The structure of CORONAS-Photon onboard telemetry and command systems

The structure of CORONAS-PhotonThe structure of CORONAS-Photon

onboard telemetry and command systems

Alexander Glyanenko, IAF MEPHI, Moscow, Russia.

Organization of Organization of electrical electrical links onboard the links onboard the satellitesatellite

Onboard Control Computer

Scientific Telemetry

System (SSRNI)

BUS-KF

Local network

Nataly-2M

Power and Control

System of satellite

Radioline 8,2 GHz(BIS-KF)

Command Radioline

Satellite Telemetry

System

Control Code Words, Data - 1553b

Data

Data, Time, Code Words

Temperature, analogs, other

sensors

Pinguin

Other scientific devices

Device N

Control Data

Pulse commands and power

2 frequencies7,68 or 15,36

Mbits/s

OOnboard nboard controlcontrolControl of onboard equipment (OE) spacecraft is made by an onboard complex

of control (OCC) which provides:- Reception from a ground complex of management (GCM) and direct delivery

to SD single and pulse commands of control (PCC) with rate is not more often, then 1 command in 2 sec;

- Reception from GCM frames of Control Data (FCD) with rate 1-2 per sec and their delivery as SD messages with volume up to thirty 16-th digit information words with set with GCM rate (0÷2000 ms). FCD are transferred aboard spacecraft by files. One file can contains from 1 up to 16 phrases (maximum). Each phrase will consist of 32 16-bits words. First and last words of a phrase are service - heading and the control sum of a phrase. Other words - details (if the data do not fill all of 30 words, other words are filled by zero). In total aboard spacecraft for a communication session can be transferred up to 56 Kbit information, i.e. no more than seven full (16 phrases) FCD files;

- Program control of SD with delivering (under the programs incorporated in OCC or under tasks from GCM in FCD) program pulse commands (PC) and program code commands of management;

- Delivery of phrases of the service information in volume up to thirty words of the data (without taking into account service words).

OOnboard nboard controlcontrol

Stage of experiment Initial inclusion and adjustment SD-complex,

duration till 90 days

Measurements period of SD-complex,

duration not less than 3 years

The maximal volume transmitted aboard spacecraft FCD for 1 session of communication

52 Kbit 52 Kbit

Maximum quantity of the single pulse (PCC) commands transmitted for 1 session of communication

44 PCC 44 PCC

Volume FCD and number of PCC for control of SD-complex, transmitted to one session of communication

52 Kbit, 30 PCC 52 Kbit, 30 PCC

Memory size of the RAM of OCC for storage FCD and for formation of the given program commands at crossing borders of adverse zones of supervision

24 Kbit 24 Kbit

Efficiency of management - time from the moment of data transfer to Command Center prior to the beginning of a communication session: at one session in day, no more at two sessions in day, no more

24 hour 12 hour 24 hour 12 hour

CommandsCommands

program pulse commands: Pulse with duration 0,1 0,3 sec, Ucom= +27(-3/+7)V.

Attention! Ground line for command must be decoupled with ground line of satellite power supply and with case of device!

Dry contacts – pulse on/off with duration 0,1 0,3 sec, or type of switch on/ switch off. (Example – shadow/light)

New type of command – bad/good (give us information about presence of satellite in high breadths.

CommandsCommands

Onboard Power SupplyOnboard Power Supply

Power SupplyPower Supply +27 (-3/+7)V+27 (-3/+7)V UUmaxmax=34,6 V (T<5s)=34,6 V (T<5s)

Attention! Ground line for power supply must be decoupled with ground line of satellite command

and with case of device!

