Method, system and computer program product for performing correlation in a positioning system

Apparatus for receiving radio signals comprising:

• a receiver configured to receive a signal from one or more remote sources;
• a motion module configured to determine motion of the receiver;
• a direction determination unit configured to determine a first direction and a second direction, wherein signals received at the receiver along the first direction are desired to be enhanced and signals received at the receiver along the second direction are desired to be suppressed;
• a local signal generator configured to provide a local signal;
• a phasor generation unit configured to:
• obtain first and second phasor sequences indicative of the motion of the receiver in the first and second directions respectively, and generate a third phasor sequence based on a weighted combination of the first and second phasor sequences;
• and
• a correlation unit configured to provide a correlation signal using the third phasor sequence, wherein providing the correlation signal comprises correlating the local signal with the received signal, and combining and the result of the correlation with the third phasor sequence, such that a signal received along the second direction is suppressed relative to a signal received along the first direction.

An apparatus for receiving radio signals comprising:

• a processor;
• and
• a memory accessible to the processor, the memory having stored therein at least one of programs or instructions executable by the processor to configure the apparatus to:
• receive, at a receiver, a signal from one or more remote sources;
• determine motion of the receiver;
• determine a first direction, wherein signals received at the receiver along the first direction are desired to be enhanced;
• determine a second direction, wherein signals received at the receiver along the second direction are desired to be suppressed;
• obtain first and second phasor sequences indicative of the motion of the receiver in the first and second directions respectively;
• generate a third phasor sequence based on a weighted combination of the first and second phasor sequences;
• provide a local signal;
• and
• provide a correlation signal using the third phasor sequence, wherein providing the correlation signal comprises correlating the local signal with the received signal, and combining the result of the correlation with the third phasor sequence, such that a signal received along the second direction is suppressed relative to a signal received along the first direction.

A method performed in a positioning system, comprising:

• receiving, at a receiver, a signal from one or more remote sources;
• determining motion of the receiver;
• determining a first direction, wherein signals received at the receiver along the first direction are desired to be enhanced;
• determining a second direction, wherein signals received at the receiver along the second direction are desired to be suppressed;
• obtaining first and second phasor sequences indicative of the motion of the receiver in the first and second directions respectively;
• generating a third phasor sequence based on a weighted combination of the first and second phasor sequences;
• providing a local signal;
• combining one of the local signal or the received signal with the third phasor sequence;
• and
• providing a correlation signal using the third phasor sequence, wherein providing the correlation signal comprises, after the combination, correlating the local signal with the received signal, such that a signal received along the second direction is suppressed relative to a signal received along the first direction.

An apparatus for receiving radio signals comprising:

• a receiver configured to receive a signal from one or more remote sources;
• a motion module configured to determine motion of the receiver;
• a direction determination unit configured to determine a first direction and a second direction, wherein signals received at the receiver along the first direction are desired to be enhanced and signals received at the receiver along the second direction are desired to be suppressed;
• a local signal generator configured to provide a local signal;
• a phasor generation unit configured to:
• obtain first and second phasor sequences indicative of the motion of the receiver in the first and second directions respectively,
• generate a third phasor sequence based on a weighted combination of the first and second phasor sequences;
• and
• combine one of the local signal or the received signal with the third phasor sequence;
• and
• a correlation unit configured to provide a correlation signal using the third phasor sequence, wherein providing the correlation signal comprises, after the combination, correlating the local signal with the received signal, such that a signal received along the second direction is suppressed relative to a signal received along the first direction.

An apparatus for receiving radio signals comprising:

• a processor;
• and
• a memory accessible to the processor, the memory having stored therein at least one of programs or instructions executable by the processor to configure the apparatus to:
• receive, at a receiver, a signal from one or more remote sources;
• determine motion of the receiver;
• determine a first direction, wherein signals received at the receiver along the first direction are desired to be enhanced;
• determine a second direction, wherein signals received at the receiver along the second direction are desired to be suppressed;
• obtain first and second phasor sequences indicative of the motion of the receiver in the first and second directions respectively;
• generate a third phasor sequence based on a weighted combination of the first and second phasor sequences;
• provide a local signal;
• combine one of the local signal or the received signal with the third phasor sequence;
• and
• provide a correlation signal using the third phasor sequence, wherein providing the correlation signal comprises, after the combination, correlating the local signal with the received signal, such that a signal received along the second direction is suppressed relative to a signal received along the first direction.