42 results about "Transmitter station" patented technology

The invention relates to the technical field of underwater navigation and positioning, and particularly discloses a wide-area very-low-frequency radio navigation and underwater sound combined underwater navigation and positioning method, which comprises the following steps that: a very-low-frequency navigation transmitting station transmits a very-low-frequency radio navigation time service signal; the semi-submersible acoustic beacon receives a very-low-frequency radio navigation time service signal; performing position calibration and time synchronization; the semi-submersible acoustic beacon emits an underwater acoustic navigation signal, and the underwater carrier calculates the three-dimensional coordinates of the underwater carrier according to the received underwater acoustic navigation signal. According to the invention, a shore-based very-low-frequency radio navigation and underwater sound combined navigation mode is adopted, and a very-low-frequency radio navigation time service signal has a certain underwater entry depth, so that the problem of time synchronization between semi-submersible acoustic beacons is solved, and auxiliary calibration of the positions of the semi-submersible acoustic beacons is provided; the semi-submersible acoustic beacon emits an underwater navigation signal to realize navigation and positioning of a deepwater underwater carrier, and reliable navigation service with wide area coverage, high precision and low power consumption is provided for the underwater carrier.

A transmitter station (110) and a receiver station (120) for communication over a wireless communication channel (130) are disclosed. The wireless transmitter station (110) is configured to transmit an indication to the wireless receiver station (120), wherein the indication is indicative of one of a plurality of determination modes of the wireless receiver station (120) for determining a channel quality metric. Moreover, the wireless transmitter station (110) is configured to transmit a sounding signal to the wireless receiver station (120), wherein the wireless receiver station (120) is configured to determine, based on the sounding signal, a channel quality metric according to the indicated determination mode of the plurality of determination modes. The wireless receiver station (120) is configured to receive the indication and the sounding signal, wherein the indication is indicative of one of the plurality of determination modes for determining the channel quality metric based on the sounding signal.

The invention provides a wireless transmitting station alarm method with closed-loop logic and a system thereof. The wireless transmitting station alarm method comprises the following steps: constructing a local vector knowledge base according to existing alarm information; acquiring a real-time alarm, and calling push target information and disposal information matched with the real-time alarm from a local vector knowledge base; pushing the processing information to the mobile phone end of the current watchkeeper according to the pushing target information; and obtaining feedback information of the current watchkeeper, inputting the feedback information into the local vector knowledge base, and updating the local vector knowledge base. The invention solves the technical problems that when a wireless transmission system has a fault alarm, a traditional alarm mode often only prompts the occurrence of a fault simply, and a subsequent disposal mode highly depends on artificial experience, is low in efficiency and is easy to cause omissions.

The invention relates to the technical field of broadcasting, and discloses an abnormity monitoring and warning system based on DRM digital amplitude modulation broadcasting signals, which comprises a control main board, a delay warning setting board, an audio amplitude display board, a tuning screen board and a power supply module, the control main board adopts a main control chip of a high-performance single-chip microcomputer for logic control; the delay alarm setting board is composed of a TM1637 LED drive control special circuit, an LED nixie tube and four function keys. The audio amplitude display panel monitors the audio amplitudes of the signal source signal and the tuning signal in real time through two independent signal processing channels; the tuning screen board comprises a high-precision display unit and a multifunctional control panel. The DRM digital amplitude modulation broadcast audio signal can be received and demodulated without changing a broadcast link of an original transmitting station, whether the signal source audio of the transmitting station and the received audio signal break down or not is monitored and analyzed, the corresponding audible and visual alarm information is sent out when the fault occurs, and the manual inspection intensity is effectively reduced.

The present invention belongs to the technical field related to communication engineering, and discloses a mobile Loran positioning system and its transmission signal modulation method and reception signal analysis method. The analysis method includes: obtaining the modulated pulse groups transmitted in sequence by three signal transmitting devices received by the receiving port, the three modulated pulse groups carrying the coordinate information of the main station, auxiliary station 1 and auxiliary station 2; obtaining the coordinate information of each signal transmitting device through demodulation and decoding, and restoring each modulated pulse to the reference pulse position, and then accumulating to obtain the accumulated pulse of each signal transmitting device; and calculating the receiving position based on the accumulated pulse. Through the above method, the present invention can obtain the coordinate information of the transmitting station on the one hand, support the mobile deployment of the transmitting station, and by restoring the modulated pulse to the reference pulse position and then accumulating, this method eliminates the influence of the pulse modulation position and can obtain the highest accumulated pulse signal-to-noise ratio, thereby improving positioning accuracy.

