NOAA 氣象 衛星
NOAA 氣象 衛星
NOAA19
1
NOAA 19 can be found in the following categories:
Weather
NOAA
Search & rescue
NORAD ID: 33591
Int'l Code: 2009-005A
Perigee: 851.3 km
Apogee: 872.5 km
Inclination: 98.9 °
Period: 102.0 minutes
Semi major axis: 7,232.9 km
Launch date: February 6, 2009
Source: United States (US)
Comments: NOAA-19 is the fifth in a series of five Polar-orbiting Operational Environmental Satellites (POES) with advanced microwave sounding instruments that provide imaging and sounding capabilities. Circling 530 statute miles above Earth and completing a revolution every 100 minutes, the NOAA-N Prime will operate in the so-called "afternoon" polar orbit to replace NOAA-18 and its degraded instruments. The orbit crosses the equator from south to north at 2 p.m. on the trips around the planet. NOAA-N Prime is outfitted with instruments that provide imagery, atmospheric temperature and humidity profiles, and land and ocean surface temperature observations, all of which are key ingredients for weather forecasting. In addition, the information generates decades-long databases for climate monitoring and global change studies. In addition, the NOAA satellites are equipped with search and rescue packages that detect distress signals from emergency beacons. Over the past 26 years, the network has been credited with more than 24,000 rescues worldwide.
Two Line Element Set (TLE):
1 33591U 09005A 12166.52138904.0000051300000-030755-3 04057
2 33591 098.8633 106.3430 0014703 031.8992 328.3046 14.11351041172630
Howto receive and decode NOAA APT images with the Funcube Dongle and Gqrx
One of the great advantages of software defined radio receivers is that tuning receiver settings is a matter of adjusting software parameters. Gqrx is no different here and has optimal settings built in for weather satellite reception. This tutorial describes how to receive automatic picture transmissions (APT) from NOAA weather satellites using Gqrx SDR, record them to a WAV file, and finally decode the images using the free and open source Atpdec decoder. If you follow this guide you can end up with very nice results such as the one shown at the end.
I have used the Funcube Dongle with an Arrow antenna for this example but any receiver hardware supported by Gqrx can be used, provided that it can receive the required bandwidth, which is around 40 kHz.
Step 1: Reception and recording
NOAA APT transmissions are analog transmissions. The data coming from the imaging sensors is used to amplitude modulate a 2.4 kHz sub-carrier, which is then used to FM modulate the VHF carrier at 137.x MHz. The FM deviation is 17 kHz and using the Carson bandwidth rule we get a channel bandwidth of
BW = 2 × (17 + 2.4) kHz = 38.8 kHz
Hence the requirement for 40 kHz bandwidth. In fact, a few kHz more will not hurt but allow to track the signal during the whole pass without any active Doppler tuning.
1
VR2GY 發表於 16-6-2012 23:35 static/image/common/back.gif
1
接收 NOAA-19
