221results about How to "Resolve inhibition" patented technology

The invention discloses a high-slew-rate error amplifier-based high-accuracy and high-speed low dropout (LDO) regulator circuit, which comprises an over-the-air (OTA) circuit, a second-stage push-pull output circuit, a Miller compensation and dynamic zero compensation circuit, a load current detection circuit, a super source-level follower, a dynamic offset pipe, a feedback network and an output and load circuit. By the LDO circuit, the problems of low gain, low accuracy, low power supply suppression ratio and low response speed of the conventional LDO are solved.

The invention discloses a method for designing a water-spraying boost pump hydraulic model for an efficient and large-power-density ship. The method comprises the following steps that type selection design of water-spraying boost pump hydraulic parameters is conducted, two-dimensional axial face projective geometry is determined, three-dimensional geometrical shapes of an impeller and guide blades are obtained according to a parameterized ternary reversal design method, a three-dimensional geometrical shape of a shrinkage nozzle is obtained through circumferential rotation, the three-dimensional geometrical shapes of the impeller, the guide blades and the shrinkage nozzle are combined to obtain the water-spraying boost pump hydraulic model. The method has the outstanding advantages that the design period is short, the design quality is high, and the water-spraying boost pump hydraulic model which has the advantages of being high in efficiency, compact and large in power density can be rapidly and reliably designed. The geometrical shapes of the impeller and the blades are obtained according to the parameterized ternary reversal design method, so that on the condition that the water-spraying boost pump hydraulic model is kept compact, the efficiency is improved, cavitation is restrained, and the power density is increased in the researching and developing process of a high-speed ship water-spraying boost pump.

The invention belongs to the field of power management and relates to a DC-DC step-down converter, in particular to a synchronous rectification step-down converter chip with a high-precision current detection function. The chip is based on a current PWM-mode DC-DC step-down converter. In the chip, the synchronous rectification switch PWM-mode current control technology is adopted, so the efficiency of the converter is greatly improved, and the output current can reach 2 A. By the adoption of a novel current detection sensing module with extremely high precision, the magnitude of a current can be detected more accurately in time, and the chip can be subjected to reliable overcurrent protection. Besides, according to the design of the chip, a double-frequency oscillator is adopted, so the frequency of a switching tube can be selected automatically according to the load capacity, the efficiency of the chip can be improved, and the working time of the chip can be prolonged. Lastly, the chip integrates a soft start circuit, so a surge current and an overshoot voltage which are generated during start can be suppressed, and an LED lamp and a driving chip can be protected against damage.

The invention provides a T-S fuzzy model-based flexible spacecraft multi-objective integrated control method. According to the method, a T-S fuzzy dynamic model of a flexible spacecraft is established, and the universal approximation of the T-S fuzzy model of the spacecraft is proved; the uncertainty of the inertia of the spacecraft which is caused by relative movement of flexible parts, and various kinds of space disturbance torques are considered; a control-performance LMI description and multi-objective integrated LMI method is adopted; and a robust H-infinity state feedback controller which can make a closed-loop system meet pole constraints and control input constraints is designed based on the T-S fuzzy model of the spacecraft. As indicated by numerical value simulation results, the designed state feedback control system has the advantages of short dynamic adjustment time, fast response, small overshoot and high steady-state accuracy, and can effectively inhibit the vibration of the flexible parts caused by attitude variation, and has high robustness and adaptability for the uncertainty of the model of the spacecraft.

The invention relates to an infrared image enhancement method for electrical equipment based on non-downsampling shear wave transform. The method comprises the following steps: step S100, establishinga mapping relationship between RGB and gray value of an infrared image; Step S200, performing non-downsampling shear wave transform on the infrared image of the electric equipment obtained in the experiment; S300, calculating the maximum inter-class difference of the infrared low-frequency image of the electrical equipment, obtaining a segmentation threshold between the background and the foreground, and segmenting the low-frequency image into two classes of the environmental background and the electrical equipment; S400, enhancing the low-frequency image, linearly enhancing the low-frequencyforeground electrical equipment, and performing histogram equalization and enhancement on the low-frequency background; Step S500, designing an optimized fuzzy membership function, and carrying out fuzzy enhancement on the high-frequency image of the electrical equipment; Step S600, synthesizing the enhanced low-frequency coefficient and high-frequency coefficient according to the NSST inverse transform into a new electrical equipment infrared image. Compared with the prior art, the invention has the advantages of higher image quality, stronger practicability and the like.

