| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the participation of a participation cooperator without letting the measured value of the participation cooperator known directly, and without invading the location privacy of the participation cooperator by a data aggregator.SOLUTION: In the present invention, a data aggregator device classifies participation cooperators into groups, and transmits, to each participation cooperator terminal, the number of a group to which the participation cooperator belongs, a position X, a range in which the X and the participation cooperator can exist, information about the number of dimensions, and information pertaining to the number of participation cooperators. The data aggregator device also sends out a sensing request signal, and each participation cooperator terminal receives the sensing request signal, measures the position of the participation cooperator terminal, obtains the result of measurement, calculates the weighting coefficient of the X and the measured position, generates a random number r of average 0, and transmits a calculation result s to the data aggregator device along with the group number to which the terminal belongs. The data aggregator device finds the sum of the calculation result s obtained for each group, obtains an estimated value for each group, and calculates the arithmetic average of the estimated value for each group as the final estimated value of an environment f(X). |
