CN113671270A - Antenna testing system and method based on digital switch - Google Patents
Antenna testing system and method based on digital switch Download PDFInfo
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Abstract
The invention relates to an antenna test method based on a digital switch, which adopts signal multi-channel modulation, carries out signal modulation coding at a signal transmitting end, carries out signal demodulation decoding at a receiving end through multi-port transmission of an antenna to be tested to obtain amplitude and phase information corresponding to different channels, and finally obtains a test result of a multi-port antenna through data processing, thereby realizing the simultaneous test of the multi-port antenna. The technology is based on the traditional antenna test system, and adds a signal coding technology, thereby greatly improving the test efficiency of the multi-port antenna.
Description
Technical Field
The invention relates to an antenna test method, in particular to an antenna test system and method based on a digital switch, and belongs to the technical field of antenna measurement.
Background
The antenna test is an important means for checking the actual performance of the antenna, and has become an important and indispensable process in the antenna development process. With the continuous development of antennas, higher requirements are put forward on an antenna test system. For example, the advent of multi-port multi-beam antennas has brought about a new problem in antenna testing while greatly improving the transmission capability of the antennas. When the radiation characteristic is tested, each port needs to be tested, the time required by the traditional test method is several times longer than that required by a single-ended antenna test because each port needs to be tested each time, and the test time required by the traditional method is several months when the number of the ports reaches a certain number, so that the antenna development requirement cannot be met.
The advent of electronic switches in test systems has alleviated this conflict, but has also introduced new problems. If the dynamic range is reduced due to the switching difference loss, the probe position is deviated from the ideal grid due to the increase of the number of channels. The multi-channel receiver can address some of the testing requirements of such antennas, but can only address the testing requirements of the antenna receive mode.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the system and the method adopt a code division signal source to generate orthogonal code division modulated radio frequency signals, modulated signals of different codes are connected to different antenna ports to be tested and are simultaneously transmitted, a receiver at a receiving end collects the signals, test data of each port of the antenna are respectively obtained by demodulating, decoding and comparing the amplitudes of a test path and a reference path, and simultaneous test of the transmitting state of the multi-port antenna is realized.
The technical solution of the invention is as follows:
an antenna test system based on digital switch, the said antenna test system includes the code division signal source, receives the coupler, isolator, combiner, code division receiver, standard receiving antenna;
the code division signal source comprises a code sub generation module 1, code sub generation modules 2 and … …, a code sub generation module N, a baseband generation module 1, baseband generation modules 2 and … …, a baseband generation module N, a radio frequency modulation module 1, radio frequency modulation modules 2 and … … and a radio frequency modulation module N;
the code sub-generating module 1 is configured to generate a code sub-signal C1, and output the generated code sub-signal C1 to the baseband generating module 1; the baseband generating module 1 is configured to receive the code sub-signal C1 generated by the code sub-generating module 1, generate a baseband signal B1 according to the received code sub-signal C1, and finally output the generated baseband signal B1 to the radio frequency modulating module 1; the radio frequency modulation module 1 is configured to receive the baseband signal B1 generated by the baseband generation module 1, generate a radio frequency signal F1 according to the received baseband signal B1, and finally output the generated radio frequency signal F1 to the coupler 1; the coupler 1 is used for receiving a radio frequency signal F1 generated by the radio frequency modulation module 1, generating a signal path signal a1 with corresponding frequency and a reference path signal R1 with same frequency and same code according to the received radio frequency signal F1, finally outputting the generated signal path signal a1 with corresponding frequency to the antenna port 1 to be tested, and outputting the generated reference path signal R1 with same frequency and same code to the isolator 1; the isolator 1 is used for receiving the signal path signal a1 output by the coupler 1, isolating the received signal path signal a1 and outputting an isolated signal path signal a1 to the combiner; the antenna port 1 to be tested is used for receiving the signal path signal A1 generated by the coupler 1 and sending the received signal path signal A1 to the standard receiving antenna;
the radio frequency of the radio frequency signal F1 should meet the frequency band requirement of the antenna to be tested;
the working frequency of the coupler 1 is required to cover the frequency requirement of the antenna to be tested, and the coupling degree is not required;
the code sub-generating module 2 is configured to generate a code sub-signal C2, and output the generated code sub-signal C2 to the baseband generating module 2; the baseband generating module 2 is configured to receive the code sub-signal C2 generated by the code sub-generating module 2, generate a baseband signal B2 according to the received code sub-signal C2, and finally output the generated baseband signal B2 to the radio frequency modulating module 2; the radio frequency modulation module 2 is configured to receive the baseband signal B2 generated by the baseband generation module 2, generate a radio frequency signal F2 according to the received baseband signal B2, and finally output the generated radio frequency signal F2 to the coupler 2; the coupler 2 is used for receiving a radio frequency signal F2 generated by the radio frequency modulation module 2, generating a signal path signal a2 with a corresponding frequency and a reference path signal R2 with the same frequency and the same code according to the received radio frequency signal F2, finally outputting the generated signal path signal a2 with the corresponding frequency to the antenna port 2 to be tested, and outputting the generated reference path signal R2 with the same frequency and the same code to the isolator 2; the isolator 2 is configured to receive the signal path signal a2 output by the coupler 2, and output an isolated signal path signal a2 to the combiner after isolating the received signal path signal a 2; the antenna port 2 to be tested is used for receiving the signal path signal A2 generated by the coupler 2 and sending the received signal path signal A2 to the standard receiving antenna;
the radio frequency of the radio frequency signal F2 should meet the frequency band requirement of the antenna to be tested;
the working frequency of the coupler 2 is required to cover the frequency requirement of the antenna to be tested, and the coupling degree is not required;
……