Scientific telemetry System (SSRNI)Scientific telemetry System (SSRNI)

SSRNI is system, which provides:SSRNI is system, which provides:• Data acquisition from scientific devices and Data acquisition from scientific devices and

Satellite Telemetry System (Scientific Data)Satellite Telemetry System (Scientific Data)• Storage data in mass memory and Storage data in mass memory and

transmission this data to ground stationtransmission this data to ground station• Transmission of onboard time code (KBV) Transmission of onboard time code (KBV)

to scientific devicesto scientific devices• Transmission of control word (UKS) to Transmission of control word (UKS) to

scientific devicesscientific devices

Scientific telemetry System (SSRNI)Scientific telemetry System (SSRNI)

Reception of the scientific information from Scientific Reception of the scientific information from Scientific Devices (SD)Devices (SD) to SSRNI system is carried out by frames on to SSRNI system is carried out by frames on 960 bits in a consecutive code. Link speed for one channel- 960 bits in a consecutive code. Link speed for one channel-

62.5 kbits/s62.5 kbits/s or 125 kbitsor 125 kbits//ss. .

SSRNI Data Interface with scientific device SSRNI Data Interface with scientific device

1.1. All scientific devices (SD) in SSRNI has unique All scientific devices (SD) in SSRNI has unique personal number (Number of SSRNI Channel). Data personal number (Number of SSRNI Channel). Data and Control Cannels of SSRNI has the same numberand Control Cannels of SSRNI has the same number

2.2. SSRNI has 24 independent channels for SD.SSRNI has 24 independent channels for SD.

3.3. Total volume of mass memory in SSRNI is 1,5 GB. Total volume of mass memory in SSRNI is 1,5 GB. The memory allocation between SD is installed The memory allocation between SD is installed according to quotas. Quota is the maximum volume according to quotas. Quota is the maximum volume of Data, which may be stored in mass memory for of Data, which may be stored in mass memory for one session of observations. If volume is exceeded, one session of observations. If volume is exceeded, no more data from SD can be stored in SSRNI in no more data from SD can be stored in SSRNI in current session.current session.

SSRNI Data Interface with scientific deviceSSRNI Data Interface with scientific device

4. Fixed volume for data from STS – 55 Mbits4. Fixed volume for data from STS – 55 Mbits

5. Internal SSRNI data 1/64 from total data 5. Internal SSRNI data 1/64 from total data Volume.Volume.

6. In case of internal SSRNI error-free coding 6. In case of internal SSRNI error-free coding volume of mass memory decreases as 16:11volume of mass memory decreases as 16:11

7. 4 different quota tables, working table can be 7. 4 different quota tables, working table can be changed by commands from Earth.changed by commands from Earth.

8. Possibility to create special quota table for one 8. Possibility to create special quota table for one session.session.

SSRNI Data Interface with scientific SSRNI Data Interface with scientific devicedevice

Quota requests (preliminary)Quota requests (preliminary)

N SourceMaximum SSRNI data rate

For this SD (B/day) Quota (B/day)

1 Nataly-2М (R1+R2) 221184000 102297600

2 Nataly-2М (R3+R4) 221184000 102297600

3 Nataly-2М (BVRV) 55296000 13824000

5 Nataly-2М (L+T) 55296000 45977600

6 Nataly-2М (M+H) 55296000 22118400

7 Nataly-2М (N-γ) 221184000 221184000

9 PHOKA 55296000 1588224

10 BRM 221184000 100555776

11 Penguin-М 55296000 6337553

13 KONUS 1 55296000 8192000

14 KONUS 2 55296000 8192000

15 Electron-М-Pesca 55296000 14558430

16 STEP 55296000 10240000

19 RT2-1 55296000 5120000

20 RT2-2 55296000 5120000

21 TESIS-1 221184000 221184000

22 TESIS-2 221184000 221184000

23 TESIS-3 221184000 221184000

24 SOKOL 55296000 5120000

25 SSRNI 512000

26 STS 5529600

TOTAL: 1336275183

SSRNI Control and Time Interface with SDSSRNI Control and Time Interface with SD

For maintenance of time binding the scientific devices data and for control of scientific devices SSRNI provides delivery on the special multiplexed line with time division of special sendings of the consecutive code containing or the data on a code of onboard time (KBV), or control information (UKS). Each types of information sendings is synchronized by a corresponding signal of support («Synchro KBV» and «Synchro UKS »).

