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lbaops:expres:mark5bformat
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Mark5B disk data format
Taken from Mark5B System User's Manual (9 June 2006) Section 5.
Data on disk is divided into equal-length disk frames (DF). Each DF has a header of 4 32-bit words followed by 2500 32-bit words of data (10000 bytes). The DF boundary is aligned with the UT second tick.
Disk Frame Header
| Word 0 | Synchronization word (0xABADDEED) |
| Word 1 | Bits 31-16: User specifed |
| Bit 15: T - tvg data (test data if set) | |
| Bits 14-0: DF # within second | |
| Word 2-3 | VLBA BCD Time code and 16 bit CRC |
| Sync word (32 bit) | ||
| User-specifed (16 bits) | T | Frame# within second (starting at 0) |
| VLBA BCD Time code word 1 ('JJJSSSSS') | ||
| VLBA BCD Time code word 2 (16 bit) ('.SSSS') | CRC 16 bit | |
Disk Data Format
Raw VLBI data is packed within a 32 bit word, with the earliest time sample corresponding to the least significant bits .
lbaops/expres/mark5bformat.txt · Last modified: 2015/12/18 16:38 by 127.0.0.1
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