CN116223942A - Flexible comprehensive avionics system - Google Patents

Abstract

The invention discloses a flexible integrated avionics system, which comprises a host radio frequency adaptive interface, a PXIe backboard, an embedded controller, a signal exciter, a amplitude phase consistency test card, a power frequency meter and a universal control interface card, wherein the PXIe backboard is respectively connected with the universal control interface card, the amplitude phase consistency test card, the power frequency meter and the embedded controller, and the host radio frequency adaptive interface is respectively connected with equipment to be tested, the amplitude phase consistency test card, the power frequency meter, the signal exciter and an external radio frequency adapter; the universal control interface card is connected with the equipment to be tested through the universal control interface; the host radio frequency adaptive interface is used for constructing a test topology. The invention realizes modularized design, and each component module of the device can be rapidly assembled and disassembled and is flexibly matched so as to realize functional inspection and quantitative test of performance indexes of different products to be tested; and the standardization and miniaturization of the host radio frequency adaptive interface are realized.

Description

Flexible comprehensive avionics system

Technical Field

The invention belongs to the technical field of avionics systems, and particularly relates to a flexible comprehensive avionics system.

Background

Avionics system (dual utility meter device) is mainly used for performing functional inspection and main performance index depth detection of the product to be tested, and its contents include: interrogation response working mode detection, emission working frequency detection, emission peak power detection, emission pulse envelope detection, receiving decoding sensitivity detection, receiving dynamic range detection, multichannel S parameter test, interface function detection and the like. The dual-utility detector device is used for carrying out function inspection and performance index quantitative detection on the JZXWYD machine in an equipment site or laboratory, can locate faults to an LRM (line-to-line) level, and is used for the fixed inspection and maintenance guarantee of the device. At present, a plurality of in-house detectors of airborne equipment are arranged in China, and various detectors are designed according to non-labeling equipment due to the differences of airplane types and the differences of various control equipment, so that various detectors are in various structures. Particularly, with the technical development of the aviation field, the functions to be completed of each subsystem control box are more and more, the intelligent degree required to be provided by each subsystem control box is more and more, the control logic is complex, the channel number and the control mode are factors, and the desk type instrument or the modularized instrument and the switch matrix are large, so that the universality of the test system is low and the size is huge.

For portable infield detector equipment, each time a detector is developed, the box body of the detector needs to be redesigned according to an internal circuit, so that the design time is prolonged, the development cost is increased, the appearance of the infield detector is various, the internal layout is different, the later maintenance and management are quite difficult, the installation condition is harsh, the disassembly is complicated, the structure is complex, and the practicability, the reliability, the mobility and the maintainability are reduced. The traditional internal field detector equipment can not meet the requirements of intelligent digital controller performance detection and external field severe test environments. In order to meet the technical performance detection requirements of the ground protection equipment of the new generation of aircraft, the new generation of avionic system is necessarily required to have high reliability, is convenient to maintain and move, is convenient to connect, and has outfield working capacity; advanced performance, flexibility, modularity, and scalability are needed to design highly stable, highly reliable integrated avionics systems.

Disclosure of Invention

The invention aims to provide a flexible integrated avionics system, which aims to solve the problems.

The invention is realized mainly by the following technical scheme:

the flexible integrated avionics system comprises a host radio frequency adaptive interface, a PXIe backboard, an embedded controller, a signal exciter, a amplitude consistency test card, a power frequency meter and a universal control interface card, wherein the PXIe backboard is respectively connected with the universal control interface card, the amplitude consistency test card, the power frequency meter and the embedded controller, and the host radio frequency adaptive interface is respectively connected with equipment to be tested, the amplitude consistency test card, the power frequency meter, the signal exciter and an external radio frequency adapter; the universal control interface card is connected with the equipment to be tested through the universal control interface; the host radio frequency adaptive interface is used for constructing a test topology and comprises a host adaptive interface unit and a universal switch control module, wherein the universal switch control module is respectively connected with the embedded controller and the external radio frequency adapter; the host adaptation interface unit comprises a high-power signal synthesis attenuation unit and a small-signal distribution conditioning unit, wherein the high-power signal synthesis attenuation unit is connected with a product end to be tested and is connected with the universal switch control module through the small-signal distribution conditioning unit, the small-signal distribution conditioning unit is provided with a plurality of test branches, and the test branches are provided with electronic switches and are correspondingly connected with the amplitude-phase consistency test card, the power frequency meter and the signal exciter.

In order to better realize the invention, the high-power signal synthesis attenuation unit is further provided with an active combiner, a fixed attenuator, a first coaxial switch and a coupler corresponding to the product end to be detected, wherein the active combiner is used for receiving and synthesizing multipath antenna interface signals output by the product to be detected, the first coaxial switch is respectively connected with the small signal distribution conditioning unit and the coupler and used for outputting an RF_x1 signal to the small signal distribution conditioning unit, and the output end of the coupler is connected with the small signal distribution conditioning unit and used for outputting a power signal RF_x2 to the small signal distribution conditioning unit; the small signal distribution conditioning unit is correspondingly provided with an RF_X1 signal test branch and an RF_X2 signal test branch respectively, the RF_X2 signal test branch is connected with a third electronic switch, the third electronic switch is connected with a fourth electronic switch, and the fourth electronic switch is connected with a power frequency meter; the RF_X1 signal testing branch is connected with a fifth electronic switch, and the fifth electronic switch is connected with a vector network port2 port for phase consistency testing.

In order to better realize the invention, the high-power signal synthesis attenuation unit further comprises a first circulator, a second circulator and a second coaxial switch which are sequentially arranged from front to back, wherein a fixed attenuator and a program-controlled attenuator are connected between the first circulator and the second circulator in parallel; the output end of the coupler is also connected with a first circulator, the small signal distribution conditioning unit is correspondingly provided with an RF_X3 signal test branch circuit for outputting omega signals of products to be tested, the RF_X3 signal test branch circuit is sequentially provided with a third circulator and a fourth circulator, a program-controlled attenuator and a fixed attenuator are arranged in parallel between the third circulator and the third circulator, the fourth circulator is connected with a second electronic switch, and the second electronic switch is sequentially connected with an amplifier and a third electronic switch; the second coaxial switch is respectively connected with the RF_X3 signal test branch and the exciter.

In order to better realize the invention, the small signal distribution conditioning unit further comprises an external source test branch, wherein a ninth electronic switch is arranged on the external source test branch and is respectively connected with the fifth electronic switch and the eighth electronic switch, and a first N-FET switch, a second amplifier and a third amplifier are sequentially arranged between the eighth electronic switch and the ninth electronic switch.

