63results about "Measurment by measuring phase" patented technology

In recent years, much effort has been placed on improving the performance of timing and jitter measurement devices using Delay Locked Loop (DLL) and Vernier Delay Line (VDL) techniques. However, these approaches require highly matched elements in order to reduce differential non-linearity timing errors. In an attempt to reduce the requirement on element matching, a component-invariant VDL technique is disclosed that enables the measurement device to be synthesized from an RTL description. The present invention is based on a single-stage VDL structure, which is used to mimic the behavior of a complete VDL. Furthermore, as test time is an important consideration during a production test, a method and system is provided that reduces test time at the expense of additional hardware.

The invention discloses a multi-channel laser echo time measurement system based on an FPGA (Field Programmable Gate Array) chip, and relates to the field of photoelectric measurement. The system solves the problems that the existing single-point detector cannot meet requirements of multiple channels, high accuracy, wide measurement range, rapid measurement and the like. The system comprises an array detector used for converting a received laser echo signal into a weak current signal, a plurality of preamplifiers with the same quantity as array detector pixels, a plurality of threshold comparators with the same quantity as the preamplifiers, and the FPGA chip of a plurality of channels with the same quantity as the threshold comparators, wherein the preamplifiers are used for amplifying the weak current signal to a voltage signal; the threshold comparators are used for comparing the voltage signal with reference voltage, and generating a timing stop pulse signal used for marking the laser echo signal; and the FPGA chip is used for measuring a time difference between the received timing stop pulse signal and a timing start pulse signal, and obtaining the pulse flight time. The system realizes high-accuracy, wide-range and high-speed array signal measurement through multi-channel signal processing.

A TDC circuit having a small scale circuit and high resolution is disclosed, which is a time-to-digital converter that detects a phase with respect to a reference clock of a signal to be measured, comprising a first delay line in which a plurality of first delay elements with a first delay amount is connected in series, a second delay line group that is connected to a plurality of connection nodes of the first delay line or an input node in the first stage and in which at least one or more second delay elements with a second delay amount different from the first delay amount are connected in series, a plurality of judgment circuits that judge whether the changing edge of the signal to be measured is advanced or delayed with respect to the changing edges of a delayed clock output from the first delay element and the second delay element, and an operation circuit that calculates a phase with respect to the reference clock of the changing edge of the signal to be measured from the judgment results, wherein a difference between the first delay amount and the second delay amount is smaller than the first delay amount and the second delay amount.

The delay between two signals is determined by obtaining zero crossings from each signal, and using each crossing to trigger the sampling of the other signal. Two samples are taken in response to each zero crossing, and the difference between those two samples is calculated. This difference is summed for each event and both signals to derive a value. The process is repeated for different delays between the first and second signals. The values are examined to determine the delay which corresponds to the greatest coincidence between the signals.

A device for high accurate measurement of time intervals is based on the conversion of the time interval to a sequence of samples of the response of a surface acoustic wave filter excited at the beginning and at the end of the measured interval. In one of its configurations, the time interval measurement device includes the input of the pulse signal, the filter exciter, the surface acoustic wave filter, the amplifier, the sampler, the analog-to-digital converter, the sample registers, the register of sample numbers, the voltage comparator, the control circuits, the sample counter, the computer, the output of the reference clock signal source, and the output of the measured time intervals.

A time-to-digital converting circuit and a pressure sensing device using the same are provided. The circuit includes: a delay time-varying unit generating a reference signal having a fixed delay time, and a sensing signal having a variable delay time in response to an impedance of an externally applied signal; and a delay time calculation and data generation unit calculating a delay time difference between the reference signal and the sensing signal, and generating digital data having a value corresponding to the calculated delay time difference. Accordingly, the digital data are generated using the delay time varied in response to the externally applied signal, so that the size of the time-to-digital circuit is significantly reduced. In addition, an affect due to external noises is minimized.

A rate locked loop (RLL) regulates phase slip between two clock signals to provide precision timing for radar, TDR and laser ranging systems. Two clocks having a small mutual frequency offset exhibit a slowing changing relative phase, or phase slip, that produces a stroboscopic time expansion effect in a ranging system. A phase detector converts clock phase to voltage and the voltage is differentiated to provide a rate-of-change signal to a loop controller that precisely regulates the rate-of-phase change. The RLL controls a VCO to produce a constant, linear phase slip having phase errors below the time equivalent of 1-picosecond.

A time-to-digital converter (TDC) includes a converter which receives a first signal and a second signal, delays the second signal in phases using a plurality of delay elements which are coupled in series, compares the delayed second signal with the first signal, and outputs a phase error of the second signal with respect to the first signal, a phase frequency detector which receives the first signal, and a third signal from one of the nodes in the plurality of delay elements, and outputs a phase difference between the first signal and the third signal, and a frequency detector which outputs a frequency error of the second signal with respect to the first signal as a digital code using an output signal of the phase frequency detector and the second signal.