The invention provides an ionosphere parameter inversion method and device, and belongs to the technical field of short-wave communication, and the method comprises the steps: enabling the actually-measured amplitude and phase difference to be mapped into a low-order wave mode excitation amplitude and a complex feature value through the synchronous receiving of the same very-low-frequency transmitting station signal at different transmitting and receiving distances on the ground; and then fast convergence solution is carried out by using a Newton-Raphson method, and ionosphere electron concentration parameters are circularly corrected by using a gradient descent method, so that the residual error of a theoretical calculation result and a measured value is stabilized within a preset threshold, thereby getting rid of excessive dependence on a traditional ionosphere mode, remarkably improving the inversion precision of low ionosphere parameters, and improving the reliability of the low ionosphere. The method has the advantages of simple operation, low cost and long-term operation.

1. The name of the design product: the shell of wireless charging transmitter. 2. The use of the design product: for charging wireless charging device. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1. 5. Other circumstances that need to be explained: the overall appearance contour of the product is a solid line protection range, and the side and front of the product are a dotted line non-protection range.

The invention discloses a sky wave propagation time delay correction method for improving the equivalent height of an ionized layer. The method comprises the following steps: converting obtained geographical location information of a long-wave transmitting station and a signal receiver into latitude and longitude information; the latitude and the longitude corresponding to the position information of the sky wave signal ionosphere reflection point are obtained by combining a long wave transmitting station; obtaining an annual day and an hour moment corresponding to the emission time of the long-wave emission station for emitting the time service signal; inputting the solar activity F10.7 index and the geomagnetic activity planet index corresponding to the annual day, the hour moment and the emission time into an ionized layer equivalent height model to obtain an ionized layer equivalent height value; obtaining the sight distance extreme value of the radio signal through the ionosphere equivalent height value, and obtaining the actual signal propagation path length of the sky wave signal through the sight distance extreme value; and further acquiring the propagation time delay of the sky wave signal, and acquiring the complete propagation time of the sky wave signal from the long-wave transmitting station to the signal receiver through the propagation time delay. According to the invention, the propagation time delay precision of sky wave signals and the time service precision of a long-wave time service system are improved.

The invention discloses a terrestrial digital television signal single frequency network coverage effect comprehensive test method and a terrestrial digital television signal single frequency network coverage effect comprehensive test system. The method comprises the following steps: carrying out fixed-point receiving test, road test and approaching test on a target area through a pre-constructed terrestrial digital television signal acquisition system; summarizing the collected test data to obtain a first test result of the single-frequency network coverage effect of the ground digital television signal in the target area; under the condition that the first test result comprises that the single-frequency network overlapping coverage interference area exists in the target area, performing shutdown joint debugging test on each to-be-tested transmitting station to obtain a second test result; and according to the first test result and the second test result, determining mutual interference stations of the single-frequency network overlapping coverage interference area and carrying out single-frequency network networking optimization. Through the combination of multiple test modes and the comprehensive analysis of the test result, the actual coverage condition of the terrestrial digital television single-frequency network can be comprehensively reflected, the single-frequency network with problems can be adjusted and optimized, and the coverage effect of the target area can be improved.

This invention discloses a method for precise elevation measurement based on the fusion of wMPS and RTK real-time dynamic positioning systems, comprising: acquiring the two-dimensional planar coordinates of the point to be measured in an external coordinate system, and transforming them to the wMPS transmitter station coordinate system using a pre-calibrated coordinate transformation relationship; receiving the scanning light plane signal using a photoelectric receiver and calculating the relative phase difference when the scanning light plane sweeps across the point to be measured; establishing an instantaneous light plane constraint equation between the spatial coordinates of the point to be measured and the rotating scanning phase; substituting the coordinates of the point to be measured into the instantaneous light plane constraint equation to obtain a system of linear equations with elevation variables and the absolute phase of the rotating scan as variables, and then obtaining a linear expression for the intermediate variable of the rotating scan phase; substituting the obtained intermediate variable of the rotating scan phase into the trigonometric identity constraint to obtain the elevation variable of the point to be measured in the wMPS transmitter station coordinate system, and then outputting the three-dimensional coordinates in the external coordinate system according to the pre-calibrated rigid body coordinate transformation relationship.

