CN111740789A - Signal calibration system and method - Google Patents
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Abstract
The invention relates to the technical field of calibration, in particular to a signal calibration system and a signal calibration method. Wherein the signal calibration system comprises: the calibration antenna is arranged in the shielding space; the signal scanning unit is connected with the calibration antenna; the signal scanning unit is used for controlling the calibration antenna to scan the target antenna unit and sending a first signal to be calibrated obtained by scanning to the compensation unit; the compensation unit is connected with the signal scanning unit; the compensation unit is used for calibrating a product to be calibrated based on the first signal to be calibrated. And acquiring and analyzing the first signal to be calibrated, including acquiring and analyzing error data of the target antenna unit. The method and the device can be used for acquiring the antenna errors and calibrating the product to be calibrated according to the acquired data, thereby reducing the errors generated when the communication system carries out beam forming, and improving the coverage precision of the communication system and the strength of signal transmission.
Description
Technical Field
The invention relates to the technical field of calibration, in particular to a signal calibration system and a signal calibration method.
Background
The antenna is a key device of a modern wireless communication system and is widely applied to wireless communication base stations and various communication terminals. In the 5G era, the importance of antennas was particularly prominent. In many cases, the coverage strength and area of the whole base station system are determined by key indexes such as antenna gain and waveform. Therefore, in order to adapt to different coverage scenarios, it is necessary to perform beamforming on the antenna, for example, generate a broadcast beam after beamforming, cover the entire 120-degree sector, or generate multiple service beams, and cover for a specific user.
Specifically, before performing beamforming, the base station needs to calibrate the entire system, to ensure that the amplitude and phase of each channel are equal, and then can apply a specific weight to each channel to generate a corresponding beam shape.
However, due to the design of the antenna itself and the constraint of the antenna characteristics in the communication product (signal crosstalk is easily generated with other signals), a signal acquisition point cannot be arranged on the antenna. Therefore, it is common in the prior art to place the signal acquisition point close to the antenna. In this case, the error of the antenna cannot be collected, which results in a larger forming error of the communication system and poor coverage.
Disclosure of Invention
In view of this, embodiments of the present invention provide a signal calibration system and method to solve the problem in the prior art that an error is generated when a communication system performs beamforming due to an error of an antenna being unable to be collected, so that a coverage accuracy of the communication system is low.
According to a first aspect, an embodiment of the present invention provides a signal calibration system, including:
the calibration antenna is arranged in the shielding space; the calibration antenna is used for acquiring a first signal to be calibrated, which is sent by a target antenna unit of a product to be calibrated; the product to be calibrated is arranged in the shielding space; the first signal to be calibrated comprises an amplitude-phase signal;
the signal scanning unit is connected with the calibration antenna; the signal scanning unit is used for controlling the calibration antenna to scan the target antenna unit and sending the first signal to be calibrated obtained by scanning to the compensation unit;
the compensation unit is connected with the signal scanning unit; the compensation unit is used for calibrating the product to be calibrated based on the first signal to be calibrated.
According to the signal calibration system provided by the embodiment of the invention, the product to be calibrated and the calibration antenna are arranged in the shielding space, and the calibration antenna is used for receiving the first signal to be calibrated sent by the target antenna unit of the product to be calibrated. And finally, the first signal to be calibrated after data processing is sent to the compensation unit for calibration.
And transmitting and receiving the first signal to be calibrated by using the target antenna unit and the calibration antenna, so that the first signal to be calibrated passes through the target antenna unit of the product to be calibrated. The first signal to be calibrated passing through the target antenna unit carries error data of the target antenna unit in the product to be calibrated. Therefore, the acquisition and analysis of the first signal to be calibrated include the acquisition and analysis of the error data of the target antenna unit. The method and the device can be used for acquiring the antenna errors and calibrating the product to be calibrated according to the acquired data, thereby reducing the errors generated when the communication system carries out beam forming, and improving the coverage precision of the communication system and the strength of signal transmission.