the code sub-generating module N is used for generating a code sub-signal CN and outputting the generated code sub-signal CN to the baseband generating module N; the baseband generation module N is used for receiving the code sub-signal CN generated by the code sub-generation module N, generating a baseband signal BN according to the received code sub-signal CN and finally outputting the generated baseband signal BN to the radio frequency modulation module N; the radio frequency modulation module N is used for receiving the baseband signal BN generated by the baseband generation module N, generating a radio frequency signal FN according to the received baseband signal BN, and finally outputting the generated radio frequency signal FN to the coupler N; the coupler N is used for receiving a radio frequency signal FN generated by the radio frequency modulation module N, generating a signal path signal AN with corresponding frequency and a reference path signal RN with the same frequency and the same code according to the received radio frequency signal FN, finally outputting the generated signal path signal AN with the corresponding frequency to the port N of the antenna to be tested, and outputting the generated reference path signal RN with the same frequency and the same code to the isolator N; the isolator N is used for receiving the signal path signal AN output by the coupler N, isolating the received signal path signal AN and outputting the isolated signal path signal AN to the combiner; the antenna port N to be tested is used for receiving the signal path signal AN generated by the coupler N and sending the received signal path signal AN to the standard receiving antenna;
the radio frequency of the radio frequency signal FN should meet the requirement of the frequency band of the antenna to be tested;
the working frequency of the coupler N is required to cover the frequency of the antenna to be tested, and the coupling degree is not required;
the code sub-signal C1, the code sub-signals C2, … … and the code sub-signal CN are mutually orthogonal, and the code sub-signal C1, the code sub-signals C2, … … and the code sub-signal CN are various communication common orthogonal codes such as Walsh codes, Golden codes and the like;
the combiner is used for receiving a reference path signal R1 output by the isolator 1, reference path signals R2 and … … output by the isolator 2 and a reference path signal RN output by the isolator N, combining the received reference path signal R1, reference path signals R2 and … … and the reference path signal RN into one path, generating a reference path combined signal R and outputting the reference path combined signal R to the down-conversion module 1 in the code division receiver;
the working frequency of the combiner should cover the frequency requirement of the antenna to be measured;
the standard receiving antenna is used for receiving the signal path signal a1, the signal path signals a2, … … and the signal path signal AN, synthesizing the received signal path signal a1, the signal path signals a2, … … and the signal path signal AN into a signal path signal a and outputting the signal path signal a to the down-conversion module 2;
the coupler, the isolator and the combiner can be separated from the code division signal source or integrated in the code division signal source as an integrated design;
the code division receiver comprises a down-conversion module 1, a down-conversion module 2, an analog-to-digital conversion module 1, an analog-to-digital conversion module 2, a demodulation module 1, a demodulation module 2 and a data processing module;
the down-conversion module 1 is configured to receive the reference channel synthesized signal R output by the combiner, perform down-conversion on the received reference channel synthesized signal R, and output a down-converted signal RL to the analog-to-digital conversion module 1; the analog-to-digital conversion module 1 is used for receiving the down-converted signal RL output by the down-conversion module 1, performing analog-to-digital conversion on the received down-converted signal RL, and outputting a reference path digital signal RD to the demodulation module 1; the demodulation module 1 is configured to receive the reference path digital signal RD output by the analog-to-digital conversion module 1, demodulate the received reference path digital signal RD, and output reference path signals Ref1, Ref2, … …, and RefN to the data processing module;
the down-conversion module 2 is used for receiving a signal path signal A output by the standard receiving antenna, performing down-conversion on the received signal path signal A, and outputting a down-converted signal AL to the analog-to-digital conversion module 2; the analog-to-digital conversion module 2 is configured to receive a down-converted signal AL output by the down-conversion module 2, perform analog-to-digital conversion on the received down-converted signal AL, and output a reference path digital signal AD to the demodulation module 2; the demodulation module 2 is used for receiving the reference path digital signal AD output by the analog-to-digital conversion module 2, demodulating the received reference path digital signal AD, outputting test path signals S1 and S2 … … SN, and sending the test path signals S1 and S2 … … SN to the data processing module;
the data processing module will receive the reference path signals Ref1, Ref2, … …, RefN output by the demodulation module 1 and the signal path signals S1, S2 … … SN output by the demodulation module 2. And the data processing module performs amplitude-to-amplitude ratio processing on S1 and Ref1 to obtain amplitude and phase information of a directional diagram corresponding to the antenna port 1 to be measured. And the data processing module performs amplitude-to-amplitude ratio processing on S2 and Ref2 to obtain amplitude and phase information of a directional diagram corresponding to the antenna port 2 to be measured. … …, the data processing module performs amplitude-to-amplitude ratio processing on SN and RefN to obtain amplitude and phase information of a directional diagram corresponding to the antenna port N to be measured.
Mechanical equipment: the equipment supports the antenna to be tested and the standard receiving antenna corresponding to different antenna test sites, such as a far field, a compact field, a plane near field, a cylinder surface near field and a sphere surface near field, and enables the antenna to be tested and the standard receiving antenna to move mutually according to requirements.
An antenna test method based on a digital switch comprises the following steps:
(1) installing an antenna to be tested according to an antenna test method, and calibrating a field; and for the far field, the antenna to be tested and the standard receiving antenna are erected on the corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is larger than D, the spherical scanning motion of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
d1- -size of antenna aperture to be measured
d2- -standard receiving antenna caliber size
Lambda- -wavelength corresponding to the highest frequency within the test frequency
For compact range, the antenna to be tested and the standard receiving antenna are erected on corresponding mechanical equipment, the antenna to be tested is located in a compact range quiet zone, spherical scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
And for the plane near field, the antenna to be tested and the standard receiving antenna are placed on corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, the plane scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
For the cylindrical near field, the antenna to be tested and the standard receiving antenna are placed on the corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, the plane scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
For the spherical near field, the antenna to be tested and the standard receiving antenna are placed on corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, spherical scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
(2) According to the method, a link is built, the code division receiver is connected with the coupler, and the signal path output by the coupler is connected with a plurality of corresponding ports of the antenna to be tested. The reference path output by the coupler is connected with the isolator, the signal path signal output by the isolator is connected with the combiner, and the reference path signal output by the combiner is connected with the reference path of the code division receiver. The signal transmitted by the antenna to be tested is transmitted to the standard receiving antenna through space, is received by the standard receiving antenna and is then transmitted to the signal path of the code division receiver.