A Wi-Fi transmitter station (110; 120) for robust, yet efficient orthogonal frequency division multiplexing, OFDM, based communication with a Wi-Fi receiver station (120; 110) via a wireless channel (130) is disclosed. The Wi-Fi transmitter station (110; 120) is configured to generate a signal carrying a physical-layer protocol data unit, PPDU, wherein the PPDU comprises a preamble part and a data part, and wherein the signal carrying the PPDU is modulated over a plurality of subcarriers spanning a plurality of OFDM symbols. Moreover, the Wi-Fi transmitter station (110; 120) is configured to transmit the signal to the Wi-Fi receiver station (120; 110), wherein the preamble part of the PPDU further comprises a dedicated field comprising one or more OFDM symbols with a guard interval, GI, duration larger than a GI duration of the plurality of OFDM symbols of the data part. The Wi-Fi receiver station (120; 110) is configured to receive the signal with the PPDU.

The utility model discloses a frequency modulation frequency band digital audio broadcast monitoring device which comprises an antenna, an FM tuning decoding module, a CDR digital audio decoding module, an audio switching module, an FPGA processing unit, a single-chip microcomputer, a remote communication module, an audio power amplifier, a loudspeaker, a buzzer and an LED button module. The FM tuning decoding module and the CDR digital audio decoding module output audio signals, and the audio switching module selects channels under the control of the FPGA and outputs the audio signals to the power amplifier driving loudspeaker. The FPGA analyzes the input audio and detects interruption and mute faults; the single-chip microcomputer receives the fault signal to control the buzzer and the LED to give an alarm, and uploads fault information through the remote communication module. The device supports analog and digital broadcast monitoring switching, has the functions of fault detection, alarm and remote monitoring, and improves the intelligent management and safe broadcast guarantee capability of the broadcast transmitting station.

The utility model discloses a main transmitting station, a broadcast-on-behalf transmitting station and an automatic broadcast-on-behalf frequency modulation transmitting system. The main transmitting station at least comprises at least one main station transmitter used for receiving a corresponding frequency information source; the power detection module is connected with at least one master station transmitter and is used for acquiring level signals of all master station transmitters and sending the level signals corresponding to all master station transmitters to the audio switching module; and the audio switching module is connected with the power detection module, and is used for receiving information sources with different frequencies, selecting the information source with the corresponding frequency through each level signal when the level signal indicates that the main station transmitter has a fault, and sending the information source with the corresponding frequency to a broadcasting transmitting station. The main transmitting station obtains the level signal of the main station transmitter through the power detection module, and the audio switching module selects the information source of the corresponding frequency according to the level signal, so that the information source can be automatically sent to the substitute broadcasting transmitting station when the main station transmitter fails, and the substitute broadcasting transmitting station performs substitute broadcasting.

This utility model discloses a novel wireless transmitter source switching system, comprising a loop control module, a signal output module, a signal detection module, a working indicator module, and a signal input module. The signal output module, signal detection module, working indicator module, and signal input module are electrically connected to the loop control module. A power control module is electrically connected to each of the loop control module, signal output module, signal detection module, and working indicator module, and is powered by AC mains electricity. This utility model relates to the field of automatic source switching for wireless broadcast transmitters, specifically a novel wireless transmitter source switching system.

A Wi-Fi transmitter station for communication with at least one Wi-Fi receiver station (120; 110) comprising a communication interface (113; 123), further comprising one or more power amplifiers (113a; 123a) and a plurality of antennas (113b; 123b) configured for a multiple- input multiple-output, MIMO, transmission to the at least one Wi-Fi receiver station with a power back-off of a maximum transmission power of the Wi-Fi transmitter station, wherein the communication interface is further configured to transmit to and / or receive from the at least one Wi-Fi receiver station an indication of, i.e. information about a power back-off correction value for adjusting the maximum transmission power. Moreover, the Wi-Fi transmitter station comprises processing circuitry configured to determine, i.e. set a transmission power for the MIMO transmission to the at least one Wi-Fi receiver station based on the maximum transmission power and a power back-off value reduced by the power back-off correction value.

