Observation record.Marcs.2021-04-12T20-23-00

Ground-station Marcs
Owner N5FXH

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite JY1SAT_(JO-97)
date 2021-04-12
time 20:23:00
duration 680
freq 1.4584e+08
culm 22.8989

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.2021-04-12T20-23-00.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.2021-04-12T20-23-00
  satellite JY1SAT_(JO-97)
  date 2021-04-12
  time 20:23:00
  samp 250000
  duration 680
  freq 1.4584e+08
  culm 22.8989
• paramètres réalisés
  recfile record.Marcs.2021-04-12T20-23-00.dat
  start 2021-04-12T20:23:00
  end 2021-04-12T20:34:39
  freq 1.4584e+08
  gain 48
  ns 680
  samp 250000
  nsamp 170000000

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 1135.86
  max 21660.7
  moyenne.debut.fin 813.833
  hauteur.signal 20846.9 [ 43.1904 dB ] (max - moyenne.debut.fin)
  longueur.totale 680
  integrale.signal 218976 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 1.35053e+11
sumDy2 1.39411e+11
dfmin -1252.65 sumDy2 1.33886e+11
dtmin 19.7993 sumDy2 1.33425e+11

* 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 101.43902845

• Kepler elements
  epoch_julday 2459315.93902845
  Time jd 2459315.93903 < 2021-04-11 10:32:12.0058 UTC >
  inclination 97.6678 deg [97 40'04"]
  right_ascension_of_ascending_node 173.485 deg [11:33:56]
  major_radius 6958.84 km
  eccentricity 0.0013578
  periast_argument 275.4 deg [275 23'59"]
  mean_anomaly 84.5676 deg [84 34'03"]

• Supplemental data
  cc 1.99728808224
  ra 6.96829e+06 [597282]
  rp 6.94939e+06 [578385]
  va 7579.91
  vp 7559.35
  axb 6968.29 x 6968.28
  mammmdt 330.484
  bstar 0.04265
  mean_motion_1st_deriv -3e-07
  mean_motion_2nd_deriv 0
  mean_motion 14.9579 rev/day 0.0668542 day/rev
  periapsis_distance 6949.39 km
  apoapsis_distance 6968.29 km
  periapsis_mean_height 578.385 km
  apoapsis_mean_height 597.282 km
  rev_number_at_epoch 12847
  tle_age 1.1075 day

* TLE

JY1SAT (JO-97)
1 43803U 18099AX 21101.43902845 -.00000030 00000-0 24265-5 0 9993
2 43803 97.6678 173.4847 0013578 275.3996 84.5676 14.95792026128475

Spectrum analysis

median 28.5289
noise_level_db 28.6491
min 10.4612
max 73.2389
freq_center -14051.9
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig -100478
signal_range_dB 44.5898
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

Up