نتایج جستجو برای: code acquisition
تعداد نتایج: 275843 فیلتر نتایج به سال:
The paper presents a prototype of a biometric system based on human iris code matching. The system consists of the image acquisition, iris features extraction, code determination and the code-matching algorithm. A fast method of coding the iris features, based on Zak’s transform, is introduced. Performance of the system has been verified with the use of a proprietary database of human iris images.
| In order to successfully demodulate a digitally modulated signal, the receiver must rst synchronize its os-cillators and clocks to the received signal. If direct-sequence spread-spectrum modulation is used, then it is also necessary to synchronize to the code sequence that was used to produce the spectral spreading. Methods used to achieve coarse synchronization to the code sequence, also cal...
Global positioning system (GPS) has been demonstrated to be a valid and efficient system for various space applications in low Earth orbit (LEO) and medium Earth orbit (MEO), such as for location determination and time synchronization. However, in highly elliptical and high Earth orbits (HEO), the number of existing space applications is much smaller because of the very weak power of the receiv...
We propose a scheme for rapid acquisition of PN signals for direct-sequence spread spectrum (DS/SS) CDMA systems by estimating the phase of the incoming PN signal with the use of an auxiliary signal. The phase of the incoming P N signal is estimated using the cross-correlation properties between the PN signal and the auxiliary signal. The estimated phase is used to initialize the phase of the l...
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