Using a Magnetic Recording for Authentication

One or more computer-readable non-transitory storage media embodying software that is operable when executed to:

• access a first series of first magnetic values that represents a first magnetic recording that comprises a first set of first magnetic measurements that are each represented by one of the first magnetic values;
• access a second series of second magnetic values that represents a second magnetic recording that comprises a second set of second magnetic measurements that are each represented by one of the second magnetic values;
• approximately align the first and second series with each other;
• calculate a difference between the first and second series as aligned with each other;
• determine a similarity between the first and second series based on the difference;
• and
• perform navigation or localization based on the determined similarity.

A system comprising:

• one or more processors;
• and
• one or more computer-readable non-transitory storage media coupled to one or more of the processors and comprising instructions operable when executed by one or more of the processors to cause the system to:
• access a first series of first magnetic values that represents a first magnetic recording that comprises a first set of first magnetic measurements that are each represented by one of the first magnetic values;
• access a second series of second magnetic values that represents a second magnetic recording that comprises a second set of second magnetic measurements that are each represented by one of the second magnetic values;
• approximately align the first and second series with each other;
• calculate a difference between the first and second series as aligned with each other;
• determine a similarity between the first and second series based on the difference;
• and
• perform navigation or localization based on the determined similarity.

A system comprising:

• means for accessing a first series of first magnetic values that represents a first magnetic recording that comprises a first set of first magnetic measurements that are each represented by one of the first magnetic values;
• means for accessing a second series of second magnetic values that represents a second magnetic recording that comprises a second set of second magnetic measurements that are each represented by one of the second magnetic values;
• means for approximately aligning the first and second series with each other;
• means for calculating a difference between the first and second series as aligned with each other;
• means for determining a similarity between the first and second series based on the difference;
• and
• means for performing navigation or localization based on the determined similarity.