102results about How to "Improve the receiving signal-to-noise ratio" patented technology

A method and an apparatus for realizing a multibeam smart antenna by directional antennas in a mobile communication system, are provided. The method comprises performing space division on a base station service region by N directional antennas independent with one another to divide the base station service region into N cells, each cell satisfying a perdetermined electromagnetic radialization request; composing a delamination multibeam array by the N directional antennas based on the region to be covered by the base station, the directional antenna adjusting direction of the beam in advance to realize space division multiple access, the antenna for performing transmission and receiving of signals are controlled by a main processor unit, auxiliary processors and an antenna selection unit to position and track a mobile user. The apparatus includes a delamination antenna array composed of N directional antennas independent with one another, the antenna selection unit, auxiliary processors, a main processor; wherein the N directional antennas are connected with input ends of the auxiliary processors respectively, the auxiliary processors are connected with the antenna selection unit and the main processor respectively, the main processor is connected with the antenna selection unit and the base station. The invention has a high communication capacity and immunity.

The invention discloses a synchronous realizing method in the orthogonal frequency-division multiplying system, which comprises the following steps: constructing front / synchronous sequence at the transmitting end to frame and transmit; combining the CP information to do one-time synchronization; utilizing front symbol to estimate the integral times and decimal time-domain frequency deviation; compensating the frequency deviation; using front symbol to do secondary time synchronization; proceeding disposal after synchronizing. The invention improves the synchronous precision to modify the system property as well as the received signal-to-noise ratio, which reduces the calculating quantity without adding the burden of system.

The present invention relates to use of a smart antenna for a RF reader on a Radio Frequency Identification (RFID) system to significantly increase the operating range of the RFID system. The smart antenna can be an adaptive antenna array. The smart antenna comprises a plurality of antenna elements and, by combining the signals from multiple antenna elements, significantly increases the received signal-to-noise ratio. In a noise limited environment, combining the signals to maximize the received signal-to-noise ratio can be based on the maximal ratio combining (MRC) principle. To achieve the best signal quality, the received signal from each antenna can be phase-shifted such that the resultant signals from all antennas are in phase. In addition, the signal from each antenna can be scaled in amplitude based on the square root of its received signal-to-noise ratio.

The method includes following steps: constructing leading / synchronizing sequence on each transmission antenna, as well as carrying out framing and sending operations; carrying out once time synchronization by combining with cycling prefix information on each receiving antenna; using the leading symbols to carry out frequency deviation estimation (FDE) in time domain in integral multiple and decimal multiple for each receiving antenna; merging in equal gain for value of FDE on each receiving antenna so as to obtain final average value of FDE, and carrying out compensation of FDE for data of each receiving antenna; using leading symbol to carry out second synchronization for time; selecting best point of second synchronization for time; using the obtained best point to carry out synchronous post-processing. Satisfying precision required by operation, the invention raises SNR for received signal, does not use too much system resources, and increase redundancy of system, etc.

The embodiment of the invention provides a method, a base station and a system for transmitting subcarriers. The method comprises the steps: dividing a plurality of subcarriers of signals to be transmitted on the entire frequency band into a plurality of transmission groups; distributing the subcarriers of the signals to be transmitted on the entire frequency band to at least two transmission antennas of the base station and broadcasting and transmitting the signals. The method and the system for transmitting subcarriers can enhance the average power of each subcarrier for transmitting the same OFDM signal by a plurality of transmission antennae under the condition that each antenna transmits partial data by synchronous / broadcasting / controlling channels formed by omnibearing wave beams, thereby increasing the coverage range of downlink channels of the base station, raising the signal-to-noise ratio for the reception of user equipment, ensuring the reliable decoding of information transmitted by the user equipment to the base station, enlarging district edge coverage and increasing the throughput.

The invention discloses a parallel disturbance compensation method of controlling channel, which comprises the following steps: expanding, consolidating and sentencing receiving signal of DPCCH channel of every user by base station; getting demodulation judgement information; restructing received signal of DPCCH channel of every user according to pilot information and conciliation decision information of DPCCH channel; carrying out disturbance compensation dealing received user baseband data according to reconstructed signal.The invention needs one conciliation course and smaller resource, which reduces stand-by time lag of baseband data storage and business channel conciliation process according to reconstruct received signal of user DPCCH by time slot TPC signal.

