CN203502749U

CN203502749U - Pulse time interval measuring device

Info

Publication number: CN203502749U
Application number: CN201320583889.1U
Authority: CN
Inventors: 黄民双
Original assignee: Beijing Institute of Petrochemical Technology
Current assignee: Beijing Institute of Petrochemical Technology
Priority date: 2013-09-22
Filing date: 2013-09-22
Publication date: 2014-03-26
Anticipated expiration: 2023-09-22

Abstract

A pulse time interval measuring device comprises a frequency scale signal generator, a pulse transmitter, a pulse receiver, a moment sampler and a signal processor. The moment sampler is connected with the frequency scale signal generator, the pulse transmitter, the pulse receiver and the signal processor. The pulse transmission cycle of the pulse transmitter is set to be a non-integer multiple of the cycle of a frequency scale signal, the pulse cycle serves as a trigger signal of the moment sampler, the moment sampler samples amplitude values of a frequency scale sine wave signal at the pulse transmission moment and pulse receiving moment, the signal processor calculates the phase difference according to the amplitude values of the signal sampled by the moment sampler, and therefore a pulse time interval is obtained. The pulse time interval measuring device is simple in structure, low in cost, convenient and reliable to use, and capable of being used for high-precision pulse time interval measurement of measurement devices for nuclear physics and high-precision laser pulse distance measuring.

Description

Pulse interval measurement mechanism

Technical field

The utility model relates to a kind of pulse interval measurement mechanism, espespecially the pulse interval measurement mechanism of accurately measuring is carried out in PS level pulse time-of-flight interval.

Background technology

Existing high precision pulse time interval measurement method mainly contains Analog interpolation method, digital delay-line interpolation method equal time interpositioning, and its ultimate principle is that the reference clock cycle that pulse counting method is used is subdivided into some deciles.Simulation is after utilizing a constant current source to capacitor charging (or electric discharge), to obtain the magnitude of voltage that is directly proportional with the time interval, by A/D converter, by voltage transitions, is digital quantity, therefore also referred to as time figure, changes.The resolution of this time figure conversion method can be done very highly, but precision is subject to the stability of constant current source, the impact of the factors such as resolution of the linearity of electric capacity and leakage current, ADC chip.Digital delay-line interpolation method is to utilize the transmission of the logic gates in the high speed devices such as COMS, latch or the delay time such as buffer memory carries out temporal interpolation, but this method is subject to device delay time size and dispersed impact.

Obviously, no matter be Analog interpolation method or digital delay-line interpolation method, its time resolution place one's entire reliance upon performance, precision and the dispersiveness of parameters of electronic device, particularly when split-second precision is measured, the influence factors such as the decentralized capacitance of circuit board are difficult to overcome, can be very difficult in circuit design, even cannot realize.

For this reason, developing theory structure high precision pulse flight time interval measurement device simple, that time resolution is PS level is the task of top priority, is also the difficult point of current innovative design.

Summary of the invention

Described in background technology, the purpose of this utility model is to provide a kind of high precision pulse time interval measurement device to PS level, by measured pulse signal, trigger A/D sampling with reference to frequency marking sinusoidal signal, after signal is processed, obtain pulse interval, circuit structure is simple, reliable.

To achieve these goals, the utility model is achieved through the following technical solutions:

A kind of pulse interval measurement mechanism, comprise frequency standard signal generator, impulse sender, pulse receiver, moment sampling thief and signal processor, wherein, described moment sampling thief respectively with described frequency standard signal generator, impulse sender, pulse receiver is connected with signal processor, the impulse ejection cycle of described impulse sender is set to the non-integral multiple of frequency standard signal cycle, using the trigger pip of this recurrence interval as moment sampling thief, described moment sampling thief is in the amplitude of impulse ejection and the frequency marking sine wave signal of sampling respectively the time of reception, described signal processor calculates phase differential according to the above-mentioned signal amplitude data of moment sampling thief sampling, thereby obtain pulse interval.

Wherein, described marker oscillator is comprised of the sine wave signal generator of frequency stabilization, as with reference to reference signal; Described impulse sender transmitting successive pulse groups, its impulse ejection cycle is set to the non-integral multiple of frequency standard signal cycle;

Described impulse sender is comprised of the compensation crystal oscillator TCXO, frequency divider and the pulse shaper that connect successively.

