Overview

Overview

To store data from sensors, which are pressure sensor, accelerometer(3 axes), gyroscope(3 axes) and magnetoresistive sensor(3 axes)
into internal EEPROM and transmit them to the ground station.

Objective

1.Untill CANSAT being released from carrier, sampling rate of storing data into EEPROM is 50Hz for memorizing detailed data on launching.
After released, the sampling rate is 5Hz for long time memorizing.
2.To compare with two altitute data, which are measured from acceleremeter and pressure sensor.
3.To compare with two attitude data , which are measured from gyroscope and magnetoresistive sensor.
4.Experiment for high speed transmission

Signification

Fundamental experiment for attitude control of micro-satellite.
For our future micro-satellite development, Analysis of micro satellite motion which is determined from acceleration and attitude angle.
Research on satellite inner structure.

CANSAT 2 "AQUARIUS" Specification

shape		66mm(diameter) x 123mm(height) Can shape(350ml)
Material		A6063,A5052
whight	Total	367.7g
	Can	7.6g
	Structure	114.8g
	Transceiver	32.1g
	Pressure Circuit	17.9g
	Gyroscope Circuit	17.0g
	Magnetoresistive Sensor Circuit	14.0g
	Accelerometer Circuit	14.0g
	OBC Circuit	19.6g
	Memory Circuit	18.9g
	TNC Circuit	21.6g
	Battery (Panasonic CR-P2)	37.5g(a piece)
	Antenna	15.2g
Sensors		Pressure Sensor,Accelerometer(3 axes), Gyroscope(3 axes),Magnetoresistive Sensor(3axes)
MPU		PIC16F877
Memory		24LC256 Serial EEPROM 256kbit
Current Consumption		about 1A(max)
Battery		6.0V 2600mAh(Panasonic CR-P2 Parallel Circuit)
Communication Method		Packet Operation (Tokyo Institute of Technology Original Protcol)
Data Rate		1200bps
Transmitter		300mW (Standard C501)
Frequency Range		145.8MHz
Launch Vehicle		Amateur Rocket
Launch Place		The Blackrock desert, Nevada State, USA
Launch Date		7/28/2000

CANSAT 2 "AQUARIUS" Appearance

CANSAT 2 "AQUARIUS" System Block Diagram

CANSAT 2 "AQUARIUS" Experimental Sequence

Turn main switch on before CANSAT being inserted into carrier. (*photo 1)

Main switch being turned on, data of accelerometer starts to be stored on 50Hz sampling rate.
If rocket launch is delayed with some trouble, memory is not filled, for sensor data are overwrittten into memory in this time.

Launch!

CANSAT is released from carrier.

CANSAT being released from carrier, micro switch is turned on, and after about 30 second sampling rate is changed from 50Hz to 5Hz and overwrite is finish too.

Start to transmit sensor data to the ground station.

After sampling rate is changed, sensor data starts to be transmitted to the ground station with Titech Original Protocol, which is
high-speed rate packet included error-correcting code.

Landing! Collect CANSAT.

CANSAT being collected, main switch is turned off to stop memorizing and transmitting.


Photo 1 (Main Switch)	Photo 2 (Micro Switch)

CANSAT 2 "AQUARIUS" System Success Level

Success Level 1
To store data of all sensors into memory.

Success Level 2
To store data of all sensors into memory and transmit them to the ground station.

Success Level 3
To store data of all sensors into memory, transmit them to the ground station and analyze memory data after collecting CANSAT.

CANSAT 2 "AQUARIUS" Characteristic

For easy assembly and high density, layer structure design.(*photo 3)

Test socket on bottom surface enables to check inner sensor and battery condition after assembly.

If launching vibration turns micro switch off at intervals, sampling rate is not changed on account of large capacity condenser(0.22F).


Photo 3 (Layer Structure)	Photo 4 (Test Socket)

For More Information

SRTL Director
Prof. Saburo MATUNAGA Matunaga.Saburo@horse.mes.titech.ac.jp

SRTL ARLISS 2000 CANSAT TEAM Student Director
Koji NAKAYA koji@horse.mes.titech.ac.jp

CANSAT 2 "AQUAIRIUS" Project Manager
Hideto OKADA eightok@horse.mes.titech.ac.jp

CANSAT 2 "AQUARIUS" Project Member
Hideto OKADA eightok@horse.mes.titech.ac.jp
Masafumi IAI miai@mes.titech.ac.jp
Naoki MIYASHITA miyashita@horse.mes.titech.ac.jp

Tokyo Institute of Technology SRTL Web site
http://horse.mes.titech.ac.jp/srtlssp