In order to better realize the invention, the amplitude-phase consistency test card further comprises a port1 port, a port2 port, a transmitting module, a return module, a sampling circuit, a DDS signal source, a control circuit, a local oscillator and a clock circuit, wherein the sampling circuit is respectively connected with the transmitting module and the return module, the transmitting module comprises a first directional coupler and a second directional coupler which are sequentially connected from front to back, and a first mixer and a second mixer which are sequentially connected from front to back, the first directional coupler and the second directional coupler are respectively connected with the sampling circuit through the first mixer and the second mixer, and the second directional coupler is connected with the port1 port; the transmitting module comprises a third directional coupler, a fourth directional coupler, a third mixer and a fourth mixer, wherein the output end of the third directional coupler is connected with the fourth directional coupler, the third directional coupler and the fourth directional coupler are respectively connected with the sampling circuit through the third mixer and the fourth mixer, the third directional coupler is connected with a port2 port, the DDS signal source is respectively connected with the first directional coupler and the fourth directional coupler, and the local oscillator and the clock circuit are respectively connected with the first mixer and the fourth mixer.

In order to better realize the invention, the signal exciter further comprises a baseband signal processing unit and a radio frequency signal processing unit which are connected with each other, wherein the radio frequency signal processing unit comprises a radio frequency transmitting circuit, a power amplifying circuit, an antenna interface circuit and a radio frequency receiving circuit which are sequentially connected from front to back; the radio frequency receiving circuit comprises a second attenuator, a power divider, a second operational amplifier, a detector, a frequency source, a phase-locked loop, an attenuator, a filter, a first operational amplifier, a mixer and a filter which are sequentially connected from front to back, wherein the second attenuator is connected with the power divider, the power divider is respectively connected with the second operational amplifier and the detector, and the second operational amplifier is connected with the mixer through a band-pass filter; the second attenuator is connected with the antenna interface circuit, the detector is connected with the baseband signal processing unit, and the mixer is connected with the baseband signal processing unit through a filter.

In order to better realize the invention, the baseband signal processing unit comprises an FPGA, a micro control unit MCU, a digital signal processing module, a low-speed ADC, a high-speed ADC and a digital-to-analog converter which are connected with the FPGA, wherein the FPGA is connected with the embedded controller through a PXIe bus, the FPGA is connected with a radio frequency transmitting circuit through the digital-to-analog converter, the detector is connected with the low-speed ADC, and the mixer is connected with the high-speed ADC through a filter; the FPGA is connected with a GPS/BD receiver through a micro control unit MCU, and the GPS/BD receiver is connected with a GPS antenna.

In order to better realize the invention, the power frequency meter further comprises a high-speed acquisition circuit, a trigger circuit, a clock module, a radio frequency input and conditioning module, a detection circuit, a comparison circuit and a control circuit which are sequentially connected from front to back, wherein the control circuit is connected with the embedded controller through a PXIe bus; the high-speed acquisition circuit is respectively connected with the clock module, the radio frequency input and conditioning module, the detection circuit and the control circuit, and the control circuit is connected with the trigger circuit; the clock module is used for providing clock signals for the high-speed acquisition circuit, and the high-speed acquisition circuit is used for acquiring detection signals and intermediate frequency signals; the radio frequency input and conditioning module comprises a protection diode, a broadband SPDT switch, an attenuator, a radio frequency switch and a distributor which are sequentially connected from front to back, wherein the broadband SPDT switch is connected with the radio frequency switch; the output end of the distributor is respectively connected with a frequency conversion module and a detection circuit, the frequency conversion module is connected with a high-speed acquisition circuit, and the frequency conversion module is used for down-converting a signal to be detected into an intermediate frequency signal.

In order to better realize the invention, the frequency conversion module further comprises a program controlled attenuator, a first SPDT switch, a first power amplifier, a second SPDT switch, a high-pass filter, a mixer, a low-pass filter and a second power amplifier which are sequentially connected from front to back.

The beneficial effects of the invention are as follows:

(1) The invention realizes modular design, and each component module can be assembled and disassembled quickly and is matched flexibly so as to realize functional inspection and quantitative test of performance indexes of different products to be tested. And realizing a standard 3U PXIe embedded controller through the PXIe backboard. The system is based on a hybrid bus architecture taking an open PXIe bus as a main part, and organically combines all the component parts into a whole, so that the volume and weight of the equipment are reduced, the expandability and compatibility of the equipment are improved, the equipment is convenient to maintain and repair, and the application requirements of actual combat can be met. Meanwhile, as the control interface and the appearance structure of the host radio frequency adaptive interface are standardized, the host radio frequency adaptive interface can adapt to different products to be tested by changing different host radio frequency adaptive interfaces, and the flexibility of the detector in function is greatly enriched. Meanwhile, in order to meet the military use, the detector adopts a modularized design, and each module has the design of electromagnetic shielding, low-temperature starting, wide working temperature range, salt fog resistance and the like.

(2) The invention realizes the high integration and generalization of the control and measurement module. Through the induction summary of the common avionics interface of the equipment to be tested, a general control interface card is established by adopting a mode of a PXIe interface carrier plate and a function interface daughter card, the interfaces of the general control interface card cover various forms such as 1553B, ARINC429, discrete interfaces, high-speed serial ports and the like, and standard external interfaces are formed through mass connectors of a chassis panel, so that the general control interface card is suitable for different application scenes.

(3) The invention designs a universal power frequency meter and amplitude-phase consistency measuring card, which covers the test of the performance index of the common avionics equipment to be tested, and greatly reduces the volume and weight of the system. The amplitude-phase consistency test card is mainly used for amplitude-phase consistency test of the TR component and has the test functions of isolation, standing waves and the like. The signal exciter designed by the invention can realize encoding and decoding and function detection of communication signals of common avionics equipment in an on-line programming mode, for example: a, C, S and other modes of the secondary radar, TACAN, DME, VOR and the like.

(4) The invention realizes the standardization and miniaturization of the host radio frequency adaptive interface. The conventional interface adapter is generally huge in size, and the control circuit is separated from the switch topology, so that the host radio frequency adapter interface is miniaturized and modularized, the internal topology can be changed according to the test requirement, and the electronic switch and the coaxial switch are matched with each other, so that the performance of a switch matrix is improved, and the size of the switch matrix is reduced. The host radio frequency adaptive interface adopts a universal control interface outside, and can be quickly replaced in a plug-in mode.

