CN113259021A - Automatic receiving and dispatching testing device for portable aviation radio station - Google Patents
Automatic receiving and dispatching testing device for portable aviation radio station Download PDFInfo
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- CN113259021A CN113259021A CN202110480654.9A CN202110480654A CN113259021A CN 113259021 A CN113259021 A CN 113259021A CN 202110480654 A CN202110480654 A CN 202110480654A CN 113259021 A CN113259021 A CN 113259021A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The automatic receiving and sending test device for the portable aviation radio station provided by the invention has the advantages of stable test performance, good universality and high reliability. The invention is realized by the following technical scheme: the audio interface mainboard integrates related components of each receiving and transmitting channel together, and intensively manages the excitation of the whole system and the input and output of test signals; in a receiving state, the local oscillator of the frequency source module generates various frequencies required by receiving/transmitting and provides the frequencies to the receiving module and the frequency source module, the receiving module demodulates and amplifies received high-frequency signals under the coordination of the whole machine, receives control data and transmits state data, and the frequency source module provides excitation required by a tested object to complete receiving test and then outputs the excitation to an earphone; in the transmitting state, the audio signal is amplified, subjected to noise reduction treatment and impedance conversion and then sent to the frequency source module and the earphone to complete the combined modulation of the transmitting frequency, and the test of the test data of various airplane radio station items is tested and diagnosed through the control and test unit.
Description
Technical Field
The invention relates to a portable receiving and transmitting outfield detection device suitable for testing, wireless wave correction and wired joint test of an airborne ultrashort wave anti-interference aeronautical radio station.
Background
The aviation radio service is the basis for guaranteeing the aviation order, and the carrier of the aviation radio service is radio waves. The information exchange between the aircraft and the outside world during air flight is almost completely dependent on the aviation radio service, so the aviation radio service plays a crucial role in guaranteeing the safety of air traffic. However, with the recent gradual expansion of the commercial scale of civil aviation, the dependence of civil aviation on radio services has also gradually increased. Meanwhile, due to the massive application and popularization of various electronic and electrical devices, the electromagnetic environment in which the aviation radio business is located is increasingly severe, and the problem of electromagnetic compatibility is increasingly prominent. With the rapid increase of the number of aircrafts, the pressure of field protection is increased due to the mass delivery of aviation communication stations, and the number of repair is increased rapidly. There is a higher demand for fault location and fault removal of equipment. Particularly, when a large amount of fault detection and external field qualitative (wireless and wired) test equipment is not available in the conventional repair equipment, no better means is provided for fault location of the aviation radio station product. The aircraft VHF radio station is an important device for the communication between the unit and the ground. The automation is the development direction of avionic maintenance test equipment, maintenance personnel and detection equipment can be reduced, and the maneuverability can be improved; the maintenance time can be shortened, the maintenance efficiency is improved, and the rapid maintenance guarantee capability is favorably improved. However, the conventional instruments are mainly used as the avionic maintenance detection equipment at present, and a test system formed by the conventional instruments has the defects of multiple instrument varieties, large volume and heavy weight; the test is carried out manually, so that the time and labor are wasted, the test error is large, and the requirement of battle training on the quick mobility of the maintenance guarantee is difficult to meet. As aircraft age increases, the number of station antenna loops that fail increases significantly. Because the very high frequency radio transceiver of most present aircraft does not have the antenna self-checking function, when the maintenance of the crew is examined in the field, it is very difficult to judge whether the antenna is out of order or the transceiver is out of order rapidly, which wastes time and labor, and reduces the safety performance and daily utilization rate of the aircraft. The tested object relates to various radio station devices of various advanced aircrafts in active service, including western type, Russian type and domestic type, and also has the characteristics of short wave and ultra-short wave, the working frequency, the working mode and the interface control characteristics of various radio stations are different, the radio stations are various in types, different in technical content, inconsistent in technical specification indexes and interface characteristics, and different in technical specification requirements. If a traditional instrument is adopted for testing, the testing is completed by multiple testing devices and instruments together, so that the testing devices are poor in universality, low in automation degree and complex in operation, users are prone to misjudge faulty products, the fault-free products are returned to equipment manufacturers for maintenance, the product repair speed is seriously affected, the number of faults of aviation equipment is increased, the number of 'fault-free' inspection of aviation radio stations is increased, the after-sale cost is increased, and the aircraft attendance rate is affected.
The prior avionic maintenance detection equipment mainly adopts a traditional instrument, and a test system formed by the traditional instrument has the defects of multiple instrument varieties, large volume and heavy weight; the test is carried out manually, so that the time and labor are consumed, the test error is large, and the requirement on quick mobility of maintenance guarantee is difficult to meet. The aviation radio station is produced and repaired in an equipment factory without a set of complete wired and wireless voice communication equipment, an effective means is lacked during radio station joint test, particularly, a fixed and reliable signal source does not exist in an anti-interference spread spectrum modulation mode, and only one set of aviation radio station matched with a production workstation can be set up as an anti-interference signal source during testing anti-interference sensitivity and receiving dynamics. Hardware of an automatic test system of an airborne radio station in the prior art generally comprises a computer, a program-controlled general instrument, a program-controlled special instrument, an interface connection adapter (ICA/ITA) and a tested station. The computer controls different instruments through the bus to complete the test of the tested equipment, and simultaneously analyzes and processes the collected signals and displays the test result. And the program-controlled universal instruments comprise a test instrument system, a radio station simulator, a power meter, a comprehensive tester, an error code instrument, a power supply and the like, wherein the ICA is directly connected with the instruments, and resources such as instruments and switches which can be used by the system are uniformly planned and distributed to the VXI bus. If the computer and the tested object are directly coupled, the computer will interfere the tested object, which will cause the error control of the system to the tested object, if not, the test error will be caused, if not, the radio station will be transmitted by mistake, thus threatening the safety of the test instrument and the transceiver itself. In view of the above problems, a testing device is needed to solve the problem of the combined test and monitoring of the outfield, and meanwhile, the testing device can be used as a two-line testing platform for production and debugging, so that the repair speed and the repair quality of after-sale products are improved as a whole. In order to meet the requirements of the availability and the attendance rate of large-scale airplanes, the failure rate of aviation communication products must be reduced, and the external field failure positioning and repairing rate must be improved.
