CN111193555A

CN111193555A - Multi-frequency concurrent intermodulation test system

Info

Publication number: CN111193555A
Application number: CN201910607989.5A
Authority: CN
Inventors: 喻国建; 封建华; 吴浩发; 张需溥; 韩伟; 石浩
Original assignee: Hangzhou Jointcom Communication Technology Co ltd
Current assignee: Hangzhou Jointcom Communication Technology Co ltd
Priority date: 2019-07-08
Filing date: 2019-07-08
Publication date: 2020-05-22
Anticipated expiration: 2039-07-08
Also published as: CN111193555B

Abstract

The invention discloses a multi-frequency concurrent intermodulation test system, which comprises a main control computer and a test module, wherein the test module comprises: the test hosts are communicated with the main control computer and execute the command of the main control computer; the power amplification modules are connected with the test host and amplify the initial frequency signals; the intermodulation testers are connected with the test host and used for connecting the tested piece; each test host is connected with at least one intermodulation tester. The system is controlled by the master control computer, and the multi-band intermodulation test is realized by connecting the plurality of test hosts with the plurality of intermodulation testers, so that the test cost is saved, and the test efficiency is improved. The substantial effects of the invention include: the multi-frequency intermodulation test is supported, meanwhile, closed-loop feedback is used during testing, test data are adjusted in real time, the precision is improved, connection control among a plurality of devices is achieved through a plurality of switches, the intermodulation test process is simplified, the test efficiency is improved, and the test cost is reduced.

Description

Multi-frequency concurrent intermodulation test system

Technical Field

The invention relates to the technical field of testing of passive devices, in particular to a multi-frequency concurrent intermodulation testing system.

Background

With the development of mobile communication base stations towards multi-band and multi-port directions, passive intermodulation testing becomes a bottleneck for restricting the improvement of the testing efficiency of antennas or multi-port devices, and one solution for improving the testing efficiency is to change the traditional serial testing method into parallel testing (concurrent testing),

the invention of the authorization notice number CN106301607B discloses a testing device and a testing method for passive intermodulation of a modulation signal; the device comprises a control module, a signal generation module, a data transceiving module and a processing module; the first method mode is as follows: 1, setting test signal parameters and a first mode; 2 generating test signals with different frequencies; 3 selecting a transmission PIM test or a reflection PIM test; 4 testing a transmission PIM signal or a reflection PIM signal; the second mode is as follows: a, setting test signal parameters and a mode II; b, generating test signals with different frequencies and sending a useful signal; c, receiving a useful signal and a passive intermodulation interference signal and performing down-conversion and low-pass filtering processing; setting the frequency and bandwidth of a test signal, and determining the passive intermodulation order to be tested; and the D processing module calculates two index evaluations of the error rate and the frame error rate and sends the obtained data information to the output unit.

The prior art has the problem of low multi-band intermodulation test efficiency, and the deployment and maintenance efficiency of the communication base station is restricted to a certain degree.

Disclosure of Invention

Aiming at the problem of low multi-band intermodulation test efficiency in the prior art, the invention provides a multi-band concurrent intermodulation test system, which is controlled by a master control computer to run, realizes multi-band intermodulation test by connecting a plurality of test hosts with a plurality of intermodulation testers, saves test cost and improves test efficiency.

The technical scheme of the invention is as follows.

A multi-frequency concurrent intermodulation test system comprises a main control computer and a test module, wherein the test module comprises: the test hosts are communicated with the main control computer and execute the command of the main control computer; the power amplification modules are connected with the test host and amplify the initial frequency signals; the intermodulation testers are connected with the test host and used for connecting the tested piece; each test host is connected with at least one intermodulation tester. The system is controlled by the master control computer, and the multi-band intermodulation test is realized by connecting the plurality of test hosts with the plurality of intermodulation testers, so that the test cost is saved, and the test efficiency is improved.

