Reliable, high performance systems for receiving and processing LRIT, HRIT and GVAR data from EUMETCast, HimawariCast, GOES, COMS-1 and Electro services.

The Dartcom LRIT/HRIT System can receive, archive, process and display LRIT, HRIT and GVAR data from EUMETCast and HimawariCast DVB services, and GOES, COMS-1 and Electro direct broadcast services.

LRIT and HRIT data is an important source of information for nowcasting, numerical weather prediction, climate monitoring and research. The latest imagery and products are available as frequently as every 5 minutes, allowing major improvements in the forecasting of severe weather.

Antenna and receiver options are available to suit different services, geographical locations and requirements. All types of transmission are supported – Ku-Band and C-Band DVB services, and L-Band direct broadcast services, including the new GOES-16 HRIT and EUMETCast GOES-16 ABI level 1b services.

Ingested data can be viewed and processed using the Dartcom iDAP/MacroPro software. Outputs are also available for image processing software such as PCI Geomatica, ERDAS IMAGINE and ENVI/IDL, as well as standard interchange formats such as GeoTIFF.

The system comprises the following main components:

Antenna – various sizes available, or customers can source their own locally, or upgrade a disused WEFAX antenna if suitable.
Receiver – various options available to suit different services.
Ingest and visualisation PC – running Dartcom XRIT Ingester and Dartcom iDAP/MacroPro software. Customers can either supply their own PC, or for a turnkey solution Dartcom can supply a PC fully set-up and tested.

Brochure

Key Features

Fully automatic reception, decryption, decompression, archiving, output and processing of LRIT and HRIT data.

All current DVB and direct broadcast services services supported, including EUMETCast LRIT, HRIT, SAF and GOES ABI level 1b, HimawariCast LRIT and HRIT, GOES LRIT and HRIT, COMS-1 LRIT and HRIT, and Electro LRIT.

Simple hardware installation with little or no civil engineering works required in most cases.

Advanced multi-threaded software architecture allowing ingest from multiple services simultaneously.

Proven, robust, reliable hardware and software, with installations all over the world in all climates, temperatures and environments.

Comprehensive hardware and software diagnostics at all levels, with on-screen and email alarms, and full logging if required.

Can be integrated with the Dartcom HRPT/AHRPT System to provide a full polar-orbiter and geostationary reception station.

Dartcom XRIT Ingester – provides automatic ingest, archiving and output of LRIT and HRIT data.

Dartcom iDAP – provides a wide range of image manipulation and processing facilities such as animation, enhancement, product creation, reprojection, masking, printing and exporting to third-party formats.
Dartcom MacroPro – automates the image processing facilities provided by iDAP.

Descriptions

Ku-band Antenna

Required for Ku-Band EUMETCast LRIT, HRIT, SAF and GOES ABI level 1b reception. See Service Availability for coverage.

85cm, 1.2m or 1.8m offset dish and LNB
High-quality powder-coated aluminium (85cm, 1.2m) or glass-fibre reinforced compression moulded polyester (1.8m) reflector.
2.4–3.7m antennas also available for fringe area reception.
Supplied with azimuth/elevation mounting bracket (85cm, 1.2m), 50m of CT100 75Ω co-axial cable and F-type connectors.
1.8m antenna supplied with 4” tubular pedestal (optional non-penetrating roof mount also available).
State-of-the-art weatherproof LNB with a noise figure of 0.3dB.

DVB receiver and software
Ayecka SR1 (desk or 19” rack mount) or TBS 6903 (PCIe card) DVB-S2 receiver, both recommended by EUMETSAT.
The TBS 6903 receiver allows both EUMETCast transponders (basic/HVS1 and HVS2) to be received simultaneously with a single antenna. The HVS2 transponder includes GOES-16 ABI level 1b data which has replaced GOES East images previously transmitted on the EUMETCast LRIT service.
Supplied with drivers and T-Systems Business TV-IP software.

Ku-Band antenna specifications

85cm antenna 1.2m antenna 1.8m antenna
Reflector type 21° offset 21.3° offset Offset
Reflective
material
Solid aluminium, powder coated Solid aluminium, powder coated Glass-fibre reinforced polyester
Reflector
diameter
0.85m 1.2m 1.8m
F/D ratio 0.67 0.66 0.66
Gain 38.2dBi 41.3dBi 45.5dBi
Polarisation Linear Linear Linear
G/T @ 5°
elevation
17.2dB/K 19.2dB/K 26.0dB/K
Wind speeds 80km/h (43kt) operational
120km/h (65kt) survival
80km/h (43kt) operational
120km/h (65kt) survival
72km/h (39kt) operational
201km/h (109kt) survival

 

Ku-Band LNB specifications

Feed type Scalar horn
Polarisation Linear
RF input 10.7–12.75GHz
Noise figure 0.3dB typical
Total gain 50–60dB
LO frequency Low: 9.75GHz
High: 10.6GHz
RF output 950–2150MHz

