Detection and ranging apparatus and method of designing detection and ranging apparatus
AssigneeFujitsu Limited
InventorKazuo Shirakawa
Life of this patent
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Abstract
A method of designing a detection and ranging apparatus having an M number of transmitting elements and an N number of receiving elements, includes decomposing a desired polynomial equation representing an array factor of a K element sensor array into a first polynomial equation representing an array factor of an M element sensor array and a second polynomial equation representing an array factor of an N element sensor array, determining arrangement of the M number of transmitting elements based on the first polynomial equation, and determining arrangement the N number of receiving elements based on the second polynomial equation, wherein K=M×N, or K≧max(M, N).
Claims16
A method of designing a detection and ranging apparatus having an M number of transmitting elements and an N number of receiving elements, said method implemented on at least one computer, the method comprising:
- decomposing a desired polynomial equation representing an array factor of a K element sensor array into a first polynomial equation representing an array factor of an M element sensor array and a second polynomial equation representing an array factor of an N element sensor array;
- determining arrangement of the M number of transmitting elements based on the first polynomial equation;
- and
- determining arrangement the N number of receiving elements based on the second polynomial equation, wherein K=M×N, or K≧max(M, N).
A computer readable recording medium that records a program for designing a detection and ranging apparatus having an M number of transmitting elements and an N number of receiving elements, the program causing a computer to execute:
- a procedure for decomposing a desired polynomial equation representing an array factor of a K element sensor array into a first polynomial equation representing an array factor of an M element sensor array and a second polynomial equation representing an array factor of an N element sensor array;
- a procedure for determining arrangement of the M number of transmitting elements based on the first polynomial equation;
- and
- determining arrangement of the N number of receiving elements based on the second polynomial equation, wherein K=M×N, or K≧max(M, N).
A detection and ranging apparatus comprising:
- an M number of transmitting elements transmitting a probe signal;
- an N number of receiving elements receiving an echo signal from an object;
- and
- a calculation unit calculating a direction where the object is located using output signals of the N number of receiving elements,
- wherein a distance between a first transmitting element of the M number of transmitting elements and any one receiving element of the N number of receiving elements is βd;
- a distance between a second transmitting element of the M number of transmitting elements and any one receiving element of the N number of receiving elements is βd;
- and
- a distance between other mutually adjacent elements is d or an integral multiple of d, wherein α+β=1.
A detection and ranging apparatus comprising:
- an M number of transmitting elements transmitting a probe signal;
- an N number of receiving elements receiving an echo signal form an object;
- and
- a calculation unit calculating a direction where the object is located using output signals of the N number of receiving elements,
- wherein a distance between a first receiving element of the N number of receiving elements and any one transmitting element of the M number of transmitting elements is βd;
- a distance between a second receiving element of the N number of receiving elements and any one transmitting element of the M number of transmitting elements is βd;
- and
- a distance between other mutually adjacent elements is d or an integral multiple of d, wherein α+β=1.
Dependencies are inferred from the claim text.