Delay compensation of stretching signal in OTHR

In stretch processing system of linear FM, the time delay of return is converted into frequency. The frequency and time delay are proportional to the target range. Each intermediate frequency(IF) pulse occupies different time interval indicating the variation in time delay as a function of range. It will result in high sidelobe when proceeding with an uniform weight in the whole time width. This paper describes the delay compensation technology by subband filter group which can reduce the sidelobe level of weighted signal greatly after the synthesis of multiple channels.