33results about How to "Improve tracking sensitivity" patented technology

The invention discloses a global positioning receiver tracking system and a method thereof, wherein the method comprises: estimating the Doppler shift of a target satellite, updating step length by shifting a plurality of frequencies centered on the estimated Doppler shift to acquire a plurality of local carrier wave Doppler, updating a plurality of identical tracking sub-channels, enabling each of the tracking sub-channels to track independently, detecting the signal intensity of each channel and taking the tracking Doppler of the tracking channel with the highest signal intensity as the Doppler shift of the target satellite to estimate, updating each of the tracking sun-channels again based on the result and realizing continual tracking. On the premise of acquiring a more accurate frequency initial estimation, the multi-channel combined tracking method can greatly improve the tracking sensitivity and tracking robustness without the assistance of other information and can acquire better performance by combining with the proven designed various carrier wave tracking loops. Moreover, the system has the advantages of simple structure and easy realization and transplantation.

The invention relates to a GPS / GALILEO navigation base band processing chip and a navigation receiver, belonging to the technical field of receiver of global satellite locating system. The navigation base band processing chip comprises a capturing engine, a tracking passage, a built-in processor and an interface control logic; and the built-in processor consists of a control logic, a built-in processor core, a digital operation module and a double-mouth RAM. The navigation base band processing chip works together with an external master control microprocessor, and calculates the user location according to the satellite trail parameter provided for the master control microprocessor and the information such as pseudo-range measurement; the master control microprocessor interacts with the navigation base band processing chip through a double-mouth RAM (Random Access Memory); a control logic circuit can cut off the clock or voltage of the idle circuit in the navigation base band processing chip so that the power consumption of the navigation base band are greatly reduced; simultaneously, the interface of the navigation base band processing chip and the master control microprocessor has the advantages of flexibility, convenience, strong expandability, and the like.

The invention discloses an interconnected microgrid and a dispatching price optimization method based on a distributed agent, which is characterized in that the method comprises the following steps: apower grid, a microgrid and a microgrid agent; In island mode, the microgrid proxy communicates with each other, obtains local microgrid information, controls load and adjustable distributed generation in the microgrid; In grid-connected mode, the micro-grid agent with leading function monitors the connected power of the grid and communicates with other micro-grid agents. The invention also discloses an interconnected micro-grid dispatching price optimization method based on a distributed agent, which optimizes the global retail bidding of the interconnected micro-grid in an island mode through a privacy protection rumor algorithm. Through consistency algorithm and distributed disturbance primitive-dual sub-gradient algorithm, the optimal price of global constraint in grid-connected modeis estimated and solved. The invention avoids leaking of user privacy, saves investment of communication network and communication equipment, has sensitive tracking performance, and is particularly suitable for price interaction and consistent dispatching of multi-agent interconnected microgrid.

The invention discloses a combined incoherent integral vector tracking method based on a spatial domain, so as to further improve the performance of a vector tracking GPS receiver. In a new vector tracking strategy design, a phase discriminator / frequency discriminator in the traditional vector tracking loop is abandoned, baseband signals of visible satellites of all channels serve as observed quantities after being subjected to incoherent integration, and position, speed, clock bias and the like of the GPS receiver are directly solved by using an EKF for estimating the observed quantities. Due to the existence of incoherent integral operation, the carrier-to-noise ratio of the observed quantities can be effectively increased and the tracking sensitivity can be increased when the GPS satellite signal is weak.

The present invention relates to a method and system for signal parameter correction of BOC signals and a method and system of BOC signal tracking. The method for signal parameter correction of BOC signals comprises the following steps: obtaining captured satellite BOC signals, copying local BOC signals for tracking satellite BOC signals, and obtaining tracking components according to the captured satellite BOC signals; generating pilot frequency pseudo-code signals and data pseudo-code signals corresponding to the local BOC signals, and obtaining pilot frequency tracking components and data tracking components corresponding to the tracking components on the pilot frequency pseudo-code signals and data pseudo-code signals; combining the pilot frequency tracking components and the data tracking components, and obtaining combined tracking components; and correcting the signal parameters of the local BOC signals according to the combined tracking components. According to the invention, the method and system for signal parameter correction of BOC signals and the method and system of BOC signal tracking are able to realize accurate tracking of parameters of BOC signals and provide a good tracking effect.

