| 摘要 |
A satellite signal acquisition and measurement apparatus and process has the capability of quickly acquiring multiple satellite signals and performing measurements based on the acquired signal (such as time and range measurements) with a high level of computational efficiency. A sample comparison process is carried out, wherein a sample length of a satellite's signal is received and compared with all possible sample lengths of each satellite's code. However, instead of comparing the satellite signal sample length with each possible sample length at each possible frequency, a modified sample comparison approach is carried out. That is, after at least one satellite has been acquired, the frequency of the next satellite signal to be acquired is assumed to be within a limited range of frequencies determined from statistical probabilities based on the frequency of the previous signal acquisition(s). By narrowing the range of frequencies for the next satellite signal to be acquired, the modified process minimizes the number of comparison computations required to identify the received signal sample length. Such satellite acquisition apparatus may operate independent of navigational calculation functions to acquire as many satellite signals as possible, as quickly as possible.
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