Comprehensive simulation test system and test method for airborne radio frequency equipment

Abstract

The invention belongs to the technical field of airborne radio frequency equipment testing, and particularly relates to a comprehensive simulation test system and method for airborne radio frequency equipment, and the system comprises a man-machine interaction unit, a comprehensive radio frequency rack unit, a power supply and control unit, and a cabinet matching test cable. Broadband radio frequency signal processing, waveform modulation and demodulation, audio analysis processing and data storage and recording of each airborne radio frequency device are realized through the integrated radio frequency rack unit; and signal processing and channel switching functions are realized through the intermediate frequency switching matrix module and the broadband radio frequency front-end processing module, so that different to-be-tested systems and radio frequency signals can be matched. According to the invention, a software radio technology is adopted, a software dynamic loading reconstruction scheme is adopted on a general radio frequency hardware platform to realize soft switching among different task functions of the airborne radio frequency equipment, a comprehensive simulation test on the complex airborne radio frequency equipment is realized, and the utilization rate of test resources is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of airborne radio frequency equipment testing, and in particular relates to a comprehensive simulation test system and a test method for airborne radio frequency equipment. Background Art

[0002] Testability refers to a design feature that allows equipment to determine its working status (no fault, functional failure, performance degradation) in a timely and accurate manner and isolate its internal faults. Functional performance testing, as a test method to verify the working status of equipment, is an important part of the equipment testability verification and evaluation stage. The testability verification of avionics systems verifies the working status of the system in the testability test by performing functional performance testing on the developed equipment, thereby effectively verifying the system's fault detection and isolation capabilities in the event of functional failure or performance degradation.

[0003] Airborne RF equipment / systems are complex avionics equipment / systems with a high degree of functional integration and complex architecture. Existing test equipment has low hardware resource utilization and few universal test equipment. Therefore, studying a comprehensive simulation test system and test method for airborne RF equipment has important practical value for its testability design and verification. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a comprehensive simulation test system and test method for airborne radio frequency equipment, which adopts software radio technology and a software dynamic loading and reconstruction solution on a general radio frequency hardware platform to realize soft switching between different task functions of airborne radio frequency equipment, realize comprehensive simulation testing of complex airborne radio frequency equipment, and improve the utilization rate of test resources.

[0005] To achieve the above object, the present invention discloses the following technical solution:

[0006] A comprehensive simulation test system for airborne radio frequency equipment, comprising: a human-machine interaction unit, an integrated radio frequency rack unit, a power supply and control unit, and a cabinet supporting test cable;

[0007] The human-computer interaction unit realizes the control interface display of the comprehensive simulation test system, real-time reception of feedback status data, comprehensive simulation test system operation and voice data testing;

[0008] The integrated RF rack unit is composed of an intermediate frequency exchange matrix module and a broadband RF front-end processing module; the integrated RF rack unit can realize broadband RF signal processing, waveform modulation and demodulation, audio analysis and processing, and data storage and recording of each airborne RF device;

[0009] The intermediate frequency exchange matrix module is composed of a control submodule, an intermediate frequency processing submodule, a high-speed serial bus matrix exchange submodule, and a low voltage differential signal and discrete signal matrix exchange submodule; the intermediate frequency exchange matrix module can realize the routing exchange, filtering, amplification, gain detection and automatic gain control of intermediate frequency signals and digital signals between the universal receiving module, the universal excitation module, and the universal signal processing module;

[0010] The broadband RF front-end processing module is used to realize the channel switching function, realize the switching, amplitude adjustment, power detection, filtering and amplification functions of the external RF signal and the RF signal transmission in the integrated RF unit; the channel switching function is specifically realized by the RF function selection switch matrix, the U / V / L band transceiver channel, the C band transceiver channel, the multi-signal transceiver channel and the satellite communication transceiver channel combination; the channel switching function selects the U / V / L band transceiver channel, the C band transceiver channel, the multi-signal transceiver channel and the satellite communication transceiver channel through the RF function selection switch matrix; the RF function selection switch matrix is ​​mainly composed of 4 signal inputs and 4 signal outputs, forming a 1:1 signal switching path; each of the 4 signal inputs and 4 signal outputs contains a single-pole double-throw switch, the first branch of each single-pole double-throw switch is connected to realize the signal output port of the signal, and the second branch is switched to an 8-to-1 switch to realize spectrum power detection, and output the spectrum power detection signal data;

[0011] The power supply and control unit are used for output control of AC power supply, and power supply and output control of DC multi-channel adjustable power supply, which respectively power the human-machine interaction unit and the integrated radio frequency rack unit. The DC output is divided into four independent high-power adjustable power supplies, which respectively power the integrated radio frequency rack unit, and three external DC output power supplies;

[0012] The cabinet supporting test cable is used to realize the interconnection of electrical and communication interfaces among the human-machine interaction unit, the integrated radio frequency rack unit, and the control unit.