The present invention belongs to the teaching aid technology field, in particular relates to a tracking dolly used for teaching demonstration. The tracking dolly comprises a bottom plate, and a left motor and a right motor are arranged symmetrically under the bottom plate. The left motor is connected with a left wheel, the right motor is connected with a right wheel, and a universal wheel is arranged under the bottom plate. A battery and a control circuit board are arranged on the bottom plate and are electrically connected, and the left motor and the right motor are connected with the control circuit board separately and electrically. The present invention aims to provide the tracking dolly used for the teaching demonstration, thereby solving the problems that the conventional tracking dolly is complicated in circuit structure, large in energy consumption and low in response efficiency.

The invention discloses a multi-pivot belt automatic deviation-rectifying device. The multi-pivot belt automatic deviation-rectifying device comprises a deviation-rectifying supporting roller bracket equipped with a deviation-rectifying supporting roller, and an induction supporting roller regulating arm equipped with an induction supporting roller, wherein the deviation-rectifying supporting roller bracket and the induction supporting roller regulating arm are horizontally arranged below a transport belt in parallel; a linkage structure is formed between the deviation-rectifying supporting roller bracket and the induction supporting roller regulating arm through a primary pivot, two secondary rotary bearings and two groups of swing rods. In a deviation-rectifying process, acting force is given to the deviation-rectifying supporting roller through the belt, so that the deviation-rectifying supporting roller is driven to rotate, and therefore, the linkage structure is further driven to rotate for driving an induction roller to guide the belt to return to a correct position. Compared with an existing deviation rectifier, the device has the advantage that the structure is greatly simplified; through the linkage mechanism which is formed by two stages of swing rods, the rotation angle of the deviation-rectifying supporting roller is increased, so that deviation-rectifying torque of the deviation-rectifying supporting roller is improved, and deviation-rectifying efficiency is high; besides, while deviating, the belt is firstly in contact with the deviation-rectifying supporting roller, and the deviation-rectifying supporting roller bracket is driven to rotate, so that deviation-rectifying flexibility is high.

The invention relates to a frequency estimation device, comprising at least a primary frequency sweeping unit. A frequency sweeper comprises a local NCO, first to fourth multipliers, a first subtractor connected to the first and third multipliers and used for outputting a positive phase branch frequency mixing result of a forward frequency mixing signal, a first coherent integrator connected to the first subtractor and used for outputting a first coherent integration result according to the received positive phase branch frequency mixing result of the forward frequency mixing signal, a first adder connected to the second and fourth multipliers and used for outputting an orthogonal branch frequency mixing result of a forward frequency mixing signal, a second coherent integrator connected tothe first adder and used for outputting a second coherent integration result according to the received orthogonal branch frequency mixing result of the forward frequency mixing signal, and a first amplitude calculator used for performing calculation to obtain a first MAG value according to the received first coherent integration result and the second coherent integration result, and the first amplitude calculator is further connected to a frequency estimator, and the frequency estimator estimates and outputs the frequency of the continuous wave signal based on the first MAG value.

A collimator for use in a CT system made of an X-ray absorbing material, the collimator comprises an imaging aperture having a first width for passage of a first X-ray beam, the first X-ray beam being used for X-ray imaging, and a tracking aperture having a second width for passage of a second X-ray beam, the second X-ray beam being used for X-ray beam tracking.

The embodiment of the invention provides an EKF-based TC-OFDM receiver code tracking method and a device. The method comprises the following steps of receiving a target signal at the current moment, acquiring a local signal generated by a TC-OFDM receiver itself, subjecting the target signal and the local signal to correlation operations so as to obtain a signal observed value at the current moment, acquiring a state estimation value at the previous moment of the current moment, subjecting the signal observed value at the current moment and the state estimation value at the previous moment of the current moment to calculation based on the EKF algorithm, and obtaining a state estimation value at the current moment. The state estimation value comprises a code phase error and a signal amplitude. The code phase error and the signal amplitude are jointly used the state estimation value of the EKF for calculation. Therefore, the convergence speed and the robustness of a tracking loop are improved. As a result, the tracking sensitivity of the TC-OFDM receiver is improved.