With reference to the first aspect, in a first implementation manner of the first aspect, the signal scanning unit further stores temperature drift information, and the signal scanning unit is further configured to send the temperature drift information to the compensation unit.
According to the signal calibration system provided by the embodiment of the invention, the temperature drift information is stored in the signal scanning unit, so that the influence of environmental materials and other factors on a product to be calibrated or error data which may be generated can be considered while the antenna error data is acquired, and the accuracy of a calibration result can be ensured and the identification precision of a communication system and the strength of signal transmission can be ensured by compensating or calibrating error parameters.
With reference to the first aspect, in a second implementation manner of the first aspect, the compensation unit stores therein temperature drift information sent by the signal scanning unit, and the compensation unit is configured to calibrate the product to be calibrated based on the first signal to be calibrated, the temperature drift information, and a second signal to be calibrated, where the second signal to be calibrated is a signal to be calibrated, where the signal acquisition unit is configured to acquire a module selected from the product to be calibrated.
According to the signal calibration system provided by the embodiment of the invention, the temperature drift information is stored in the compensation unit, so that after the received signal to be calibrated is obtained, the compensation calibration of error data of the whole product to be calibrated, which is caused by the environmental temperature, can be ensured, and the calibration precision of the product to be calibrated can be further ensured. So that the calibrated product can obtain better coverage effect.
In combination with the first aspect or the first implementation manner of the first aspect or the second implementation manner of the first aspect, in a third implementation manner of the first aspect, the system further includes:
the signal acquisition units are connected with the compensation unit; the signal acquisition unit is used for acquiring a signal to be calibrated of a selection module in the product to be calibrated, wherein the signal to be calibrated is a second signal to be calibrated, and the second signal to be calibrated comprises an amplitude-phase signal;
the compensation unit is used for calibrating the product to be calibrated based on the first signal to be calibrated and the second signal to be calibrated.
According to the signal calibration system provided by the embodiment of the invention, the plurality of signal acquisition units are arranged to acquire the second signal to be calibrated, and the signal to be calibrated of the target antenna unit is obtained by calculating the difference value between the second calibration signal and the first signal to be calibrated, so that the parameter of the target antenna unit is calibrated, and the signal calibration system can be more flexible.
With reference to the third implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the target antenna unit comprises an array of target antenna units; wherein the signal scanning unit includes:
the moving mechanism is connected with the calibration antenna; the moving mechanism is configured to drive the calibration antenna to scan each antenna unit in the target antenna unit array, so as to obtain the first signal to be calibrated corresponding to each antenna unit.
The signal calibration system provided by the embodiment of the invention is provided with the moving mechanism, the calibration antenna is driven to move by the moving mechanism, and the first signal to be calibrated in each antenna unit in the target antenna unit array is correspondingly scanned, so that a more flexible signal measurement system can be ensured.
With reference to the fourth implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the calibration antenna is a calibration antenna array; wherein each antenna element in the calibration antenna array corresponds to each antenna element in the target antenna element array.
According to the signal calibration system provided by the embodiment of the invention, the target antenna unit and the calibration antenna are set to be antenna arrays, so that one-to-one test can be carried out, and the calibration efficiency of the signal calibration system is optimized.
With reference to the first aspect, the first implementation manner of the first aspect, or the second implementation manner of the first aspect, in a sixth implementation manner of the first aspect, the target antenna unit is an antenna-filter integrated device, and the compensation unit is a signal processing system in the product to be calibrated.
According to the signal calibration system provided by the embodiment of the invention, the target antenna unit is set as the antenna filter integrated device so as to reduce the problem that the quality of a product is seriously influenced by the change of signal parameters caused by the disassembly and assembly adjustment of the antenna and the filter.
According to a second aspect, an embodiment of the present invention provides a signal calibration method, including:
receiving a first signal to be calibrated sent by a signal scanning unit; the signal scanning unit is connected with the calibration antenna and used for controlling the calibration antenna to scan a target antenna unit of a product to be calibrated so as to obtain the first signal to be calibrated; the calibration antenna is arranged in the shielding space; the product to be calibrated is arranged in the shielding space; the first signal to be calibrated comprises an amplitude-phase signal;
and calibrating the product to be calibrated based on the first signal to be calibrated.
