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