Recent progress in radar techniques and systems has led to the development of a microwave interferometer, potentially
suitable for non-contact displacement monitoring of civil engineering structures. This paper describes a new
interferometric radar system, named IBIS-S, which is possible to measure the static or dynamic displacement at multiple
points of structures simultaneously with high accuracy. In this paper, the technical characteristics and specification of the
radar system is described. Subsequently, the actual displacement sensitivity of the equipment is illustrated using the
laboratory tests with random motion upon a shake table. Finally the applications of the radar system to the measurement
on a cable-stayed bridge and a prestressed concrete bridge are presented and discussed. Results show that the new system
is an accurate and effective method to measure displacements of multiple targets of structures. It should be noted that the
current system can only measure the vibration of the target position along the sensor's line of sight. Hence, proper
caution should be taken when designing the sensor posture and prior knowledge of the direction of motion is necessary.
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