System SSRNI receives from Onboard Time System a 38-digit consecutive code of onboard time scale (OTS), as sequence of pulses with clock frequency 125 KHz, accompanied by labels “1 ms” and "1sec". System SSRNI carries out transformation of OTS code to format KBV and gives out to scientific devices.

KBV represents a 32-bit consecutive potential binary code in support synchronization pulses 62.5 KHz (signal “Clk U-K") and a signal Synchro KBV (a label – 1 ms) and labels 1 sec. Senior category KBV is given out to the first.


The system SSRNI carries out transformation of the The system SSRNI carries out transformation of the commands received on channel 1553b from onboard commands received on channel 1553b from onboard satellite computer, to 16-th digit control code words satellite computer, to 16-th digit control code words ((UKSUKS) ) and gives out to scientific devices.and gives out to scientific devices.UKSUKS represents 16-th digit code which is given out under represents 16-th digit code which is given out under the consecutive circuit accompanied by clock the consecutive circuit accompanied by clock pulses (signal “Clk U-K") and a strobe («Synchro UKS»). The strobe of the data is individual for each scientific device. The number of independent outputs of the control information corresponds to number of SD. The first bit of UKS is older bit.


Format of UKS from Format of UKS from SSRNI to SDSSRNI to SD

SSRNI Control and Time Interface with SDSSRNI Control and Time Interface with SDFormat of UKS from Format of UKS from SSRNI to SDSSRNI to SD

Number of a word

The note Information

1 MARKER 7C 6Eh

2 MARKER A1 2Ch

3 HEADING OF THE MESSAGE

Number of words N for device - 5 bits

4 DATA FOR DEVICE The first word for device

…

N+3 Last word for device

N+4 CRC The control sum of the message

For the control of all scientific devices (SD) of CORONAS-Photon the next For the control of all scientific devices (SD) of CORONAS-Photon the next resources are available:resources are available:

Up to 160 pulse commands with duration 0,1Up to 160 pulse commands with duration 0,10,3 sec and amplitude that is 0,3 sec and amplitude that is equals to satellite power; “dry contacts” – pulse on/off and (switch on)/(switch equals to satellite power; “dry contacts” – pulse on/off and (switch on)/(switch off) type (OCC→BUS-FM).off) type (OCC→BUS-FM).

Special commands “shadow/light” and “bad/good’ (location of the satellite in Special commands “shadow/light” and “bad/good’ (location of the satellite in high latitudes or in the SAA region), (OCC→BUS-FM).high latitudes or in the SAA region), (OCC→BUS-FM).

16-bits digital commands (UKS) to operate by scientific devices 16-bits digital commands (UKS) to operate by scientific devices (OCC→SSRNI by 1553b-channel).(OCC→SSRNI by 1553b-channel).

For data acquisition in CORONAS-Photon project the next resources of two For data acquisition in CORONAS-Photon project the next resources of two telemetry systems are used by SD:telemetry systems are used by SD:

Satellite Telemetry System (STS) – 131 digital, 34 analogs and 21 thermo-Satellite Telemetry System (STS) – 131 digital, 34 analogs and 21 thermo-sensors;sensors;

Scientific Telemetry System (SSRNI) with the next possibilities:Scientific Telemetry System (SSRNI) with the next possibilities: Up to 24 individual information channels for SD with link speed for one Up to 24 individual information channels for SD with link speed for one

channel - 62.5 kbits/s or 125 kbits/schannel - 62.5 kbits/s or 125 kbits/s Total mass memory up to 1.5 GB, Total mass memory up to 1.5 GB, the memory allocation between SD’s is the memory allocation between SD’s is

installed according to quotas.installed according to quotas. Additional data from STS throw OCC to SSRNI by 1553b–channel;Additional data from STS throw OCC to SSRNI by 1553b–channel; Ground data link with link speed 7.68 Mbits/s or 15,36 Mbits/s at frequency Ground data link with link speed 7.68 Mbits/s or 15,36 Mbits/s at frequency

