1“Heli-Sat” System

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Antenna for mobile communication

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Antenna for mobile communication

NCMC：Network Control and Monitoring Center (航空地球局)

Aeronautical mobile

Maritime Land mobile

Ka-band Ku-band(Low Profile)

Ku-band (APAA)

Ku-band

Ku-band

Ku-band(On The Move)

Ka-band(On The Move)

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Outline of "Heli-Sat"

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Outline of "Heli-Sat"

Conventional systemUse relay station

Heli-Sat SystemDirect communication

No relay stations

Immediate data transmission from the helicopters

Relay station

Mobile relay stations

Available area for helicopter activity:within 60-70 km from the relay station

Camera Pod

Antenna

Blade

Data transmission/receiving through the rotating blade of the helicopter

Satellite communication directly from the helicopter

Operational Station

Operational Stations

Communication Satellite Communication Satellite

Heli-Sat System was developed for NICT(The National Institute of Information and Communications Technology) in Japan.

What is "Heli-Sat" ?

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Outline of "Heli-Sat"Why "Heli-Sat" ？

• Increase stability

- Transmission becomesunstable by the influence of mountains and tall building

• Steady Transmission nearmountains and tall building

• Enhance Anti-tolerance

• According to circumstances,Transmission is impossiblewhen road is cut

• Transmission is possibleeven when road is cut

• Reduce costs

- High cost for total systembecause of multiple Relaystations

• Low cost for total systembecause it is possible tomake up one earth station

Conventional system Heli-Sat

quoted from HP of Ministry of Internal Affairs and Communications

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Prototype model

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Ground Station

Helicopter(Heli-Sat)

Forward LinkFrom: Ground StationTo: Helicopter

Return LinkFrom: HelicopterTo: Ground Station

Sat-Com Link Configurations

Voice

Video/Voice (Interactive)

System configurations

Prototype model

7.3 M Hz800 K HzAssigned Band Width

37 %Disconnected Rate(by the rotating blades)

BPSKModulation Method

Viterbi / Reed SolomonError correction

1.5 Mbps64 KbpsInformation Rate

Return LinkForward Link

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Tx: Control the transmit timing, synchronizing blade rotate timing

Tx: Control the transmit timing, synchronizing blade rotate timing

Prototype model

- to avoid the link disconnection by the rotating blades of the helicopterRx: Time Diversity MethodRx: Time Diversity Method

DATA

Disconnection by the blade

Receiving signal level

Transmit TransmitTransmit

Receiving signal level

Disconnection by the blade

Transmit timing

Transmition Technique under rotating blades

10afflicted area

Video Capturing

helicopter

Communication Satellite

Operational Station

Video data communication

Map

Video

Video Mapping

Flight Position

Prototype modelVideo capturing/mapping system

Real-time situation can be confirmed !

Real-time flight positon

Video mapping on the map

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Demonstration for Fire and Disaster Management Agency (FDMA)

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HPA

LNC

UPCONV

DOWNCONV

ModemVideo Monitor

Loudspeaker

MIC

Video mappingsystem

Heli-SatSat-Com Equipments

Existing Facilities Existing Facilities

Fire, Disaster and Risk Management Center (3F)

Equipments Shelter (25F)

Indoor Units

Antenna Camera/Gimbals

GPS Gyro

Demonstration for FDMA

System Overview

CodecAntenna at Rooftop(Existing Facility)

Heli-SatVideo Equipments

Superbird B2

Ku Band

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Confirmation of the Video Quality & Voice Communication

Video quality at this demonstration(1.5 Mbps, MPEG4) is enough for the actual operation for the disaster prevention.

Interactive voice communication is very useful to define the video capturing points etc.

Confirmation of Heli-Sat systempracticality

The actual Heli-Sat operation for the disaster prevention is almost same operation of this demonstration. The stability of the Sat-Com link and practicality of the actual operation is confirmed.

Sat-Com link using Superbird-B2 Satellite, keeps enough link margin at the actual operation.

Interactive voice communication scene at the demonstration

Demonstration for FDMA

Results of the Demonstration

Video MappingScreen

Video ShootingScreen

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Production model

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Advanced approach for Production Model

Production model

Realization of High-definition◆ Speed-up of information rate: from 1.5Mbps to 6～10Mbps

◇ Increase of EIRP by using reflector antenna◇ Enhancement of forward error correction by using LDPC

◆ Application of High efficiency image encoding(H.264)

Realization of reducing the size, weightand power consumption◆ Application of reflector antenna

◇ Small, lightweight and low power consumption,compared with Active Phased Array Antenna

◆ Downsizing of cabin equipments (Antenna Control Unit, Modem)

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Production model

Feature of Production Model

AntennaACU

• Real-time Video transmission (From Helicopter to Ground Station)- Information rate: 384kbps to 10Mbps

• Stable transmission under the rotating blades and low C/N- Error correction: LDPC- Modulation Method: QPSK / BPSK

• Very small and lightweight Reflector Antenna- 0.4m diameter, weight: 18kg- No rewind for azimuth axis

• Fully automated operation- The satellite connection is remotely connected by Network Control Unit

provided in the operational station - Auto tracking for satellite direction and polarized angle

Tracking accuracy (satellite direction): 0.5degree o-p

Modem

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Application for Vehicle

Production model

Real-time HD Video transmission

Compact and standard roof bar mounting

Immediate transmission by automated acquisition