CN107359944A - Bluetooth equipment radio frequency test system - Google Patents

Bluetooth equipment radio frequency test system Download PDF

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Publication number
CN107359944A
CN107359944A CN201710747775.9A CN201710747775A CN107359944A CN 107359944 A CN107359944 A CN 107359944A CN 201710747775 A CN201710747775 A CN 201710747775A CN 107359944 A CN107359944 A CN 107359944A
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China
Prior art keywords
port
tested
radio frequency
bluetooth
test
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CN201710747775.9A
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CN107359944B (en
Inventor
刘菁
张秩维
魏阳
杨波
李佐昭
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China Academy of Information and Communications Technology CAICT
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China Academy of Information and Communications Technology CAICT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

The invention provides a kind of bluetooth equipment radio frequency test system, the system includes：Bluetooth comprehensive test instrument, spectrum analyzer, vector signal generator, analog signal generator and RF switch case；Wherein, RF switch case, for providing a plurality of radio frequency testing path, control：The transmitter and receiver of bluetooth comprehensive test instrument device under test carries out the test of radio-frequency performance project；Or bluetooth comprehensive test instrument coordinates the emitter progress frequency domain for carrying out spectrum analyzer device under test or the test of time domain project with spectrum analyzer；Or bluetooth comprehensive test instrument coordinates the test for carrying out the anti-interference C/I projects of receiver with vector signal generator；Or bluetooth comprehensive test instrument coordinates the anti-interference obstruction project testing for carrying out receiver with analog signal generator；Or bluetooth comprehensive test instrument coordinates the test for carrying out receiver intermodulation project with vector signal generator, analog signal generator jointly.Above-mentioned technical proposal improves the operating efficiency and accuracy of bluetooth equipment radio frequency testing, has saved cost of labor.

Description

Bluetooth device radio frequency test system
Technical Field
The invention relates to the technical field of Bluetooth equipment testing, in particular to a Bluetooth equipment radio frequency testing system.
Background
Bluetooth is a sophisticated open wireless communication standard that uses UHF radio waves in the ISM band of 2.4-2.485GHz to enable short-range data exchange between various electronic devices. Bluetooth technology is managed by the Bluetooth Special Interest Group (SIG for short) which is composed of more than 24000 companies in various fields around the world. The primary task of the SIG is to take care of the development of bluetooth specifications, including radio frequency, Profile, protocols, etc., to manage certification projects and to maintain bluetooth brand rights. Manufacturers' products must pass the certification test of the bluetooth alliance if they want to declare that their products support bluetooth technology by using the Logo of bluetooth on the outsourcing.
In the actual production of the tested product, most manufacturers directly purchase the bluetooth chip or bluetooth module which has obtained the SIG authentication and integrate the bluetooth chip or bluetooth module into their tested products, such as mobile phones, notebook computers, walkmans, and the like. However, because the types of the tested products are different, it is inevitable to modify the original chip in various ways during the integration process, such as replacing the antenna, replacing the power supply, etc., and these modifications inevitably cause the bluetooth radio frequency performance of the tested product to change, so it is important to strictly test the radio frequency performance of the tested product before the tested product is marketed, so as to ensure that the wireless index of the tested product meets the requirement of the bluetooth radio frequency specification.
At present, most of Bluetooth radio frequency test systems are radio frequency test systems built by a plurality of single instruments of various large test instrument manufacturers, or different test environments need to be temporarily built according to different test requirements, and testers need to manually operate and configure the test instruments. The former increases the cost of the test and the latter increases the test time and the instability of the test. The two methods have low working efficiency, the consistency of the test result is difficult to ensure, and the individual test items are difficult to complete according to the requirements of the test specification, so that a set of complete Bluetooth radio frequency automatic test system is developed as soon as possible, the working efficiency and the accuracy of the test result are improved, and the labor cost is saved, which is particularly necessary.
Disclosure of Invention
The embodiment of the invention provides a Bluetooth device radio frequency test system, which is used for improving the working efficiency and the accuracy of the Bluetooth device radio frequency test and saving the labor cost, and comprises the following components: the device comprises a Bluetooth comprehensive tester, a spectrum analyzer, a vector signal generator, an analog signal generator and a radio frequency switch box; wherein,
the Bluetooth comprehensive tester is used for sending downlink signals to the equipment to be tested, receiving uplink signals of the equipment to be tested, establishing loopback connection with the equipment to be tested, and testing radio frequency performance items of a transmitter and a receiver of the equipment to be tested;
the device comprises a frequency spectrum analyzer and a control module, wherein the frequency spectrum analyzer is used for receiving an uplink signal of the device to be tested and testing a frequency domain or time domain project of a transmitter of the device to be tested when the Bluetooth comprehensive tester is in communication connection with the device to be tested;
the vector signal generator is used for generating a vector interference signal and sending the vector interference signal to the equipment to be tested when the Bluetooth comprehensive tester is in communication connection with the equipment to be tested, and is matched with the Bluetooth comprehensive tester to test the radio frequency anti-interference C/I project of a receiver of the equipment to be tested; or generating vector interference signals and sending the vector interference signals to the equipment to be tested, and carrying out intermodulation item test on a receiver of the equipment to be tested by cooperating with a single-frequency interference signal generated by the analog signal generator and the Bluetooth comprehensive tester;
the analog signal generator is used for generating a single-frequency interference signal and sending the single-frequency interference signal to the equipment to be tested when the Bluetooth comprehensive tester is in communication connection with the equipment to be tested, and is matched with the Bluetooth comprehensive tester to test a radio frequency anti-interference blocking item of a receiver of the equipment to be tested; or generating a single-frequency interference signal and sending the single-frequency interference signal to the equipment to be tested, and carrying out intermodulation item test on a receiver of the equipment to be tested by cooperating with the vector interference signal generated by the vector signal generator and the Bluetooth comprehensive tester;
radio frequency switch box, with bluetooth is synthesized appearance, spectral analysis appearance, vector signal generator, analog signal generator and the equipment that awaits measuring and is connected for according to the radio frequency test item of predetermineeing to the equipment that awaits measuring going on, predetermine test signal power and frequency requirement, provide many radio frequency test path, control: the Bluetooth comprehensive tester tests the radio frequency performance items of a transmitter and a receiver of the equipment to be tested; or the Bluetooth comprehensive tester and the spectrum analyzer are matched to complete the test of the spectrum analyzer on the frequency domain or time domain items of the transmitter of the equipment to be tested; or the Bluetooth comprehensive tester is matched with the vector signal generator, and the Bluetooth comprehensive tester is used for testing the radio frequency anti-interference C/I project of the receiver of the equipment to be tested; or the Bluetooth comprehensive tester is matched with the analog signal generator, and the receiver of the equipment to be tested is tested for the radio frequency anti-interference blocking item through the Bluetooth comprehensive tester; or the Bluetooth comprehensive tester is matched with the vector signal generator and the analog signal generator together, and the receiver of the equipment to be tested is tested for intermodulation items through the Bluetooth comprehensive tester.