Drawings

FIG. 1 is a block diagram of the overall principle of the avionics system of the present invention;

FIG. 2 is a functional block diagram of a universal interface control card;

FIG. 3 is a block diagram of the overall principle of a power frequency meter;

FIG. 4 is a schematic diagram of the RF input and conditioning module;

FIG. 5 is a schematic diagram of a frequency conversion module;

FIG. 6 is a schematic diagram of a clock module;

FIG. 7 is a schematic diagram of a detection module;

FIG. 8 is a schematic diagram of a high-speed acquisition circuit;

FIG. 9 is a schematic diagram of a comparison circuit;

FIG. 10 is a schematic diagram of a trigger circuit;

FIG. 11 is a schematic diagram of a control circuit;

FIG. 12 is a measurement flow chart of a power frequency meter;

FIG. 13 is a block diagram of the overall principle of a signal exciter;

fig. 14 is a functional block diagram of a baseband signal processing unit;

fig. 15 is a functional block diagram of a radio frequency signal processing unit;

FIG. 16 is a schematic diagram of the overall structure of a host RF adapter interface;

FIG. 17 is a schematic diagram of the overall structure of a host adapter interface unit;

FIG. 18 is a schematic diagram of a high power signal combining and attenuating unit;

FIG. 19 is a schematic diagram of the structure of a small signal distribution conditioning unit;

FIG. 20 is a schematic diagram of a generic switch control module;

fig. 21 is a schematic diagram of the structure of the web uniformity test card.

Detailed Description

Example 1:

the flexible integrated avionics system comprises a host radio frequency adaptive interface, a PXIe backboard, an embedded controller, a signal exciter, a amplitude consistency test card, a power frequency meter and a universal control interface card, wherein the PXIe backboard is respectively connected with the universal control interface card, the amplitude consistency test card, the power frequency meter and the embedded controller, and the host radio frequency adaptive interface is respectively connected with equipment to be tested, the amplitude consistency test card, the power frequency meter, the signal exciter and an external radio frequency adapter; the universal control interface card is connected with the equipment to be tested through the universal control interface; the host radio frequency adaptive interface is used for constructing a test topology and comprises a host adaptive interface unit and a universal switch control module, wherein the universal switch control module is respectively connected with the embedded controller and the external radio frequency adapter; the host adaptation interface unit comprises a high-power signal synthesis attenuation unit and a small-signal distribution conditioning unit, wherein the high-power signal synthesis attenuation unit is connected with a product end to be tested and is connected with the universal switch control module through the small-signal distribution conditioning unit, the small-signal distribution conditioning unit is provided with a plurality of test branches, and the test branches are provided with electronic switches and are correspondingly connected with the amplitude-phase consistency test card, the power frequency meter and the signal exciter.

Preferably, as shown in fig. 17-19, the high-power signal synthesis attenuation unit is provided with an active combiner, a fixed attenuator, a first coaxial switch and a coupler corresponding to a product end to be detected, the active combiner is used for receiving and synthesizing multipath antenna interface signals output by the product to be detected, the first coaxial switch is respectively connected with a small signal distribution conditioning unit and the coupler and used for outputting an rf_x1 signal to the small signal distribution conditioning unit, and the output end of the coupler is connected with the small signal distribution conditioning unit and used for outputting a power signal rf_x2 to the small signal distribution conditioning unit; the small signal distribution conditioning unit is correspondingly provided with an RF_X1 signal test branch and an RF_X2 signal test branch respectively, the RF_X2 signal test branch is connected with a third electronic switch, the third electronic switch is connected with a fourth electronic switch, and the fourth electronic switch is connected with a power frequency meter; the RF_X1 signal testing branch is connected with a fifth electronic switch, and the fifth electronic switch is connected with a vector network port2 port for phase consistency testing.

Preferably, as shown in fig. 17-19, the high-power signal synthesis attenuation unit further comprises a first circulator, a second circulator and a second coaxial switch, which are sequentially arranged from front to back, wherein a fixed attenuator and a program-controlled attenuator are connected in parallel between the first circulator and the second circulator; the output end of the coupler is also connected with a first circulator, the small signal distribution conditioning unit is correspondingly provided with an RF_X3 signal test branch circuit for outputting omega signals of products to be tested, the RF_X3 signal test branch circuit is sequentially provided with a third circulator and a fourth circulator, a program-controlled attenuator and a fixed attenuator are arranged in parallel between the third circulator and the third circulator, the fourth circulator is connected with a second electronic switch, and the second electronic switch is sequentially connected with an amplifier and a third electronic switch; the second coaxial switch is respectively connected with the RF_X3 signal test branch and the exciter.

The invention realizes modular design, and each component module can be assembled and disassembled quickly and is matched flexibly so as to realize functional inspection and quantitative test of performance indexes of different products to be tested. The invention realizes the standardization and miniaturization of the radio frequency adaptation interface of the radio frequency host. The conventional interface adapter is generally huge in size, and the control circuit is separated from the switch topology, so that the host radio frequency adapter interface is miniaturized and modularized, the internal topology can be changed according to the test requirement, and the electronic switch and the coaxial switch are matched with each other, so that the performance of a switch matrix is improved, and the size of the switch matrix is reduced. The external of the host radio frequency adaptive interface adopts a universal control interface, and can be quickly replaced in a plug-in mode.

Example 2:

a flexible comprehensive avionics system is shown in figure 1, and the system can be roughly divided into a host and an external radio frequency adapter in terms of a hardware structure, wherein the host comprises a case (comprising a display screen, a PXIe backboard, an external connector on the case such as a general control interface and the like), a PXIe test control extension comprising an embedded controller, a power frequency meter, a amplitude-phase consistency test card, a general control interface card, a signal exciter, a host radio frequency adapter interface, a direct current power supply and the like. The embedded controller is a core of the system, is a carrier of system software, provides serial port signals to control the instrument signal conditioning and switching module, and provides external interfaces such as display control, a functional keyboard, USB and the like; the power frequency meter mainly detects peak power, frequency and pulse parameters of the signal to be detected; the amplitude-phase consistency test card mainly completes the test of the S parameter of the equipment to be tested; the universal control interface card mainly provides serial ports and discrete line signals which interact with the equipment to be tested, can complete simple waveform display of intermediate signals of the equipment to be tested, and can complete control of the equipment to be tested; the direct current power supply mainly converts the power supply of the 28V direct current power supply into various paths of power supplies required by the PXIe backboard, supplies power for various test instruments, and simultaneously supplies power for an external module to be tested. Each module is interconnected with the PXIe backplane through a custom backplane connector.

Preferably, the chassis is a main body framework of each component in the instrument, provides mounting positions and interfaces for each component, and also provides interfaces for external equipment to be tested, power supply equipment and the like and man-machine exchange interfaces. The external control interface of the chassis adopts a mass connector or an aviation head connector to form a universal interface, and different devices to be tested are adapted through the switching of the external connector.