The invention is applicable to the field of navigation field and provides a Beidou satellite navigation receiver, and a method and a device for improving tracking sensitivity of the Beidou satellite navigation receiver. The method comprises the steps of: accumulating an I branch value and a Q branch value in each bit among continuous n bits separately to obtain n groups of bit accumulated values after successful bit synchronization and determination of a first millisecond of a bit period; multiplying the I branch values and the Q branch values in the n groups of bit accumulated values by 2<n> or 2<n-1> kinds of bit compensation values separately, so as to obtain 2<n> or 2<n-1> groups of compensated bit accumulated values; performing m-point FFT operation on the 2<n> or 2<n-1> groups of compensated bit accumulated values separately, so as to obtain 2<n> or 2<n-1> groups of FFT results, wherein each group of FFT results includes m values; finding out the maximum value of each group among the m values of each group of FFT results, so as to obtain 2<n> or 2<n-1> values; and finding out the maximum value of the 2<n> or 2<n-1> values, and confirming the group in which the maximum value exists as a real bit condition. By implementing the Beidou satellite navigation receiver, the method and the device, the maximum length of an integrator-eraser can be increased from 20 or 2 to a multiple of 20 or 2, thereby improving the tracking sensitivity.

The invention discloses a tensioning rectification method and apparatus used for a belt filter press. The method comprises: driving two ends of a tensioning deflection-adjusting roller at the same time through a left rectification mechanism and a right rectification mechanism, and making the tensioning deflection-adjusting roller translate along a conveying direction of a filter screen so as to adjust the tensioning degree of the filter screen. When the filter screen deflects to the left side, the left rectification mechanism drives the left end of the tensioning deflection-adjusting roller for rectification, and when the filter screen deflects to the right side, the right rectification mechanism drives the right end of the tensioning deflection-adjusting roller for rectification. The apparatus includes the tensioning deflection-adjusting roller, the left rectification mechanism, and the right rectification mechanism, wherein the tensioning deflection-adjusting roller is arranged at one end of the filter screen, and the left rectification mechanism and the right rectification mechanism are symmetrically installed at the left and right sides of the filter screen. The left rectification mechanism and the right rectification mechanism are connected to the left and right ends of the tensioning deflection-adjusting roller, respectively, and are externally connected to a gas source mechanism. Through the same mechanism group, tensioning adjustment and rectification of the filter screen can be achieved at the same time, so that the structure of the apparatus is simplified.

The invention belongs to the field of solar tracking supports, and applies to solar photovoltaic inexact automatic tracking. The differential-pressure-type automatic solar tracking device comprises a pressure difference generation device, a transmission mechanical device and a nighttime resetting device, wherein the pressure difference generation device comprises a middle partition board, organic working medium metal sealing tubes embedded in paraboloid grooves in two sides of the partition board and a metal deformation actuator, a set of gas tubes are arranged on the periphery of a reflection mirror to serve as hour-angle tracking sensors. The invention aims to provide the differential-pressure-type automatic solar tracking device which can gather light through solar angle change to enable sealed organic media to expand and drive a differential pressure mechanical mechanism to rotate to track the sun.

The invention discloses an assistant location method and system based on an SUPL platform. The assistant location method comprises the steps that location assistant information is requested by an access point (AP) to a position server according to preset duration of intervals, and the location assistant information sent by the position server is received and stored according to received time; when cold boot initial boot information of a receiver sent by a user side receiver is received by the AP, and location assistant information received at the last time is coded and then transmitted to the user side receiver; location is conducted by the user side receiver according to the obtained location assistant information. According to the technical scheme, a first-time location time conducted by the receiver through cold boot is shortened, and meanwhile the tracking sensitivity of the receiver under a weak signal environment is improved.

