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software defined radar based on P-18 antenna system
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www.sagax.hu
VHF sVHF softwareoftware radar radar based on P-18 antenna systembased on P-18 antenna system
Dr. Bertalan EgedDr. Bertalan Eged*, Benjamin Babj*, Benjamin Babjákák****
**Sagax Communications, Ltd.Sagax Communications, Ltd. Haller u. 11-13. Budapest 1Haller u. 11-13. Budapest 1096 Hungary096 Hungary
**Budapest University of Technology and Economics, **Budapest University of Technology and Economics, 1111 Budapest Goldmann Gy. t1111 Budapest Goldmann Gy. téér 3.r 3.
www.sagax.huwww.sagax.hu
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ContentContent• The goals of the projectThe goals of the project• Technological goalsTechnological goals• Implementation technologyImplementation technology• System configurationSystem configuration• User interfacesUser interfaces
– PP indicatorPP indicator
– Control panelControl panel
• Output signal descriptionOutput signal description• Typical signal processing samplesTypical signal processing samples
– Pulse compressionPulse compression
– IntegrationIntegration
– DMTIDMTI
• Field trialField trial
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The goals of the projectThe goals of the project• Experimental search radar equipment for air targets:Experimental search radar equipment for air targets:
– low-cross sectionlow-cross section– low-heigthlow-heigth– unexpectedly occurunexpectedly occur
• Experimental test systemExperimental test systemfor measurementsfor measurements
• Using existing antennaUsing existing antennasystem and platform of P-18system and platform of P-18
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Technological goalsTechnological goals• Sub-impulse modulated transmitterSub-impulse modulated transmitter• Pulse compressed receiverPulse compressed receiver• Semiconductor based Semiconductor based • Computer controllableComputer controllable• System integration readySystem integration ready
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Radio electronic equipmentRadio electronic equipment
Analogfront-end
Digitalprocessing
Domain conversionA/D és D/A
IF DownConversion
BasebandDown
Conversion
BasebandDemodulation
andProcessing
RF IF BB
Traditional implementation
Implementation based on Software Defind Radio Technology
Conversiontechnology
RFtechnology
DSPtechnology
MMI/GUItechnology
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Implementation levelsImplementation levelsDigitalsignal
handling
DigitalBB
DigitalIF
DigitalRF
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System configurationSystem configuration
P-18antennaplatform
Power supplydistributor
RFfront-end
Signal and dataprocessing
PPI
Antenna connection
RS-232
PlotsAntenna position
RS-232
IP
Syncronizationinterface
Antennacontrol
3X400Vor
3X220V
230V
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Experimental transceiverExperimental transceiver
PowerAmplifyer
TXup
converterDAC
Sub-impulsemodulated
pulse generator
Low-noiseAmplifyer
RXdown
converterADC
Pulse compression
receiver
T/Rswitch
Referenceoscillator
Control and power supply
Antenna
Antennaposition
Hardver platform
Operatingand application
programs
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Digital signal processingDigital signal processing
DigitizedIF signal
DigitizedBB signal
Band limitedintegrated
signal
Compressedpulses
Moving targets
Stayingtargets CFAR
level
Shots Targets
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Sub-impulse modulationSub-impulse modulation
0 0.5 1 1.5
x 10-3
-20
0
20
40
60
80
Time
Impu
lse
Com
pres
sion
64us radiated pulse 1us compressed received pulse
Sub-impulsmodulated search signal
Matched-filterpulse compressor
1MHz bandwidth
DSPtechnology
DSPtechnolgy
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Compression gainCompression gain
0 0.2 0.4 0.6 0.8 1 1.2x 10
-3
-10
0
10
20
30
40
time0 0.2 0.4 0.6 0.8 1 1.2x 10
-3
14
15
16
17
18
19
20
21
time
sign
al
Receiver IF output: signal+noise
Output of the matched filter: SNR improoved
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Hardware implementationHardware implementationT/R switchLNA
Low-levelRF connections
IF and triggerconnections
PAPA Power supply
Isolation transformer Platformcomputer
Booster
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Solid-state power amplifierSolid-state power amplifier4X 800W 3200W
4X 200W
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Output power measurementOutput power measurement
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PP indicatorPP indicatorMenu
Icons
Status
Display area Control area
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Control panelControl panel
Controlarea
A-typeindicator
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Automatic trigger changingAutomatic trigger changing
500 Hz
320 Hz
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Output frequenciesOutput frequencies
153 155 157 159 161 163 165 167
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Pulse compression: BarkerPulse compression: Barker
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Pulse compression: MLSPulse compression: MLS
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Pulse compression: LFMPulse compression: LFM
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Pulse compression: P2Pulse compression: P2
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Digital signal processing: CINT=1Digital signal processing: CINT=1
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Digital signal processing: CINT=10Digital signal processing: CINT=10
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Digital signal processing: VINT=1Digital signal processing: VINT=1
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Digital signal processing: VINT=10Digital signal processing: VINT=10
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Digital signal processing: DMTIDigital signal processing: DMTI
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Digital signal processing: DMTI offDigital signal processing: DMTI off
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Digital signal processing: DMTI onDigital signal processing: DMTI on
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Results: compressed pulsesResults: compressed pulses
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Results: moving targetsResults: moving targets
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Results: decision hitsResults: decision hits
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Results: target searchResults: target search
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Results: plot generationResults: plot generation
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Field trialsField trials• NATO RTO SET-078 TG-046NATO RTO SET-078 TG-046
“Multi-Band Radar For Air Defense Systems”
• COSIMA I Trial:COSIMA I Trial:– 2004 October, Medina, Hungary2004 October, Medina, Hungary
• COSIMA II Trial:COSIMA II Trial:– 2005 September, Livorno, Italy2005 September, Livorno, Italy
*Co-located Simultaneous Multi-band-radar Analysis
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COSIMA II site in ItalyCOSIMA II site in Italy
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COSIMA II deployed radarsCOSIMA II deployed radarsDIMURA (NO)
[5.9GHz]MELISSA (DE)[238-348MHz]
SRV-P18 (HU)[150-170MHz]
SzT-68UM (HU)[2.8-3.1GHz]
MMS-300 (IT)[2-18GHz]
ME
PH
IS (
DE
)[1
0/35
/94G
Hz]
150MHz-94GHz
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COSIMA II targets and trajectoriesCOSIMA II targets and trajectoriesPiper:Cesna 172
JetKingAir 200
HelikopterB200
ShipRosetti
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COSIMA II measured plots vs GPSCOSIMA II measured plots vs GPS
GPS tracksSRV-P18
plotskm
km
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COSIMA II: SRV-P18 Toszeg vs. C1COSIMA II: SRV-P18 Toszeg vs. C1
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ConclusionsConclusions
• A complete software based radar systemA complete software based radar system– Digital signal and data processingDigital signal and data processing– VHF analog front-end with VHF analog front-end with
3KWp solid-state power amplifier3KWp solid-state power amplifier– Interfacing to the existing P-18 antenna systemInterfacing to the existing P-18 antenna system
• Error-free operation during the field trialsError-free operation during the field trials
• Capability of available technology and Capability of available technology and knowledge base in Hungary was demonstratedknowledge base in Hungary was demonstrated