Patent ID: 11971309
Assignee: JAPAN AEROSPACE EXPLORATION AGENCY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A system comprising:
an antenna having predetermined directivity;
a measurement data processing device that improves spatial resolution of measurement data, received from the antenna, involving two-dimensional coordinate information on a predetermined two-dimensional plane indicating signal intensity of a microwave received by a microwave radiometer from the two-dimensional plane using the antenna, the measurement data processing device comprising:
a plurality of multipliers that multiply together measurement values, which are the signal intensity of the microwave output by the microwave radiometer, and weighting coefficients to be an element of a weighted vector a and output multiplication results, and
an integrator that integrates the multiplication results of the plurality of multipliers, wherein

the weighted vector a has N elements, ai, where i ranges from 1 to N−1,
a sensitivity distribution of the antenna on the two-dimensional plane is represented as a measured antenna sensitivity distribution function G0(x,y) (where, x and y are coordinate information on the two-dimensional plane),
a sensitivity distribution of the antenna having a sensitivity center different from a sensitivity center of the measured antenna sensitivity distribution function G0(x,y) and crossing a sensitivity distribution on the two-dimensional plane of the measured antenna sensitivity distribution function G0(x,y) is represented as a measured antenna sensitivity distribution function Gi(x,y) (where, i=1 or more and N−1 or less, N is a natural number larger than 1),
a sensitivity distribution narrower than the sensitivity distribution on the two-dimensional plane of the measured antenna sensitivity distribution function G0(x,y) and having a sensitivity center equal to the sensitivity center of the measured antenna sensitivity distribution function G0(x,y) is represented as a target antenna sensitivity distribution function F(x,y), and
a sensitivity distribution obtained by multiplying together and integrating the measured antenna sensitivity distribution function Gi(x,y) and the weighted vector is represented as a corrected sensitivity function Φ(x,y),
the weighted vector a is derived by performing arithmetic processing of an inverse problem of the measured antenna sensitivity distribution function G0(x,y) and the measured antenna sensitivity distribution function Gi(x,y), and the corrected sensitivity function Φ(x,y), and
the weighted vector a improves accuracy of the corrected sensitivity function Φ(x,y) with performance of the arithmetic processing of the inverse problem in order to reduce integrated values of a positive value region and a negative value region present on an outer side of the sensitivity distribution of the target antenna sensitivity distribution function F(x,y) in the corrected sensitivity function Φ(x,y).