100 results about "Matched load" patented technology

The invention provides a frequency converter dynamic fault diagnosis method and system based on a multi-brand load test platform. According to the method, multiple real-time operation parameter sets are acquired, the amplitude attenuation threshold and the frequency fluctuation interval of a voltage waveform fragment are dynamically adjusted according to a load mode configuration file, the dynamic voltage reference parameter corresponding to the current load mode is generated, and then the actual waveform and an expected current phase curve are compared frame by frame; the method comprises the following steps: firstly, calculating to obtain a phase offset, then constructing a multi-dimensional operation characteristic spectrum, then carrying out time sequence cross validation on a sudden change time node of a power factor jump trajectory and an abnormal waveform position in a harmonic distortion incidence matrix, outputting an abnormal mode code, and finally, matching a load adaptation grade constraint condition to generate a diagnosis report; according to the technical scheme provided by the invention, the fault diagnosis precision and the cross-brand system adaptation capability in a complex load scene are remarkably improved, and the problem of misjudgment of a single brand threshold rule in a multi-device scene is effectively solved.

The invention relates to the technical field of particle accelerators, in particular to a transverse feedback system with a switchable excitation direction and a control method thereof, and the system comprises a beam position detector BPM which is used for measuring a beam signal; the RF front end is used for receiving the beam signal sent by the beam position detector BPM and carrying out amplification and filtering processing; the ADC module is used for converting the beam signal into a digital signal; the digital signal processing module is used for carrying out digital signal processing calculation to obtain an excitation signal; the DAC module is used for carrying out digital-to-analog conversion; the power divider is used for adjusting the phase of the excitation signal; the exciter comprises four Kickers with electrodes, a power amplifier, a low-pass filter and a matched load and is used for applying a transverse excitation signal to the beam current, and the problems that in the prior art, a transverse feedback system Kicker occupies a large longitudinal space, the system is complex, and precision and efficiency are low are solved.

The invention discloses a frequency modulation matching microwave plasma generator, which is characterized in that a circulator is connected between a microwave source and a plasma resonant cavity, microwaves are input from a port 1 of the circulator, and are output to the plasma resonant cavity from a port 2, so that the reflected microwaves are output from a port 3. Meanwhile, a matched load and a power meter are connected to a port 3 of the circulator, microwaves output by the port 3 of the circulator are absorbed by the matched load, most returned microwaves are absorbed by the matched load, a small part of the microwaves are reflected back to the port 3, the microwaves input by the port 3 are output at a port 1, the microwave power borne by the microwave source is reduced, and the stability and the service life of the microwave source are improved. The control system adjusts the output frequency of the microwave source according to the measured power, so that the output frequency of the microwave source is improved, and the output impedance of the microwave source is matched with the working impedance of the plasma resonant cavity again, so that the back-and-forth reflection loss of microwaves is avoided; and the impedance matching adjustment speed is greatly improved.

The present invention relates to a leakage current suppression system for an alternating-current power system. The leakage current suppression system comprises: a variable-frequency compensation control module, which regulates the frequency and signal amplitude in a circuit on the basis of an equipotential feature of a consumer loop of a power system, in order to match load characteristics and achieve dynamic signal amplitude fixation; a real-time monitoring module, which is used for monitoring the frequency, current and voltage of the power system; a central processing unit, which processes data from the monitoring module, and executes data analysis to identify frequency and current variations in the case of current leakage or electric shock; and a leakage current suppression module, which is connected to the real-time monitoring module and is configured with a mechanism which is automatically activated when frequency and current abnormalities are detected, and is used for dynamically adjusting a circuit response to suppress a leakage current. The modules are connected in parallel to the consumer loop, perform rapid adaptive tuning compensation for the parallel frequency resonance in a load loop, and dynamically regulate the current phase and amplitude, so that a zero potential difference at a target load end and current suppression for a target load are achieved, and a suppression and shielding effect on circuit leakage is achieved.