Compared with a radio frequency test system built by a plurality of single instruments or different test environments temporarily built according to different test requirements in the prior art, the technical scheme provided by the embodiment of the invention can provide a plurality of radio frequency test paths and control the radio frequency test paths through the radio frequency switch box according to the preset radio frequency test items and the preset test signal power and frequency requirements of the equipment to be tested: the Bluetooth comprehensive tester completes the test of the transmitter and receiver items of the equipment to be tested; or the Bluetooth comprehensive tester and the spectrum analyzer are matched to complete the test of the spectrum analyzer on the frequency domain or time domain items of the transmitter of the equipment to be tested; or the Bluetooth comprehensive tester is matched with the vector signal generator, and the receiver of the equipment to be tested is tested for the radio frequency anti-interference item through the Bluetooth comprehensive tester; or the Bluetooth comprehensive tester is matched with the analog signal generator, and the receiver of the equipment to be tested is tested for the radio frequency anti-interference item blocking item through the Bluetooth comprehensive tester; or the bluetooth integrated tester cooperates with the vector signal generator and the analog signal generator together, and the receiver of the equipment to be tested is subjected to intermodulation project test through the bluetooth integrated tester, so that the scheme does not need testers to manually operate and configure the instrument, and does not need a plurality of instruments to be built, thereby improving the working efficiency, and simultaneously saving the labor cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a radio frequency test system of a Bluetooth device in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit structure of a radio frequency switch box according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first RF test path according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a second RF test path according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a third RF test path according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a fourth rf test path in an embodiment of the invention.
Fig. 7 is a schematic structural diagram of a fifth rf test path in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
The Bluetooth equipment radio frequency test system is composed of a Bluetooth comprehensive tester, a spectrum analyzer, a vector signal generator, an analog signal generator, a radio frequency switch and an industrial control computer, and realizes automatic test on test items defined in a Bluetooth radio frequency test specification. The test process data (test log) is stored, and after the test is finished, the test result can be stored as formatted data, so that the test result can be conveniently checked and delivered to a detected manufacturer. Compared with the Bluetooth radio frequency test system in the prior art, the Bluetooth radio frequency test system adopts an innovative test method, reduces the requirement on instrument configuration, and has the advantages of reducing cost, increasing efficiency and the like. The bluetooth device test system will be described in detail below.
Fig. 1 is a schematic structural diagram of a bluetooth device radio frequency test system in an embodiment of the present invention, and as shown in fig. 1, the bluetooth device radio frequency test system includes: the Bluetooth comprehensive tester 100, the spectrum analyzer 200, the vector signal generator 300, the analog signal generator 400 and the radio frequency switch box 500; wherein,
the bluetooth comprehensive tester 100 is configured to send a downlink signal to the device to be tested and receive an uplink signal of the device to be tested, establish loopback connection with the device to be tested, and test a part of radio frequency performance items of a transmitter and a receiver of the device to be tested; during specific implementation, a loopback connection is established between the Bluetooth comprehensive tester and the equipment to be tested, and an uplink signal of the equipment to be tested is measured or the bit error rate or the packet loss rate is counted; in specific implementation, the bluetooth integrated tester can complete the test of the radio frequency performance part items of the transmitter and the receiver of the device to be tested, for example: power control, carrier frequency margin, carrier frequency offset, reference sensitivity, maximum input level test wait;
the frequency spectrum analyzer 200 is used for receiving an uplink signal of the equipment to be tested when the bluetooth comprehensive tester establishes communication connection with the equipment to be tested, and testing a transmitter of the equipment to be tested in a frequency domain or a time domain; in specific implementation, an uplink signal of the equipment to be tested is shunted to a frequency spectrograph, and each index on a frequency domain or a time domain is measured; in specific implementation, the transmitter of the device to be tested can be tested in the frequency domain or the time domain, such as the maximum transmitting power, the power spectral density and the like;
the vector signal generator 300 is used for generating a vector interference signal and sending the vector interference signal to the equipment to be tested when the Bluetooth comprehensive tester establishes communication connection with the equipment to be tested, and is matched with the Bluetooth comprehensive tester to test a radio frequency anti-interference carrier-to-interference ratio C/I project of a receiver of the equipment to be tested; or generating vector interference signals and sending the vector interference signals to the equipment to be tested, and carrying out intermodulation item test on a receiver of the equipment to be tested by cooperating with a single-frequency interference signal generated by the analog signal generator and the Bluetooth comprehensive tester;
the analog signal generator 400 is used for generating a single-frequency interference signal and sending the signal to the device to be tested when the bluetooth comprehensive tester establishes communication connection with the device to be tested, and is matched with the bluetooth comprehensive tester to test a radio frequency anti-interference blocking item for a receiver of the device to be tested; or generating a single-frequency interference signal and sending the single-frequency interference signal to the equipment to be tested, and carrying out intermodulation item test on a receiver of the equipment to be tested by cooperating with the vector interference signal generated by the vector signal generator and the Bluetooth comprehensive tester;