The utility model discloses an automatic recording instrument for tunnel lining deformation, and relates to the technical field of tunnel safety monitoring, the automatic recording instrument for tunnel lining deformation comprises an information processing input terminal, a deformation monitoring assembly and a data monitoring assembly, the deformation monitoring assembly comprises an optical fiber cable, and the optical fiber cable is connected with the information processing input terminal. The optical fiber cable is provided with an optical fiber grating sensor; the data monitoring assembly comprises an optical signal transmitting station, the optical signal transmitting station is provided with an optical signal transmitter, the optical signal transmitting station is provided with a signal receiving station, and the signal receiving station is provided with a signal receiving mechanism. After the optical signal emitted by the optical signal emitter is reflected and received by the fiber grating sensor, the tunnel lining deformation can be monitored according to the change of the reflected optical signal, the data is automatically recorded through the information processing and recording terminal, the anti-interference capability of the optical fiber is strong, and the monitored data is accurate.

A transmitter station (110; 120) for a wireless communication network (100), in particular a Wi-Fi network (100) is disclosed. The transmitter station (110; 120) is configured to broadcast successively a plurality of beacon frames (140) to one or more receiver stations (120; 110) of the wireless communication network (100), wherein each beacon frame (140) comprises information for synchronizing a timer. Moreover, the transmitter station (110; 120) is configured to send a data frame (150) to the one or more receiver stations (120; 110), wherein the data frame (150) comprises an encrypted timer value associated with the data frame (140). The transmitter station (110; 120) and the one or more receiver stations (120; 110) may detect a man-in-the-middle attack and, in response, perform suitable counter measures.

The invention discloses a novel radio station based on voice recognition and translation, which is characterized in that voice recognition is carried out on the voice of a sender to generate corresponding language coding information, the information is modulated by a digital modulation module and then forms a radio frequency signal through a frequency mixing amplification module, and the radio frequency signal is transmitted to the air through an antenna; after receiving a radio frequency signal through an antenna, the receiving station generates an intermediate frequency digital modulation signal through a frequency mixing amplification module, then demodulates the intermediate frequency digital modulation signal into language coding information of a speaker of the transmitting station through a digital demodulation module, and forms language digital voice information corresponding to a listener of the receiving station after the language coding information is processed by a voice translation module in a voice processing module. The digital-to-analog signal conversion is realized through the D / A conversion module, the analog signal is sent to the earphone through the power amplification module to form a voice message which can be understood by a receiver, the occupied bandwidth is far smaller than that of a traditional radio station, and meanwhile, barrier-free cross-language communication can be realized.

The utility model relates to a short wave transmitter fault state monitoring system comprising a lower computer, a transmitter signal acquisition system in information connection with the lower computer, an upper computer in information connection with the lower computer, a human-machine interface HMI in information connection with the upper computer, and a cloud server. And the transmitter signal acquisition system is in information connection with the plurality of JRC transmitters and is used for acquiring and monitoring operation parameters and fault signals of the JRC transmitters. The system can collect and monitor operation parameters and fault signals of the short-wave transmitter, timely discover equipment faults, realize operations such as monitoring alarm and state prompt, avoid communication interruption, display related data on a monitoring interface of an on-duty station, realize remote guarding of the short-wave transmitter and the transmitter, and improve the working efficiency of the short-wave transmitter. And technical support is provided for construction of smart radio stations.

The invention discloses a communication efficiency evaluation method for a short-wave access network. The method comprises the following steps: step 1, selecting a short-wave communication transmitting station; 2, initializing a background ionized layer; step 3, calculating short-wave communication power based on a ray tracing theory of a complex refractive index; step 4, determining the passable range of the polar region short-wave access network; and step 5, evaluating the efficiency of the polar region short-wave networking. According to the method disclosed by the invention, the short-wave communication power is calculated by using a ray tracing theory based on a complex refractive index, a transmitting station is selected according to actual needs, and the coverage range and efficiency evaluation of polar region short-wave networking communication is given.