The invention relates to an electric leakage suppression system for an alternating-current power system, and the system comprises a variable-frequency compensation control module which adjusts the frequency and signal amplitude in a circuit according to the equipotential characteristics of a power utilization loop of the power system, so as to match the load characteristics and achieve the dynamic fixation of the signal amplitude; the real-time monitoring module is used for monitoring the frequency, current and voltage of the power system; the central processing unit is used for processing data from the monitoring module, executing data analysis and identifying frequency and current changes under the condition of electric leakage or electric shock; and the electric leakage suppression module is connected with the real-time monitoring module, is provided with a mechanism which is automatically activated when frequency and current are detected to be abnormal, and is used for dynamically adjusting circuit response to suppress leakage current. And the modules are connected in parallel to the power utilization loop, perform rapid self-adaptive modified modulation compensation on the parallel frequency resonance of the load loop, and dynamically adjust the current phase and amplitude so as to realize the zero potential difference of the target load end and the current suppression on the target load, and form the suppression and shielding effects on the leakage of the circuit.

The invention discloses an equal-amplitude in-phase waveguide three-way power divider, and belongs to the technical field of microwaves and millimeter waves. The front side wall of the shielding box is provided with a combining port, and the rear side wall of the shielding box is provided with three distribution ports; a branch waveguide three-way power divider, an L-shaped waveguide, a waveguide phase shifter and a waveguide matching load are arranged in the shielding box. Wherein the branch waveguide three-path power divider is a six-port device which is obtained by combining straight paths of two five-branch waveguide directional couplers; the L-shaped waveguide is composed of two sections of standard straight waveguides which are vertically intersected, and the waveguide phase shifter is a two-stage step width-reducing waveguide phase shifter and is shaped like a Chinese character'ji '; a wedge-shaped wave-absorbing material is arranged in the waveguide matching load, and the waveguide matching load can bear 20W continuous wave power. According to the invention, the waveguide phase shifter is added to the straight path of the branch waveguide three-path power divider, so that the phase difference of three paths of output signals can be reduced to be within 0.5 degree; the filter has the advantages of being good in amplitude and phase consistency, small in insertion loss, good in port standing wave and high in isolation degree.

The invention provides a broadband radio frequency noise high-precision measurement system and method, and belongs to the technical field of terahertz detection. The system comprises a matching load module, a radio frequency link, a cold and hot load switching module, a superconducting detector module, an intermediate frequency module, an intelligent driving module, a bias module and a computer, firstly, the equivalent noise temperature of a system is represented for the first time through cold and hot load switching in a low-temperature Dewar; and then, after the radio frequency optical path is introduced, the second characterization of the equivalent noise temperature of the system is realized through cold and hot load switching again. Based on two characterization results, the broadband radio frequency noise temperature of the system can be accurately measured in combination with a noise cascade theory, so that the measurement precision and reliability are improved. The method has the remarkable advantages of high stability, efficient measurement, high precision, expanded application and the like.

This invention discloses a dual-output control and detection circuit, including a control circuit, a first detection sampling circuit, a second detection sampling circuit, and a remote matching load circuit. The control circuit includes a drive control module, a first switch module, and a second switch module. The drive control module controls the operation of the first and second switch modules. The first switch module switches between a first control state and a second control state; the second switch module switches between a third control state and a fourth control state. The drive control module receives signals from the first and second detection sampling circuits and controls the operation of the first and second switch modules. This application uses a three-wire output, which can detect open circuit and short circuit faults when the device is not started, ensuring normal operation of the device. It has advantages such as low cost, simple implementation, high reliability, and reduced engineering costs.

