An Innovative Signal Distribution System That Allows EMI-Free Communications For Navy Ships

Transcription

1 Liberty University University Faculty Publications and Presentations School of Engineering and Computational Sciences An Innovative Signal Distribution System That Allows EMI-Free Communications For Navy Ships Mike Maiuzzo Liberty University Follow this and additional works at: Recommended Citation Maiuzzo, Mike, "An Innovative Signal Distribution System That Allows EMI-Free Communications For Navy Ships" (2008). Faculty Publications and Presentations. Paper 1. This Article is brought to you for free and open access by the School of Engineering and Computational Sciences at University. It has been accepted for inclusion in Faculty Publications and Presentations by an authorized administrator of University. For more information, please contact

2 An Innovative Signal Distribution System That Allows EMI-Free Communications For Navy Ships Ted Harwood, Sentel Corporation Rich Adams, SPAWAR Systems Center, Pacific Mike Maiuzzo, Liberty University BACKGROUND Navy Ship Communications Systems Have Cosite EMI Problems Due to: Adjacent-Signal EMI Receiver Nonlinear Desensitization Cross Modulation Reciprocal Mixing Transmitter Noise Out-of-Band EMI Transmitter Spurious Emissions/Harmonics Receiver Spurious Responses Intermodulation Products Structural Generated IM Products Receiver IM Products Transmitter IM Products Page 2

3 BASELINE TECHNOLOGY: COLLOCATED VHF FREQUENCY HOPPING EMI Victim Receiver Range (Kilometers) Range of Victim Receiver on Command and Control Vehicle Transmitters "On" Page 3 MISSION CRITICAL TECHNOLOGY Eliminate EMI Issues Manage Up To 16 SINCGARS, 24 HAVEQUICK Maintain Receiver Range Smaller Footprint Smaller Numbers of Antennas 1 Transmit 1 Receive JTRS Compatible Page 4

4 RF DISTRIBUTION GENESIS SENTEL IRAD In Collaboration With SPAWAR FOR VHF SINCGARS ( ) SPAWAR SBIR PH I/II/III FOR UHF LOS/HAVE QUICK (2004 Present) Page 5 COMB LIMITER COMBINER (CLIC) RX ant input bandpass filters output bandpass filters Rx 1 linear splitter Rx 2 Rx 3 Rx n The CLIC Objectives: CLIC Loss = 0 db Increase Number of Receivers Connected to a Single Antenna Mitigate Interference With Limited Impact on Receiver Sensitivity Page 6

5 COMB LIMITER AMPLIFIER COMBINER (CLAC) TX ant output bandpass filters input bandpass filters power amp Tx 1 power amp power amp linear combiner Tx 2 Tx 3 power amp Tx n Replaces High Power Amplifier (HPA) And Multicouplers The CLAC Objectives: Increase Number of Transmitters Connected to a Single Antenna Mitigate Interference With Limited Impact on Transmitter Efficiency and Power Statistically Keep One Signal In One Amplification Path At One Time Page 7 IM GROWTH WITH # OF USERS MONTE CARLO SIMULATION RESULTS APPROX # OF SINCGARS CHANNELS CONTAINING AT LEAST ONE IM PRODUCT NUMBER OF ACTIVE TRANSMITTERS IN THE SAME AMPLIFIER (OR ANY NONLINEAR DEVICE) AT THE SAME TIME Page 8

6 BROADBAND AMPLIFICATION Transmitted Signals Broadband Amplifier TX 1 TX 2 TX 3 TX n C O M B I N E R Received Signals Broadband Amplifier S P L I T T E R RX 4 RX 5 RX 6 RX m Page 9 IM EFFECTS WITHOUT CLIC/CLAC SINCGARS 37.5 MHz SINCGARS 43.5 MHz With CLIC/CLAC Power TX1 (F1) TX2 (F2) Third Order IM (2F1-F2) Third Order IM (2F2-F1) Fifth Order IM (3F1-2F2) Fifth Order IM (3F2-2F1) Receiver Threshold Frequency (MHz) (# of Channels Occupied) (12) (26) (45) (80) (45) (80) (26) (12) Total (90) Total (236) Page 10

