Cute-1.7 + APD II - FM Telemetry Format -

TOP How to Receive DAQ Data Format Format

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Conversion function is appeared as follows.

Gyro sensor temperature convertion function

From 42th byte to 44th byte are temperature data.
Please convert 42th byte to decimal number. It is Thermo₀.
Please convert 43th byte to decimal number. It is Thermo₁.
Please convert 44th byte to decimal number. It is Thermo₂.

ex. When these data cames, 0x12,0x34,0x56
Thermo₀ ＝ HEX2DEC(12) = 18
Thermo₁ ＝ HEX2DEC(34) = 52
Thermo₂ ＝ HEX2DEC(56) = 86

【Gyro temperature convertion functions】
Gyro_Temperature_X:[℃] = 1.315 * Thermo₀　－ 250.2
Gyro_Temperature_Y:[℃] = 1.314 * Thermo₁　－ 250.2
Gyro_Temperature_Z:[℃] = 1.282 * Thermo₂　－ 244.2
Gyro sensor convertion fuctor

Gyro sensor convertion fuctors are appeared.

【Gyro sensor convertion fuctors　function】

a₀ = 4.79592 * 10^-6 * Gyro_Temperature_X　+ 2.89902 * 10^-2
a₁ = 3.99077 * 10^-6 * Gyro_Temperature_Y　+ 2.91409 * 10^-2
a₂ = 3.28476 * 10^-6 * Gyro_Temperature_Z　+ 2.90810 * 10^-2

b₀ = -1.32759 * 10^-5 * Gyro_Temperature_X²　+ 1.94819 * 10^- 3 * Gyro_Temperature_X - 3.72796
b₁ = -7.24204 * 10^-6 * Gyro_Temperature_Y²　+ 6.72932 * 10^- 4 * Gyro_Temperature_Y - 3.75689
b₂ = -8.13262 * 10^-6 * Gyro_Temperature_Z²　- 1.80186 * 10^- 4 * Gyro_Temperature_X - 3.44149
Gyro sensor angular velocity convertion function

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Convertion function for obtaining angular elocity of satellite is appeared

4bytes are one group. It is composed by 40bytes of gyro data.

1st byte means number of data
Please convert 2nd byte to decimal number. It is Gyro_X.
Please convert 3rd byte to decimal number. It is Gyro_Y.
Please convert 4th byte to decimal number. It is Gyro_Z.

ex. When these data cames, 0x12,0x34,0x56,0x78,
Gyro_X ＝ HEX2DEC(34) = 52
Gyro_Y ＝ HEX2DEC(56) = 86
Gyro_Z ＝ HEX2DEC(78) = 120
となる。
【Gyro sensor angular velocity convertion function】

Gyro_Sensor_X [rad/s] = a₀ * Gyro_X ＋ b₀
Gyro_Sensor_Y [rad/s] = -{ a₁ * Gyro_Y ＋ b₁ }
Gyro_Sensor_Z [rad/s] = -{ a₂ * Gyro_Z ＋ b₂ }
Magnet sensor convertion function
Convertion function for obtaining magnet sensor data of satellite is appeared

2bytes are one group.

For obtainning MAG_X
Please convert 2bytes data to decimal number.
ex. When these data comes, 0x12,0x34, Plese convert follower format →「0x1234(hex)＝4660(decimal)」.
Please use same convertion when you want to obtain MAG_Y and MAG_Z.

【Magnet sensor convertion function】

MagnetSensor_X:[μT] = 0.0068 * MAG_X　－ 0.36119
MagnetSensor_Y:[μT] = －0.00675 * MAG_Z － 0.07804
MagnetSensor_Z:[μT] = 0.00673 * MAG_Y ＋ 0.11584

Cute-1.7 + APD II Project - FM Telemetry Format -

Small Satellite Program (SSP)

Laboratory for Space Systems (LSS), Tokyo Institute of Technology

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