30results about How to "Save frequency band resources" patented technology

The invention relates to a two-way ranging and time comparison processing terminal which is characterized in that: the processing terminal comprises a frequency benchmark, a radio frequency front end, a noise source, a frequency synthesis, a transmitting channel, a receiving channel, a medium frequency signal processor, a machine case, a display and control system, a power source distributor and a LAN switching module, wherein the configuration of the entire processing terminal is a 4U machine case postnotal plate joint interconnecting structure fastened by a standard machine cabinet; the frequency benchmark, the transmitting channel, the receiving channel, the medium frequency signal processor and the power source distributor are arranged inside a standard 4U machine case; the display and control system, which is realized through the configuration of an external notebook computer and display and control software, is in interaction with the outside through the LAN switching module. The entire processing terminal has simple equipment and high integration level; communication, ranging and time comparison are completed inside a unified channel, thereby saving frequency band resource; a pseudo code ranging system is adopted to ensure high ranging precision; moreover, the processing terminal, which has the functions of simulating dynamic state and time delay inside the transmitting channel, is used to realize the quantitative detection of the performance of a receiving terminal.

This invention relates to a method for estimating integrated semi-blind channels and testing data characterizing in overlapping useful signs and known pilot signs of the receiving end to be sent to a channel at the emission end, then the frequency domain channels are turned to limited state units utilizing the frequency domain correlation among the sub-carrier frequency domain channels at the receiving end then to utilize the largest likelihood criterion detector to test useful signs to estimate LS channels and refresh the channel state units to go on to the test to the next useful sign.

The invention relates to a tracking and positioning method four double-synchronization underwater cooperative targets, wherein the system according to the method comprises a sea-level underwater acoustic buoy measurement array and a measurement mother ship. The tracking and positioning method finishes positioning through the following steps: laying the sea-level underwater acoustic buoy measurement array; transmitting a double-synchronization cooperative acoustic signal by underwater targets; receiving returned data of the sea-level underwater acoustic buoy measurement array by the measurement mother ship through a mounted antenna, and finishing target time delay period matching, target position combined resolving, spherical surface equation set solved value returning and target position depth interval by a base station which is composed of a master control computer and an on-ship comprehensive processor, thereby realizing resolving and display to the target position, and realizing tracking and positioning for each underwater target in an area. The tracking and positioning method has functions of effectively reducing frequency band resource required in tracking and positioning multiple underwater targets, reducing confliction or interference between frequency bands used by a positioning system and other mounted equipment, reducing risk in engineering practice, saving designing cost, effectively reducing calculation amount, effectively reducing power consumption of a hardware circuit, and reducing size of the mounted equipment.

The invention relates to the signal channel evaluating and checking method of multi-input multi-output system, wherein it comprises: when evaluating and checking the signal channel of multi-input multi-output system, based on receiving signal, obtaining the related matrix of receiving signal; then processing characteristic decomposition on the matrix to obtain one or several characteristic vectors with larger characteristic value; said vector is relative to the signal channel stat independent component; and using said component to process idle treatment on the receiving signal to check received data.

The invention discloses a terminal access method and system, and the method comprises the steps: determining a frequency band demand table of a terminal according to the residual electric quantity ofthe terminal, wherein the frequency band demand table comprises a frequency band expected to be connected with the terminal; sending a first broadcast message to the blockchain network, wherein the first broadcast message comprises a frequency band demand table and an identifier of the terminal; and in response to a frequency band allocation message sent by the base station, using a working frequency band carried in the frequency band allocation message to access a wireless network provided by the base station, the working frequency band being a frequency band determined by the base station according to the frequency band demand table. The frequency band demand table of the terminal is determined through the residual electric quantity of the terminal, and the frequency band demand table issent to the blockchain network, so that each base station in the blockchain network can know the demand of the terminal for the frequency band; therefore, the base station can allocate the appropriate working frequency band to the terminal according to the frequency band requirement table, the terminal accesses the wireless network according to the working frequency band, the personalized requirement of the terminal is met, and meanwhile, the frequency band resources of the base station are saved.

