A nano Satellite

Developed by Indian Institute of Technology  Bombay, Mumbai, under the technical guidance and support from ISRO

Mission objectives

To measure Total Electron Count (TEC) of ionosphere over India and Paris with a resolution 1km x 1km location grid

Payload

An instrument consisting of two monopole antennae transmitting linear polarized waves at frequencies 145.98 MHz and 437.455 MHz for measurement of TEC of ionosphere.

Structure

Satellite dimensions:  305 mm x 335 mm x 466 mm

Material:   AL6061-T6 for side panels

Satellite mass:  ~10.7 kg (with IBL-230 separation system Fore End Ring)

Attitude stabilization system

3 axis attitude stabilization

Pointing Accuracy:   = ±10^o (about all 3 axes)

Drift rate:   = ±0.01^o/s (max.) (about all 3 axes)

Sensors:

1) Tri-axial magnetometer

     Range: ±2 G, Resolution: ±75 µG, Error (1s): 0.1 mG

2) 6 Sun-sensors (LEOS) mounted in orthogonal pairs on three Aluminum housings

     FOV: ±85^o

3) 12-Channel Global Positioning System (GPS) receiver (Accord)

• Cold start  time: 75 s
• Position and velocity accuracy (1s):  10-15 m, 0.12-0.15 m/s

Actuator:  Magnetic torquers (0.95 Am², 3 Nos.)

On-board computer

ATmega-128 Microcontroller

16 MIPS throughout at 16 MHz, 128 kB on-chip Flash & 4 kB on-chip EEPROM.

On-chip watchdog timer to restart microcontroller in case of lockup

Storage system on EEPROM (I²C interface)

Real-Time-Clock, 8 MHz Crystal

House-keeping Sensors

3 Voltage & 2 Current sensors

4 Temperature sensors

RF Communication

Amateur frequency band

Uplink and Downlink Frequency (half duplex):  437.455 MHz

Antennas:  Three monopole antennas

• Uplink (UHF)
• Downlink (UHF)
• Beacon (VHF)

Beacon:  145.98 MHz, CW, Morse code, 35 words/minute, 200 mW Tx. power

Downlink (Modulation, Tx. power & data rate):  FSK, 80 mW & 1200 bps

Uplink (Modulation, Rx. sensitivity & data rate):  FSK, -118 dBm & 1200 bps

Battery

Li-ion cells pack, 2S-3P configuration

Capacity:  7800 mAh

Solar Array

Distribution:  Total 4 solar panels. Single junction Ga-As body mounted solar cells with 11S-4P configuration on three sides (sun-side, leading and lagging sides) and 11S-3P configuration on zenith side.

Power generation:  10 W (average)

Thermal management

Passive thermal control system

Satellite Separation System

IBL-230 (ISRO-VSSC developed and qualified)

Altitude/ orbit

 ~670 km, Polar

Inclination

98.165^o

Launch date & lift-off time

September 26, 2016, 9:17 Hrs IST

Launch vehicle

PSLV-C35

Launch site

SHAR Centre, Sriharikota, India