[0013] Preferably, the human-computer interaction unit is installed with host computer software for controlling and managing the comprehensive simulation test system of airborne radio frequency equipment, data recording and analysis software, and data management software; and is used to realize the control interface display of the comprehensive simulation test system, real-time reception of feedback status data, operation of the comprehensive simulation test system, and data testing functions.

[0014] Preferably, the integrated radio frequency rack unit further includes: a system control management module, a general signal processing module, a general receiving module, a general excitation module, a general broadband processing module, a local oscillator frequency source module, a power conversion module, a data storage and recording module and a satellite communication central station;

[0015] The system control and management module is used to implement the control and management functions of the multi-function, multi-mode digital radio;

[0016] The universal signal processing module is used to realize baseband digital signal processing including AD conversion, down-conversion, filtering, modulation, demodulation, spread spectrum, despreading, encoding, decoding, beam envelope processing and azimuth measurement of radio frequency signals, and can also complete frequency control and transceiver switching functions for related radio frequency channels;

[0017] The universal receiving module is used to realize frequency conversion processing of 8-channel radio frequency signals to analog intermediate frequency signals;

[0018] The universal excitation module is used to realize the change processing of the baseband I / Q signal in the 4-way working frequency band to the specified excitation signal;

[0019] The general broadband processing module is used to implement general communication, index testing of navigation functions and signal simulation of navigation functions;

[0020] The local oscillator frequency source module is used to provide multiple local oscillator signals required for frequency conversion;

[0021] The power conversion module is used to convert the DC power input by the power supply and control unit into the DC voltage required by the functional modules in the integrated radio frequency rack unit; the data storage and recording module is used to realize the storage and recording of the data of each bus interface;

[0022] The satellite communication center station is used to realize the intercommunication of satellite communication functions and support voice, synchronous data, asynchronous data and short message communication capabilities.

[0023] Preferably, the power supply and control unit includes a power supply and a control board, specifically:

[0024] The power supply is used to supply AC power to the computer in the human-machine interaction unit and the satellite communication center station in the integrated radio frequency rack unit. The DC output is divided into four independent high-power adjustable power supplies, which respectively supply power to the integrated radio frequency rack unit, and three external DC outputs;

[0025] The control panel is used to control the input of DC and AC voltages, the output of AC and DC voltages of each branch, and display the total power supply, the working status of each branch power supply, and the output terminal voltage and current value.

[0026] Preferably, the RF modules in the integrated RF rack unit select wide-band and large-dynamic devices and perform segmented processing according to different functional characteristics to broaden the frequency band of general RF, and select large-scale hardware platforms through general signal processing modules and system control and management modules to realize software embedding of multiple functions, signal modulation and demodulation, and system resource configuration management.

[0027] Preferably, the integrated radio frequency rack unit adopts a software radio architecture, and can freely switch the signal processing of functional waveforms on the hardware platform of the integrated simulation test system; and according to the test requirements, the function expansion and upgrade can be achieved by loading software.

[0028] Preferably, when the integrated simulation test system needs to run a certain function, the hardware resources related to this function are combined with the support of the radio frequency switch matrix and the high-speed data bus network to form a complete hardware channel link resource for completing the function from radio frequency channel, digital signal processing to data processing, and at the same time, by loading and running related test function software, a logical function is formed, thereby completing the processing of all radio frequency signals and digital signals of the function item;

[0029] The comprehensive simulation test system supports dynamic reconstruction and can be reconstructed according to tasks or external input commands; the reconstruction process is achieved under the control of the system control management module through dynamic loading of software and switching of radio frequency switches and logic switches.

[0030] Another aspect of the present invention provides a test method for a comprehensive simulation test system for airborne radio frequency equipment, which comprises the following steps:

[0031] S1: Build a comprehensive simulation test system; connect the external power supply, set the grounding terminal at the bottom of the cabinet, and connect the ground wire and the airborne RF device under test;

[0032] S2: Initialize the airborne RF device under test and the integrated simulation test system; put the button switches of the airborne RF device under test in the initial state, and put the control panel of the power supply and control unit of the integrated simulation test system in the off state;

[0033] S3: Start the integrated simulation test system for testing; start the integrated simulation test system for airborne radio frequency equipment, use the integrated simulation test system for airborne radio frequency equipment to control and manage the host computer software, input test parameters according to the test items, execute the test and feedback the test data;

[0034] S4: Generate a test report based on the calibration test data; compare the calibration test data with the index value. If all test results are qualified, the airborne RF device under test is qualified, otherwise the airborne RF device is unqualified; determine the qualification of the airborne RF device product, generate and store the test report.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) The present invention adopts an open integrated architecture for design, so that the airborne RF equipment comprehensive simulation test system can achieve standardization and generalization of hardware resources without reducing the functional performance of each sensor, that is, it is oriented to the test items of airborne RF equipment instead of specific equipment, so as to achieve the sharing of hardware resources.