The invention provides a barrier information acquiring system and method of a low-attitude airspace. The system comprises a launching device, a data acquiring and handling device, a monitoring device,a maintaining device and a background, wherein the launching device is fixed close to a barrier and is used for storing the geographic data of a barrier and then regularly sending to an aircraft which flies nearby in a wireless manner; the data acquiring and handling device on the aircraft is capable of receiving the geographic data, determining the safety based on relative location, navigation direction and navigation speed, and reminding a pilot to avoid risk; the monitoring device is used for monitoring the working state of the launching device and reporting any fault of some launching device to the background through a special communication channel; the maintaining device is used for writing the geographic data of the barrier into the launching device and detecting the data accuracy.The system is not influenced by weather condition and is capable of rapidly supplying and acquiring the barrier location information; the system is high in maintaining performance, low in cost, low inenergy conservation, and environmentally friendly, and plays an important role in ensuring the flying safety in the low-attitude airspace.

The present invention provides a wireless ranging and vehicle anti-collision early-warning method and a system. A transmitting terminal transmits an electromagnetic wave at a maximum transmit power. A receiving terminal receives an electromagnetic wave signal sent by the transmitting terminal, calculates the time duration delta t for the signal strength received within one signal period to be larger than or equal to a threshold critical value delta P or the value of a counter, and determines the distance between the receiving terminal and the transmitting terminal according to the time duration delta t or the value of the counter. When the electromagnetic wave signal transmitted by the transmitting terminal meets the monotonicity property of the a transmitting power function within one signal period, the electromagnetic wave signal is radiated at a single frequency. A vehicle with the above receiving terminal is adopted as an original point, and more than two positions of a vehicle with the above transmitting terminal are measured based on the three-point positioning principle. If a straight line between two positions of the vehicle with the above transmitting terminal passes through the safety running range of the vehicle with the above receiving terminal, the distance is gradually reduced. Meanwhile, drivers are notified of conducting the early-warning operation in advance. The hardware circuit of the system is easy to realize, and low in hardware cost. Meanwhile, the problem of time synchronization between the transmitting terminal and the receiving terminal, and the influence of electromagnetic wave speeds are not considered. The measurement error is very small.

The invention discloses a flexible optical interconnection method for optical mark topping, and the method comprises the following steps: according to an existing optical transport network path plan, carrying out coded modulation on routing exchange node information, granularity information, modulation format information and redundant information, and transmitting together with payload of a service channel to improve the operation efficiency of an optical network; carrying out coding, digital-to-analog conversion and hybrid modulation on the information so as to add the information to a service channel; wherein the part of information needs to be transmitted on the basis of not influencing the original payload, and the information is acquired at a network node through signal receiving and demodulation; therefore, service identification, service tracking and path planning are realized in the optical network, and the complexity of the optical transport network is effectively reduced; meanwhile, the coding process, the modulation process, the channel redundancy and the like are optimized, and the spectrum efficiency is effectively improved on the basis of the requirements.

The invention discloses a transceiver capable of simultaneously transmitting two paths of voice signals. The analog sending end performs digital up-conversion on a voice signal output by a microphonethrough a signal intelligent control module; the output of the mixed sound is transmitted to the signal intelligent control module for A/D acquisition and controls the output of the DDS program control signal source module, and the output analog signal is sent out by the medium power amplifier connected with the antenna. The analog receiving end receives signals through an antenna and adjusts carrier frequency through a filtering and analog signal frequency multiplication module. The voice signals are amplified by the amplifying circuit module and transmitted to the phase-locked loop module tobe demodulated, the output is respectively connected with the two filters, the filtered voice signals with low center frequency directly produce sound through the loudspeaker, and the other signal istransmitted to the signal intelligent control module to perform digital down-conversion and then drive the loudspeaker to produce sound.