Observation record.Satnogs-UHF.2021-04-16T05-19-00

Ground-station Satnogs-UHF
Owner N5CNB

Waterfall
DopplerComparaison
PostProcessing


Résumé de l'événement

satellite FALCONSAT-3
date 2021-04-16
time 05:19:00
duration 420
freq 4.35103e+08
culm 69.376


Waterfall

The graph at the bottom left gives the waterfall (time on the abscissa, frequency on the ordinate). The graph at the top gives the integrated signal strength in frequency as a function of time. At the bottom right, the average of the spectra over all the measurement times (frequency on the ordinate).

The time range of the measurement is given in the top right part (minimum_time, maximum_time). The frequency range determined by the number of points used by the Fourier transform is given by fmin and fmax. The units used for power (or the energy received in each time slot) could not be determined.

transitfile record.Satnogs-UHF.2021-04-16T05-19-00.transit


Additional capture data

The beginning of the transit is marked by a circle and the end of the transit by a disc.


Gaussian fit

When the intensity of the signal as a function of time follows an approximately Gaussian law, this tool must capture approximately the parameters by non-linear adjustment. The adjustment is carried out using the NLOPT2 library. The behavior is undefined if the law is arbitrary.

abscisses: giga-samples name ordinates: sum_20000(I2+Q2)/1e6

calpower-stats


Calculated and measured Doppler comparison

record.Satnogs-UHF.2021-04-16T05-19-00.fft.scattered.df.png

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 2.93465e+13
sumDy2 2.24182e+13
dfmin -957.874 sumDy2 2.09185e+13
dtmin 2.94554 sumDy2 2.07733e+13


* Kepler element data for FALCONSAT-3

name ‘FALCONSAT-3’
satellite_number 30776
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 104.52882711

* TLE

FALCONSAT-3
1 30776U 07006E 21104.52882711 .00003807 00000-0 93763-4 0 9998
2 30776 35.4330 150.8872 0001638 23.4534 336.6269 15.40162819783249


Spectrum analysis

median 10.66
noise_level_db 10.7388
min 2.15684
max 38.9278
freq_center -2561.22
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig 1882.58
signal_range_dB 28.189
theo_range_dB 48.1648 [ 8 bits ]


Post-processing






































































number of decodings: 69

Credits

Decodage gr-satellites v3.6.0 (Daniel Estevez)

N5FXH’s page


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