Preferably, the PXIe test control extension is designed into a universal PXIe hybrid slot architecture, and is provided with at least 8 slots, 1 system slot, 5 hybrid slots and 2 custom interface slots, and modules such as an embedded controller, a power frequency meter, a amplitude and phase consistency test card, a universal control interface card, a signal exciter, a fast-plug direct-current power supply and the like are respectively installed. The whole structure of the PXIe test control extension adopts a PXIe open industrial bus, and a PXIe expansion slot based slot is reserved for meeting the requirements of certain specific test projects, so that the third-party modularized instrument and equipment can be conveniently added, and the system can better adapt to wider test requirements.

Preferably, as shown in fig. 16-20, the host radio frequency adaptive interface mainly completes the construction of the test topology of the radio frequency channel of the product to be tested and the internal devices such as a power frequency meter, a amplitude-phase consistency test card and the like, and the internal devices mainly comprise radio frequency components such as a radio frequency coaxial switch, an attenuator, a functional device, a circulator and the like. 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. The host radio frequency adapter interface also has the function of switching interfaces such as a universal control interface card, a amplitude-phase consistency test card, a power frequency meter and the like to the external radio frequency adapter, and the host radio frequency adapter interface is controlled by the embedded controller through a control port (RS 422 and power supply) led out by the PXIe backboard.

Preferably, the embedded controller is based on a COMe standard form, and a PXIe carrier plate is designed by combining the requirements of each interface function of a chip, a PXIe bus and the like, so that the standard 3U PXIe embedded controller is realized. Preferably, the COMe core unit adopts a Loongson 2H processor with a Loongson, the processor adopts a MIPS 64R 2 kernel, and the CPU integrates VGA, LCD, PCI-E2.0, SATA 2, USB2.0 6, SPI, LPC, UART, I2C 2, NAND and other interfaces to support the Liunx, vxworks, reworks, android system.

Preferably, as shown in fig. 2, the universal control interface card is implemented by adopting a mode of a PXIe bus carrier plate and a function sub-card, and the implementation mode can flexibly implement functions of various universal buses, discrete lines, data acquisition and the like by replacing different function sub-cards, so that the universal control interface card has extremely strong expandability. The universal interface control card integrates the aviation buses such as 1553B, ARINC429 and the common discrete signals (locking signals, OC, TTL and the like) and CAN, RS422 and the like on a board card through summarizing the control interfaces of the common aviation equipment, and utilizes fewer resources to adapt more equipment to be tested.

Example 3:

the power frequency meter in this embodiment is optimized based on embodiment 1 or 2, and as shown in fig. 3-12, the power frequency meter mainly includes a radio frequency input and conditioning module, a clock module, a detection circuit, a comparison circuit, a high-speed acquisition circuit, a control circuit, a trigger circuit, a power module, and other circuit units. The clock module is used for providing local oscillation and power calibration signals for the radio frequency input and conditioning module and providing clock signals for the high-speed acquisition circuit; the radio frequency input and conditioning module is used for down-converting the carrier to be tested into an intermediate frequency signal and providing the intermediate frequency signal to the high-speed acquisition circuit, and is used for dividing the power of the radio frequency carrier signal and providing the divided power to the detection circuit; the detection circuit is used for dividing an input radio frequency signal into two paths after power detection, wherein one path is provided for the high-speed acquisition circuit to acquire and analyze power and pulse parameters, and the other path is provided for the comparison circuit to compare trigger levels; the high-speed acquisition circuit is controlled by the control circuit and is used for acquiring detection signals and intermediate frequency signals, and transmitting data to the embedded controller through the control circuit for statistical analysis and frequency estimation; the comparison circuit is used for transmitting the comparison result of the trigger level to the control circuit, and the control circuit controls the sampling time; the trigger unit is used for transmitting an external trigger signal into the control circuit, and the control circuit performs timing control of sampling according to the trigger signal; furthermore, the power supply module is used for supplying power to each circuit unit.

Preferably, as shown in fig. 4, the radio frequency input and conditioning module comprises a protection diode, a broadband SPDT switch, an attenuator, a radio frequency switch, and a power divider; the protection diode, the broadband SPDT switch, the attenuator and the radio frequency switch are sequentially connected, the broadband SPDT switch is connected with the radio frequency switch, and the radio frequency switch, the coupler and the power distributor are sequentially connected. The model of the protection diode is 0402ESDA-MLP1, the model of the broadband SPDT switch is MASK-002103-13630G, the model of the attenuator is FAC0606P, and the model of the radio frequency switch is PE42540.

Preferably, as shown in fig. 5, a0.1 output by the power divider implements down-conversion of the signal to be tested into an intermediate frequency signal through a frequency conversion module. The frequency conversion module comprises a program-controlled attenuator, an SPDT switch, a power amplifier, an SPDT switch, a high-pass filter, a mixer, a low-pass filter and a power amplifier, wherein the program-controlled attenuator is HMC624ALP4, the SPDT switch is HMC232ALP4, the power amplifier is SBB-3089, and the mixer is M1-0008.

Preferably, as shown in fig. 6, the clock module is mainly configured to generate Lo signals required by the radio frequency conditioning circuit and sampling clock signals required by the high-speed acquisition circuit, wherein the VCO output frequency range of PLL2 in HMC7044 is 2.4 ghz-3.2 ghz, and the clock signals fanned out by HMC7044 are multiplied by PLL chip ADF4355 to obtain the Lo signals required and DAC sampling clock signals B0.3.

Preferably, as shown in fig. 7, the detection circuit includes devices such as an attenuator, a power amplifier, a logarithmic detector, a sample-hold device, and an SPDT device, and is mainly used for detecting the radio frequency signal output by the radio frequency conditioning module, outputting a pulse envelope signal thereof, and performing acquisition analysis by the high-speed acquisition circuit, wherein the attenuator is PAT0510S, the amplifier is PHA-1+, the logarithmic detector is ADL5511, the sample-hold device is AD781, and the SPDT switch is NC7WV07P6X.

Preferably, as shown in fig. 8, the high-speed acquisition circuit is mainly used for completing data acquisition of radio frequency signals and detection signals, and is used for carrying out statistical analysis by the embedded controller so as to obtain high-precision spectrum estimation and measurement analysis of pulse envelope parameters, and the high-speed acquisition circuit adopts an analog-to-digital converter (ADC) as AD9208 and is a double-channel, 14bit and 3GSPS analog-to-digital converter.

Preferably, as shown in fig. 9, the comparing circuit is mainly used for setting a trigger level for the detection signal to generate a trigger signal, the trigger level is mainly generated by the AD5623, and after B0.5 is sent to the controller, the controller can flexibly generate a sampling trigger signal according to the requirement and the characteristics of the secondary radar.