The signal calibration method provided by the embodiment of the invention utilizes the calibration antenna and the target antenna unit to carry out signal transmission, and sends the first calibration signal of the target antenna unit passing through the product to be calibrated to the compensation unit for compensation, so that the parameter of the antenna can be calibrated, the antenna parameter calibration can be realized under the condition of not changing the circuit structure, the design cost of the product can be ensured, the signal to be calibrated of the product antenna can be obtained under the condition of not changing the hardware structure of the product, and the product calibration can be carried out according to the signal to be calibrated, so that the stability of the product is ensured, and the precision of a communication system is improved.
With reference to the second aspect, in a first embodiment of the second aspect, the calibrating the product to be calibrated based on the first signal to be calibrated includes:
receiving temperature drift information sent by the signal scanning unit;
and calibrating the product to be calibrated based on the temperature drift information and the first signal to be calibrated.
According to the signal calibration method provided by the embodiment of the invention, by increasing the temperature drift information and considering the error data generated by the ambient environment and material factors on the calibration product, the calibration precision of the product is further improved, the product can be ensured to adapt to different environments, and the application range of the product is further improved.
With reference to the second aspect or the first implementation manner of the second aspect, in a second implementation manner of the second aspect, the calibrating the product to be calibrated based on the first signal to be calibrated further includes:
receiving a second signal to be calibrated sent by the signal acquisition unit; the signal acquisition unit is used for acquiring a second signal to be calibrated of the selection module in the product to be calibrated, and the second signal to be calibrated comprises an amplitude-phase signal;
and calibrating the product to be calibrated based on the first signal to be calibrated and the second signal to be calibrated.
The signal calibration method provided by the embodiment of the invention calibrates the calibration product by combining the first signal to be calibrated and the second signal to be calibrated, namely, the product to be calibrated is divided into two parts to be calibrated to acquire the calibration signal, and then the parameter calibration is carried out on the product to be calibrated according to the acquired calibration signal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a signal calibration system according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a signal calibration system according to embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a calibration system in an exemplary 5G base station provided in embodiment 2 of the present invention;
fig. 4 is a flowchart of a signal calibration method according to embodiment 3 of the present invention.
Reference numerals:
10-calibrating the antenna; 20-a shielded space; 30-a product to be calibrated; 30(a) -a target antenna element; 30(b) -a compensation unit; 30(c) -a signal acquisition unit; 30(d) -a selection module; 40-a signal scanning unit; 50-moving mechanism.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The present embodiment provides a signal calibration system, as shown in fig. 1, including:
a calibration antenna 10 disposed within the shielded space 20; the calibration antenna 10 is used for acquiring a first signal to be calibrated, which is emitted by a target antenna unit 30(a) of a product 30 to be calibrated; the product 30 to be calibrated is arranged in the shielded space 20; the first signal to be calibrated comprises an amplitude-phase signal.
The calibration antenna 10 may be an antenna probe, and the target antenna unit 30(a) is disposed in the shielded space 20, so as to ensure signal integrity of the antenna during signal transmission.
A signal scanning unit 40 connected to the calibration antenna 10; the signal scanning unit 40 is configured to control the calibration antenna 10 to scan the target antenna unit 30(a), and send a first signal to be calibrated obtained by scanning to the compensation unit 30 (b). The signal scanning unit 40 may be a magnitude-phase scanning device, and is configured to receive a magnitude-phase signal of the first signal to be calibrated.
The signal scanning unit 40 is arranged in the signal calibration system, so that the antenna error which cannot be obtained in the product 30 to be calibrated through a traditional calibration mode can be obtained, and the identification precision of the communication system and the signal transmission strength are further optimized when the product 30 to be calibrated is calibrated and compensated.
