SATCOM ON THE MOVE TESTING TECHNOLOGY AND PERFORMANCE ANALYSIS FOR SOTM SYSTEMS
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1 SATCOM ON THE MOVE TESTING TECHNOLOGY AND PERFORMANCE ANALYSIS FOR SOTM SYSTEMS Fraunhofer Institute for Integrated Circuits IIS Markus Landmann, Wolfgang Felber, Florian Raschke, Gregor Siegert, Mostafa Alazab, Giovanni Del Galdo Fraunhofer IIS
2 SATCOM ON THE MOVE TESTING Overview SOTM test Demonstration of capabilities based on some results SOTM-Testing for German armed forces Fraunhofer IIS
3 FORTE Overview»Satcom«research platform Test of Antenna pattern Positioning, Acquisition, and Tracking (PAT) performance Residual off-axis emissions (interference to adjacent satellites) Forward/Return link performance End-to-end link performance (e.g. mobile to mobile) including Fading of the LMS channel including satellite signal impairments Mechanical movement of the terminal platform Interference from satellites in adjacent positions for Ku-Band (12/14 GHz) or Ka-Band (20/30 GHz) Dual-linear or dual-circular polarization Fraunhofer IIS
4 Facility Structure Fraunhofer IIS
5 Channel emulator Fraunhofer IIS
6 Channel emulator / Test modes Realistic emulation of uplink and downlink channel: Delay between satellite and earth station Independent fading for up- and downlink Replay of measured profiles Replay from channel models From customer provided data Satellite Channel emulator Fraunhofer IIS
7 Channel emulator / Test modes Realistic emulation of uplink and downlink channel: Delay between satellite and earth station Independent fading for up- and downlink Replay of measured profiles Replay from channel models From customer provided data Emulation of satellite impairments: Non-linearities Carrier to Noise ratio C/N 0 adjustable Satellite Channel emulator Fraunhofer IIS
8 Channel emulator / Test modes Realistic emulation of uplink and downlink channel: Delay between satellite and earth station Independent fading for up- and downlink Replay of measured profiles Replay from channel models From customer provided data Emulation of satellite impairments: Non-linearities Carrier to Noise ratio C/N 0 adjustable Test modes: Transparent satellite Communication to a fixed ground/mobile terminal Satellite Channel emulator With assumed onboard processing (channel between the other communication partner and satellite can be neglected) Fraunhofer IIS
9 Anechoic chamber Fraunhofer IIS
10 Anechoic chamber Fraunhofer IIS
11 Anechoic chamber Modes of operation Transparent window towards tower Transparent window towards operational satellite (45 W to 45 E) Completely closed for other applications Fraunhofer IIS
12 Anechoic chamber Motion emulator User terminal dynamics emulation (3-axis rotation) Replay of measured or synthetic motion profiles Data base for user terminal dynamics is currently under construction Land mobile and maritime (ESA AO 6669 Mobile Tracking needs) Parameters: Payload dimensions: Size Weight with reduced rate/acc. Position: Roll Pitch Yaw 90 cm diameter 30 kg 75 kg / 140 cm up to ±45 up to ±45 continuously Limitation: static accuracy bandwidth of pos. signal for amplitudes up to ±0.1 Rate / Acceleration: 300 deg/s / 1000 deg/s deg/s / 1000 deg/s deg/s / 1000 deg/s 2 < Hz 20 Hz Fraunhofer IIS
13 Anechoic chamber Motion emulator User terminal dynamics emulation (3-axis rotation) Replay of measured or synthetic motion profiles Data base for user terminal dynamics is currently under construction Land mobile and maritime (ESA AO 6669 Mobile Tracking needs) Fraunhofer IIS
14 Motion Profile Measurement System Recording of profiles using GENESYS ADMA inertial measurement unit ADMA-G: Automotive Dynamic Motion Analyzer with differential GPS Fraunhofer IIS
15 Motion Profiles Measurement 8 with dutch rescue boat Fraunhofer IIS
16 Motion Profiles Comparison Fraunhofer IIS
17 Antenna tower Fraunhofer IIS
18 Antenna Tower Main Payload Up- and Down converter: For Ka and Ku band 80 MHz bandwidth Fraunhofer IIS
19 Antenna Tower Main Payload Up- and Down converter: For Ka and Ku band 80 MHz bandwidth Polarization: Linear polarized Circular polarized Fraunhofer IIS
20 Antenna Tower Main Payload Up- and Down converter: For Ka and Ku band 80 MHz bandwidth Polarization: Downlink Linear polarized Circular polarized Ka-Band ~20GHz, Zirkular, RHCP ~20GHz, Zirkular, LHCP Ku-Band ~11 GHz, Linear, H ~11 GHz, Linear, V Up/Down link ~30GHz, Linear, H ~13 GHz, Zirkular, LH Fraunhofer IIS
21 Antenna Tower Main Payload Up- and Down converter: For Ka and Ku band 80 MHz bandwidth Polarization: Linear polarized Circular polarized Clock: Clock is synchronized over the entire facility Fraunhofer IIS
22 Antenna Tower Main Payload Up- and Down converter: For Ka and Ku band 80 MHz bandwidth Polarization: Linear polarized Circular polarized Clock: Clock is synchronized over the entire facility Remote Control: All devices controllable from laboratory building Fraunhofer IIS
23 Antenna Tower Satellite Emulation Transparent satellite in Ku- and Ka band Interfering satellite (planned, between 1-3 separation) Satellite elevation of available Power sensors in Ka/Ku band for De-pointing measurement Fraunhofer IIS
24 Antenna Tower Interfering Satellite Transparent satellite in Ku- and Ka band Interfering satellite (planned, between 1-3 separation) Satellite elevation of available Power sensors in Ka/Ku band for De-pointing measurement Fraunhofer IIS