The invention provides a time division long term evolution (TD-LTE) broadband digital cluster business application appliance, a system and a method based on an enhanced multimedia broadcast multicast service (eMBMS). The method comprises that a packet data network gateway (PDN-GW) can be used for receiving the cluster business responding and founding cluster loading requests sent by a cluster scheduling management center and the cluster business responding and founding cluster loading requests can be transponded to a gateway, wherein the gateway is used for supporting a cluster business playing specialty. The cluster business responding and founding cluster loading requests are transponded a mobile management entity (MME) by the gateway. After the MME is configured with transmission bearing information, a wireless access bearer establishment can be launched to a base station with the transmission bearing information. After the base station is used for completing the wireless access bearer establishment, cluster business convention can be returned to the cluster scheduling management center to found a response by the MME. The TD-LTE broadband digital cluster business application appliance, the system and the method can be used for regarding a cluster communication as a business to integrate into a public honeycomb mobile system.

The invention provides an implementation method and system of a broadband digital cluster service, a cluster dispatching management center, a BM-SC, an MBMS-GW, an MME, an MCE, a base station, user equipment and a network side device. The implementation method of the broadband digital cluster service comprises the steps that (1) the cluster dispatching management center receives a cluster call establishment request; (2) the cluster dispatching management center sends a created cluster bearing request carrying calling information and a transmission bearing address to a network side according to the cluster call establishment request. Compared with a solution of a private network cluster communication system which is built on the basis of the second generation mobile communication technology, according to the technical scheme, the requirement for the broadband of the cluster service can be effectively met, and transmission efficiency is improved. In addition, the utilization rate of frequency resources can be improved, and application of a cluster communication service is expanded from a traditional private network to a mobile public network.

The invention discloses a large building multi-target micrometric displacement measuring method and belongs to the technical field of building deforming monitoring. P passive corner reflectors are arranged on a tested object, and an array radar is arranged far away from the tested object. The antenna array radiates signals to irradiate all the corner reflectors and receives mixed echo signals, P optimal wave beams are formed, the echo signal of each corner reflector is separated, each wave beam has the maximum gain in the echo signal direction of a corner reflector which needs to be separated, and received signal power is the strongest in that direction; and nulling is formed in the corner reflector echo signal direction of the other P-1 corner reflectors, and interference is lowered to the minimum degree. The phase difference of sending signals and recovered corner reflector echo signals is detected, and phase different changing amount is converted into micrometric displacement amount of each corner reflector. The problem that a plurality of corner reflector echo signals are hard to separate is solved, multi-target micrometric displacement measuring is achieved, anti-jamming capability is high, and the method can be well used in building micrometric displacement measuring.

The invention discloses a microwave photonic band stop filter based on a Microring-Mach Zehnder interference (MR-MZI) structure, which comprises a semiconductor laser, a polarization controller, a phase modulator, an optical band pass filter, an MR-MZI integrated optical filter unit and a photoelectric detector. Narrow bandwidth filter is realized through adjusting the coupling interval between microring resonators in the MR-MZI integrated optical filter unit; through adjusting the bias voltage of each heating electrode in the MR-MZI integrated optical filter unit, the amplitude and the phase of signals are regulated; the amplitude response and the phase response of the microring are used for being combined with the MZI structure in the MR-MZI integrated optical filter unit to generate fully destructive interference, and an ultra high inhibition ratio is realized. According to the microwave photonic band stop filter provided by the invention, on the basis of the narrow bandwidth, the ultra high inhibition ratio is realized, and the microwave photonic band stop filter performance is improved.

The invention discloses a self-adaptive low-light level image intensification method for reducing color cast, relates to low-light level image intensification methods, and aims to solve the problems that the image color cast is intensified when a conventional low-light level image intensification method is used, and a relatively bright area of an image is over-inhibited or over-intensified when being not well processed. The self-adaptive low-light level image intensification method comprises the following steps: firstly, converting a low-light level image into a RGB (Red, Green, Blue) color space, performing inverted S-shaped conversion, performing inversion, calculating minimum values of different pixel points of reversed images at three RGB channels so as to obtain initial dark channel images, and performing median filtering so as to obtain atmosphere light intensity estimation values; converting the inversion images into an HSV color space, and calculating self-adaptive intensification parameters by taking average gray level values of a V channel as average brightness; calculating transmissivity images according to atmosphere imaging equations, modifying so as to obtain transmissivity smooth images, with the atmosphere imaging equations, performing demisting operation on the three RGB channels of the inversion images, performing inversion, and performing S-shaped conversion, thereby obtaining finally intensified images. The self-adaptive low-light level image intensification method is applicable to intensification processing on images.

