CN219302650U - Radio frequency test adapting device - Google Patents

Abstract

The utility model discloses a radio frequency test adapting device which comprises a switching adapting module, a back plate and a general control module, wherein the switching adapting module and the general control module are respectively spliced with the back plate through an LRM connector; the front side of the switching adapting module is provided with a plurality of test joints connected with the end to be tested, the switching adapting module comprises a high-power signal processing unit and a signal distribution unit, and the universal control module is respectively connected with the upper computer and the signal distribution unit; the signal distribution unit comprises a plurality of test branches, an electronic switch is arranged on each test branch, and the output end of each electronic switch is correspondingly connected with a test instrument; the left side and the right side of the universal control module are respectively provided with a plurality of SMA connectors and a J30J control port. The utility model separates the control circuit from the switch topology, so that the radio frequency adapting mechanism is more miniaturized and modularized, and has better practicability.

Description

Radio frequency test adapting device

Technical Field

The utility model belongs to the technical field of navigation management test equipment, and particularly relates to a radio frequency test adapting device.

Background

The main purpose of the present dual-utility detector is to perform function inspection and performance index quantitative detection on the JZXWYD machine in an airport or an aircraft overhaul factory, locate faults to the LRM level, and be used for the definite inspection and maintenance guarantee of the performance of each system controller of the aircraft. The radio frequency adapting mechanism of the dual-utility detector is mainly used for completing the construction of the test topology of the radio frequency channel of the product to be tested and the internal power frequency meter, amplitude-phase consistency test card and other devices. In order to simplify the form of the test topology, the radio frequency adaptive interface can be designed to be specially aimed at a certain type of product to be tested or all devices to be tested of a certain model, the universality of the radio frequency adaptive interface can be ensured as much as possible under the condition of volume permission, and when different products are tested, all test tasks can be completed without replacing the radio frequency adaptive interface or only replacing the radio frequency adaptive interface once. For the dual utility detector device to be instrumented, the rf adapter interface should be considered miniaturized and therefore not overly complex.

Disclosure of Invention

The utility model aims to provide a radio frequency test adapting device, which aims to realize modularized and miniaturized design, so that a connecting structure is concise and convenient, and the radio frequency test adapting device has better practicability.

The utility model is realized mainly by the following technical scheme:

the radio frequency test adapting device comprises a switching adapting module, a back plate and a general control module which are sequentially arranged from front to back, wherein the switching adapting module and the general control module are respectively inserted into the back plate through an LRM connector; the front side of the switching adaptation module is provided with a plurality of test joints connected with the end to be tested, the switching adaptation module comprises a high-power signal processing unit and a signal distribution unit, and the universal control module is respectively connected with the upper computer and the signal distribution unit; the high-power signal processing unit comprises a power combiner, a fixed attenuator, a first coaxial switch and a coupler which are sequentially connected from front to back, wherein the power combiner is used for receiving and synthesizing multipath antenna interface signals output by a product to be tested, the output ends of the first coaxial switch and the coupler are respectively connected with the signal distribution unit, the signal distribution unit comprises a plurality of test branches, an electronic switch is arranged on each test branch, and the output end of each electronic switch is correspondingly connected with a test instrument; the left side of the universal control module is provided with a plurality of SMA connectors and a J30J control port corresponding to a plurality of test instruments, and the right side is provided with a plurality of SMA connectors and a J30J control port corresponding to an external radio frequency adapter. The power supply is realized through the control port led out by the PXIe backboard, and the power supply can be controlled by the embedded controller, and the embedded controller is in the prior art, so that the description is omitted.

In order to better realize the utility model, further, the test instrument comprises an amplitude-phase consistency test card, an embedded controller, a power frequency meter and an exciter; the embedded controller is connected with a J30J control port on the left side of the universal control module; the left side of the universal control module is provided with 5 SMA connectors which are respectively an exciter interface, a power frequency meter interface, port1 and Port2 ports of the amplitude-phase consistency test card and a synchronous trigger Port.

In order to better realize the utility model, the right side of the universal control module is further externally provided with 5 SMA connectors, and the ports are respectively Port1 and Port2 ports of the amplitude-phase consistency test card, a special signal exciter Port, a power frequency meter Port and a triggering and controlling Port, and are used for controlling and interacting signals with an external radio frequency adapter.

