Observation record.Marcs.2021-06-09T09-26-00

Ground-station Marcs
Owner N5FXH

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite JY1SAT_(JO-97)
date 2021-06-09
time 09:26:00
duration 670
freq 1.4584e+08
culm 18.9059

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.2021-06-09T09-26-00.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.2021-06-09T09-26-00
  satellite JY1SAT_(JO-97)
  date 2021-06-09
  time 09:26:00
  samp 250000
  duration 670
  freq 1.4584e+08
  culm 18.9059
• paramètres réalisés
  recfile record.Marcs.2021-06-09T09-26-00.dat
  start 2021-06-09T09:26:00
  end 2021-06-09T09:37:27
  freq 1.4584e+08
  gain 48
  ns 670
  samp 250000
  nsamp 167500000

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 12012.4
  max 21784.6
  moyenne.debut.fin 9252.8
  hauteur.signal 12531.8 [ 40.9801 dB ] (max - moyenne.debut.fin)
  longueur.totale 670
  integrale.signal 1.84891e+06 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 2.15282e+13
sumDy2 1.36905e+13
dfmin -3697.01 sumDy2 2.59854e+12
dtmin -6.0182 sumDy2 2.59601e+12

* Kepler element data for JY1SAT_(JO-97)

name ‘JY1SAT_(JO-97)’
satellite_number 43803
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 158.76742865

• Kepler elements
  epoch_julday 2459373.26742865
  Time jd 2459373.26743 < 2021-06-07 18:25:05.0835 UTC >
  inclination 97.6634 deg [97 39'48"]
  right_ascension_of_ascending_node 229.593 deg [15:18:22]
  major_radius 6958.63 km
  eccentricity 0.0016681
  periast_argument 83.9897 deg [83 59'23"]
  mean_anomaly 276.3225 deg [276 19'21"]

• Supplemental data
  cc 1.99666935585
  ra 6.97023e+06 [599227]
  rp 6.94702e+06 [576011]
  va 7582.38
  vp 7557.12
  axb 6970.23 x 6970.22
  mammmdt 297.808
  bstar 0.03851
  mean_motion_1st_deriv -1.9e-07
  mean_motion_2nd_deriv 0
  mean_motion 14.9586 rev/day 0.0668511 day/rev
  periapsis_distance 6947.02 km
  apoapsis_distance 6970.23 km
  periapsis_mean_height 576.011 km
  apoapsis_mean_height 599.227 km
  rev_number_at_epoch 13704
  tle_age 0.969412 day

* TLE

JY1SAT (JO-97)
1 43803U 18099AX 21158.76742865 -.00000019 00000-0 33851-5 0 9993
2 43803 97.6634 229.5926 0016681 83.9897 276.3225 14.95861172137042

Spectrum analysis

median 19.1794
noise_level_db 19.3779
min 2.12062
max 72.8784
freq_center -63645.4
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig -99337.1
signal_range_dB 53.5005
theo_range_dB 48.1648 [ 8 bits ]

Post-processing

number of decodings: 0

Credits

Decodage gr-satellites v3.6.0 (Daniel Estevez)

N5FXH’s page

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