The invention relates to a method and a device for recovery and purifying elemental sulfur from high-concentration sulfate wastewater. According to the invention, high-concentration sulfate wastewater is subjected to a biological desulfurization treatment; and recovery and purification upon elemental sulfur produced during the biological desulfurization process are realized with an extraction method. The device comprises sequentially connected components of: a wastewater storage tank, a microbial anaerobic reactor, a microbial aerobic reactor, an extraction tower and an extraction regeneration tower. With the method and the device provided by the invention, a problem of the difficulty in treating high-concentration sulfate wastewater can be effectively solved; and sulfur in the wastewater can be recovered with high efficiency. Therefore, a novel idea is provided for solving the problem of industrial sulfur-containing wastewater pollution.

The invention provides a preparation method of urea detection test paper in dairy and a detection method of urea; urease source powder is taken and mixed with pH indicator with the pKHIn more than 6.8; the mixture is diluted by deioned water and the filter solution or the upper suspension liquid after natural deposition is taken, uniformly fixed on a carrier with good water absorption by the forms of coating, printing or soaking, and dried subsequently, thus forming the urea detection test paper; the detection method of the dairy comprises the steps as follows: firstly, common pH test paper is used for detecting the dairy to be detected; whether the dairy to be detected is in normal pH range 6.3-6.8 or not is checked; if so, the urea detection is directly carried out; if not, the pH value is adjusted to the normal pH range and the urea detection is carried out subsequently; one piece of urea detection test paper dips the dairy to be detected and the color change of the test paper is observed; if the color of the test paper is not changed, the dairy is qualified; if the color of the test paper changes, the dairy is mixed with the urea, thus carrying out qualitative judgment on the dairy; and the displayed color is compared with a standard colorimetric card, so as to carry out semi-quantitative detection of the urea in the dairy.

The present invention discloses an improved super-pixel-based image significance detection method. The method comprises the following steps: firstly, segmenting an original image into super-pixels consistent in color and texture based on the simple and linear iterative clustering super pixel segmentation algorithm; secondly, for the image super-pixel segmentation result, calculating the initial saliency map of the original image based on the sparse representation theory; thirdly, for the image super-pixel segmentation result, calculating the center-edge weight map of the original image based on the center-edge idea; fourthly, for the image super-pixel segmentation result, clustering the super-pixels based on the normalized theory so as to obtain a plurality of clustering areas; fifthly, based on the above result, calculating the final saliency map of the original image. According to the technical scheme of the invention, compared with the traditional super-pixel-based image saliency detection method, the problems, including the fuzzy boundary of a saliency object, the inhibited interior of the saliency object and the like, can be solved. The saliency object can be highlighted more uniformly. Meanwhile, the background is effectively suppressed, so that a better detection result is obtained.

The invention relates to a space voltage vector modulation method achieving common mode voltage minimization. Combined with the principle of a traditional space voltage vector modulation method, in each control period, on the basis of choosing two non-zero valid vectors, two reverse non-zero vectors are adopted fixedly for forming a zero vector. The two reverse non-zero vectors are inserted into the head and tail and the middle of the control period symmetrically. Through adjusting the acting sequence of the valid vectors, a switch tube can switch on and off once in each control period. According to the invention, the modulation complexity is not increased and only the minimal change on the basis of the traditional space voltage vector modulation method, NZ-SVPWM can be realized. An advantage of constant frequency of a traditional SVPWM switch is kept and harmonic current is reduced. The algorithm is simple and digitization implementation is easy. At the same time, the common mode voltage is limited within 1 / 6 of DC bus voltage. Therefore, reliable and safe system operation can be ensured when the method is applied to fields of three-phase motor driving, photovoltaic power generation and the like.

The invention discloses a comprehensive treatment method of a high-concentration cyanogens-containing and thiocyanate-containing waste liquid. The method comprises the following steps of: (1) regulating the pH value of a decarbolizing waste liquid to be between 5 and 10; (2) adding the decarbolizing waste liquid and oxydol accounting for 40-50 percent of the total weight of the oxydol to be added into a reactor in the reactor at the same time, raising the temperature to react for 0.5-1h at 150-180 DEG C, continuously adding the remained oxydol accounting for 60-50 percent of the total weight of the oxydol into the reactor between 0.5h and 1.5h to fully react under stirring, wherein the molar ratio of [H202]:[SCN-] added in the reactor is 2.5-4; and (3) cooling materials to the room temperature and discharging. In the method, CN- and SCN- are treated in one operation unit at the same time, and the synergy of two methods of oxydol oxidation and high-temperature hydrolysis is utilized, thereby the usage of Fe salt catalyst is saved, and the reaction temperature in the high-temperature hydrolysis step is lowered at the same time.

