32 results about "Carrier dynamics" patented technology

The invention discloses an SINS/GPS super-compact integrated navigation system and an implementing method thereof. The method comprises the following steps: the doppler frequency assistance is provided for a GPS carrier loop by using the velocity information of a strapdown inertial navigation system, therefore, the loop equivalent bandwidth is increased, the influence of the carrier dynamic stateon the carrier loop is lowered, and the noise suppression capability is improved by reducing the bandwidth of a filter; meanwhile, in order to eliminate the correlation between the pseudo-range rate error and the inertial navigation error, a carrier loop tracking error model is obtained by establishing the relationship between the carrier tracking error and the inertial navigation speed error, andthe influence of the carrier tracking error is subduced in the measurement equation; and in addition, the carrier frequency is adjusted according to the output error estimation information, and the tracking accuracy of the carrier loop is enhanced. The invention can effectively enhance the noise suppression capability and the dynamic tracking performance of the tracking loop and enhance the tracking accuracy of a GPS receiver and the navigation accuracy of the integrated navigation system under strong interference and high dynamic circumstance.

The invention discloses a real-time monitoring method for the dynamic process of roadbed rolling and constructing. The method comprises the following steps. The various road rolling machineries are provided with mobile station equipment with high-precision GPS-RTK system and base station equipment. The base station equipment acquires and transmits the GPS observed data; the mobile stations of the road rolling machineries perform carrier dynamic phase differences to the data received through a 3G networked transmission module from the base station and the acquired GPS observed data and transmit the solved data to a 3D network server. A data converting and filtering subsystem processes, analyzes and stores the data in a database; the display platform of a monitoring center obtains the data in the database through the network and dynamically displays the three-dimensional visualized rolling process information. Therefore, real-time monitoring of the entire construction process can be achieved to ensure that a roadbed is rolled for at least as many times as possible until it is fully compacted. In this way, the phenomena of excessive pressing or lack of pressing can be avoided; human resources are reduced; and the construction time is shortened.

The invention discloses a loop self-regulation method of a satellite navigation receiver. Judgment and steps for optimizing loop parameters are increased on the basis of keeping original tracking loop structures of the receiver, and loop orders and noise bandwidth can be automatically adjusted according to carrier dynamic information. The method does not need to add a complete inertial navigationsystem additionally.

The invention discloses a carrier dynamic attitude estimation method based on an MEMS inertial sensor. The method comprises the following steps: acquiring triaxial accelerometer data and processing the triaxial accelerometer data through an accelerometer noise model; acquiring three-axis gyroscope data and processing the three-axis gyroscope data through a gyroscope noise model; and processing thedata processed by the three-axis gyroscope and the data processed by the three-axis accelerometer by an EKF filter and then performing multi-sensing information fusion to solve an attitude angle andupdate attitude information. Therefore, the accelerometer data is processed through the accelerometer noise model, the gyroscope data are processed through the gyroscope noise model, multi-sensing information fusion is performed on the data processed by the three-axis gyroscope and the data processed by the three-axis accelerometer through the EKF filter and thus the attitude information of the dynamic carrier is stably and accurately obtained.

Dynamic channel allocation (DCA) is adopted in the indention. When new call arrives to system, as long as there is a one vacant channel, mobile control center allocates the channel to the call. After the call is ended, the channel is returned back to central storage area. The invention solves technique issue for quick accessing channel and raises quality of service of mobile communication. Features are: avoiding interference, minimized distance of reusing channel, using wireless resources in high efficiency and increasing system capacity.