Preferably, as shown in fig. 10, the trigger circuit is mainly used for receiving an external trigger signal and transmitting the external trigger signal to the controller for logic processing, and the main devices thereof include a protection diode 0402ESD-MLP1, a trigger 74LVCG132 and the like.

Preferably, as shown in fig. 11, the control circuit is mainly used for realizing control of various chips in the power frequency meter, reading sampling data, processing a trigger signal and other logic, transmitting the data to the embedded controller through a PCIe bus, and realizing information interaction with the embedded controller.

Preferably, as shown in fig. 12, the detected signal which can be received by the radio frequency input and conditioning module of the power frequency meter is a continuous radio frequency signal or a pulse modulation signal within-20 dBm to +20dBm, after the detected signal enters the power frequency meter, the detected signal firstly carries out power initial measurement through a large attenuation channel, after the approximate range of the input power is measured, the detected signal is selected to be divided into two paths through a power distributor, one path of the detected signal is sent to a mixer for down-conversion treatment, and the down-converted signal is sent to a high-speed acquisition module for data acquisition; the other path is sent to a detection circuit, the logarithmic detection module carries out accurate logarithmic detection on the signal to obtain a detection signal, in order to keep the pulse width and edge characteristics of the detected signal, the logarithmic detection module cannot change the envelope characteristics of the detected signal, and the detection signal is finally sent to a high-speed acquisition circuit to acquire and analyze the pulse envelope characteristics and the power level. The clock circuit provides local oscillation signals required by down-conversion for the radio frequency input and conditioning module and provides high-speed sampling clock signals for the high-speed acquisition circuit. The comparison circuit compares the set trigger level with the input detection signal to generate a required sampling trigger signal. The control circuit samples and reads the high-speed acquisition circuit through the signal transmitted by the comparison circuit or the external trigger circuit. The control circuit reads back and accumulates the acquired data, and then carries out the joint analysis of FFT and CZT algorithm by the embedded controller, and carries out high-precision estimation on the frequency of the signal through interpolation, correction algorithm such as correction.

Because the FFT algorithm has a fence effect, the frequency spectrum of a signal to be detected is changed from a continuous spectrum to a discrete spectrum due to limited sampling, the discrete spectrum appears at a position which is an integral multiple of the discrete spectrum, so that the actual spectrum is possibly blocked and lost, the spectrum resolution can be improved if the calculation point number of the FFT is increased, but the calculation point number of the FFT is properly increased in an accumulation mode due to the limitation of short-time pulse, and the basic principle of CZT is adopted on the basis that the unit circle on the Z plane can be locally sampled, namely, the spectrum analysis is carried out in a limited frequency range, namely, the spectrum analysis is carried out among a plurality of sampling points of the FFT on the unit circumference. The combined algorithm shows a local amplification wavelet processing idea, and can greatly improve the frequency spectrum resolution on the basis of increasing limited calculated amount, thereby improving the frequency measurement precision.

The power frequency meter is mainly used for measuring the power and the frequency of short-time pulses of navigation management equipment, and the power and the frequency of pulse carrier frequency are main parameters of a pulse system radar. The power frequency meter integrates the power and frequency measurement functions into a module, greatly reduces the volume of the system and is very beneficial to the miniaturization of the system. The invention realizes accurate measurement of the short-time pulse carrier frequency by high-speed acquisition and adopting signal processing algorithms such as FFT and CZT combined algorithm, interpolation correction method and the like. Meanwhile, aiming at the requirements of the universal radio frequency signal performance test of the navigation management equipment, the test of power and pulse parameters is integrated on the basis of frequency measurement, the high-speed acquisition of single pulses in various signal formats and the analysis test of the pulse parameters are realized through the signal processing and trigger control of secondary radars, DMEs, VORs and the like, and the measurement of the parameters such as the rising edge, the falling edge, the pulse width, the pulse interval, the top unevenness, the sequence unevenness and the like of the pulses can be flexibly completed.

Compared with the prior art, the power frequency meter has the following advantages:

1) The invention combines the frequency measurement principle of the spectrometer, compared with a desk type spectrometer and a power meter, reduces the test cost of the pulse carrier frequency and has the measurement precision similar to that of the desk type spectrometer; the frequency spectrum estimation algorithm is adopted, so that the method is not limited to a pulse modulation mode in the measurement of carrier frequency, and has a wider application range;

2) The invention combines the working principle of the desk type power meter, reduces the testing cost of pulse power compared with the desk type power meter, has the measuring precision similar to that of the desk type power meter, is matched with a flexible triggering mode, and can flexibly track the power characteristics of single pulse in the pulse train;

3) The invention adopts a method for collecting the detection signals at high speed and carrying out statistical analysis on the collected data, flexibly realizes the measurement capability of pulse parameters such as pulse width, pulse interval, rising edge, falling edge, pulse top unevenness, pulse sequence unevenness and the like, combines the understanding of the simulation of the signals to be detected, designs a corresponding triggering mode, and can flexibly observe any appointed pulse waveform;

4) The method combines the coding and decoding functions of the secondary radar, can flexibly generate the trigger signal according to the working mode of the secondary radar, and is convenient for independently analyzing any pulse power, frequency, pulse parameters and the like of the secondary radar;

5) The invention adopts the form of PXIe bus and 3U board card, is miniaturized and generalized in structure, is more beneficial to system integration and is beneficial to control and data transmission and processing of the power frequency meter through the embedded controller.

Other portions of this embodiment are the same as those of embodiment 1 or 2, and thus will not be described in detail.

Example 4:

the embodiment is optimized on the basis of any one of the embodiments 1-3, and the amplitude-phase consistency test card is mainly used for testing parameters such as amplitude-phase consistency, isolation, standing waves and the like among channels such as the TR component, and is custom designed for testing requirements such as the digital TR component.

As shown in fig. 21, the amplitude and phase consistency test card generates a frequency sweep signal or a fixed frequency signal through a DDS signal source, and optionally outputs the frequency sweep signal or the fixed frequency signal to the device to be tested through Port1 or Port2, and returns the amplitude and phase consistency test card through Port1 or Port2 after responding through the device to be tested. The amplitude-phase consistency test card down-converts the transmitting signal or the reflecting signal coupled by the directional coupler into an intermediate frequency signal through the mixer, and samples and analyzes the intermediate frequency signal through the sampling circuit, so that S parameters of the equipment to be tested are obtained. The local oscillator and clock circuit provides signals such as clocks and local oscillators for various chips in the amplitude-phase consistency test card, and can also receive external local oscillator signals for a mixer. The reference clock circuit provides a highly stable reference clock for the board card, and can also receive an external reference clock. The control circuit controls various chips in the board, reads sampling data of the AD chip and uploads the sampling data to the embedded controller through the PCIe bus.