radio frequency switch box 500 is connected with bluetooth integrated tester 100, spectrum analyzer 200, vector signal generator 300, analog signal generator 400 and equipment under test 600 for according to the radio frequency test item of predetermineeing that goes on equipment under test 600, predetermine test signal power and frequency requirement, provide many radio frequency test path, control: the Bluetooth comprehensive tester completes the test of the radio frequency performance items of the transmitter and the receiver of the device to be tested; or the Bluetooth comprehensive tester and the spectrum analyzer are matched to complete the test of the spectrum analyzer on the frequency domain or time domain items of the transmitter of the equipment to be tested; or the Bluetooth comprehensive tester is matched with the vector signal generator, and the Bluetooth comprehensive tester is used for testing the radio frequency anti-interference C/I project of the receiver of the equipment to be tested; or the Bluetooth comprehensive tester is matched with the analog signal generator, and the receiver of the equipment to be tested is tested for the radio frequency anti-interference blocking item through the Bluetooth comprehensive tester; or the Bluetooth comprehensive tester is matched with the vector signal generator and the analog signal generator together, and the receiver of the equipment to be tested is tested for intermodulation items through the Bluetooth comprehensive tester.
During specific implementation, the Bluetooth comprehensive tester is used for establishing communication connection between a user and equipment to be tested and testing the radio frequency performance. The Bluetooth comprehensive tester can independently complete part of test items and can also generate vector interference signals and single-frequency interference signals. The spectrum analyzer is mainly used for testing a frequency domain or a time domain, and the system is mainly used for testing related items of a transmitter and calibrating a radio frequency circuit. The vector signal generator is used for generating vector interference signals and is mainly used for testing anti-interference C/I and intermodulation related items of a receiver in the system. The analog signal generator is used for generating single-frequency interference signals and is mainly used for testing anti-interference blockage and intermodulation items of a receiver in the system.
In specific implementation, the radio frequency test mentioned in the embodiment of the present invention mainly includes the existing radio frequency performance test and radio frequency interference test. The radio frequency performance test mainly comprises the performance test of a transmitter and a receiver of the equipment to be tested, the technical indexes of the transmitter comprise phase error and frequency error, the output power of the transmitter, burst pulse timing, the power/time envelope of the burst pulse and the like, and the technical index of the receiver is reference sensitivity. The radio frequency interference test mainly comprises tests of anti-interference C/I, intermodulation related items and the like.
In one embodiment, the above-mentioned bluetooth device radio frequency test system further includes: the industrial control computer 700 is connected with the Bluetooth comprehensive tester 100, the spectrum analyzer 200, the vector signal generator 300, the analog signal generator 400 and the radio frequency switch box 500, and is used for completing the radio frequency performance test of the transmitter and the receiver of the device to be tested by controlling the work of the Bluetooth comprehensive tester, the spectrum analyzer, the vector signal generator, the analog signal generator and the radio frequency switch box, and the test is intelligent and automatic.
In specific implementation, a GPIB (General-Purpose Interface Bus) control card and automatic test system software of a device under test are installed in the industrial personal computer (industrial control computer 700), and are connected to the various instruments (the bluetooth integrated tester 100, the spectrum analyzer 200, the vector signal generator 300, the analog signal generator 400, and the radio frequency switch box 500) in the system through GPIB or other control cables. When the test system software runs, instruments in the system can be controlled through a GPIB bus or other control cables, and how to control is described in detail below.
The radio frequency switch box comprises passive devices such as a circulator, a combiner, a one-way device, a filter and the like, and the radio frequency switch, the radio frequency connecting cable and the like are a test link control unit of the whole set of radio frequency test system. The radio frequency switch box realizes the separation of the uplink control signal and the downlink control signal, and effectively and pertinently tests a tested piece (equipment to be tested). The function of the components inside the rf switch box will be described below.
A circulator: the function is to separate the uplink and downlink of the signal in the link, and effectively perform each item of test.
A combiner: the method has the function of combining the useful signal and the interference signal to ensure the test of the interference item.
A one-way device: the effect is that the signal unidirectional transmission of guaranteeing to pass through avoids reverse burnout instrument.
A filter: and the signals are subjected to frequency selective filtering, so that the test accuracy of related items is ensured.
A radio frequency switch: for selecting the corresponding link in the rf box.
As shown in fig. 2, the interface of the rf switch box: the first test port 503 is used for connecting to the bluetooth integrated tester 100; the fourth test port 522 is used for connecting to the output port of the vector signal generator 300, and is used for transmitting an interference signal during the radio frequency test; the third test port 511 is used for connecting to the output port of the analog signal generator 400, and is used for transmitting an interference signal during the radio frequency test; a second test port 509 is for connection to an input port of a spectrum analyzer for measurement of signals.