The invention provides a random access method based on a difference beam, base station equipment and user equipment. The random access method based on the difference beam comprises the following steps: receiving a leading sequence from first UE (User Equipment) by the base station equipment through a difference beam receiving mode; based on the leading sequence, determining an angle deviation of a base station in a beam direction; and performing base station beam adjustment according to the angle deviation of the base station in the beam direction, and transmitting a random access response signal to the first UE through the adjusted base station beam. The random access method based on the difference beam provided by the invention detects the angle deviation of the base station in the beam direction through the difference beam receiving mode, which can adjust a receiving beam of the base station to an optimal beam more quickly than a beam polling mode in the prior art, thereby improving the performance of a random access process.

The invention discloses a signal processing method for a multi-user multi-input multi-output downlink and a system thereof, wherein the system comprises the following steps: an S102 step that transforming a channel matrix fed back by a receiving end through the lattice-reduction algorithm, an S104 step that conducting the linear precode for a sending signal through a transformed linear precode matrix, and an S106 step that restricting the size of the sending signal passing through the linear precode through a modular arithmetic unit. The invention effectively reduces the emitting power of thelinear precode algorithm, inhibits the noise enhancement, increases the receiving signal-to-noise ratio (SNR), and improves the error code percentage performance of the system.

The invention discloses a Fresnel telescope imaging laser radar, which comprises a laser, a transmitting polarization beam splitter, a first channel space phase modulator, a second channel space phase modulator, a transmitting polarization beam combiner, a laser amplifier, a transmitter-telescope, an optical beam scanner, a receiver-telescope, a receiving polarization beam splitter, a 2*4 90-degree space optical hybrid, an A-path balanced receiver and an A-path amplification and analog to digital converter, a B-path balanced receiver and a B-path amplification and analog to digital converter, a pluralizing device, a time and space coordinate converter, a resampling interpolation space coordinate converter, a matching filter and a control computer. The Fresnel telescope imaging laser radar can realize two-dimensional imaging of a target in a super optical resolution limit, improves the receiving sensitivity and imaging signal-to-noise ratio, greatly increases receiving optical aperture and reduces laser transmitting power. The optical mechanical structures and electronic equipment are simple, and the Fresnel telescope imaging laser radar is a high-resolution imaging laser radar capable of overcoming influence of atmospheric turbulence.

The present invention discloses a bipolar binary shift pulse keying modulation and demodulation method. The method is characterized by carrying out the pulse modulation on a symbol 0 having the reverse polarity with the pulse modulation of a symbol 1 on the basis of a binary shift pulse keying modulation mode in a uniform orthogonal binary shift keying modulation and demodulation method and in the initial information modulation interval of each symbol cycle, thereby greatly reducing and even completely eliminating the all discrete line spectrums containing a carrier frequency, and substantially expanding the constellation point distances among the symbols. By adopting a dual matching filtering method of impact filtering-multiplying coherent carrier-low pass filtering or band-pass filtering- related demodulation to demodulate, and by utilizing the dual filtering noise reduction removing interference capability of the impact filtering and the low pass filtering or band-pass filtering and the dual symbol energy maximization effect of the coherent demodulation and related demodulation, a received signal to noise ratio and an energy utilization rate can be improved remarkably, and the noise restraint anti-interference performance of a system can be enhanced substantially.

The invention provides a telescope array optical signal reception method based on self-adaptation control of amplitudes and phases. The method comprises the following steps of A, realizing multi-element array reception on optical signals by a telescope array; B, amplifying and filtering the optical signals coming out of each telescope channel successively; C, controlling phase shifters by the feedback of the output end of a superposition output unit to realize the self-adaptation control on the phases, and controlling amplification factors of amplifiers by the feedback of output ends of the amplifiers to realize the self-adaptation control on the amplitudes; and D, enabling the optical signals of all the channels to enter the superposition output unit for coherent superposition after the self-adaptation control of the phases and the self-adaptation control of the amplitudes are performed on the optical signals to obtain high-sensitivity output signals. The invention also provides a telescope array optical signal reception device based on the self-adaptation control of the amplitudes and the phases. The telescope array optical signal reception method and the telescope array optical signal reception device based on the self-adaptation control of the amplitudes and the phases provided by the invention have the beneficial effect that high-sensitivity and high-signal to noise ratio reception is realized on wireless optical signals under the conditions of strong background interference and weak optical signals.