The standing wave test is a single-channel test, and the standing wave ratio of the device to be tested is calculated by coupling the radio frequency signal emitted by the DDS with the radio frequency signal reflected by the device to be tested through the directional coupler and then carrying out sampling analysis.

The amplitude-phase consistency test is to send a radio frequency signal with a certain frequency to the equipment to be tested through the Port1, the equipment to be tested sends the signal after response back to the board card through the Port2, the board card sends the sent and received radio frequency signal to the sampling circuit for acquisition and analysis after coupling through the directional coupler, and accordingly the difference of the amplitude and the phase of the return channel and the transmitting channel is obtained, the return channels are switched one by one, and accordingly the consistency of the amplitude and the phase of the return channel is indirectly compared.

The isolation test is to send a radio frequency signal with a certain frequency to the device to be tested through the Port1, the device to be tested sends the responded signal back to the board card through the Port2, and the board card sends the sent and received radio frequency signal to the sampling circuit for acquisition and analysis after coupling the radio frequency signal through the directional coupler, so that the difference of the amplitudes of the return channel and the transmitting channel is obtained, and the isolation between the two channels is measured.

The main chip of the sampling of the amplitude phase consistency test card comprises: the model of the mixer is ADE-11X, the model of an AD chip adopted by the sampling circuit is ADS6445, and the model of the directional coupler is SCBD-10-63HP+.

Other portions of this embodiment are the same as any of embodiments 1 to 3, and thus will not be described in detail.

Example 5:

the present embodiment is optimized based on any one of embodiments 1 to 4, and as shown in fig. 13, the signal exciter is mainly divided into two major parts, namely a baseband signal processing unit and a radio frequency signal processing unit. The design idea of the signal exciter is based on a software radio idea and a general hardware architecture, and the functional performance detection of avionics equipment such as secondary radars and TACAN, DME, VOR is realized by means of embedded controller software configuration or FPGA program change and the like.

The invention can also receive GPS signals through the GPS antenna to generate the needed position and time information. As shown in fig. 14, the baseband signal processing unit of the invention mainly realizes the works of encoding, decoding and the like of signals such as inquiry, response and the like of a secondary radar through an FPGA, can receive a GPS signal and generate corresponding time, position and other information, and meanwhile, the baseband signal processing unit also realizes the information interaction with the embedded controller through a PXIe bus, so as to realize the control of the embedded controller on an exciter.

Preferably, as shown in fig. 14, the baseband signal processing unit is a core unit of the present invention, and needs to receive an instruction of the main control system to complete the functions of query, coding, analysis, statistics of response signals, etc., and the module uses a high-speed PXIe bus to communicate with a single board computer, so as to facilitate high-speed and large-scale data information transmission. Its main functions include:

a. The method comprises the steps of inquiring encoding and response decoding of an inquiring machine, inquiring decoding and response encoding of a response machine, simulating and receiving ADS-B broadcast signals, carrying out statistical analysis on the signals and the like;

b. the encryption and decryption algorithm of the module 4 and module 5 inquiry response data is carried out through the DSP, and the encrypted and decrypted data is sent to the FPGA for further processing through the EMIF bus;

encoding and decoding TACAN, DME and VOR signals;

d. and also has the function of a GPS/BD receiver.

The baseband signal processing unit has a plurality of operation modes:

(1) GPS receiver mode: the MCU receives the positioning information sent by the GPS/BD to generate CPR codes, and the FPGA reads CPR values for sending the position message information of the ADS-B.

(2) Interrogator mode: the digital signal processing module transmits A, C mode (ASK modulation), S mode (DPSK modulation), mode 4 and mode 5 (MSK modulation) interrogation signals, the transmission frequency is 190M, and the transmission power is less than or equal to 0dBm (programmable control); the response decoding is completed by using a baseband video signal (with low-speed AD) +FPGA.

(3) Transponder mode: the digital signal processing module sends A, C (ASK modulation) mode, S mode (ASK modulation), mode 4 and mode 5 (MSK modulation) response signals, the transmitting frequency is 190M, and the transmitting power is less than or equal to 0dBm (programmable control); the S mode query decoding is realized by using an intermediate frequency (with high-speed AD) +video (with low-speed AD) +FPGA (DPSK demodulation is realized by using the intermediate frequency and frame extraction is completed by the video), the A, C mode query decoding is realized by using the video+FPGA, and the mode 4 and mode 5 query decoding is realized by using the intermediate frequency (with high-speed AD) +FPGA+DSP.

(4) Interrogator transponder mode: the inquiry and response simulation can be performed simultaneously to form an inquiry response communication link.

(5) Signal simulation mode: the inquiry and response signals of A, C, S, modulo 4, modulo 5 and other modes can be simulated.

(6) Signal analysis mode: the method can receive the inquiry and response signals of A, C, S, mode 4, mode 5 and the like, decode the signals and upload the signals to the embedded controller.

Preferably, as shown in fig. 13 and 15, the rf signal processing unit of the present invention mainly implements a function of conditioning an rf signal of an interrogation response, and mainly includes an rf receiving circuit, an rf transmitting circuit, a power amplifying circuit, an antenna interface circuit 4, and the like.

Radio frequency transmitting circuit: as shown in fig. 15, for receiving the intermediate frequency modulation signal 190MHz, modulating the bandwidth 12MHz, and up-converting it to 1030MHz/1090MHz 0.01MHz. The intermediate frequency signal is mixed with the Lo signal after being filtered, the signal after up-conversion is output after being filtered, and the chip model mainly used is as follows: phase locked loop HMC830, operational amplifier EAR-15M, mixer ADE-11X, etc.

A power amplifying circuit: as shown in fig. 15, the power amplifier is used for amplifying 1030MHz/1090MHz radio frequency signals sent by the radio frequency transmitting circuit to-20 dBm to +20dBm pulse power required by the output port. The chip model that it mainly used is: EAR-85M, GVA-91+ and the like.

Radio frequency receiving circuit: as shown in fig. 15, the device is used for receiving a radio frequency modulation signal 1030MHz/1090MHz, modulating bandwidth + -12 MHz, down-converting the modulation signal to a 190MHz intermediate frequency signal, and receiving dynamic range >65dB; has a function of detecting video signals by hardware, and sends the detected video signals to a baseband signal processing unit. The chip model used is as follows: phase locked loop HMC830, operational amplifier EAR-15M, mixer ADE-11X, operational amplifier EAR-35M, detector ADL5513, etc.

Antenna interface circuit: as shown in fig. 15, the antenna is used for matching with the transformation of a signal path in the radio frequency receiving and transmitting process through a circulator, and has the protection of burnout resistance and provides corresponding impedance matching and power supply for an antenna feeder system. The functional block diagram is shown below. The main chip types used are: circulator WH2525X-2.