(3) And setting parameters of a code division signal source, such as orthogonal code sub-type, code length, code sub-quantity, radio frequency and other parameters. Taking Walsh codes as an example, the code sub-generation modules 1, 2, N generate mutually orthogonal Walsh code sub-blocks C1, C2 … … CN. The corresponding code sub information enters the corresponding baseband generation module to generate corresponding baseband signals B1, B2 … … BN.
Where i is the channel number.
Ci (t) -ith Walsh code.
A-base band signal amplitude, constant
Bi (t) -baseband signal
w0-baseband signal angular frequency
The baseband signals B1, B2 … … BN enter the rf modulation module, modulate to test the corresponding rf frequency and output rf signals F1, F2 … … FN.
Where i is the channel number.
Ci (t) -ith Walsh code.
A' i-amplitude of modulated signal
Fi (t) -modulated radio frequency Signal
HF-high pass filtering
wt + phi i-phase of modulated signal, varying periodically with time
w1-modulated signal angular frequency
w-modulated signal angular frequency, w ═ w0+w1
(4) And setting the scanning range and the testing distance of the mechanical device, carrying out mechanical motion and simultaneously carrying out signal source emission, and dividing the modulated radio-frequency signal into testing signals F1 and F2 … … FN and reference paths R1 and R2 … … RN through a coupler. The radio frequency signal is transmitted by the antenna to be tested, transmitted through space and then received by the standard receiving antenna to obtain a signal path signal A, and the signal path signal A enters the code division receiver. The reference path signal is synthesized into a reference path signal R through a combiner and enters the code division receiver.
ami-amplitude value added by antenna Properties to be measured
phi-phase value attached by the antenna property to be measured
(5) And after receiving the test signal A and the reference signal R, performing down-conversion, analog-to-digital conversion and demodulation to separate signals corresponding to different antenna ports to be tested.
Performing down-conversion low-pass processing:
LF-low pass filtering
The analog-to-digital conversion only changes the signal form, does not change the signal, and then carries out signal demodulation through demodulation, and can separate out each path of signal by utilizing the orthogonal property of a code sub:
ciam-constant after selected code-related demodulation
And the demodulated signal is subjected to amplitude comparison phase comparison processing of corresponding data in a receiver data processing module to obtain amplitude and phase information corresponding to a corresponding port of the antenna to be detected.
In the formula
Ami-amplitude information corresponding to the ith path port of the antenna to be tested
Phi-phase information corresponding to the ith path port of the antenna to be tested
(6) And (5) repeating the steps (3) to (5) to complete amplitude phase information of all corresponding mechanical positions. And according to the obtained data of each port, obtaining far-field directional patterns of different ports by utilizing data processing to finish the test. If the plane, cylinder and sphere tests are adopted, the near-far field is converted into the standard public technology in the antenna test, and the details are not repeated here. If far-field and compact fields are used, direct testing results in far-field patterns.
The multi-port antenna is operated in a transmitting state and is connected with a code division signal source, and the isolation of a transmitting channel of the code division source is more than or equal to 100 dB.
The code source generates multi-path orthogonal code spread spectrum modulated radio frequency signals, and the length of a spreading modulation code sub-code is greater than or equal to 32 orders.
Each path of the multi-path signals of the code division source needs to be divided into one path for synthesis to form a reference path radio frequency signal containing all code sub-signals, each path of the reference path is connected with an isolator, and the reverse isolation degree of the isolator is required to be more than 30 dB.
The code division receiver can simultaneously receive the reference path and the signal path for processing, and carries out correlation demodulation according to the known orthogonal codes of each path to distinguish the amplitude and the phase of the signals corresponding to different code subunits. And comparing the amplitude of the test path with the reference path to obtain the amplitude phase value
An antenna test method based on a digital switch comprises the following steps:
(1) installing an antenna to be tested according to an antenna test method, and calibrating a field; and for the far field, the antenna to be tested and the standard receiving antenna are erected on the corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is larger than D, the spherical scanning motion of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
d1- -size of antenna aperture to be measured
d2- -standard receiving antenna caliber size
Lambda- -wavelength corresponding to the highest frequency within the test frequency
For compact range, the antenna to be tested and the standard receiving antenna are erected on corresponding mechanical equipment, the antenna to be tested is located in a compact range quiet zone, spherical scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
And for the plane near field, the antenna to be tested and the standard receiving antenna are placed on corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, the plane scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
For the cylindrical near field, the antenna to be tested and the standard receiving antenna are placed on the corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, the plane scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
For the spherical near field, the antenna to be tested and the standard receiving antenna are placed on corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, spherical scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
(2) According to the method, a link is built, the code division receiver is connected with the coupler, and the signal path output by the coupler is connected with a plurality of corresponding ports of the antenna to be tested. The reference path output by the coupler is connected with the isolator, the signal path signal output by the isolator is connected with the combiner, and the reference path signal output by the combiner is connected with the reference path of the code division receiver. The signal transmitted by the antenna to be tested is transmitted to the standard receiving antenna through space, is received by the standard receiving antenna and is then transmitted to the signal path of the code division receiver.
(3) And setting parameters of a code division signal source, such as orthogonal code sub-type, code length, code sub-quantity, radio frequency and other parameters. Taking Walsh codes as an example, the code sub-generation modules 1, 2, N generate mutually orthogonal Walsh code sub-blocks C1, C2 … … CN. The corresponding code sub information enters the corresponding baseband generation module to generate corresponding baseband signals B1, B2 … … BN.
Where i is the channel number.
Ci (t) -ith Walsh code.
