Observation record.Marcs.2021-06-09T07-37-00

Ground-station Marcs
Owner N5FXH

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite NOAA_15
date 2021-06-09
time 07:37:00
duration 910
freq 1.3762e+08
culm 76.6827

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.2021-06-09T07-37-00.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.2021-06-09T07-37-00
  satellite NOAA_15
  date 2021-06-09
  time 07:37:00
  samp 250000
  duration 910
  freq 1.3762e+08
  culm 76.6827
• paramètres réalisés
  recfile record.Marcs.2021-06-09T07-37-00.dat
  start 2021-06-09T07:37:01
  end 2021-06-09T07:52:28
  freq 1.3762e+08
  gain 48
  ns 910
  samp 250000
  nsamp 227500000

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 -52876200000000 [ -211504800 s]
  a 330135000
  sigma -1000860000000000
  y0 -156575000

calpower-stats

• Autres statistiques (de la valeur I²+Q²)
  moyenne 692.399
  max 2454.81
  moyenne.debut.fin 480.6
  hauteur.signal 1974.21 [ 32.9539 dB ] (max - moyenne.debut.fin)
  longueur.totale 910
  integrale.signal 192737 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 7.05771e+14
sumDy2 6.8134e+14
dfmin -145.895 sumDy2 6.8077e+14
dtmin 5.42039 sumDy2 6.8045e+14

* Kepler element data for NOAA 15

name ‘NOAA_15’
satellite_number 25338
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 159.10477901

• Kepler elements
  epoch_julday 2459373.60477901
  Time jd 2459373.60478 < 2021-06-08 02:30:52.0906 UTC >
  inclination 98.682 deg [98 40'55"]
  right_ascension_of_ascending_node 187.713 deg [12:30:51]
  major_radius 7183.96 km
  eccentricity 0.0009414
  periast_argument 312.521 deg [312 31'15"]
  mean_anomaly 47.5175 deg [47 31'03"]

• Supplemental data
  cc 1.9981189708
  ra 7.19073e+06 [819719]
  rp 7.1772e+06 [806193]
  va 7457.09
  vp 7443.06
  axb 7190.73 x 7190.72
  mammmdt 86.86
  bstar 0.3576
  mean_motion_1st_deriv 8.4e-07
  mean_motion_2nd_deriv 0
  mean_motion 14.2604 rev/day 0.0701245 day/rev
  periapsis_distance 7177.2 km
  apoapsis_distance 7190.73 km
  periapsis_mean_height 806.193 km
  apoapsis_mean_height 819.719 km
  rev_number_at_epoch 19991
  tle_age 0.632131 day

* TLE

NOAA 15
1 25338U 98030A 21159.10477901 .00000084 00000-0 53576-4 0 9990
2 25338 98.6820 187.7134 0009414 312.5209 47.5175 14.26035553199919

Spectrum analysis

median 22.1595
noise_level_db 21.8163
min 10.6104
max 57.2485
freq_center -22190.6
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig -2989.73
signal_range_dB 35.4322
theo_range_dB 48.1648 [ 8 bits ]

Post-processing

Credits

Carte meteo WXTOIMG RESTORED v.2.10.11 https://wxtoimgrestored.xyz/

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