7 CLIC/CLAC SIGNAL PATH Transmitted Signals input bandpass (sub-band) filters CLAC output bandpass (sub-band) filters TX 1 TX 2 TX 3 TX n filter T1 filter T2 filter T3 filter Tn C O M B I N E R Power amp Power amp Power amp Power amp input bandpass (sub-band) filters CLIC Received Signals output bandpass (sub-band) filters S P L I T T E R filter R4 filter R5 filter R6 filter Rn RX 4 RX 5 RX 6 RX m Page 11 CLIC/CLAC TEST RESULTS FOR HOPPING RX BER, up to 8 full-band hopping interferers Page 12

8 MATLAB EMC Analysis Model (MEMCAM) Model Utilizes Standard MATLAB C Code Models CLIC / CLAC Architecture At Component Level Evaluates Linear and Non Linear Characteristics Similar To JSC Cosite Analysis Model (COSAM) Propagation Path Receiver Selectivity and Susceptibility Receiver Adjacent Signal (RAS) Transmitter Emission Spectrum Transmitter Adjacent Signal (TAS) Intermodulation Products Transmitter and Receiver Allows Trade-Offs At Component Level To Determine Optimum System Performance Validated Using Measured Data Page 13 MEMCAM VALIDATION VHF SINCGARS Measured and Simulated BER vs. Number of Interferers (Desired Signal -89 dbm, Isolation 42 db, Relay, Full-Band ) Bit Error Rate (%) Number of Interferers Simulated Threshold Measured Page 14

9 RANGE IMPROVEMENT Range of Victim Receiver compared to the Number of Transmitters Operating on an Amphib Victim Receiver Range (Kilometers) Radios In Relay (50% Duty Cycle) No Multiplexer With Legacy* With CLIC & CLAC** *Maximum shipboard range 25 km, only one hopping radio per antenna (4 antennas for 16 radios) * *All radios hopping (2 antennas, 1 TX, 1 RX) Page 15 LEGACY AMPHIB LOS COMMS 16 UHF Antennas 8 LOS 2 HQ 4 Tactical (2 Spare) 5 VHF Antennas 4 Tactical (1 Spare) Page 16

10 Presentation Title AILES AMPHIB LOS COMMS 10 UHF Antennas ¾ 2 LOS/HQ ¾ 6 Tactical ¾ (2 Spare) 3 VHF Antennas ¾ 2 Tactical ¾ (1 Spare) New Hardware Page 17 VHF SIZE WEIGHT AND POWER (SWAP) LEGACY (16 SINCGARS AN/SRC-54C TD1456/URC) AILES (16 SINCGARS) 4 Racks >> 2 Racks CLAC HI CLAC AMPS CLAC LO s Power Sup CLIC HI CLIC AMPS CLIC LO Page 18

11 UHF SIZE WEIGHT AND POWER (SWAP) LEGACY (24 UHF LOS - OA-9277/SRC) AM-7584/USC-61 (6) OA-9277/SRC ( W Amps) (24 Radio/6 Antennas) AILES (24 HQ) (1) AILES 5 Racks >> 1 2/3 Rack (24 Radio/2 Antennas) CLAC HI CLAC AMPS CLIC HI CLAC HI CLIC AMPS s/ Preamps CLIC LO Power Sup Power Sup Page 19 SUMMARY CLIC-CLAC Offers Solution To Frequency and Wideband Cosite EMI Issues For Legacy and New Waveforms SINCGARS (30 MHz 88 MHz) & HAVEQUICK (225 MHz 400 MHz) Validated By Analysis And Component Measurements. Final Prototype VHF And UHF Hardware Demonstration Scheduled Dec 08 2 MHz 30 MHz HFRG Is Obsolete And Out Of Production CVN21/CVN-78 Requires HF Suite 450 MHz 2.0 GHz SPAWAR Presently Has Several SBIR Contracts For CLIC Applications For EW Systems Validated MATLAB Model (MEMCAM) Allows Early Identification of Cosite EMI Issues And Allows Performance / Cost Trade Space Determination Page 20