A-base band signal amplitude, constant
Bi (t) -baseband signal
w0-baseband signal angular frequency
The baseband signals B1, B2 … … BN enter the rf modulation module, modulate to test the corresponding rf frequency and output rf signals F1, F2 … … FN.
Where i is the channel number.
Ci (t) -ith Walsh code.
A' i-amplitude of modulated signal
Fi (t) -modulated radio frequency Signal
HF-high pass filtering
wt + phi i-phase of modulated signal, varying periodically with time
w1-modulated signal angular frequency
w-modulated signal angular frequency, w ═ w0+w1
(4) And setting the scanning range and the testing distance of the mechanical device, carrying out mechanical motion and simultaneously carrying out signal source emission, and dividing the modulated radio-frequency signal into testing signals F1 and F2 … … FN and reference paths R1 and R2 … … RN through a coupler. The radio frequency signal is transmitted by the antenna to be tested, transmitted through space and then received by the standard receiving antenna to obtain a signal path signal A, and the signal path signal A enters the code division receiver. The reference path signal is synthesized into a reference path signal R through a combiner and enters the code division receiver.
ami-amplitude value added by antenna Properties to be measured
phi-phase value attached by the antenna property to be measured
(5) And after receiving the test signal A and the reference signal R, performing down-conversion, analog-to-digital conversion and demodulation to separate signals corresponding to different antenna ports to be tested.
Performing down-conversion low-pass processing:
LF-low pass filtering
The analog-to-digital conversion only changes the signal form, does not change the signal, and then carries out signal demodulation through demodulation, and can separate out each path of signal by utilizing the orthogonal property of a code sub:
ciam-constant after selected code-related demodulation
And the demodulated signal is subjected to amplitude comparison phase comparison processing of corresponding data in a receiver data processing module to obtain amplitude and phase information corresponding to a corresponding port of the antenna to be detected.
In the formula
Ami-amplitude information corresponding to the ith path port of the antenna to be tested
Phi-phase information corresponding to the ith path port of the antenna to be tested
(6) And (5) repeating the steps (3) to (5) to complete amplitude phase information of all corresponding mechanical positions. And according to the obtained data of each port, obtaining far-field directional patterns of different ports by utilizing data processing to finish the test. If the plane, cylinder and sphere tests are adopted, the near-far field is converted into the standard public technology in the antenna test, and the details are not repeated here. If far-field and compact fields are used, direct testing results in far-field patterns.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts the code division modulation technology to realize the simultaneous transmission and the simultaneous reception of the multi-port antenna, and separates the respective test information of different ports, thereby greatly improving the test efficiency.
(2) Compared with the traditional switch time-sharing switching, the invention has no time problem caused by the traditional switch time-sharing switching and no dynamic range reduction problem caused by switch difference loss.
(3) Compared with a multi-channel receiver test method, the multi-channel multi-beam antenna test method is used for the transmitting mode of the multi-port multi-beam antenna. The method makes up the defects of the multi-channel receiver testing method.
(4) The invention relates to an antenna test method based on a digital switch, which adopts signal multi-channel modulation, carries out signal modulation coding at a signal transmitting end, carries out signal demodulation decoding at a receiving end through multi-port transmission of an antenna to be tested to obtain amplitude and phase information corresponding to different channels, and finally obtains a test result of a multi-port antenna through data processing, thereby realizing the simultaneous test of the multi-port antenna. The technology is based on the traditional antenna test system, and adds a signal coding technology, thereby greatly improving the test efficiency of the multi-port antenna.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is the pattern interference result data without the addition of a code;
fig. 3 shows the pattern test results in the case of orthogonal codes.
Detailed Description
The antenna of the present invention is described in detail below with reference to the accompanying drawings, in which:
first, system core composition
An antenna test system based on digital switch, the said antenna test system includes the code division signal source, receives the coupler, isolator, combiner, code division receiver, standard receiving antenna;
the code division signal source comprises a code sub generation module 1, code sub generation modules 2 and … …, a code sub generation module N, a baseband generation module 1, baseband generation modules 2 and … …, a baseband generation module N, a radio frequency modulation module 1, radio frequency modulation modules 2 and … … and a radio frequency modulation module N;
the code sub-generating module 1 is configured to generate a code sub-signal C1, and output the generated code sub-signal C1 to the baseband generating module 1; the baseband generating module 1 is configured to receive the code sub-signal C1 generated by the code sub-generating module 1, generate a baseband signal B1 according to the received code sub-signal C1, and finally output the generated baseband signal B1 to the radio frequency modulating module 1; the radio frequency modulation module 1 is configured to receive the baseband signal B1 generated by the baseband generation module 1, generate a radio frequency signal F1 according to the received baseband signal B1, and finally output the generated radio frequency signal F1 to the coupler 1; the coupler 1 is used for receiving a radio frequency signal F1 generated by the radio frequency modulation module 1, generating a signal path signal a1 with corresponding frequency and a reference path signal R1 with same frequency and same code according to the received radio frequency signal F1, finally outputting the generated signal path signal a1 with corresponding frequency to the antenna port 1 to be tested, and outputting the generated reference path signal R1 with same frequency and same code to the isolator 1; the isolator 1 is used for receiving the signal path signal a1 output by the coupler 1, isolating the received signal path signal a1 and outputting an isolated signal path signal a1 to the combiner; the antenna port 1 to be tested is used for receiving the signal path signal A1 generated by the coupler 1 and sending the received signal path signal A1 to the standard receiving antenna;
the radio frequency of the radio frequency signal F1 should meet the frequency band requirement of the antenna to be tested;
the working frequency of the coupler 1 is required to cover the frequency requirement of the antenna to be tested, and the coupling degree is not required;
