CN202334542U - System for automatically testing radio frequency index of digital trunking equipment - Google Patents

Abstract

The utility model discloses an automatic test system for radio frequency indicators of digital cluster equipment. The test computer platform is connected to a vector signal generator 1 through a network cable and a control line, connected to a vector signal generator 2 through a network cable and a control line, and controlled by USB to GPIB. The cable is connected to the spectrum analyzer, and the cluster device under test is connected through the network cable; the two vector signal generators are connected to the duplexer; when the receiver of the cluster device under test is tested, the RF interface of the cluster device under test is connected to the duplexer. When the transmitter is used, the radio frequency interface of the cluster equipment under test is connected to the spectrum analyzer through an attenuator; this scheme selects a test instrument with an acceptable configuration, and uses a test computer to connect multiple discrete test instruments to form a test that can automatically execute instructions The system mainly controls the whole test process by the test computer, and only needs one tester to participate in parameter selection at the test computer, so that the tester and time can be reduced.

Description

Automatic Test System for Radio Frequency Index of Digital Trunking Equipment

technical field

The utility model relates to the technical field of digital cluster equipment testing, in particular to an automatic test system for radio frequency indicators of digital cluster equipment.

Background technique

The digital trunking communication system is a mobile communication system developed in the 1980s for advanced special dispatching occasions, referred to as the trunking communication system. Mainly for various professional departments, such as public security, railway, water conservancy, municipal administration, emergency rescue and disaster relief, military and so on.

The RF index test of the trunking system is a key stage in the development and production process. In this stage, it is necessary to test and verify the radio frequency indicators of the transmitter and receiver. The original general test methods for analog trunking communication systems use multiple discrete test instruments and manually operate each test instrument. The test time is long and many people need to participate in the test. Moreover, because the test instruments used are not uniform enough, they will also introduce different errors. Most of the current trunking communication systems are realized by digital technology. Due to the difference between the digital system and the analog system, many original analog trunking test methods are no longer applicable.

Utility model content

In view of this, the utility model provides an automatic test system for radio frequency indicators of digital trunking equipment. The solution can reduce test personnel, shorten test time, and be flexible in use.

An automatic test system for radio frequency indicators of digital trunking equipment, including: test computer platform, vector signal generator 1, vector signal generator 2, duplexer, attenuator and spectrum analyzer; two vector signal generators adopt acceptable The vector signal generator of the external data file, the vector signal generator 1 is used as the useful signal source, and the vector signal generator 2 is used as the interference signal source;

The external interface of the test computer platform includes a network port and a USB interface. The test computer platform is connected to the vector signal generator 1 through the network cable W1 and the USB-to-serial control line C1, and the vector signal generator 2 is connected to the network cable W2 and the USB-to-serial control line C2 Connect the spectrum analyzer through the control line C3 of the USB to the general interface bus GPIB, and connect the network port of the cluster device under test through the network cable W3; two vector signal generators are connected to the duplexer; when testing the receiver of the cluster device under test , the radio frequency interface of the cluster device under test is connected to a duplexer, and when the transmitter of the cluster device under test is tested, the radio frequency interface of the cluster device under test is connected to a spectrum analyzer through an attenuator.

Beneficial effect:

This scheme selects test instruments with acceptable configurations, and uses a test computer to connect multiple discrete test instruments to form a test system that can automatically execute instructions. During the test, the entire test process is mainly controlled by the test computer, and only one test is required. Personnel are less involved in parameter selection at the test computer, reducing test personnel and time.

Description of drawings

Fig. 1 is a connection schematic diagram of the automatic test system of the radio frequency index of the digital trunking equipment of the present invention.

Figure 2 is a schematic diagram of the test computer platform.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and examples.

The utility model provides an automatic test scheme for radio frequency indicators of digital cluster equipment. The scheme selects test instruments with acceptable configurations, and uses a test computer to connect multiple separate test instruments to form a test system that can automatically execute instructions. During the test, the entire test process is mainly controlled by the test computer, and only one tester is required to participate in the selection of parameters at the test computer, thereby reducing the test time. Moreover, the utility model can generate a standard test signal source of a specified burst format for a special project, thereby enlarging the use flexibility of the test system of the utility model.