The invention discloses a method and equipment for improving matching of a measured piece in an attenuation measurement system, belongs to the field of radio metering, and comprises the method for improving matching of the measured piece in the attenuation measurement system, and the core of the method is that a precise matching absorption load is added in a front-end transmission system of the measured piece; energy transmission is realized on a waveguide wide side of the precise matching absorption load through a coupling hole; a transmission waveguide is additionally arranged above the coupling hole, and energy is transmitted to a measured piece in the forward direction; and a precise matching absorption load is added in the reverse direction to absorb energy in the reverse direction, so that the measured piece matching improvement equipment in the attenuation measurement system is formed, and finally the measured piece matching of the attenuation measurement system is improved. According to the method and the equipment, the impedance matching of the measured piece is improved by using the precise matching load, the voltage standing-wave ratio of the load level is realized, and the attenuation measurement accuracy is improved. The tested piece matching improvement equipment developed by using the method is directly connected to two ends of the tested piece in an attenuation measurement system, so that the impedance matching of the tested piece is improved.

The invention discloses a wide-range current output intelligent load matching capacitive load experiment system, which comprises a three-phase current monitoring module, a multi-stage capacitor load module, a parameter input module and a calculation control module, and is characterized in that the three-phase current monitoring module, the multi-stage capacitor load module and the parameter input module are electrically connected with the calculation control module; the three-phase current monitoring module comprises an A-phase current display unit, a B-phase current display unit and a C-phase current display unit and is used for collecting and displaying real-time current of corresponding phase lines of a three-phase experimental product in real time, and the problems that an existing capacitive load experimental system is narrow in current output range, poor in adaptability, low in intelligent degree, insufficient in long-period operation stability and the like are solved. Current can be accurately output in a wide range, loads are intelligently matched, multiphase products are compatible, experiment safety and stability can be guaranteed, and efficiency is improved.

The present invention provides a low-temperature waveguide noise source. The noise source comprises: a rectangular waveguide, a matching load, and a temperature control device; the rectangular waveguide comprises an input section, a transition section, and an output section connected in sequence; the matching load is disposed within the input section; the input section is used to be placed in liquid nitrogen to cool the matching load; the thermal conductivity of the transition section is lower than that of the input and output sections; the temperature control device is disposed in the output section; and the temperature control device is used to control the temperature of the output end of the output section to a set temperature. The present invention can control the output end temperature to be constant through the temperature control device; the transition section reduces heat conduction between the input and output ends, reduces the impact of the input end on the output end temperature, and ensures stable output of low-reflection coefficient thermal noise. At the same time, the transition section reduces heat loss at the output end, reducing the power consumption of the temperature control device. In addition, the thermal insulation effect of the transition section can reduce the heat gain at the input end, thereby reducing the volatilization of liquid nitrogen used to cool the input end, saving the amount of liquid nitrogen used.

The invention discloses a millimeter wave branch waveguide directional coupler based on artificial surface plasmon, which belongs to the technical field of millimeter wave devices and specifically comprises an input port, a straight-through port, a coupling port, an isolation port, a multi-branch waveguide and a matched load structure. The matched load structure extends into the slots in the centers of the E surfaces on the two sides of the isolation port; the input port is connected to the straight-through port through a main waveguide with a 90-degree outer side fillet, and the isolation port is connected to the coupling port through an auxiliary waveguide with a 90-degree outer side fillet; the multi-branch waveguide is arranged between the main waveguide and the auxiliary waveguide; the matched load structure comprises a load substrate, and an artificial surface plasmon and a multi-stage gradient sawtooth groove structure which are located on the surface of the load substrate. According to the invention, the matching load structures are arranged at the central slots of the E surfaces at the two sides of the isolation port, the isolation degree of the output port is improved, and the matching load structures are not influenced by the lossy wave-absorbing material and the relatively low working temperature of the thin-film resistor by using the excellent heat-conducting property of aluminum nitride and the high temperature resistance of metallic nickel.

The invention discloses an intelligent control method and device for an electronic transformer and a storage medium, and relates to the technical field of transformer control, and the method comprises the steps: obtaining the power demand information of a plurality of loads at the downstream of the electronic transformer, and obtaining the power demand information of each load based on the power demand information and the electrical characteristics of each load; generating a deterministic load sequence for defining a switching or power change plan of each load in a future time period; the core innovation of the invention lies in breaking through the traditional closed-loop regulation thought, and realizing open-loop feed-forward following control by obtaining a load plan in advance and generating a deterministic control curve. The key of the conversion lies in the accuracy of the deterministic load sequence, and the load demand can be accurately matched only when the load action is a control curve which can be planned and predictable in advance and is generated in advance, so that the output stability can be ensured without real-time feedback adjustment.