To better implement the present utility model, further, the LRM connector includes a radio frequency port and a low frequency port; the radio frequency Port comprises a special signal exciter interface, a power frequency meter interface, a Port1 Port2 Port of the amplitude-phase consistency test card and a RS422 control signal Port; the low-frequency port comprises a synchronous trigger port, a radio frequency switch, a program controlled attenuator and a control signal port of a power amplifier.

In order to better realize the utility model, the high-power signal processing unit further comprises a second coaxial switch, the output end of the coupler is respectively connected with the signal distribution unit and the second coaxial switch, two circulators are connected in series between the coupler and the second coaxial switch, a program-controlled attenuator and a fixed attenuator are respectively connected in parallel between the adjacent circulators, and the second coaxial switch is respectively connected with the signal distribution unit and the exciter.

In order to better realize the utility model, the control module further comprises an FPGA, a universal serial bus and an interface conversion chip, wherein the FPGA is connected with a plurality of interfaces connected with the signal distribution unit through the universal serial bus, and the FPGA is connected with the upper computer through the interface conversion chip.

In order to better realize the utility model, the front side of the transfer adapting module is further provided with 8 test joints, namely the test joints of the upper antenna, the lower antenna, the sigma L, the sigma R, the delta L, the delta R, the omega L and the omega R signals. The test signals of the sigma L, the sigma R, the delta L, the delta R, the omega L and the omega R are processed by the fixed attenuators and then flow into the corresponding test branches.

The beneficial effects of the utility model are as follows:

(1) The utility model realizes miniaturization design, the conventional interface adapter is generally huge, the innovative design of the control interface is unified, the control circuit is separated from the switch topology, the radio frequency adaptation mechanism is more miniaturized and modularized, the internal topology of the radio frequency adaptation mechanism can be changed according to the test requirement, and the electronic switch and the coaxial switch are matched, so that the performance of the switch matrix is improved, and the volume of the switch matrix is reduced. The external part of the utility model adopts a universal control interface, can be quickly replaced in a plug-in mode, and has better practicability;

(2) The utility model adopts a modularized design idea, and is divided into a general control module and a switching adaptation module by functions, so that the universal control module and the switching adaptation module can be independently installed and debugged without mutual influence. Meanwhile, the universal interface design is adopted, so that the universal control module can be matched with different host radio frequency interfaces, the test of various types of products to be tested is met, and the universal control module has good practicability;

(3) The utility model divides the host radio frequency interface unit into two parts based on the distinction of the high-power signal and the low-power signal, the high-power part adopts the radio frequency coaxial switch, and the low-power part adopts the electronic switch, thereby greatly reducing the volume of the interface adapter and being beneficial to the miniaturization design of the interface adapter.

Drawings

FIG. 1 is a block diagram of the overall principle of the utility model;

FIG. 2 is a schematic diagram of the overall structure of the present utility model;

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a right side view of FIG. 2;

FIG. 5 is a top view of FIG. 2;

fig. 6 is a schematic structural diagram of an LRM connector;

FIG. 7 is a schematic diagram of a generic control module;

FIG. 8 is a left side view of FIG. 7;

FIG. 9 is a right side view of FIG. 7;

fig. 10 is a functional block diagram of a high power signal processing unit;

FIG. 11 is a functional block diagram of a signal distribution unit;

fig. 12 is a functional block diagram of a generic control module.

Wherein: 1-switching adaptation module, 2-general control module, 3-backplate.

Detailed Description

Example 1:

1-12, the radio frequency test adapting device comprises a switching adapting module 1, a back plate 3 and a general control module 2 which are sequentially arranged from front to back, wherein the switching adapting module 1 and the general control module 2 are respectively inserted into the back plate 3 through an LRM connector; the front side of the switching adaptation module 1 is provided with a plurality of test joints connected with a to-be-tested end, the switching adaptation module 1 comprises a high-power signal processing unit and a signal distribution unit, and the universal control module 2 is respectively connected with an upper computer and the signal distribution unit; the high-power signal processing unit comprises a power combiner, a fixed attenuator, a first coaxial switch and a coupler which are sequentially connected from front to back, wherein the power combiner is used for receiving and synthesizing multipath antenna interface signals output by a product to be tested, the output ends of the first coaxial switch and the coupler are respectively connected with the signal distribution unit, the signal distribution unit comprises a plurality of test branches, an electronic switch is arranged on each test branch, and the output end of each electronic switch is correspondingly connected with a test instrument; the left side of the universal control module 2 is provided with a plurality of SMA connectors and a J30J control port corresponding to a plurality of test instruments, and the right side is provided with a plurality of SMA connectors and a J30J control port corresponding to an external radio frequency adapter. The power supply is realized through the control port led out by the PXIe backboard 3, and the power supply can be controlled by the embedded controller, and the embedded controller and the PXIe backboard are both in the prior art, so that the description is omitted.

Preferably, the test instrument comprises a web consistency test card, an embedded controller, a power frequency meter and an exciter; the embedded controller is connected with a J30J control port on the left side of the universal control module 2; as shown in fig. 8, the left side of the universal control module 2 is provided with 5 SMA connectors, which are respectively an exciter interface, a power frequency meter interface, port1 and Port2 ports of the amplitude and phase consistency test card, and a synchronous trigger Port.

Preferably, as shown in fig. 7 and fig. 9, the right side of the universal control module 2 is externally provided with 5 SMA connectors, and is respectively a Port1 Port2 Port of the amplitude-phase consistency test card, a special signal exciter Port, a power frequency meter Port, a triggering and controlling Port, which are used for controlling and signal interaction with an external radio frequency adapter.

Preferably, as shown in fig. 6 and 7, the LRM connector includes a radio frequency port and a low frequency port; the radio frequency Port comprises a special signal exciter interface, a power frequency meter interface, a Port1 Port2 Port of the amplitude-phase consistency test card and a RS422 control signal Port; the low-frequency port comprises a synchronous trigger port, a radio frequency switch, a program controlled attenuator and a control signal port of a power amplifier.

Preferably, as shown in fig. 10, the high-power signal processing unit further includes a second coaxial switch, the output end of the coupler is connected with the signal distribution unit and the second coaxial switch respectively, two circulators are connected in series between the coupler and the second coaxial switch, a program-controlled attenuator and a fixed attenuator are connected in parallel between adjacent circulators respectively, and the second coaxial switch is connected with the signal distribution unit and the exciter respectively.

Preferably, as shown in fig. 12, the control module includes an FPGA, a universal serial bus, and an interface conversion chip, where the FPGA is connected with a plurality of interfaces connected with the signal distribution unit through the universal serial bus, and the FPGA is connected with the upper computer through the interface conversion chip.

Preferably, as shown in fig. 3, 8 test connectors are disposed on the front side of the adapting module 1, which are the test connectors of the upper antenna, the lower antenna, Σl, Σr, Δl, Δr, Ω L, Ω R signals, respectively. The test signals of the sigma L, the sigma R, the delta L, the delta R, the omega L and the omega R are processed by the fixed attenuators and then flow into the corresponding test branches.

The utility model realizes miniaturization design, the conventional interface adapter is generally huge, the innovative design of the control interface is unified, the control circuit is separated from the switch topology, the radio frequency adaptation mechanism is more miniaturized and modularized, the internal topology of the radio frequency adaptation mechanism can be changed according to the test requirement, and the electronic switch and the coaxial switch are matched, so that the performance of the switch matrix is improved, and the volume of the switch matrix is reduced. The external part of the utility model adopts a universal control interface, can be quickly replaced in a plug-in mode, and has better practicability.

Example 2:

as shown in fig. 1-5, the front part is a switching adapting module 1, the rear part is a universal control module 2, and the two modules are connected with each other by inserting an LRM connector into a back plate 3.

As shown in fig. 3, the front part of the adapting module 1 is provided with 8 test connectors corresponding to the radio frequency interfaces of the product to be tested one by one, and taking a radio frequency adapting interface of a certain type of host machine as an example, the radio frequency interface mainly comprises an upper antenna, a lower antenna, Σl, Σr, Δl, Δr, Ω L and Ω R of an N-type head.

