Observation record.Marcs.2021-06-09T03-04-00

Ground-station Marcs
Owner N5FXH

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite LUSAT_(LO-19)
date 2021-06-09
time 03:04:00
duration 890
freq 4.37125e+08
culm 75.4392

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.Marcs.2021-06-09T03-04-00.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.Marcs.2021-06-09T03-04-00
  satellite LUSAT_(LO-19)
  date 2021-06-09
  time 03:04:00
  samp 250000
  duration 890
  freq 4.37125e+08
  culm 75.4392
• paramètres réalisés
  recfile record.Marcs.2021-06-09T03-04-00.dat
  start 2021-06-09T03:04:00
  end 2021-06-09T03:19:09
  freq 4.37125e+08
  gain 48
  ns 890
  samp 250000
  nsamp 222500000

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 -162836000000 [ -651344 s]
  a 11799400000
  sigma -265878000000
  y0 -9750940000

calpower-stats

• Autres statistiques (de la valeur I²+Q²)
  moyenne 102.594
  max 334.96
  moyenne.debut.fin 105.236
  hauteur.signal 229.724 [ 23.6121 dB ] (max - moyenne.debut.fin)
  longueur.totale 890
  integrale.signal -2351.11 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 5.091e+12
sumDy2 2.64411e+11
dfmin 881.356 sumDy2 1.46837e+11
dtmin -3.79262 sumDy2 1.37644e+11

* 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 158.8514389

• Kepler elements
  epoch_julday 2459373.3514389
  Time jd 2459373.35144 < 2021-06-07 20:26:04.0320 UTC >
  inclination 98.7409 deg [98 44'27"]
  right_ascension_of_ascending_node 114.23 deg [7:36:55]
  major_radius 7160.71 km
  eccentricity 0.0011567
  periast_argument 183.942 deg [183 56'33"]
  mean_anomaly 176.1671 deg [176 10'02"]

• Supplemental data
  cc 1.99768927282
  ra 7.16899e+06 [797984]
  rp 7.15243e+06 [781418]
  va 7470.8
  vp 7453.54
  axb 7168.99 x 7168.99
  mammmdt 60.183
  bstar 0.01776
  mean_motion_1st_deriv -2.3e-07
  mean_motion_2nd_deriv 0
  mean_motion 14.3299 rev/day 0.0697843 day/rev
  periapsis_distance 7152.43 km
  apoapsis_distance 7168.99 km
  periapsis_mean_height 781.418 km
  apoapsis_mean_height 797.984 km
  rev_number_at_epoch 63945
  tle_age 0.885506 day

* TLE

LUSAT (LO-19)
1 20442U 90005G 21158.85143890 -.00000023 00000-0 81776-5 0 9991
2 20442 98.7409 114.2303 0011567 183.9424 176.1671 14.32988076639450

Spectrum analysis

median 19.8084
noise_level_db 19.9874
min 10.4825
max 49.4298
freq_center -14859.1
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig 50944
signal_range_dB 29.4424
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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