In specific implementation, the device to be tested and each test instrument (the bluetooth integrated tester 100, the spectrum analyzer 200, the vector signal generator 300, and the analog signal generator 400) in the bluetooth device radio frequency test system are connected and communicated through a radio frequency switch box. The main working principle is as follows: the downlink useful signal output by the Bluetooth comprehensive tester, the vector interference signal output by the vector signal generator and the single-frequency interference signal output by the analog signal generator enter a radio frequency switch box, and are input to a receiving port of the device to be tested after passing through a radio frequency path configured in the radio frequency switch box; and an uplink signal transmitted by the equipment to be tested also enters the radio frequency switch box, passes through an uplink and is finally input to a port of the Bluetooth comprehensive tester or a port of the frequency spectrograph to measure the radio frequency index of the Bluetooth comprehensive tester. The Bluetooth comprehensive tester, the radio frequency switch box and the device to be tested form a complete communication loop, and the radio frequency switch box realizes an uplink/downlink signal transmission path. The industrial control computer controls the instruments in the system through a GPIB bus or a network wire to complete the radio frequency test. The specific structure of the rf switch box and the testing process will be described in detail below.
Fig. 2 shows a schematic structural diagram of a radio frequency switch box in an embodiment of the invention. The radio frequency switch box is controlled to change a corresponding path so that signals pass through corresponding passive devices to realize the separation and test requirements of uplink/downlink signals. The bluetooth radio frequency test includes a transmitter test and a receiver test. Aiming at different test items, the radio frequency switch in the radio frequency switch box is adjusted, so that the radio frequency path switching in the radio frequency switch box is realized, and the radio frequency test is completed.
In one embodiment, the rf switch box 500 includes: and the first radio frequency test path is used for connecting the Bluetooth comprehensive tester with the equipment to be tested and switching on the Bluetooth comprehensive tester when the intensity of the downlink signal received by the antenna port of the equipment to be tested is required to be higher than the preset signal intensity, and carrying out radio frequency performance test on the transmitter and the receiver of the equipment to be tested.
In one embodiment, as shown in FIG. 3, the first radio frequency test path includes:
a first switch K9, the first switch K9 comprising: a first movable contact 1, a first stationary contact 11, a second stationary contact 12, and a third stationary contact 13; the first moving contact 1 is connected with a radio frequency port of the device to be tested 600;
a second switch K6, the second switch comprising: a second movable contact 2, a first normally closed contact NC1, and a first normally open contact NO 1; the first normally closed contact NC1 is connected with the first stationary contact 11 of the first switch;
a first test port 503, a first port of the first test port 503 is connected to the second movable contact 2, and a second port of the first test port 503 is connected to the bluetooth integrated tester 100;
the industrial control computer is specifically configured to control the first movable contact 1 to be connected with the first stationary contact 11, and the second movable contact 2 to be connected with the first normally closed contact NC1 when the strength of a downlink signal received by an antenna port of a device to be tested is higher than the preset signal strength for a preset radio frequency test item, so as to perform radio frequency performance test on a transmitter and a receiver of the device to be tested.
In specific implementation, fig. 3 is a connection block diagram of the radio frequency switch box according to the embodiment of the present invention when the bluetooth integrated tester completes the test items of the transmitter and the receiver. A downlink signal of the Bluetooth comprehensive tester is directly connected to a radio frequency port of the device to be tested through a radio frequency cable; the radio frequency port of the equipment to be tested is directly connected to the input port of the Bluetooth comprehensive tester through the radio frequency cable to form a complete loop, so that the Bluetooth comprehensive tester can test items of the equipment to be tested.
In one embodiment, the rf switch box 500 further comprises: and the second radio frequency test path is used for connecting the Bluetooth comprehensive tester and the spectrum analyzer with the equipment to be tested when the downlink signal intensity received by the antenna port of the equipment to be tested is lower than the preset signal intensity in the preset radio frequency test item, and testing the frequency domain or time domain item of the transmitter of the equipment to be tested.
In one embodiment, as shown in FIG. 4, the second radio frequency test path includes:
the first circulator 504 comprises three ports, and a first port of the first circulator 504 is connected with a first normally open contact NO1 of a second switch K6 and used for separating a downlink signal sent by the bluetooth comprehensive tester from an uplink signal sent by the device to be tested;
a first isolator 505, where the first isolator 505 includes two ports, and a first port of the first isolator is connected to a second port of the first circulator 504, and is used to ensure that the uplink signal passing through is transmitted in a single direction;
the power divider 506 comprises three ports, wherein a first port of the power divider 506 is connected with a second port of the first isolator 505, and is used for shunting the uplink signal to the bluetooth comprehensive tester and the spectrum analyzer, and testing a transmitter frequency domain or time domain item on the spectrum analyzer;
the second circulator 518, where the second circulator 518 includes three ports, and a first port of the second circulator 518 is connected to a second port of the power divider 506, and is used to separate a downlink signal sent by the bluetooth comprehensive tester from an uplink signal sent by the device to be tested;
a third switch K2, comprising: a third movable contact 3, a second normally closed contact NC2, and a second normally open contact NO 2; the third movable contact 3 is connected with the second port of the second circulator, and the second normally closed contact NC2 is connected with the second fixed contact 12 of the first switch K9;
a second test port 509, a first port of the second test port 509 being connected to an input of the spectrum analyzer 200;
a second isolator 510, where the second isolator 510 includes two ports, a first port is connected to a second end of the second test port 509, and a second port is connected to a third port of the power divider 506, and is used to ensure that an uplink signal sent from a device to be tested is transmitted in a single direction;
a fourth isolator 521, which includes two ports, a first port is connected to the third port of the first circulator 504, and is configured to ensure unidirectional transmission of a downlink signal sent from the bluetooth integrated tester;
a third isolator 520, which includes two ports, a first port is connected to a second port of the fourth isolator 521, and is used to ensure unidirectional transmission of a downlink signal sent from the bluetooth integrated tester;
a first combiner 529, where the first combiner includes four ports, a first port is connected to a second port of the third one-way coupler 520, and is used to combine with an interference signal during an interference-free test, and the first combiner 529 only plays an actual role in an interference-free item, and in a general test example, one end of the interference signal does not transmit, and can play a role of a load;
a ninth isolator 526, where the ninth isolator includes two ports, a first port is connected to a second port of the first combiner 529, and is used to ensure that a downlink signal sent from the bluetooth integrated tester is transmitted in a single direction;
a tenth unidirectional unit 527, which includes two ports, a first port is connected to the second port of the ninth unidirectional unit 526, and is configured to ensure unidirectional transmission of a downlink signal sent from the bluetooth integrated tester;
the industrial control computer is specifically used for controlling the first movable contact 1 to be connected with the second fixed contact 12, the third movable contact 3 to be connected with the second normally closed contact NC2, the second movable contact 2 of the second switch to be connected with the first normally open contact NO1 when the strength of a downlink signal received by an antenna port of the device to be tested is lower than the preset signal strength in a preset radio frequency test project, and testing a frequency domain or time domain project on the transmitter of the device to be tested.
