Acquisizione e analisi di segnali multidimensionali per il monitoraggio del Traffico Aereo

8/6/2019 Acquisizione e analisi di segnali multidimensionali per il monitoraggio del Traffico Aereo

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Acquisizione ed analisi di segnali multidimensionali per ilmonitoraggio del Traffico Aereo

G. Galati, M. Leonardi, E. G. Piracci

1DISP/CVV Tor Vergata University, Rome Italy

Forum Aerospazio e Difesa 2011Roma 16 Giugno


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Forum Aerospazio e Difesa 2011 Roma 16 giugno 2/19

Summary

Introduction/Our goals

Approach and methods

NI instruments Lab View software developing


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Introduction

ADS-B (Automatic Dependent Surveillance)MLAT (multilateration)

Provides air traffic surveillance with identification andlocalization of aircraft

ADS-B and MLAT are based on Mode S 1090 MHz signalsemitted by airborne transponders

Typical ADS-B/MLAT stations use omni-directional antennae

Object of our study:

- interference signals for the ADS-B/MLAT stations

-1090 MHz channel capacity

- proposal of enhanced receivers to improve the channel capacity


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Introduction

FRUIT environment

ADS-B Rx

SSRmode A/C

SSRmode S

1090 MHz channel traffic:-mode A/C replies-mode S replies-squitter-other: T-CAS, TIS-B

Omni-directional antenna + high density traffic =>- interferences for ADS-B/MLAT Rx stations- garbling

=> Information data loss affects the surveillance capabilities


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Introduction

Overlapping signals at omni-directional antenna

receiver

Rx

2 or more aircraft transmitting their 1090 MHzsignals with small time difference

Proposed solutions are based on:

- Enhanced signals decoding technique patent [6]

- High capacity location and identification system patent [13]- Signals discrimination capability in new receivers

[6] E.G. Piracci, S. Gelli, G. Galati, F. Fiori, PCT/IT 2008/000568 Reply detection in a secondary surveillance radar, International patentapplication, 9 September 2008.

[13] USA Patent n. US7570195B2 High capacity location and identification system, 14 Oct. 2004: RM2004A0503.


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pproacThe need of a 1090 MHz signals receiver to test processing algorithm

Standard ADS-B/MLAT ground receiver

preambledetection

decoding

Analog-digital

front-end

Decoder

antenna

- preamble detection

- decoding

- information bit sequence


7/19Forum Aerospazio e Difesa 2011 Roma 16 giugno 7/19

Approach

Mono-channel receiver with de-garbling capability

garblingdetection

de-garbling

Analog-digitalfront-end

1 channel

Processing unit Decoder

antenna

- garbling detection

-signals un-mixing

PASA algorithm



Approach

Multi-channel receiver with de-garbling capability

garblingdetection

de-garbling

Analog-digital

front-end

4 channels

Processing unit Decoder

Array antenna 4 elements

- garbling detection

-signals un-mixing

EPA algorithm



Methods

Development of the Analog-Digital front-end

LOG receiver

5 channels

ADC

Array

antenna

Linear chain

Linear chain

Linear chain

Linear chain

PC

PLL

VCO

Attenuation

control

Energy

supply

ch1

ch2

ch3

ch4

ch5

Clock out

Analog section /Down-coverter

Digital section



Antenna and analog chain (linear & LOG)

Local oscillator

RF-IF

SAW LNA Attenuatore Variabile

LNA SAW

Attenuation control

RF signal

Mixer LPfilter

IF signal

LOGLP

filter

IF signal

SAW LNA SAW

RF signal

Patch antenna

Linear channel

LOG channel



TDR analog receiver monochannel prototype

FRONT-PANEL

INTERNAL VIEW

LNA LNA

SAW

SAW

mixerLOG

power supply

PLL

splitter

OUT 1&2IN



TDR digital section by N.I.

The digital section of the TDR (sampling, acquisition andprocessing/recording) is developed using N.I. solutions

Controller:NI PXIe 8130




N.3 acquisition card: NI PXIe 5122 64 MB

Max Voltage Range: -10..10 VMin Voltage Range Sensitivity: 12.2 VSample Rate: 1-2-5-10-50-100 MS/sBandwidth: 100 MHzResolution: 14 bitsAnalog Input Channels: 2Phase Noise: -130 dBc/HzSpurious Free Dynamic Range: 75 dBc




Acquisition, processing, recording with NI Lab View

Multi-channel recordingVI screenshot




Multi-channel recordingControl panel screenshot



Developing Lab View software

Signals acquisition

Mode S detection and recording

Two super-imposed Mode S signals

acquired by TDR reciver




Advanced Mode S signals processing Garble detection

Blind source separation PA-PASA

s2

s1




Advanced Mode S signals processing EPA (multi-signals degarbling)


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Thank you for your attention

Acquisizione e analisi di segnali multidimensionali per il monitoraggio del Traffico Aereo

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