The invention discloses a magnetic ring saturation characteristic measurement method and device, and the method comprises the steps: building a measurement circuit which comprises an arbitrary waveform generator, a power amplifier, a measured magnetic ring and a matched load based on the reference data of an impedance analyzer, and setting a voltage sensor, a current sensor and a thermocouple to obtain the voltage, current and temperature data of the measured magnetic ring; impedance and inductance data are obtained through calculation and serve as actual measurement data; comparing the measured data with the reference data, defining the ratio of the inductance data attenuation of the measured magnetic ring to the inductance data measured by the impedance analyzer as the saturation rate of the magnetic ring, and recording the signal type, frequency, amplitude and temperature rise corresponding to the magnetic ring at the moment; by fixing the signal type and the frequency and adjusting the signal amplitude, the saturation characteristic of the measured magnetic ring along with the amplitude change under the signal type and the current frequency is obtained; whether the magnetic ring is saturated or not and the saturation degree can be judged, and whether the magnetic ring is available or not is judged by measuring the temperature rise after the magnetic ring is saturated.

The present application provides a method, device, and electronic device for matching loads and computing resources. The method includes constructing a two-branch neural network structure, wherein the two branches of the two-branch neural network structure are a load branch and a computing resource branch, and the arrangement order of neurons in the output layer of the load branch is the same as the arrangement order of neurons in the output layer of the computing resource branch; matching the load branch and the computing resource branch to match the load branch and the computing resource branch. By constructing a two-branch neural network structure, a QA architecture is constructed to match the load branch and the computing resource branch, thereby improving the matching efficiency, thereby solving the problem of low efficiency in matching loads and computing resources in the prior art.

The invention discloses a step-by-step cooperative control method under the condition of multi-degree-of-freedom switching power amplification load difference. The method is suitable for any switching power amplifier with large load difference and multi-path output. On the basis of a synchronous accurate control method, a distributed cooperative control method is adopted to solve the problem of violent vibration of system operation caused by too large actual load difference, and the method is characterized in that a step-by-step cooperative control algorithm realizes the sequential starting of a large load freedom degree and a small load freedom degree under the condition of too large load difference. Firstly, current control of a large load phase is started, and meanwhile a small load phase is kept in a static state. And the actual current value of the large load phase is monitored in real time, and when the actual current reaches the preset range boundary of the given current, the current control of the small load phase is started. The current of other phase loads is synchronously and accurately controlled, the common bridge arm operates independently, and the switching state is matched with the phase load bridge arm with the maximum absolute value of the current error. The operation change of a load bridge arm depends on the polarity of a current error signal and the current change state of the phase with the maximum current error absolute value, and all load currents are synchronously and accurately controlled according to a set tolerance range.

According to an example aspect of the present invention, there is provided an antenna array arranged to control a radar response of a target, comprising multiple ultra wideband antennas, wherein each of said multiple antennas is coupled to a separate switch, and each switch is arranged to control one of said multiple antennas such that when said one antenna is connected to a load, preferably matched load, said one antenna acts as an absorber, and when said one antenna is electrically shorted, said one antenna acts as a reflector, wherein at least one of said multiple antennas is arranged to be electrically shorted at a first time instant and the at least one of said multiple antennas is arranged to be connected to a load, preferably matched load, at a second time instant, and at least one other of said multiple antennas is arranged to be connected to a load, preferably matched load, at the first time instant and the at least one other of said multiple antennas is arranged to be electrically shorted at the second time instant.