Preferably, the test host includes: the industrial personal computer is communicated with the main control computer and controls the test host; the broadband signal source channel is connected with the industrial personal computer and the power amplification module; the switch module is controlled by the industrial personal computer and is connected with the power amplification module and the intermodulation tester; the USB power meter is connected with the industrial personal computer and is connected with the intermodulation tester through the switch module; and the receiver is connected with the industrial personal computer and is connected with the intermodulation tester through the switch module. The broadband signal source channel comprises a coupler, an isolator and other universal devices and is used for transmitting a frequency signal from the industrial personal computer to the power amplifier module, the USB power meter is used for acquiring a signal fed back from the intermodulation tester and transmitting the signal to the industrial personal computer, and the industrial personal computer adjusts an output signal of the broadband signal source channel to form closed loop feedback so as to improve the testing accuracy. The receiver is used for receiving PIM signals generated by intermodulation test.

Preferably, the intermodulation tester comprises: the driving module controls the intermodulation tester and is in communication connection with the test host; the signal source processing module is connected with the test host; the interface module is connected with the signal source processing module and comprises a plurality of duplexers and a test interface used for connecting a piece to be tested; the power divider is connected with the signal source processing module and the test host; and the self-checking module is connected with the test host and the interface module. The signal source processing module receives a frequency signal from the test host, the power divider collects the frequency signal fed back by the signal source processing module and returns the frequency signal to the test host, and the self-checking module is used for transmitting the processed intermodulation signal to the test host.

Preferably, the signal source processing module includes two couplers, two isolators, a 3dB electrical bridge and a first selection switch, the couplers receive signals from the test host and are connected to the isolators and the power divider, the isolators are connected to the 3dB electrical bridge, the 3dB electrical bridge is connected to a main contact of the first selection switch, and a branch contact of the first selection switch is connected to the duplexer of the interface module.

Preferably, the self-checking module includes a plurality of voltage-controlled oscillators and a second selection switch, the voltage-controlled oscillators are connected to the duplexer of the interface module and the second selection switch sub-contacts, and the second selection switch main contacts are connected to the test host.

Preferably, the number of the test hosts is 3, and each test host is connected with 1 power amplifier module and 1 to 4 intermodulation testers. Three test hosts can be used for high-frequency, intermediate-frequency and low-frequency tests respectively, wherein each tester covers a certain frequency band.

Preferably, the switch module includes four independent switches, the first switch and the second switch main contacts are connected to the power amplifier module, the third switch main contact is connected to the USB power meter, the fourth switch main contact is connected to the receiver, and the sub-contacts of each switch are respectively connected to the intermodulation tester.

The whole operation process of the system comprises the following steps: the main control computer is connected with an industrial personal computer of the test host through a communication network, the industrial personal computer sends an instruction to complete contact switching of the switch module, then the industrial personal computer sends frequency signals F1 and F2 to the broadband signal source channel, signals output by the broadband signal source channel are connected to the switch module through the power amplifier module, and then the signals are connected to the signal source processing module of the intermodulation tester through corresponding contacts, wherein a coupler of the signal source processing module is simultaneously connected with the power divider, the signals are transmitted to the USB power meter of the test host after being processed by the power divider, the USB power meter feeds back the signals to the industrial personal computer, and then the industrial personal computer or the main control computer controls adjustment of the frequency signals F1 and F2, so that the industrial personal computer. In addition, the signal source processing module transmits the processed signals to the duplexer of the interface module, returns to the duplexer after passing through the device to be tested and transmits the signals to the self-checking module, the self-checking module transmits PIM signals to a receiver of the test host, the receiver transmits the signals to the industrial personal computer, and finally the industrial personal computer gathers the signals and communicates with the main control computer, and the main control computer judges or generates a report.

The substantial effects of the invention include: the multi-frequency intermodulation test is supported, meanwhile, closed-loop feedback is used during testing, test data are adjusted in real time, the precision is improved, connection control among a plurality of devices is achieved through a plurality of switches, the intermodulation test process is simplified, the test efficiency is improved, and the test cost is reduced.