A compensation unit 30(b) connected to the signal scanning unit 40 and the target antenna unit 30 (a); the compensation unit 30(b) is configured to calibrate the target antenna unit 30(a) based on the first signal to be calibrated.
Optionally, a wave-absorbing material is disposed in the shielding space 20 to reduce interference signals and ensure integrity of signal transmission between the target antenna unit 30(a) and the calibration antenna 10. Wherein the product 30 to be calibrated may be a base station.
Optionally, a target antenna unit 30(a) and a compensation unit 30(b) are disposed in the product 30 to be calibrated, wherein the target antenna unit 30(a) is connected to the compensation unit 30(b), and a selection module may be disposed, through which the target antenna unit 30(a) is connected to the compensation unit 30 (b).
Alternatively, the target antenna element 30(a) may be an array of target antenna elements. When the target antenna unit 30(a) is a target antenna unit array, it is ensured that signals emitted from the product can be transmitted in multiple angles and directions, thereby improving the performance of the product.
Optionally, the calibration antenna 10 may also be a calibration antenna array, and a switch matrix is installed between the calibration antenna array and the signal scanning unit 40, so as to implement one-to-one control to receive the first signal to be calibrated, so as to improve the working efficiency of the signal calibration system.
Alternatively, the signal scanning unit 40 may be disposed outside the shielded space 20. The first signal to be calibrated is acquired by the calibration antenna 10 and transmitted to the signal scanning unit 40 in a wired/wireless connection manner. The signal scanning unit 40 sends the acquired first signal to be calibrated to the compensation unit 30(b) in the product 30 to be calibrated; the compensation unit 30(b) in the product 30 to be calibrated calibrates the target antenna unit 30(a) according to the first signal to be calibrated transmitted by the signal scanning unit 40.
Alternatively, the signal scanning unit 40 may control whether the calibration antenna 10 receives the first signal to be calibrated. Specifically, a control switch is added between the signal scanning unit 40 and the calibration antenna 10 to control the receiving state of the first signal to be calibrated by the signal scanning unit 40, so as to flexibly control the signal calibration system.
Alternatively, the signal scanning unit 40 is disposed outside the shielding space 20, and the signal scanning unit 40 may display the amplitude-phase variation of the first signal to be calibrated.
Optionally, the compensation unit 30(b) may be a baseband unit and a digital intermediate frequency unit, and is configured to process signal data that needs signal compensation or adjustment, so as to ensure that the product 30 to be calibrated can operate in a working mode during design. For example: the base station can be ensured to work in a temperature range of-40 ℃ to 85 ℃, and the signal transmitting and receiving intensity can not be weakened. The baseband unit and the digital intermediate frequency unit may be formed by discrete circuits or integrated circuits. Preferably, the integrated circuit is used for building the integrated circuit, so that parameter errors generated by element adjustment among elements can be reduced.
In the present embodiment, the calibration antenna 10 receives a first signal to be calibrated, which is emitted by the product 30 to be calibrated. Wherein the first signal to be calibrated is transmitted by the product 30 to be calibrated through the target antenna unit 30(a) of the product 30 to be calibrated. Therefore, the first signal to be calibrated includes error information in the product 30 to be calibrated. The signal compensation is performed based on the received first signal to be calibrated, so that the product 30 to be calibrated can be compensated, and the antenna parameters in the product 30 to be calibrated can be compensated.
The signal to be calibrated is received and transmitted by the target antenna unit 30(a) and the calibration antenna 10, and the signal to be calibrated passes through the target antenna unit 30(a) of the product 30 to be calibrated. And the signal to be calibrated passing through the target antenna unit 30(a) carries antenna error data, thereby realizing the acquisition and analysis of the antenna error and ensuring the identification precision of the communication system and the strength of signal transmission.
Example 2
The present embodiment provides a signal calibration system, as shown in fig. 2, including: calibration antenna 10, shielded space 20, product to be calibrated 30, signal scanning unit 40 and moving mechanism 50.
