Observation record.Satnogs-UHF.2021-04-20T09-12-00

Ground-station Satnogs-UHF
Owner N5CNB

Waterfall
DopplerComparaison
PostProcessing


Résumé de l'événement

satellite FALCONSAT-3
date 2021-04-20
time 09:12:00
duration 400
freq 4.35103e+08
culm 44.2167


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.2021-04-20T09-12-00.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.2021-04-20T09-12-00.fft.scattered.df.png

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 5.25914e+13
sumDy2 3.25192e+13
dfmin -569.555 sumDy2 3.17239e+13
dtmin 2.93085 sumDy2 3.15924e+13


* Kepler element data for FALCONSAT-3

name ‘FALCONSAT-3’
satellite_number 30776
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 109.13107435

* TLE

FALCONSAT-3
1 30776U 07006E 21109.13107435 .00006683 00000-0 16308-3 0 9997
2 30776 35.4334 121.3345 0001223 90.9098 269.1770 15.40219715783958


Spectrum analysis

median 14.5279
noise_level_db 14.6014
min 6.2968
max 41.9894
freq_center -2364.2
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig 772.806
signal_range_dB 27.388
theo_range_dB 48.1648 [ 8 bits ]


Post-processing










































































number of decodings: 73

Credits

Decodage gr-satellites v3.6.0 (Daniel Estevez)

N5FXH’s page


Up