8,2 GGz (depending on coding algorithm in the link session).8,2 GGz (depending on coding algorithm in the link session). Including into operational network units not only from scientific Including into operational network units not only from scientific

complex, but all needed units from satellite systems. It is allowed complex, but all needed units from satellite systems. It is allowed to realize a flexible, convenient infrastructure for management to realize a flexible, convenient infrastructure for management and data acquisition from scientific equipments and to expand and data acquisition from scientific equipments and to expand

opportunities of experiment.opportunities of experiment.

Thanks you for attentionThanks you for attention

SSRNI Data Interface with scientific deviceSSRNI Data Interface with scientific deviceData exchange between SD and SSRNIData exchange between SD and SSRNI

Data exchange between SD and SSRNI realises by the frames with volume 960 between SD and SSRNI realises by the frames with volume 960 bits. bits.

For transfer information SD should generate a signal «Data Ready» (DR) after will save up and it will be ready to transfer at least one frame of the information (960 bits). When SSRNI begin to read data from SD, it generate signal «Receive Data» (RD) and serial synchronization pulses «Clk Data». Signal DR should be established during a delay of reading data and during time of transfer of a frame (frames). SD must change it’s information on log”0”log”1” edge of pulse «Clk Data». The signal DR can be removed (be taken off) by SD at any time after the beginning of a transmitting of last frame, but not later than front of a pulse «Clk Data» of the last bit. Delivery of a signal «Clk Data» is accompanied by a signal «Receive Data», generated by SSRNI. Signal RD is established for the period of transfer of each frame. System SSRNI removes signal RD in intervals between accepted files. Maximal time of a pause between accepted files for one SD does not exceed 24 ms.

Parameters of SSRNI and SD signalsParameters of SSRNI and SD signals(Data Channel)(Data Channel)

The parameters of signals «Data Ready» The parameters of signals «Data Ready» and «Data» formed SD:and «Data» formed SD:

Level of log. «1» - from Level of log. «1» - from +2,7+2,7 up to + 5,5 V;up to + 5,5 V;Level of log. «0» - from 0 up to + 0,5 V;Level of log. «0» - from 0 up to + 0,5 V;Duration of edges - no more than 0,5 mks;Duration of edges - no more than 0,5 mks;Load on each signal:Load on each signal:Resistance - not less than 10 KOm;Resistance - not less than 10 KOm;Capacity (incl. capacity of cable) - no more Capacity (incl. capacity of cable) - no more

than 500 pF.than 500 pF.Everyone from signals «Data Ready» and Everyone from signals «Data Ready» and

«Data» should be transmitted «Data» should be transmitted simultaneously by two outputs (Out1 simultaneously by two outputs (Out1 and Out2) rather common wire. The and Out2) rather common wire. The question about galvanic decoupling question about galvanic decoupling between SD and SSRNI for separate between SD and SSRNI for separate instruments should be decided as agreed instruments should be decided as agreed with MEPhI.with MEPhI.

Parameters of signals «Receive Data» and Parameters of signals «Receive Data» and «Clk Data», formed by SSRNI:«Clk Data», formed by SSRNI:

Level of log. «1» - from Level of log. «1» - from +2,7+2,7 up to + 5,5 V;up to + 5,5 V;

Level of log. «0» - from 0 up to + 0,5 V;Level of log. «0» - from 0 up to + 0,5 V;

Duration of edges - no more than 0,5 mks;Duration of edges - no more than 0,5 mks;

Porosity of pulses «Receive Data» and «Clk Porosity of pulses «Receive Data» and «Clk Data» (during transmission of the block) Data» (during transmission of the block) - 2- 20,1;0,1;

Load on each signal:Load on each signal:

Resistance - not less than 10 KOmResistance - not less than 10 KOm;;

Capacity (incl. capacity of cable) - no more Capacity (incl. capacity of cable) - no more than 500 pF.than 500 pF.