The calibration antenna 10, the shielding space 20 and the signal scanning unit 40 are the same as those in embodiment 1, and the product 30 to be calibrated includes a signal acquisition unit 30(c) and a selection module 30(d) except that the target antenna unit 30(a) and the compensation unit 30(b) are the same as those in embodiment 1.
In the present embodiment, the moving mechanism 50 is connected to the calibration antenna 10; the moving mechanism 50 is configured to drive the calibration antenna 10 to scan each antenna unit in the target antenna unit array to obtain a first signal to be calibrated corresponding to each antenna unit. The target antenna unit 30(a) transmits a first signal to be calibrated to the calibration antenna 10. Therefore, the calibration antenna 10 collects the first signal to be calibrated for the target antenna unit 30 (a).
Specifically, the calibration antenna 10 may be fixedly connected to the moving mechanism 50, and when the moving mechanism 50 moves, the calibration antenna 10 connected to the moving mechanism 50 also moves together. The moving position of the moving mechanism 50 can be manually adjusted or the moving mechanism 50 is connected to a driving device and preset position information to be adjusted on driving software, so that the moving mechanism 50 can move to a preset position, wherein the preset position can be the position information of each antenna unit in the corresponding target antenna unit array. For example: the position corresponding to the antenna in the target antenna unit may be an antenna in the target antenna unit specified by a single calibration antenna, or an antenna in the target antenna unit array corresponding to the calibration antenna array one to one.
A signal acquisition unit 30(c) connected to the compensation unit 30 (b); the signal acquisition unit 30(c) is configured to acquire a signal to be calibrated of the selection module 30(d) in the product 30 to be calibrated, where the signal to be calibrated is a second signal to be calibrated, and the second signal to be calibrated includes an amplitude-phase signal; the compensation unit 30(b) is configured to calibrate the product to be calibrated 30 based on the first signal to be calibrated and the second signal to be calibrated.
The signal acquisition unit 30(c) may be a coupling network, and the coupling network is configured to acquire signals of the selection module 30(d) that pass through a single or multiple transmission channels (including digital-to-analog converter, frequency converter, power amplifier, and the like), reception channels (including low-noise amplifier, frequency converter, analog-to-digital converter, and the like), and circulators, and send the signals to the compensation unit 30(b), so as to perform parameter compensation on the selection module 30 (d).
The selection module 30(d) may be a module including at least one transmitting channel (including digital-to-analog converter, frequency converter, power amplifier, etc.), at least one receiving channel (including low noise amplifier, frequency converter, analog-to-digital converter, etc.), and at least one circulator.
The signal acquisition unit 40 may be a coupling network for acquiring signals from the selection module 30(d), or may be a plurality of coupling networks, where a single coupling network of the plurality of coupling networks acquires signals passing through a single transmission channel, a single reception channel, and a single circulator; the signal acquisition unit 40 is used for acquiring the signal of the selection module 30(d), and the acquired parameter value is fed back to the compensation unit 30(b) for parameter compensation, so that the stability of the performance of the product is ensured.
In addition, in the present embodiment, the signal scanning unit 40 further stores temperature drift information, and the signal scanning unit 40 is further configured to send the temperature drift information to the compensation unit 30 (b).
By storing the temperature drift information in the signal scanning unit 40 in advance, the temperature drift information can be a simulation model of the simulation antenna or the product 30 to be calibrated changing with the temperature under different environments and using different materials, and the simulation model can be simulated by mathematical modeling software such as FLEXPDE to obtain the corresponding temperature drift information. The temperature drift information can also be a temperature drift meter combined by a plurality of groups of temperature drift data, so that the application range of the original calibration product can be expanded according to the temperature drift data, and the product can adapt to work in more environments.