the code sub-generating module 2 is configured to generate a code sub-signal C2, and output the generated code sub-signal C2 to the baseband generating module 2; the baseband generating module 2 is configured to receive the code sub-signal C2 generated by the code sub-generating module 2, generate a baseband signal B2 according to the received code sub-signal C2, and finally output the generated baseband signal B2 to the radio frequency modulating module 2; the radio frequency modulation module 2 is configured to receive the baseband signal B2 generated by the baseband generation module 2, generate a radio frequency signal F2 according to the received baseband signal B2, and finally output the generated radio frequency signal F2 to the coupler 2; the coupler 2 is used for receiving a radio frequency signal F2 generated by the radio frequency modulation module 2, generating a signal path signal a2 with a corresponding frequency and a reference path signal R2 with the same frequency and the same code according to the received radio frequency signal F2, finally outputting the generated signal path signal a2 with the corresponding frequency to the antenna port 2 to be tested, and outputting the generated reference path signal R2 with the same frequency and the same code to the isolator 2; the isolator 2 is configured to receive the signal path signal a2 output by the coupler 2, and output an isolated signal path signal a2 to the combiner after isolating the received signal path signal a 2; the antenna port 2 to be tested is used for receiving the signal path signal A2 generated by the coupler 2 and sending the received signal path signal A2 to the standard receiving antenna;
the radio frequency of the radio frequency signal F2 should meet the frequency band requirement of the antenna to be tested;
the working frequency of the coupler 2 is required to cover the frequency requirement of the antenna to be tested, and the coupling degree is not required;
……
the code sub-generating module N is used for generating a code sub-signal CN and outputting the generated code sub-signal CN to the baseband generating module N; the baseband generation module N is used for receiving the code sub-signal CN generated by the code sub-generation module N, generating a baseband signal BN according to the received code sub-signal CN and finally outputting the generated baseband signal BN to the radio frequency modulation module N; the radio frequency modulation module N is used for receiving the baseband signal BN generated by the baseband generation module N, generating a radio frequency signal FN according to the received baseband signal BN, and finally outputting the generated radio frequency signal FN to the coupler N; the coupler N is used for receiving a radio frequency signal FN generated by the radio frequency modulation module N, generating a signal path signal AN with corresponding frequency and a reference path signal RN with the same frequency and the same code according to the received radio frequency signal FN, finally outputting the generated signal path signal AN with the corresponding frequency to the port N of the antenna to be tested, and outputting the generated reference path signal RN with the same frequency and the same code to the isolator N; the isolator N is used for receiving the signal path signal AN output by the coupler N, isolating the received signal path signal AN and outputting the isolated signal path signal AN to the combiner; the antenna port N to be tested is used for receiving the signal path signal AN generated by the coupler N and sending the received signal path signal AN to the standard receiving antenna;
the radio frequency of the radio frequency signal FN should meet the requirement of the frequency band of the antenna to be tested;
the working frequency of the coupler N is required to cover the frequency of the antenna to be tested, and the coupling degree is not required;
the code sub-signal C1, the code sub-signals C2, … … and the code sub-signal CN are mutually orthogonal, and the code sub-signal C1, the code sub-signals C2, … … and the code sub-signal CN are various communication common orthogonal codes such as Walsh codes, Golden codes and the like;
the combiner is used for receiving a reference path signal R1 output by the isolator 1, reference path signals R2 and … … output by the isolator 2 and a reference path signal RN output by the isolator N, combining the received reference path signal R1, reference path signals R2 and … … and the reference path signal RN into one path, generating a reference path combined signal R and outputting the reference path combined signal R to the down-conversion module 1 in the code division receiver;
the working frequency of the combiner should cover the frequency requirement of the antenna to be measured;
the standard receiving antenna is used for receiving the signal path signal a1, the signal path signals a2, … … and the signal path signal AN, synthesizing the received signal path signal a1, the signal path signals a2, … … and the signal path signal AN into a signal path signal a and outputting the signal path signal a to the down-conversion module 2;
the coupler, the isolator and the combiner can be separated from the code division signal source or integrated in the code division signal source as an integrated design;
the code division receiver comprises a down-conversion module 1, a down-conversion module 2, an analog-to-digital conversion module 1, an analog-to-digital conversion module 2, a demodulation module 1, a demodulation module 2 and a data processing module;
the down-conversion module 1 is configured to receive the reference channel synthesized signal R output by the combiner, perform down-conversion on the received reference channel synthesized signal R, and output a down-converted signal RL to the analog-to-digital conversion module 1; the analog-to-digital conversion module 1 is used for receiving the down-converted signal RL output by the down-conversion module 1, performing analog-to-digital conversion on the received down-converted signal RL, and outputting a reference path digital signal RD to the demodulation module 1; the demodulation module 1 is configured to receive the reference path digital signal RD output by the analog-to-digital conversion module 1, demodulate the received reference path digital signal RD, and output reference path signals Ref1, Ref2, … …, and RefN to the data processing module;
the down-conversion module 2 is used for receiving a signal path signal A output by the standard receiving antenna, performing down-conversion on the received signal path signal A, and outputting a down-converted signal AL to the analog-to-digital conversion module 2; the analog-to-digital conversion module 2 is configured to receive a down-converted signal AL output by the down-conversion module 2, perform analog-to-digital conversion on the received down-converted signal AL, and output a reference path digital signal AD to the demodulation module 2; the demodulation module 2 is used for receiving the reference path digital signal AD output by the analog-to-digital conversion module 2, demodulating the received reference path digital signal AD, outputting test path signals S1 and S2 … … SN, and sending the test path signals S1 and S2 … … SN to the data processing module;
the data processing module will receive the reference path signals Ref1, Ref2, … …, RefN output by the demodulation module 1 and the signal path signals S1, S2 … … SN output by the demodulation module 2. And the data processing module performs amplitude-to-amplitude ratio processing on S1 and Ref1 to obtain amplitude and phase information of a directional diagram corresponding to the antenna port 1 to be measured. And the data processing module performs amplitude-to-amplitude ratio processing on S2 and Ref2 to obtain amplitude and phase information of a directional diagram corresponding to the antenna port 2 to be measured. … …, the data processing module performs amplitude-to-amplitude ratio processing on SN and RefN to obtain amplitude and phase information of a directional diagram corresponding to the antenna port N to be measured.