Ayecka SR1 DVB-S2 receiver specifications

RF input frequency 950–2150MHz
RF input connector 75Ω F-type
Symbol rates 100ksps to 45Msps
Channel rate Up to 120Mbps

TBS 6903 PCIe DVB-S2 receiver specifications

RF input frequency 950–2150MHz
RF input connector 75Ω F-type
Symbol rates 1Msps to 67.5Msps
Channel rate Up to 190Mbps

C-Band Hardware

2.4m or 3.7m parabolic dish and LNB
Three-segment (2.4m) or eight-segment (3.7m) glass-fibre reinforced precision compression moulded polyester reflector.
Supplied with galvanised steel azimuth/elevation mount and pedestal, and 50m of CT100 75Ω co-axial cable.
Phase locked loop LNB in weatherproof powder-coated housing.

DVB receiver and software
TBS 6903 internal PCIe DVB-S2 receiver card.
Supplied with drivers and data acquisition software (Tellicast for EUMETCast, KenCast FAZZT for HimawariCast).

C-Band antenna specifications

2.4m antenna 3.7m antenna
Reflector type Prime focus parabolic Prime focus parabolic
Reflective material 3-segment glass-fibre reinforced polyester 8-segment glass-fibre reinforced polyester
Reflector diameter 2.4m 3.7m
F/D ratio 0.37 0.37
Gain 37.5dBi 40.9dBi
Polarisation Circular Circular
G/T @ 5° elevation 17.7dB/K 21.7dB/K
Wind speeds 80km/h (43kt) operational
201km/h (109kt) survival
72km/h (39kt) operational
201km/h (109kt) survival

C-Band LNB specifications

Feed type Scalar horn
Polarisation Circular
RF input 3.4–4.2GHz
Noise figure 0.35dB typical
Total gain >60dB
RF output 950–1750MHz

TBS 6903 PCIe DVB-S2 receiver specifications

RF input frequency 950–2150MHz
RF input connector 75Ω F-type
Symbol rates 1Msps to 67.5Msps
Channel rate Up to 190Mbps

 

L-Band dish antenna

Required for L-Band direct broadcast GOES LRIT/HRIT and GVAR, COMS-1 LRIT/HRIT and Electro LRIT reception. See Service Availability for coverage.

1.2m, 1.8m, 2.4m or 3.7m parabolic dish
Solid powder-coated aluminium (1.2m, 1.8m) or glass-fibre reinforced precision compression moulded polyester reflector with three segments (2.4m) or eight segments (3.7m).
Supplied with galvanised steel azimuth/elevation mount and pedestal, and up to 100m of RG213 50Ω co-axial cable.

Feed and downconverter
* Integrated feed/downconverter (1.2m, 1.8m, 2.4m) or scalar horn (3.7m) with N-type output.
*LNA/downconverter designed for harsh radio environments with pre-select filter to reduce cellular phone and radar interference.
*Low noise figure of 1.2dB (92K) typical.
*Weatherproof O-ring sealed machined case and connectors.

L-Band antenna specifications

1.2m antenna 1.8m antenna 2.4m antenna 3.7m antenna
Reflector
type
Prime focus parabolic Prime focus parabolic Prime focus parabolic Prime focus parabolic
Reflective
material
Solid aluminium, powder coated Solid aluminium, powder coated 3-segment glass-fibre reinforced polyester 8-segment glass-fibre reinforced polyester
Reflector
diameter
1.2m 1.8m 2.4m 3.7m
F/D ratio 0.38 0.42 0.37 0.37
Gain 24.0dBi 27.5dBi 30.3dBi 34.1dBi
Polarisation Linear Linear Linear Linear
G/T @ 5°
elevation
2.2dB/K 6.0dB/K 9.6dB/K 13.5dB/K
Wind
speeds
112km/h (60kt) operational
201km/h (109kt) survival
112km/h (60kt) operational
201km/h (109kt) survival
80km/h (43kt) operational
201km/h (109kt) survival
72km/h (39kt) operational
201km/h (109kt) survival

L-Band feed and downconverter specifications

Feed type PCB patch IFD (1.2/1.8/2.4m)
Scalar horn (3.7m)
Polarisation Linear (RHC for Electro)
RF input 1691MHz ±25MHz
LNA noise figure 1.2dB typical
Pre-LNA filter 3-pole, –3dB ±60MHz
Total gain >50dB
LO frequency 1553.5MHz
RF output 137.5MHz ±25MHz