For example: when the product is a base station, the base station of the product is already calibrated for the first time by using the signal calibration system provided by the embodiment when the product is shipped from the factory. In actual use, the parameters of the corresponding product may change due to environmental reasons, in which case the base station cannot be calibrated by using the signal scanning unit 40 and the calibration antenna 10. Therefore, when performing the initial calibration (with the signal scanning unit 40 and the calibration antenna 10), the compensation unit 30(b) in the base station will store the temperature drift information and the initial parameter table, which is used to provide the reference parameters for the calibration of the base station. When the actual base station works, the compensation unit 30(b) in the base station needs to perform temperature acquisition by presetting a temperature sensor in the signal acquisition unit 30(c), and needs to acquire a second signal to be calibrated of the signal acquisition unit 30 (c). And then the compensation unit 30(b) in the base station determines an error compensation value according to the obtained temperature information and the second calibration signal and based on the temperature drift information and the initial parameter table, and finally performs parameter compensation on the running base station according to the error compensation value, thereby realizing product calibration. The data acquisition of the signal acquisition unit 30(c) may be real-time acquisition or preset time acquisition. The base station data change is monitored in real time, so that the base station generating data errors can be calibrated and repaired in the first time, and the working precision of the base station and the signal transmission intensity of the base station are ensured.
Parameter errors possibly existing in the environment and materials/hardware are considered by increasing temperature drift information, and then the parameter errors are compensated, so that more accurate calibration signals can be obtained, and the accuracy and stability of signals transmitted by calibrated products are better.
Alternatively, the moving mechanism 50 drives the calibration antenna 10 to move toward the corresponding target antenna unit 30(a), wherein the moving mechanism 50 may be a screw or a slide.
Optionally, the target antenna unit 30(a) includes a target antenna unit array, and the calibration antenna 10 is a calibration antenna array; each antenna unit in the calibration antenna array corresponds to each antenna unit in the target antenna unit array, so that corresponding signal scanning and acquisition are realized. In this embodiment, a switch matrix may be further added between the calibration antenna 10 and the signal scanning unit 40, so as to implement one-to-one signal acquisition, and if the calibration antenna array needs to be acquired by using the target antenna unit array, the target antenna unit array also needs to be mapped to the calibration antenna array one by one. And the signal error generated due to the array reason is eliminated or counteracted by the wave-absorbing material, the shielding material or the signal interference elimination device, and then the product calibration is carried out, thereby ensuring the precision of signal transmission and improving the efficiency of product calibration.
Alternatively, the target antenna unit 30(a) is a filter-antenna integrated device or a device in which a filter and an antenna are combined. The compensation unit 30(b) may be a signal processing system in the product 30 to be calibrated. The target antenna unit 30(a) is set as a filter-antenna integrated device, so that the problem that the quality of a product is seriously influenced due to the change of signal parameters caused by the disassembly and assembly adjustment of an antenna and a filter can be solved.
Alternatively, the signal acquisition unit 30(c) may be provided in the product 30 to be calibrated in the form of a coupling circuit.
Optionally, a temperature sensor is disposed in the calibration antenna 10, and performs data acquisition on the temperatures of the antenna and the filter, and combines the acquired temperature data with a preset temperature drift model to obtain temperature drift information. Wherein, the temperature drift model is a model of amplitude-phase change obtained according to the change of the antenna and the filter along with the temperature change.
Optionally, the temperature drift information may be stored in the compensation unit 30(b), and the compensation unit 30(b) calibrates the product to be calibrated 30 based on the first signal to be calibrated, the temperature drift information, and the second signal to be calibrated, where the second signal to be calibrated is the signal to be calibrated, which is used by the signal acquisition unit 30(c) to acquire the selection module 30(d) in the product to be calibrated 30.
Another example is: as shown in fig. 3, the calibration system of embodiment 2 applied in a 5G base station specifically includes:
the signal calibration system first acquires the amplitude-phase difference of the selection module 30(d) by using the signal acquisition unit 30(c), and performs the first compensation by the compensation unit 30 (b).