Drawings

FIG. 1 is an overall schematic diagram of an embodiment of the present invention;

FIG. 2 is a diagram illustrating a single set of test modules according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an intermodulation tester according to an embodiment of the present invention;

the figure includes: 1-master control computer, 2-test host, 3-intermodulation tester, 4-power amplifier module, 101-first broadband signal source, 102-coupler A, 103-isolator A, 104-second broadband signal source, 105-coupler B, 106-isolator B, 107-first switch, 108-second switch, 109-third switch, 110-fourth switch, 111-USB power meter, 112-receiver, 113-network interface, 114-industrial personal computer, 301-coupler C, 302-isolator C, 303-coupler D, 304-isolator D, 305-3dB bridge, 306-first selection switch, 307-duplexer A, 308-duplexer B, 309-dry voltage controlled oscillator A, 310-dry voltage controlled oscillator B, 311-a second selection switch, 312-a power divider, 313-a communication interface and 314-a driving module.

Detailed Description

The technical solution is further described with reference to specific examples.

Example (b):

as shown in fig. 1, a multi-frequency concurrent intermodulation test system includes a main control computer 1, three test hosts 2 and a power amplifier module 4, wherein the first and second test hosts 2 are respectively connected to 3 intermodulation testers 3, and the last test host 2 is connected to one intermodulation tester 3. The connecting frame enables intermodulation tests aiming at multiple frequencies to be carried out simultaneously, simplifies the test process, improves the test efficiency and reduces the test cost.

Fig. 2 is a schematic diagram of a first group of test modules in this embodiment, which includes a test host 2, a power amplifier module 4, and three intermodulation testers 3, where the test host 2 includes a first broadband signal source 101, a coupler a102, an isolator a103, a second broadband signal source 104, a coupler B105, an isolator B106, a first switch 107, a second switch 108, a third switch 109, a fourth switch 110, a USB power meter 111, a receiver 112, a network interface 113, and an industrial personal computer 114. The first broadband signal source 101, the coupler A102, the isolator A103, the second broadband signal source 104, the coupler B105 and the isolator B106 form a broadband signal source path which is specifically divided into a path A and a path B, the four switches are controlled by the industrial personal computer 114, and the four switches respectively comprise a main contact and three sub contacts.

Fig. 3 is a schematic diagram of an intermodulation tester 3 of the present embodiment, which includes: coupler C301, isolator C302, coupler D303, isolator D304, 3dB bridge 305, first selection switch 306, duplexer a307, duplexer B308, dry voltage controlled oscillator a309, dry voltage controlled oscillator B310, second selection switch 311, power divider 312, communication interface 313, and driving module 314. The coupler C301, the isolator C302, the coupler D303, the isolator D304, the 3dB bridge 305, and the first selection switch 306 constitute a signal source processing module, and the power divider 312 is used to connect the coupler C301 and the coupler D303, and simultaneously connect the third switch 109 of the test host 2, and then connect the USB power meter 111 through the third switch 109. The tap of the first selection switch 306 is connected to two duplexer input ports, the output ports of the two duplexers are respectively connected to the main vco a309 and the main vco B310, and then connected to the receiver 112 through the second selection switch 311 to transmit the PIM signal.

