NOAA POES High Resolution Picture Transmission (HRPT)
 | |
|---|---|
| Frequencies | 1698 MHz,1702.5 MHz,1707 MHz,2247.5 MHz |
| Frequency Range | 1698 MHz - 2247.5 MHz |
| Mode | RAW |
| Modulation | PSK |
| ACF | — |
| Emission Designator | — |
| Bandwidth | 3 MHz |
| Location | Worldwide |
| Short Description | A former digital link used to transmit high-resolution images and other data collected from the satellite. |
| I/Q Raw Recording | — |
| Audio Sample | — |
The NOAA POES series of satellites transmitted high-resolution pictures from the AVHRR (Advanced Very High Resolution Radiometer) and, additionally, data from AMSU (Advanced Microwave Sounding Unit), HIRS (High-resolution InfraRed Sounder), SEM (Space Environment Monitor) and, for NOAA 19 only, MHS (Microwave Humidity Sounder) instruments over an HRPT link.
The signal was in PSKPhase-Shift Keying at 665 kbit/sKilobits per second (kbps).
The main payload of HRPT was AVHRR data composed of six channels in the visible, near-infrared, and infrared spectrum; only five of those can be transmitted together at a given time.
The data were digitized to 10-bit precision and transmitted at 360 lines per minute (LPM) at 665 kilobits per second (kbpsKilobits per second (kbps)). The HRPT data stream also included non-imagery data from other instruments on board the spacecraft.
NOAA-19 was decommissioned prematurely on August 12th 2025, leaving NOAA-15 as the last remaining satellite using this mode. Its L-band signal was much weaker compared to that of NOAA-19, which meant that it was practically no longer receivable for many hobbyists. Finally, on August 19th 2025, the final satellite transmitting this mode (NOAA-15) was decommissioned. This brought an end to multiple popular NOAA modes, including APT and DSBDual Side Band Modulation. This mode is no longer in use.
Data transmitted[edit]
- 6 channels from AVHRR radiometer (5 at the same time)
- 15 channels from AMSU-A sounder
- 20 channels from HIRS sounder
- 5 channels from MHS
- Data from SEM (Space Environment Monitor)
- Data from TIP (TIROS Information Processor)
- Spacecraft RTC (Real-Time Clock)
- Spacecraft telemetry and monitoring (TLM)
Signal characteristics[edit]
- Right-hand circular polarization
- Phase-shift keying modulation
- 3 MHzMegaHertz (MHz) 10^6 Hz bandwidth
- Transmit power 7 watts (1.5 watts for NOAA 15)
Satellites transmitting HRPT[edit]
L band[edit]
| Satellite | Frequency | Notes |
|---|---|---|
| NOAA 15 | 1702.5 MHzMegaHertz (MHz) 10^6 Hz | Very weak |
| NOAA 19 | 1698 MHzMegaHertz (MHz) 10^6 Hz |
S band[edit]
Since early 2023, all satellites have begun transmitting HRPT on the S-band transmitter N°4 (STX4) at full power.
| Satellite | Frequency | Notes |
|---|---|---|
| NOAA 15 | 2247.5 MHzMegaHertz (MHz) 10^6 Hz | Will switch to GAC over Svalbard, Norway |
| NOAA 19 | 2247.5 MHzMegaHertz (MHz) 10^6 Hz | Will switch to GAC over Svalbard, Norway |
Baseband recording[edit]
Decoding Software[edit]
- SatDump
- LeanHRPT-Demod (Very outdated)
Decoding Tutorials[edit]
Additional Links[edit]
Additional Images[edit]
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