In specific implementation, the ninth one-way device 526 and the tenth one-way device 527, which are two one-way devices, are arranged in succession and have the following functions: the protection effect is achieved, an actual one-way device is also possible, and the two one-way devices are connected in series only for better protecting the damage of echo signals to the instrument when impedance is not matched. In the embodiment of the invention, the following are mentioned for many times: two one-way clutches are provided in succession, the function of which is identical to that of the ninth one-way clutch 526 and the tenth one-way clutch 527.
In specific implementation, fig. 4 is a connection block diagram of the radio frequency switch box according to the embodiment of the present invention when the transmitter test item is completed through the spectrum analyzer, and as shown in fig. 4, the downlink signal of the bluetooth integrated tester is connected to the radio frequency port of the device under test through the first circulator 504, the fourth isolator 521, the third isolator 520, the first combiner 529, the ninth isolator 526, the tenth isolator 527, and the second circulator 518. The radio frequency port of the device to be tested is connected to the input port of the bluetooth comprehensive tester through the second circulator 518, the power divider 506 and the first isolator 505 to form a complete loop, and the radio frequency port of the device to be tested is connected to the input port of the spectrum analyzer through the second circulator 518, the power divider 506 and the second isolator 510 to realize the project test of the spectrum analyzer on the transmitter frequency domain or the time domain of the device to be tested.
In one embodiment, the rf switch box 500 further comprises: and the third radio frequency test path is used for connecting the Bluetooth comprehensive tester and the vector signal generator with the equipment to be tested and testing the radio frequency anti-interference C/I project of the receiver of the equipment to be tested.
In one embodiment, the third radio frequency test path comprises:
a fourth test port 512, a first port of which is connected with the output end of the vector signal generator;
a sixth isolator 523, a first port of the sixth isolator 523 is connected to a second port of the fourth test port 512, and is configured to ensure that a vector interference signal sent from the vector signal generator is transmitted in a single direction;
a fifth isolator 522, a first port of which is connected to the second port of the sixth isolator 523, for ensuring unidirectional transmission of the vector interference signal sent from the vector signal generator;
a second port of the fifth one-way coupler 522 is connected to a third port of the first combiner 529, and the first combiner 529 is configured to combine the vector interference signal with a downlink signal sent from the bluetooth comprehensive tester in a single direction;
the industrial control computer is used for controlling the first movable contact to be communicated with the second fixed contact, the second movable contact to be communicated with the first normally open contact NO1 of the second switch, and the third movable contact of the third switch to be communicated with the second normally closed contact, so that the radio frequency anti-interference C/I item test is carried out on the receiver to be tested.
In one embodiment, the rf switch box 500 further comprises: and the fourth radio frequency test path is used for connecting the Bluetooth comprehensive tester, the vector signal generator and the analog signal generator with the equipment to be tested and testing intermodulation items of the receiver of the equipment to be tested.
In one embodiment, the fourth radio frequency test path comprises:
a third test port 511, wherein a first port of the third test port 511 is connected with an output end of the analog signal generator;
a fourth switch K3, comprising: a fourth movable contact 4, a third normally closed contact NC3, and a third normally open contact NO 3; the fourth movable contact 4 is connected with a second port of the third test port 511;
the first port of the eighth isolator 525 is connected with the third normally closed contact NC3 of the fourth switch K3, and is used for ensuring the unidirectional transmission of the single-frequency interference signal sent from the analog signal generator;
a seventh isolator 524, wherein a first port of the seventh isolator 524 is connected to a second port of the eighth isolator 525, and is configured to ensure unidirectional transmission of a single-frequency interference signal transmitted from the analog signal generator;
a second port of the seventh one-way coupler 524 is connected to a fourth port of the first combiner 529, and the first combiner 529 is configured to combine a single-frequency interference signal, a vector interference signal, and a downlink signal sent from the bluetooth integrated tester in a single direction;
the industrial control computer tool is used for controlling the first movable contact 1 to be communicated with the second fixed contact 12, the second movable contact 2 to be communicated with a first normally open contact NO1 of the second switch, the third movable contact 3 of the third switch to be communicated with a second normally closed contact NC2, and the fourth movable contact 4 of the fourth switch to be communicated with a third normally closed contact NC3, so that the test of intermodulation items is carried out on the receiver of the equipment to be tested.
