Observation record.Marcs.2021-04-20T08-28-00

Ground-station Marcs
Owner N5FXH

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite ISS_(ZARYA)
date 2021-04-20
time 08:28:00
duration 650
freq 1.44825e+08
culm 66.5621

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.2021-04-20T08-28-00.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.2021-04-20T08-28-00
  satellite ISS_(ZARYA)
  date 2021-04-20
  time 08:28:00
  samp 250000
  duration 650
  freq 1.44825e+08
  culm 66.5621
• paramètres réalisés
  recfile record.Marcs.2021-04-20T08-28-00.dat
  start 2021-04-20T08:28:00
  end 2021-04-20T08:39:08
  freq 1.44825e+08
  gain 48
  ns 650
  samp 250000
  nsamp 162500000

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 440.907
  max 890.042
  moyenne.debut.fin 422.226
  hauteur.signal 467.817 [ 26.7008 dB ] (max - moyenne.debut.fin)
  longueur.totale 650
  integrale.signal 12142.6 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 1.30746e+12
sumDy2 1.42614e+12
dfmin 685.787 sumDy2 1.40728e+12
dtmin -42.6124 sumDy2 1.35755e+12

* Kepler element data for ISS_(ZARYA)

name ‘ISS_(ZARYA)’
satellite_number 25544
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 109.84559034

• Kepler elements
  epoch_julday 2459324.34559034
  Time jd 2459324.34559 < 2021-04-19 20:17:39.0005 UTC >
  inclination 51.6449 deg [51 38'42"]
  right_ascension_of_ascending_node 271.291 deg [18:05:10]
  major_radius 6798.83 km
  eccentricity 0.000251
  periast_argument 252.759 deg [252 45'34"]
  mean_anomaly 211.6836 deg [211 41'01"]

• Supplemental data
  cc 1.99949812597
  ra 6.80054e+06 [429529]
  rp 6.79712e+06 [426116]
  va 7660.1
  vp 7656.26
  axb 6800.54 x 6800.54
  mammmdt 65.6286
  bstar 0.7125
  mean_motion_1st_deriv 2.14e-05
  mean_motion_2nd_deriv 0
  mean_motion 15.4891 rev/day 0.0645617 day/rev
  periapsis_distance 6797.12 km
  apoapsis_distance 6800.54 km
  periapsis_mean_height 426.116 km
  apoapsis_mean_height 429.529 km
  rev_number_at_epoch 27955
  tle_age 0.457859 day

* TLE

ISS (ZARYA)
1 25544U 98067A 21109.84559034 .00002140 00000-0 47125-4 0 9991
2 25544 51.6449 271.2911 0002510 252.7594 211.6836 15.48906700279551

Spectrum analysis

median 22.8101
noise_level_db 22.7335
min 11.9683
max 50.8002
freq_center -37853.3
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig -66074
signal_range_dB 28.0667
theo_range_dB 48.1648 [ 8 bits ]

Post-processing

Sound record.Marcs.2021-04-20T08-28-00.wfm.wav

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