The invention discloses a Beidou carrier wave adaptive tracking loop implementation method based on weight adjustment. The Beidou carrier wave adaptive tracking loop implementation method based on weight adjustment includes the following steps: 1) measuring a received signal of a receiver and the phase error of a local copy carrier wave; 2) calculating the dynamic state of carrier, and updating the loop order weight; 3) calculating the carrier-to-noise ratio of a satellite signal; 4) according to the dynamic state of carrier, obtained in the step 2, and according to the carrier-to-noise ratio, obtained in the step 3, solving the optimal band width of the second order and third order loops in the current state through an iteration mode, and updating the optimal band width to the corresponding loop; and 5) updating the carrier NCO controlled variable. The Beidou carrier wave adaptive tracking loop implementation method based on weight adjustment increases a carrier-to-noise ratio detection link, a loop order weight adjusting link, a carrier dynamic state detection link and an adaptive bandwidth adjusting link on the basis of the loops of a traditional receiver, thus improving the dynamic performance and the phase demodulation accuracy of the traditional receiver.

The invention discloses a low-voltage power line carrier dynamic routing method based on firefly-ant colony algorithm. The method comprises the following steps of: step1, initializing parameters of afirefly algorithm; step2, taking each firefly position corresponding to each parameter in the ant colony algorithm; step3, taking a firefly position corresponding to each ant as a parameter thereof; step4, each ant performs an ant colony algorithm to obtain an optimal path; step5, judging the firefly position according to the optimal path of the current solution, adjust the firefly attraction andposition, and return to step 3; step6, when the firefly position converges, the parameter optimal solution of the ant colony algorithm is obtained, and the obtained path is the optimal path from the router to the electric meter J. According to the method, the convergence speed of the ant colony algorithm is fast, and the convergence path is optimal.

The invention provides a high-precision carrier dynamic attitude measurement method and system, and the system comprises two micro-electro-mechanical inertial measurement units, one unit employs a double-position reciprocating transposition mode, and the other unit employs a mode of being fixedly connected with a carrier. Relative attitude, position, speed and the like between the two micro-electro-mechanical inertial measurement units are introduced as new observed quantities, and zero offset of gyroscopes and accelerometers of the two micro-electro-mechanical inertial measurement units is effectively estimated, so that the two sets of systems can be better compensated. The micro-electromechanical inertial measurement unit fixedly connected with the carrier is used as attitude output inertial navigation, so that the phenomenon of peak jump of an attitude calculation result caused by reciprocating rotation of the first micro-electromechanical inertial measurement unit is successfully eliminated, and the precision of the whole system is improved. In the using process, accurate position information does not need to be introduced, so that satellite signals do not need to be introduced, and the system has better anti-interference performance, stability and concealment.

The invention relates to a four-dimensional high-temporal-spatial-resolution ultrafast photon electron multimode detection device, and belongs to the field of laser micro-nano machining and material science application. According to the invention, through a pumping detection technology, focused photons from femtosecond to picosecond are accurately focused to a micro-nano scale sample, and detection is carried out through organic combination of an ultrafast scanning electron microscope and a CCD; a cooling filament is excited by ultrafast laser to form an ultrafast electron beam for observation; the CCD is irradiated by ultrafast laser for observation, so that multimode detection of ultrafast electrons and ultrafast photons can be realized at the same time; detection electrons can be regulated and controlled, so that the detection electrons and photons jointly act on a sample, and multi-mode ultrafast observation of the synergistic effect process of the electrons and the photons is realized; and micro-nano structure processing or modification can be carried out on a sample, and in-situ measurement processing or modified ultrafast carrier dynamics research can be carried out.

The invention discloses a time division multiplexing continuous phase direct carrier modulation and demodulation method. The modulation of the method is based on time division structured continuous phase direct carrier modulation. Data bits are modulated at the first half cycle of a basic carrier; ranging codes are modulated at the second half cycle; two kinds of information time divisions share one carrier cycle; data demodulation and ranging comprise steps of peeling off carriers; tracking and compensating carrier dynamic states, comprising frequency offsets imported by RF carriers before down-conversion; demodulating additional phases; carrying out binary data demodulation; tracking pseudo-random codes through related integration and low-pass filtering, thus realizing compensation of ranging and signal dynamic states. According to the method provided by the invention, the direct carrier continuous phase modulation concept is applied in designing ranging and communication signal waveform sets; secure and reliable navigation and information transmission in a dynamic application environment can be realized; moreover, the frequency spectrum is compressed; the multipath and radio frequency interferences are prevented; and signal tracking and demodulation are easy to be realized.

