Write a function process_space_data that receives a list of integer signal strengths recorded by a space probe. The function must return a tuple with three items:
- The total sum of all strengths.
- A new list containing only the positive strengths (zero is not positive).
- A list of (index, strength) pairs for every element, where the index starts at 0.
Example:
process_space_data([3, -1, 0, 5])
# returns (7, [3, 5], [(0, 3), (1, -1), (2, 0), (3, 5)])