The LRM connector at the rear end of the adapting module 1 is inserted into the backboard 3 and is interconnected with the rear universal control module 2 through the backboard 3, the left side of the universal control module 2 is provided with 5 SMA connectors and a J30J control port, the left side of the universal control module 2 is interconnected with the instrument module in the PXIe chassis, and the right side of the universal control module 2 is provided with 5 SMA connectors and a J30J control port, and the right side of the universal control module is interconnected with the external radio frequency adapter.

As shown in fig. 1, 10-12, the radio frequency adapting mechanism is mainly used for completing the detection of functions and performances of a traditional interrogator and a transponder, the radio frequency channel of the to-be-detected interrogator and transponder system is connected with devices such as a power frequency meter and an exciter through the radio frequency adapting mechanism to form a communication channel of the interrogator and the response and a test channel of transmitting parameters, the universal control module 2 is used for controlling radio frequency components such as a radio frequency switch and a program controlled attenuator to realize the detection of performances such as the interrogator and response functions, transmitting power, frequency, pulse parameters, receiving sensitivity, dynamic range, upper and lower antenna selection and the like of a to-be-detected product, and the adapting module 1 also has the capability of conditioning instrument signals or to-be-detected signals. The LRM connector at the rear is a universal control interface.

As shown in fig. 6 and 7, the connection Port of the LRM connector is mainly divided into a radio frequency part and a low frequency part, wherein the radio frequency part includes a dedicated signal exciter interface, a power frequency meter interface, an amplitude phase consistency test card Port1, an amplitude phase consistency test card Port2, and the like, and the low frequency part includes control signals of a synchronous trigger Port, a radio frequency switch, a program controlled attenuator, a power amplifier, and the like.

As shown in fig. 7-9, the universal control module 2 is interconnected with the rear adapting module 1 through the adapting backboard 3 by an LRM connector, the external interface thereof is composed of three parts, one part is the LRM connector and is mainly interconnected with the adapting module 1, and provides control signals for switches, attenuators and the like therein, and the external radio frequency signals output by the control signals are led into the internal measuring instrument of the detector; the left side is a universal interaction interface with an internal measuring instrument and an excitation instrument, and the right side is a connection port for interaction with an external radio frequency interface adapter.

The left side of the universal control module 2 mainly comprises an exciter interface, a power frequency meter interface, an amplitude and phase consistency test card Port1, an amplitude and phase consistency test card Port2, a synchronous trigger Port, an RS422 control signal and the like. The universal control module 2 interconnects Port1, port2 ports, a special signal exciter Port and a power frequency meter Port of the amplitude-phase consistency test card in the PXIe chassis, and simultaneously generates one path of synchronous trigger output to the amplitude-phase consistency test card to complete synchronous control, and the embedded controller can control the amplitude-phase consistency test card through RS422 on a J30J interface.

The universal control module 2 externally provides Port1, port2 ports, a special signal exciter Port, a power frequency meter Port and a triggering and controlling Port of the amplitude and phase consistency test card to control and interact signals with the external radio frequency adapter.

Example 3:

as shown in fig. 1-12, the radio frequency interface adapter adopts a modularized and miniaturized design idea, and is divided into two parts, namely a switching adapter module 1 and a general control module 2 according to the principle of function aggregation. The switching adaptation module 1 can be designed according to products to be tested of different models, the universal control module 2 has universality and wide compatibility, the universal control module and the universal control module are in butt joint through the LAM connector, and the testing requirements of the products to be tested of different models on the aspect of radio frequency interface adaptation can be met rapidly only by replacing the interface of the switching adaptation module 1 singly.

As shown in fig. 1 and 10-12, the working principle is as follows: after a multipath radio frequency signal (with larger general power) output by a secondary radar interrogation transponder (namely a product to be tested) is accessed into the switching adaptation module 1, a high-power signal processing unit carries out preprocessing operations such as power adjustment and synthesis on the signal, processes the signal into a signal with smaller power and then sends the signal into the signal distribution unit. The signal distribution unit receives the driving control signal of the universal control module 2, further synthesizes the preprocessed radio frequency signal, adjusts power, switches channels and the like to enable the signal strength to reach the optimal test range of the test instrument, sends the signal strength to the universal control module 2 through the board-to-board LAM connector, and leads the signal strength out to an instrument test interface for index test or forms an inquiry response loop. The universal control module 2 obtains external power supply and control bus through the LAM connector, receives the control command of the upper computer, generates a response control signal (generally discrete line) and a driving signal after protocol analysis processing, accesses the host adaptation interface through the on-board connector, and provides a plurality of paths of driving control signals and bus control signals in consideration of compatibility and applicability, so that the control requirements of the host adaptation interface with different complexity can be compatible to a great extent.

