UAS Datalink Architecture Ad-Hoc: Status Report
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1 UAS Datalink Architecture Ad-Hoc: Status Report Participants: Frank Box, Tim Brown, Leo Globus, Steve Heppe, Raj Jain, Fred Templin, Warren Wilson, Kwong-Sang Yin Presented by Raj Jain, RTCA SC203 Committee on Unmanned Aircraft Systems, 18 th Plenary October 20, 2010 SC-203 October 20, 2010 Page 1 of 12
2 Datalink Architecture Ad-Hoc Participation Open Teleconference on alternate Tuesdays at 1:30PM ET. Next Meeting: October 26, 2010 For meeting details, please contact Raj Jain, SC-203 October 20, 2010 Page 2 of 12
3 Analysis of L-DACSL L-Band Digital Aeronautical Communication System Two projects funded by Eurocontrol for civil aviation L-DACS1: OFDMA+FDD L-DACS2: TDM+TDD OFDMA is better than TDM in terms of interference resistance TDD is better than FDD for asymmetric traffic GSM900 towers located near the airport could interfere with L- DACS2 systems Conclusion: L-DACS1 is better of the two. TDD would make it even better Formation of the ad-hoc group Started with discussion on Warren Wilson s proposal SC-203 October 20, 2010 Page 3 of 12
4 Base Architecture [Wilson] Uses both L ( MHz) and C ( MHz) Bands L-band compulsory, C-Band optional (for medium/large UAs) C-band for high-throughput video+weather OFDM TDD No simultaneous sending/receiving Individual or Networked control: Multiple controllers can optionally share a ground station 69 nmi radius cells, Total 20 UAs, 4 Video UAs, 4 Weather UAs per cell 20 Hz rep rate required ms SC-203 October 20, 2010 Page 4 of 12
5 Base Architecture (Cont) 40 ms cycle=28 ms down+12 ms up 28 ms 12 ms 4 ms turn-around time 24 ms down + 8 ms up usable Base: 37.5kHz QPSK 1/ kbps 22.5 kbps down kbps up Video: 225 khz QPSK 3/ kbps down Weather: 37.5kHz QPSK 1/ kbps down Total spectrum/cell = 20*37.5+4*225+4*37.5=1.8MHz Total Spectrum = 12*1.8 = 21.6MHz for a cluster of 12 cells L-Band: Same design 12*20*37.5kHz=9+1.4=10.4 MHz for a cluster of 12 cells SC-203 October 20, 2010 Page 5 of 12
6 Datalink Architecture Issues 1. Need to enhance availability over (Effect of 2-bands) 2. Common Architecture for Civil+UA (20 UAs vs. 200 aircrafts) 3. OFDMA carrier spacing for Doppler 4. Support both networked and non-networked controllers (Look into Femto cells, VDL4 for ideas) 5. 4ms Guard time: Need finer analysis (one-way or round trip delay?) 6a. Allocation of Channels 6b. Preemption: Should UAs in emergency be allowed to preempt others? 7. Chaining: Should UAs be allowed to reach ground station through other UAs? SC-203 October 20, 2010 Page 6 of 12
7 Multiple Receptions [Heppe] Parallel reception by multiple ground stations (GSs) Issues: 1. All ground stations will need to sync time slots: GPS 2. Each ground station receiver will need to support multiple channels: Receivers are low cost. FFT can help cover a wide spectrum. 3. Encrypted transmissions: Primary GS shares the key with selected neighbors SC-203 October 20, 2010 Page 7 of 12
8 Multiple Receptions (Cont) 4. Network layer aggregation and uplink availability Solution: Internet Routing Overlay Network (IRON) by Fred Templin SC-203 October 20, 2010 Page 8 of 12
9 Measured Data [Wilson] Measured data on UAT systems Probability of success increases iff reception are uncorrelated Need to find uncorrelated partner ground stations SC-203 October 20, 2010 Page 9 of 12
10 Dual-Band Availability L-Band GS antennas are omni C-Band GS antennas are directional C-Band uses the direction from L-Band L-Band used for entry+resource requests on both bands Two bands in series Availability =0.998*0.998 =0.996 Need to make C-band operation independent of L- Band C-Band entry SC-203 October 20, 2010 Page 10 of 12
![C-Band Entry [Heppe] Issue: C-band antennas](/docs-images/83/88179559/images/11-0.jpg "are directional 1.")
11 C-Band Entry [Heppe] Issue: C-band antennas are directional 1. Rotating antenna: (5 deg beam, 72 dwells/sec 3s/cycle) 2. Omni-directional Sectorized Antenna (300 elements, 10m dia) 3. E-scan smart Antenna (1500 elements, 1m dia) SC-203 October 20, 2010 Page 11 of 12
12 Summary Reception at multiple ground stations may help improve the availability of downstream transmissions Multiple hops Need to look at higher layers of networking L-Band and C-Band operation needs to be independent C-Band entry Outstanding issues: Scalability, OFDMA carrier spacing, Ad-hoc mode, preemption, chaining, SC-203 October 20, 2010 Page 12 of 12
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