Observation record.Marcs.2021-04-12T17-56-00

Ground-station Marcs
Owner N5FXH

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite NOAA_19
date 2021-04-12
time 17:56:00
duration 930
freq 1.371e+08
culm 73.2135

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.2021-04-12T17-56-00.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.2021-04-12T17-56-00
  satellite NOAA_19
  date 2021-04-12
  time 17:56:00
  samp 250000
  duration 930
  freq 1.371e+08
  culm 73.2135
• paramètres réalisés
  recfile record.Marcs.2021-04-12T17-56-00.dat
  start 2021-04-12T17:56:00
  end 2021-04-12T18:11:46
  freq 1.371e+08
  gain 48
  ns 930
  samp 250000
  nsamp 232500000

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 1087.92
  max 3595.42
  moyenne.debut.fin 1090.48
  hauteur.signal 2504.93 [ 33.988 dB ] (max - moyenne.debut.fin)
  longueur.totale 930
  integrale.signal -2384.02 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 1.36117e+12
sumDy2 1.27282e+12
dfmin 544.576 sumDy2 1.23322e+12
dtmin -0.91608 sumDy2 1.23316e+12

* Kepler element data for NOAA 19

name ‘NOAA_19’
satellite_number 33591
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 101.82226793

• Kepler elements
  epoch_julday 2459316.32226793
  Time jd 2459316.32227 < 2021-04-11 19:44:03.0949 UTC >
  inclination 99.189 deg [99 11'20"]
  right_ascension_of_ascending_node 120.86 deg [8:03:26]
  major_radius 7229.92 km
  eccentricity 0.0013241
  periast_argument 322.618 deg [322 37'07"]
  mean_anomaly 37.4063 deg [37 24'23"]

• Supplemental data
  cc 1.99735530184
  ra 7.2395e+06 [868488]
  rp 7.22035e+06 [849342]
  va 7436.2
  vp 7416.53
  axb 7239.5 x 7239.49
  mammmdt 325.916
  bstar 0.8141
  mean_motion_1st_deriv 4.2e-07
  mean_motion_2nd_deriv 0
  mean_motion 14.1246 rev/day 0.0707985 day/rev
  periapsis_distance 7220.35 km
  apoapsis_distance 7239.5 km
  periapsis_mean_height 849.342 km
  apoapsis_mean_height 868.488 km
  rev_number_at_epoch 62751
  tle_age 0.724341 day

* TLE

NOAA 19
1 33591U 09005A 21101.82226793 .00000042 00000-0 48141-4 0 9997
2 33591 99.1890 120.8599 0013241 322.6185 37.4063 14.12459783627519

Spectrum analysis

median 30.2576
noise_level_db 30.3586
min 19.1673
max 53.0196
freq_center -13877.7
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig -18204.8
signal_range_dB 22.6609
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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