In one embodiment, the rf switch box 500 further comprises: and the fifth radio frequency test path is used for connecting the Bluetooth comprehensive tester and the analog signal generator with the equipment to be tested and testing the radio frequency anti-interference blocking item of the receiver of the equipment to be tested.
In one embodiment, the fifth radio frequency test path includes:
the second combiner 517 includes three ports, where a first port of the second combiner 517 is connected to the third stationary contact 13 of the first switch K9, and is configured to combine a single-frequency interference signal sent from the analog signal generator with a downlink signal sent from the bluetooth comprehensive tester in a single direction;
a second attenuator 528, a first port of the second attenuator 528 is connected to a second port of the second combiner 517, and a second port of the second attenuator 528 is connected to the second normally-open contact NO2 of the third switch K2;
a first port of the first attenuator 527 is connected with a third port of the second combiner 517, and is used for link impedance matching;
a fifth switch K4, comprising: a fifth movable contact 5, a fourth normally closed contact NC4, and a fourth normally open contact NO 4; the fifth moving contact 5 is connected with the second port of the first attenuator 527;
the sixth switch K5 includes: a sixth movable contact 6, a fifth normally closed contact NC5, and a fifth normally open contact NO 5; a fifth normally closed contact NC5 is connected with a fourth normally closed contact NC4 of a fifth switch K4, and the sixth movable contact 6 is connected with a third normally open contact NO3 of the fourth switch K3;
the industrial control computer machine is used for controlling the first movable contact 1 of the first switch K9 to be communicated with the third fixed contact 13, the second movable contact 2 of the second switch K6 to be communicated with the first normally-open contact NO1, the third movable contact 3 of the third switch K2 to be communicated with the second normally-open contact NO2, the fourth movable contact 4 of the fourth switch K3 to be communicated with the third normally-open contact NO3, the fifth movable contact 5 of the fifth switch K4 to be communicated with the fourth normally-closed contact NC4, the sixth movable contact 6 of the sixth switch K5 to be communicated with the fifth normally-closed contact NC5, and the fourth normally-closed contact NC4 to be communicated with the fifth normally-closed contact NC5, so that the receiver of the equipment to be tested is subjected to the test of intermodulation items.
In the implementation, the ports NO5 and NO4 are open ports, and these two ports are not connected with any equipment or device at present, which is a path interface reserved for subsequent upgrading. The meaning of the above link impedance matching is: the standing wave ratio in the link is reduced, and if the standing wave ratio is large, the uncertainty of the system becomes large, and the test is inaccurate.
It will be apparent to those skilled in the art that the modules or steps of the embodiments of the invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. A bluetooth device radio frequency test system, comprising: the device comprises a Bluetooth comprehensive tester, a spectrum analyzer, a vector signal generator, an analog signal generator and a radio frequency switch box; wherein,
the Bluetooth comprehensive tester is used for sending downlink signals to the equipment to be tested, receiving uplink signals of the equipment to be tested, establishing loopback connection with the equipment to be tested, and testing radio frequency performance items of a transmitter and a receiver of the equipment to be tested;
the device comprises a frequency spectrum analyzer and a control module, wherein the frequency spectrum analyzer is used for receiving an uplink signal of the device to be tested and testing a frequency domain or time domain project of a transmitter of the device to be tested when the Bluetooth comprehensive tester is in communication connection with the device to be tested;
the vector signal generator is used for generating a vector interference signal and sending the vector interference signal to the equipment to be tested when the Bluetooth comprehensive tester is in communication connection with the equipment to be tested, and is matched with the Bluetooth comprehensive tester to test the radio frequency anti-interference C/I project of a receiver of the equipment to be tested; or generating vector interference signals and sending the vector interference signals to the equipment to be tested, and carrying out intermodulation item test on a receiver of the equipment to be tested by cooperating with a single-frequency interference signal generated by the analog signal generator and the Bluetooth comprehensive tester;
the analog signal generator is used for generating a single-frequency interference signal and sending the single-frequency interference signal to the equipment to be tested when the Bluetooth comprehensive tester is in communication connection with the equipment to be tested, and is matched with the Bluetooth comprehensive tester to test a radio frequency anti-interference blocking item of a receiver of the equipment to be tested; or generating a single-frequency interference signal and sending the single-frequency interference signal to the equipment to be tested, and carrying out intermodulation item test on a receiver of the equipment to be tested by cooperating with the vector interference signal generated by the vector signal generator and the Bluetooth comprehensive tester;
radio frequency switch box, with bluetooth is synthesized appearance, spectral analysis appearance, vector signal generator, analog signal generator and the equipment that awaits measuring and is connected for according to the radio frequency test item of predetermineeing to the equipment that awaits measuring going on, predetermine test signal power and frequency requirement, provide many radio frequency test path, control: the Bluetooth comprehensive tester tests the radio frequency performance items of a transmitter and a receiver of the equipment to be tested; or the Bluetooth comprehensive tester and the spectrum analyzer are matched to complete the test of the spectrum analyzer on the frequency domain or time domain items of the transmitter of the equipment to be tested; or the Bluetooth comprehensive tester is matched with the vector signal generator, and the Bluetooth comprehensive tester is used for testing the radio frequency anti-interference C/I project of the receiver of the equipment to be tested; or the Bluetooth comprehensive tester is matched with the analog signal generator, and the receiver of the equipment to be tested is tested for the radio frequency anti-interference blocking item through the Bluetooth comprehensive tester; or the Bluetooth comprehensive tester is matched with the vector signal generator and the analog signal generator together, and the receiver of the equipment to be tested is tested for intermodulation items through the Bluetooth comprehensive tester.
