The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper addresses the code reading error probability (EP) in radio-frequency identification (RFID) SAW tags with pulse position coding (PPC) and peak-pulse detection. EP is found in a most general form, assuming M groups of codes with N slots each and allowing individual SNRs in each slot. The basic case of zero signal in all off-pulses and equal signals in all on-pulses is investigated in detail...
An investigation of the optimal time step (sampling interval) is provided for the time interval error (TIE) model of a local crystal clock in GPS-based timekeeping. For the sawtooth noise of a receiver, the local clock states are estimated employing an unbiased finite impulse response (FIR) filtering algorithm. We exploit the local crystal clock imbedded to the Stanford Frequency Counter SR620. The...
A stochastic model of a crystal oscillator is discussed at low drive levels, where a crystal resonator exhibits the effect termed "sleeping sickness". In the model, resonator losses are supposed to be nonlinear, R1(Ir) = R10(1 + gammaR/Irn), where Ir is a peak amplitude of the piezoelectric current, gammaR is a drive level dependence (DLD) coefficient, and n is a degree of nonlinearity...
The trade-off is investigated experimentally between the real-time unbiased FIR estimates of the time interval error (TIE) model of a local clock and the sawtooth correction implemented to the measurement set. We exploit the crystal oscillator embedded to the Stanford Frequency Counter SR620 as a local clock and rubidium oscillator attached to SR625 as a reference clock. The SynPaQ III GPS Sensor...
Passive wireless surface acoustic wave (SAW) sensors are used to measure temperature, pressure and torque, identify the railway vehicle at high speed, etc. with a resolution of about 1%. Most frequently, the information bearer in such sensors is a time delay of the SAW estimated at the receiver. The basic principle utilized in such a technique combines advantages of the precise piezoelectric sensors,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.