I want to exit the weather satellite program.
After retiring from NOAA APT, I haven't tried any other weather satellites for a long time.
Firstly, the L-band signal was too high for the RTL blue TV stick. Secondly, there wasn't enough energy or resources to continue researching meteorological satellites.
Recently, HIT is preparing to hold a competition, and the fourth track involves receiving data from weather satellites. The final score will be determined by the quality of the cloud maps.
As long as the weather satellite can come back, Wade!
For Meteor M2-3/4, use OQPSK+CCSDS phase lock and decoding.
For ground station antenna equipment, I have used the RTL-SDR Blue TV Stick. Later, I switched to the RTL-SDR V3 with the U8V5 antenna.
It should be possible to decode everything. For the "horn antenna," it's said that you can receive signals at low angles, but I haven't tested this myself.
Decoding can be done using SatDump, or you can record the baseband signal first and then decode it with SatDump. This allows for separate use on mobile devices and computers.
My phase! My phase has been lost again! Oh no!
For OQPSK (which will be tested later), the constellation diagram is divided into four quadrants. In each quadrant, when the SNR is highest, it appears as a single point; conversely, when the SNR is low, the point becomes a large circle composed of many small points, but before the phase lock is complete, even if the SNR is high, it cannot decode the data.
On the main page, in Recorder, select RTL-SDR USB and set Gain to 49.6, AGC on. Then, in Processing, select Meteor M2-x LRPT 72k.
Start receiving:
The image below shows the constellation diagram after the phase-locked loop has completed.
Phase locking is achieved through a CCSDS r=1/2 concatenated decoder.
This is the key difference between decoding NOAA APT and Meteor's LRPT: with NOAA APT, you can decode data as soon as the lock is established. However, with Meteor's LRPT, you must wait for the lock to be fully established before you can decode the data.
Therefore, Meteor places great emphasis on the ratio of ground station noise to signal (I'm just saying something obvious).
Please don't take my SNR away from me! (Push)
The VHF antenna of the Meteor M2-3 deployed abnormally because it had been stored in the warehouse for too long. As a result, the M2-3 received signals only when they were above the horizon, or lost signal immediately after going below the horizon, which is normal.
Dare to ignore light (visible light).
The decoded files are placed in the `live_output` directory at the root, with the file paths as follows:
mian/live_output
2026-07-11 05:53 - meteor_m2_x - lrpt_137.9 MHz
Regarding decoding Meteor
MSU-MR is a folder of pre-processed, pseudo-colored data, similar to CADU data files. These can be re-imported into SatDump to obtain MSU-MR data again.
Secondary processing of images
On the SatDump main menu, in the Viewer page, you can import the product.cbor file from MSU-MR.
You can then edit it, add false colors, annotate city locations, define boundaries, and draw latitude and longitude lines.
Note: If you are confident in your own measurements, you can select "Fill missing data" under the Meteor option.
闽ICP备2021006864号-7
闽公网安备35020602002794号