Utilities

gripspy.util.checksum

Adapted from the C implmentation written by Lammert Bies

gripspy.util.checksum.crc16(__Pyx_memviewslice data) → unsigned short

Compute the CRC16 checksum of a bytearray or equivalent. Because of Cython limitations, the input must be writeable (e.g., not a string)

gripspy.util.coincidence

gripspy.util.coincidence.find_nearest_in

For two sorted arrays a and b, returns a list of the indices of the nearest element in b for each element in a. The two arrays must be of the same numeric type.

gripspy.util.time

Module for time conversion

gripspy.util.time.oeb2utc(systime_array, seconds_of_gps_delay=6)[source]

Converts 6-byte system time (AKA gondola time) to UTC during the flight. Note that the detectors report a higher-precision “event” time that must first be divided by 10 to convert to system time.

Parameters:
  • systime_array (ndarray) – Array of system times (normally int64)
  • seconds_of_gps_delay (int) – Lag in seconds between GPS measurement and GPS recording (default: 6 seconds)
Returns:

utc_array – Array of UTC times datetime64
Return type:

ndarray

Notes

This conversion function works as intended for only system times during the flight. The flight computer was restarted on 2016 Jan 25, which leads to a discontinuity in system times, and this discontinuity is taken into account by the function.