A Credit Region Determination Method for Scattering Coefficient Measurement

The scattering coefficient is an important index to denote the electromagnetic scattering ability of a region. In outdoor test scenarios, the detection range, the antenna gain, and the scattering coefficient difference at each region element cause measurement errors. However, the traditional test strategies do not take into account these factors and the method to reduce the influence of these factors on scattering coefficient measurement. This letter first finds the relationships between the measurement errors and the detection range/antenna gain/scattering coefficient of each test region element using Taylor's formula and radar range equation. Then, a credit test region is obtained according to the required error bound and the relationships. Outdoor measurements and theoretical calculations verify the presented method. Results show that the measurement error is small when the test region is located in the credit region; otherwise, measurement errors increase in the case of the test region larger than the credit region.