The analysis of dispersive distortions on linear polarization radar signal

The dispersive distortions of broadband signals propagating through the Earth´s ionosphere are investigated in relation to their influence on the range resolution of radar with frequencies from 100MHz to 30GHz. The effect of ionospheric phase and polarization dispersion on linear polarization radar signal is studied neglecting the dispersion due to the irregularity scattering effect. The convolution pulse envelope between the transmitted and the received signal is derived. Then we make analysis and calculation about the pulse duration and range resolution under the different frequency and relative bandwidth. The results show that the dispersion effect turns more serious with the relative bandwidth and less important with the frequency. The polarization dispersion is very weak when the carrier frequency is more than 600MHz. The phase dispersion is notable even to the carrier frequency between 100MHz and 30GHz.