Observation record.Satnogs-UHF.2021-04-25T09-02-00

Ground-station Satnogs-UHF
Owner N5CNB

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite LUSAT_(LO-19)
date 2021-04-25
time 09:02:00
duration 620
freq 4.37125e+08
culm 78.5922

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-UHF.2021-04-25T09-02-00.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-UHF.2021-04-25T09-02-00
  satellite LUSAT_(LO-19)
  date 2021-04-25
  time 09:02:00
  samp 250000
  duration 620
  freq 4.37125e+08
  culm 78.5922
• paramètres réalisés
  recfile record.Satnogs-UHF.2021-04-25T09-02-00.dat
  start 2021-04-25T09:02:01
  end 2021-04-25T09:12:23
  freq 4.37125e+08
  gain 48
  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 13.1108
  max 23.2872
  moyenne.debut.fin 12.0301
  hauteur.signal 11.2572 [ 10.5143 dB ] (max - moyenne.debut.fin)
  longueur.totale 620
  integrale.signal 670.055 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 1.05645e+14
sumDy2 7.11117e+11
dfmin 508.18 sumDy2 5.9918e+10
dtmin -0.935089 sumDy2 5.35943e+10

* Kepler element data for LUSAT_(LO-19)

name ‘LUSAT_(LO-19)’
satellite_number 20442
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 114.44327097

• Kepler elements
  epoch_julday 2459328.94327097
  Time jd 2459328.94327 < 2021-04-24 10:38:18.0611 UTC >
  inclination 98.7365 deg [98 44'11"]
  right_ascension_of_ascending_node 69.4328 deg [4:37:44]
  major_radius 7160.72 km
  eccentricity 0.0011112
  periast_argument 324.9 deg [324 53'59"]
  mean_anomaly 35.1452 deg [35 08'43"]

• Supplemental data
  cc 1.99778006679
  ra 7.16868e+06 [797673]
  rp 7.15277e+06 [781759]
  va 7470.45
  vp 7453.87
  axb 7168.68 x 7168.68
  mammmdt 51.9375
  bstar 0.0976
  mean_motion_1st_deriv 1.2e-07
  mean_motion_2nd_deriv 0
  mean_motion 14.3298 rev/day 0.0697845 day/rev
  periapsis_distance 7152.77 km
  apoapsis_distance 7168.68 km
  periapsis_mean_height 781.759 km
  apoapsis_mean_height 797.673 km
  rev_number_at_epoch 63309
  tle_age 0.893187 day

* TLE

LUSAT (LO-19)
1 20442U 90005G 21114.44327097 .00000012 00000-0 20976-4 0 9992
2 20442 98.7365 69.4328 0011112 324.8998 35.1452 14.32983644633098

Spectrum analysis

median 9.70606
noise_level_db 9.79344
min 0.285119
max 41.8375
freq_center -3743.5
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig 28.4268
signal_range_dB 32.044
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