Observation record.Satnogs-UHF.2021-04-19T20-06-00

Ground-station Satnogs-UHF
Owner N5CNB

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite LUSAT_(LO-19)
date 2021-04-19
time 20:06:00
duration 580
freq 4.37125e+08
culm 52.6428

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.2021-04-19T20-06-00.transit

Additional capture data

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

• paramètres prévus
  filename record.Satnogs-UHF.2021-04-19T20-06-00
  satellite LUSAT_(LO-19)
  date 2021-04-19
  time 20:06:00
  samp 250000
  duration 580
  freq 4.37125e+08
  culm 52.6428
• paramètres réalisés
  recfile record.Satnogs-UHF.2021-04-19T20-06-00.dat
  start 2021-04-19T20:06:01
  end 2021-04-19T20:15:43
  freq 4.37125e+08
  gain 48
  ns 580
  samp 250000
  nsamp 145000000

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

• Resultats du fit
  t0 500000 [ 2 s]
  a 1000
  sigma 1500000
  y0 2000

calpower-stats

• Autres statistiques (de la valeur I²+Q²)
  moyenne 13.6304
  max 28.8389
  moyenne.debut.fin 11.2398
  hauteur.signal 17.5991 [ 12.4549 dB ] (max - moyenne.debut.fin)
  longueur.totale 580
  integrale.signal 1386.58 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 7.80057e+13
sumDy2 1.7055e+12
dfmin 726.824 sumDy2 5.12607e+10
dtmin 0.0259337 sumDy2 5.12533e+10

* Kepler element data for LUSAT_(LO-19)

name ‘LUSAT_(LO-19)’
satellite_number 20442
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 109.13663206

• Kepler elements
  epoch_julday 2459323.63663206
  Time jd 2459323.63663 < 2021-04-19 03:16:45.0009 UTC >
  inclination 98.7356 deg [98 44'08"]
  right_ascension_of_ascending_node 64.0818 deg [4:16:20]
  major_radius 7160.73 km
  eccentricity 0.00114
  periast_argument 341.148 deg [341 08'52"]
  mean_anomaly 18.9281 deg [18 55'41"]

• Supplemental data
  cc 1.99772259624
  ra 7.16889e+06 [797882]
  rp 7.15256e+06 [781555]
  va 7470.67
  vp 7453.65
  axb 7168.89 x 7168.88
  mammmdt 51.602
  bstar 0.849
  mean_motion_1st_deriv 3.3e-07
  mean_motion_2nd_deriv 0
  mean_motion 14.3298 rev/day 0.0697845 day/rev
  periapsis_distance 7152.56 km
  apoapsis_distance 7168.89 km
  periapsis_mean_height 781.555 km
  apoapsis_mean_height 797.882 km
  rev_number_at_epoch 63239
  tle_age 0.616655 day

* TLE

LUSAT (LO-19)
1 20442U 90005G 21109.13663206 .00000033 00000-0 28490-4 0 9999
2 20442 98.7356 64.0818 0011400 341.1479 18.9281 14.32982867632396

Spectrum analysis

median 9.73801
noise_level_db 9.87444
min 1.89753
max 43.163
freq_center -3503.53
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig 792.782
signal_range_dB 33.2885
theo_range_dB 48.1648 [ 8 bits ]

Post-processing

number of decodings: 0

Credits

Decodage gr-satellites v3.6.0 (Daniel Estevez)

N5FXH’s page

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