The invention discloses a long code acquisition method based on Bayesian estimation. A matched filter cascade phase rotation method is adopted, long code signals with certain carrier dynamics are subjected to correlation peak acquisition, acquisition of weak signals is considered at the same time, a verification mode is adopted to effectively eliminate false alarms for a plurality of appearing correlation peaks, and the method is quick in acquisition time, and is applicable to a condition with resource constraints and high acquisition time requirements.

The invention discloses a scintillation material transient process characterization system and method based on laser pumping detection. The system comprises a femtosecond laser, a frequency tripling generator, a delay line, a chopper, a balance detector and a lock-in amplifier, the system is based on the laser pumping detection principle, fundamental frequency light and triple frequency light of a femtosecond laser are used as detection light and pumping light respectively, diagnosis and characterization of the carrier dynamic process in the ps time scale after a scintillation material is excited are achieved through light path design, and the problem of time measurement limit of a conventional photoelectric measurement method is solved.

The invention relates to a method for increasing the time-resolved terahertz spectrum signal-to-noise ratio through a double-phase-locking technique. The method comprises the steps: firstly a time-resolved terahertz spectrum system is set up; secondarily, a delay line needs to be scanned to complete signal input of a detection part; then signals of the detection part are input into two phase-locking amplifiers, and meanwhile signal synchronization between two choppers and the two phase-locking amplifiers is completed; and then signal synchronization of the chopper in a terahertz generation part to the chopper in a pump part is achieved, then the signals where pump optical path background noise is filtered out are input into phase-locking amplifiers in the generation part from the phase-locking amplifiers to subtract signals where background noise of the generation part is filtered out, the signal difference value delta E/E is finally obtained through demodulation of the phase-locking amplifiers in the generation part, and the sample complete carrier dynamic process can be obtained by scanning the delay line. The signal-to-noise ratio of the system can be increased greatly, and themethod can be used for the time-detected terahertz system and is also applicable to small-signal strong-background noise occasions.

The invention relates to an integrated alkali metal carrier dynamic desorption device, comprising a vacuum chamber, an alkali metal carrier support component, an alkali metal collection component, a monitoring component and a heating component, wherein the vacuum chamber comprises a vacuum valve, a heat-zone vacuum chamber, a cold-zone vacuum chamber and a sealing flange, an open end below the heat-zone vacuum chamber stretches into the cold-zone vacuum chamber, the alkali metal collection component comprises a current collector and a condenser, the alkali metal carrier support component comprises a support frame used for supporting an alkali metal carrier, the monitoring component comprises a weighing device placed on the sealing flange, a collection cup placed on the weighing device and a display recorder arranged outside the vacuum chamber, the collection cup is arranged right below a drainage tube, the weighing device is connected with the display recorder, and the heating component is arranged outside the hot-zone vacuum chamber. The invention provides a simulation test means for researching internal relation between flow rate and flow velocity indexes and conditions such as temperature, pressure, time and the like when alkali metal working medium is desorbed from a carrier.

The embodiment of the invention provides a carrier dynamic adjustment method for small cells. The method comprises the following steps: when interference information of a target small cell is greater than a preset interference upper threshold, and load information is lower than a preset load lower threshold, deleting a first carrier in a working carrier set of the target small cell, wherein the first carrier is an overlapping carrier between the target small cell and the adjacent cells; when the interference information of the target small cell is greater than the preset interference upper threshold, and the load information is greater than a preset load working threshold, deleting a second carrier in a working carrier set of each adjacent cell of the target small cell, wherein the second carrier is an overlapping carrier between each adjacent cell and the target small cell; and when the load information of the target small cell is greater than a preset load upper threshold, adding carriers for the working carrier set of the target small cell. The carrier dynamic adjustment method for the small cells provided by the embodiment of the invention dynamically adjusts the carrier resource allocation of the small cells according to the load information and the interference information of the adjacent small cells, so that the carriers between the small cells are staggered as much as possible, so as to reduce the interference between the small cells.