Fig. 1 is the connection schematic diagram of the automatic test system of the utility model digital trunking equipment radio frequency index, as shown in Fig. 1, this system comprises test computer platform, vector signal generator 1, vector signal generator 2, duplexer, attenuator and spectrum analyzer. The two vector signal generators use a signal generator that can accept external data files, such as Agilent's E4438C, where vector signal generator 1 is used as a useful signal source, and vector signal generator 2 is used as an interference signal source. The spectrum analyzer adopts a configurable spectrum analyzer, such as Agilent's E4407B.

The external interface of the test computer platform includes at least a network port and a USB interface. The test computer platform is connected to the vector signal generator 1 through the network cable W1 and the USB-to-serial control line C1, and the vector signal generator is connected to the network cable W2 and the USB-to-serial control line C2 2. Connect the spectrum analyzer through the USB-to-GPIB control line C3, and connect the network port of the cluster device under test through the network cable W3; two vector signal generators are connected to the duplexer. When testing the receiver of the cluster device under test, the radio frequency interface of the cluster device under test is connected to a duplexer; when testing the transmitter of the cluster device under test, the radio frequency interface of the cluster device under test is connected to a spectrum analyzer through an attenuator. The IP addresses of the test computer platform, the two vector signal generators and the cluster device under test are set to the same network segment so that they can communicate normally.

The measured object of the utility model is a digital trunking device, which includes a transmitter, a receiver, a radio frequency interface and a network port, the transmitter module includes a coding module, a modulation module, and an up-conversion module, and the receiver module includes a down-conversion module Module, demodulation module, decoding module and sending module; the transmitter sends radio frequency signals through the radio frequency interface, and the receiver receives radio frequency signals through the radio frequency interface. Of course, radio frequency signals can also be sent and received through the air interface. The transmitter and receiver also receive configuration parameters through the network port.

Referring to Fig. 2, the internal functional modules of the test computer platform include: a receiver test unit, a transmitter test unit, a standard data source generation unit, an equipment control unit, and a bit error rate analysis unit;

The standard data source generation unit is used to generate standard data sources according to the test needs, and then convert them into data files conforming to the download format of the vector signal generator, and download the data files to the vector signal generator 1 and/or via the network cable W1/W2 Vector Signal Generator 2.

The receiver test unit is used to generate the configuration information of the vector signal generator required for the current test and the receiver in the cluster device under test according to the current receiver test items, and send the configuration information to the device control unit. The receiver test unit also adjusts configuration information and obtains test conclusions according to the bit error rate analysis results sent by the bit error rate analysis unit.

The specific configuration information of the vector signal generator can be selected according to the test requirements, which can include the RF output frequency, output amplitude, modulation mode, and output signal pattern of the vector signal generator, or the configuration if the standard signal source in the data file is used The information includes data file names, etc. The configuration information of the receiver includes receiving frequency, logical channel type and so on.

For example, when measuring some parameters, only one signal source is needed, then only the vector signal generator 1 is configured as a useful signal source generating device, and the vector signal generator 1 generates signals according to the standard data source in the data file; when When not only the useful signal source but also the interference simulation is needed, on the basis of configuring the vector signal generator 1 as the useful signal source, it is also necessary to configure the vector signal generator 2 to generate the interference signal. If the interference signal is more complex, you can also download the data file If it is relatively simple, you can directly use the existing data source in the vector signal generator.

At the same time, the receiver test unit also needs to configure various parameters of the cluster device under test to make it consistent with the configuration of the signal generator. The signal generated by the signal generator is mixed by the duplexer and then sent to the receiver of the cluster device under test. The receiver sends the processed data to the test computer platform through the network cable W3, and the bit error rate analysis unit performs bit error rate analysis. , the receiver test unit adjusts the configuration information of the vector signal generator according to the analysis conclusion of the bit error rate, so as to realize the adjustment of the bit error rate. When the bit error rate reaches a satisfactory value range, the test conclusion at this time can be obtained. This test method is suitable for testing radio frequency parameters such as static receiving sensitivity and intermediate frequency rejection.

