The Overview Report of S-band Ground Station Verification and Operation for Lean Satellite, HORYU-IV
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1 The Overview Report of S-band Ground Station Verification and Operation for Lean Satellite, HORYU-IV BONSU Benjamin, TATSUO Shimizu, HORYU-IV Project Members, CHO Mengu Kyushu Institute of Technology Laboratory of Spacecraft Environment INteraction Engineering (La SEINE) October 19, /19/2016 1
2 Contents 1. Introduction 2. About of HORYU-IV Lean Satellite 3. Overview of S-band Ground Station 4. On-Ground Ground Station Verification Test Results 5. HORYU-IV Operation Status Report 6. On-Orbit Ground Station Verification Test Results 7. Conclusions and Lesson Learned 10/19/2016 2
3 Introduction Lean - satellite; Small/micro/nano/pico satellite. Untraditional risk-accepting development methodology. Low-cost and fast-delivery. Lean-satellite mostly developed by universities : Launch into Low Earth Orbit (LEO) for educational and research purposes Utilize amateur VHF/UHF bands for space ground communication Utilize data throughput of 1200kbps and 9600kbps Limited time window of communication search?biw=1164&bih As universities Lean satellite missions becomes sophisticated demand for higher data throughput and higher frequency for space ground communication are arising 10/19/2016 3
4 About HORYU-IV Project HORYU-IV Team 10/19/2016 4
5 Launch Date: 17 th February 2016 About HORYU-IV Lean Satellite Launch Time:17:45:34 JST Launched by : JAXA, H2A-202 rocket Altitude:575km Inclination:31 degrees Main Mission : To acquire images of discharge occurrence phenomenon on the experimental solar panels onboard 10/19/2016 5
6 HORYU-IV S-band Communication Requirements Schematics of HORYU-IV S-band communication subsystem Data Speed Transmitter:100kbps Receiver : 38kbps - 100kbps Center Frequency S-band : GHz Bandwidth 140kHz or more S-band Transmitter Power: 0.5W 10/19/2016 S-band Patch Antenna +X axis view 6
7 Overview of S-band Ground Station 10/19/2016 7
8 Components of S-band Dish Antenna system Developed and Installed by ELM and Microlab Comapnines 10/19/2016 8
9 System Diagram of S-band Ground Station Configuration ROOFTOP CONTROL ROOM Optical to RF convertor S-band Receiver Ethernet Hub Tracking PC Reception PC 10/19/ m S-band Parabolic Dish Antenna System RF Male N-type connector GHz Optic line Ethernet line 9
10 On-Ground S-band Ground Station Verification Results 10/19/
11 Environmental Interference Test Wi-Fi, Mobile Phones, WiMAX radio networks 26 meters Location: General Research Building 1 rooftop Monitoring interference signal 10/19/
12 Environmental Interference Results Results Interference signal Required operating frequency range ( GHz GHz) Interference signal 10/19/
13 Long Distance Communication Test (Before HORYU-IV launch) S-band ground station location Transmitter antenna Transmitter station location (Sarakura Mountain) Team at Sarakura Mountain Simulated distance of 2600km (path loss 168.3dB) 10/19/2016 S-band Dish antenna pointing Sarakura Mountain 11
14 Results Required operating frequency range ( GHz GHz) Signal to Noise ratio = 30dB Link Margin : 20.2dB 10/19/
15 Results of on-ground S-band receiver data rate results Result: 46kbps > Requirement: 38kbps PASSED 10/19/
16 HORYU-IV Operation Status Report 10/19/
17 First Day: HORYU-IV operation 10/19/
18 On-Orbit Ground Station Verification Results 10/19/
19 HORYU-IV on-orbit Link Margin Analysis Results Two days after HORYU-IV launch On-orbit margin << On-ground margin Signal to Noise Ratio : 13.37dB What could be the problem? Link Margin : 3.37dB 10/19/
20 Packets HORYU-IV S-band Downlink Operation and Main mission Data Rate Analysis Results (Day 10 day 43 from Launch) Good Packets Error Packets HORYU-IV S-band Downlink Data Packet Analysis Result: 5.4kbps << Requirement: 38kbps FAILED Day from Launch Average received data rate: 5.4kbps 10/19/
21 Discovered Problems Reasons 0 HORYU-IV attitude was not stabilized (passive control) to orient transmitter antenna to ground. 0S-band receiver system and its interface could not correct Doppler shift. 10/19/
22 Doppler shift impact on data reception Required operating frequency range ( GHz GHz) Packet loss Frequency shift due to Doppler effect No Doppler effect Packet loss Center frequency 10/19/
23 Mitigation: Doppler shift correction implementation Before Modification After Modification 10/19/
24 Packets Results after Doppler Shift Correction Good Packets Error Packets Implementation HORYU-IV S-band Downlink Data Packets Analysis Result: 40kbps > Requirement: 38kbps PASSED Day from Launch Average received data rate: 40kbps 10/19/
25 HORYU-IV stabilization impact on data reception HORYU-IV is NOT is stabilized 10/19/ Kyushu Institute of Technology ASTRO-H Piggy-back Satellite HORYU-IV Critical Design Review July 20, 2015
26 HORYU-IV on-orbit Link Margin Analysis Results after Stabilization On-orbit margin on-ground margin Link Margin : 19.62dB 10/19/
27 HORYU-IV Image Data Results Main mission image data before Doppler shift correction and satellite stabilization Main mission image data after Doppler shift correction and satellite stabilization Main mission data quality improved 10/19/
28 HORYU-IV Earth Observation Images Ad-Damer /Sudan Region Halayb/Egypt and Port- Sudan Region HORY-4 Arc Event Generator and Investigation Satellite HORYU-IV Image Google Map HORYU-IV Image Google Map Typhoon image captured on 2 nd September during 15:32 JST HORYU-IV pass around Kyushu Island /typhoon-no-12-approaching-kyushu/ 10/19/