Sub-sampled signals are compared to determine time delay, calibration of delay elements, and other precise time domain measurements, based on properties of aliased signals produced by the sub-sampling. In one embodiment, flip-flops sub-sample an input signal and a delayed signal. A counter measures time delay between edges in the sub-sampled input and sub-sampled delayed signal. The time delay is determined and averaged over a measurement window, and then scaled to determine an amount of delay of the delayed signal. Means to calibrate a delay element inside a measurement device (e.g., Bit Error Ratio Tester), utilizing sub-sampling techniques to achieve precise measurements very quickly and without the need for factory calibration.

Various apparatuses and methods for synchronizing time stamps are disclosed herein. For example, some embodiments of the present invention provide apparatuses for synchronizing a coarse time stamp with a fine time stamp. Such apparatuses include an event signal input, a clock input, a coarse time stamp generator having an input connected to the clock input, and a fine time stamp generator having a first input connected to the clock input, a second input connected to the event signal input, and a synchronization signal output. The apparatuses also include a synchronizer having a first input connected to the clock input, a second input connected to the event signal input, a third input connected to the synchronization signal output and an output connected to the coarse time stamp generator. The synchronizer is adapted to synchronize the coarse time stamp generator to the fine time stamp generator based at least in part on the synchronization signal output. The apparatuses are adapted to combine a synchronized coarse time stamp from the coarse time stamp generator with a fine time stamp from the fine time stamp generator to form a time stamp indicating when an event signal transitioned on the event signal input.

A time difference measuring device can accurately measure a time difference between two pulse signals generated with a predetermined time difference by measuring the two pulse signals by one measurement. The time difference measuring device measures a time difference between a start signal (M1) and a stop signal (M2). The device has a reference signal generation unit (41) for generating two reference signals (S1, S2) having a π/2 phase difference. According to corresponding amplitude values (A11, A12) and (A21, A22) of the reference signals (S1, S2) at each generation timing of the start signal (M1) and the stop signal (M2), a phase difference detection unit (42) calculates a phase difference Δθ (=θstop−θstart) between the generation timings of the pulse signals (M1, M2). According to the detected phase difference Δθ and the cycle (Ts) of the reference signals (S1; S2), a time difference calculation unit (44) calculates the generation time difference Δt between the pulse signals (m1, M2).

A method for a satellite control system to obtain a star sensor data generation time comprises the following steps: expanding GPS second pulse signals emitted by a satellite and a GPS information flow simulation computer in the ground equipment of the satellite control system by using an expansion box, carrying out static satellite model power-up of a star sensor for obtaining the data generation time, accessing to the central control unit of the control system, and powering up the central control unit; sending GPS second pulses to the star sensor through the central control unit as a synchronous signal; observing the remote measurement to obtain the exposure time and attitude quaternion output by the star sensor; slowly moving the GPS second pulses, and observing that whether the data change or not; recording the present phase of the GPS second pulses if the data change; and recording the change between the GPS second pulses and seven recorded phases if the data do not change. The method allows the star sensor exposure time to be obtained through ground tests.

Systems and methods are described for determining a phase measurement difference between a received modulated signal and a local clock signal. An adjusted local clock phase measurement may be determined by subtracting, from the phase measurement difference, a phase correction that is based on the frequency difference between the modulator signal's carrier frequency and the local clock's frequency. A phase modulation value may be generated by scaling the adjusted local clock phase measurement. The scaling may be based on a ratio of the modulated signal's carrier frequency and the local clock's frequency. The phase correction may be based on (i) a count of periods of the modulated signal occurring between each corrected phase measurement and (ii) a difference between the carrier frequency and the local clock frequency.

A frequency hopping signal time difference estimating method belongs to the signal processing category. With the linear corresponding relationship of the phase difference between the time difference of the frequency of the hopping signals which are received in two different positions and the carrier waves of the frequency hopping signals that are received at two positions, and through measuring the phase difference which is between the frequency hopping carrier waves received at two different positions in a plurality of frequency hopping periods, the time difference between the frequency hopping signals which are received at two different positions is estimated. The method comprises the steps of executing band pass filtering to the frequency hopping signal received at two different positions; Hilbert converting in a frequency hopping period and calculating the phase; confirming the phase difference between the frequency hopping signals in two different positions in one frequency hopping period and the middle value of the phase difference; and in the phase difference middle value sequence in K frequency hopping periods, calculating the least square solution of the linear equation set corresponding to the middle value sequence for confirming the time difference estimation of the frequency hopping signal and the like steps. The method of the invention can rapidly estimate time difference to the frequency hopping signal with high frequency, and is widely applied in the frequency hopping radiating signal source positioning system.

In measuring a certain time lag between generations of two pulse signals, a time lag measuring device prevents errors in measurement results even with an error in two reference signals for measuring the time lag. The device measures a time lag between a start signal M1 and a stop signal M2 and includes a reference signal generating section 41 generating two reference signals S1, S2 having a phase difference π/2, and an amplitude detecting section 42 detects amplitudes A11, A12 and A21, A22 of the reference signals S1, S2 at generation timings for the start signal M1 and the stop signal M2, a phase difference detecting section 43 calculating a phase _ of the reference signals S according to each set of the amplitudes (A11, A12) and (A21, A22), and a correcting section 46 correcting the calculated phase using correction data for error correction in the reference signals S1, S2.