Integrity monitoring in a position location system utilizing knowledge of local topography
AssigneeQUALCOMM Incorporated
InventorPeter Gaal
Life of this patent
Estimating the term…
Abstract
A system for and method of deriving a position estimate of a receiver from a plurality of parameter measurements is provided. Each measurement is derived from a correlation function, which in turn is derived by correlating a signal received at the receiver with an identification code uniquely identifying a transmitter visible to the receiver. A plurality of position estimates are derived, each from a different subset of the plurality of measurements. Based on local topography, one of the position estimates is selected as the best estimate of the position of the receiver.
Claims21
A method of deriving a position coordinate estimate of a receiver from a plurality of parameter measurements, each of the plurality of parameter measurements concurrently measured at the receiver, each of the plurality of parameter measurements derived from a correlation function which in turn is derived by correlating a signal received at the receiver with an identification code uniquely identifying a transmitter visible to the receiver, comprising:
- deriving a plurality of different position coordinate estimates of a current position of the receiver based on the plurality of parameter measurements, each of the plurality of parameter measurements related to a distance between the receiver and an associated transmitter, at least two of the plurality of different position coordinate estimates of the current position of the receiver being derived with the same type of position-determination scheme from a different subset of four or more of the plurality of parameter measurements;
- and
- selecting, based on local topography, one of the plurality of different position coordinate estimates.
A method of deriving a position coordinate estimate of a receiver from a plurality of parameter measurements, each of the plurality of parameter measurements concurrently measured at the receiver, each of the plurality of parameter measurements derived from a correlation function which in turn is derived by correlating a signal received at the receiver with an identification code uniquely identifying a transmitter visible to the receiver, comprising:
- a step for deriving a plurality of different position coordinate estimates of a current position of the receiver based on the plurality of parameter measurements, each of the plurality of parameter measurements related to a distance between the receiver and an associated transmitter, at least two of the plurality of different position coordinate estimates of the current position of the receiver being derived with the same type of position-determination scheme from a different subset of four or more of the plurality of parameter measurements;
- and
- a step for selecting, based on local topography, one of the plurality of different position coordinate estimates.
A system for deriving a position coordinate estimate of a receiver from a plurality of parameter measurements, each of the plurality of parameter measurements concurrently measured at the receiver, each of the plurality of parameter measurements derived from a correlation function which in turn is derived by correlating a signal received at the receiver with an identification code uniquely identifying a transmitter visible to the receiver, comprising:
- first logic for deriving a plurality of different position coordinate estimates of a current position of the receiver based on the plurality of parameter measurements, each of the plurality of parameter measurements related to a distance between the receiver and an associated transmitter, at least two of the plurality of different position coordinate estimates of the current position of the receiver being derived with the same type of position-determination scheme from a different subset of four or more of the plurality of parameter measurements;
- and
- second logic for selecting, based on local topography, one of the plurality of different position coordinate estimates.
A system for deriving a position coordinate estimate of a receiver from a plurality of parameter measurements, each of the plurality of parameter measurements concurrently measured at the receiver, each of the plurality of parameter measurements derived from a correlation function which in turn is derived by correlating a signal received at the receiver with an identification code uniquely identifying a transmitter visible to the receiver, comprising:
- means for deriving a plurality of different position coordinate estimates of a current position of the receiver based on the plurality of parameter measurements, each of the plurality of parameter measurements related to a distance between the receiver and an associated transmitter, at least two of the plurality of different position coordinate estimates of the current position of the receiver being derived with the same type of position-determination scheme from a different subset of four or more of the plurality of parameter measurements;
- and
- means for selecting, based on local topography, one of the plurality of different position coordinate estimates.
A system for deriving a position coordinate estimate of a receiver from a plurality of parameter measurements, each of the plurality of parameter measurements concurrently measured at the receiver, each of the plurality of parameter measurements derived from a correlation function which in turn is derived by correlating a signal received at the receiver with an identification code uniquely identifying a transmitter visible to the receiver, comprising:
- a correlator for correlating a at least one signal received at the receiver with at least one identification code uniquely identifying at least one transmitter visible to the receiver;
- a memory for storing a plurality of different position coordinate estimates;
- and
- a central processing unit for:
- deriving the plurality of different position coordinate estimates of a current position of the receiver based on the plurality of parameter measurements, each of the plurality of parameter measurements related to a distance between the receiver and an associated transmitter, at least two of the plurality of different position coordinate estimates of the current position of the receiver being derived with the same type of position-determination scheme from a different subset of four or more of the plurality of parameter measurements;
- and
- selecting, based on local topography, one of the plurality of different position coordinate estimates.
A non-transient, computer-readable storage medium comprising program code, which, when executed by a processor, causes the processor to derive a position coordinate estimate of a receiver from a plurality of parameter measurements, each of the plurality of parameter measurements concurrently measured at the receiver, each of the plurality of parameter measurements derived from a correlation function which in turn is derived by correlating a signal received at the receiver with an identification code uniquely identifying a transmitter visible to the receiver, the program code, when executed by the processor, causes the processor to:
- derive a plurality of different position coordinate estimates of a current position of the receiver based on the plurality of parameter measurements, each of the plurality of parameter measurements related to a distance between the receiver and an associated transmitter, at least two of the plurality of different position coordinate estimates of the current position of the receiver being derived with the same type of position-determination scheme from a different subset of four or more of the plurality of parameter measurements;
- and
- select, based on local topography, one of the plurality of different position coordinate estimates.
A method of deriving a position coordinate estimate of a receiver from a plurality of parameter measurements, each of the plurality of parameter measurements measured in conjunction with a positioning procedure to estimate a position of the receiver substantially at a given time, each of the plurality of parameter measurements derived from a correlation function which in turn is derived by correlating a signal received at the receiver with an identification code uniquely identifying a transmitter visible to the receiver, comprising:
- deriving a plurality of different position coordinate estimates of a current position of the receiver based on the plurality of parameter measurements, each of the plurality of parameter measurements related to a distance between the receiver and an associated transmitter, at least two of the plurality of different position coordinate estimates of the current position of the receiver being derived with the same type of position-determination scheme from a different subset of four or more of the plurality of parameter measurements;
- and
- selecting, based on local topography, one of the plurality of different position coordinate estimates.
A method of deriving a position coordinate estimate of a receiver from a plurality of parameter measurements, each of the plurality of parameter measurements measured during a positioning procedure that is configured to produce a single position coordinate estimate result for a current position of the receiver, each of the plurality of parameter measurements derived from a correlation function which in turn is derived by correlating a signal received at the receiver with an identification code uniquely identifying a transmitter visible to the receiver, comprising:
- concurrently deriving a plurality of different position coordinate estimates of the current position of the receiver based on the plurality of parameter measurements, each of the plurality of parameter measurements being related to a distance between the receiver and an associated transmitter, at least two of the plurality of different position coordinate estimates of the current position of the receiver being derived with the same type of position-determination scheme from a different subset of four or more of the plurality of parameter measurements;
- and
- selecting, based on local topography, one of the plurality of different position coordinate estimates as the single position coordinate estimate result.
Dependencies are inferred from the claim text.