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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