Ground Segment

The team has established a fully functional Ground Station in the premises with uplink and downlink capability in both the 434-438 MHz (UHF) as well as the 144-148 MHz (VHF) bands.

COEP Ground Station Antennas

The Ground Segment includes an array of 2 crossed Yagi antennas for the 434-438 MHz band and a simple Yagi Uda and Potato Masher antenna for the 144-148 MHz range.

GS Interface

The antennas are used for tracking through Yaesu G-5500 Rotor Interface with both Azimuth and Elevation tracking capacity.

For Uplink, we have a 25W High power Amplifier, and for Downlink, we have employed a Low Noise Amplifier.

For Analog reception and transmission, we use Kenwood TS-2000 Transceiver

We have used GPredict, Orbitron and Nova for tracking satellites.

COEP Ground Station

We have also successfully received SSTV image from International Space Station.
We have received Yuri Gagarin’s photos transmitted by RS0ISS on 145.800 MHz. A ground plane antenna was used along with ICOM 2100h. Software used to decode the audio is MMSSTV.

 

SSTV reception at COEP GS

SSTV reception at COEP GS

For Digital reception and transmission, we have designed a custom hardware and software setup for packet data involving CC1120 based digital transceiver with a facility for doppler compensation of satellite communication frequency. We have received data from satellites like Bugsat-1, TigriSat, Unisat-6 using our custom setup. The data received for Bugsat-1 (Tita) has also been verified by the Bugsat-1 team.

Data packets received from TigriSat           Date: 3rd August 2015

86 a2 40 40 40 40 60 90 9c 82 a8 92 8e e1 03 f0 54 49 47 52 49 53 41 54 20 41 42 41 43 55 53 20 42 45 41 43 4f 4e
HNATIG>CQ:TIGRISAT ABACUS BEACON
86 a2 40 40 40 40 60 90 9c 82 a8 92 8e 21 03 6c ca 00 00 04 04 04 04 04 fc 03 14 00 04 00 00 00 08 04 80 02 fc c3 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80 00 00 00 7c dc 4e

 

Data packets received from Unisat-6           Date: 31st October 2015

86 A2 40 40 40 40 60 92 92 60 AA A6 40 E1 03 F0 55 53 36 A1 20 26 14 01 38 6B 00 FD B5 8B 04 5E FE 32 56 04 03 15 00 FC FF DA FF B3 F1 62 FB 11 02 AE 01 0E 19 2B 3D 3D 6F 78 3E 3D 00 26 00 51 03 57 03 9D 03 00 00 42 02 BC 01 01 00 0F 00 00 05 7C 44 47

 

Data packets received from Bugsat-1           Date: 31st October 2015

86 A2 40 40 40 40 60 98 AA 6E 82 82 00 E1 03 F0 3A 45 4D 41 49 4C 20 20 20 20 3A 74 69 74 61 40 73 61 74 65 6C 6C 6F 67 69 63 2E 63 6F 6D 20 00 04 55 70 74 3A 20 30 31 3A 32 32 3A 32 39 20 01 04 02 04 03 04 42 61 74 3A 31 32 2E 34 31 76 20 04 04 54 65 6D 70 3A 32 31 2E 38 43 20 05 04 47 79 72 3A 30 2E 35 33 64 2F 73 20 06 04 68 00

 

Decoded Data of Bugsat–1
Data Field Value
‘pcm_3v3_A’ 1.995297,
‘wheel_4_radsec’ 0.0,
‘rtc_s’ 1421778432,
‘magnetometerY_mg’ 275.5,
‘CPU_C’ 30.54,
‘sunvectorX’ 0.548583984375,
‘nice_battery_v’ 11.927,
‘antennaDeployStatus’ 111,
‘free’ 26736,
‘currentMode’ 132,
‘sunvectorZ’ 0.7979736328125,
‘experimentsRun’ 904,
‘wheel_1_radsec’ 0.0,
‘experimentsFailed’ 578,
‘pcm_3v3_V’ 3.3459320000000004,
‘magnetometerX_mg’ -203.5,
‘temperature_IMU_C’ 20.939999999999998,
‘wheel_3_radsec’ 0.0,
‘currentState’ 0,
‘battery_A’ 0.413723,
‘lastSeenSequenceNumber’ 9728,
‘fine_gyroZ_dps’ 0.016507936507936506,
‘uptime_s’ 275270,
‘gyroX_mg’ -0.08750000000000001,
‘resetCount’ [0, 0, 221],
‘fine_gyroX_dps’ 0.004920634920634921,
‘mirror_cell_temp’ 7.66,
‘sunvectorY’ 0.24932861328125,
‘lastExperimentRun’ 49,
‘gyroZ_mg’ 0.0125,
‘magnetometerZ_mg’ -413.0,
‘lastBootReason’ 136891800,
‘pcm_5v_A’ 0.7855500000000001,
‘fine_gyroY_dps’ 0.8692063492063492,
‘mode’ 0,
‘raw_battery_v’ 11.83073,
‘low_voltage_counter’ 3,
‘gyroY_mg’ 5.11428,
‘wheel_2_radsec’ 0,
‘gyroY_mg’ 1.025,
‘pcm_5v_V’ 5.11428,

We have successfully tracked and received beacon rom the following satellite

  • AISAT-1
  • AMSAT Oscar AO-7
  • BUGSAT-1
  • CUBEBUG-1
  • CUTE-I
  • DELFI C3
  • FO-29
  • FUNCUBE AO-73
  • HAMSAT VO-52
  • HORYU-2
  • INVADER ARTSAT-1
  • ISS Zarya Module
  • ITUPSAT
  • JAS-2B
  • JUGNU
  • KISEKI
  • KKS-1
  • MOZHAYETS-4
  • NOAA 18
  • NOAA 19
  • PICODRAGON
  • SEEDS II
  • SRMSat
  • STRAND-1
  • SWISS CUBE
  • TIGRISAT
  • TISAT
  • TJ3SAT
  • UNISAT-6
  • UWE-3
  • VELOX-1
  • VO-52
  • XI-IV
  • XI-V
  • XW-I

Successfully Digipeated with ISS Zarya Module via APRS using UISS software. Antennas designed for the Ground Segment:434-438 MHz band array of crossed Yagi-Uda434-438 MHz band singular crossed Yagi-Uda144-145 MHz band hand held simple Yagi-Uda144-145 MHz band omni-directional Egg beater antenna.