158results about How to "High delay accuracy" patented technology

The invention discloses an intelligent detonation control system, which comprises a detonation controller and electronic detonators, wherein the detonation controller is connected with a computer through a USB interface line; control instruments for writing ID numbers of the detonators and writing the delay time, roll call of addressing identification, charge and discharge of the detonator and detonation are transmitted into the detonation controller by a computer through the USB interface line; the detonation controller comprises a detonator singlechip microcomputer, an interface circuit, anID number writing-in port driving circuit, a detonation control drive circuit, a reverse controller, a voltage-stabilized power supply, an ID writing-in interface and a detonation port; and the detonation singlechip microcomputer is respectively connected with the ID number writing-in port drive circuit and the detonation control drive circuit through the interface circuit. According to the invention, because ID numbering is adopted, each detonator has a fixed serial number, which facilitates the safety management and circulation management of the detonators; because the detonators the ID numbers of which are known cannot be detonated, and misuse and fault detonation of the detonators are avoided and controlled.

The invention discloses a signal interference canceller and a signal interference cancelling method. The signal interference canceller converts an electric interference signal into an optical modulation signal and then transmits the signal to an optical delay line for changing the corresponding optical length passed by the optical signal, so as to realize the delaying of the optical signal and finally converts the optical signal to an electric signal, thereby realizing to transfer the phase of a RF electric signal by (2n+1)180 degrees; wherein, n is equal to 0, 1, 2, 3, and the like; finally the interference signal which affects useful signals is filtered by cancelling. The invention can effectively remove useless signals received by a receiving terminal during the process of multi-carrier transmission; moreover, the invention is characterized by high delaying precision and high electromagnetic interference resistance.

The invention discloses a novel blasting construction method. In the method, an electron detonator is used for blasting. The method also comprises the following steps of: designing a detonator arrangement diagram; detonating at least one detonator; analyzing a generated blasting vibration waveform; detonating a special detonator; and eliminating the blasting vibration to the maximum extent by a phase-stagger vibration damping technology. By the technology of the method, the blasting vibration is obviously reduced, full cross section blasting can be performed, circulating drilling footage is increased, blasting residues are well crushed and an obvious polished surface effect is achieved.

The invention discloses a radio altitude signal simulator assembly based on surface acoustic wave delay lines, relating to an avionic device detection instrument, in particular to a signal simulator assembly of a radio altimeter detector. According to the invention, a plurality of delay lines are arranged and a numerical-control electrically controlled attenuator is additionally arranged; the radio altitude signal simulator assembly also comprises a single-pole multi-throw switch and a single-pole double-throw switch, wherein the single-pole multi-throw switch is used for selecting to switch a radio frequency signal to pass different delay lines; the single-pole double-throw switch is used for selecting to switch a radio frequency signal to pass a delay line path or pass a straight channel path which bypasses a frequency-conversion filtering element and component path; and the single-pole multi-throw switch, the single-pole double-throw switch and the numerical-control electrically controlled attenuator are respectively electrically connected with a micro control unit. According to the radio altitude signal simulator assembly disclosed by the invention, due to adoption of modularized design, the plurality of delay lines which are capable of carrying out different time delays are arranged on one set of assembly, the single-pole multi-throw switch is controlled by the MCU micro control unit to realize selection and switching. Compared with the prior art, the radio altitude signal simulator assembly has the advantages of improving the detection efficiency and realizing the automation because programmed automatic control and switchover can be carried out.

The invention discloses a high-accuracy broadband continuous adjustable real-time time delay line circuit, adopts a method of combining an active coarse adjustment time delay line with a passive fine adjustment time delay line and improves a bandwidth and a time delay range of the time delay line circuit. The active coarse adjustment time delay line comprises an active voltage control time delay unit and a path selection amplifier. The passive fine adjustment time delay line is formed by cascading a plurality of inductor and variable capacitor pairs, by changing a voltage control variable capacitance value, delay time of the fine adjustment time delay line is changed, and the delay time can make up resolution of coarse adjustment time delay, thereby implementing the delay time continuous change of a real-time time delay line. The real-time time delay line carries out time delay accurate control on active time delay units by a time delay calibration loop, so that time delay is not influenced by changes of the outside environment. The circuit has the advantages of high time delay resolution, wide time delay range, high anti-interference capacity, broadband, high integration, low cost and easiness for integration.