Mechanical equipment: the equipment supports the antenna to be tested and the standard receiving antenna corresponding to different antenna test sites, such as a far field, a compact field, a plane near field, a cylinder surface near field and a sphere surface near field, and enables the antenna to be tested and the standard receiving antenna to move mutually according to requirements.
Secondly, detailed steps of (1) mounting an antenna to be tested according to an antenna test method, and calibrating a field; and for the far field, the antenna to be tested and the standard receiving antenna are erected on the corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is larger than D, the spherical scanning motion of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
d1- -size of antenna aperture to be measured
d2- -standard receiving antenna caliber size
Lambda- -wavelength corresponding to the highest frequency within the test frequency
For compact range, the antenna to be tested and the standard receiving antenna are erected on corresponding mechanical equipment, the antenna to be tested is located in a compact range quiet zone, spherical scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
And for the plane near field, the antenna to be tested and the standard receiving antenna are placed on corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, the plane scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
For the cylindrical near field, the antenna to be tested and the standard receiving antenna are placed on the corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, the plane scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
For the spherical near field, the antenna to be tested and the standard receiving antenna are placed on corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, spherical scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested.
(2) According to the method, a link is built, the code division receiver is connected with the coupler, and the signal path output by the coupler is connected with a plurality of corresponding ports of the antenna to be tested. The reference path output by the coupler is connected with the isolator, the signal path signal output by the isolator is connected with the combiner, and the reference path signal output by the combiner is connected with the reference path of the code division receiver. The signal transmitted by the antenna to be tested is transmitted to the standard receiving antenna through space, is received by the standard receiving antenna and is then transmitted to the signal path of the code division receiver.
(3) And setting parameters of a code division signal source, such as orthogonal code sub-type, code length, code sub-quantity, radio frequency and other parameters. Taking Walsh codes as an example, the code sub-generation modules 1, 2, N generate mutually orthogonal Walsh code sub-blocks C1, C2 … … CN. The corresponding code sub information enters the corresponding baseband generation module to generate corresponding baseband signals B1, B2 … … BN.
Where i is the channel number.
Ci (t) -ith Walsh code.
A-base band signal amplitude, constant
Bi (t) -baseband signal
w0-baseband signal angular frequency
The baseband signals B1, B2 … … BN enter the rf modulation module, modulate to test the corresponding rf frequency and output rf signals F1, F2 … … FN.
Where i is the channel number.
Ci (t) -ith Walsh code.
A' i-amplitude of modulated signal
Fi (t) -modulated radio frequency Signal
HF-high pass filtering
wt + phi i-phase of modulated signal, varying periodically with time
w1-modulated signal angular frequency
w-modulated signal angular frequency, w ═ w0+w1
(4) And setting the scanning range and the testing distance of the mechanical device, carrying out mechanical motion and simultaneously carrying out signal source emission, and dividing the modulated radio-frequency signal into testing signals F1 and F2 … … FN and reference paths R1 and R2 … … RN through a coupler. The radio frequency signal is transmitted by the antenna to be tested, transmitted through space and then received by the standard receiving antenna to obtain a signal path signal A, and the signal path signal A enters the code division receiver. The reference path signal is synthesized into a reference path signal R through a combiner and enters the code division receiver.
ami-amplitude value added by antenna Properties to be measured
phi-phase value attached by the antenna property to be measured
(5) And after receiving the test signal A and the reference signal R, performing down-conversion, analog-to-digital conversion and demodulation to separate signals corresponding to different antenna ports to be tested.
Performing down-conversion low-pass processing:
LF-low pass filtering
The analog-to-digital conversion only changes the signal form, does not change the signal, and then carries out signal demodulation through demodulation, and can separate out each path of signal by utilizing the orthogonal property of a code sub:
ciam-constant after selected code-related demodulation
And the demodulated signal is subjected to amplitude comparison phase comparison processing of corresponding data in a receiver data processing module to obtain amplitude and phase information corresponding to a corresponding port of the antenna to be detected.
In the formula
Ami-amplitude information corresponding to the ith path port of the antenna to be tested
Phi-phase information corresponding to the ith path port of the antenna to be tested
(6) And (5) repeating the steps (3) to (5) to complete amplitude phase information of all corresponding mechanical positions. And according to the obtained data of each port, obtaining far-field directional patterns of different ports by utilizing data processing to finish the test. If the plane, cylinder and sphere tests are adopted, the near-far field is converted into the standard public technology in the antenna test, and the details are not repeated here. If far-field and compact fields are used, direct testing results in far-field patterns.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
And erecting the antennas to be detected with two ports in the near-field scanning area. According to the method, a link is built, two ports of the antenna are tested simultaneously, and as shown in fig. 2, the two paths of signals are completely superposed together and cannot be distinguished, and a correct test result cannot be obtained simultaneously. As shown in fig. 3, the results obtained by the two ports simultaneously tested by the method are shown, and it can be seen that the results obtained by the simultaneous testing by the method are completely consistent with the results obtained by the antenna individual testing, thereby verifying the effectiveness of the method.