The adapting module 1: the internal of the device is divided into a high-power signal processing unit mainly comprising a coaxial device and a signal distribution unit mainly comprising chip-level devices such as an electronic switch and the like according to factors such as strength of signal power, attention degree of test items to signal phase and the like, and the high-power signal processing unit and the signal distribution unit are cascaded through a cable. Through reasonable advantage of utilizing chip device and coaxial device, the reliability of effectual improvement test channel reduces systematic error and the random error of introducing.

High-power signal processing unit: and a coaxial device with stronger power bearing capacity is selected for design so as to bear high-power radio frequency signals filled by the product to be tested. As shown in fig. 10, the multi-path antenna interface signals output by the product to be tested are synthesized into one path by the high-power combiner and then sent to the fixed attenuator for power adjustment, and the signal flow direction is controlled by the coaxial switch. When controlling the flow direction RF_X1, the small signal conditioning and distributing unit processes the flow direction RF_X1 and flows to the port2 of the vector network to perform S parameter test such as phase consistency. When the control flow is directed to the directional coupler, two paths of signals are output after coupling treatment. The low-power signal RF_X2 is sent to the low-signal conditioning distribution unit and finally is connected to the power frequency meter test port for power and frequency index test, and the high-power signal is connected to the exciter port for testing the interrogation response function, sensitivity, dynamic range and the like after being regulated by interrogation response loops with different attenuation amounts formed by the circulator, the program-controlled attenuator and the like. The omega signal conditioned by the small signal conditioning and distributing unit is introduced through the RF_X3 port, and can be gated with the exciter through the coaxial switch to form a test loop of the omega signal of the product to be tested.

A signal distribution unit: as shown in fig. 11, the signals subjected to the power pre-adjustment processing by the high-power signal processing unit are subjected to further power adjustment and distribution, and radio frequency chip devices such as an electronic switch, an attenuator, a circulator and the like are adopted, so that the radio frequency chip devices have weaker power bearing capacity, but are small in size, good in index repeatability and easy to integrate on a PCB, and meanwhile, the cable connection is reduced and the stability is improved. The signal distribution unit and the high-power synthesis attenuation unit are connected through a coaxial cable.

The strength of the signals preprocessed by the high-power signal processing unit is within the bearing capacity range of a common radio frequency chip device, the signals are distributed to corresponding test ports according to different test requirements through cascade design of a plurality of paths of electronic switches, and the signal strength is regulated to the optimal test condition of the instrument through the design of a power amplifier, a program-controlled attenuator and a fixed attenuator, so that the accuracy of test results is ensured.

General control module 2: as shown in fig. 12, the adapter module 1 and the interface controller adopt a separated structural design, and can control different radio frequency interface adapters through a universal control interface. The universal control module 2 is mainly composed of an FPGA main control chip and a peripheral circuit, multiple control interfaces such as RS422 are provided through interface conversion signals, the design of the peripheral drive circuit can generate multiple drive control signals, the coaxial switch, the program-controlled attenuator, the electronic switch circuit and the signal conditioning circuit in the host adaptation interface are controlled, and the control signal output port adopts a uniform universal definition design and can be adapted to different host radio frequency interfaces. The power management unit, the FPGA, and the interface conversion chip are all in the prior art, and therefore will not be described in detail.