The working process of this embodiment is that, firstly, the main control computer 1 sends a command (including port and frequency data) to the industrial control computer 114 of the test host 2, and after the industrial control computer 114 receives the command of the main control computer 1, the test host 2, by analyzing, respectively cuts the first switch 107, the second switch 108, the third switch 109 and the fourth switch 110 to the contacts to be separated according to the extracted test port information. And sending the instruction to an intermodulation tester 3, wherein a first selector switch 306 in the intermodulation tester 3 is tangent to a required branch contact, a second selector switch 311 is tangent to the required branch contact and is connected with a corresponding duplexer, an industrial personal computer 114 sends an extracted frequency F1 value to a path A, a data value of F2 is sent to a path B, generated F1 and F2 frequency signals reach a power amplification module 4 after passing through corresponding broadband signal source channels, the power amplification module 4 is connected with main contacts of a first switch 107 and a second switch 108, the two paths of signals reach the intermodulation tester 3 through switches respectively, pass through a coupler C301 and a coupler D303, are sent to a power divider 312 for synthesis and then sent back to a USB power meter 111, a power value is analyzed by 114 and compared with the power value sent by the industrial personal computer, the power is dynamically adjusted until the two paths of signals are locked on a correct power level, and F1 and F2 enter a 3dB 305 bridge through an isolator C302 and an isolator D304 respectively to complete the synthesis of the two paths of signals. The synthesized signal is sent to a TX path of a duplexer through a first selector switch 306 and then to a tested piece, intermodulation of 2F1-F2, 3F1-F2 and the like generated by the tested piece, which falls in an RX band, reaches a second selector switch 311 through an RX filter and then is led to a fourth switch 110, a PIM signal reaches a receiver 112 through the fourth switch 110, the industrial personal computer 114 can read frequency spectrum data of the receiver 112, namely a PIM value, the PIM data is transmitted to a main control computer 1 through a network port by the industrial control board 114, a pair of frequencies and corresponding PIM values are obtained at the moment, the above modes are repeated, the values of F1 and F2 are changed, the PIM value is read, the industrial control board 114 is transmitted to the main control computer 1, a series of frequency points and combined PIM data are generated by the main control computer 1, and finally the main control computer 1 judges whether the product is qualified or not or generates a report.

It should be noted that the specific examples are only used for further illustration of the technical solution and are not used for limiting the scope of the technical solution, and any modification, equivalent replacement, improvement and the like based on the technical solution should be considered as being within the protection scope of the present invention.

Claims

1. A multi-frequency concurrent intermodulation test system comprises a main control computer and a test module, and is characterized in that the test module comprises:

the test hosts are communicated with the main control computer and execute the command of the main control computer;

the power amplification modules are connected with the test host and amplify the initial frequency signals;

the intermodulation testers are connected with the test host and used for connecting the tested piece;

each test host is connected with at least one intermodulation tester.

2. The multi-frequency concurrent intermodulation test system of claim 1, wherein the test host comprises:

the industrial personal computer is communicated with the main control computer and controls the test host;

the broadband signal source channel is connected with the industrial personal computer and the power amplification module;

the switch module is controlled by the industrial personal computer and is connected with the power amplification module and the intermodulation tester;

the USB power meter is connected with the industrial personal computer and is connected with the intermodulation tester through the switch module;

and the receiver is connected with the industrial personal computer and is connected with the intermodulation tester through the switch module.

3. A multi-frequency concurrent intermodulation test system as claimed in claim 1 or 2, wherein the intermodulation test system comprises:

the driving module controls the intermodulation tester and is in communication connection with the test host;

the signal source processing module is connected with the test host;

the interface module is connected with the signal source processing module and comprises a plurality of duplexers and a test interface used for connecting a piece to be tested;

the power divider is connected with the signal source processing module and the test host;

and the self-checking module is connected with the test host and the interface module.

4. The multi-frequency concurrent intermodulation test system of claim 3, wherein the signal source processing module comprises two couplers, two isolators, a 3dB bridge and a first selection switch, the couplers receive signals from the test host and are connected to the isolators and the power divider, the isolators are connected to the 3dB bridge, the 3dB bridge is connected to the first selection switch main contact, and the first selection switch sub-contact is connected to the diplexer of the interface module.

5. A multi-frequency concurrent intermodulation test system as claimed in claim 3, wherein the self-test module comprises a plurality of voltage-controlled oscillators and a second selection switch, the voltage-controlled oscillators are connected to the diplexer and the second selection switch branch contacts of the interface module, and the second selection switch main contact is connected to the test host.

6. The multi-frequency concurrent intermodulation test system of claim 1, wherein the number of the test hosts is 3, and each test host is connected to 1 power amplifier module and 1 to 4 intermodulation testers.

7. The multi-frequency concurrent intermodulation test system of claim 2 wherein the switch module comprises four separate switches, a first switch and a second switch having main contacts connected to the power amplifier module, a third switch having main contacts connected to the USB power meter, and a fourth switch having main contacts connected to the receiver, and sub-contacts of each switch connected to the intermodulation tester.