Telemetry Packets

This appendix lists all the telemetry packets that OBDH can transmit upon telecommand request by the RF links. The fields and length of each type of packet is also presented.

EDC Information

Telemetry packages from EDC can be seen in Table 18. This data can be requested through the “Get Payload Data” and “Data Request” telecommands, for more information about them see Telecommands. PTT packets from the Sistema Brasileiro de Coleta de Dados (SBCD) are seen in Table 23.

Table 18 EDC information packet.

Position

Content

Data type

Len. [bytes]

0

System time on which EDC data was last read

uint32

4

HK Info

4

Time of EDC housekeeping reading since J2000 epoch

uint32

4

8

Elapsed time since last reset

uint32

4

12

Digital circuitry current supply in mA

uint16

2

12

Analog circuitry supply in mA

uint16

2

16

System voltage supply in mV

uint16

2

18

EDC board temperature + \(40\) in Celsius

uint8

1

19

RF front end LO…

uint8

1

20

RMS level at front-end output

uint16

2

22

Generated PTT packages since

uint32

4

26

Maximum number of active PTT decoder channels

uint8

1

27

Number of double bit errors detected

uint8

1

System State

28

Time of EDC state reading since J2000 epoch

uint32

4

32

Number of PTT Package available for reading

uint8

1

33

PTT decoder task status

uint8

1

34

ADC sampler state

uint8

1

35

Payload ID (EDC_1 or EDC_2)

uint8

1

Total

-

-

36

OBDH Information

Telemetry packages from OBDH can be seen in Table 19. This data can be requested through the “Data Request” telecommands, for more information about it, see Telecommands.

Table 19 OBDH data packet.

Position

Content

Data type

Len. [bytes]

0

System time

uint32

4

4

\(\mu\)C temperature in Kelvin

uint16

2

6

\(\mu\)C current supply in mA

uint16

2

8

\(\mu\)C voltage supply in mV

uint16

2

10

Reset counter

uint16

2

12

Last reset cause ID

uint8

1

13

Last valid TC ID

uint8

1

14

Antenna deployment attempts counter

uint8

1

15

Initial hibernation time count (minutes)

uint8

1

16

Hardware version

uint8

1

17

Firmware version

uint32

4

21

Operation mode

uint8

1

22

System time of last mode change

uint32

4

26

Current operation mode duration

uint32

4

30

Initial hibernation executed

uint8

1

31

Antenna deployment executed

uint8

1

32

Hibernation enabled

uint8

1

33

Current main EDC

uint8

1

34

General telemetry state

uint8

1

35

Data log last written flash page

uint32

4

39

SBCD packets last written flash page

uint32

4

43

Last position determination timestamp

uint32

4

47

Satellite’s latitude

int16

2

49

Satellite’s longitude

int16

2

51

Satellite’s altitude

int16

2

53

Last TLE update timestamp

uint32

4

57

Last sensor readings timestamp

uint32

4

61

Main payload state

uint8

1

62

Secondary payload state

uint8

1

63

Remaining hibernation time in sec.

uint32

4

67

Timestamp of the last TC reception in sec.

uint32

4

71

Battery critical level threshold in mV

uint16

2

73

Last valid mode transition event ID

uint16

2

75

Experiment enable mode

uint8

1

76

EPS beacon enabled

uint8

1

77

Timestamp when commission mode will timeout

uint32

4

81

Next scheduled TC execution timestamp

uint32

4

85

TC queue size

uint8

1

86

Binary TLE

uint8[]

50

Total

-

-

136

EPS Information

Telemetry packages from EPS can be seen in Table 20. This data can be requested through the “Data Request” telecommands, for more information about it, see Telecommands.

Table 20 EPS data packet.

Position

Content

Data type

Len. [bytes]

