Observation record.Marcs.2021-06-08T20-04-00

Ground-station Marcs
Owner N5FXH

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite MAX_VALIER_SAT
date 2021-06-08
time 20:04:00
duration 690
freq 1.4596e+08
culm 73.2128

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.2021-06-08T20-04-00.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.2021-06-08T20-04-00
  satellite MAX_VALIER_SAT
  date 2021-06-08
  time 20:04:00
  samp 250000
  duration 690
  freq 1.4596e+08
  culm 73.2128
• paramètres réalisés
  recfile record.Marcs.2021-06-08T20-04-00.dat
  start 2021-06-08T20:04:00
  end 2021-06-08T20:15:47
  freq 1.4596e+08
  gain 48
  ns 690
  samp 250000
  nsamp 172500000

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 -2942980000000 [ -11771920 s]
  a 124705000
  sigma -55650900000000
  y0 -53559400

calpower-stats

• Autres statistiques (de la valeur I²+Q²)
  moyenne 283.885
  max 1044.88
  moyenne.debut.fin 199.821
  hauteur.signal 845.055 [ 29.2689 dB ] (max - moyenne.debut.fin)
  longueur.totale 690
  integrale.signal 58004.1 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 2.94293e+11
sumDy2 3.65651e+11
dfmin -2971.43 sumDy2 2.75393e+11
dtmin 99.9993 sumDy2 2.5726e+11

* Kepler element data for MAX_VALIER_SAT

name ‘MAX_VALIER_SAT’
satellite_number 42778
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 158.91220624

• Kepler elements
  epoch_julday 2459373.41220624
  Time jd 2459373.41221 < 2021-06-07 21:53:34.0619 UTC >
  inclination 97.2554 deg [97 15'19"]
  right_ascension_of_ascending_node 207.836 deg [13:51:21]
  major_radius 6873.95 km
  eccentricity 0.0011142
  periast_argument 201.616 deg [201 36'57"]
  mean_anomaly 158.461 deg [158 27'40"]

• Supplemental data
  cc 1.99777408012
  ra 6.88161e+06 [510599]
  rp 6.86629e+06 [495281]
  va 7624.71
  vp 7607.74
  axb 6881.61 x 6881.6
  mammmdt 98.8817
  bstar 0.6805
  mean_motion_1st_deriv 1.053e-05
  mean_motion_2nd_deriv 0
  mean_motion 15.2359 rev/day 0.0656346 day/rev
  periapsis_distance 6866.29 km
  apoapsis_distance 6881.61 km
  periapsis_mean_height 495.281 km
  apoapsis_mean_height 510.599 km
  rev_number_at_epoch 21983
  tle_age 0.824773 day

* TLE

MAX VALIER SAT
1 42778U 17036P 21158.91220624 .00001053 00000-0 46805-4 0 9994
2 42778 97.2554 207.8359 0011142 201.6158 158.4610 15.23586863219833

Spectrum analysis

median 21.6394
noise_level_db 21.5545
min 10.9559
max 48.2873
freq_center -16750
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig -48163
signal_range_dB 26.7329
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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