The utility model discloses a fault alarm device for a cooling fan of a PDM (pulse width modulation) type medium-wave broadcast transmitter, and belongs to the technical field of PDM type medium-wave broadcast transmitters. Comprising a sampling circuit, a rectification filter circuit, a voltage amplification circuit, a voltage reference circuit, a voltage comparison circuit, a control circuit, an alarm circuit and a power supply circuit, can rapidly and accurately detect the fault of the cooling fan of the PDM system medium-wave broadcast transmitter, improves the timeliness and reliability of fault early warning, and is low in cost and easy to popularize. The system is simple in structure, easy to implement and popularize, suitable for medium wave transmitting stations of various scales, and beneficial for finding and processing problems in time by monitoring the running state of the heat dissipation fan in real time, potential broadcast accidents are avoided, normal running of a transmitter is guaranteed, the risk that the performance of the transmitter is reduced or damaged due to faults of the heat dissipation fan is reduced, and the service life of the transmitter is prolonged. And safe and high-quality broadcasting of broadcast signals is ensured.

A system ensures reception in low reception or no reception areas and adds regionalized experiences in digital broadcasting. The system includes main transmitter stations and many local or regional transceiver stations. Feedback exists between the local and main transmitter stations to fine tune the transmitted signals based on reception quality, location and the like. The addition of localized or regional content is based on parameters such as user preferences and local data. The regionalized content may vary from local news, local advertisements, customized advertisements, advertisement placement based on social media services data, local emergency warnings, and other parameters. The system addresses both reception issues as well as content regionalization blended with original channel information that are of interest to users of a specific region.

According to the apparent plate shape detection device for the copper alloy medium and thick plate, laser rays emitted by the laser emission table irradiate the plate, and a clear point diagram is formed on the plate shape datum plate after the laser rays are reflected by the plate. By observing the moving range of the light spots in the point diagram on the plate shape datum plate, most of various apparent plate shape problems such as middle waves and edge waves of the plate can be judged on line, accurate control over the plate quality of the roughing mill is ensured, the production pressure of follow-up finish rolling equipment is reduced, and the production efficiency is comprehensively improved. The device belongs to a matched device of a copper alloy cold rolling and roughing mill, is suitable for online detection of the plate type of a medium-thickness plate with the thickness of 1.0-16.0 mm, provides real-time data, provides data support for revision of rolling parameters of a machine table, and has good popularization and application values.

The invention belongs to the related technical field of communication engineering, and discloses a maneuvering Roland positioning system and a transmitting signal modulation method and a receiving signal analysis method thereof, and the analysis method comprises the steps: obtaining a modulation pulse group which is received by a receiving port and sequentially transmitted by three signal transmitting devices, the three modulation pulse groups carry coordinate information of the main station, the auxiliary station 1 and the auxiliary station 2; obtaining coordinate information of each signal transmitting device through demodulation and decoding, recovering each modulation pulse to a reference pulse position, and accumulating to obtain an accumulated pulse of each signal transmitting device; a receiving position is calculated based on the accumulated pulses. According to the method, on one hand, the coordinate information of the transmitting station can be obtained, the maneuvering deployment of the transmitting station is supported, the influence of the pulse modulation position is eliminated by restoring the modulation pulse to the reference pulse position and then performing accumulation, and the highest accumulated pulse signal-to-noise ratio can be obtained, so that the positioning precision is improved.

An estimation device for estimating, during an aircraft approach procedure for landing on a runway following a predefined runway approach, a deviation relative to a reference guidance axis corresponding to the predefined runway approach, and a speed of an aircraft relative to the runway, the approach procedure being carried out with a landing aid device including at least one transmitter station configured to transmit the reference guidance signal defining the reference guidance axis. The estimation device includes an acquisition unit for a current aircraft position of a geo-positioning system, an acquisition unit for a current acceleration of an inertial unit, an acquisition unit for a current lateral and vertical deviation of a landing aid device, a filtering unit for estimating an unbiased aircraft speed, a filtering unit for estimating a current lateral deviation, a current vertical deviation as well as current lateral and vertical speeds of the aircraft.