The transmitter test unit generates configuration information of the spectrum analyzer and the transmitter in the cluster device under test according to the current transmitter test item, and sends the configuration information to the device control unit. Receive the data transmitted by the spectrum analyzer through the control line C3, and use the data to analyze the performance of the transmitter.

The equipment control unit is a module that specifically executes the configuration of each instrument, including the configuration function of the spectrum analyzer, the configuration function of the vector signal generator and the configuration function of the cluster device under test, and is used for configuration information from the receiver test unit and the transmitter test unit Configure its control object.

The bit error rate analysis unit, when the test computer platform executes the receiver test project, receives the data packet from the receiver in the test cluster device through the network cable W3, and compares it with the standard data source generated by the standard data source generation unit, so as to realize the bit error rate rate analysis, and send the bit error rate analysis result to the receiver test unit.

In summary, the above are only preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (3)

1. an automated test system of digital trunking equipment radio frequency index, the cluster equipment under test comprises transmitter, receiver, radio frequency interface and network port; It is characterized in that, this automated testing system comprises: test computer platform, vector signal generator ( 1), vector signal generator (2), duplexer, attenuator and spectrum analyzer; the two vector signal generators use a vector signal generator that can accept external data files, and the vector signal generator (1) is used as a useful signal source, the vector signal generator (2) is used as the interference signal source; The external interface of the test computer platform includes a network port and a USB interface. The test computer platform is connected to the vector signal generator (1) through the network cable W1 and the control line C1 of the USB to serial port, and the vector signal generator is connected to the network cable W2 and the control line C2 of the USB to serial port. Device (2), connected to the spectrum analyzer through the control line C3 of USB to GPIB, and connected to the network port of the cluster device under test through the network cable W3; two vector signal generators are connected to the duplexer; when testing the cluster device under test When testing the receiver of the cluster device under test, the radio frequency interface of the cluster device under test is connected to a duplexer. When testing the transmitter of the cluster device under test, the radio frequency interface of the cluster device under test is connected to a spectrum analyzer through an attenuator. 2. automated test system as claimed in claim 1, is characterized in that, described test computer platform comprises: receiver test unit, transmitter test unit, standard data source generation unit, equipment control unit, bit error rate analysis unit; The standard data source generating unit is used to generate standard data sources according to the test requirements, and then convert them into data files conforming to the download format of the vector signal generator, and download the data files to the vector signal generator (1) and/or vector signal generator through the network cable signal generator (2); The receiver test unit is used to generate the configuration information of the vector signal generator required for the current test and the receiver in the cluster device under test according to the current receiver test items, and send the configuration information to the device control unit; send the configuration information to the device control unit according to the bit error rate analysis unit Adjust the configuration information and obtain the test conclusion based on the result of the bit error rate analysis; The transmitter test unit, according to the current transmitter test items, generates the configuration information of the spectrum analyzer and the cluster device under test, and sends the configuration information to the device control unit; receives the data transmitted by the spectrum analyzer through the control line C3, and uses the data Perform transmitter performance analysis; A device control unit, including a spectrum analyzer configuration function, a vector signal generator configuration function and a cluster device under test configuration function, is used to configure corresponding objects according to the configuration information from the receiver test unit and the transmitter test unit; The bit error rate analysis unit, when the test computer platform executes the receiver test project, receives the data packet from the receiver in the test cluster device through the network cable w3, and compares it with the standard data source generated by the standard data source generation unit, thereby realizing bit error rate analysis, and send the bit error rate analysis result to the receiver test unit. 3. The system according to claim 1, characterized in that, the vector signal generator (1) and the vector signal generator (2) use Agilent's vector signal generator E4438C; the spectrum analyzer uses Agilent's E4407B Spectrum Analyzer. the

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