Observation record.Satnogs-UHF.2021-04-18T07-16-00

Ground-station Satnogs-UHF
Owner N5CNB

Waterfall
DopplerComparaison
PostProcessing

Résumé de l'événement

satellite FALCONSAT-3
date 2021-04-18
time 07:16:00
duration 370
freq 4.35103e+08
culm 31.117

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.2021-04-18T07-16-00.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.2021-04-18T07-16-00
  satellite FALCONSAT-3
  date 2021-04-18
  time 07:16:00
  samp 250000
  duration 370
  freq 4.35103e+08
  culm 31.117
• paramètres réalisés
  recfile record.Satnogs-UHF.2021-04-18T07-16-00.dat
  start 2021-04-18T07:16:00
  end 2021-04-18T07:22:12
  freq 4.35103e+08
  gain 48
  ns 370
  samp 250000
  nsamp 92500000

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 39.668
  max 101.535
  moyenne.debut.fin 33.1511
  hauteur.signal 68.3835 [ 18.3495 dB ] (max - moyenne.debut.fin)
  longueur.totale 370
  integrale.signal 2411.24 (somme - moyenne.debut.fin*longueur.totale)

Calculated and measured Doppler comparison

Abscissa: frequency in Hz
Ordinates: time in seconds

sumY2 1.89664e+13
sumDy2 1.02812e+13
dfmin 852.672 sumDy2 9.80166e+12
dtmin -0.423312 sumDy2 9.80125e+12

* Kepler element data for FALCONSAT-3

name ‘FALCONSAT-3’
satellite_number 30776
central_object EARTH
ephemeris_type UnknownEphemerisType
epoch_year 21
epoch_day 106.5382807

• Kepler elements
  epoch_julday 2459321.0382807
  Time jd 2459321.03828 < 2021-04-16 12:55:07.0452 UTC >
  inclination 35.4329 deg [35 25'58"]
  right_ascension_of_ascending_node 137.984 deg [9:11:56]
  major_radius 6824.49 km
  eccentricity 0.0001354
  periast_argument 48.923 deg [48 55'23"]
  mean_anomaly 311.1615 deg [311 09'41"]

• Supplemental data
  cc 1.99972923666
  ra 6.82541e+06 [454407]
  rp 6.82357e+06 [452558]
  va 7644.81
  vp 7642.74
  axb 6825.41 x 6825.41
  mammmdt 354.192
  bstar 0.7478
  mean_motion_1st_deriv 3.963e-05
  mean_motion_2nd_deriv 0
  mean_motion 15.4018 rev/day 0.0649275 day/rev
  periapsis_distance 6823.57 km
  apoapsis_distance 6825.41 km
  periapsis_mean_height 452.558 km
  apoapsis_mean_height 454.407 km
  rev_number_at_epoch 78355
  tle_age 1.17278 day

* TLE

FALCONSAT-3
1 30776U 07006E 21106.53828070 .00003963 00000-0 97478-4 0 9999
2 30776 35.4329 137.9840 0001354 48.9230 311.1615 15.40179229783558

Spectrum analysis

median 14.344
noise_level_db 14.4238
min 5.84727
max 41.4103
freq_center -3724.61
trig_level_db 10
nbin_rescaling 29.9957
freq_center_trig -5807.09
signal_range_dB 26.9865
theo_range_dB 48.1648 [ 8 bits ]

Post-processing

• MESSAGE DEBUG PRINT PDU VERBOSE *
  ((transmitter . 9k6 FSK downlink))
  pdu_length = 51
  contents =
  0000: a8 98 9a a6 40 40 02 a0 8c a6 66 40 40 03 03 f0
  0010: 43 30 3a 42 44 20 43 31 3a 30 30 20 43 32 3a 46
  0020: 31 20 43 33 3a 35 30 20 43 34 3a 46 31 20 43 35
  0030: 3a 30 30

• 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 37 33 38 39 31 31 32 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 = 62
  contents =
  0000: 98 a6 a8 82 a8 40 00 a0 8c a6 66 40 40 03 03 f0
  0010: 49 20 50 3a 30 78 31 33 41 38 20 6f 3a 30 20 6c
  0020: 3a 33 31 33 36 37 20 66 3a 33 31 34 34 39 2c 20
  0030: 64 3a 31 20 73 74 3a 34 20 65 3a 31 31 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 = 22
  contents =
  0000: a8 98 9a 86 40 40 02 a0 8c a6 66 40 40 03 03 f0
  0010: 43 4c 3a 31 32 31

• MESSAGE DEBUG PRINT PDU VERBOSE *
  ((transmitter . 9k6 FSK downlink))
  pdu_length = 81
  contents =
  0000: a8 92 9a 8a 40 40 02 a0 8c a6 66 40 40 03 03 f0
  0010: 50 48 54 3a 20 75 70 74 69 6d 65 20 69 73 20 31
  0020: 31 34 39 2f 31 30 3a 31 37 3a 31 30 2e 20 20 54
  0030: 69 6d 65 20 69 73 20 53 75 6e 20 41 70 72 20 31
  0040: 38 20 30 38 3a 34 35 3a 30 39 20 32 30 32 31 0d
  0050: 20

• MESSAGE DEBUG PRINT PDU VERBOSE *
  ((transmitter . 9k6 FSK downlink))
  pdu_length = 62
  contents =
  0000: 98 a6 a8 82 a8 40 00 a0 8c a6 66 40 40 03 03 f0
  0010: 49 20 50 3a 30 78 31 33 41 38 20 6f 3a 30 20 6c
  0020: 3a 33 31 33 36 37 20 66 3a 33 31 34 34 39 2c 20
  0030: 64 3a 31 20 73 74 3a 34 20 65 3a 31 31 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: 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 = 81
  contents =
  0000: a8 92 9a 8a 40 40 02 a0 8c a6 66 40 40 03 03 f0
  0010: 50 48 54 3a 20 75 70 74 69 6d 65 20 69 73 20 31
  0020: 31 34 39 2f 31 30 3a 31 37 3a 32 36 2e 20 20 54
  0030: 69 6d 65 20 69 73 20 53 75 6e 20 41 70 72 20 31
  0040: 38 20 30 38 3a 34 35 3a 32 35 20 32 30 32 31 0d
  0050: 20

• 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 = 62
  contents =
  0000: 98 a6 a8 82 a8 40 00 a0 8c a6 66 40 40 03 03 f0
  0010: 49 20 50 3a 30 78 31 33 41 38 20 6f 3a 30 20 6c
  0020: 3a 33 31 33 36 37 20 66 3a 33 31 34 34 39 2c 20
  0030: 64 3a 31 20 73 74 3a 34 20 65 3a 31 31 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 37 33 38 39 31 31 32 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

number of decodings: 18

Credits

Decodage gr-satellites v3.6.0 (Daniel Estevez)

N5FXH’s page

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