Claims (10)
1. An antenna test system based on digital switch, its characterized in that: the antenna test system comprises a code division signal source, a receiving coupler, an isolator, a combiner, a code division receiver and a standard receiving antenna;
the code division signal source comprises a code sub generation module, a baseband generation module and a radio frequency modulation module;
the code sub-generating module is used for generating code sub-signals and outputting the generated code sub-signals to the baseband generating module; the base band generating module generates a base band signal according to the received code sub-signal, finally outputs the generated base band signal to the radio frequency modulation module, the radio frequency modulation module generates a radio frequency signal according to the received base band signal, and finally outputs the generated radio frequency signal to the coupler, the coupler generates a signal path signal with corresponding frequency and a reference path signal with the same frequency and code according to the received radio frequency signal, and finally outputs the generated signal path signal with corresponding frequency to an antenna port to be tested, and outputs the generated reference path signal with the same frequency and code to the isolator; the isolator isolates the received signal path signal and outputs the isolated signal path signal to the combiner; the port of the antenna to be tested sends the received signal path signal to a standard receiving antenna;
the combiner synthesizes the received reference path signal into a signal R and outputs the signal R to a down-conversion module 1 in the code division receiver;
the standard receiving antenna synthesizes the received signal path signals into a signal path signal A and outputs the signal path signal A to the down-conversion module 2;
the code division receiver comprises a down-conversion module 1, a down-conversion module 2, an analog-to-digital conversion module 1, an analog-to-digital conversion module 2, a demodulation module 1, a demodulation module 2 and a data processing module;
the down-conversion module 1 is configured to receive the reference channel synthesized signal R output by the combiner, perform down-conversion on the received reference channel synthesized signal R, and output a down-converted signal RL to the analog-to-digital conversion module 1; the analog-to-digital conversion module 1 is used for receiving the down-converted signal RL output by the down-conversion module 1, performing analog-to-digital conversion on the received down-converted signal RL, and outputting a reference path digital signal RD to the demodulation module 1; the demodulation module 1 is used for receiving the reference path digital signal RD output by the analog-to-digital conversion module 1, demodulating the received reference path digital signal RD and outputting a reference path signal to the data processing module;
the down-conversion module 2 is used for receiving a signal path signal A output by the standard receiving antenna, performing down-conversion on the received signal path signal A, and outputting a down-converted signal AL to the analog-to-digital conversion module 2; the analog-to-digital conversion module 2 is configured to receive a down-converted signal AL output by the down-conversion module 2, perform analog-to-digital conversion on the received down-converted signal AL, and output a reference path digital signal AD to the demodulation module 2; the demodulation module 2 is used for receiving the reference path digital signal AD output by the analog-to-digital conversion module 2, demodulating the received reference path digital signal AD, outputting a test path signal and sending the test path signal to the data processing module;
the data processing module receives the reference path signal output by the demodulation module 1 and the signal path signal output by the demodulation module 2, and the data processing module performs amplitude-to-phase ratio processing on the received data to obtain directional diagram amplitude and phase information corresponding to the port of the antenna to be detected.
2. The digital switch based antenna test system of claim 1, wherein:
the code division signal source comprises a code sub generation module 1, code sub generation modules 2 and … …, a code sub generation module N, a baseband generation module 1, baseband generation modules 2 and … …, a baseband generation module N, a radio frequency modulation module 1, radio frequency modulation modules 2 and … … and a radio frequency modulation module N;
the code sub-generating module 1 is configured to generate a code sub-signal C1, and output the generated code sub-signal C1 to the baseband generating module 1; the baseband generating module 1 is configured to receive the code sub-signal C1 generated by the code sub-generating module 1, generate a baseband signal B1 according to the received code sub-signal C1, and finally output the generated baseband signal B1 to the radio frequency modulating module 1; the radio frequency modulation module 1 is configured to receive the baseband signal B1 generated by the baseband generation module 1, generate a radio frequency signal F1 according to the received baseband signal B1, and finally output the generated radio frequency signal F1 to the coupler 1; the coupler 1 is used for receiving a radio frequency signal F1 generated by the radio frequency modulation module 1, generating a signal path signal a1 with corresponding frequency and a reference path signal R1 with same frequency and same code according to the received radio frequency signal F1, finally outputting the generated signal path signal a1 with corresponding frequency to the antenna port 1 to be tested, and outputting the generated reference path signal R1 with same frequency and same code to the isolator 1; the isolator 1 is used for receiving the signal path signal a1 output by the coupler 1, isolating the received signal path signal a1 and outputting an isolated signal path signal a1 to the combiner; the antenna port 1 to be tested is used for receiving the signal path signal A1 generated by the coupler 1 and sending the received signal path signal A1 to the standard receiving antenna;
the code sub-generating module 2 is configured to generate a code sub-signal C2, and output the generated code sub-signal C2 to the baseband generating module 2; the baseband generating module 2 is configured to receive the code sub-signal C2 generated by the code sub-generating module 2, generate a baseband signal B2 according to the received code sub-signal C2, and finally output the generated baseband signal B2 to the radio frequency modulating module 2; the radio frequency modulation module 2 is configured to receive the baseband signal B2 generated by the baseband generation module 2, generate a radio frequency signal F2 according to the received baseband signal B2, and finally output the generated radio frequency signal F2 to the coupler 2; the coupler 2 is used for receiving a radio frequency signal F2 generated by the radio frequency modulation module 2, generating a signal path signal a2 with a corresponding frequency and a reference path signal R2 with the same frequency and the same code according to the received radio frequency signal F2, finally outputting the generated signal path signal a2 with the corresponding frequency to the antenna port 2 to be tested, and outputting the generated reference path signal R2 with the same frequency and the same code to the isolator 2; the isolator 2 is configured to receive the signal path signal a2 output by the coupler 2, and output an isolated signal path signal a2 to the combiner after isolating the received signal path signal a 2; the antenna port 2 to be tested is used for receiving the signal path signal A2 generated by the coupler 2 and sending the received signal path signal A2 to the standard receiving antenna;
……
the code sub-generating module N is used for generating a code sub-signal CN and outputting the generated code sub-signal CN to the baseband generating module N; the baseband generation module N is used for receiving the code sub-signal CN generated by the code sub-generation module N, generating a baseband signal BN according to the received code sub-signal CN and finally outputting the generated baseband signal BN to the radio frequency modulation module N; the radio frequency modulation module N is used for receiving the baseband signal BN generated by the baseband generation module N, generating a radio frequency signal FN according to the received baseband signal BN, and finally outputting the generated radio frequency signal FN to the coupler N; the coupler N is used for receiving a radio frequency signal FN generated by the radio frequency modulation module N, generating a signal path signal AN with corresponding frequency and a reference path signal RN with the same frequency and the same code according to the received radio frequency signal FN, finally outputting the generated signal path signal AN with the corresponding frequency to the port N of the antenna to be tested, and outputting the generated reference path signal RN with the same frequency and the same code to the isolator N; the isolator N is used for receiving the signal path signal AN output by the coupler N, isolating the received signal path signal AN and outputting the isolated signal path signal AN to the combiner; the antenna port N to be tested is used for receiving the signal path signal AN generated by the coupler N and sending the received signal path signal AN to the standard receiving antenna.
