Chang Zheng-2D - 2021-10-14

Satellites & Observations Launches
1

There are two unknown satellites transmitting in UHF amateur radio band found by @cgbsat.

According to Gunter’s website it should be one of these:

We perform with @PE0SAT some experiments by trying different modulations and baudrates to demodulate/decode the signals. With a quick search I think that the signals come from SSS satellites.

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2

One of the satellites crossed the beam of the Dwingeloo telescope in SatNOGS Network - Observation 5318886 (beam crossing based on TLE indicated in the waterfall below). But given that there are plenty of other good observations, the problem is probably not SNR.

image
image846×1606 82.5 KB

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3

I can’t imagine this is helpful, but just in case…

If you isolate the strongest packet from

SatNOGS Network - Observation 5318886

… and resample to 192k audio, it does demod as 115,200 FSK producing a series of:

pdu_length = 4
contents = 
0000: c0 3d 7a 37

… probably a false-alarm but I wanted to contribute on the chance that it gives someone an idea.

-Scott, K4KDR
.

satnogs-unk-115200
satnogs-unk-1152001872×978 176 KB

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4

This looks like BPSK to me…

5

49322 drifted through the Dwingeloo beam again: SatNOGS Network - Observation 5351371

6

No IQ raw recording for this observation?

7

It’s at SatNOGS IQ data now (putting it there is a manual operation, I hadn’t done it yet).

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8

The unknown satellite following 49322, was identified and it is SSS-1 from this launch.

Sources:
https://hkxb.buaa.edu.cn/CN/10.7527/S1000-6893.2022.27399
https://sat.huijiwiki.com/wiki/北航亚太一号#有效载荷简介

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