The invention discloses a burst signal tracking method suitable for micropower wireless communication variable spreading factor modulation. The burst signal tracking method comprises the following steps of: S1, carrying out carrier stripping on a received burst signal after down-conversion to obtain a quasi-baseband signal; S2, caching the quasi-baseband signal to obtain cached data, and selecting the cached data with the corresponding length according to a spreading factor; S3, carrying out de-spreading processing on the selected cache data; S4, performing segmentation correlation on the data after de-spreading processing, and calculating an integral result; S5, estimating the error of the carrier frequency and the code phase according to the integral result, and filtering the error; and S6, adjusting tracking parameters, and at least using the adjusted tracking parameters for updating tracking parameters adopted when the step S2 and the step S3 are executed. According to the burst signal tracking method and system provided by the invention, different spread spectrum sequences in the wireless burst signal can be de-spread, and meanwhile, a low-power-consumption design is adopted.

The invention discloses a sun tracking device which comprises a thermal-expansion and cold-contraction element, a positioning disk and a pulley. The thermal-expansion and cold-contraction element is of a hollow barrel structure, the surface, facing the sun, of the thermal-expansion and cold-contraction element can extend relative to the surface, back against the sun, of the thermal-expansion and cold-contraction element, and therefore the end face of the thermal-expansion and cold-contraction element tilts. The positioning disk is fixedly arranged on the end face of the thermal-expansion and cold-contraction element, can be tilted along with the tilting of the end face of the thermal-expansion and cold-contraction element, and therefore the lowest point of the positioning disk is made to locate on the surface, back against the sun, of the thermal-expansion and cold-contraction element. The pulley is fixedly connected with a connecting piece and is located on the positioning disk, can move along a circular rail, concentrically arranged with the thermal-expansion and cold-contraction element, on the positioning disk along with the changing of the position of the lowest point of the positioning disk, and therefore the pulley can always stay on the lowest point of the positioning disk. The pulley can drive the connecting piece to rotate to enable external equipment which is fixedly connected with the connecting piece and needs to track the sun to rotate, and the tracking of the sun is achieved. The sun tracking device is high in sensitivity and accuracy, unattended operation can be achieved, and the sun tracking device is small in external environment influence, strong in reliability, small in size, simple in structure, and low in cost.

The invention relates to a GNSS cascade adaptive multi-beam forming method and belongs to the field of satellite navigation. The method comprises two parts of whitening processing and beam forming, the whitening processing completes antenna end interference suppression, the beam forming completes receiver end beam forming, and the whitening processing comprises autocorrelation matrix calculation, autocorrelation matrix square root calculation, square root inversion operation and data conversion processing; the beam weighting comprises weight transformation processing and beam weighting. Compared with a traditional GNSS beam forming method, the scheme can separate anti-interference processing from beam weighting, so the anti-interference processing of an antenna end does not need to be assisted by prior information such as satellite direction and antenna attitude, and a receiver end is easy to achieve space, time and frequency three-dimensional integrated searching and tracking; and meanwhile, the autocorrelation matrix square root inversion algorithm adopted by the scheme is beneficial to improving the odd interference suppression degree of the autocorrelation matrix and improving anti-interference stability of the system.

The invention provides a phase-locked loop tracking method, comprising the steps of: (1) receiving an input signal; (2) mixing the input signal with a local carrier, and after integration-cleaning of the coherent integration time, the kth coherence is obtained Integral result I Pk and Q Pk (3) Calculating the coherent integration results of the I road and the Q road within the k-(N-1) time to the k-1 coherent integration time: and calculating the k-(N-1) time to the k-th time The coherent integration result of the I road and the Q road within the coherent integration time: (4) input the result in the step (3) to the phase detector to obtain the first phase detection result φ e(N‑1)m and the second phase discrimination result φ eNm (5) Calculate the average carrier frequency error f within the kth coherent integration time according to formula a ek (6) obtain the average carrier frequency error f of the k-(N-1) time to the (k-1) time coherent integration time e(k‑(N‑1)) ~ f e(k‑1) , get the compensated carrier phase measurement value according to formula b. (7) The oscillator receives the compensated carrier phase measurement value to update the local carrier oscillation frequency.