The error of the target antenna element 30(a) in the product to be calibrated is then transmitted through the antenna. The moving mechanism is connected to the calibration antenna 10 and drives the calibration antenna 10 to move toward the corresponding target antenna unit 30 (a). When the position where the calibration antenna 10 is disposed corresponds to the target antenna unit 30(a) and the signal scanning unit 40 connected to the calibration antenna 10 detects the difference in amplitude, the signal scanning of the calibration antenna 10 is completed. The scanned/collected difference information is sent to the signal scanning unit 40, and the signal scanning unit 40 needs to add a prefabricated temperature drift model (the amplitude and phase of the filter and the antenna change with the temperature) after obtaining the amplitude and phase difference. Different amplitude and phase data of the selection module 30(d) are obtained to obtain a passive amplitude and phase table, and the passive amplitude and phase table can also be amplitude and phase data of different frequencies in the selection module 30 (d).
And finally, feeding back the passive amplitude-phase table and the temperature drift data to the compensation unit 30(b) together for second compensation. To complete the calibration process of the product 30 to be calibrated; this example operation may be considered as an initial calibration of the base station system.
The advantages of this example are: the calibration of a complete system channel covering the antenna can be realized, and the signal precision is higher; and the calibration is carried out under the condition of not changing a hardware circuit, so that the manufacturing cost of the high-precision PCB is reduced, and the product cost is not obviously improved.
Example 3
The present embodiment provides a signal calibration method, as shown in fig. 4, including:
and S1, receiving the first signal to be calibrated sent by the signal scanning unit.
And S2, calibrating the product to be calibrated based on the first signal to be calibrated.
And receiving the first signal to be calibrated sent by the signal scanning unit by a compensation unit in the product to be calibrated. The signal scanning unit is connected with the calibration antenna and used for controlling the calibration antenna to scan a target antenna unit of a product to be calibrated so as to obtain a first signal to be calibrated.
Alternatively, the first signal to be calibrated may be a parameter of the entire product to be calibrated obtained by calibrating the antenna. The parameters of the whole product to be calibrated are utilized to determine the error parameters of the corresponding antenna, so that the antenna parameters of the product to be calibrated can be measured.
Specifically, the calibration antenna and the product to be calibrated are both arranged in the shielding space; the first signal to be calibrated comprises an amplitude-phase signal.
The compensation unit calibrates a product to be calibrated based on a first signal to be calibrated sent by a signal scanning system, and specifically includes:
first, the temperature drift information sent by the signal scanning unit is received by the compensation unit.
And then, the compensation unit calibrates the product to be calibrated based on the temperature drift information and the first signal to be calibrated.
Specifically, based on the temperature drift information and the first signal to be calibrated, the product to be calibrated is calibrated, including:
superposing the temperature drift information on the first signal to be calibrated to obtain a total signal to be calibrated; comparing the standard signal stored in the compensation unit with the total signal to be calibrated to obtain an error value; and calibrating the product to be calibrated based on the error value.
Optionally, the compensation unit calibrates the product to be calibrated based on the temperature drift information and the first signal to be calibrated, which may also be:
firstly, a second signal to be calibrated sent by the signal acquisition unit is received. Wherein the second signal to be calibrated is an amplitude-phase signal.
And secondly, calibrating the product to be calibrated based on the first signal to be calibrated and the second signal to be calibrated.
Specifically, the product to be calibrated may be divided into two parts, one of which is the target antenna unit and the other of which is the selection module. The second signal to be calibrated corresponds to the selection module, and the first signal to be calibrated corresponds to the whole product to be calibrated. Then, the difference between the first signal to be calibrated and the second signal to be calibrated is the signal to be calibrated corresponding to the target antenna unit.
The compensation unit compares the standard signal corresponding to the target antenna unit stored by the compensation unit with the signal to be calibrated of the target antenna unit to obtain an error signal corresponding to the target antenna unit. The compensation unit may then compensate for the target antenna element.
Optionally, a passive amplitude and phase meter is arranged in the signal scanning system, and the passive amplitude and phase meter can be obtained through space field detection and acquired through a calibration antenna.