[0037] (2) The system RF design of the present invention adopts a wide-band integrated design solution that can cover the frequency band requirements of all test items; the functional modules in the system should be standardized in design, with fast data throughput, good modular structure, and strong openness, and expansion margins should be reserved in both hardware and software to facilitate expansion and upgrading.

[0038] (3) The present invention can greatly improve the integration level of the test system for airborne radio frequency equipment, enhance the versatility of the test system, realize multi-functional integration, and can be used as a universal test system for airborne radio frequency equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a block diagram of the physical composition of the airborne radio frequency equipment comprehensive simulation test system of the present invention;

[0040] Figure 2 It is a principle block diagram of the integrated radio frequency rack of the present invention;

[0041] Figure 3 This is a diagram of actual use scenarios of the airborne radio frequency equipment comprehensive simulation test system of the present invention;

[0042] Figure 4 A pulse interval test connection diagram for testing the working function of the air collision avoidance system (TCAS) of the present invention;

[0043] Figure 5 A pulse interval test connection diagram for testing the working mode of the airborne collision avoidance system (TCAS) of the present invention;

[0044] Figure 6 It is a connection diagram for the operating frequency test of the air collision avoidance system (TCAS) of the present invention;

[0045] Figure 7 A block diagram of the height accuracy of the radio altimeter of the present invention;

[0046] Figure 8 The operating frequency range and accuracy block diagram of the radio altimeter of the present invention;

[0047] Fig. 9 The figure is a connection diagram of the altitude simulation test of the radio altimeter of the present invention. DETAILED DESCRIPTION

[0048] The exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0049] The embodiment of the present invention selects a certain airborne radio frequency device for testing and provides a comprehensive simulation test system for airborne radio frequency devices, such as Figure 1 As shown, it includes: a human-computer interaction unit, an integrated radio frequency rack unit, a power supply and control unit, and a cabinet-matching test cable.

[0050] The human-computer interaction unit in the embodiment of the present invention realizes the control interface display of the comprehensive simulation test system, real-time reception of feedback status data, operation of the comprehensive simulation test system and voice data testing; the human-computer interaction unit is installed with the comprehensive simulation test system control and management host computer software, data recording and analysis software, and data management software for airborne radio frequency equipment; it is used to realize the control interface display of the comprehensive simulation test system, real-time reception of feedback status data, operation of the comprehensive simulation test system and data testing functions.

[0051] The integrated radio frequency rack unit in the embodiment of the present invention is composed of an intermediate frequency exchange matrix module, a broadband radio frequency front-end processing module, a system control management module, a general signal processing module, a general receiving module, a general excitation module, a general broadband processing module, a local oscillator frequency source module, a power conversion module, a data storage recording module and a satellite communication center station; Figure 2 The figure shows the principle block diagram of the integrated radio frequency rack of the present invention; it can realize broadband radio frequency signal processing, waveform modulation and demodulation, audio analysis and processing, and data storage and recording of each airborne radio frequency device.

[0052] The intermediate frequency exchange matrix module in the integrated radio frequency rack unit in the embodiment of the present invention is composed of a control submodule, an intermediate frequency processing submodule, a high-speed serial bus matrix exchange submodule, and a low-voltage differential signal and discrete signal matrix exchange submodule; the intermediate frequency exchange matrix module can realize the routing exchange, filtering, amplification, gain detection and automatic gain control of intermediate frequency signals and digital signals between the universal receiving module, the universal excitation module and the universal signal processing module.

[0053] The broadband RF front-end processing module in the integrated RF rack unit in the embodiment of the present invention is used to realize the channel switching function, realize the switching, amplitude adjustment, power detection, filtering and amplification functions of the external RF signal and the RF signal transmission in the integrated RF unit; the channel switching function is specifically realized by the RF function selection switch matrix, the U / V / L band transceiver channel, the C band transceiver channel, the multi-signal transceiver channel and the satellite communication transceiver channel combination; the channel switching function selects the U / V / L band transceiver channel, the C band transceiver channel, the multi-signal transceiver channel and the satellite communication transceiver channel through the RF function selection switch matrix; the RF function selection switch matrix is ​​mainly composed of 4 signal inputs and 4 signal outputs, forming a 1:1 signal switching path; each of the 4 signal input ports and the 4 signal output ports contains a single-pole double-throw switch, the first branch of each single-pole double-throw switch is connected to realize the signal output port of the signal, and the second branch is switched to an 8-to-1 switch to realize spectrum power detection, and output the spectrum power detection signal data.