25 Antenna Tower Satellite elevations Transparent satellite in Ku- and Ka band Interfering satellite (planned, between 1-3 separation) Satellite elevation of available Power sensors in Ka/Ku band for De-pointing measurement Fraunhofer IIS
26 Antenna Tower De-pointing Measurement System Transparent satellite in Ku- and Ka band Interfering satellite (planned, between 1-3 separation) Satellite elevation of available Power sensors in Ka/Ku band for De-pointing measurement Fraunhofer IIS
27 De-pointing estimation method objective: verification of the antenna tracking performance of SOTMs under realistic: Motion Channel conditions Method: 1. measurement of reference data (pattern) with a sensor array of five sensors 2. correlation-based antenna de-pointing estimation on the Move Fraunhofer IIS
28 [ d e ] Amplitude [deg] Est. Deviation [deg] Con dence int erval [deg] SOTM test De-pointing Estimation Accuracy 1D Excitation of with Tracking Mode Switched off Excitation - E x c i t a t i n Estimation Á - E s t i m a t e Est. Error Á - E s t. E r r o r RMSE Con dence Confidence interval Interval bounds t [ s ] time [s] De-pointing [deg] Á [deg] Estimation accuracy of FORTE in the order of on average for a dish based system (Ka-Band, HPBW 1 ) in a 1D-movement (azimuth or elevation) Fraunhofer IIS
![elevation de-pointing µ [deg] [deg] elevation µ [deg] [deg] Rx Recieved power [dbm] SOTM test approach @FORTE De-pointing Accuracy 2D de-pointing estimation example Ka-band High Gain antenna (1](/docs-images/92/109281932/images/29-0.jpg "antenna beam width) circular movement of the antenna using 3-axis motion emulator (tracking mode switched off) estimation accuracy better than 0.")
29 elevation de-pointing µ [deg] [deg] elevation µ [deg] [deg] Rx Recieved power [dbm] SOTM test De-pointing Accuracy 2D de-pointing estimation example Ka-band High Gain antenna (1 antenna beam width) circular movement of the antenna using 3-axis motion emulator (tracking mode switched off) estimation accuracy better than 0.02 on average azimuth Á [deg] movement Excitation estimation Estimation azimuth de-pointing Á [deg] [deg] Fraunhofer IIS
30 SATCOM ON THE MOVE TESTING Overview SOTM test Demonstration of capabilities based on some results Discussion Fraunhofer IIS
31 Demonstration of capabilities based on some results: Test Setup Fraunhofer IIS
32 Demonstration of capabilities based on some results: Test parameters Antenna / Terminal Performance max. EIRP (@P1dB) measurement EIRP mask conformity Pointing accuracy Network performance (in presence of channel impairments): Rx & Tx throughput for each link (e.g. SOTM <-> HUB) [MBit/s] Latency [µs] Packet Loss Fraunhofer IIS
33 Demonstration of capabilities based on some results: Antenna/Terminal performance Max. EIRP Max. EIRP Measurement procedure: Detection of 1 db compression point of BUC/SSPA Power measurement of SOTM Power measurement with reference (horn) antenna Offset between both measurements determines EIRP of SOTM terminal Fraunhofer IIS
34 Demonstration of capabilities based on some results: Results Network performance Test results LMS channel effects (Fading only): Fraunhofer IIS
35 Demonstration of capabilities based on some results: Network performance - LMS channel effects (Fading only) Fraunhofer IIS
36 Demonstration of capabilities based on some results: Network performance - LMS channel effects (Doppler) Test results LMS channel effects (Doppler, System 1): Fraunhofer IIS
37 Demonstration of capabilities based on some results Results Network performance Test results LMS channel effects (Doppler, System 2): Fraunhofer IIS
38 Demonstration of capabilities based on some results Results Antenna/Terminal performance EIRP mask conformity: Detect maximum allowable based on standardized mask (ETSI, Eutelsat, FCC, ) assuming no pointing inaccuracy 2D reference measurements Fraunhofer IIS
39 Demonstration of capabilities based on some results Results Antenna/Terminal performance Depointing estimation for real world test track Estimation for azimuth and elevation over time Fraunhofer IIS
40 Demonstration of capabilities based on some results Results Antenna/Terminal performance Correlation between motion track and antenna depointing is hard to see (due to tracking algorithm) Fraunhofer IIS
41 Demonstration of capabilities based on some results Results Antenna/Terminal performance Performance for two different antenna systems in comparison Fraunhofer IIS
42 Demonstration of capabilities based on some results Conclusion Several benefits can be identified for SOTM tests at FORTE: Complete system test under real-world conditions No operational satellites have to be involved Fully controllable and reproducible test environment Individual effects can be tested separately or combined Various test scenarios are available Conclusion from precious SOTM terminal tests: Identical test conditions do not guarantee identical system behavior Separation of LMS channel effects and vehicle motion is beneficial to system performance evaluation Various test scenarios and vehicles can be efficiently tested Fraunhofer IIS
43 SatCom On-The-Move at FORTE Contact Dr.-Ing. Markus Landmann mailto: / phone: fax: Wireless Distribution Systems / Digital Broadcasting Research Group, Fraunhofer Institute for Integrated Circuits IIS Helmholtzplatz 2, Ilmenau, Germany Fraunhofer IIS
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