L-Band Receiver

USB LRIT receiver
*High-quality, low-cost receiver for direct broadcast LRIT transmissions from GOES, COMS-1 and Electro.
*Also fully supports the new GOES-16 HRIT service.
*Housed in a sleek, compact, durable extruded aluminium case with styled ABS bezels.
*USB interface for fast, reliable data transfer to the host computer.
*Fully software controlled, with detailed status reports available.
*Built-in time-stamped fault logging.
*20-LED real-time signal level display for easy dish alignment and operational signal monitoring.
*Status LEDs for LNB power, signal lock, USB ready, control communications, data buffer status and frame synchronisation detection.
*Adjustable RF attenuator to accommodate LNB signal inputs between –15dBm and –75dBm.
*Supports QPSK and BPSK demodulation.
*Built-in hardware Viterbi decoding.
*Supplies power to the LNB via the RF input.
*Powered by an external switch mode PSU (supplied).
*DC–DC converter PSU also available for battery or portable operation (input 10.6–15V DC).
USB LRIT/HRIT/GVAR receiver rack
*High quality, high performance, professional grade receiver for direct broadcast LRIT/HRIT and GVAR transmissions from GOES, LRIT/HRIT from COMS-1, and LRIT from Electro.
*Available in LRIT, HRIT, combined LRIT/HRIT or combined LRIT/GVAR configurations.
*Rugged 4U-high 19” rack.
*Plug-in modules for ease of maintenance and future upgrades.
*USB interface for fast, reliable data transfer to the host computer.
*Fully software controlled, with detailed status reports available.
*Comprehensive LED and character matrix status displays and diagnostic points on the front panel.
*Supplied with up to two state-of-the-art multi-mode DSP receiver modules and USB interface modules.
*Each receiver module supplies power to the LNB via its RF input.
*Supports QPSK, BPSK and PSK demodulation.
*Built-in hardware Viterbi decoding.
*Rack or desk mount versions available.
*Powered by 100–240V AC mains, 50–400Hz.
*Upgradable to also provide HRPT/AHRPT reception by purchasing additional plug-in modules together with a tracking antenna system and Dartcom Polar Orbiter Ingester software.

GOES GVAR OPTION

GVAR (GOES Variable Format) is a type of high-resolution digital image data available from the GOES series of satellites. Although the new GOES East satellite no longer transmits GVAR data, GOES West still does, in addition to LRIT data.

To provide a complete GOES LRIT/GVAR solution for GOES West, the Dartcom GVAR Ingester software can be supplied, together with a USB LRIT/GVAR receiver rack (see L-Band Receivers). The same antenna and PC can be used for simultaneous LRIT and GVAR reception.

As with GOES LRIT and HRIT data, ingested GVAR data can be displayed and processed using the Dartcom iDAP software, with automatic processing and animation performed by the Dartcom MacroPro software.

Key features of GVAR data are:

*High-resolution digital data (0.8km visible, 4km infra-red at sub-satellite point).
*Infra-red, visible and water vapour bands.
*Calibrated temperature read-outs from infra-red data.
*Ideal for aviation weather information systems, storm warning systems, forecasting, agriculture, oceanographic studies, and environmental and meteorological programmes.

Features of the Dartcom GVAR Ingester software include:

*Direct read-out of the GVAR data stream for interference-free images.
*Output of ingested data as single-plane or multi-plane iDAP images, with repair of missing data, sub-sampling, enhancement, map overlays and archiving.
*Creation of iDAP animations, with the ability to create one animation from multiple GVAR image formats.
*Output of ingested data as single-plane CineSat files, with sub-sampling and archiving.
*Windows 10 and 64-bit compatible.

The receiver rack is supplied as standard with a single LRD-100 digital multi-mode receiver to provide reception of NOAA HRPT and Metop AHRPT data.

If continuous LRIT reception is also required, an additional LRD-100 receiver and USB interface module can be fitted, together with a dedicated antenna and XRIT Ingester software.

Alternatively a single LRD-200B digital multi-mode receiver can be supplied to provide HRPT, AHRPT and FengYun-3 L-Band reception, with LRIT reception between satellite passes.

If DMSP reception is required, an additional USB interface can be fitted to the receiver rack. However LRIT reception is then not possible unless a separate Dartcom USB LRIT receiver is supplied.

To support the proposed JPSS LRD service the digital multi-mode receivers will require a firmware upgrade, but apart from that the receiver rack is LRD ready.

Features
19” 4U high Eurocard rack.
Plug-in modules for easy maintenance and upgrades.
Desk or rack mount.
USB connection for data, rack control and GPS receiver.
RS-232/422/485 connection for rotator control, or optionally via USB if serial ports are not available on the ingest PC.

Modules
Multi-mode receivers and LNB power supplies module containing up to two digital multi-mode receivers (one as standard).
HRPT USB interface module.
AHRPT/LRD USB interface module.
Optional DMSP or LRIT USB interface module.
USB hub and serial communications module containing 7-port USB hub, USB serial adaptors and RS-232/422/485 rotator interface.
GPS receiver module.
Switch mode rack power supply module.