[0054] In the embodiment of the present invention, the U / V / L band transceiver channel is mainly composed of a switching switch, an amplitude adjustment, a transmitting switch filter group, a receiving switch filter group, an amplifier, a signal coupling detection and other functional modules, which realize the functions of transmitting and receiving bandpass filtering, amplitude control, and transmitting and receiving switching. After the transmitting excitation signal enters the channel, it is first digitally attenuated and amplified, and then enters the switch filter, and is filtered by a tuned filter and a bandpass filter in sections, and then undergoes multi-stage digital attenuation and amplification, and finally output to the RF function selection switch matrix through the transceiver selection switch. The receiving signal output by the RF function selection switch matrix passes through the digitally controlled attenuator, amplified, and digitally attenuated, and then enters the switch filter, and then is divided according to the working frequency band, and then combined into one path through the switch, and then divided into four paths for output through the amplifier.

[0055] In the embodiment of the present invention, the C-band transceiver channel is mainly composed of a transmitting channel and a receiving channel to realize filtering and amplitude adjustment functions. Both the transceiver channels contain frequency conversion and direct pass, which are switched by switches. After the transmitting excitation signal or the intermediate frequency signal enters the channel, it is first amplified by the amplifier, and then divided into two paths by the switch, respectively entering the direct pass branch and the up-conversion branch, and then the two signals are combined into one path by the switch. After the signal is combined by the switch, it is filtered, amplified, and multi-stage digitally controlled attenuated, and then output to the RF function selection switch matrix through the transceiver selection switch. The received RF signal output by the RF function selection switch matrix enters the receiving channel through the transceiver selection switch, first passes through the digitally controlled attenuator, and then after low-noise amplification and bandpass filtering, it is divided into two paths by the switch, respectively entering the direct pass branch and the down-conversion branch, and then the two signals are combined into one path through the switch to amplify and output the RF or intermediate frequency signal.

[0056] In the embodiment of the present invention, the multi-signal transceiver channel is mainly composed of a transmitting channel and a receiving channel, and does not include a frequency conversion device, so as to realize the switch switching and amplitude adjustment functions. The switches and all digitally controlled attenuators in the multi-signal transceiver channel use the same devices as the U / V / L transceiver channel.

[0057] In the embodiment of the present invention, the satellite communication transceiver channel mainly has the functions of receiving and amplifying, mixing, filtering, power division, local oscillation, etc., to realize the frequency conversion filtering function of the transceiver channel. After the transmitting intermediate frequency signal enters the channel, it is first amplified by the amplifier, then mixed and filtered, and output to the RF function selection switch matrix through the transceiver selection switch. The RF function selection switch matrix outputs the receiving RF signal, and after entering the receiving channel through the transceiver selection switch, it is first low-noise amplified, band-pass filtered, mixed and filtered, and then amplified to output the intermediate frequency signal.

[0058] The system control management module in the integrated radio frequency rack unit in the embodiment of the present invention is used to realize the control and management functions of multifunctional and multi-mode digital radio; the general signal processing module is used to realize baseband digital signal processing including AD conversion, down conversion, filtering, modulation, demodulation, spread spectrum, despreading, encoding, decoding, beam envelope processing and azimuth measurement of radio frequency signals, and can also complete frequency control and transceiver switching functions for related radio frequency channels; the general receiving module is used to realize frequency conversion processing of 8-channel radio frequency signals to analog intermediate frequency signals; the general excitation module is used to realize the change processing of baseband I / Q signals in 4 working frequency bands to designated transmission excitation signals; the general broadband processing module is used to realize index testing and signal simulation of general communication and navigation functions; the local oscillator frequency source module is used to provide multiple local oscillator signals required for frequency conversion; the power conversion module is used to convert the DC power input by the power supply and control unit into the DC voltage required by the functional modules in the integrated radio frequency rack unit; the data storage and recording module is used to realize the storage and recording of data of each bus interface; the satellite communication central station is used to realize the intercommunication of satellite communication functions and support voice, synchronous data, asynchronous data and short message communication capabilities.

[0059] The RF module in the integrated RF rack unit in the embodiment of the present invention selects wide-band and large-dynamic devices, and uses segmented processing according to different functional characteristics to broaden the frequency band range of general RF. It also selects a large-scale hardware platform through a general signal processing module and a system control and management module, and can realize software embedding of multiple functions, signal modulation and demodulation, and system resource configuration management.

[0060] The integrated radio frequency rack unit in the embodiment of the present invention adopts a software radio architecture, and can freely switch the signal processing of functional waveforms on the hardware platform of the integrated simulation test system; and according to the test requirements, the function expansion and upgrade can be achieved by loading software.

