32results about How to "Improve tracking sensitivity" patented technology

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 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 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 an interconnected microgrid based on a distributed agent and a scheduling price optimization method, which is characterized in that it includes a power grid, a microgrid, and a microgrid agent; in an island mode, the microgrid agent interconnects and communicates to obtain a local microgrid information, control the load in the micro-grid and adjust the distributed generation; in the grid-connected mode, the micro-grid agent with the leading function monitors the contact power of the grid, and communicates with other micro-grid agents. The present invention also discloses an interconnected microgrid scheduling price optimization method based on a distributed agent, which optimizes the global retail quotation of the interconnected microgrid in the island mode through a privacy protection gossip algorithm; , to estimate and solve the optimal price under global constraints in the grid-connected mode. The invention avoids leakage of user privacy, saves investment in communication networks and communication equipment, has sensitive tracking performance, and is especially suitable for price interaction and consistent scheduling of multi-subject interconnected microgrids.

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 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 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 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 belongs to the field of solar tracking brackets and is suitable for solar photovoltaic inaccurate automatic tracking. The differential pressure solar automatic tracking device of the present invention includes a pressure difference generating device, a transmission mechanism, and a night reset device. The pressure difference generating device is an organic working medium metal sealing tube embedded in a parabolic groove on both sides of the middle partition and the partition. and a metal deformation actuator, and a group of gas tubes are arranged around the reflector as a tracking sensor for the time angle; the present invention aims to propose a differential pressure solar automatic tracking device, which can make the sealed organic medium expand by concentrating light through the change of the solar angle Drive the differential pressure mechanism to rotate to track the sun.

A high-speed tracking method for micro-nano-structure graphic samples, including a computer, an illumination imaging module, a dichroic prism, a focusing mechanism, piezoelectric ceramics, an objective lens, a micro-nano-structure graphic sample to be tracked, a workpiece table, a detector, an image Diffusion module, beam splitter module, beam expander, laser and controller. The micro-nano structure pattern sample to be tracked is placed on the workpiece table, and the surface of the micro-nano structure pattern sample to be tracked is clearly imaged in the illumination imaging module by moving the focusing mechanism up and down. Adjust the beam expander so that the laser emitted by the laser is focused on the surface of the micro-nano structure pattern sample to be tracked, and the workpiece table and the controller are synchronously controlled to complete the movement and tracking of the micro-nano structure pattern sample to be tracked. The high-speed tracking method of the micro-nano structure pattern sample of the present invention can automatically track the micro-nano structure pattern sample at high speed, high precision and high sensitivity, so as to ensure clear imaging of the micro-nano structure pattern and provide guarantee for subsequent reading and detection.

The present invention relates to a frequency estimation device, which includes at least one stage of frequency sweeping unit, and the frequency sweeper includes: a local NCO, first to fourth multipliers, and a first subtractor, connected to the first and third multipliers, and output positive Mixing the result of the positive phase branch of the mixed frequency signal; the first coherent integrator is connected to the first subtractor, and outputs the first coherent integration result according to the mixed result of the positive phase branch of the received forward mixed frequency signal; The first adder is connected to the second and fourth multipliers, and outputs the mixed result of the quadrature branch of the forward mixing signal; the second coherent integrator is connected to the first adder, and receives the forward mixing signal according to Frequency signal quadrature branch mixing result, output the second coherent integration result; the first amplitude calculator, according to the received first coherent integration result and the second coherent integration result, calculate the first MAG value, the first amplitude The value calculator is also connected to the frequency estimator, and the frequency estimator estimates and outputs the frequency of the continuous wave signal according to the first MAG value.

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 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 locationaccording 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 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.

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 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.