3. The digital switch based antenna test system of claim 2, wherein:
the radio frequency of the radio frequency signals F1, 2 and N should meet the requirement of the frequency band of the antenna to be tested;
the working frequency of the couplers 1, 2 and N should cover the frequency requirement of the antenna to be tested, and the coupling degree does not make a requirement;
the working frequency of the combiner should cover the frequency requirement of the antenna to be measured;
the code sub-signal C1, the code sub-signals C2, … … and the code sub-signal CN are mutually orthogonal, and the code sub-signal C1, the code sub-signals C2, … … and the code sub-signal CN are Walsh codes and orthogonal codes commonly used for Golden code communication.
4. The digital switch based antenna test system of claim 1, wherein:
the antenna test system corresponds to different antenna test fields, a far field, a compact field, a plane near field, a cylinder near field and a sphere near field, supports an antenna to be tested and a standard receiving antenna, and enables the antenna to be tested and the standard receiving antenna to move mutually according to requirements.
5. An antenna test method based on a digital switch is characterized by comprising the following steps:
(1) installing an antenna to be tested and carrying out field calibration;
(2) setting parameters of a code division signal source, generating mutually orthogonal Walsh code subsets C1 and C2 … … CN according to code subset generating modules 1, 2 and N, enabling corresponding code subset information to enter a corresponding baseband generating module to generate corresponding baseband signals B1 and B2 … … BN, enabling the baseband signals B1 and B2 … … BN to enter a radio frequency modulation module, modulating the baseband signals B1 and B2 … … BN into corresponding radio frequency testing, and outputting radio frequency signals F1 and F2 … … FN;
(3) the radio frequency signal modulated by the modulation module is divided into test signals F1 and F2 … … FN and reference paths R1 and R2 … … RN through a coupler, the radio frequency signal is transmitted through an antenna to be tested, transmitted through space and received by a standard receiving antenna to obtain a signal path signal A, the signal path signal A enters a code division receiver, and the reference path signal is synthesized into a reference path signal R through a combiner and enters the code division receiver;
(4) and after receiving the test signal A and the reference signal R, performing down-conversion, analog-to-digital conversion, demodulation and separation on signals corresponding to different antenna ports to be tested, and performing amplitude-to-amplitude comparison processing on corresponding data on the demodulated signals in a receiver data processing module to obtain amplitude and phase information corresponding to the corresponding ports of the antennas to be tested.
6. The antenna testing method based on the digital switch as claimed in claim 5, wherein:
in the step (1), for a compact range, an antenna to be tested and a standard receiving antenna are erected on corresponding mechanical equipment, the antenna to be tested is located in a compact range quiet zone, spherical scanning movement of the standard receiving antenna around the antenna to be tested is completed in a test, and a scanning range and an interval are determined according to the requirement of the antenna to be tested;
for the plane near field, the antenna to be tested and the standard receiving antenna are placed on corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, the plane scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested;
for the cylindrical near field, the antenna to be tested and the standard receiving antenna are placed on corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, the plane scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested;
for the spherical near field, the antenna to be tested and the standard receiving antenna are placed on corresponding mechanical equipment, the distance between the antenna to be tested and the standard receiving antenna is between 3 lambda and D, spherical scanning movement of the standard receiving antenna around the antenna to be tested is completed in the test, and the scanning range and the scanning interval are determined according to the requirement of the antenna to be tested;
the distance D between the antenna to be measured and the standard receiving antenna during calibration is determined by the following formula:
d1- -the aperture of the antenna to be measured;
d2- -standard receiving antenna caliber size;
λ -the wavelength corresponding to the highest frequency within the test frequency.
7. The antenna testing method based on the digital switch as claimed in claim 5, wherein:
in step (2), the generation of corresponding baseband signals B1, B2 … … BN is determined by the following formula:
wherein i is channel number;
ci (t) -ith Walsh code;
a is the baseband signal amplitude, which is constant;
bi (t) -baseband signal;
w0-baseband signal angular frequency.
8. The digital switch-based antenna testing method according to claim 7, wherein:
in the step (2), the modulation is to test the corresponding radio frequency and output radio frequency signals F1 and F2 … … FN are determined by the following formula:
wherein i is channel number;
ci (t) -ith Walsh code;
a' i-modulated signal amplitude;
fi (t) -modulated radio frequency signal;
HF-high pass filtering;
wt + phi i-the phase of the modulated signal, varying with the time period;
w1-the modulated signal angular frequency;
w-modulated signal angular frequency, w ═ w0+w1。
9. The antenna testing method based on the digital switch as claimed in claim 5, wherein:
in the step (3), the step (c),
ami-amplitude value attached by the antenna property to be measured;
phi, the phase value attached by the antenna property to be measured;
in the step (4), the method for performing down-conversion low-pass processing comprises the following steps:
LF-low pass filtering
The analog-to-digital conversion only changes the signal form, does not change the signal, and then carries out signal demodulation through demodulation, and can separate out each path of signal by utilizing the orthogonal property of a code sub:
ciam-a constant after demodulation associated with the selected code.
10. The digital switch-based antenna testing method according to claim 9, wherein:
in the step (4), the amplitude-to-amplitude ratio phase processing is determined by the following formula:
in the formula
AmiAmplitude information corresponding to the ith path port of the antenna to be tested;
Phiand phase information corresponding to the ith path port of the antenna to be tested.
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