Error analysis of ionospheric dispersion on dual-frequency altimetry
双频雷达高度计电离层色散效应误差分析

Radar altimeters selects full-deramp technology in pulse compression,and apply two frequencies to reduce the ionospheric range errors.These will,as this paper shows,introduce an effect called "Ionospheric Dispersion",especially in lower frequency,and this can lead to errors in height estimation.No foreign document is available to solve this problem,so this paper attempts to illustrate it.The authors finally draw the conclusion that these errors can be treated similarly as the quadratic phase errors,whose nature and solution are wellestablished,and that the magnitude of this error for a typical altimeter is also discussed.Furthermore,the actual Doppler errors are deduced and it is shown that the existent Doppler algorithms are adequately accurate.Finally,by computer simulation,the sidelobes introduced to the system point target response are illustrated and the errors are estimated.