29 Training of HORYU-IV Operators 10/19/
30 Conclusion 0 S-band ground station can able to downlink HORYU-IV main mission data to contribute to scientific research 0 Lean satellites communication using Wi-Fi frequency range is possible. 0 Modification of S-band ground station configuration corrected Doppler shift and improved data reception 0 Passive attitude can severely impact signal strength and makes data reception difficult 0 Received data rate could satisfied the S-band communication requirement 10/19/
31 Lessons Learned 0Verify ground station performances through long distance test prior to satellite launch 0Perform ground station testing with real satellite article 0Do not only rely on manufacturers if they have little experience, "Trust but verify" strategy 10/19/
32 Lessons Learned 0Implement already-proven commercial off the shelf communication systems 0Do not underestimate the importance of Doppler shift. Check the compliance with the Doppler shift before the launch 10/19/
33 APPRECIATION /19/
34 THANK YOU 10/19/
35 QUESTIONS AND COMMENTS 10/19/
36 Appendix 10/19/
37 Software developed for HORYU-IV downlink operations 10/19/
38 Doppler compensation software Doppler compensation software developed to operate on the receiver PC Doppler compensation software developed by ELM company to integrate with the ICOM-R9500 receiver 10/19/
39 10/19/
40 Packets After modification analysis results Status of AVC motoe mission downlink data analysis Average expected Packets (Ep) Average value obtained 512 packets 1packet = 4096 bytes Comments Average expected packet to be received from satellite Good Packets Error Packets 600 HORYU-IV S-band Downlink Data Packets Analysis Average total packets received (Tp) Average good packets received (Gp) 490packets ( bits ) packets ( bit) Average total packets recorded from decoder analysis Average good packets recorded from decoder analysis Average error packets received (Er) Average time for Data reception (T) 48packets Average error packets recorded from decoder analysis 360 seconds Approximate time of data reception Day from Launch 10/19/
41 Status of AVC motoe mission downlink data analysis Average Information Bit error rate (BER) Average received Data rate (Dr) Average value obtained Cont Comments x BER = Ei /Tp 40.2kbps Dr = (Gp /T) / 1000 Average Packet lost (P L ) 48.73% P L = (Ep Tp)/Ep x 100 Average quality data reception (Qd) Analyzed average error bits from Error packets (Ei) 86.4% Qd=(Gp/ Ep) x bits Estimated average error bits obtained error packets decoded data 10/19/
42 Packets Before modification Status of AVC motoe mission downlink data analysis Average expected Packets (Ep) Average value obtained 512 packets 1packet = 4096 bytes Comments Average expected packet to be received from satellite Good Packets Error Packets HORYU-IV S-band Downlink Data Packet Analysis 500 Average total packets received (Tp) Average good packets received (Gp) Average error packets received (Er) Average time for Data reception (T) packets ( ) packets ( bits) packets Average total packets recorded from decoder analysis Average good packets recorded from decoder analysis Average error packets recorded from decoder analysis 360 seconds Approximate time of data reception Day from Launch 10/19/
43 Cont Status of AVC motoe mission downlink data analysis Average Information Bit error rate (BER) Average received Data rate (Dr) Average value obtained Comments x BER = Ei /Tp 5.4kbps Dr = (Gp /T) / 1000 Average Packet lost (P L ) 48.73% P L = (Ep Tp)/Ep x 100 Average quality data reception (Qd) Analyzed average error bits from Error packets (Ei) 11.66% Qd=(Gp/ Ep) x bits Estimated average error bits obtained error packets decoded data 10/19/
44 Spectrum Analyzer Results Obtained Value Results Link Margin Analysis Results Link Margin = Received Eb/No Required Eb/No Required Eb/No : 11.5dB Transmitted Bit Rate: 100kbps (50dBHz) Received Eb/No (db) = C/N (received) - Transmitted Bit Rate + Bandwidth Received Eb/No (db) = Received Eb/No (db) = 14.77dB Link Margin (db) = Link Margin = 3.27dB Noise floor level (N) Received Signal Strength (C) Occupied Bandwidth ( Bw) Signal to Noise Ratio (C/N) -105Bm dBm 140kHz (51.4dBHz) 13.37dB Link Margin of 3.27dB obtained could not satisfy the design requirements. 3.27dB margin means the ground station can able to tolerate additional attenuation and still can decode the downlink data. 10/19/
45 10/19/
46 10/19/
47 Results Spectrum Analyzer Results Noise floor level (N) Received Signal Strength (C) Occupied Bandwidth ( Bw) Signal to Noise Ratio (C/N) Obtained Value -120dBm dBm 140kHz (51.4dBHz) 19.72dB C = dBm - coupler loss C = dBm +10dB C = -90.2dBm C/N = 29.72dB Link Margin Analysis Results Link Margin = Received Eb/No Required Eb/No Required Eb/No : 11.5dB Transmitted Bit Rate: 100kbps (50dBHz) Received Eb/No (db) = C/N (received) - Transmitted Bit Rate + Bandwidth Received Eb/No (db) = Received Eb/No (db) = 31.12dB Link Margin (db) = Link Margin = 19.62dB 8/24/
48 Required E b /No (Theory) 10/19/
49 Level convertor unit 10/19/
50 Upconvertor Unit 10/19/
51 Feed horn Configuration 10/19/
52 Schematic of S-band GS Configuration 10/19/
53 APPRECIATION Congratulations Prof. Mengu Cho 10/19/
54 Dish Antenna Gain Measurement 10/19/
55 APPRECIATION Congratulations Prof. Mengu Cho! 10/19/
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