[0061] The power supply and control unit in the embodiment of the present invention includes a power supply and a control board; output control for AC power supply, and power supply and output control of a DC multi-channel adjustable power supply, which respectively power the human-machine interaction unit and the integrated radio frequency rack unit, and the DC output is divided into four independent high-power adjustable power supplies, which respectively power the integrated radio frequency rack unit, and three external DC output power supplies; the power supply is used to supply AC power to the computer in the human-machine interaction unit and the satellite communication center station in the integrated radio frequency rack unit, and the DC output is divided into four independent high-power adjustable power supplies, which respectively power the integrated radio frequency rack unit, and three external DC output power supplies; the control board is used to control the input of DC and AC voltages, the output of each branch AC and DC voltage, and display the total power supply, the working status of each branch power supply, and the output terminal voltage and current value.

[0062] The cabinet supporting test cable in the embodiment of the present invention is used to realize the interconnection of electrical and communication interfaces among the human-machine interaction unit, the integrated radio frequency rack unit, the power supply and the control unit.

[0063] like Figure 3 The figure shows the actual use scenario of the airborne radio frequency equipment comprehensive simulation test system of the present invention. When the comprehensive simulation test system in the embodiment of the present invention needs to run a certain function, the hardware resources related to this function are combined with the support of the radio frequency switch matrix and the high-speed data bus network to form a complete hardware channel link resource that completes the function from radio frequency channel, digital signal processing to data processing. At the same time, by loading and running the relevant test function software, a logical function is formed to complete the processing of all radio frequency signals and digital signals of the function item; the comprehensive simulation test system supports dynamic reconstruction, can be reconstructed according to the task, and can also be reconstructed according to the external input command; the reconstruction process is under the control of the system control management module, through the dynamic loading of software, and the switching of radio frequency switches and logic switches.

[0064] A second aspect of an embodiment of the present invention provides a testing method for a comprehensive simulation test system for an airborne radio frequency device, which comprises the following steps:

[0065] Step S1: Build a comprehensive simulation test system; connect an external power supply, set a grounding terminal at the bottom of the cabinet, and connect the ground wire and the airborne RF device under test.

[0066] Step S2: Initialize the airborne RF device under test and the integrated simulation test system; set each button switch of the airborne RF device under test to the initial state, and set the control panel of the power supply and control unit of the integrated simulation test system to the off state.

[0067] Step S3: Start the integrated simulation test system for testing; start the integrated simulation test system for airborne radio frequency equipment, use the integrated simulation test system for airborne radio frequency equipment to control and manage the host computer software, input test parameters according to the test items, execute the test and feedback the test data.

[0068] Step S4: generate a test report based on the calibration test data; compare the calibration test data with the index value. If all test results are qualified, the airborne RF device under test is qualified, otherwise the airborne RF device is unqualified; determine the qualification of the airborne RF device product, generate and store the test report.

[0069] The embodiment of the present invention is analyzed through two specific practical cases. The first case is to test the Traffic Collision Avoidance System (TCAS). The working function test requirements of the Traffic Collision Avoidance System (TCAS) include: A mode; C mode; S roll call mode. The test steps are:

[0070] Step S21: Figure 4 Connect the test device as shown, turn on the test device, enter the Settings-Test Mode Selection interface, change the mode to Normal Mode, and keep the rest unchanged.

[0071] Step S22: Enter the TCAS performance test interface, set the aircraft address to 50000000, select the mode to "TCAS reply test", set the output power to 0dBm, select "A mode reply custom", start the test, and click "OK" in the pop-up box.

[0072] Step S23: Record the display identification code result and record it in Table 1.

[0073] Step S24: Click “Skip” in the pop-up window, repeat the operation in step S23, and record the measured “C-mode answer customization” and “S-mode roll-call answer customization” in the table below.

[0074] Table 1 Pulse interval test results

[0075] Serial number model On-machine setting value Test Results in conclusion 1 A 2345 2345 qualified 2 C 4023.36 4023.36 qualified 3 S Roll Call 3954.78 3954.78 qualified

[0076] Test the working mode of the air collision avoidance system (TCAS). The working mode of the TCAS response test is determined by measuring the interval between P1 and P3 pulses and the presence or absence of P4 pulses. The signal of the S roll call response test is composed of P1, P2, and P6 pulses, of which the effective part of the signal is a long pulse signal of 19.25μs or 33.25μs. Pulse interval: the time when the maximum amplitude of the first pulse is 50% and the maximum amplitude of the third pulse is 50%. A mode pulse interval: 8±0.2; C mode pulse interval: 21±0.2. The test steps are:

[0077] Step S31: Figure 5 Connect the test equipment as shown, turn on the test equipment, enter the Settings-Test Mode Selection interface, set TCAS to Normal, and keep the rest unchanged.

[0078] Step S32: Enter the TCAS performance test interface, select the mode as "TCAS response test", set the output power to -10dBm, select "A mode response customization", start the test, and click "OK" in the pop-up box.

