Overview and Operations of FITSAT-1 (NIWAKA)

RAST2013 Istanbul13th June, 2013

Takushi Tanaka

FITSAT-projectFukuoka Institute of Technology

http://www.fit.ac.jp/~tanaka/fitsat.shtml

Missions of NIWAKA

High-speed transmission (5.84GHz, 115.2kbps)

Twinkle as 　　 an artificial star (first experiment)

Freq. = 5.84GHz RF-output = 2W DC-input = 15W Speed = 115.2kbps Band width = 300kHz Modulation: FSK (±50kHz)

First Mission: 5.8GHz module (Logical Product. Corp.)

　

Second Mission: Morse code mode, 10Hz mode

　

Green:230W 　　 　 Red:160W

Communication System

Antennas of NIWAKA

437MHz 1.26GHz 5.84GHz

Structures of NIWAKA

Cutting square pipe Top panel (+Z)

CameraHole

Side and Bottom

Side (-Y) 　　　　 　 　 　 Bottom panel (-Z)

CameraHole

Batteries

Rithium-ion battery (maxell INR18650PB2G) 1450mAH (sigle+3series) 3 ～ 4 V, max 25 A

Solar cells

2 cells x 4 sides (+X,+Y,-X,-Y) 4.7 V x 0.49 A ≒ 2.3 W (each side)

CPU board

RX-CPU, TX-CPU, Power controller, Sensor amp. 　

Inside (+X)

Inside(-Y)

Inside(-Z)

1.26GHz RX(behind –Z panel) 　　　 437MHz Ant. Flight Pin

Neogi.magnet behind PCB

Orbit and Posture

(North path)437MHz Ant.stands vertically.

(South path)5.8GHz Ant. facesto the ground st.

Ground Station

5.8GHzLNB

437MHz, 1.26GHz Yagi Antenna Parabola with Telescope

Beam Pattern

5.8G Patch 5.8G Parabola 435M Yagi

Tanegashima Isrand to ISS 2012.7.21

Deployment: 5th Oct. 2012, 00:44

Pictures from NIWAKA

First Picture

ドイツ　Bochum Observatory

AMSAT-DL team

LED light from NIWAKA

(Ebina City, Kanagawa Pref.)

(Mikame Town, Nishiyo City, Ehime Pref.)

(Dec. 14, 2012, Tadashi HAYASHI, Toyama Science Museum)

Telemetry by beacon

Temperatures around full sunshine by Colin, VK5HI

Voltage and Current around flashing LED

Current of 　　 Voltage of3 cell batteries 3 cell batteries

16th Jan. 2013 (6 sec sampling)

Temperatures around flashing LED

from shade to sunshine(1 cycle around the world)

1st Feb. 2013 (1 min. sampling)

Current 3 cell batt.

Voltage3 cell batt.

Strength of beacon signal

Changing sig. strength (437.250MHz,CW)

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 3rd Nov. 2012

Joachim Köppen DF3GJ Observatoire de Strasbourg

T = 28.5 sec 8th Nov. 2012

Voltage change of solar cells　　　　　　　　　　　　　　　　　　　　　　 6th Nov. 2012 (3

sec sampling)

３３秒で Z 軸中心に回転

X → Y → -X → -Y (left rotation) T = 33 (sec)

Voltage change of solar cells

　　 T = 12.3 (sec)

8th Feb. 2013 (1 sec sampling)

Rotation around Z-axis

Rotation

Period

Energy

Please watch NIWAKA light!

Send me report!

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