2. The bluetooth device radio frequency test system of claim 1, further comprising: and the industrial control computer is connected with the Bluetooth comprehensive tester, the spectrum analyzer, the vector signal generator, the analog signal generator and the radio frequency switch box and is used for completing the radio frequency performance test of the transmitter and the receiver of the equipment to be tested by controlling the Bluetooth comprehensive tester, the spectrum analyzer, the vector signal generator, the analog signal generator and the radio frequency switch box to work.
3. The bluetooth device radio frequency test system of claim 2, wherein the radio frequency switch box comprises: and the first radio frequency test path is used for connecting the Bluetooth comprehensive tester with the equipment to be tested and switching on the Bluetooth comprehensive tester when the intensity of the downlink signal received by the antenna port of the equipment to be tested is required to be higher than the preset signal intensity, and carrying out radio frequency performance test on the transmitter and the receiver of the equipment to be tested.
4. The bluetooth device radio frequency test system of claim 3, wherein the first radio frequency test path comprises:
a first switch (K9), the first switch (K9) comprising: a first movable contact (1), a first stationary contact (11), a second stationary contact (12) and a third stationary contact (13); the first movable contact (1) is connected with a radio frequency port of the device to be tested (600);
a second switch (K6), the second switch (K6) comprising: a second movable contact (2), a first normally closed contact (NC1) and a first normally open contact (NO 1); the first normally closed contact (NC1) is connected with a first stationary contact (11) of the first switch (K9);
a first test port (503), wherein a first port of the first test port (503) is connected with the second movable contact (2), and a second port of the first test port (503) is connected with the Bluetooth comprehensive tester (100);
the industrial control computer is specifically used for controlling the first movable contact (1) to be connected with the first fixed contact (11), the second movable contact (2) to be connected with the first normally closed contact (NC1) when the strength of a downlink signal received by an antenna port of the device to be tested is higher than the preset signal strength in a preset radio frequency test project, and performing radio frequency performance test on a transmitter and a receiver of the device to be tested.
5. The bluetooth device radio frequency test system of claim 4, wherein the radio frequency switch box further comprises: and the second radio frequency test path is used for connecting the Bluetooth comprehensive tester and the spectrum analyzer with the equipment to be tested when the downlink signal intensity received by the antenna port of the equipment to be tested is lower than the preset signal intensity in the preset radio frequency test item, and testing the frequency domain or time domain item of the transmitter of the equipment to be tested.
6. The bluetooth device radio frequency test system of claim 5, wherein the second radio frequency test path comprises:
the first circulator (504) comprises three ports, and the first port of the first circulator (504) is connected with the first normally open contact (NO1) of the second switch (K6) and is used for separating a downlink signal sent by the Bluetooth comprehensive tester from an uplink signal sent by the device to be tested;
a first isolator (505), wherein the first isolator (505) comprises two ports, a first port of the first isolator is connected with a second port of the first circulator (504) and is used for ensuring that the passing uplink signal is transmitted in a single direction;
the power divider (506) comprises three ports, wherein a first port of the power divider (506) is connected with a second port of the first isolator (505) and is used for shunting the uplink signal to a spectrum analyzer, and testing a transmitter frequency domain or time domain item on the spectrum analyzer;
the second circulator (518), the second circulator (518) includes three ports, and a first port of the second circulator (518) is connected to a second port of the power divider (506) and is used for separating a downlink signal sent by the bluetooth integrated tester from an uplink signal sent by the device to be tested;
a third switch (K2) comprising: a third movable contact (3), a second normally closed contact (NC2) and a second normally open contact (NO 2); the third movable contact (3) is connected with the second port of the second circulator (518), and the second normally closed contact (NC2) is connected with the second fixed contact (12) of the first switch (K9);
a second test port (509), a first port of the second test port (509) being connected to an input of the spectrum analyzer (200);
the second isolator (510), the second isolator (510) includes two ports, a first port is connected to the second port of the second test port (509), and a second port of the second isolator (510) is connected to the third port of the power divider (506), so as to ensure that the uplink signal sent from the device to be tested is transmitted in a single direction;
the fourth isolator (521), the fourth isolator (521) includes two ports, the first port of the fourth isolator (521) is connected with the third port of the first circulator (504), and the fourth isolator is used for ensuring the one-way transmission of the downlink signal sent from the bluetooth comprehensive tester;
the third isolator (520) comprises two ports, and the first port is connected with the second port of the fourth isolator (521) and used for ensuring the unidirectional transmission of a downlink signal sent from the Bluetooth comprehensive tester;
a first combiner (529), the first combiner (529) comprising four ports, a first port connected to a second port of a third one-way coupler (520);
a ninth one-way unit (526), wherein the ninth one-way unit (526) comprises two ports, a first port is connected with a second port of the first combiner (529) and is used for ensuring that a downlink signal sent from the bluetooth comprehensive tester is transmitted in a single direction;
a tenth unidirectional device (527), wherein the tenth unidirectional device (527) comprises two ports, a first port is connected with a second port of the ninth unidirectional device (526), and a second port of the tenth unidirectional device (527) is connected with a third port of the second circulator (518) and is used for ensuring unidirectional transmission of a downlink signal sent from the bluetooth comprehensive tester;
the industrial control computer is specifically used for controlling the first movable contact (1) to be connected with the second fixed contact (12), the third movable contact (3) to be connected with the second normally closed contact (NC2), the second movable contact (2) of the second switch (K6) to be connected with the first normally open contact (NO1) when the strength of a downlink signal received by an antenna port of equipment to be tested is lower than the preset signal strength in a preset radio frequency test project, and testing frequency domain or time domain projects on a transmitter of the equipment to be tested.