The present disclosure relates to a calibration system for a vector network analyzer (VNA), having a plurality of N ports. The calibration system comprises a distribution unit having a plurality of D≤N ports; and a plurality of D≤N calibration units, respectively comprising a calibration circuit having first, second and third ports and an isolation circuit having first, second and third ports. For the respective calibration unit, the calibration circuit is configured to provide at least three different one-port calibration standards, such as open, short and match; the first port of the calibration circuit is arranged for being connected to a respective port of the VNA, the second port of the calibration circuit is connected to the first port of the isolation circuit, the third port of the calibration circuit is connected to a first matched load; the second port of the isolation circuit is connected to a respective port of the distribution unit, and the third port of the isolation circuit is connected to a second matched load. The distribution unit is configured to connect any one of its ports with all other of its ports.

The application discloses a kind of calibration chip sets for calibrating error factor of chip to be measured, the calibration chip set includes short-circuit calibration chip, open-circuit calibration chip, matching load calibration chip and straight-through calibration chip, any calibration chip in the calibration chip set is identical with the size of the chip to be measured, wherein the test pin of the short-circuit calibration chip is short-circuit connected with the ground metal layer itself;The test pin of the open-circuit calibration chip is open between the ground metal layer itself;The test pin of the matching load calibration chip is connected with the ground metal layer itself through load resistance;Two test pins of the straight-through calibration chip are electrically connected between the two test pins of the straight-through relationship on the straight-through calibration chip.The calibration chip used in the application directly sets the calibration reference surface of the vector network analyzer at the pin of the packaged chip, without additional consideration of the parasitic parameter introduced by the test fixture, improves the test accuracy of the chip, simplifies the calibration step and test data processing process.

The invention discloses a compact multi-path waveguide power combiner based on an E-H surface two-dimensional expansion structure, and belongs to the technical field of basic electrical elements. The power combiner is formed by arranging a plurality of rectangular waveguides in a two-dimensional mode, the rectangular waveguide at the center position is a main path waveguide, and the main path waveguide expands outwards through E-face and H-face branch line electric bridges; all the rectangular waveguides outside the main waveguide are coupling waveguides, and the adjacent coupling waveguides are connected through an E-plane or H-plane branch line bridge. When the power combiner is used as a power combiner, all ports at one side of the main waveguide are input ports; and the main waveguide port at the other side is an output port, and the other ports are isolation ports which are connected with matched loads. Through E-H surface expansion, the rectangular waveguide power combiner realizes synthesis of more paths of power, is compact in structure, has good passband characteristics and reflection characteristics, and is suitable for use of a power synthesis amplification structure and a power distribution structure.

The invention discloses a calibration method suitable for a mechanical linear scanning SAR (Synthetic Aperture Radar) imaging system, which belongs to an image processing technology, and comprises the following steps: enabling a transmission parameter measured by a vector network analyzer to be equivalent to a reflection measurement parameter of a single port, and establishing a mathematical model containing a directivity error, a reflection tracking error and a source matching error; matching load calibration and short-circuit load calibration are respectively carried out by using a free space and a large-size metal flat plate, and equivalent emission parameters of the vector network analyzer are obtained; performing time domain gate gating processing and error term solving according to the equivalent emission parameters; and substituting the solved directivity error, reflection tracking error and source matching error into the mathematical model, and carrying out error calibration. The method can adapt to dynamic working characteristics of mechanical scanning, is simple and convenient to operate, and can accurately peel off system errors.

The present invention provides an electromagnetic wave generating system. The electromagnetic wave generating system includes an electromagnetic generating module, a radiation component, and a matching unit connected in series between the electromagnetic generating module and the radiation component. The electromagnetic generating module is configured to generate an electromagnetic wave signal. The radiation component includes one or more radiation units, which are configured to be electrically connected to the electromagnetic generating module to generate electromagnetic waves of corresponding frequencies according to the electromagnetic wave signal. The matching unit includes a first matching module. The first matching module includes a plurality of fixed-value inductors connected in series between the electromagnetic generating module and the radiation component, and a plurality of parallel branches. Each parallel branch of the first matching module includes a fixed-value capacitor and a switch connected in series. The input ends of the plurality of parallel branches of the first matching module are respectively connected in series between two adjacent inductors and between the end inductor and the radiation component, and the output ends are all configured to be grounded so as to more accurately match the load after receiving an adjustment instruction.