Optically controlled microwave beam forming networks comprise 2N single frequency DFB lasers of different wavelengths, , 2N electro-optic intensity modulators, 2N *1 passive wavelength division multiplexers, an optical fiber, 1*2N optical beam splitter, 2N fiber collimator, a time delay network module, 2N coupled lenses, 2N photoelectric detectors and 2N low noise amplifiers, wherein N is an integer larger than 2. The optically controlled microwave beam forming networks have the advantages of the high signal to noise ratio, good dynamic performance, high time delay precision, continuous adjustability, and good stability, and are easy to be extended in the system array size.

This invention relates to a high-frequency clock jitter measuring circuit and calibration method thereof, which comprises a first/second oscillation signal unit to generate the first/second oscillation signal with TV1/TV2 period (TV1 G01R 29/02 G01R 23/02 G01R 31/00 H03K 5/19 6 13 4 2006/4/18 1837835 2006/9/27 100501423 2009/6/17 2009/6/17 2009/6/17 Peking University Shenzhen Graduate School 518057 Zhang Jingkai Li Chongren Yu Fei Tian Chao guo yan 44223

A method of designing a semiconductor integrated circuit includes: performing a circuit simulation of a cell with changing a parameter that specifies a layout pattern around the cell; and generating a delay function expressing a delay value of the cell as a function of the parameter, based on a result of the circuit simulation. The method further includes: generating a layout data indicating a layout of the semiconductor integrated circuit, based on a cell-based design technique. The method further includes: referring to the generated layout data to extract the parameter associated with a target cell included in the semiconductor integrated circuit; and calculating a delay value of the target cell by using the extracted parameter and the delay function.

The invention provides an implementation structure of a fractional delay digital filter. By factorizing odd term and even term of independent variable z in the frequency response function of the fractional delay digital filter, a high-level fractional delay digital filter operation can be factorized into two low-level fractional delay digital filter operations and one complex multiplication operation, thus the variation range of the target fitting curve which takes the delay parameter as the independent variable can be narrowed, the curve fitting orders can be lowered, the number of taps of the filter can be decreased, and hardware resources required for realizing the fractional delay digital filter can be reduced on the premise of not reducing the delay precision.

The invention discloses an LTE (long term evolution) terminal wireless positioning system based on quick time-delay parameter search. In the invention, the positional parameter solution process comprises the following steps: performing frequency domain correlation operation between a received signal and a local signal in a frequency domain correlator (202); judging related peak values in a judging device (203), and sending feedback information to a data adjuster (204); obtaining the maximum peak value through judgment after sliding window transformation, and recording the position in which the peak value is located; reading data in a memory (205), sending the data to a time domain correlator (206) for time domain correlation operation so as to obtain the maximum related peak value, and recording a time delay position; suppressing NLOS influence of the signal by an NLOS (non-line-of-sight) suppressor (207); and finally calculating a target position in a calculator (208). The LTE terminal wireless positioning system is applicable to an LTE communication system, and has good application value in different noise interference environments; and relative to the traditional engineering system, the system has the advantages of fast positioning speed and high positioning precision, thus having wide engineering realization significance.

The invention provides a time delay releasing structure for an inertia safety mechanism. The time delay releasing structure for the inertia safety mechanism comprises an isolation slider, a fixing frame, an electromagnetic pin puller, an inertial slider, a guide shaft, a slider end pin, and a compression spring; the isolation slider is transversely arranged on the base, and the bottom of the isolation slider is provided with a blind hole; the fixing frame is fixed on the base and at the lower position of the isolation slider, a slidable inertial slider is arranged within the fixing frame, the guide shaft is fixed within the inertial slider, and the compression spring is arranged on the guide shaft in a sleeved mode; the slider end pin is fixed on the middle of the top of the inertial slider, and the upper end of the slider end pin is arranged in the inside of the middle section of the isolation slider in a inserted mode; the side of the fixing frame is provided with the electromagnetic pin puller arranged on the base. According to the time delay releasing structure for inertia safety mechanism, the structure design of inertia safety mechanism is simplified, the delay time of the inertia safety mechanism can be decided at will, the delay precision of the inertia safety mechanism is improved, the anti vibration ability and reliability of the inertia safety mechanism are improved, the adaptive capacity to environment of the inertia safety mechanism is increased, and the time delay releasing structure is beneficial for the miniaturization development of the inertia safety mechanism.