Everyone from signals Everyone from signals ««Receive Receive Data» and Data» and ««Clk DataClk Data» » should be transmitted should be transmitted in in parallel on two independent lines.parallel on two independent lines.


For maintenance of time binding the scientific devices data and for control of scientific devices SSRNI provides delivery on the special multiplexed line with time division of special sendings of the consecutive code containing or the data on a code of onboard time (KBV), or control information (UKS). Each types of information sendings is synchronized by a corresponding signal of support («Synchro KBV» and «Synchro UKS »).

System SSRNI receives from Onboard Time System a 38-digit consecutive code of onboard time scale (OTS), as sequence of pulses with clock frequency 125 KHz, accompanied by labels “1 ms” and "1sec". System SSRNI carries out transformation of OTS code to format KBV and gives out to scientific devices.

KBV represents a 32-bit consecutive potential binary code in support synchronization pulses 62.5 KHz (signal “Clk U-K") and a signal Synchro KBV (a label – 1 ms) and labels 1 sec. Senior category KBV is given out to the first.


The system SSRNI carries out transformation of the The system SSRNI carries out transformation of the commands received on channel 1553b from onboard commands received on channel 1553b from onboard satellite computer, to 16-th digit control code words satellite computer, to 16-th digit control code words ((UKSUKS) ) and gives out to scientific devices.and gives out to scientific devices.

UKSUKS represents 16-th digit code which is given out under represents 16-th digit code which is given out under the consecutive circuit accompanied by clock the consecutive circuit accompanied by clock pulses (signal “Clk U-K") and a strobe («Synchro UKS»). The strobe of the data is individual for each scientific device. The number of independent outputs of the control information corresponds to number of SD.

The first bit of UKS is older bit.


– Details of transmission sinchronisationDetails of transmission sinchronisation

Parameters of SSRNI and SD signalsParameters of SSRNI and SD signals(Control and Time Channels)(Control and Time Channels)

Parameters of UKS-channel signals :Parameters of UKS-channel signals :

Level of log. «1» - from Level of log. «1» - from ++2,72,7 up to + 5,5 V;up to + 5,5 V;

Level of log. «0» - from 0 up to + 0,5 V;Level of log. «0» - from 0 up to + 0,5 V;

Duration of edges - no more than 0,5 mks;Duration of edges - no more than 0,5 mks;

Frequency of signal Frequency of signal ““Clk U-KClk U-K" " - 62,5 KHz;- 62,5 KHz;

Porosity of signal Porosity of signal ""Clk U-KClk U-K" " - 2±0.1;- 2±0.1;

Duration of a signal «Synchro UKS» - 256 Duration of a signal «Synchro UKS» - 256 mks;mks;

Load on each signal:Load on each signal:

Resistance - not less than 10 KOm;Resistance - not less than 10 KOm;

Capacity (incl. capacity of cable) - no more Capacity (incl. capacity of cable) - no more than 500 pF.than 500 pF.

Parameters of KBV-channel signals, and Parameters of KBV-channel signals, and also signals «Clk U-K», “Synchro also signals «Clk U-K», “Synchro KBV» («1 ns») and «1 sec» formed by KBV» («1 ns») and «1 sec» formed by system SSRNI:system SSRNI:

Level of log. «1» - from Level of log. «1» - from ++2,72,7 up to + 5,5 V;up to + 5,5 V;Level of log. «0» - from 0 up to + 0,5 V;Level of log. «0» - from 0 up to + 0,5 V;Duration of edges - no more than 0,5 mks;Duration of edges - no more than 0,5 mks;Frequency of signal Frequency of signal ““Clk U-KClk U-K" " - 62,5 KHz;- 62,5 KHz;Porosity of signal Porosity of signal ""Clk U-KClk U-K" " - 2±0.1;- 2±0.1;Duration of a signal «Synchro UKS» - 512 Duration of a signal «Synchro UKS» - 512

mks;mks;Duration of a signal «1 sec»-512 mks;Duration of a signal «1 sec»-512 mks;Loading on each signal:Loading on each signal:Resistance - not less than 10 KOm;Resistance - not less than 10 KOm;Capacity (incl. capacity of cable) - no more Capacity (incl. capacity of cable) - no more

than 500 pF.than 500 pF.Pulses of signal Pulses of signal ""Clk U-KClk U-K" " are transferred are transferred

only during transfer of code KBV.only during transfer of code KBV.

