Time-setting in satellite positioning system receivers

An apparatus for use in an electronic device, the apparatus comprising:

• means for receiving a sequence of bits from a Satellite Positioning System (SPS) signal comprising one or more data sub-frames;
• means for selecting a time-setting algorithm from among a plurality of time-setting algorithms based, at least in part, on a time uncertainty;
• means for correlating a known and/or predicted bit sequence with said received SPS signal at multiple time-shifted hypotheses;
• means for verifying a maximum peak in comparison with other peak information resulting from said correlating;
• means for detecting a sub-frame preamble in said received SPS signal based, at least in part, on results from said verified maximum peak;
• and
• means for determining a SPS time based, at least in part, on a position of said detected sub-frame preamble in said sequence of bits,
• wherein at least one of said means for correlating and/or said means for verifying is affected by said time-setting algorithm.

An apparatus comprising:

• at least one processing unit to:
• obtain a sequence of bits from a Satellite Positioning System (SPS) signal comprising one or more data sub-frames;
• select a time-setting algorithm from among a plurality of time-setting algorithms based, at least in part, on a time uncertainty;
• correlate a known and/or predicted bit sequence with said received SPS signal at multiple time-shifted hypotheses;
• verify a maximum peak in comparison with other peak information resulting from said correlating;
• detect a sub-frame preamble in said received SPS signal based, at least in part, on results from said verified maximum peak;
• and determine a SPS time based, at least in part, on a position of said detected sub-frame preamble in said sequence of bits, wherein said time-selecting algorithm affects said at least one processing unit in performing at least one of said correlation and/or said verification.

An article comprising:

• a non-transitory computer readable medium having stored therein computer-implementable instructions executable by one or more processing units to:
• obtain a sequence of bits from a Satellite Positioning System (SPS) signal comprising one or more data sub-frames;
• select a time-setting algorithm from among a plurality of time-setting algorithms based, at least in part, on a time uncertainty;
• correlate a known and/or predicted bit sequence with said received SPS signal at multiple time-shifted hypotheses;
• verify a maximum peak in comparison with other peak information resulting from said correlating;
• detect a sub-frame preamble in said received SPS signal based, at least in part, on results from said verified maximum peak;
• and
• determine a SPS time based, at least in part, on a position of said detected sub-frame preamble in said sequence of bits,
• wherein said time-selecting algorithm affects said one or more processing units in performing at least one of said correlation and/or said verification.

A method comprising:

• with an electronic device:
• receiving a sequence of bits from a Satellite Positioning System (SPS) signal comprising one or more data sub-frames;
• selecting a time-setting algorithm from among a plurality of time-setting algorithms based, at least in part, on a type of demodulation performed on said SPS signal;
• correlating a known and/or predicted bit sequence with said received SPS signal at multiple time-shifted hypotheses;
• verifying a maximum peak in comparison with other peak information resulting from said correlating;
• detecting a sub-frame preamble in said received SPS signal based, at least in part, on results from said verified maximum peak;
• and
• generating one or more electrical signals representing an SPS time based, at least in part, on a position of said detected sub-frame preamble in said sequence of bits,
• wherein at least one of said correlating and/or said verifying is affected by said time-setting algorithm.

An apparatus for use in an electronic device, the apparatus comprising:

• means for receiving a sequence of bits from a Satellite Positioning System (SPS) signal comprising one or more data sub-frames;
• means for selecting a time-setting algorithm from among a plurality of time-setting algorithms based, at least in part, on a type of demodulation performed on said SPS signal;
• means for correlating a known and/or predicted bit sequence with said received SPS signal at multiple time-shifted hypotheses;
• means for verifying a maximum peak in comparison with other peak information resulting from said correlating;
• means for detecting a sub-frame preamble in said received SPS signal based, at least in part, on results from said verified maximum peak;
• and
• means for determining a SPS time based, at least in part, on a position of said detected sub-frame preamble in said sequence of bits,
• wherein at least one of said means for correlating and/or said means for verifying is affected by said time-setting algorithm.

An apparatus comprising:

• at least one processing unit to:
• obtain a sequence of bits from a Satellite Positioning System (SPS) signal comprising one or more data sub-frames;
• select a time-setting algorithm from among a plurality of time-setting algorithms based, at least in part, on a type of demodulation performed on said SPS signal;
• correlate a known and/or predicted bit sequence with said received SPS signal at multiple time-shifted hypotheses;
• verify a maximum peak in comparison with other peak information resulting from said correlating;
• detect a sub-frame preamble in said received SPS signal based, at least in part, on results from said verified maximum peak;
• and determine a SPS time based, at least in part, on a position of said detected sub-frame preamble in said sequence of bits, wherein said time-selecting algorithm affects said at least one processing unit in performing at least one of said correlation and/or said verification.

An article comprising:

• a non-transitory computer readable medium having stored therein computer-implementable instructions executable by one or more processing units to:
• obtain a sequence of bits from a Satellite Positioning System (SPS) signal comprising one or more data sub-frames;
• select a time-setting algorithm from among a plurality of time-setting algorithms based, at least in part, on a type of demodulation performed on said SPS signal;
• correlate a known and/or predicted bit sequence with said received SPS signal at multiple time-shifted hypotheses;
• verify a maximum peak in comparison with other peak information resulting from said correlating;
• detect a sub-frame preamble in said received SPS signal based, at least in part, on results from said verified maximum peak;
• and
• determine a SPS time based, at least in part, on a position of said detected sub-frame preamble in said sequence of bits,
• wherein said time-selecting algorithm affects said one or more processing units in performing at least one of said correlation and/or said verification.