射頻識(shí)別技術(shù)[Radio Frequency Identification,RFID]是自動(dòng)識(shí)別技術(shù)的一種,近幾年發(fā)展非常迅速。射頻識(shí)別技術(shù)的工作方式是利用射頻方式進(jìn)行非接觸雙向通信,以達(dá)到識(shí)別目標(biāo)對(duì)象并交換數(shù)據(jù)。
Measuring Frequency Content in
Signals
I this section we will study some non parametric methods for spectrum estimation
of a stochastic process. These methods are described in the literature.
All methods are based on the Periodogram which is defined for a sequence x[n]
with length N according to