The invention discloses a delay detonation control circuit. The delay detonation control circuit comprises a charging circuit, a discharging circuit, a protection circuit and a function circuit. The charging circuit comprises an energy storage element used for carrying out energy storage after current signals are received. The discharging circuit comprises a first switch circuit used for being connected with an electric detonator, and when the first switch circuit is conducted, energy stored in the energy storage element is released to the electric detonator through the first switch circuit, and the remote detonation control over a short electric detonator is achieved. The function circuit comprises a programmable device through which the delay conduction time of the first switch circuit can be flexibly set, and the delay precision is high. In addition, the protection circuit further comprises a second switch circuit. When the first switch circuit is in a stop state, the second switch circuit is conducted, the energy stored in the energy storage element is released through the second switch circuit, and the electric detonator is effectively prevented from being mistakenly triggered when the first switch circuit is in the stop state.

The invention discloses a gallium arsenide monolithic integrated numerical-control real time delay circuit which consists of different basic delay potentials and is characterized in that more than two different basic delay potentials are integrated on the same chip by adopting the integrated circuit technology and the basic delay potentials are connected in series, wherein, each basic delay potential comprises single-pole double-throw switch modules, a delay module and an amplitude adjustment module; the common terminal of one single-pole double-throw switch module is connected with the input signals, and the other two terminals thereof are connected with the input terminals of the delay module and the amplitude adjustment module respectively; and the common terminal of the other single-pole double-throw switch module is the signal output terminal, and the output terminals of the delay module and the amplitude adjustment module are connected with the other two ends thereof. The invention can improve the delay precision, so that better consistency of electrical properties is ensured and the invention is least controlled and affected by the technology; meanwhile, the invention increases the signal amplitude adjustment circuit, compensates for the amplitude fluctuation of the delay branch, fulfils the functions of a plurality of circuits in the transceiver system and reduces the complexity of the system.

The invention discloses a regional NWP (Numerical Weather Prediction) tropospheric delay correction method based on a GRNN (General Regression Neural Network) model. According to the method, firstly,ZTD (Zenith Tropospheric Delay) in one continuous year of all selected continuous operational reference stations in an operation region and reanalysis data provided by NWP in the region in the continuous year are acquired, and an integral method is utilized to invert the ZTD of the continuous operational reference stations in the region; secondly, parts of the stations are selected to serve as training stations, the remaining stations serve as test stations, a GRNN is utilized to fit residual errors of the ZTD inverted according to NWP data of the training stations, and a GRNN residual error fitting model is obtained; and thirdly, error compensation is performed on the ZTD inverted according to the NWP data of the test stations through the GRNN residual error fitting model, and then precise NWP_ZTD of the test stations is obtained. Through the method, error compensation is performed on the NWP_ZTD by fitting the residual errors of the NWP_ZTD through the GRNN model according to the change law of the residual errors of the NWP_ZTD along with multiple meteorological factors for the first time, and NWP inverted tropospheric delay precision is improved.

The invention relates to a manufacturing method of a micro lead delay detonating detonator, belonging to the field of production of civil blasting devices. The manufacturing method of the micro lead delay detonating detonator comprises the following steps of: (1) charging delay powder into an aluminum metal pipe; (2) drawing the aluminum metal pipe charged with the delay powder into a slim metal pipe with the diameter of 1.4-2.6 mm; (3) carrying out plastic coating on the slim metal pipe to form a delay body, wherein plastic coating thickness is 1.5-2.5 mm; (4) cutting the delay body into delay elements with the lengths of 8-200 mm; and (5) assembling to manufacture the micro lead delay detonating detonator. According to the invention, the heavy metal lead is prevented from polluting the environment, the delay accuracy of the micro lead delay detonating detonator is enhanced and the cost of the micro lead delay detonating detonator is reduced; in addition, the micro lead delay detonating detonator can be produced by adopting an integral type structure and also adopting a split type outer delay structure, and delay time is not influenced by the body length of a fire detonator, therefore the requirements on special users can be met by greatly prolonging the delay time.

