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Measurement of human respiration with microwave Doppler sensor is influenced by the relative position and pose between sensor and human. In this paper, we propose a numerical representation of relation between the measurement and the position and pose. First, we devise a parametric expression of the relative position and pose whose parameters can also be used in microwave signal strength model. Then we prepare a dataset which consists of respiration signal and position and pose of the sensor and the target. The two kinds of data are simultaneously measured with a microwave Doppler sensor and a motion capture. Finally, a model whose inputs are the parameters and output is the measurability of respiration is constructed based on the dataset. Using this model, the influence of the parameters on the measurement is discussed.