The invention relates to the technical field of navigation and positioning, in particular to an underwater wide-area navigation and positioning construction method and system.The method comprises the steps that the electric field intensity of very-low-frequency radio in the long-distance propagation process is calculated according to the transmitting frequency of a very-low-frequency transmitting station, and the cross-domain navigation coverage range is calculated according to the underwater entry depth of the electric field intensity; constructing a very-low-frequency radio cross-domain navigation network in a land-based layout mode by taking a cross-domain navigation coverage range and GDOP distribution as thresholds; constructing a low-frequency remote acoustic navigation network by adopting a seabed subsurface buoy layout mode on the basis of the water depth and terrain required by acoustic propagation; and performing underwater wide-area navigation positioning according to the very-low-frequency radio cross-domain navigation network, the low-frequency remote acoustic navigation network and inertial navigation. According to the method, a multi-source fusion navigation mode of low-frequency radio cross-domain navigation, low-frequency remote acoustic navigation and inertial navigation is realized through a factor graph fusion algorithm, and navigation and positioning in an underwater wide-area range are realized.

The present application relates to navigation positioning technical field, especially underwater wide-area navigation positioning method and system, method includes according to the transmission frequency of very low frequency transmitting station to calculate the electric field intensity in the long-distance transmission process of very low frequency radio, according to the electric field intensity to calculate the cross-domain navigation coverage range of water depth;With the threshold of cross-domain navigation coverage range and GDOP distribution, the land-based layout method is used to construct very low frequency radio cross-domain navigation network;With the water depth and terrain required for sound propagation as the benchmark, the submarine buoy layout method is used to construct low-frequency long-range acoustic navigation network;According to the very low frequency radio cross-domain navigation network, low-frequency long-range acoustic navigation network and inertial navigation, underwater wide-area navigation positioning is carried out.The present application realizes the multi-source fusion navigation mode of low-frequency radio cross-domain navigation, low-frequency long-range acoustic navigation and inertial navigation through factor graph fusion algorithm, and realizes navigation positioning in underwater wide-area range.

The utility model discloses a novel broadcast signal electronic attenuator system of a broadcast television transmitting station, which belongs to the technical field of electronic attenuators and comprises an electronic attenuator, and the electronic attenuator comprises a touch one-out-of-three control circuit and a judgment and amplitude modulation control circuit. A digital potentiometer DS1669 integrated block, a D-type trigger CD40175B integrated block and other integrated circuits form a radio and television transmitting station broadcast signal electronic attenuator system without mechanical switch contacts and potentiometers, so that safe broadcast accidents caused by poor contact of the attenuator are avoided. The circuit design is simple, debugging is not needed, mechanical contacts and potentiometers are not needed, and broadcast safety accidents caused by poor contact are eliminated; after being used for a long time, the device is safe and reliable, has no fault until now, and is good in use effect. In conclusion, the product has good use value and wide market prospect.

This invention discloses a positioning device and method for the cable-stayed bridge main beam end cable sleeve, including a laser transmitter (1) fixed on the reserved cable-passing hole of the steel box girder and a target receiving device (2) fixed on the front end of the cable sleeve; the laser transmitter includes a positioning frame (3) fixed on the reserved cable-passing hole of the steel box girder and a laser emitter (4) set on the positioning frame; the target receiving device includes a positioning frame fixed on the front end of the cable sleeve and a positioning target (5) fixed on the positioning frame; this invention has a simple structure, accurate positioning of the cable sleeve angle, and convenient installation, which improves the concentricity of the cable and the cable sleeve, construction efficiency and construction safety.

The utility model relates to the technical field of information communication, and discloses an emergency communication device comprising a processor module; the wireless communication module is connected with the processor module through an SPI (Serial Peripheral Interface) bus; the transmitting module is electrically connected with the processor module through an I2C bus; the mediation module is electrically connected with the processor module through an I2C bus; and the display module is electrically connected with the processor module through an I2C bus. The emergency communication device solves the problems that in the prior art, signals of the emergency communication device are seriously influenced in mountain forests or severe weather, when a resident residence place is far away from an FM broadcast transmitting station, the signals are blocked easily, and when natural disasters occur, alarm signals cannot be received and cannot be avoided in time, so that the occurrence of the natural disasters is influenced. And serious personnel and property loss is caused.