Observation record.Satnogs-VHF.2021-06-09T04-11-00

Ground-station Satnogs-VHF
Owner N5CNB

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite JY1SAT_(JO-97)
date 2021-06-09
time 04:11:00
duration 480
freq 1.4584e+08
culm 76.1015

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.Satnogs-VHF.2021-06-09T04-11-00.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.Satnogs-VHF.2021-06-09T04-11-00
  satellite JY1SAT_(JO-97)
  date 2021-06-09
  time 04:11:00
  samp 250000
  duration 480
  freq 1.4584e+08
  culm 76.1015
• paramètres réalisés
  recfile record.Satnogs-VHF.2021-06-09T04-11-00.dat
  start 2021-06-09T04:11:00
  end 2021-06-09T04:19:02
  freq 1.4584e+08
  gain 50
  ns 480
  samp 250000
  nsamp 120000000

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 90694100000 [ 362776 s]
  a 25432500000
  sigma -103093000000
  y0 -17270600000

calpower-stats

• Autres statistiques (de la valeur I²+Q²)
  moyenne 75.2847
  max 165.659
  moyenne.debut.fin 105.883
  hauteur.signal 59.7761 [ 17.7653 dB ] (max - moyenne.debut.fin)
  longueur.totale 480
  integrale.signal -14687 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 1.17353e+11
sumDy2 3.87779e+10
dfmin -1084.72 sumDy2 1.30254e+08
dtmin 0.0250229 sumDy2 1.30222e+08

* 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 0.970013 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 12.1847
noise_level_db 12.2587
min 3.46421
max 47.8548
freq_center 5717.44
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig 26676.4
signal_range_dB 35.5961
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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