Observation record.Marcs.2021-06-09T14-46-00

Ground-station Marcs
Owner N5FXH

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite ISS_(ZARYA)
date 2021-06-09
time 14:46:00
duration 640
freq 1.458e+08
culm 55.1152

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.2021-06-09T14-46-00.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.2021-06-09T14-46-00
  satellite ISS_(ZARYA)
  date 2021-06-09
  time 14:46:00
  samp 250000
  duration 640
  freq 1.458e+08
  culm 55.1152
• paramètres réalisés
  recfile record.Marcs.2021-06-09T14-46-00.dat
  start 2021-06-09T14:46:00
  end 2021-06-09T14:56:57
  freq 1.458e+08
  gain 48
  ns 640
  samp 250000
  nsamp 160000000

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

calpower-stats

• Autres statistiques (de la valeur I²+Q²)
  moyenne 17973.6
  max 23490.9
  moyenne.debut.fin 15842.8
  hauteur.signal 7648.11 [ 38.8355 dB ] (max - moyenne.debut.fin)
  longueur.totale 640
  integrale.signal 1.36368e+06 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 4.61433e+12
sumDy2 4.98784e+12
dfmin 4999.99 sumDy2 1.16213e+12
dtmin 99.9993 sumDy2 6.32372e+11

* Kepler element data for ISS_(ZARYA)

name ‘ISS_(ZARYA)’
satellite_number 25544
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 160.04793225

• Kepler elements
  epoch_julday 2459374.54793225
  Time jd 2459374.54793 < 2021-06-09 01:09:01.0346 UTC >
  inclination 51.6456 deg [51 38'44"]
  right_ascension_of_ascending_node 22.9831 deg [1:31:56]
  major_radius 6798.66 km
  eccentricity 0.0003611
  periast_argument 79.1376 deg [79 08'15"]
  mean_anomaly 71.0295 deg [71 01'46"]

• Supplemental data
  cc 1.99927806069
  ra 6.80111e+06 [430102]
  rp 6.7962e+06 [425192]
  va 7661.05
  vp 7655.51
  axb 6801.11 x 6801.11
  mammmdt 38.9376
  bstar 0.4711
  mean_motion_1st_deriv 9.1e-06
  mean_motion_2nd_deriv 0
  mean_motion 15.4897 rev/day 0.0645592 day/rev
  periapsis_distance 6796.2 km
  apoapsis_distance 6801.11 km
  periapsis_mean_height 425.192 km
  apoapsis_mean_height 430.102 km
  rev_number_at_epoch 28733
  tle_age 0.291072 day

* TLE

ISS (ZARYA)
1 25544U 98067A 21160.04793225 .00000910 00000-0 24711-4 0 9991
2 25544 51.6456 22.9831 0003611 79.1376 71.0295 15.48966681287339

Spectrum analysis

median 16.9073
noise_level_db 19.2915
min 0.716477
max 73.616
freq_center -61567.3
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig -62420.1
signal_range_dB 54.3245
theo_range_dB 48.1648 [ 8 bits ]

Post-processing

Sound record.Marcs.2021-06-09T14-46-00.wfm.wav

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