7. The bluetooth device radio frequency test system of claim 6, wherein the radio frequency switch box further comprises: and the third radio frequency test path is used for connecting the Bluetooth comprehensive tester and the vector signal generator with the equipment to be tested and testing the radio frequency anti-interference C/I project of the receiver of the equipment to be tested.
8. The bluetooth device radio frequency test system of claim 7, wherein the third radio frequency test path comprises:
a fourth test port (512), a first port of the fourth test port (512) being connected to an output of the vector signal generator;
a sixth isolator (523), a first port of the sixth isolator (523) is connected with a second port of the fourth test port (512), and is used for ensuring that the vector interference signal sent from the vector signal generator is transmitted in a single direction;
a fifth one-way device (522), wherein a first port of the fifth one-way device (522) is connected with a second port of the sixth one-way device (523) and is used for ensuring that the vector interference signal sent from the vector signal generator is transmitted in a single direction;
a second port of the fifth one-way coupler (522) is connected with a third port of the first combiner (529), and the first combiner (529) is used for combining the vector interference signal with a downlink signal sent from the bluetooth comprehensive tester in a single direction;
the industrial control computer is used for controlling the first movable contact (1) to be communicated with the second fixed contact (12), the second movable contact (2) to be communicated with a first normally open contact (NO1) of a second switch (K6), a third movable contact (3) of a third switch (K2) to be communicated with a second normally closed contact (NC2), and a receiver of a device to be tested is tested for a radio frequency anti-interference C/I project.
9. The bluetooth device radio frequency test system of claim 8, wherein the radio frequency switch box further comprises: and the fourth radio frequency test path is used for connecting the Bluetooth comprehensive tester, the vector signal generator and the analog signal generator with the equipment to be tested and testing intermodulation items of the receiver of the equipment to be tested.
10. The bluetooth device radio frequency test system of claim 9, wherein the fourth radio frequency test path comprises:
a third test port (511), a first port of the third test port (511) being connected to an output of the analog signal generator;
a fourth switch (K3) comprising: a fourth movable contact (4), a third normally closed contact (NC3) and a third normally open contact (NO 3); the fourth movable contact (4) is connected with the second port of the third test port (511);
the first port of the eighth isolator (525) is connected with the third normally closed contact (NC3) of the fourth switch (K3) and is used for ensuring the unidirectional transmission of the single-frequency interference signal transmitted from the analog signal generator;
a seventh one-way device (524), wherein a first port of the seventh one-way device (524) is connected with a second port of the eighth one-way device (525) for ensuring the single-frequency interference signal transmitted from the analog signal generator to be transmitted in one direction;
a second port of the seventh one-way coupler (524) is connected with a fourth port of the first combiner (529), and the first combiner (529) is used for combining the single-frequency interference signal, the vector interference signal and a downlink signal sent from the bluetooth comprehensive tester in a single direction;
the industrial control computer machine is used for controlling the first movable contact (1) to be communicated with the second fixed contact (12), the second movable contact (2) to be communicated with a first normally open contact (NO1) of the second switch, the third movable contact (3) of the third switch to be communicated with a second normally closed contact (NC2), and the fourth movable contact (4) of the fourth switch to be communicated with a third normally closed contact (NC3), so that a receiver of a device to be tested is tested for intermodulation items.
11. The bluetooth device radio frequency test system of claim 10, wherein the radio frequency switch box further comprises: and the fifth radio frequency test path is used for connecting the Bluetooth comprehensive tester and the analog signal generator with the equipment to be tested and testing the radio frequency anti-interference blocking item of the receiver of the equipment to be tested.
12. The bluetooth device radio frequency test system of claim 11, wherein the fifth radio frequency test path comprises:
the second combiner (517) comprises three ports, and a first port of the second combiner (517) is connected with a third stationary contact (13) of the first switch (K9) and is used for combining a single-frequency interference signal sent by the analog signal generator with a downlink signal sent from the bluetooth comprehensive tester in a single direction;
a second attenuator (528), a first port of the second attenuator (528) is connected with a second port of the second combiner (517), and a second port of the second attenuator (528) is connected with a second normally open contact (NO2) of the third switch (K2);
a first port of the first attenuator (527) is connected with a third port of the second combiner (517) and used for link impedance matching;
a fifth switch (K4) comprising: a fifth movable contact (5), a fourth normally closed contact (NC4) and a fourth normally open contact (NO 4); the fifth movable contact (5) is connected with the second port of the first attenuator (527);
the sixth switch (K5) includes: a sixth movable contact (6), a fifth normally closed contact (NC5), and a fifth normally open contact (NO 5); a fifth normally closed contact (NC5) is connected with a fourth normally closed contact (NC4) of a fifth switch (K4), and the sixth movable contact (6) is connected with a third normally open contact (NO3) of the fourth switch (K3);
the industrial control computer is used for controlling a first movable contact (1) of the first switch (K9) to be communicated with a third fixed contact (13), a second movable contact (2) of the second switch (K6) to be communicated with a first normally-open contact (NO1), a third movable contact (3) of the third switch (K2) to be communicated with a second normally-open contact (NO2), a fourth movable contact (4) of the fourth switch (K3) to be communicated with a third normally-open contact (NO3), a fifth movable contact (5) of the fifth switch (K4) to be communicated with a fourth normally-closed contact (NC4), a sixth movable contact (6) of the sixth switch (K5) to be communicated with a fifth normally-closed contact (NC5), and a fourth contact (NC4) to be communicated with a fifth normally-closed contact (NC5), and a receiver of the equipment to be tested is tested for intermodulation items.
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