The invention relates to a single-chamber and film-free anaerobic type microbial fuel cell for processing acidic mine wastewater, which comprises a cathode and an anode, wherein sludge is used as substrates of an anode region, the acidic mine wastewater containing sulfate reducing bacteria is used as catholyte, a volume ratio of the sludge to the acidic mine wastewater is 1:9; the sludge and the acidic mine wastewater are directly contacted and are layered and divided naturally; an anode region is formed by inserting the anode into the sludge layer, and a cathode region is formed by inserting the cathode into the acidic mine wastewater layer; the anode and the cathode are led out through wires respectively, and a resistance is externally connected, so that an electric circuit is formed. The microbial fuel cell not only can accelerate the increment of the pH value of the acidic mine wastewater, reduce concentration of sulfate ions and heave metal ions, consume excess sludge, but also is low in the cost of the film-free anaerobic structure, and can generate a certain electrical energy.

The invention relates to a signal separation method based on fractional wavelet transform. The signal separation method solves the problem that the traditional wavelet transform method has poor effects on non-stationary signal analysis and treatment. The signal separation method comprises the following steps: determining the order and the layer number of the fractional wavelet transform accordingto parameters of input signals, calculating a transform coefficient of the detailed part of each layer by fractional wavelet transform, calculating signal energy which corresponds to the detailed partof each layer according to the transform coefficient, comparing the signal energy with a set threshold value, retaining the transform coefficient which corresponds to the detailed part of the layer and recording and storing the retained detailed part if the signal energy is larger than the set threshold, and abandoning the transform coefficient which corresponds to the detailed part of the layerif the signal energy is smaller than the set threshold. The signal separation method is applicable to the treatment and analysis occasions of non-stationary signals.

The invention discloses an SHEPWM (selective harmonic elimination pulse width modulation) control circuit, a double-T-type three-level SHEPWM inverter parallel system and method therefor. The double-T-type three-level SHEPWM inverter parallel system comprises two T-type three-level inverters, wherein the direct current sides of the three-level inverters are connected to a same direct current voltage source in parallel; each IGBT of the T-type three-level inverters is driven by the SHEPWM control circuit; and the alternating current sides of the T-type three-level inverters are filtered by a filter and then are connected in parallel to realize a grid connection function.

The invention belongs to the technical field of radar, and discloses a clutter suppression and moving target imaging method for a hypersonic platform. The method comprises the following steps: obtaining the echo signal of each receiving antenna; carrying out pulse compression and azimuth de-chirp compression to get range domain-azimuth compression frequency domain echo signals; coarsely searching for the radial velocity for the first time, and getting a moving target steering vector and a stationary clutter steering vector; calculating an optimal weight vector and suppressing clutter to get moving target echo data; carrying out simplified Radon transform to get the accurate estimated value of radial velocity; and accurately compensating the radial velocity to get a moving target image. The problem that the existing method is inaccurate in clutter suppression and moving target parameter estimation is solved. The clutter suppression performance of hypersonic platform radar is improved. The signal-clutter-noise ratio of a moving target is increased.

The invention discloses a method for preparing a Chinese herbal medicine disinfectant for abating air pollution through an air purifier. The method comprises the steps: mixing all formula raw pharmaceutical materials such as 30g of folium isatidis, 16g of herba leonuri and the like, loading the mixed raw pharmaceutical material to an extracting tank, adding 600L of water into the extracting tank, carrying out heated extraction for 2 hours, obtaining distilled aromatic water from the top of the extracting tank, putting pharmaceutical filtrated residue into the extracting tank, and carrying out second-time extraction so as to obtain a filtrate and distilled aromatic water; and mixing the two kinds of fine medicine liquid, carrying out filtration, and then, concentrating the filtrate to be 600L, thereby obtaining the Chinese herbal medicine disinfectant. According to the Chinese herbal medicine disinfectant, the purification ratio of removing cigarette smoke, PM2.5, formaldehyde and ammonia gas from air reaches 91-99.9%, and the in-air and direct killing rate to influenza viruses, Legionnella, streptococcus pneumoniae and staphylococcus albus reaches 84-99.9%, so that the Chinese herbal medicine disinfectant has outstanding advantages.