The application discloses a transverse feedback excitation device with high shunt impedance and horizontal light extraction, and belongs to the technical field of particle accelerators. The device comprises a beam position probe (BPM), an RF front end, an ADC module, a digital signal processing module, a DAC module, a power divider, a power amplifier, a low-pass filter, an exciter (Kicker) and a matching load. The exciter Kicker has four electrode strips located on both sides of the beam center line and parallel to each other, two electrode strips on the same side are connected in parallel, the characteristic impedance of a single electrode strip is 100Ω, and the equivalent total characteristic impedance after parallel connection is 50Ω; the four electrode strips are distributed in a quadrangular symmetry in the cross section of the vacuum chamber and avoid the horizontal median plane, so as to form an open light path channel. The application improves the shunt impedance of the exciter, reduces the radio frequency power demand, realizes impedance matching with a standard 50Ω system, and guarantees the horizontal unobstructed extraction of the synchrotron radiation light.

The invention belongs to the technical field of thermoelectric power sensors, and particularly relates to a terahertz thermoelectric power sensing chip, a thermoelectric power sensor and application. The structural form of the chip is a heat insulation layer / absorption layer / isolation layer / thermopile / isolation layer / direct current resistor / heat insulation layer. The terahertz signal power absorbed by the absorption layer causes the temperature change of the absorption layer; the thermopile determines the incident power of the terahertz signal by determining the temperature variation of the absorption layer; generalized efficiency is used as the correction calibration amount of the power transmission standard by the direct-current resistor. The terahertz thermoelectric power sensing chip provided by the invention is applied to a thermoelectric power sensor, and the sensor adopts a high-precision and low-standing-wave ultra-wideband waveguide matching load to absorb high-frequency microwave signal power, so that the problem that the measurement frequency of a power meter is limited is solved; the measurement frequency range of the waveguide type thermoelectric power sensor is expanded to 1.1 THz, and the waveguide type thermoelectric power sensor can be used for measuring terahertz signals.

The invention discloses an online customer service user incoming line queuing distribution method and system. The method comprises the steps of user state capture, hybrid scheduling strategy, incentive mechanism design, scheduling model training and distribution abnormity coping. The invention belongs to the field of intelligent scheduling, and particularly relates to an online customer service user incoming line queuing distribution method and system.According to the scheme, on the basis of user queue jumping weight, customer service matching recommendation degree and service duration buffer adjustment value, fine adjustment is conducted outside a rule framework, and abrupt performance of hard queue jumping is avoided; based on a dynamic matching-load balancing mechanism, fine distribution with high skill matching degree and load balancing is realized; waiting time excitation is designed in a segmented manner, so that an aggressive strategy is prevented from being adopted for extremely shortening overtime waiting; a load balancing punishment is constructed through the load unbalance degree, and efficient utilization of resources is guaranteed; user loss caused by distribution failure is reduced based on stepped abnormal response; and the distribution effect is improved.

The present invention discloses a measurement environment device and a measurement system for the directional pattern of a millimeter-wave radar antenna, and relates to the field of millimeter-wave radar. The measurement environment device includes: an antenna to be measured, a plurality of environment antenna modules, and a plurality of microstrip antennas, wherein one environment antenna module is connected to a corresponding microstrip antenna, and the microstrip antenna serves as a matching load for the environment antenna module; the plurality of environment antenna modules and the plurality of microstrip antennas form a measurement channel, and the microstrip antenna serves as a matching load to absorb the power emitted outward by the antenna to be measured, and converts the absorbed power into cross-polarized radiated power. Thus, the power emitted by the antenna to be measured is absorbed by the microstrip antenna, and the absorbed power is converted into cross-polarized radiated power, which can simulate the measurement environment of the radar antenna, so that the main polarization directional pattern of the radar antenna can be accurately measured; and the microstrip antenna can be integrated with the environment antenna as a matching load, resulting in a compact structure and greatly reducing the complexity of the measurement environment device.