[0079] Step S33: Set the oscilloscope to 1 channel trigger, set the oscilloscope time scale to 10μs / grid, capture the pulse waveform, click the oscilloscope Cursors button, move the x1 cursor to the rising edge of the first pulse, move the x2 cursor to the rising edge of the second pulse, read the value of Δx, which is the interval between P1 and P3 pulses, and record the test data in mode A in Table 2.

[0080] Table 2 Pulse interval test results

[0081] Serial number model Test index (μs) Test results (μs) in conclusion 1 A 8±0.2 8.01 qualified 2 C 21±0.2 21.01 qualified 3 S Roll Call 2±0.2 2.01 qualified

[0082] Step S34: Click “Skip” in the pop-up window, repeat the operation in step (3), and record the measured Δt of “C-mode customized response” and “S-mode customized roll call response” in the test results of Table 2.

[0083] Test the transmission frequency accuracy of the air collision avoidance system (TCAS). Test description: reply test, transmission frequency: 1030MHz, accuracy ±0.01MHz. Inquiry test, transmission frequency: 1090MHz, accuracy ±0.01MHz. Test steps:

[0084] Step S41: Figure 6 Connect the test equipment as shown, turn on the test equipment and enter the Settings-Test Mode Selection Interface, set TCAS to test mode, and keep the rest unchanged.

[0085] Step S42: The detection device enters the TCAS performance test interface, selects the mode as "TCAS response test", sets the output power to -20dBm, selects the test item "power measurement", and starts the test.

[0086] Step S43: The spectrum analyzer center frequency is set to 1030 MHz, the span is 1 MHz, and the RBW is 1 KHz. The measured peak frequency is recorded in the corresponding space in Table 3.

[0087] Step S44: Select the mode as “TCAS inquiry test”, select the test item “power measurement”, and start the test.

[0088] Step S45: The spectrum analyzer center frequency is set to 1090 MHz, the span is 1 MHz, and the RBW is 1 KHz. The measured peak frequency is recorded in the corresponding space of the test result in Table 3.

[0089] Table 3 Transmission frequency test results

[0090] Serial number model Nominal frequency (MHz) Measured frequency (MHz) in conclusion 1 Response test 1030±0.01 1030.000 qualified 2 Ask for test 1090±0.01 1090.000 qualified

[0091] The second specific application case of the present invention is to conduct application analysis on the altitude function test of the radio altimeter, which requires the altitude simulation function. The test steps are:

[0092] Step S51: Figure 7 Connect the test equipment as shown and turn on the test equipment; enter the Settings-Test Mode Selection interface, change the mode to Normal Mode, and keep the rest unchanged.

[0093] Step S52: The testing device enters the altimeter performance test interface, selects "customized height measurement accuracy", and starts the test.

[0094] Step S53: Input the altitude value according to the table below and record the displayed altitude on the aircraft in Table 4.

[0095] Table 4 Height accuracy results

[0096] Serial number Setting height(m) Altitude displayed on board (m) in conclusion 1 2000 2000.0 qualified 2 10000 10000.0 qualified

[0097] Test the working frequency range and accuracy of the radio altimeter; test description, working frequency 4200 ~ 4400MHz, accuracy ±10KHz, the selected chip frequency range is 54MHz ~ 6800MHz; test steps are:

[0098] Step S61: Press Figure 8 Connect the test equipment as shown, turn on the test equipment, enter the Settings-Test Mode Selection interface, set the altimeter test mode to Measurement, and keep the rest unchanged.

[0099] Step S62: setting the microwave signal source to output a continuous wave signal with a frequency of 4200 MHz and a power of 10 dBm;

[0100] Step S63: Set the spectrum analyzer center frequency to 4200 MHz, span to 1 MHz, RBW to 1 KHz, and reference level to 10 dBm.

[0101] Step S64: The detection device enters the altimeter performance test interface, selects "altitude measurement accuracy 3m", and starts the test.

[0102] Step S65: The spectrum analyzer reads the peak frequency of the signal and records the test data in Table 5.

[0103] Step S66: according to Table 5, repeat steps S62, S63, S64, and S65, set the microwave signal source frequency, change the center frequency of the spectrum analyzer accordingly, read the peak frequency of the spectrum analyzer, and record the test data in Table 5;

[0104] Step S67: If the measured value is within the range shown in Table 5, the working channel range and transmission frequency accuracy indicators are qualified.

[0105] Table 5 Operating frequency range and accuracy results

[0106] Serial number Set frequency (MHz) Nominal frequency (MHz) Measured frequency (MHz) in conclusion 1 4200 4200±0.01 4200.0 qualified 2 4400 4400±0.01 4400.0 qualified

[0107] Test the altitude simulation range and accuracy of the radio altimeter; the test description is: altitude simulation range: 0m~10000m, up to 15000m. Accuracy ±(1m+1.5%H); the test steps are:

[0108] Step S71: Press Fig. 9 Connect the detection device as shown, turn on the detection device, enter the setting interface of the detection device, click test mode, change the altimeter test mode to measurement, and keep the rest unchanged.