The signal exciter can simulate a secondary radar interrogator, is controlled by the embedded controller through a PXIe bus, generates an IF signal for interrogation through the baseband signal processing unit, up-converts the IF signal into 1030MHz through the radio frequency signal processing unit, and sends various modes of interrogation signals to a product to be detected; meanwhile, the signal exciter can receive a response signal returned by the equipment to be tested through the radio frequency front end, and after down-conversion and detection processing, the signal is sent to the baseband signal processing unit for response decoding, and the decoding result is uploaded to the embedded controller for display and related processing.

The signal exciter can also simulate a secondary radar transponder, the radio frequency front end receives an interrogation signal of the interrogator to be detected, after the down-conversion treatment, the intermediate frequency and the video signal are sent to the baseband signal processing unit to carry out interrogation decoding, and corresponding response coding is carried out according to the decoding result and the configuration of the baseband signal processing unit by the embedded controller, and the coded intermediate frequency signal is sent to the interrogator to be detected after up-conversion to form an interrogation response loop.

Compared with the prior art, the signal exciter has the following advantages:

1) Based on the FPGA technology, the design complexity is greatly simplified based on the mature secondary radar inquiry response coding and decoding technology, and the miniaturized design of equipment is facilitated;

2) Based on the concept of software radio, on the basis of the existing hardware, the signal simulation of secondary radar, DME, VOR and other equipment can be flexibly realized by burning different IP cores;

3) The 3U standard board card design based on PXIe bus, which makes the equipment miniaturized and generalized, and is easy for system integration;

4) The method is combined with signal simulation application, is provided with a flexible configuration interface, and is convenient to cooperate with an embedded controller program to realize signal simulation of various application scenes.

Other portions of this embodiment are the same as any of embodiments 1 to 4, and thus will not be described in detail.

Example 6:

in this embodiment, optimization is performed on the basis of any one of embodiments 1 to 5, and as shown in fig. 16 to 20, a modularized and miniaturized design idea is adopted, so that a radio frequency host radio frequency adaptive interface is divided into a host adaptive interface unit and a general switch control module according to a principle of function aggregation. The host adaptation interface unit can be designed according to products to be tested of different models, the universal switch control module has universality and wide compatibility, the universal switch control module and the universal switch control module are in butt joint through the LRM connector, and the test requirements of the products to be tested of different models in the aspect of radio frequency interface adaptation can be met rapidly only by replacing the host adaptation interface independently.

Preferably, the host radio frequency adaptive interface mainly comprises two parts, wherein the front part is a host adaptive interface unit, the rear part is a universal switch control module, and the host radio frequency adaptive interface unit and the universal switch control module are connected with each other by inserting a module LRM connector into the backboard.

Preferably, the front part of the host radio frequency adaptive interface is in one-to-one correspondence with the radio frequency interfaces of the products to be tested by 8 host adaptive interface units, taking a certain type of host radio frequency adaptive interface as an example, the host radio frequency adaptive interface mainly comprises an upper antenna, a lower antenna, a sigma L, a sigma R, a delta L, a delta R, a omega L and a omega R of an N-type head.

Preferably, the host radio frequency adaptation interface unit: the device is divided into a high-power signal synthesis attenuation unit mainly comprising a coaxial device and a small signal distribution conditioning unit mainly comprising chip-level devices such as an electronic switch, and the high-power signal synthesis attenuation unit and the small signal distribution conditioning 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.

Preferably, the high power signal synthesis attenuation 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. 18, 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.

Preferably, the small signal distribution conditioning unit: as shown in fig. 19, the signals subjected to the power pre-adjustment treatment by the high-power signal synthesis attenuation unit are further subjected to 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 small signal distribution conditioning unit is connected with the high-power synthesis attenuation unit through a coaxial cable.

The strength of the signals preprocessed by the high-power signal synthesis attenuation 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 conditioned to the optimal test condition of the instrument through design of a power amplifier, a program-controlled attenuator and a fixed attenuator, so that the accuracy of test results is ensured.

Preferably, as shown in fig. 20, the universal switch control module: the control core is a control core of the radio frequency host radio frequency adaptive interface, the control core and the host radio frequency interface adopt a separated structural design, and the interface controller can control different radio frequency host radio frequency adaptive interfaces through a universal control interface. The universal switch control module 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 radio frequency host radio frequency adaptive interface can be applied to a test system aiming at a secondary radar interrogation transponder, the construction of a radio frequency test topology of equipment to be tested is completed, and an auxiliary test instrument realizes the test of index parameters such as the transmitting power, frequency, pulse parameters, receiving decoding sensitivity, receiving dynamic range, transmitting channel amplitude consistency, receiving channel amplitude consistency, sum and difference channel phase difference, sum and difference channel isolation, channel phase shift stepping, channel weighting stepping and the like of the equipment to be tested.

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 a host adaptation interface unit, a high-power signal synthesis attenuation unit is used for carrying out preprocessing operations such as power adjustment and synthesis on the signal, and the signal is processed into a signal with smaller power and then sent into a small signal distribution conditioning unit. The small signal distribution conditioning unit receives the driving control signal of the universal switch control module, 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 switch control module through the board-to-board LRM connector, and leads the signal strength to an instrument test interface for index test or forms an inquiry response loop. The universal switch control module obtains external power supply and control bus through the LRM connector, receives the control instruction of the embedded controller, 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, provides a multi-path driving control signal and bus control signal through the switch control module in consideration of compatibility and applicability, and can be largely compatible with the control requirements of host adaptation interfaces with different complexity.

Compared with the prior art, the host radio frequency adaptive interface has the following advantages:

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

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 host radio frequency adaptive interface is greatly reduced, and the miniaturized design of the host radio frequency adaptive interface 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.

Other portions of this embodiment are the same as any of embodiments 1 to 5, and thus will not be described in detail.

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

Claims (9)

1. The flexible integrated avionics system is characterized by comprising a host radio frequency adaptive interface, a PXIe backboard, an embedded controller, a signal exciter, a amplitude phase consistency test card, a power frequency meter and a universal control interface card, wherein the PXIe backboard is respectively connected with the universal control interface card, the amplitude phase consistency test card, the power frequency meter and the embedded controller, and the host radio frequency adaptive interface is respectively connected with equipment to be tested, the amplitude phase consistency test card, the power frequency meter, the signal exciter and an external radio frequency adapter; the universal control interface card is connected with the equipment to be tested through the universal control interface; the host radio frequency adaptive interface is used for constructing a test topology and comprises a host adaptive interface unit and a universal switch control module, wherein the universal switch control module is respectively connected with the embedded controller and the external radio frequency adapter; the host adaptation interface unit comprises a high-power signal synthesis attenuation unit and a small-signal distribution conditioning unit, wherein the high-power signal synthesis attenuation unit is connected with a product end to be tested and is connected with the universal switch control module through the small-signal distribution conditioning unit, the small-signal distribution conditioning unit is provided with a plurality of test branches, and the test branches are provided with electronic switches and are correspondingly connected with the amplitude-phase consistency test card, the power frequency meter and the signal exciter.