0

System time on which EPS was last read

uint32

4

4

EPS system time

uint32

4

8

EPS \(\mu\)C temperature in Kelvin

uint16

2

10

EPS Circ. and Beacon \(\mu\) current in mA

uint16

2

12

Last reset cause ID

uint8

1

13

Reset counter

uint16

2

15

Solar panel -Y +X voltage in mV

uint16

2

17

Solar panel -X +Z voltage in mV

uint16

2

19

Solar panel -Z +Y voltage in mV

uint16

2

21

Solar panel +X current in mA

uint16

2

23

Solar panel -X current in mA

uint16

2

25

Solar panel +Y current in mA

uint16

2

27

Solar panel -Y current in mA

uint16

2

29

Solar panel +Z current in mA

uint16

2

31

Solar panel -Z current in mA

uint16

2

33

MPPT 1 duty cycle in %

uint8

1

34

MPPT 2 duty cycle in %

uint8

1

35

MPPT 3 duty cycle in %

uint8

1

36

Total solar panels output voltage after MPPT in mV

uint16

2

38

Main power bus voltage in mV

uint16

2

40

RTD0 temperature in K

uint16

2

42

RTD1 temperature in K

uint16

2

44

RTD2 temperature in K

uint16

2

46

RTD3 temperature in K

uint16

2

48

RTD4 temperature in K

uint16

2

50

RTD5 temperature in K

uint16

2

52

RTD6 temperature in K

uint16

2

54

Battery voltage in mV

uint16

2

56

Battery current in mA

int16

2

58

Battery average current in mA

int16

2

60

Battery accumulated current in mA

uint16

2

62

Battery charge in mAh

uint16

2

64

Battery monitor temperatura in Ke

uint16

2

66

Battery monitor status register

uint8

1

67

Battery monitor protection register

uint8

1

68

Battery monitor cycle counter

uint8

1

69

Battery monitor RAAC in mAh

uint16

2

71

Battery monitor RSAC in mAh

uint16

2

73

Battery monitor RARC in %

uint8

1

74

Battery monitor RSRC in %

uint8

1

75

Battery heater 1 duty cycle in %

uint16

2

77

Battery heater 2 duty cycle in %

uint16

2

79

MPPT 1 mode

uint8

1

80

MPPT 2 mode

uint8

1

81

MPPT 3 mode

uint8

1

82

Battery heater 1 mode

uint8

1

83

Battery heater 2 mode

uint8

1

Total

-

-

84

TTC Information

Telemetry packages from TTC can be seen in Table 21. This data can be requested through the “Data Request” telecommands, for more information about it, see Telecommands.

Table 21 TTC data packet.

Position

Content

Data type

Len. [bytes]

0

System time on which TTC was last read

uint32

4

4

TTC system time

uint32

4

8

Reset counter

uint16

2

10

Last reset cause ID

uint8

1

11

\(\mu\)C voltage supply in mV

uint16

2

13

\(\mu\)C current supply in mA

uint16

2

15

\(\mu\)C temperature in Kelvin

uint16

2

17

Input voltage of the radio in mV

uint16

2

19

Input current of the radio in mA

uint16

2

21

Temperature of the radio in K

uint16

2

23

Last valid telecommand (uplink packet ID)

uint8

1

24

RSSI of the last valid telecommand.

uint16

2

26

Temperature of the antenna module in K

uint16

2

28

Antenna status

uint16

2

30

Antenna deployment status

uint8

1

31

Antenna deploymaent hibernation status

uint8

1

32

TX packet counter

uint32

4

36

RX packet counter

uint32

4

Total

-

-

40

Antenna Information

Telemetry packages from Antenna can be seen in Table 22. This data can be requested through the “Data Request” telecommands, for more information about it, see Telecommands.

Table 22 Antenna data packet.

Position

Content

Data type

Len. [bytes]

0

System time on which TTC was last read

uint32

4

4

Antenna status code

uint16

2

6

Antenna 1 status

uint8

1

7

Antenna 1 timeout

uint8

1

8

Antenna 1 burning

uint8

1

9

Antenna 2 status

uint8

1

10

Antenna 2 timeout

uint8

1

11

Antenna 2 burning

uint8

1

12

Antenna 3 status

uint8

1

13

Antenna 3 timeout

uint8

1

14

Antenna 3 burning

uint8

1

15

Antenna 4 status

uint8

1

16

Antenna 4 timeout

uint8

1

17

Antenna 4 burning

uint8

1

18

Antenna ignoring switches

uint8

1

19

Antenna independent burn

uint8

1

20

Antenna armed

uint8

1

21

Antenna temperature

uint16

2

Total

-

-

23

SBCD Packets

Telemetry packages from the SBCD can be seen in Table 23. This data can be requested through the “Data Request” telecommands, for more information about it, see Telecommands.

Table 23 SBCD PTT data packet.

Position

Content

Data type

Len. [bytes]

0

PTT signal receiving time (J2000 epoch)

uint32

4

4

PTT Error code

uint8

1

5

Carrier frequency

int32

4

9

Carrier amplitude at ADC interface output

uint16

2

11

User messsage length in bytes

uint8

1

12

User message

uint8[ ]

1 to 36

Total

-

-

12 to 48