The present invention discloses a single-pulse VICTS phased array antenna, comprising a radiation layer, a parallel plate waveguide layer and a feed network layer arranged from top to bottom. The feed network layer is used to access four identical TE mode wave signals and perform feed processing on the four identical TE mode wave signals to obtain four different TEM mode wave signals, namely a sum beam, an elevation difference beam, an azimuth difference wave velocity and a matching load, which are output to the parallel plate waveguide layer. The parallel plate waveguide layer is used to transmit the four different TEM mode wave signals input therein to the radiation layer, and the radiation layer is used to radiate the four different TEM mode wave signals input therein into free space. The antenna has the advantage of effectively combining the measurement accuracy of the single-pulse technology with the flexibility of the VICTS phased array antenna, being able to simultaneously and quickly and flexibly realize beam scanning in the upper half space of the antenna, while having a relatively fast tracking speed and a relatively high tracking accuracy.

The invention discloses a synthetic aperture radiometer on-orbit antenna stability correction method, which comprises the following steps of: calibrating two parameters of receiver on-orbit gain and equivalent noise temperature through a single standard calibration source by utilizing a receiver on-orbit observation matching load and combining a receiver calibration parameter acquired by a laboratory; receiver calibration parameters are reversely transmitted to an antenna output end face, forward modeling is carried out to an antenna input end face in combination with an observation scene, an antenna loss calculation model is constructed by adopting apparent temperatures of the antenna input end face and the antenna output end face, loss parameters of an antenna are calibrated in an on-orbit mode, and the antenna loss is obtained by adopting three times of cold air calibration. According to the method, the characteristic model that the antenna loss changes along with the physical temperature is constructed, meanwhile, the antenna loss is corrected in real time at any physical temperature of the on-orbit antenna, correction of the stability of the on-orbit antenna is completed, and the stability of an on-orbit data product of the synthetic aperture radiometer is effectively improved.

The invention discloses a packaged data transmission optimization method and system based on an eMMC protocol CMD23 instruction, and relates to the field of embedded storage equipment. The method comprises the following steps of: 1, dynamically calculating an optimal packing block number, and packing and transmitting data according to the optimal packing block number; 2, independently controlling a forced programming bit FP / a reliable writing bit RW, writing key data into a flash memory, and detecting the integrity of transmission data; 3, setting a sequence guarantee buffer area for transmitting data, and regularly writing contents in the sequence guarantee buffer area into an RPMB partition of the eMMC equipment; and step 4, comparing the read transmitted data with the original to-be-transmitted data, and verifying the integrity of data transmission. According to the dynamic block counting algorithm, I / O loads can be matched in real time, on the premise that an eMMC protocol bottom layer is not modified, the bus bandwidth utilization rate is greatly improved, the problem of low efficiency of traditional static packaging is solved, and the data transmission reliability is improved through a double-flag-bit cooperation + SQB power failure protection mechanism.

The present invention discloses an absolute brightness temperature calibration method for a synthetic aperture radiometer system. The traditional two-point calibration method has problems such as large measurement error and poor sensitivity, so its scope of use is limited. In order to address these shortcomings, the present invention proposes a new noise injection method, which combines the measured antenna signal and the calibration signal through a coupler and outputs them as one input signal A of the receiving channel, and uses a matching load signal with a precisely known brightness temperature as another input signal B of the receiving channel. The decision module and the control signal generation module in the acquisition processor control the switching of the front-end switch, so that the brightness temperature values ​​of the two input signals of the receiving channel reach a dynamic balance, thereby accurately measuring the absolute brightness temperature of the measured antenna signal. The present invention has the characteristics of small measurement error and high measurement sensitivity, and can be used in various synthetic aperture radiometer systems to accurately measure the absolute brightness temperature of the antenna input.