Observation record.Marcs.2021-04-12T18-24-00

Ground-station Marcs
Owner N5FXH

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite NOAA_15
date 2021-04-12
time 18:24:00
duration 900
freq 1.3762e+08
culm 86.836

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.2021-04-12T18-24-00.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.2021-04-12T18-24-00
  satellite NOAA_15
  date 2021-04-12
  time 18:24:00
  samp 250000
  duration 900
  freq 1.3762e+08
  culm 86.836
• paramètres réalisés
  recfile record.Marcs.2021-04-12T18-24-00.dat
  start 2021-04-12T18:24:00
  end 2021-04-12T18:39:17
  freq 1.3762e+08
  gain 48
  ns 900
  samp 250000
  nsamp 225000000

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 1273.03
  max 6933.34
  moyenne.debut.fin 1287.52
  hauteur.signal 5645.82 [ 37.5173 dB ] (max - moyenne.debut.fin)
  longueur.totale 900
  integrale.signal -13038.1 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 1.07519e+13
sumDy2 1.12318e+13
dfmin -354.976 sumDy2 1.1194e+13
dtmin -14.2102 sumDy2 1.11698e+13

* Kepler element data for NOAA 15

name ‘NOAA_15’
satellite_number 25338
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 101.85048243

• Kepler elements
  epoch_julday 2459316.35048243
  Time jd 2459316.35048 < 2021-04-11 20:24:41.0681 UTC >
  inclination 98.6891 deg [98 41'21"]
  right_ascension_of_ascending_node 130.949 deg [8:43:48]
  major_radius 7184.01 km
  eccentricity 0.0011524
  periast_argument 113.115 deg [113 06'53"]
  mean_anomaly 247.1249 deg [247 07'30"]

• Supplemental data
  cc 1.99769785299
  ra 7.19229e+06 [821282]
  rp 7.17573e+06 [804725]
  va 7458.64
  vp 7441.47
  axb 7192.29 x 7192.29
  mammmdt 99.593
  bstar 0.1804
  mean_motion_1st_deriv 3.2e-07
  mean_motion_2nd_deriv 0
  mean_motion 14.2602 rev/day 0.0701252 day/rev
  periapsis_distance 7175.73 km
  apoapsis_distance 7192.29 km
  periapsis_mean_height 804.725 km
  apoapsis_mean_height 821.282 km
  rev_number_at_epoch 19175
  tle_age 0.696173 day

* TLE

NOAA 15
1 25338U 98030A 21101.85048243 .00000032 00000-0 31804-4 0 9995
2 25338 98.6891 130.9492 0011524 113.1146 247.1249 14.26021533191751

Spectrum analysis

median 30.603
noise_level_db 30.6651
min 20.0182
max 57.4832
freq_center -13699.4
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig -1737.52
signal_range_dB 26.8181
theo_range_dB 48.1648 [ 8 bits ]

Post-processing

Credits

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

N5FXH’s page

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