88:(AVHRR) imaging sensor is provided approximately 40 kbit/s to transmit its three image channels, and the high-resolution infrared radiation sounder (HIRS) is provided approximately 2900 bit/s. The packetized application system provides the flexibility to transmit and receive new types of data in the future using the same hardware.
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polar-orbiting satellites. The APT system provided only two image channels, which were at a reduced accuracy and resolution (8-bit, 4 km/pixel, two lines/second). Compared to the APT system, LRPT images are four times more accurate and contain twelve times the resolution. Further, the additional
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The AVHRR image data, in its raw form, consists of three images, each composed of six lines per second, at 2048 pixels per line, using 10-bits per pixel. This yields a raw datarate of 368,640 bit/s; approximately ten times greater than the allocated bandwidth. Therefore, the data is compressed using
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The initial investigations regarding the interference on MetOp-A HIRS have been completed, and the conclusion is that no scenario exists where LRPT on MetOp-A can be turned on without causing heavy interference on HIRS. Due to the operational importance of HIRS and the lack of an established LRPT
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On 4 July 2019, the METEOR-M N2-2 satellite was launched. It operated successfully until
December of the same year when it was struck by a micrometeorite. The satellite remains partially operational, however the damage forced the operators to terminate the LRPT downlink.
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The imager data is gathered into image "strips" of 2048 pixels wide and 8 rows tall before being compressed. Each packet contains three of these image strips, one for each image channel. To reconstruct a 2048x2048 image requires 256 consecutive AVHRR image packets.
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Metop HRPT/LRPT User
Station Elements Design Specification, document EPS.ASPI.DS.0675, which documents the design specification of an HRPT User Station and an LRPT User Station. To download this, google: EPS.ASPI.DS.0675
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On 8 July 2014, Russia launched the METEOR-M No. 2 weather satellite (also known as METEOR-M2) with LRPT on board. Instructions for receiving LRPT images from this satellite are posted on the
Internet.
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To ensure the low-complexity ground stations that previously received the APT signal would be able to access the LRPT signal, a design study was included with the LRPT specification. Labeled
165:-A satellite launched on 19 October 2006, LRPT was permanently deactivated on that vehicle after causing interference with the High Resolution Infrared Radiation Sounder (HIRS).
84:(kbit/s) rate. Each sensor using the LRPT is considered an application and provided a percentage of the transmission bandwidth in the form of a virtual channel. For example, the
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On 27 June 2023, the METEOR-M N2-3 satellite was launched and is operating nominally. However, the antenna failed to deploy completely, resulting in a reduced signal strength.
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the JPEG extended DCT compression, adapted to a fixed compression ratio with continuous operation (no header or trailer), to fit the virtual channel size.
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LRPT provides three image channels at full sensor resolution (10-bit, 1 km/pixel, six lines/second) in addition to data from other sensors, such as
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194:(APT) system, which dates back to the 1960s. At one point, NOAA indicated it would move to a system such as LRPT on future vehicles, but after the
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reception will be 4.9 dB when the satellite is 13° above the horizon, and improve to 8.6 dB at 30° or higher elevations.
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https://web.archive.org/web/20110520195359/http://www.ipo.noaa.gov/polarmax/2005/day01/1.5PolarMax2005-POESOverview-Schott.ppt
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http://satelliteconferences.noaa.gov/2013/docs/Tuesday,%20April%209,%202013/2.5a_POES%20to%20JPSS%20Transition.ppt
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data from other sensors increases the applications of the satellites and the users who receive the signal.
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Schott, Tom, NOAA Polar
Satellite Program Overview, PowerPoint presentation dated 25 October 2005. Go to
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http://www.rtl-sdr.com/rtl-sdr-tutorial-receiving-meteor-m-n2-lrpt-weather-satellite-images-rtl-sdr/
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radio signal. It is used aboard polar-orbiting, near-Earth weather satellite programs such as
20:(LRPT) is a digital transmission system, intended to deliver images and data from an orbital
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https://github.com/happysat/Meteor-M-N-2-3-Satellite-Operational-Status/blob/main/README.md
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user community, it is clear that LRPT will not be turned on again operationally on MetOp-A.
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LRPT Meteor M N1, receivers and software LrptRx.exe, LrptProcessor.exe, and DeJPEGger.exe
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in
February 2010, NOAA decided to eliminate Low Rate Data (LRD) transmissions from
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The system is an update and replacement of the existing analog system called
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Because of the fundamental nature of this interference in relation to the
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LRPT Meteor M N2, software decoder LRPToffLineDecoder_2014.08.19.0005.exe
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design, plans to operate LRPT on Metop-B and Metop-C were cancelled.
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113:(QPSK) signal on an RF carrier in the 137 MHz-band, with an
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How to receive Meteor-M N2 LRPT in VHF with an RTL-SDR dongle…
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Announcement to NOAA from EUMETSAT on 5 February 2007
59:(APT), which has been used since the 1960s aboard
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80:datastream transmitted at an approximately 62
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86:advanced very-high-resolution radiometer
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115:equivalent isotropically radiated power
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393:Receive NOAA satellites hand scanner
300:EUMETSAT User Service, July 18, 2008
227:High-resolution picture transmission
91:The datastream is processed using a
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161:Although LRPT is on the European
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192:automatic picture transmission
117:level that varies between 3.2
57:automatic picture transmission
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18:low-rate picture transmission
426:Earth observation satellites
111:quadrature phase-shift keyed
24:directly to end users via a
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125:) and 8.0 dBW (6.3 watts).
106:It is transmitted as an 80
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198:program was replaced with
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157:Current status and future
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52:positioning information.
138:omnidirectional antenna
95:error correction, then
436:Satellite broadcasting
288:NOAA special bulletins
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421:Broadcast engineering
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319:, see slides 6 and 9
234:Notes and references
46:atmospheric sounders
246:https://archive.org
82:kilobits per second
441:Weather satellites
315:2016-03-04 at the
362:Missing or empty
267:"HIRS — EUMETSAT"
241:site:eumetsat.int
22:weather satellite
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273:. Archived from
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93:Reed–Solomon
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76:LRPT uses a
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136:for fixed,
134:link budget
101:interleaved
97:convolution
415:Categories
144:Image data
78:packetized
99:encoded,
355:cite web
313:Archived
248:, enter
221:See also
173:—
108:kiloBaud
396:(Czech)
188:NOAA-19
130:Annex 1
40:Purpose
343:GitHub
229:(HRPT)
196:NPOESS
72:Design
34:NPOESS
182:MetOp
163:MetOp
123:watts
65:TIROS
30:MetOp
368:help
204:JPSS
200:JPSS
61:NOAA
48:and
32:and
16:The
121:(2
119:dBW
63:'s
50:GPS
26:VHF
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357:}}
353:{{
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