250
PART III/APPLICATIONS
Major Frame
=~ .... ~ .... ......................... ..... . .... . .... ~ ..... . ....... . ......... . ....... o .....
. ~
i Synch Word
1
2 3 9 9 9 SprCom 1 SubFrame SprCom 2 - 9 - n-1 i
Synch Word
1
2 3 - - - SprCom 1 SubFrame SprCom 2 n-1 :
~ 9
: Synch Word
1
2 3 9 9 9 SprCom 1 SubFrame SprCom 2 . . . n-1 :
9 ~
9 ~
9 ~
. ~
9 ~
- ~
=l
: :
: 9
- a
. .
o .
9 .
.
: .~...Synch Word
1
2 3 9 9 . SprCom 1 SubFrame SprCom 2 . . . n-1 . !
........................................................................
SubFrame
FIGURE 11.4
Major flame structure for telemetry data [3].
sensor 1
sensor 2
sensor 3
sensor 4
sensor 1
sensor 2
sensor 3
sensor 4
minor frame 1
minor frame "m"
FIGURE 11.5
Minor frame structure for telemetry frames [3].
11.2 ISSUES INVOLVED IN COMPRESSION OF TELEMETRY
11.2.1 Why Use Compression on Telemetry
Bandwidth is a precious commodity. Bandwidth is the amount of frequency space that a signal
takes to transmit its information. There are several different definitions of bandwidth. Two common
definitions are the 3-dB bandwidth and the null-to-null bandwidth. For a given power spectrum
of a signal, the 3-dB bandwidth is where the signal power is down 3 dB from the maximum.

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