[0109] Step S72: Set the microwave signal source to output a pulse modulation signal with a frequency of 4300 MHz, a power of 10 dBm, a modulation pulse width of 2 us, and a repetition frequency of 5 KHz.

[0110] Step S73: The detection device enters the altimeter performance test interface, selects "custom altitude", enters 0m, and starts the test; uses an oscilloscope to measure the delay of the rising edge of the channel 2 pulse relative to the rising edge of the channel 1 pulse. The measured value corresponds to the minimum delay inside the detection device and the delay caused by the cable and video pulse synchronization, which is recorded as the delay offset Dmin.

[0111] Step S74: Set the simulation height value in sequence according to Table 6. The oscilloscope reads the delay value and records the test data in Table 6. The correction value is obtained by subtracting the delay offset Dmin tested in step S73, which is recorded in Table 6. Turn off the output of the signal source.

[0112] Table 6 Height simulation test results

[0113]

[0114]

[0115] The embodiment of the present invention analyzes two specific application cases of the above-mentioned Traffic Collision Avoidance System (TCAS) test and the radio altimeter test, and it can be seen that the current test system can not only measure the physical quantity indicators of the radio frequency equipment but also form a functional isolation.

[0116] The beneficial effects of the present invention are as follows: the present invention provides a comprehensive simulation test system for airborne radio frequency equipment. The embodiments of the present invention are designed with an open integrated architecture. The system realizes the standardization and generalization of hardware resources without reducing the functional performance of each sensor, that is, it is oriented to the test items of airborne radio frequency equipment, rather than specific equipment, so as to achieve the sharing of hardware resources. A wide-band integrated design scheme is adopted for the system radio frequency design, which can cover the frequency band requirements of all test items; the functional modules in the system should be standardized in design, with fast data throughput, good modular structure, strong openness, and reserve expansion margin from both hardware and software aspects, so as to facilitate expansion and upgrading. The present invention can greatly improve the integration level of the test system for airborne radio frequency equipment, enhance the versatility of the test system, and realize the integration of multiple functions.

[0117] The embodiments described above are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A comprehensive simulation test system for airborne radio frequency equipment, characterized in that: It includes: Human-machine interaction unit, integrated RF rack unit, power supply and control unit, and supporting test cables for the cabinet; The human-computer interaction unit realizes the control interface display of the comprehensive simulation test system, real-time reception of feedback status data, comprehensive simulation test system operation and voice data testing; The integrated RF rack unit is composed of an intermediate frequency exchange matrix module and a broadband RF front-end processing module; the integrated RF rack unit can realize broadband RF signal processing, waveform modulation and demodulation, audio analysis and processing, and data storage and recording of each airborne RF device; The intermediate frequency exchange matrix module is composed of a control submodule, an intermediate frequency processing submodule, a high-speed serial bus matrix exchange submodule, and a low voltage differential signal and discrete signal matrix exchange submodule; the intermediate frequency exchange matrix module can realize the routing exchange, filtering, amplification, gain detection and automatic gain control of intermediate frequency signals and digital signals between the universal receiving module, the universal excitation module, and the universal signal processing module; The broadband RF front-end processing module is used to realize the channel switching function, realize the switching, amplitude adjustment, power detection, filtering and amplification functions of the external RF signal and the RF signal transmission in the integrated RF unit; the channel switching function is specifically realized by the RF function selection switch matrix, the U / V / L band transceiver channel, the C band transceiver channel, the multi-signal transceiver channel and the satellite communication transceiver channel combination; the channel switching function selects the U / V / L band transceiver channel, the C band transceiver channel, the multi-signal transceiver channel and the satellite communication transceiver channel through the RF function selection switch matrix; the RF function selection switch matrix includes 4 signal inputs and 4 signal outputs, forming a 1:1 signal switching path; each of the 4 signal input ports and the 4 signal output ports contains a single-pole double-throw switch, the first branch of each single-pole double-throw switch is connected to realize the signal output port of the signal, and the second branch is switched to an 8-to-1 switch to realize spectrum power detection, and output the spectrum power detection signal data; The power supply and control unit are used for output control of AC power supply, and power supply and output control of DC multi-channel adjustable power supply, which respectively power the human-machine interaction unit and the integrated radio frequency rack unit. The DC output is divided into four independent high-power adjustable power supplies, which respectively power the integrated radio frequency rack unit, and three external DC output power supplies; The cabinet supporting test cable is used to realize the interconnection of electrical and communication interfaces among the human-machine interaction unit, the integrated radio frequency rack unit, and the control unit.

