Observation record.Satnogs-UHF.2021-04-17T19-31-00

Ground-station Satnogs-UHF
Owner N5CNB

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite LUSAT_(LO-19)
date 2021-04-17
time 19:31:00
duration 470
freq 4.37125e+08
culm 22.838

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.2021-04-17T19-31-00.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.2021-04-17T19-31-00
  satellite LUSAT_(LO-19)
  date 2021-04-17
  time 19:31:00
  samp 250000
  duration 470
  freq 4.37125e+08
  culm 22.838
• paramètres réalisés
  recfile record.Satnogs-UHF.2021-04-17T19-31-00.dat
  start 2021-04-17T19:31:00
  end 2021-04-17T19:38:52
  freq 4.37125e+08
  gain 48
  ns 470
  samp 250000
  nsamp 117500000

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 10.1655
  max 16.1006
  moyenne.debut.fin 9.72853
  hauteur.signal 6.37202 [ 8.04277 dB ] (max - moyenne.debut.fin)
  longueur.totale 470
  integrale.signal 205.389 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 3.06861e+13
sumDy2 7.9398e+11
dfmin 774.126 sumDy2 1.39741e+10
dtmin -0.0242861 sumDy2 1.39732e+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 106.8324328

• Kepler elements
  epoch_julday 2459321.3324328
  Time jd 2459321.33243 < 2021-04-16 19:58:42.0193 UTC >
  inclination 98.7354 deg [98 44'07"]
  right_ascension_of_ascending_node 61.7584 deg [4:07:02]
  major_radius 7160.73 km
  eccentricity 0.0011534
  periast_argument 348.038 deg [348 02'18"]
  mean_anomaly 12.0526 deg [12 03'09"]

• Supplemental data
  cc 1.9976958576
  ra 7.16899e+06 [797979]
  rp 7.15247e+06 [781460]
  va 7470.77
  vp 7453.55
  axb 7168.99 x 7168.98
  mammmdt 51.6283
  bstar 0.3086
  mean_motion_1st_deriv 1.8e-07
  mean_motion_2nd_deriv 0
  mean_motion 14.3298 rev/day 0.0697845 day/rev
  periapsis_distance 7152.47 km
  apoapsis_distance 7168.99 km
  periapsis_mean_height 781.46 km
  apoapsis_mean_height 797.979 km
  rev_number_at_epoch 63200
  tle_age 0.878794 day

* TLE

LUSAT (LO-19)
1 20442U 90005G 21106.83243280 .00000018 00000-0 23086-4 0 9998
2 20442 98.7354 61.7584 0011534 348.0382 12.0526 14.32982501632005

Spectrum analysis

median 8.8699
noise_level_db 8.98874
min 0.866961
max 39.1221
freq_center -3202.16
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig 2282.89
signal_range_dB 30.1334
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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