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Ulysses HISCALE Data Analysis Handbook



4.5 Data System


4.5.10 Rate and Composition Aperture Data


Rate and CA data will be output as five sets of data, each set the result of one spin pair (spin group pair). Each spin pair produces 478 bytes of data. The sequence of data types for odd and even spins is shown in Table 4.15. Rate channels are P1 - P8, P1' - P8', E1 - E5; E1' - E5', FP6 - FP7, FP6' - FP7', DE1 - DE4, DE1 - DE4, S1, S2 and W1 - W8. CA channels are c1, c2, d1, d2, and P. Rate data will consist of four bits of exponent and four bits of mantissa: ABCD. EFGH. The value = A x 27 + ... + H x 20, where A is the MSB and H the LSB. CA channel P will define the data type represented by the pairs (C1, D1) and (C2, D2), and the event-priority schedule used to choose these events for sampling as shown in Figure 4.41.


Figure 4.41 CA priority byte


Figure 4.41



E(I,II) 2 E(I,II) 1
00 H
01 He
10 O
11 Fe
Schedule S1   0 0 1 1
S0   0 1 0 1
Priority 1 Fe O H He
  2 O Fe Fe Fe
  3 He H O O
  4 H He He H


Table 4.15 Science data rate and CA one spin pair  (same as Table 2.14)


The status trailer contains data to provide timing accuracy and indicate the validity of rate and CA data. The structure of the status trailer is shown below in Figure 4.42.


Figure 4.42a Status trailer format


Figure 4.42a



Figure 4.42b Status trailer format, continued


Figure 4.42b



Next: Chapter 4.5.11: Sectoring


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Updated 8/8/19, Cameron Crane


Manufacturer: ESA provided the Ulysses spacecraft, NASA provided the power supply, and various others provided its instruments.

Mission End Date: June 30, 2009

Destination: The inner heliosphere of the sun away from the ecliptic plane

Orbit:  Elliptical orbit transversing the polar regions of the sun outside of the ecliptic plane