The invention relates to a remote steady communication method for an underwater unmanned platform. By use of the physical characteristic that an underwater acoustic channel is asymmetric about time and by use of a bidirectional adaptive multichannel decision feedback equalizer formed by combining a time reverser and an adaptive multichannel decision feedback equalizer, equalization of a single vector hydrophone-based bidirectional adaptive multichannel decision feedback equalizer is carried out. The remote steady communication method for the underwater unmanned platform introduces an error feedback filter circuit to form the bidirectional adaptive multichannel decision feedback equalizer, so as to carry out the equalization of the single vector hydrophone-based bidirectional adaptive multichannel decision feedback equalizer. According to the remote steady communication method for the underwater unmanned platform, the probability of a signal decision mistake is reduced, and the equalization error rate is further reduced; an error in the past time is fed back into the equalizer to reduce the relevancy between error signals in the equalizer, so that the error rate after the equalization is further reduced, and the steadiness of a receiver is effectively improved; and the equalization performance of the receiver is further improved.

The invention provides an annular laser-electromagnetic ultrasonic focusing probe which comprises a probe shell, an optical lens group, an optical fiber, an annular permanent magnet, an annular receiving coil and an annular focusing laser beam. The optical lens group is fixed in the probe shell, the optical fiber is connected at the top of the probe shell and used for leading in a single-beam laser source, the annular permanent magnet is fixed at the bottom of the probe shell, the annular receiving coil is centrally pasted at the bottom of the annular permanent magnet, the single-beam laser source led-in by the optical fiber is coincided with an optical axis of the optical lens group, the annular focusing laser beam is formed at a probe outlet and used for exciting focusing ultrasonic waves in a metal sample, and the inner diameter of the annular permanent magnet and the annular receiving coil is larger than the outer diameter of the annular focusing laser beam. According to the focusing probe, the optical lens group generates annular lasers, ultrasonic body waves of point focusing can be excited, focusing ultrasonic echo signals are received by the aid of the annular permanent magnet and the annular receiving coil, integral transceiving is achieved, and the capability for detecting defects of metal structure bodies is enhanced. The probe is compact in structure, convenient to move and operate and high in detection efficiency and can be used for detecting inner defects of metal materials.

The invention belongs to the technical field of mobile communication, in particular to a multicast transmit beamforming method and system based on angle information. In the invention, the angle information of target mobile stations is utilized to replace the complete channel information used in the traditional beamforming algorithm, thus the method and system are more suitable for a trunking communication system unable to obtain the channel information timely; and the beamforming gain is also utilized to replace the signal to noise ratio (SNR) used in the traditional beamforming algorithm to serve as the new beamforming optimization target, so the specific channel information can not be involved. The flow related to the invention comprises the following three steps: firstly, obtaining the angle information of the mobile stations by a base station; secondly, generating a beamforming vector based on that the beamforming gain serves as the optimization target; and finally, combining the beamforming vector with the signal to finish transmitting. According the invention, the received SNRs of the target users in the group sending services in trunking communication can be obviously improved; and the method and system provided by the invention are very applicable to the trunking communication system.

The invention belongs to the technical field of FM signal processing, and discloses an earphone circuit and a method for processing FM frequency band signals received by an earphone. The method comprises the following steps of: performing low impedance processing on an FM frequency band noise signal coupled to an audio signal through a first capacitor; continuing to perform attenuation processing on the FM frequency band noise signal through magnetic beads to make the energy of the FM frequency band noise signal further reduced; and coupling the FM frequency band signals of a left channel and a right channel of the earphone through a second capacitor to make the strength of the FM frequency band signals increased. The method can inhibit the FM frequency band noise signal in a listening end system from transmitting outwards and enhance the receiving strength of useful FM frequency band signals, thereby effectively improving FM receiving signal-to-noise ratio.

A multipath signal carrier phase error estimation device is used to realize the coherent demodulation of down rake receiver. The expressions of the multipath received signal carrier wave and the local carrier phase error theta can be exported according to the expression of multipath received signal and the following instruction book provides the exporting process; the multipath signal carrier phase error estimation device is provided according to the expressions. The device separately sends the outputs of QAM coherent demodulator to six multiplier units of In-phase and Quadrature, the outputs of three multiplier units of In-phase are sent to three processors and then sent to the other three multiplier units to be multiplied by the three outputs of three multiplier units of Quadrature, and finally the phase error tracking signal of signal in each path can be obtained; the phase error tracking signal control phase shifter adjusts the phase of local coherent carriers and recovers the local coherent carriers which are separately synchronous with three-path received signal carriers, the local coherent carriers are used to demodulate three-path signals and finally the In-phase and Quadrature of the three-path signals are separately combined and descrambled.

