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Satellites

Satellites. (They really are fun). General Information. Satellites are a combination of binary patterns that enable encrypted messages to be transferred from a satellite to the space station and from the space station back to the satellite.

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Satellites

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  1. Satellites (They really are fun)

  2. General Information Satellites are a combination of binary patterns that enable encrypted messages to be transferred from a satellite to the space station and from the space station back to the satellite. All satellites will have a name, message, answer, and destruct sequence. The satellite will be written in any combination of the three languages that are used most commonly these being ASCII, EBCDIC, and BAUDOT.

  3. General Info. (Con’t) Each number in a line of code is called a bit. All 8 bits in a line of a code add up to one byte. All individual code lines will be one byte long. The bits are labeled starting at 7 and ending up at 0 [ 7 6 5 4 3 2 1 0 ].

  4. ASCII (American Standard Code if Information Exchange) ASCII is a fairly simple code that always begins with at least one zero character Ex: 01000001 = A, 01010000 = P The ASCII table is read like any multiplication table. To decode a letter you put the first 4 numbers of the code line as the top part of the decoding table, and the second 4 numbers being the set along the left side of the table. The character the code represents is where the two cross.

  5. BAUDOT The BAUDOT language is somewhat similar to the ASCII language in that the first 3 characters of a BAUDOT code will be zeros. Ex: 00000011 = A, 00010110 = P The BAUDOT table is read by ignoring the first 3 zeros and then matching the remaining 5 numbers to that line on the table and then looking for what letter is next to that set of 5 numbers.

  6. EBCDIC EBCDIC codes are the only code that can begin with a 1 which makes them easily identifiable. Ex: 11000001 = A, 11010111 = P To read an EBCDIC code you first take the first two bits which are bits 7 and 6, you find their section and then in that section the next two bits (5 and 4) are the final column the letter will be in. The last 4 bits (3,2,1,0) are the ones listed on the far left, find the row that has those bits and then follow it over to where it intersects the appropriate column to decipher the code.

  7. Decoding Examples (Decode the Following) 01010011 01000001 01010100 01000101 01001100 01001100 01001001 01010100 01000101 S A T E L L I T E 00001001 00000110 00000101 00001110 00011000 00011110 00000001 00001010 00010101 D I S C O V E R Y 11000110 11011001 11000101 11000101 11000100 11010110 11010100 F R E E D O M

  8. Encoding Encoding works very similar to decoding, the only difference is you start with the letter and end up with the binary code. Encoding is important because once the astronauts have decoded the message of the satellite they must relay that message to Mission Control. Once Mission has the satellite message they can log onto the satellite database to access the satellite’s answer and destruct sequences. It is then up to the space station to encode the answer and for mission to encode the destruct. Once the astronauts have the answer encoded they simply need to enter that encoded message into the satellite terminal to restart the satellite.

  9. Encoding Examples (Encode the Following) ASCII BAUDOT EBCDIC D I S C O V E R Y 01000100 01001001 01010011 01000011 01001111 01010110 01000101 01010010 01011001 F R E E D O M 00001101 00001010 00000001 00000001 00001001 00011000 00011100 S A T E L L I T E 11100010 11000001 11100011 11000101 11010011 11010011 11001001 11100011 11000101

  10. Mission Control Procedures When Mission Control receives the decoded satellite message from the space station they need to make sure they have the satellite name and then log onto the Yubenhad Corp. Database. They can do that from any MISSION terminal. Login: yubenhad password: anewhope It will then ask you for the login again, the login and password are the same. Once you are logged in you have to login to the Database. Login: ybh password: ybh When it asks for the satellite name enter the name exactly as it appeared to the station. If you enter it incorrectly you will be logged off. When it tells you to enter the message enter it in exactly to receive the answer and destruct codes. If you dont finish a prompt within 60 seconds it logs off.

  11. Mission Control Procedures (Cont.) Once you have the answer give the station the answer message so they can encode it and you decode the destruct sequence.

  12. Space Station Procedures After you decode the satellite report the message to Mission so that they can get you the answer. Once you get the answer you need to encode it in the indicated language. After that has been encoded you have to log onto the satcomm login. Login: satcomm Password: station Choose the send acknowledgement option and then enter the first code where it says [byte 1] and press enter. Repeat for all codes. When you have entered all the codes correctly the satellite will restart and you have finished the process. If it is a satellite with a time limit you need to tell Mission Control at 3 minutes to impact if you can finish imputing the answer. If not they need to scramble the air national guard by two minutes left to destroy the satellite or it will impact Earth.

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