Optionally, the first signal to be calibrated includes a passive amplitude-phase table, where the passive amplitude-phase table may be a single amplitude-phase value or a table composed of a plurality of amplitude-phase data values.
Calibrating a calibration product based on a first signal to be calibrated and the second signal to be calibrated, namely dividing the product to be calibrated into two parts to acquire calibration signals, and calculating a difference value (namely error data of a target antenna unit) according to the acquired calibration signals. Therefore, product calibration is carried out according to the difference data, and the identification precision of the communication system and the signal transmission strength are improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A signal calibration system, comprising:
the calibration antenna is arranged in the shielding space; the calibration antenna is used for acquiring a first signal to be calibrated, which is sent by a target antenna unit of a product to be calibrated; the product to be calibrated is arranged in the shielding space; the first signal to be calibrated comprises an amplitude-phase signal;
the signal scanning unit is connected with the calibration antenna; the signal scanning unit is used for controlling the calibration antenna to scan the target antenna unit and sending the first signal to be calibrated obtained by scanning to the compensation unit;
the compensation unit is connected with the signal scanning unit; the compensation unit is used for calibrating the product to be calibrated based on the first signal to be calibrated.
2. The system of claim 1, wherein the signal scanning unit further stores temperature drift information therein, and the signal scanning unit is further configured to send the temperature drift information to the compensation unit.
3. The system according to claim 1, wherein the compensation unit stores therein temperature drift information sent by the signal scanning unit, and the compensation unit is configured to calibrate the product to be calibrated based on the first signal to be calibrated, the temperature drift information, and a second signal to be calibrated, where the second signal to be calibrated is a signal to be calibrated, which is used by the signal acquisition unit to acquire a selected module in the product to be calibrated.
4. The system according to any one of claims 1-3, further comprising:
the signal acquisition unit is connected with the compensation unit; the signal acquisition unit is used for acquiring a signal to be calibrated of a selection module in the product to be calibrated, wherein the signal to be calibrated is a second signal to be calibrated, and the second signal to be calibrated comprises an amplitude-phase signal;
the compensation unit is used for calibrating the product to be calibrated based on the first signal to be calibrated and the second signal to be calibrated.
5. The system of claim 4, wherein the target antenna element comprises an array of target antenna elements; wherein the signal scanning unit includes:
the moving mechanism is connected with the calibration antenna; the moving mechanism is configured to drive the calibration antenna to scan each antenna unit in the target antenna unit array, so as to obtain the first signal to be calibrated corresponding to each antenna unit.
6. The system of claim 5, wherein the calibration antenna is a calibration antenna array; wherein each antenna element in the calibration antenna array corresponds to each antenna element in the target antenna element array.
7. A system according to any of claims 1-3, characterized in that the target antenna unit is an antenna and filter, or an antenna filter integrated device, and the compensation unit is a signal processing system in the product to be calibrated.
8. A method of signal calibration, comprising:
receiving a first signal to be calibrated sent by a signal scanning unit; the signal scanning unit is connected with the calibration antenna and used for controlling the calibration antenna to scan a target antenna unit of a product to be calibrated so as to obtain the first signal to be calibrated; the calibration antenna is arranged in the shielding space; the product to be calibrated is arranged in the shielding space; the first signal to be calibrated comprises an amplitude-phase signal;
and calibrating the product to be calibrated based on the first signal to be calibrated.
9. The method according to claim 8, wherein calibrating the product to be calibrated based on the first signal to be calibrated comprises:
receiving temperature drift information sent by the signal scanning unit;
and calibrating the product to be calibrated based on the temperature drift information and the first signal to be calibrated.
10. The method according to claim 8 or 9, wherein calibrating the product to be calibrated based on the first signal to be calibrated further comprises:
receiving a second signal to be calibrated sent by the signal acquisition unit; the signal acquisition unit is used for acquiring a second signal to be calibrated of the selection module in the product to be calibrated, and the second signal to be calibrated comprises an amplitude-phase signal;
and calibrating the product to be calibrated based on the first signal to be calibrated and the second signal to be calibrated.
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