The invention relates to a method for obtaining optical path difference of an optical switch and a device. The proposal thereof is as follows: firstly an input electric signal provided by a vector network analysis module is modulated on an optical carrier by electric light to obtain an optical signal; then the optical signal is switched to an access by the optical switch, and a path of optical fiber transmission signal is obtained by combined light; the optical fiber transmission signal are demodulated by photoelectricity and then the group delay of the two accesses in the optical switch is obtained by vector network analysis; and finally the group delay of the two accesses is switched to obtain the optical path difference of the two accesses in the optical switch. The invention realizes the measurement of little optical path difference in the optical switch, thus improving the delay precision of an implementation system of the optical switch of the OTTD technology.

The invention discloses a solar light-emitting diode (LED) voice-controlled corridor lighting system which comprises an LED lamp, a voice-controlled unit, a delay control unit, a singlechip and a power supply unit, wherein the LED lamp is used for lighting in a corridor; the voice-controlled unit is used for turning on the LED lamp and comprises a voice acquisition device and a tone discrimination device; the delay control unit is used for delaying after the LED lamp is turned on by the voice-controlled unit; the singlechip is electrically connected with the voice-controlled unit and the delay control unit respectively; the power supply unit is used for supplying power to the LED lamp, the voice-controlled unit, the delay control unit and the singlechip and comprises a solar cell panel, a charging circuit, a storage battery and a conversion circuit which are sequentially connected; the tone discrimination device is provided with a tone feature library of pre-extracted voices of corridor users; the voice acquisition device is used for sending the acquired voice to the singlechip for tone feature extraction; and the singlechip is used for comparing the extracted tone feature with the tone feature of the tone feature library and sending discrimination information to the LED lamp through the delay control unit. The solar LED voice-controlled corridor lighting system has the advantages of safety for the corridor users, energy saving and environmental friendliness.

The invention provides an electric firing explosive head ignition pressure test method. Under a vacuum condition, a flying sheet in contact with an electric firing explosive head is designed; a moving track of the flying sheet in a test tube in an electric firing explosive head ignition process is shot by a high-speed camera, and is simplified into a physical model; a mathematical measure is used for processing relevant data in the flying sheet moving model for solving stress of the flying sheet, i.e., the ignition pressure of the tested electric firing explosive head. The method has the advantages that the ignition pressure of the electric firing explosive head and the dynamic change of the electric firing explosive head can be precisely measured; the problem of difficulty in dynamic measurement of the electric firing explosive head ignition pressure is solved; reliable theoretical basis is provided; the operation is convenient; a measurement result is precise.

The invention provides a method of simulating the real-time calibration of a large time-delay analog source with high precision which is low in consumption and low in cost, and is incapable of influencing the normal operation of the large time-delay analogue source, so as to improve a method of improving the time delay precision as an objective. The method comprises the steps of adding data marks to idle bits in several bytes at the head part or the tail part of a database, and installing a special mark register to memorize a packet header mark, and marking delayed data; meanwhile, installing a counter which is synchronous with the frequency of a write block stored at the state; generating a reset pulse to the counter when the time delay set is updated, updating and marking a value of a shifting register and judging whether the value is equal to a value of a mark register, adding 1 to the value of the counter if the value of the shifting register is not equal to the mark register, and completing the time delay online measurement if the value of the counter is equal to the mark register; compensating a time delay error generated by fine time delay by virtue of changing a thick time delay memory terminating address at the coarse time delay state, and completing the real-time delay verification by changing the termination memory address.

A digital DLL device is provided which can reduce an error with respect to a target delay amount. The device provides a delay to an input clock signal so as to equally divide a clock cycle T thereof into N parts, and includes first variable delay sections and second variable delay sections, each of which is formed of an arbitrary number of unit delay buffers connected in series with one another. A phase comparison section makes a compare between the phase of the input clock signal and the phase of an output signal which is the input signal having been delayed while passing through all the first and second variable delay sections, and outputs a result of the comparison. A delay control section calculates a total number of unit delay buffers S required based on the phase comparison result, sets a quotient Q of S divided by N to be the number of unit delay buffers for each of the first variable delay sections, and allocates a remainder R of S divided by N to the second variable delay sections, respectively.