The NOAA/NESDIS High Rate Information Transmission / Emergency Managers Weather Information Network (HRIT/EMWIN) broadcast can be received using a VSAT
system with the basic components of a VSAT antenna, low-noise block-down converter (LNB), satellite signal receiver, software to de-encapsulate the
broadcast stream and some type of visualization software. The necessary components and related specifications are located in the accompanying table.
A partial list of component and system manufacturers can be found in the “Satellite Receiving Equipment Manufacturers”. Note that this is a voluntary and partial list of vendors and there are manufacturers not listed and some that may have ceased to participate in the industry.
|Component||HRIT/EMWIN Broadcast Specifications||Additional Information|
|Platform||Operational East and West GOES-R Series Satellites||
|Broadcast||Operating Frequency Range||L-Band|
|Center Frequency||1694.1 MHz|
|Data Rate||400 Kbps|
|Symbol Rate||927 Ksps|
|Modulation - BPSK||
|Polarization - Linear||Vertical Offset|
|Antenna System||Antenna System||
HRIT/EMWIN can be received over much of the Western Hemisphere between extreme Western Africa and extreme Eastern Australia and Eastern Polynesia. The combination of
the low rain-fad characteristic of the L-band signal and the small aperture antenna required for reception allows for simultaneous reception of GOES-R Series and
Himawari reduced resolution imagery, the EMWIN content and GOES-DCS observations.
On HRIT/EMWIN, the products are arranged into Broadcast Groups and then virtual sub-channels. The HRIT/EMWIN Virtual Channel Identification – Product Table (table below) on this page and repeated under the Products Tab provides a mapping of the products to the Virtual Channel IDs with the product delivery periodicity and format.
|VCID #||Product Name||GOES-16
|0||Admin Text||X||X||60||Text Messages||N/A|
2, 2km for bands
7 and 13
|2||CMI Band 2||X||X||30||HRIT/LRIT||2 km|
|7||CMI Band 7||X||X||30||HRIT/LRIT||2 km|
|8||CMI Band 8||X||X||30||HRIT/LRIT||2 km|
|9||CMI Band 9||X||X||30||HRIT/LRIT||2 km|
|13||CMI Band 13||X||X||30||HRIT/LRIT||2 km|
|14||CMI Band 14||X||X||30||HRIT/LRIT||2 km|
|15||CMI Band 15||X||X||30||HRIT/LRIT||2 km|
|16||G16 CMI Band 13||X||180||HRIT/LRIT||2 km|
|17||G17 CMI Band 13||X||180||HRIT/LRIT||2 km|
|20||EMWIN - Priority||X||X||Variable||Text||N/A|
|21||EMWIN - Graphics||X||X||Variable||Graphic
(e.g. GIF, JPEG)
|22||EMWIN - Other||X||X||Variable||Text and Graphic||N/A|
(e.g. GIF, JPEG)
|None At This Time||JPEG||2-4 km|
There is also a link to the home web page of the product. More information on the HRIT/EMWIN broadcast and products can be found under their tabs on this site. The broadcast stream is based on the HRIT/LRIT and CCSDS Standards. Depending on the software used to de-encapsulate the broadcast stream, users can select which products to store or archive on their systems.
Most products are in formats that are easily viewed by most computer systems such as text, jpeg and gif. The GOES DCS observations, while in text, are coded. Each owner of a Data Collection Platforms (DCP) is the owner of the observation from those platforms. Each DCS user of HRIT/EMWIN is responsible for having an application to store these files in a database and to decode them.
The native format of the imagery from the GOES-R Series of satellites is the Network Common Data Form – Version 4, or netCDF4. This format is transposed into the HRIT/LRIT format for inclusion into the HRIT/EMWIN broadcast. View the netCDF and netCDF4 for more information. Visit the “Coordination Group for Meteorological Satellites LRIT/HRIT Global Specification”. Most commercial HRIT/EMWIN or XRIT systems contain software that will view and / or manipulate the images in HRIT format.
A solution for do-it-yourselfers and hobbyists is documented on the GOES-R website at https://www.goes-r.gov/users/hrit-links.html, it is also available on the “Aerospace prototype” page on the NOAASIS website. This solution uses a “simple software-based radio receiver to process the received radio frequency signal from an antenna and demodulator” and can be combined with a VSAT antenna.
During the NOAA Satellite Conference in Miami, Florida in the spring of 2010, a provisional installation of a HRIT/EMWIN system was installed in the parking lot outside the hotel conference center. The system consisted of a lightweight antenna, LNA, the original version of the prototype receiver and software, a laptop computer, a normal CRT and a batter for power. It successfully showed the satellitbe imagery of an approaching squall line with thunderstorm activity along with the EMWIN warning information and graphics.
The U.S. Government auction of L-band frequency spectrum (1695 to 1710 MHz) adjacent to GOES-R HRIT/EMWIN transponder frequency is likely to adversely impact the reliability of HRIT/EMWIN signal reception in the US due to cell phone interference.