Observation record.Satnogs-VHF.2021-04-20T01-15-00

Ground-station Satnogs-VHF
Owner N5CNB

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite METEOR-M_2
date 2021-04-20
time 01:15:00
duration 620
freq 1.371e+08
culm 58.7672

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.2021-04-20T01-15-00.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.2021-04-20T01-15-00
  satellite METEOR-M_2
  date 2021-04-20
  time 01:15:00
  samp 250000
  duration 620
  freq 1.371e+08
  culm 58.7672
• paramètres réalisés
  recfile record.Satnogs-VHF.2021-04-20T01-15-00.dat
  start 2021-04-20T01:15:00
  end 2021-04-20T01:25:22
  freq 1.371e+08
  gain 50
  ns 620
  samp 250000
  nsamp 155000000

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 102.481
  max 391.062
  moyenne.debut.fin 44.8157
  hauteur.signal 346.246 [ 25.3939 dB ] (max - moyenne.debut.fin)
  longueur.totale 620
  integrale.signal 35752.6 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 1.51706e+08
sumDy2 1.07228e+06
dfmin 81.8735 sumDy2 882.308
dtmin 0.0141859 sumDy2 867.422

* Kepler element data for METEOR-M_2

name ‘METEOR-M_2’
satellite_number 40069
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 108.71179909

• Kepler elements
  epoch_julday 2459323.21179909
  Time jd 2459323.21180 < 2021-04-18 17:04:59.0441 UTC >
  inclination 98.4674 deg [98 28'03"]
  right_ascension_of_ascending_node 140.126 deg [9:20:30]
  major_radius 7202 km
  eccentricity 0.0006869
  periast_argument 111.496 deg [111 29'46"]
  mean_anomaly 248.6947 deg [248 41'41"]

• Supplemental data
  cc 1.99862714302
  ra 7.20694e+06 [835936]
  rp 7.19705e+06 [826042]
  va 7445.86
  vp 7435.63
  axb 7206.94 x 7206.94
  mammmdt 86.5954
  bstar 0.00897
  mean_motion_1st_deriv -3.7e-07
  mean_motion_2nd_deriv 0
  mean_motion 14.2068 rev/day 0.0703887 day/rev
  periapsis_distance 7197.05 km
  apoapsis_distance 7206.94 km
  periapsis_mean_height 826.042 km
  apoapsis_mean_height 835.936 km
  rev_number_at_epoch 35155
  tle_age 0.618363 day

* TLE

METEOR-M 2
1 40069U 14037A 21108.71179909 -.00000037 00000-0 20897-5 0 9991
2 40069 98.4674 140.1259 0006869 111.4961 248.6947 14.20683209351557

Spectrum analysis

median 13.1693
noise_level_db 12.6583
min 2.69713
max 45.9162
freq_center 8409.66
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig 9599.47
signal_range_dB 33.2579
theo_range_dB 48.1648 [ 8 bits ]

Post-processing

Credits

Carte meteo METEOR_DEMOD https://github.com/dbdexter-dev/meteor_demod
Carte meteo METEOR_DECODER https://github.com/artlav/meteor_decoder

N5FXH’s page

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