The invention discloses a polymer saturated salt water drilling solution suitable for drilling a gas storage warehouse. The polymer saturated salt water drilling solution is prepared from brine glue solution and bentonite slurry with mass percentage concentration of 4% according to a mass ratio of 1:1, wherein the brine glue solution comprises the following components in parts by mass: 100 parts of brine, 0.3-0.35 part of drilling solution coating agent, 1.5-1.7 parts of sulfonated phenolic resin, 1-1.05 parts of high-viscosity sodium carboxymethylcellulose, 1.0-1.10 parts of compound salt resisting filtration loss reducing agent, 1.5-1.6 parts of drilling solution collapse-proof dilute filtration loss reducing agent SN (Sulfanilamide) resin, 1.0-1.05 parts of sulfonated bitumen, 0.3-0.4 part of sodium carbonate, 0.4-0.45 part of caustic soda and solid industrial salt NaCl which is added till the brine glue solution is saturated. Through the polymer saturated salt water drilling solution suitable for drilling the gas storage warehouse, the pollution problem of the upper stratum slurry and the lower calcium mudstone can be well controlled; and the polymer saturated salt water drilling solution is capable of effectively preventing the collapse of the stratum under the casing pipe shoe and has good effects of controlling dissolution of the salt layer and preventing creep deformation of the slat layer.

The invention discloses a natural gas hydrate preventing and controlling agent. The natural gas hydrate preventing and controlling agent comprises glycerol and / or a glycerol solution. The invention also discloses an application method of the natural gas hydrate preventing and controlling agent. The natural gas hydrate preventing and controlling agent can effectively solve the problem about inhibition or prevention and control of the natural gas hydrate when being applied to production as well as storage and transportation of the natural gas, can be used for exploiting the natural gas from the natural gas hydrate system or mineral resources, and also can be used for reducing the dew point of the natural gas and solving the problem that the natural gas flow channel is frozen and blocked; and the advantages and characteristics of easiness in implementation, wide application, easiness in popularization and the like are achieved.

The invention relates to a traditional Chinese medicinal composition used for the cancer recovery stage. According to the traditional Chinese medicinal composition, Radix Astragali, Radix Codonopsis and Millettia dielsiana are used as main materials, traditional Chinese medicines of Chinese angelica, prepared rehmannia root, donkey hide gelatin and the like are added to enrich blood, activate blood circulation, fill essence and supply bone marrow, and many traditional Chinese medicines of Ligustri Lucidi Fructus, Polygonum multiflorum, wolfberry, Rhizoma Atractylodis Macrocephalae, Poria cocos, hyacinth bean, Cornus officinalis, Rhizoma Drynariae, chicken's gizzard membrane, green malt, dried orange peel and the like with functions of kidney tonifying, liver benefiting, spleen invigorating, body fluid generating, lung moistening, dehumidifying and food digesting are added, so efficacies of qi and blood supplying and benefiting, marrow breeding, spleen and stomach harmonizing, and evil eliminating because of qi supporting are reached. The traditional Chinese medicinal composition which selects medicinal and edible natural edible botanical medicines as raw materials contains various amino acids, vitamins and trace elements, and makes nutrients lost due to tumors and chemotherapies be replenished.

The invention discloses an aid for preventing and controlling a natural gas hydrate. The aid comprises a prevention and control agent and / or aqueous solution of the prevention and control agent, wherein the prevention and control agent is any one or a mixture of two or more of urea, disilicate, thiourea, dehydrogenated acetate and lactate according to any proportion. The aid can be used for the production and transportation of natural gas to solve the restraining or prevention and control problem of the natural gas hydrate effectively, and can be used for exploiting the natural gas from a natural gas hydrate system or mineral resources and lowering the dew point of the natural gas and solve the problems of freezing and blocking of a natural gas flow channel. The aid has the advantages of easy implementation, safety, reliability, low cost, easy popularization and the like.

