Observation record.Satnogs-UHF.2021-04-16T06-58-00

Ground-station Satnogs-UHF
Owner N5CNB

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite FALCONSAT-3
date 2021-04-16
time 06:58:00
duration 390
freq 4.35103e+08
culm 37.4434

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.2021-04-16T06-58-00.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.2021-04-16T06-58-00
  satellite FALCONSAT-3
  date 2021-04-16
  time 06:58:00
  samp 250000
  duration 390
  freq 4.35103e+08
  culm 37.4434
• paramètres réalisés
  recfile record.Satnogs-UHF.2021-04-16T06-58-00.dat
  start 2021-04-16T06:58:00
  end 2021-04-16T07:04:32
  freq 4.35103e+08
  gain 48
  ns 390
  samp 250000
  nsamp 97500000

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 15.0167
  max 30.7283
  moyenne.debut.fin 12.8421
  hauteur.signal 17.8863 [ 12.5252 dB ] (max - moyenne.debut.fin)
  longueur.totale 390
  integrale.signal 848.116 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 1.13212e+13
sumDy2 8.93862e+12
dfmin -1386.72 sumDy2 7.90096e+12
dtmin 3.71108 sumDy2 7.86034e+12

* Kepler element data for FALCONSAT-3

name ‘FALCONSAT-3’
satellite_number 30776
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 104.52882711

• Kepler elements
  epoch_julday 2459319.02882711
  Time jd 2459319.02883 < 2021-04-14 12:41:30.0662 UTC >
  inclination 35.433 deg [35 25'59"]
  right_ascension_of_ascending_node 150.887 deg [10:03:33]
  major_radius 6824.54 km
  eccentricity 0.0001638
  periast_argument 23.4534 deg [23 27'12"]
  mean_anomaly 336.6269 deg [336 37'37"]

• Supplemental data
  cc 1.99967245365
  ra 6.82566e+06 [454649]
  rp 6.82342e+06 [452413]
  va 7645
  vp 7642.49
  axb 6825.66 x 6825.66
  mammmdt 7.54
  bstar 0.3763
  mean_motion_1st_deriv 3.807e-05
  mean_motion_2nd_deriv 0
  mean_motion 15.4016 rev/day 0.0649282 day/rev
  periapsis_distance 6823.42 km
  apoapsis_distance 6825.66 km
  periapsis_mean_height 452.413 km
  apoapsis_mean_height 454.649 km
  rev_number_at_epoch 78324
  tle_age 0.812805 day

* TLE

FALCONSAT-3
1 30776U 07006E 21104.52882711 .00003807 00000-0 93763-4 0 9998
2 30776 35.4330 150.8872 0001638 23.4534 336.6269 15.40162819783249

Spectrum analysis

median 10.4675
noise_level_db 10.565
min 2.54005
max 36.5164
freq_center -2837.36
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig 1412.25
signal_range_dB 25.9515
theo_range_dB 48.1648 [ 8 bits ]

Post-processing

• MESSAGE DEBUG PRINT PDU VERBOSE *
  ((transmitter . 9k6 FSK downlink))
  pdu_length = 27
  contents =
  0000: a0 84 98 92 a6 a8 00 a0 8c a6 66 40 40 17 03 f0
  0010: 50 42 3a 20 45 6d 70 74 79 2e 0d

• MESSAGE DEBUG PRINT PDU VERBOSE *
  ((transmitter . 9k6 FSK downlink))
  pdu_length = 27
  contents =
  0000: a0 84 98 92 a6 a8 00 a0 8c a6 66 40 40 17 03 f0
  0010: 50 42 3a 20 45 6d 70 74 79 2e 0d

• MESSAGE DEBUG PRINT PDU VERBOSE *
  ((transmitter . 9k6 FSK downlink))
  pdu_length = 27
  contents =
  0000: 84 84 a6 a8 82 a8 00 a0 8c a6 66 40 40 19 03 f0
  0010: 4f 70 65 6e 20 41 42 43 44 3a 20

• MESSAGE DEBUG PRINT PDU VERBOSE *
  ((transmitter . 9k6 FSK downlink))
  pdu_length = 29
  contents =
  0000: a6 a8 82 a8 aa a6 00 a0 8c a6 66 40 40 17 03 f0
  0010: 42 3a 20 37 33 34 37 34 34 31 39 36 0d

• MESSAGE DEBUG PRINT PDU VERBOSE *
  ((transmitter . 9k6 FSK downlink))
  pdu_length = 2
  contents =
  0000: f0 ab

number of decodings: 5

Credits

Decodage gr-satellites v3.6.0 (Daniel Estevez)

N5FXH’s page

Up