This paper introduces the design and realization of the digital sonic tool,it consists of three parts mainly,transmission co-system,receiving co-system,control co-system and data transmission interface circuit surrounding with it.

Design and thinking of forepart circuit for bistatic SAR receiving system;

To accomplish the reception of the electromagnetic field intensity signal effectively,a kind of 24-bit parallel HSMT receiving system that can measure four vectors simultaneously is developed and the system is controlled by low power consumption DSP chip.

According to functions and characteristics of the FY-2C satellite CDAS station receiving system,the designing project of system is suggested and the implementing method is also described in detail.