The invention provides a lactoferrin-rich active lactobacillus beverage and a preparation method thereof. The preparation method comprises the following steps of: mixing soyabean protein powder, white granulated sugar and milk to prepare fermenting substrate liquid which comprises 0.3 to 1.5 percent of soyabean protein powder and 3 to 7 percent of white granulated sugar; homogenizing and sterilizing the fermenting substrate liquid; cooling to 36 to 43 DEG C; adding zymophyte and the lactoferrin; culturing the fermenting substrate liquid at the temperature of between 36 and 43 DEG C until the titratable acidity reaches 170 to 200 DEG T; stopping fermenting to obtain a yoghurt basic material; and diluting the yoghurt basic material to prepare the lactoferrin-rich active lactobacillus beverage. The soyabean protein powder and the white granulated sugar are added according to a certain ratio during fermentation, so that the problem that the lactoferrin inhibits the fermentation of lactobacillus, a good fermentation state during the fermentation is guaranteed, and the final product has good quality.

The invention discloses a beneficiation method of high-sulfur lead zinc ores under high-temperature environment. After raw ore pulp with a pH value above 12 is prepared, the lead roughing and the leadscavenging are performed to obtain lead roughing concentrates and lead scavenging tailing pulp; zinc sulfur inhibitors are added in the lead roughing concentrates for lead refining to obtain lead concentrates; the zinc quick flotation, the zinc roughing and the zinc scavenging are performed on the lead scavenging tailing pulp to obtain zinc quick flotation roughing concentrates and zinc roughingcrude concentrates; the zinc roughing crude concentrates are grinded again; then, the zinc sulfur separation roughing and the zinc sulfur separation scavenging are performed; and after the zinc quickflotation roughing concentrates and the zinc sulfur separation flotation roughing concentrates are merged, high-sulfur inhibitors are added for refining zinc sulfur separation zinc to obtain zinc concentrates. The pH value of the pulp is always kept above 13 in each flotation procedure. The beneficiation method can realize efficient recovery of the high-sulfur lead zinc ores under high-temperatureenvironment, and effectively guarantees the beneficiation process technical index of lead and zinc minerals.

The present invention relates to a method of using recombinant Saccharomyces cerevisiae to produce galactooligosaccharides, specifically to a recombinant Saccharomyces cerevisiae with surface display of beta-galactosidase and method for making same and a method of recycling the recombinant Saccharomyces cerevisiae fermentation lactose to produce galactooligosaccharides. The method includes: first of all, building a beta-galactosidase yeast surface display vector, displaying the beta-galactosidase on cell surface of the Saccharomyces cerevisiae, and then recycling the recombinant yeast fermentation lactose to produce galactooligosaccharides. The inventive recombinant Saccharomyces cerevisiae of the surface display beta-galactosidase can be recycled to produce galactooligosaccharides, and has high yields, low production cost, simple process and broad industrialization application prospects.

The invention discloses a method and device for calculating arterial oxygen saturation through addition of dual-wavelength absolute differences. The method comprises the steps of extracting differences between two adjacent sampling points of logarithmic pulse oximeter signals, obtaining an absolute value of the differences, and obtaining a dual-wavelength absolute difference sequence through screening; sequentially extracting a plurality of absolute values of the corresponding positions of dual-wavelengths to obtain a plurality of sets of dual-wavelength absolute difference value sequences, performing normalization on each dual-wavelength absolute difference value sequence, and obtaining a normalized absolute difference value sequence; according to the k sigma criterion, removing normalization absolute values with large errors, and overlaying the values obtained after removal to be used as addition of absolute values of final pulse oximeter signals; building a correction model of truth values of the arterial oxygen saturation and addition of the absolute difference value of pulse oximeter signals; by means of the correction model, the arterial oxygen saturation is calculated. According to the method and device, collected spectroscopic data is more sufficiently utilized, and the dynamic spectrum noninvasive blood component detection precision is remarkably improved.

The invention discloses a frequency modulation continuous wave (FMCW) radar zero intermediate frequency image rejection receiver. A circuit thereof comprises a low-noise amplifier, an I-path mixer, a Q-path mixer, a frequency sensitivity controller, a first low-frequency amplifier, a low-pass filter, a second low-frequency amplifier, a 90-degree power division phase shifter and a 90-degree phase shift synthesizer, wherein the low-noise amplifier is respectively connected with the I-path mixer and the Q-path mixer; the 90-degree power division phase shifter is connected between the I-path mixer and the Q-path mixer; the I-path mixer and the Q-path mixer are respectively connected with the 90-degree phase shift synthesizer; and the frequency sensitivity controller, the first low-frequency amplifier, the low-pass filter and the second low-frequency amplifier are successively connected behind the 90-degree phase shift synthesizer. The receiver has the advantages of simple circuit and low cost, simultaneously inhibits the image noise of the zero intermediate frequency receiver and improves the sensitivity.