Recommended circuits of interfaces Recommended circuits of interfaces SSRNI SSRNI and SDand SD

Format of UKS from Format of UKS from SSRNI to SDSSRNI to SDNumber of a word The note Information

1 MARKER 7C 6Eh

2 MARKER A1 2Ch

3 HEADING OF THE MESSAGE

Number of words N for device - 5

bits

4 DATA FOR DEVICE

The first word for device

…

N+3 Last word for device

N+4 CRC The control sum of the message

Format of UKS from Format of UKS from SSRNI to SDSSRNI to SDNotes: Notes: 1. 1. The control sum of the message is formed SSRNI by

addition on the module 2 (excluding OR) for all words #3 - #(N+3).

2. Formats and structure of words transmitted on devices are defined by developers of devices.

3. If during a communication session meet M information blocks for one device, SSRNI forms M separate messages with a format determined in Table 1.5.3 for the given device.

4. The order of delivery UKS-NA in SD coincides with order of reception UKS-NA on 1553b (MKO).

5. If in a field Number of words for the device is value 0, the given message will consist only of a marker, heading and the control sum.

The period of message UKS-NA delivery is defined by the interface and cannot be less than 1 мs.

Прибор Количество команд за сеанс

мин Макс типичн

Начальный этап эксплуатации(до трех месяцев после пуска)

Электрон-М-Песка 0 4 3

Конус-РФ 2 6

Сокол 1 2 1

Пингвин-М 0 5

Наталья-2М 0 20

БРМ 0 5

ФОКА 0 5

СТЭП 0 2

ССРНИ 1 2

ТЕСИС 0 1

Суммарные потребности 52

Нормальный режим работы Электрон-М-Песка 0 1 1

Конус-РФ 1 2

Сокол 0 2 1



БРМ 0 3

ФОКА 0 3

СТЭП 0 1

ССРНИ 0 2

ТЕСИС 0 1

Суммарные потребности 1 28

Режим устранения неисправности

Электрон-М-Песка 1 4 3

Конус-РФ 1 6

Сокол 1 3 1



БРМ 0 5

ФОКА 0 3

СТЭП 2

ССРНИ 0 4

ТЕСИС 0 2

64

Прибор Количество слов за сеанс

мин Макс Макс в бит

Начальный этап эксплуатации(до трех месяцев после пуска)

Электрон-М-Песка 2 10240 (до 4 сеансов)

Конус-РФ 5 15

Сокол 0 0



БРМ 0 10

ФОКА 0 5

СТЭП 0 0

ССРНИ 0 30

Суммарная потребность

7 10240?170

2720 бит

Нормальный режим работы

Электрон-М-Песка 0 36

Конус-РФ 0 5

Сокол 0 0



БРМ 0 5

ФОКА 0 30

СТЭП 0 0

ССРНИ 0 30


0 196 3136 бит

Режим устранения неисправности

Электрон-М-Песка 2 10240 (до 4 сеансов)

Конус-РФ 10 20

Сокол 0 0

Пингвин-М 0 10080 (3 сеанса)

Наталья-2М 0 10080 (3 сеанса)

БРМ 0 10080 (3 сеанса)

ФОКА 0 10080 (3 сеанса)

СТЭП 0 0

ССРНИ 0 1 сеанс


12 4 сеанса Около 4 сеансов

The structure of CORONAS-Photon onboard telemetry and command systems

Documents

Transcript of The structure of CORONAS-Photon onboard telemetry and command systems