12-12-2013 дата публикации
Номер: US20130328720A1
A method of recording satellite signals for later processing to derive position information. According to one aspect, the method comprises receiving and digitising first and second satellite signals using a first set of parameters; and receiving and digitising third and fourth satellite signals using a second set of parameters. A first time interval between the first and second satellite signals is longer than a second time interval between the reception of the third and fourth satellite signals. The first set of parameters is associated with relatively higher resource usage, while the second set of parameters is associated with relatively lower resource usage. 1. A method of recording satellite signals for later processing to derive position information , the method comprising:{'b': 210', '212', '214, '(i) receiving () and digitising () first satellite signals using a first set of parameters, to produce a first block of satellite signal samples, and storing () the first block in a memory;'}{'b': 230', '232', '234, '(ii) receiving () and digitising () second satellite signals using the first set of parameters, to produce a second block of satellite signal samples, and storing () the second block in the memory;'}{'b': 240', '242', '244, '(iii) receiving () and digitising () third satellite signals using a second set of parameters, to produce a third block of satellite signal samples, and storing () the third block in the memory; and'}{'b': 260', '262', '264, '(iv) receiving () and digitising () fourth satellite signals using the second set of parameters, to produce a fourth block of satellite signal samples, and storing () the fourth block in the memory,'}wherein a first time interval between the reception of the first and second satellite signals is longer than a second interval between the reception of the third and fourth satellite signals,the duration of each of the first and second intervals is predetermined, andthe first and second sets of parameters are chosen ...
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