2. The flexible integrated avionics system according to claim 1, wherein the high-power signal synthesis attenuation unit is provided with an active combiner, a fixed attenuator, a first coaxial switch and a coupler corresponding to a product end to be tested, the active combiner is used for receiving and synthesizing multipath antenna interface signals output by the product to be tested, the first coaxial switch is respectively connected with the small signal distribution conditioning unit and the coupler and is used for outputting rf_x1 signals to the small signal distribution conditioning unit, and an output end of the coupler is connected with the small signal distribution conditioning unit and is used for outputting power signals rf_x2 to the small signal distribution conditioning unit; the small signal distribution conditioning unit is correspondingly provided with an RF_X1 signal test branch and an RF_X2 signal test branch respectively, the RF_X2 signal test branch is connected with a third electronic switch, the third electronic switch is connected with a fourth electronic switch, and the fourth electronic switch is connected with a power frequency meter; the RF_X1 signal testing branch is connected with a fifth electronic switch, and the fifth electronic switch is connected with a vector network port2 port for phase consistency testing.

3. The flexible integrated avionics system of claim 2 wherein the high power signal synthesis attenuation unit further comprises a first circulator, a second circulator, and a second coaxial switch arranged in sequence from front to back, wherein a fixed attenuator and a program controlled attenuator are connected in parallel between the first circulator and the second circulator; the output end of the coupler is also connected with a first circulator, the small signal distribution conditioning unit is correspondingly provided with an RF_X3 signal test branch circuit for outputting omega signals of products to be tested, the RF_X3 signal test branch circuit is sequentially provided with a third circulator and a fourth circulator, a program-controlled attenuator and a fixed attenuator are arranged in parallel between the third circulator and the third circulator, the fourth circulator is connected with a second electronic switch, and the second electronic switch is sequentially connected with an amplifier and a third electronic switch; the second coaxial switch is respectively connected with the RF_X3 signal test branch and the exciter.

4. A flexible integrated avionics system according to any one of claims 1-3, wherein the small signal distribution conditioning unit further comprises an external source test branch, a ninth electronic switch is disposed on the external source test branch, the ninth electronic switch is connected to a fifth electronic switch and an eighth electronic switch, and a first N-FET switch, a second amplifier, and a third amplifier are sequentially disposed between the eighth electronic switch and the ninth electronic switch.

5. The flexible integrated avionics system of claim 1 wherein the amplitude and phase consistency test card comprises a port1 port, a port2 port, a transmitting module, a returning module, a sampling circuit, a DDS signal source, a control circuit, a local oscillator and a clock circuit, wherein the sampling circuit is respectively connected with the transmitting module and the returning module, the transmitting module comprises a first directional coupler and a second directional coupler which are sequentially connected from front to back, and a first mixer and a second mixer which are sequentially connected from front to back, the first directional coupler and the second directional coupler are respectively connected with the sampling circuit through the first mixer and the second mixer, and the second directional coupler is connected with the port1 port; the transmitting module comprises a third directional coupler, a fourth directional coupler, a third mixer and a fourth mixer, wherein the output end of the third directional coupler is connected with the fourth directional coupler, the third directional coupler and the fourth directional coupler are respectively connected with the sampling circuit through the third mixer and the fourth mixer, the third directional coupler is connected with a port2 port, the DDS signal source is respectively connected with the first directional coupler and the fourth directional coupler, and the local oscillator and the clock circuit are respectively connected with the first mixer and the fourth mixer.

6. The flexible integrated avionics system of claim 1 wherein the signal exciter comprises a baseband signal processing unit and a radio frequency signal processing unit connected to each other, the radio frequency signal processing unit comprising a radio frequency transmitting circuit, a power amplifying circuit, an antenna interface circuit, and a radio frequency receiving circuit connected in sequence from front to back; the radio frequency receiving circuit comprises a second attenuator, a power divider, a second operational amplifier, a detector, a frequency source, a phase-locked loop, an attenuator, a filter, a first operational amplifier, a mixer and a filter which are sequentially connected from front to back, wherein the second attenuator is connected with the power divider, the power divider is respectively connected with the second operational amplifier and the detector, and the second operational amplifier is connected with the mixer through a band-pass filter; the second attenuator is connected with the antenna interface circuit, the detector is connected with the baseband signal processing unit, and the mixer is connected with the baseband signal processing unit through a filter.

7. The flexible integrated avionics system of claim 6 wherein the baseband signal processing unit comprises an FPGA and a micro control unit MCU, digital signal processing module, low speed ADC, high speed ADC, digital to analog converter connected to the FPGA, the FPGA connected to the embedded controller via PXIe bus, the FPGA connected to the radio frequency transmit circuit via digital to analog converter, the detector connected to the low speed ADC, the mixer connected to the high speed ADC via a filter; the FPGA is connected with a GPS/BD receiver through a micro control unit MCU, and the GPS/BD receiver is connected with a GPS antenna.

8. The flexible integrated avionics system of claim 1 wherein the power frequency meter comprises a high-speed acquisition circuit, a trigger circuit, and a clock module, a radio frequency input and conditioning module, a detection circuit, a comparison circuit, and a control circuit connected in sequence from front to back, wherein the control circuit is connected with an embedded controller through a PXIe bus; the high-speed acquisition circuit is respectively connected with the clock module, the radio frequency input and conditioning module, the detection circuit and the control circuit, and the control circuit is connected with the trigger circuit; the clock module is used for providing clock signals for the high-speed acquisition circuit, and the high-speed acquisition circuit is used for acquiring detection signals and intermediate frequency signals; the radio frequency input and conditioning module comprises a protection diode, a broadband SPDT switch, an attenuator, a radio frequency switch and a distributor which are sequentially connected from front to back, wherein the broadband SPDT switch is connected with the radio frequency switch; the output end of the distributor is respectively connected with a frequency conversion module and a detection circuit, the frequency conversion module is connected with a high-speed acquisition circuit, and the frequency conversion module is used for down-converting a signal to be detected into an intermediate frequency signal.

9. The flexible integrated avionics system of claim 8 wherein the frequency conversion module comprises a programmable attenuator, a first SPDT switch, a first power amplifier, a second SPDT switch, a high pass filter, a mixer, a low pass filter, and a second power amplifier connected in sequence from front to back.

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