Compared with the prior art, the utility model has the following advantages:

(1) the modularized design thought is adopted, and the function is divided into two parts of the universal interface control and the switching adaptation module 1, so that the universal interface control and the switching adaptation module can be independently installed and debugged without mutual influence. Meanwhile, the universal interface design is adopted, so that the universal control module 2 can be matched with different host radio frequency interfaces, and the test of various types of products to be tested is satisfied;

(2) supporting to carry out inquiry response function test on a product to be tested, and constructing a test loop for test items such as power, frequency, S parameter, amplitude phase consistency and the like;

(3) the port has strong power bearing capacity, can bear a secondary radar inquiry response signal which is not less than 70dBm, can be directly docked with a product to be tested, and does not need to carry out additional signal conditioning;

(4) based on the distinction of the high-power signal and the low-power signal, the host radio frequency interface is divided into two parts, the high-power part adopts a radio frequency coaxial switch, and the low-power part adopts an electronic switch, so that the volume of the interface adapter is greatly reduced, and the miniaturization design of the interface adapter is facilitated;

(5) according to the characteristics of the measured parameters of the signals to be measured, the channel with special requirements on the consistency of the amplitude and phase adopts the passive device design, so that the influence on the test of the consistency of the amplitude and phase is greatly reduced.

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present utility model fall within the scope of the present utility model.

Claims (7)

1. The radio frequency test adapting device is characterized by comprising a switching adapting module (1), a back plate (3) and a universal control module (2) which are sequentially arranged from front to back, wherein the switching adapting module (1) and the universal control module (2) are respectively spliced with the back plate (3) through an LRM connector; the front side of the switching adaptation module (1) is provided with a plurality of test joints connected with a to-be-tested end, the switching adaptation module (1) comprises a high-power signal processing unit and a signal distribution unit, and the universal control module (2) is respectively connected with an upper computer and the signal distribution unit; the high-power signal processing unit comprises a power combiner, a fixed attenuator, a first coaxial switch and a coupler which are sequentially connected from front to back, wherein the power combiner is used for receiving and synthesizing multipath antenna interface signals output by a product to be tested, the output ends of the first coaxial switch and the coupler are respectively connected with the signal distribution unit, the signal distribution unit comprises a plurality of test branches, an electronic switch is arranged on each test branch, and the output end of each electronic switch is correspondingly connected with a test instrument; the left side of the universal control module (2) is provided with a plurality of SMA connectors and a J30J control port corresponding to a plurality of test instruments, and the right side is provided with a plurality of SMA connectors and a J30J control port corresponding to an external radio frequency adapter.

2. The radio frequency test adapter device according to claim 1, wherein the test instrument comprises a web consistency test card, an embedded controller, a power frequency meter, an exciter; the embedded controller is connected with a J30J control port on the left side of the universal control module (2); the left side of the universal control module (2) is provided with 5 SMA connectors which are respectively an exciter interface, a power frequency meter interface and Port1 and Port2 ports of the amplitude and phase consistency test card, and synchronous triggering ports.

3. The radio frequency test adapter device according to claim 2, wherein the right side of the universal control module (2) is externally provided with 5 SMA connectors, and is respectively a Port1 Port2 Port, a special signal exciter Port, a power frequency meter Port, a triggering and controlling Port of the amplitude-phase consistency test card, which are used for controlling and signal interaction with an external radio frequency adapter.

4. The radio frequency test adapter device according to claim 2, wherein the LRM connector includes a radio frequency port and a low frequency port; the radio frequency Port comprises a special signal exciter interface, a power frequency meter interface, a Port1 Port2 Port of the amplitude-phase consistency test card and a RS422 control signal Port; the low-frequency port comprises a synchronous trigger port, a radio frequency switch, a program controlled attenuator and a control signal port of a power amplifier.

5. The radio frequency test adapting device according to any one of claims 1-4, wherein the high-power signal processing unit further comprises a second coaxial switch, the output end of the coupler is connected with the signal distribution unit and the second coaxial switch respectively, two circulators are connected in series between the coupler and the second coaxial switch, a program-controlled attenuator and a fixed attenuator are connected in parallel between adjacent circulators respectively, and the second coaxial switch is connected with the signal distribution unit and the exciter respectively.

6. The radio frequency test adaptation device according to claim 5, wherein the control module comprises an FPGA, a universal serial bus and an interface conversion chip, the FPGA is connected with a plurality of interfaces connected with the signal distribution unit through the universal serial bus, and the FPGA is connected with the upper computer through the interface conversion chip.

7. The radio frequency test adaptation device according to claim 1, wherein 8 test joints are provided on the front side of the adapting module (1), which are the test joints of the upper antenna, the lower antenna, Σl, Σr, Δl, Δr, Ω L, Ω R signals, respectively.

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