The invention relates to a submersible buoy seismic data acquisition station which solves the problem of difficult marine seismic signal acquisition of the existing technology, and is composed of a hydrophone, a buoy, a connecting rod, a digital unit, a control module, a data communication unit, GPS and a power supply module. The buoy floats on the water surface. The hydrophone is placed underwater. The hydrophone and the buoy are connected through the connecting rod L. The digital unit, the control module, the data communication unit, the GPS and the power supply module are arranged in the buoy. The power supply module powers the digital unit, the control module, the data communication unit and the GPS. The control module establishes communication connection with an external host through the data communication unit, and receives an instruction of the external host or a preset instruction to control the digital unit, the data communication unit WU, the GPS and the power supply module. The data communication unit provides a communication service for the acquisition station. The digital unit converts an analog signal of the hydrophone into a digital signal. The GPS unit provides location information and a time marker for the acquisition station. The submersible buoy seismic data acquisition station has the advantages of good stability and noise reducing, and is conducive to improving the seismic signal receiving sensitivity and the signal to noise ratio.

The invention provides a beam forming method for a three-hop relay collaborative communication model. Under the condition that the total power of a relay node is strived not to exceed a certain threshold value, the received signal-to-noise ratio of a destination node is maximum. Two relay node groups exist in the three-hop relay collaborative communication, and each group corresponds to respective beam forming weight vectors. The beam forming method alternately fixes two relay node group weight vectors, applies semi-definite relaxation to convert the original problem into a convex optimization problem, then applies methods, like an interior point method, passes through a plurality of iterations, and finally achieves joint optimization of two weight vectors.

The invention discloses a follow-up tracking WIFI transmission device and a control method thereof. The device includes a cloud deck controller, and an acceleration sensor, a geomagnetic sensor, a Beidou navigation receiver, a wireless communication unit, a WIFI unit and an antenna cloud deck connected to the cloud deck controller. The device also includes a directional antenna arranged on the antenna cloud deck. The directional antenna is connected to the WIFI unit. The control method includes determining the coordinates of the device itself through Beidou satellite signals and sending the coordinate information to other access points; determining an optimal communication chain according to the combination of a routing algorithm and the coordinate information of the whole communication access point combined; determining the posture information of the device itself through the geomagnetic sensor; calculating the antenna azimuth angle and controlling the antenna cloud deck for antenna alignment. According to the invention, long range WIFI communication is realized and a problem of dynamic moving network construction of multiple access points when using the directional antenna is solved. Effects in aspects of prolonging WIFI communication distance, improving communication security, improving network invulnerability, reducing electromagnetic interference and the like are obvious.

Transmitting apparatus and receiving apparatus for communication systems using coded orthogonal frequency-division multiplexed (COFDM) dual-subcarrier modulation (DCM) signals. The same coded data is mapped both to COFDM subcarriers located in the lower-frequency half spectrum of the DCM signal and to COFDM subcarriers located in its upper-frequency half spectrum. The mapping of COFDM subcarriers in those half spectra employ labeling diversity. A primary design goal in some preferred labeling diversity formats is to support reception of DCM with less error when accompanied by interfering additive white Gaussian noise (AWGN). A primary design goal in some preferred labeling diversity formats is to reduce the peak-to-average power ratio (PAPR) of the COFDM DCM signals. In preferred forms of COFDM DCM signal, the quadrature amplitude modulation (QAM) of COFDM subcarriers is Gray mapped to position palindromic lattice-point labels along one of the diagonals of each square QAM constellation.

The invention relates to the technical field of visible light communication and in particular discloses a remote visible light communication transceiving system. The remote visible light communicationtransceiving system comprises a transmitting device and a receiving device, wherein the transmitting device comprises a sight mirror, an LED light source and a collimation lens; the sight mirror is arranged at the top of the transmitting device; the LED light source and the collimation lens are arranged inside the transmitting device, and the LED light source is arranged at a focal point of the collimation lens; the receiving device comprises the sight mirror, an objective lens and a detection device; the sight mirror is arranged at the top of the receiving device; the objective lens comprises a primary lens and a secondary lens, and the secondary lens is arranged at one end, close to a receiving hole, of the receiving device; the primary lens is arranged at the other end of the receivingdevice, a through hole is formed in the center of the primary lens, the through hole is connected with the detection device, and the detection device is provided with an image sensor, a rotatable retroreflector and a detector. The remote visible light communication transceiving system disclosed by the invention has the advantages that emitted lights are collimated, coarse tuning can be carried out on a visible light communication direction by utilizing the sight mirror, and then fine tuning is carried out by utilizing the image sensor, so that received signal-to-noise ratio is increased, andcommunication interference is reduced.

The invention discloses a downlink transmission method for a multi-user MIMO (Multiple Input Multiple Output) system based on singular value decomposition, which mainly solves the problem on poor transmission performance caused by low signal-to-noise ratio of the receiving end in existing transmission method. The method is realized by the following steps of: (1) writing an information symbol sent by a base station into a column vector, creating a power adjustment matrix, and determining a disturbance coefficient vector; (2) creating a preprocessing matrix for removing multi-user interference; (3) determining an optimal disturbance vector and a power control coefficient; (4) generating a sent signal from the base station end and sending the signal; (5) receiving the signal by the user end; (6) creating a post-processing matrix for post-processing of the received signal; (7) carrying out a mode operation on the post-processed signal; and (8) judging and outputting the signal after the mode operation. The method provided by the invention improves the transmission performance of the system by increasing the signal-to-noise ratio of the receiving end and can be applied to the downlink transmission of the multi-user MIMO system.

The invention provides an optical antenna integrating polarization, isolation, receiving and transmitting. A laser beam of a laser emission module passes a wave plate group formed by a lambda / 4 wave plate and a second lambda / 2 wave plate to become S linearly polarized light. The S linearly polarized light reaches a first lambda / 2 wave plate through a polarization beam splitter to be modulated into linearly polarized light, wherein an angle of 45 degrees is formed between the linearly polarized light and the original polarization direction. The linearly polarized light is emitted through a collimating mirror and an optical antenna. During receiving, an incidence light signal received by the optical antenna reaches the first lambda / 2 wave plate through the collimating mirror, and is subjected to transmission and modulated into linearly polarized light of P polarization. The linearly polarized light of P polarization is output in a lossless manner through the polarization beam splitter, reaches an optical receiving module through a light gathering mirror and then is received by a detector of the optical receiving module. The optical path of the receiving light output by the polarization beam splitter is perpendicular to the optical path of the emission light entering the polarization beam splitter. The same optical antenna of the receiving end is arranged opposite to the emission end. An angle of 45 degrees is formed between fast axes of the first lambda / 2 wave sheets of the receiving end and the emission end. Thus, weight and size of the system are greatly reduced; networking is convenient to perform; reliability is high; receiving signal to noise ratio is improved; and the optical antenna is especially suitable for satellite optical communication.

The invention provides a water sound OFDM communication system selectivity mapping peak-to-average ratio inhibition algorithm based on orthogonal pilot frequency sequences. Problems of adding of different orthogonal pilot frequency sequences to a sending end, the high peak mean value power ratio of an OFDM signal and the requirement of transmission of sideband information (SI) by use of the self correlation features are solved. By multiplying sending data with a scrambling phase position sequence and adding different orthogonal pilot frequency sequences, the peak to average power ratio of the OFDM signal is reduced. By using different orthogonal comb-shaped pilot frequency to mark the scrambling phase position sequence, and using the self correlation features of the orthogonal pilot frequency sequences on a receiving end, autonomous identification of the scrambling phase position sequence is achieved and selectivity mapping peak-to-average ratio inhibition without transmission of sideband information is achieved. According to the invention, the inhibition algorithm has better PAPR inhibition performance and perfect sideband information detection performance than a traditional algorithm; reliable water sound communication without sideband information is achieved; and efficiency and reliability of a communication system is effectively improved.

The invention discloses a distributed loop overlap space time code transmission method based on a bidirectional multi-relay network. The problems that the diversity gain is low, the error rate performance is poor and the detector is complex in the prior art are mainly solved. The method comprises the following implementation steps: two source nodes perform precoding on a baseband modulation signal to obtain a source node transmission signal; the two source nodes simultaneously transmit the precoded signal to all relay nodes; all the relay nodes receive the signals transmitted by the two source nodes; each relay node performs linear compression processing on the received signal, so that transmission signals on two antennas can be obtained and are transmitted to the two source nodes; and the two source nodes receive the signals transmitted by the relay nodes and construct a determination signal, and finally the determination signal is detected by employing a maximum likelihood detection method. The method has the advantages of improving the error rate performance of the system, obtaining the full diversity gain and maximum coding gain and lowering the complexity of the detector and can be used for bidirectional multi-relay network transmission.

A signal transmission method based on binary phase shift keying modulation and orthogonal frequency division multiplexing technology. The conventional bpsk signals on the frequency domain subcarriersare grouped, each packet signal is transformed into a new packet signal containing two consecutive zero signals and six BPSK signals. The new packet signal is interleaved by a channel and then subjected to an inverse Fourier transform, and the generated time domain OFDM signal is added with a cyclic prefix and sent to a communication channel. After receiving the signal, firstly, the received signal is Fourier-transformed, then inverse channel interleaved, and then the signal is grouped and demodulated. Firstly, the positions of two zeros in each grouped signal are determined based on the energy of the signal. Then, the analysis results of the other six BPSK signals are obtained according to the grouped inverse mapping relation and the traditional OFDM signal processing mechanism. The invention improves the transmission mechanism and can obtain lower transmission error rate performance than the traditional BPSK + OFDM modulation method under the same information transmission rate.

A method for transmitting a binary frequency shift keying signal comprises the steps of grouping the conventional 2FSK signals, converting each grouping signal into a new grouping signal comprising two consecutive zero signals and six 2FSK signals according to a specific mapping relationship, and then interleaving the new grouping signal through a channel and transmitting the new grouping signal to a communication channel; After receiving the signal, at first, interleaving the receive signal through an inverse channel and then demodulating by signal grouping, When demodulating the signal subsequence, judging the position of the zero signal in each packet signal based on the energy of the signal, and then obtaining the analysis results of the other six FSK signals according to the inverse mapping relation,the analysis results of the eight received signals forming the decoding subsequence, and all the decoding subsequences forming the transmitted signals. By improving the transmission mechanism, the invention can obtain lower transmission error rate performance than the traditional 2FSK modulation method under the condition of the same information transmission rate.

The invention discloses a mobile phone TV terminal and an implementation method thereof, which are used for solving the technical problems of introducing disturbance to the filter transmission bands of a wide band mobile phone TV and the like. In the mobile phone TV terminal, physical parameters of an adjustable device in the adjustable bandpass filter can be changed by using an adjustable bandpass filter and by outputting a control signal corresponding to an effective TV program frequency band by a control unit, so that the centre frequency and the passband bandwidth of the adjustable bandpass filter can be changed to make the centre frequency and the passband bandwidth of the adjustable bandpass filter consistent with the centre frequency and the bandwidth of the TV program frequency band and make the adjustable bandpass filter only output narrowband TV signals corresponding to the TV program frequency band. The mobile phone TV terminal and the implementation method improve receiving SNR of a mobile phone TV, enhance the quality of receiving signals and improve the receiving performance of the mobile phone TV.

The invention discloses a single-pixel photon counting spread spectrum compression depth imaging method, which comprises the following steps: S1, sending, by a pseudo-random code generator, based on a programmable logic device, a pseudo-random code to drive a vertical surface laser to emit a light beam; s2, generating a random matrix, and loading the generated random matrix to a digital light projection chip through an electric signal; s3, enabling the light beam emitted by the vertical surface laser to reach the target and receiving, by the receiving system, the returned light beam; s4, acquiring a photon arrival time point value through a single-photon detector and a photon time arrival recorder within a certain integral time; s5, obtaining a measurement vector through an optimal correlation detection method; s6, reconstructing a depth image of the target through a sparse programming inversion method. The problem of range ambiguity of current single-pixel imaging is solved, the receiving signal-to-noise ratio of single-pixel imaging is improved and the modulation frequency is reduced by utilizing an optimal correlation detection method, so that the measurement matrix dimension is reduced, the data storage redundancy is reduced, and the imaging efficiency is improved.

The invention provides a pulse ultra wide band direction finding method based on PDOA. The method comprises the following steps: receiving an ultra wide band radio frequency signal transmitted by a UWB tag by using a double-antenna double-channel ultra wide band radio frequency receiver; using a local ultra-wideband lead pulse matched filter to obtain a discrete multipath channel impulse response estimation result; constructing a time domain mask, and setting multipath energy in the baseband complex signal to zero; fourier transform is carried out on the two sets of baseband time domain complex signals only containing first-diameter pulses, and amplitude values of frequency points in bandwidths of the two sets of baseband frequency domain complex signals are obtained; performing cross-correlation processing on the two groups of baseband frequency domain complex signals, and calculating a phase difference to obtain a normalized phase difference sequence; obtaining the phase difference of the ultra-wideband radio frequency signal arriving at the two antenna ports; and the arrival incident angle of the UWB radio frequency signal emitted by the UWB tag is calculated. According to the pulse ultra-wideband direction finding method based on the PDOA provided by the invention, high-precision space direction finding is realized under a complex multi-path channel by only using two antennas.