In light of the shortcoming of existent arithmetic based on the model of Signal Energy used to sensor network track,the author proposes a new arithmetic—the Arithmetic of Iterative Grade and proves it has obvious advantage in accuracy and speed of track through emulation experiment.

For identifying the main oscillation mode,a new method based on signal energy analysis of disturbed trajectory has been proposed.

An energy-error criterion was introduced to avoid the influence of false component in the process of EMD, and by means of the proposed method, the applied scene of signal energy method can be expanded.

This paper introduces the working principle of the inductive level sensor,expounds the system structure and control scheme of the intelligent signal source,and analyzes on the design principle and software design of the signal generater.

The impulse function is an ideal signal models and allied frequency scanning signal,it is also a test signal,this viewpoint is helpful for the readers to understand the intention and meaning of introducing impulse function,also helpful to apprehending the exact physical meaning of impulse response and system function exactly in signal and system analysis.

Spaceborne bistatic SAR geometry and signal model;

In this paper,a signal model of ultrasonic testing for large grained materials is developed.

After describing IR-UWB signal model,some open research issues in this field are discussed in detail.