Owing to having adopted technique scheme, the utlity model has following advantage and effect:

1, the utility model reflects the characteristic of measured signal by measuring the amplitude of reference frequency marking sinusoidal signal corresponding to measured signal trigger point, by sampling, with reference to the amplitude data of frequency marking sine wave signal, realize high-acruracy survey, can reach good measuring accuracy, and make subsequent treatment software and hardware simple;

2, the utility model theory structure is simple, and cost is low, and working service is repaired simple and easy, is especially suitable as the high precision time interval measurement in nuclear physics instrument and high-precision laser pulse ranging system.

Accompanying drawing explanation

Fig. 1 is the utility model structure collectivity schematic diagram;

Fig. 2 is the utility model impulse sender the first embodiment basic circuit structure schematic diagram;

Fig. 3 is the first embodiment pulse interval measuring principle waveform schematic diagram.

Embodiment

By Fig. 1, illustrated, a kind of pulse interval measurement mechanism, comprise frequency standard signal generator, impulse sender, pulse receiver, moment sampling thief and signal processor, wherein, described moment sampling thief is connected with described frequency standard signal generator, impulse sender, pulse receiver and signal processor respectively, wherein marker oscillator is comprised of the sine wave signal generator of frequency stabilization, as with reference to reference signal; Impulse sender transmitting successive pulse groups, its impulse ejection cycle is set to the non-integral multiple of frequency standard signal cycle; The pulse signal of impulse sender transmitting identifies accurately impulse ejection constantly through Discr. constantly, and sampling thief is in the impulse ejection sinusoidal wave amplitude of frequency marking of constantly sampling constantly; Equally, pulse signal that pulse receiver receives identifies reception of impulse accurately constantly through Discr. constantly, and sampling thief is in the reception of impulse sinusoidal wave amplitude of frequency marking of constantly sampling constantly; Signal processor calculates phase differential according to the reference sine wave amplitude data of moment sampling thief sampling, finally obtains pulse interval.

By Fig. 2, show the utility model impulse sender embodiment basic circuit structure block diagram: impulse sender is comprised of compensation crystal oscillator TCXO, frequency divider and pulse shaper.

By Fig. 3, show the utility model pulse interval measuring principle waveform, the frequency of compensation crystal oscillator TCXO a little more than (or a little less than) with reference to frequency standard signal frequency, for example arranging with reference to frequency standard signal frequency is 14.85MHz, and the frequency of TCXO is 15 MHz; The impulse ejection cycle is set to TCXO cycle T ₀m doubly, for example, by choosing suitable divider ratio (m=1770), a transponder pulse period m T ₀be equivalent to 1752.3 with reference to the frequency standard signal cycle, consider the periodicity of sinusoidal signal, get phase value [0,1] between, therefore, the phase differential of the reference sinusoidal signal that adjacent two continuous impulse x times are corresponding is a definite value 0.3, be that a rear impulse ejection is constantly than previous impulse ejection Phase delay 0.3 constantly, singularity due to 0.3 this phase value, when several pulses of continuous transmitting, phase value corresponding to each pulse is different, and phase value will travel through the numerical value between [0,1].By said method, sample and carry out after average treatment, can eliminate because of the non-linear phase measurement error causing between sine wave phase and amplitude.

Know again, by said method, can estimate accurate reception of impulse constantly, by signal processor, can obtain pulse interval T:

Figure 2013205838891100002DEST_PATH_IMAGE001

Claims

1. a pulse interval measurement mechanism, it is characterized in that: comprise frequency standard signal generator, impulse sender, pulse receiver, moment sampling thief and signal processor, wherein, described moment sampling thief respectively with described frequency standard signal generator, impulse sender, pulse receiver is connected with signal processor, the impulse ejection cycle of described impulse sender is set to the non-integral multiple of frequency standard signal cycle, using the trigger pip of this recurrence interval as moment sampling thief, described moment sampling thief is in the amplitude of impulse ejection and the frequency marking sine wave signal of sampling respectively the time of reception, described signal processor calculates phase differential according to the above-mentioned signal amplitude data of moment sampling thief sampling, thereby obtain pulse interval.

2. pulse interval measurement mechanism according to claim 1, is characterized in that: described frequency standard signal generator is comprised of the sine wave signal generator of frequency stabilization.

3. pulse interval measurement mechanism according to claim 1, is characterized in that: described impulse sender is comprised of the compensation crystal oscillator TCXO, frequency divider and the pulse shaper that connect successively.