The invention discloses an L2C signal tracking method and device, a storage medium and equipment. The method comprises the following steps: receiving an L2C signal, the L2C signal comprising a CM signal and a CL signal; tracking a CM signal; determining a mapping relation between the CM signal and the CL signal; and switching to track the CL signal according to the mapping relation. According to the invention, the technical problems of poor stability and low precision of the method for tracking the L2C signal with the assistance of the L1 frequency band are solved.

The field of satellite navigation receiver design of the present invention specifically discloses an inertial information assisted satellite deep combination loop, which includes an inertial information assisted tracking loop and an inertial information discrimination tracking loop, and the inertial information assisted tracking loop includes an inertial information assisted tracking loop The auxiliary information anomaly discrimination module connected to the output end of the information discrimination tracking loop, the inertial acceleration auxiliary module, the loop optimal bandwidth calculation module, the equivalent carrier-to-noise ratio calculation module, the interference-to-signal ratio estimation module and the loop PIT adjustment module, also include a correlator, and a three-way loop connected to the output of the correlator. Considering the full integration of inertial information and satellite navigation information, the reliable design and optimal parameter design of satellite receivers are realized. The algorithm is simple to apply, without complex or huge calculation formulas. The real-time and calculation can be guaranteed in DSP or Algorithm programming implementation on FPGA hardware platform, that is, easy engineering implementation.

The invention discloses a self-assistant tracking system and a tracking method for a global positioning receiver, wherein the method comprises the following steps: predicating the Doppler shift of a target satellite; revising the predicated Doppler and the change rate of the predicated Doppler shift based on the information of the tracking satellite; and using the revised predicated Doppler shiftto control carrier wave NCO to replace a carrier wave tracking loop and combine code loop to realize the tracking of the target satellite. On the premise of acquiring satellite navigation text in advance, the self-assistant tracking method only needs a satellite in tracking state to revise the Doppler without the assistance of other information and greatly improve tracking sensitivity on the basis of not increasing integral calculation amount. Real data test proves that, the tracking sensitivity of the method can excess -160dBm when tracking the signal with low movement. In addition, the method has the advantages of simple structure, limited required hardware resource and easy realization and transplantation.

The invention is suitable for the field of communication and provides a GPS (Global Position System) receiver, which comprises a signal catcher used for coarsely catching a phase and a frequency of a satellite signal to generate a coarse synchronizing signal, a signal mixing and correlator used or carrying out mixing and relative operation on the satellite signal and outputting the relative result of the signal, a DSP (Digital Signal Processor) used for loading the corresponding algorithm and carrying out phase identification and filtering on the relative result of the signal so as to obtain and return a signal tracking result to the signal mixing and correlator, and a relative result computing unit used for figuring up a navigation bit and a carrier to noise ratio according to the relative result of the signal. According to the invention, the phase identification and filtering functions in a tracking loop of the GPS receiver can be completed by the DSP process, flexibility of the DSP processor on the algorithm selection is fully utilized, the tracking algorithm is dynamically adjusted, and tracking parameters are optimized well.

The invention discloses an asymmetric-incidence-based sample axial position tracking and correcting method and device. The device comprises a laser, a single-mode optical fiber, a collimating lens, a polarizer, a polarization converter, a 0 / Phi phase plate, a space filtering assembly, a 3 / 4 baffle plate, a beam splitter prism, a microscope objective lens, a monitoring light beam focusing lens, a photoelectric induction device, a computer and a three-dimensional nano scanning platform. The method comprises the following steps of: converting a collimating light beam into a second tangential polarized light, wherein polarization directions of each point on the cross section of the second tangential polarized light are symmetric in respect to two symmetric axes which are mutually vertical at the same time, forming asymmetric incident light beams, focusing the asymmetric incident light beams, and projecting the asymmetric incident light beams onto a sample; meanwhile, collecting light beams reflected by the sample as a monitoring light beam, and monitoring axial position shift of the sample and tracking and correcting the axial position of the sample according to center-of-gravity shift of a focusing spot of the monitoring light beam. The asymmetric-incidence-based sample axial position tracking and correcting method and device disclosed by the invention can be applied to sample axial position real-time monitoring and correcting in a high-accuracy super-resolution microscope system.