Thus in common receiving gathers,firstly calculate the polarization coefficient of direct wave for each trace,and then use the resulted coefficients as weights to determine the main polarization direction in detector coordinates via weighted least square metho.

This paper firstly established emulation mode of the transmission of outer radiant point signal,therefore calculated intensity of direct wave signal and multipath signal,and compared it with practical measure value.

Interference of acoustic direct wave coming from sound source makes accurate determination of underground conditions with acoustic waves difficult.

This paper studies the method of restraining direct-arrival wave of passive radar based on outside radiation source,which adopts the adaptive technique of phased array radar,generates zero falling in the direction of direct-arrive wave to restrain the jamming by adjusting weighted vector.

The factor to affect the performance of the passive radar is as following:direct-path-wave,multi-path effect,co-channel interference,etc.

When FM broadcast transmitter is regarded as extra irradiation source,multipath interference will lead to mismatch between the direct-path-wave reference signal and the echo reflected from target during matching filter,and then it will degrade the performance of moving target detection.

The detecting performance of the external illuminator base bistatistic continuous wave radar system is greatly influenced by the direct signal and the multipath reflected clutter received by the main receiving channel.

How to mitigate position error caused by non-line-of-sight (NLOS) propogation when we use range-based tracking algorithm in Cellular Networks? 2.