The height of evaporation duct is an important parameter to represent the duct intensity.The sensitivity of evaporation duct detection system based on Paulus-Jeskes (PJ) model is analysed to the air-sea temperature difference (ASTD) and relative humity and wind speed and sensor errors.Based on the test results,the sensitivity factors affecting the height of the evaporation duct were analyzed.Considering the sensor errors all,the relative diagnostic error of the evaporation duct height are 14.3%、4.22%、8.05% respectively in the stable condition and unstable condition and neutral condition.The parabolic equation of electromagnetic wave propagation in the evaporation duct is solved,and the maximum detection distance in the evaporating duct environment is calculated by radar theory.

The digital video broadcasting-satellite (DVB-S) signal over China is selected as the research object. The performance of passive radar is analyzed from the perspective of signal generation mode, spectral characteristics, delay dimension and Doppler dimension of self-fuzzy function, and system link budget. Theoretical analysis and experimental results demonstrate that the passive radar based on DVB-S signal has good target detection capability.