution. Less folding Higher SNR Increase resolution Increase the sensitivity Multiple sampling rate for ADCs in 1 SDR platform High Q filters and standardized RF analog modules Verifications Flight tests in commercial airplanes. 27

28 Related Publications [1] A.-Q. Nguyen, A. A. Kisomi, A. Amrhar, and R. J. Landry, "Integrated Avionics Frequency Tracking In Direct RF Sampling Front-End Using FFT," presented at the 2017 Integrated Communication, Navigation and Surveillance Conference (ICNS), April 2017, [2] A.-Q. Nguyen, A. A. Kisomi, and R. Landry, "New architecture of Direct RF Sampling for avionic systems applied to VOR and ILS," in 2017 IEEE Radar Conference (RadarConf), 2017, pp [3] A.-Q. Nguyen, A. A. Kisomi, A. Amrhar, and R. J. Landry, Direct RF Sampling Transceiver Architecture Applied to VHF Radio, ACARS, and ELTs, in 2017 IEEE/AIAA 36rd Digital Avionics Systems Conference (DASC),

29 AVIO-505 Project DRFS Avionics Merci Beaucoup! Thank you! Anh-Quang Nguyen Contact us at: