64 results about "Reference antenna" patented technology

The invention discloses a phase-free antenna measurement method, a phase-free antenna measurement system and a storage medium. The phase-free antenna measurement method comprises the following steps: constructing a measurement system comprising an antenna to be measured, a measurement probe, a fixed auxiliary reference antenna and software defined radio; the probe is controlled to move and sample on the scanning plane, and the SDR synchronously collects receiving signals of the probe and the reference antenna; based on the frequency domain transformation result of the two paths of signals, the radiation field amplitude of each sampling point and the relative phase relative to the reference antenna are directly calculated through non-iterative operation, so that complete complex electric field distribution on the scanning plane is reconstructed; and finally, obtaining a far-field directional diagram through near-field-far-field transformation. The fixed reference antenna is introduced to serve as a phase reference, synchronous acquisition and direct calculation are achieved in combination with the SDR, the antenna radiation field can be rapidly and accurately recovered without direct phase measurement or complex iteration in the single scanning plane and single scanning process, and the method has the advantages of being simple in system, high in measurement efficiency and high in signal drift resistance.

Apparatuses and methods for calibration reporting. A method performed by a UE includes receiving information about a CSI report. The information indicates NTRP>1 downlink reference signals (DL RSs), an associated sounding reference signal (SRS) resource in an SRS resource set from Nset≥1 SRS resource sets, and PSRS≥1 reference antenna ports from x SRS ports of the associated SRS resource. The method further includes transmitting, based on the information, the associated SRS using the PSRS reference antenna ports, receiving, based on the information, the NTRP DL RSs using the PSRS reference antenna ports for calibration-related measurement, determining, based on the information and the calibration-related measurement, calibration-related information (CLI), and transmitting the CSI report including the CLI.

The invention discloses a method and system for calibrating relative signal time delay of a link of a deep space large-aperture antenna, and the method comprises the steps: building a coordinate system based on a to-be-calibrated antenna and a reference antenna, and determining a signal phase difference caused by the spatial path difference between the to-be-calibrated antenna and the reference antenna in an antenna array and a satellite; obtaining a downlink signal relative phase difference and an uplink signal relative phase difference of the antenna to be calibrated relative to the reference antenna in the antenna array based on a signal phase difference caused by a space path difference between the antenna to be calibrated and the satellite and between the reference antenna and the satellite; obtaining a relative signal time delay value of a link of the antenna; and according to the relative signal time delay value of the own link of the antenna, compensating the own link of the antenna to be calibrated so as to realize the signal time delay of the own uplink and downlink of each antenna of the calibration array. The method is simple and reliable, and signal delay calibration of an uplink and a downlink of a deep-space large-aperture antenna can be conveniently realized.

Apparatuses and methods for channel state information (CSI) reporting in multi-transmission reception point (TRP) operations in wireless networks. A method performed by a user equipment (UE) includes receiving information about a CSI report associated with Ntrp groups of antenna ports, where Ntrp>1 and, based on the information, determining the CSI report associated with N≤Ntrp groups of antenna ports, where N∈{2, 3, . . . , Ntrp}. The CSI report includes a first indicator indicating, for each layer l=1, . . . , v, indices of Mv vectors including columns of a frequency-domain (FD) basis matrix Wf,l, where v≥1 is a rank value and a second indicator indicating an index of a FD offset value φr for each of the N groups of antenna ports, where r∈{1, . . . , N}, r≠r* and r* is an index of a reference group of antenna ports. The method further includes transmitting the CSI report including the first and the second indicators.

The present disclosure relates to a communication technique for converging IoT technology with a 5G communication system for supporting a higher data transmission rate beyond a 4G system, and a system therefor. The present disclosure may be applied to an intelligent service (for example, a smart home, a smart building, a smart city, a smart car or connected car, health care, digital education, retail business, a security and safety-related service, etc.) on the basis of 5G communication technology and IoT-related technology. In addition, the present disclosure relates to a method and device for carrying out cooperative communication in a wireless communication system. A method of a terminal of a communication system, according to one embodiment of the present disclosure, comprises the steps of: receiving, from a base station associated with a first cell, cell configuration information including a TCI configuration and a QCL configuration; checking a QCL reference antenna port on the basis of the cell configuration information; and receiving a signal from the base station on the basis of a QCL relationship with the checked QCL reference antenna port, wherein the QCL reference antenna port may be checked on the basis of a CSI-RS or SSB associated with a second cell.

The invention discloses a method for calibrating an antenna array downlink by using a plurality of satellites, and the method comprises the steps: receiving a beacon signal transmitted by each satellite in a time-sharing manner through each antenna in an antenna array, and calculating a relative signal phase difference caused by the difference of the downlink of an antenna to be calibrated relative to a reference antenna; the relative signal phase difference caused by the difference of the downlink of the antenna to be calibrated relative to the reference antenna is obtained; fitting a linear equation through a least square method according to a relative signal phase difference brought by a difference between each antenna to be calibrated in an antenna array corresponding to a plurality of on-orbit satellites and a downlink of a reference antenna; and obtaining the relative delay inequality of each to-be-calibrated antenna in the antenna array relative to the reference antenna after downlink calibration and the relative phase difference of each to-be-calibrated antenna after downlink calibration. The method is simple, reliable and convenient to implement.

The invention relates to a GNSS array antenna-based phase multi-path real-time correction method and system. The method comprises the following steps of: constructing a spatial correlation array antenna system; based on an array antenna system, calculating geometric position relations of other antenna units relative to a reference antenna unit, forming single-difference carrier phase residual observation values of different antenna units and the reference antenna unit, and constructing a carrier phase multipath error parameter estimation model; based on a carrier phase multi-path error parameter estimation model, jointly processing a multi-frequency GNSS observation value by using the consistency and frequency correlation of propagation paths of frequency points of a multi-frequency GNSS signal, and establishing a multi-frequency multi-path error redundancy estimation model; based on the multi-frequency multi-path error redundancy estimation model and particle filtering, performing nonlinear estimation on parameters of the carrier phase multi-path error parameter estimation model to obtain multi-path error parameters; and obtaining a carrier phase multipath error value of each frequency point by using the multipath error parameter, and correcting the error value in real time in GNSS positioning calculation.

The invention discloses an uplink channel signal time delay calibration method and system adopting a far field calibration system. The method comprises the steps that an uplink channel calibration unit generates an uplink channel calibration reference signal and an uplink channel calibration modulation signal and sends the uplink channel calibration reference signal and the uplink channel calibration modulation signal to a reference antenna and an antenna to be calibrated respectively; the reference antenna and the antenna to be calibrated send the received signals to a far-field calibration system; the far-field calibration system converts the received signal into a downlink signal and sends the downlink signal to the uplink channel calibration unit; the uplink channel calibration modulation signal demodulates the received signal into a signal envelope, and according to the signal envelope, a phase difference caused by the difference of the uplink channel of the to-be-calibrated antenna relative to the reference antenna is obtained; and selecting different uplink frequency points to calibrate the uplink channel relative phase difference of the to-be-calibrated antenna relative to the reference antenna to obtain the signal relative delay inequality of the to-be-calibrated antenna relative to the uplink channel of the reference antenna. According to the invention, the time delay calibration precision of the uplink channel of the antenna is improved.

The invention provides an air interface wire rapid calibration method and system, and solves the problems of high execution complexity and difficulty in engineering application caused by the adoption of space violent search in the existing air interface wire calibration technology. The method comprises the following steps: synchronously starting a static calibration antenna and a reference antenna fixedly connected with a rotary table under a plurality of rotation angles of the rotary table, and acquiring measurement data from measured equipment; determining a phase difference data set and a relative amplitude data set according to the measurement data; reconstructing a plurality of air interface transmission matrixes in a digital domain based on the data set, and screening out at least one calibration antenna spatial position combination by taking a matrix condition number as an index; and air interface wire calibration is completed according to the combination. According to the invention, the calibration complexity is reduced from a combination order to a linear order, the hardware cost and the measurement time are significantly reduced, the high-efficiency and high-precision calibration of large-scale terminals such as a whole vehicle is realized, and the method has wide applicability irrelevant to frequency.

The invention discloses a photoelectric sensor system conversion efficiency calibration system and method based on a reverberation chamber, and belongs to the technical field of photoelectric sensor conversion efficiency calibration, the system comprises an electric wave reverberation chamber, a transmitting antenna, a reference antenna and a photoelectric field sensor system; the photoelectric field sensor system is composed of a photoelectric sensor, a laser source, a photoelectric detector, a polarization maintaining optical fiber and a single-mode optical fiber. In the calibration process, the reference antenna and the photoelectric sensor system are used as receiving ends respectively, receiving power at different stirring positions in the reverberation chamber is sampled to obtain two groups of transfer functions, and the total efficiency of the photoelectric sensor system is determined by comparing the two groups of transfer functions under the condition that the radiation efficiency of the reference antenna is known. The conversion efficiency of the photoelectric sensor system is obtained by combining the relation among the power, the field intensity and the total efficiency in the free space; and the effective averaging of the incident direction and the polarization state is realized by using the uniform and isotropic electromagnetic field characteristics of the reverberation chamber.

A method includes: accessing a ranging signal transmitted from a transmitter and received at a set of antenna elements via a channel; recording time domain samples representing the ranging signal; accessing steering matrices characterized by a time delay grid, a phase angle grid, and distances between antenna elements and a reference antenna element; generating a structured data representation of the time domain samples characterized by the steering matrices; calculating a sparse representation of the channel by executing Li-norm regularization based on the structured data representation; and calculating a time of arrival estimate and an angle of arrival estimate for the ranging signal based on the sparse representation of the channel.

There is provided a first device comprising means for: transmitting, to a second device, information indicative of a geometry of a plurality of non-planar antennas of the first device; determining at least two reference antennas of the plurality of non-planar antennas based on information indicating a geometry of the plurality of non-planar antennas; and transmitting the reference signal to the second device via the determined at least two reference antennas without transmitting the reference signal via the remainder of the plurality of non-planar antennas.

The present application relates to a kind of separation identification and monitoring method and system of radiation background noise, in separation identification and monitoring method, background noise and equipment emission signal are synchronously collected by multiple fixed reference antennas and main antenna, and time synchronization is realized by central synchronous unit.First, based on spectrum comparison, background noise probability is calculated, and first grade is filtered out;Second, baseline model is established according to reference antenna data, abnormal signal is identified and its source is judged, and burst background noise and equipment real emission are distinguished;Second grade is filtered out by using pre-stored feature library for matching identification;Finally, the comparison result of real emission signal and background noise after filtering is displayed on test interface, and the data exceeding the standard is automatically marked, test margin is calculated and conclusion is generated.Compared with prior art, the present application can effectively solve the technical problem that background noise and equipment signal are difficult to separate in real time and accurately in complex electromagnetic environment, and the reliability and efficiency of radiation test are significantly improved.

The invention discloses an antenna simulation efficiency compensation design method and device, equipment and a storage medium, and relates to the technical field of simulation testing. The method comprises the following steps: acquiring a theoretical difference value between simulation efficiency of a standard reference antenna constructed by an antenna to be designed in simulation software and a microwave anechoic chamber; according to the radio frequency matching circuit structure of the antenna to be designed and the coaxial line parameters, theoretical loss parameters are obtained through calculation; constructing a simulation model of a to-be-designed antenna, and obtaining theoretical radiation efficiency according to the simulation model; and calculating the antenna simulation radiation efficiency according to the obtained theoretical difference value, the theoretical loss parameter and the theoretical radiation efficiency. Theoretical calculation and compensation are carried out on variables related to simulation and real objects, the difference between simulation efficiency and actual efficiency is made up, and more accurate antenna performance evaluation is achieved.

The invention relates to an electromagnetic logging technology, and discloses a while-drilling forward focusing electromagnetic logging method, which comprises the following two stages: (1) a pre-testing stage: a magnetic ring antenna array linearly arranged along a drill collar is utilized, an antenna at the rearmost end is used as a reference antenna to transmit a signal, and a front preorder antenna simultaneously receives the signal, and the amplitude and the phase delay of the received signal of each preorder antenna are synchronously obtained. (2) forward focusing stage: configuring transmitting parameters for the preorder antennas, setting the initial phase of each preorder antenna as a negative value of measured phase delay, and calculating an inversely proportional weight coefficient according to the receiving amplitude so as to configure the driving amplitude of each preorder antenna; and finally, driving the reference antenna and the configured preorder antenna to synchronously transmit, performing coherent superposition in front of the drill bit to form a focused wave beam, and weakening signal interference of lateral and backward stratums of the instrument at the same time. Equipment does not need to be preset in an undrilled stratum, the method is completely compatible with an existing instrument, and the signal strength and the signal-to-noise ratio of forward detection can be remarkably improved.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Apparatuses and methods for reporting for calibration. A method performed by a UE is includes receiving, from a base station, information on a channel state information (CSI) report, the information indicating antenna groups; determining a reference antenna group based on the information; determining calibration-related information (CLI) related to the antenna groups; and transmitting, to the base station, the CSI report including a CLI indicator indicating the reference antenna group and the CLI.

The application discloses a dynamic hybrid beam tracking system for satellite communication. The system divides the beam tracking into three operation modes according to the current reference antenna steering in the memory, the antenna steering updated by the mechanical three-axis transmission shaft, the satellite incoming path direction relative to the antenna main shaft direction of the user terminal, the received signal strength indicator and the predefined antenna field of view. The three operation modes include: the first mode, using coarse beams to realize large range tracking at a low sampling rate; the second mode, using fine beams to realize medium range tracking at the same low sampling rate; and the third mode, using fine beams to realize small range tracking at a high sampling rate. The system can realize accurate and adaptive beam alignment to improve the satellite communication efficiency.

This invention relates to electromagnetic logging technology and discloses a forward-focusing electromagnetic logging method while drilling, comprising two stages: (1) Pre-testing stage: using a magnetic ring antenna array arranged in a straight line along the drill collar, the last antenna is used as a reference antenna to transmit signals, and the preceding antennas simultaneously receive them, so as to synchronously acquire the amplitude and phase delay of the received signals of each preceding antenna. (2) Forward focusing stage: configuring the transmission parameters for the preceding antennas, setting their initial phase to the negative value of the measured phase delay, and calculating an inversely proportional weighting coefficient based on the received amplitude, thereby configuring the driving amplitude of each preceding antenna; finally, driving the reference antenna and the configured preceding antennas to transmit synchronously, and coherently superimposing them in front of the drill bit to form a focused beam, while weakening the signal interference from the instrument's sides and back to the formation. This invention does not require pre-setting equipment in un-drilled formations, is fully compatible with existing instruments, and can significantly improve the signal strength and signal-to-noise ratio of forward detection.

The invention discloses an accurate attitude determination method and system based on GNSS multi-antenna multi-frequency ambiguity step-by-step solution, and the method comprises the steps: firstly calculating the coordinates of a reference antenna in an ECEF coordinate system through employing a reference antenna observation value, and then calculating a rotation matrix from the ECEF coordinate system to a navigation coordinate system at the reference antenna; constructing a double-difference pseudo-range and carrier phase observation equation between the reference antenna and each auxiliary antenna on the carrier according to GNSS multi-antenna multi-frequency observation data, constructing a wide-lane carrier phase observation equation according to the double-difference pseudo-range and carrier phase observation equation, and obtaining double-difference wide-lane ambiguity of each baseline; according to the GNSS multi-antenna multi-frequency attitude determination method, the function of performing high-precision attitude determination according to step-by-step calculation according to the GNSS multi-antenna multi-frequency ambiguity and by adopting a mode of combining a direct method and a least square method is realized, and the GNSS multi-frequency attitude determination calculation efficiency is improved by utilizing the advantage that the ambiguity of the multi-frequency combination observation value is easy to fix, so that the GNSS multi-frequency observation value is reasonably utilized, and the GNSS multi-antenna multi-frequency attitude determination accuracy is improved. And the attitude calculation precision is also improved.

Method for determining the antenna gain of an antenna (21) to be tested in free space, wherein the method comprises the following steps: Acquisition of measurement results of a transmitted power of a measurement signal (24a, 24b) transmitted between a reference antenna (22) and an antenna to be tested (21); Determining an input reflection factor ( P e _ TP e _ R ) | P g _ R = 0 the antenna (21) to be tested and an input reflection factor ( P g _ TP g _ R ) | P e _ R = 0 the reference antenna (22); Detecting polarization losses based on an angle between the unit vector of the electric field vector (p̂) T ) the antenna (21) to be tested and the electric field vector (p̂ R ) the reference antenna (22); where the detection takes place in the frequency domain; Converting the recorded measurement results into the time domain; Applying a time domain filter (26) to the measurement results converted into the time domain, wherein a filter width of the time domain filter (26) is determined as a function of a spatial distance (r) between the reference antenna (22) and the antenna (21) to be tested, so that measurement result components (24b) resulting from multipath propagation of the measurement signal (24a, 24b) between the reference antenna (22) and the antenna (21) to be tested are reduced or removed; Converting the filtered measurement results into the frequency domain; and Determining the antenna gain G T (ϑ, φ) of the antenna (21) to be tested, taking into account the recorded input reflection factors and polarization losses, based on the filtered measurement results available in the frequency domain using the following equation: GT ( ϑ , ϕ ) = 10 log 10 ( P _ TP g _ R ) − 20 log 10 ( λ 4 π r ) − GREF ( ϑ , φ ) − ( 10 log ( 1 − ( P _ TP g _ R ) | P g _ R = 0 ) + 10 log ( 1 − ( P g _ TP g _ R ) |. P _ R = 0 ) + 20 log |

An arrangement for determining a characteristic of a plurality of antennas, the arrangement comprising: a plurality of field probes, each field probe having a transmitter for sending information about an amplitude of an electric field existing at the respective field probe; a test antenna; a reference antenna with a predetermined radiation pattern; at least one signal source connected to the test antenna and the reference antenna and configured to supply mutually coherent signals to the test antenna and the reference antenna; a device for determining phase information of the electric field existing at the respective field probe by means of interference of a first signal emitted by the test antenna with a second signal emitted by the reference antenna having the same frequency as the first signal;and a phase shifter designed to shift the phase of the emitted second signal, thereby changing the interference pattern.

The invention discloses a pose measurement method, device and equipment of a target antenna and a storage medium, and the method comprises the steps: obtaining the pose data of the target antenna, and collecting the satellite navigation observation values of the target antenna and a reference antenna, including a satellite navigation message, a pseudo range and a carrier phase; and carrying out pseudorange difference on the pseudoranges of the two observation values, and calculating an initial positioning result through a least square method in combination with satellite orbit information. And carrying out carrier phase difference on the carrier phase, processing the carrier phase difference and satellite orbit information through an ambiguity search algorithm, solving integer ambiguity, and further calculating a target positioning result. And finally, analyzing the positioning result into longitude and latitude, altitude and azimuth angle, and fusing with the attitude data to obtain the pose information of the target antenna. Through a mode of acquiring the satellite navigation observation value, related parameters of the antenna can be remotely and accurately measured in various complex environments, the accuracy and reliability of measurement are greatly improved, and the problem of inaccurate antenna parameters caused by measurement errors is reduced.

This disclosure provides an antenna testing system and method, relating to the field of antenna technology. The testing system includes a voltage loading device, the output of which is connected to the input of a phased array antenna; a field testing system for testing the antenna parameters of the phased array antenna; and a computer device, the output of which is connected to the voltage loading device, and the input of which is connected to the field testing system. In real-time mode, this disclosure allows for the pre-testing of the target loading voltage corresponding to the phased array antenna when its performance most closely approximates the reference antenna parameters during beam radiation. Since the tested target loading voltage is obtained through actual testing using the field testing system, the accuracy of the tested target loading voltage is guaranteed, thus ensuring the antenna performance of the phased array antenna in subsequent use.

The invention relates to the technical field of wireless sensing, and discloses an RFID (Radio Frequency Identification Device) pose estimation non-line-of-sight shielding influence suppression method based on antenna weight, which comprises the following steps of: S1, constructing a relation model of a label position and a non-line-of-sight shielding error; s2, distributing antenna weights according to the theoretical phase difference and the actual phase difference between each antenna and the reference antenna; s3, constructing an augmented Lagrangian convex optimization algorithm according to the relation model in the S1 and the antenna weight in the S2, and finally obtaining label position information by continuously iteratively inhibiting the influence of non-line-of-sight shielding; and S4, in combination with an antenna weight and a multi-signal classification algorithm, label attitude information is obtained through peak detection. By constructing a relation model of a label position and a non-line-of-sight occlusion error, the error size is quantified instead of being simply regarded as environmental noise; in addition, through an adaptive antenna weight distribution mechanism based on phase residual statistical analysis, the shielding condition of the antenna is automatically identified, and the corresponding weight is reduced.

The application relates to the technical field of communication, and particularly discloses a kind of angle of arrival measurement method and system suitable for low-cost receiver, the low-cost receiver has multiple radio frequency front ends and its shared analog-to-digital converter (ADC) and digital signal processor, wherein each radio frequency front end is connected with a corresponding antenna, the method comprises the following steps: receiving the signal of remote device through n antennas simultaneously, obtaining a reference antenna;Obtain the mixed signal of the jth antenna and the reference antenna, determine the phase of the mixed signal;Calculate the phase difference between the signal received by the reference antenna and the signal received by the jth antenna, generate a phase difference set;Determine the angle of arrival (AOA) of the signal sent by the remote device based on the phase difference set and the distance information between the n antennas.The application realizes low-power and low-cost AOA measurement, and reduces the cost of positioning.

The invention discloses an OBU positioning device and positioning method based on dual receiving channels. The device comprises: an array antenna for receiving a radio frequency signal sent by an on-board unit (OBU); a selection switch for controlling the connection relationship between each optional antenna unit and a public down-conversion receiving device; a local oscillator signal source for generating a local synchronization signal; a reference down-conversion receiving device for mixing the radio frequency signal received by the reference antenna unit with the local synchronization signal, and performing orthogonal transformation to complete down-conversion processing to obtain a first digital sequence of an I / Q combined baseband signal; a public down-conversion receiving device for obtaining a second digital sequence of the I / Q combined baseband signal; and a positioning device for determining a normalized mutual correlation matrix of two channels when each optional antenna unit is connected, determining an autocorrelation matrix of the array antenna based on the normalized mutual correlation matrix of the two channels when each optional antenna unit is connected, and positioning the OBU based on the autocorrelation matrix.

The present application relates to the technical field of communications, and provides a communication method, an apparatus and a system. The method comprises: a terminal sends on a first resource a first reference signal, the first resource comprising a first port, the first port being associated with a first antenna port, and the first reference signal being used to estimate a channel of the first port; and the terminal sends a first factor to a network device, the first factor being used to compensate the estimated channel of the first port, and the first factor being determined at least by means of receiving gains corresponding to the first antenna port and a reference antenna port. The network device can compensate an uplink channel of the first port on the basis of the receiving gains of the first antenna port and the reference antenna port, so that the network device can estimate a downlink channel more accurately on the basis of the uplink channel, thereby alleviating the problem of non-reciprocity between the uplink channel and the downlink channel, improving the downlink precoding performance based on the uplink channel, and ensuring the receiving performance of the downlink shared channel of the terminal.

A passive radar system, which comprises the following elements: a reference antenna ARI having a polarization preferably aligned with one of the polarizations of an illuminator, directed at a source of a reference signal, in particular a telephony base station of 4G- / 5G- or next standard, a reference antenna AR2 having an orthogonal polarization to ARI, preferably aligned with the other of the polarizations of the illuminator, orthogonal to the polarization of ARI, directed at the source of the reference signal, at least one observation antenna AO1 having a polarization preferably aligned with that of ARI, directed at an area of observation in which there are moving objects, preferably at least one observation antenna AO2 having an orthogonal polarization to that of AO1, preferably aligned with AR2 (orthogonal to ARI), directed at the area of observation in which there are moving objects, a radio receiving channel (TO) equipped with filters and amplifiers of signals coming from each of the antennas, a device for digitizing and processing signals (DPS) for the purpose of detecting or imaging the moving objects, wherein the radio receiving channel (TO) is connected to the device for digitizing signals (DPS), wherein the device for digitizing and processing signals consists of a digitizer (DI), a polarimetric adaptive filter (PF A), and a correlator system (UK), connected to each other.

The invention provides an antenna phase center calibration method and system, a terminal and a readable storage medium. The method comprises the following steps: collecting carrier phase observation data corresponding to a to-be-tested antenna and a reference antenna; calculating a non-geometric distance combination observation value of the to-be-measured antenna and a non-geometric distance combination observation value of the reference antenna; subtracting the non-geometric distance combination observation value of the to-be-measured antenna at the corresponding frequency from the non-geometric distance combination observation value of the reference antenna to obtain an initial difference combination observation value, obtaining a non-cycle-slip difference combination observation value in combination with a preset cycle slip threshold, and constructing a target difference combination observation value; fitting a phase center change model corresponding to the to-be-tested antenna based on the target differential combination observation value and a preset satellite; and calibrating the phase center of a to-be-tested antenna based on the phase center change model. The antenna phase center calibration is completed by eliminating external error interference and fitting the phase center change model, and the antenna phase calibration accuracy is improved.

The application provides a phase difference estimation method, device and equipment under low signal-to-noise ratio. A first signal received by a reference antenna unit and a second signal received by a second antenna unit in a phase difference estimation system are acquired; signal parameter estimation and signal construction are performed according to a main lobe signal received by a preset platform to obtain a constructed signal; the first signal and the second signal are down-converted and filtered according to an estimated frequency of the main lobe signal to obtain a first processing signal corresponding to the first signal and a second processing signal corresponding to the second signal; cross-correlation operation is performed according to the first processing signal, the second processing signal and the constructed signal to obtain a first cross-correlation accumulation function of the first processing signal and the constructed signal and a second cross-correlation accumulation function of the second processing signal and the constructed signal; and a phase difference estimation value is obtained according to the first cross-correlation accumulation function and the second cross-correlation accumulation function. The application has the beneficial effect of improving phase measurement precision under low signal-to-noise ratio.