2. A comprehensive simulation test system for airborne radio frequency equipment according to claim 1, characterized in that: The human-computer interaction unit is installed with control management host computer software, data recording and analysis software, and data management software; it is used to realize the control interface display of the comprehensive simulation test system, real-time reception of feedback status data, operation of the comprehensive simulation test system, and data testing functions.

3. A comprehensive simulation test system for airborne radio frequency equipment according to claim 1, characterized in that: The integrated radio frequency rack unit also includes: a system control management module, a general signal processing module, a general receiving module, a general excitation module, a general broadband processing module, a local oscillator frequency source module, a power conversion module, a data storage recording module and a satellite communication center station; The system control and management module is used to implement the control and management functions of the multi-function, multi-mode digital radio; The universal signal processing module is used to realize baseband digital signal processing including AD conversion, down-conversion, filtering, modulation, demodulation, spread spectrum, despreading, encoding, decoding, beam envelope processing and azimuth measurement of radio frequency signals, and can also complete frequency control and transceiver switching functions for related radio frequency channels; The universal receiving module is used to realize frequency conversion processing of 8-channel radio frequency signals to analog intermediate frequency signals; The universal excitation module is used to realize the change processing of the baseband I / Q signal in the 4-way working frequency band to the specified excitation signal; The general broadband processing module is used to implement general communication, index testing of navigation functions and signal simulation of navigation functions; The local oscillator frequency source module is used to provide multiple local oscillator signals required for frequency conversion; The power conversion module is used to convert the DC power input by the power supply and control unit into the DC voltage required by the functional modules in the integrated radio frequency rack unit; the data storage and recording module is used to realize the storage and recording of the data of each bus interface; The satellite communication center station is used to realize the intercommunication of satellite communication functions and support voice, synchronous data, asynchronous data and short message communication capabilities.

4. A comprehensive simulation test system for airborne radio frequency equipment according to claim 1, characterized in that: The power supply and control unit includes a power supply and a control board, specifically: The power supply is used to supply AC power to the computer in the human-machine interaction unit and the satellite communication center station in the integrated radio frequency rack unit. The DC output is divided into four independent high-power adjustable power supplies, which respectively supply power to the integrated radio frequency rack unit, and three external DC outputs; The control panel is used to control the input of DC and AC voltages, the output of AC and DC voltages of each branch, and display the total power supply, the working status of each branch power supply, and the output terminal voltage and current value.

5. A comprehensive simulation test system for airborne radio frequency equipment according to claim 4, characterized in that: The RF modules in the integrated RF rack unit select wide-band and large-dynamic devices and perform segmented processing according to different functional characteristics to broaden the frequency band of general RF. The general signal processing module and the system control and management module select a large-scale hardware platform to achieve software embedding of multiple functions, signal modulation and demodulation, and system resource configuration management.

6. A comprehensive simulation test system for airborne radio frequency equipment according to claim 5, characterized in that: The integrated radio frequency rack unit adopts a software radio architecture, and can freely switch the signal processing of functional waveforms on the hardware platform of the integrated simulation test system; and according to the test requirements, the function expansion and upgrade can be achieved by loading software.

7. A comprehensive simulation test system for airborne radio frequency equipment according to claim 1, characterized in that: When the comprehensive simulation test system needs to run a certain function, the hardware resources related to this function are combined with the support of the RF switch matrix and the high-speed data bus network to form a complete hardware channel link resource that completes the function from RF channel, digital signal processing to data processing. At the same time, by loading and running the relevant test function software, a logical function is formed to complete the processing of all RF signals and digital signals of the function item; The comprehensive simulation test system supports dynamic reconstruction and can be reconstructed according to tasks or external input commands; the reconstruction process is achieved under the control of the system control management module through dynamic loading of software and switching of radio frequency switches and logic switches.

8. A testing method for a comprehensive simulation test system for airborne radio frequency equipment according to any one of claims 1 to 7, characterized in that: It includes the following steps: S1: Build a comprehensive simulation test system; connect the external power supply, set the grounding terminal at the bottom of the cabinet, and connect the ground wire and the airborne RF device under test; S2: Initialize the airborne RF device under test and the integrated simulation test system; put the button switches of the airborne RF device under test in the initial state, and put the control panel of the power supply and control unit of the integrated simulation test system in the off state; S3: Start the comprehensive simulation test system for testing; start the comprehensive simulation test system for airborne radio frequency equipment, use the comprehensive simulation test system for airborne radio frequency equipment to control and manage the host computer software, input test parameters according to the test items, execute the test and feedback the test data; S4: calibrate the test data to generate a test report; Compare the calibration test data with the index value. If all test results are qualified, the airborne RF equipment under test is qualified, otherwise the airborne RF equipment is unqualified; determine the qualification of the airborne RF equipment product, generate and store the test report.

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