Cross-correlation mitigation method and apparatus for use in a global positioning system receiver

An apparatus comprising:

• means for receiving signals indicative of communication information and signals indicative of location information;
• means for processing the communication information;
• means for performing a higher mode search, for a first length of time, using a higher mode search length and a higher mode signal detection threshold to detect one or more received signals indicative of location information;
• means for performing a lower mode search after performance of the higher mode search, for a second length of time, using a lower mode search length and a lower mode signal detection threshold to detect one or more received signals indicative of location information, wherein the second length of time is greater than the first length of time, the lower mode search being performed to detect one or more received signals not detected with a signal strength above a threshold level during the performance of the higher mode search;
• and
• means for determining cross correlation between at least one signal detected using the higher mode search and at least one signal detected using the lower mode search.

A method, comprising:

• receiving signals indicative of communication information and signals indicative of location information;
• performing a higher mode search, for a first length of time, using a higher mode search length and a higher mode signal detection threshold to detect one or more received signals indicative of the location information;
• performing a lower mode search after performance of the higher mode search, for a second length of time, using a lower mode search length and a lower mode signal detection threshold to detect one or more received signals indicative of the location information, wherein the second length of time is greater than the first length of time, the lower mode search being performed to detect one or more received signals not detected with a signal strength above a threshold level during the performance of the higher mode search;
• and
• determining cross correlation between at least one signal detected using the higher mode search and at least one signal detected using the lower mode search.

An article comprising:

• a storage medium comprising machine-readable instructions stored thereon which, if executed by a processor, are adapted to enable the processor to:
• perform a higher mode search of signals indicative of communication information and signals indicative of location information, for a first length of time, using a higher mode search length and a higher mode signal detection threshold to detect one or more received signals indicative of location information;
• perform a lower mode search after performance of the higher mode search, for a second length of time, using a lower mode search length and a lower mode signal detection threshold to detect one or more received signals indicative of location information, wherein the second length of time is greater than the first length of time, the lower mode search being performed to detect one or more received signals not detected with a signal strength above a threshold level during the performance of the higher mode search;
• and
• determine cross correlation between at least one signal detected using the higher mode search and at least one signal detected using the lower mode search.