Disclosure of Invention
The invention aims to improve the test performance and the universality of an airborne ultrashort wave anti-interference aircraft radio station test system and the guarantee efficiency of an aircraft radio station in an external field, and aims at providing a portable aircraft radio station transceiver of the existing airborne ultrashort wave anti-interference aircraft radio station without wireless wave correction equipment in the external field and without voice joint test equipment in an internal field. The Automatic Test Equipment (ATE) for the external field detection of the aviation radio station has stable test performance, good universality and high reliability, and can improve the automation degree and the maintenance quality.
The above object of the present invention can be achieved by the following measures, a portable automatic transceiving test device for an aviation radio station, comprising a power supply module for supplying power, an audio processing module for connecting an audio interface motherboard, a receiving module, a frequency source module for generating oscillation frequency and exciting radio frequency source output, a general control and test unit and a display control module, wherein the general control and test unit comprises: the audio interface mainboard is cross-linked with other communication equipment through wired fixed attenuation or adopts wireless real voice to cross-link with other communication equipment, integrates related components of each receiving and transmitting channel, intensively manages the input and output of excitation and test signals of the whole system, controls the working state and the working mode of the plug-in equipment through a PC (personal computer) and an interface board, generates various frequencies required by receiving/transmitting and provides the frequencies to a frequency source module and a receiving module; in a receiving state, the local oscillator of the frequency source module generates various frequencies required by receiving/transmitting and provides the frequencies to the receiving module and the frequency source module, the receiving module demodulates and amplifies a received high-frequency signal under the coordination of the whole machine, receives control data and transmits state data to complete the whole processes of frequency selection, frequency mixing, demodulation and low-frequency amplification of conventional communication receiving, the display control module controls the working state of a tested object, and the frequency source module provides the excitation required by the tested object to complete the receiving test and then outputs the excitation to an earphone; in the transmitting state, the audio signal is transmitted to the frequency source module and the earphone after being subjected to audio amplification, noise reduction, impedance conversion and other transformations through the audio processing board, the low-frequency modulation is adopted to modulate and primarily amplify the low-frequency signal, the whole process of combined modulation of the transmitting frequency is completed, the modulated radio frequency signal is output, and the universal control and test unit performs tests on various test data of the airplane radio station project through the switch matrix and program control.
Compared with the prior art, the invention has the following beneficial effects:
small volume and high integration. The invention adopts a power supply module for providing power supply, an audio processing module connected with an audio interface mainboard, a receiving module, a frequency source module, a general control and test unit and a display control module to form the portable automatic receiving and transmitting test device of the aviation radio station according to the test requirement of the aviation radio station, and the portable automatic receiving and transmitting test device of the aviation radio station is based on the audio interface mainboard and takes the frequency source module, the receiving module and a local oscillator module interface card/adapter as a bridge, thereby integrating control, acquisition, processing, storage, analysis and display into a whole, having small volume, light weight and convenient maintenance and carrying, greatly shortening the test and maintenance time, reducing the cost and being beneficial to improving the maneuvering capability and the rapid maintenance and guarantee capability. By adopting one-stage frequency conversion and configuring a proper peripheral auxiliary circuit, the requirement of the functional performance of the equipment is met, the integration level of a channel is further improved, and the purpose of miniaturization of the equipment is achieved. The design adopts the touch screen operation to modify the parameters of the equipment, the practicability is strong, and the operation interface is simple and convenient.
The invention adopts an audio interface mainboard to be cross-linked with other communication equipment through wired fixed attenuation and program control attenuation or adopts wireless real voice to be cross-linked with other communication equipment, integrates related components of each receiving and transmitting channel, adopts low-frequency modulation output to intensively manage the input and output of excitation and test signals of the whole system, controls the working state and the working mode of plug-in equipment through a PC (personal computer) and an interface board, generates various frequencies required by receiving/transmitting and provides the frequencies to a frequency source module and a receiving module; the high-power amplifier module is saved, and the size and the power consumption of equipment are greatly reduced. The system has the function of completing voice communication of the outfield aeronautical radio station; the communication quality of the airplane and the ground command console can be monitored; the sensitivity of the voice radio station can be tested; the device has the function of automatically storing wireless and wired calls after being electrified, records in a database form completely, is convenient to monitor, trace and utilize, and can play back the records at any time.
When the invention is in a receiving state, the local oscillator generates various frequencies required by receiving/transmitting and provides the frequencies to the receiving module and the frequency source module, the receiving module demodulates and amplifies received high-frequency signals under the coordination of the whole machine, receives control data and transmits state data to complete the whole processes of frequency selection, frequency mixing, demodulation and low frequency amplification of conventional communication receiving, the display control module controls the working state of a tested object, provides the excitation required by the tested object, completes the test of a receiving exciter and then outputs the test to an earphone, and the test can be used for wave correction of ground service before outfield flight. The portable aeronautical radio transceiver completely meeting the test requirements of users has the advantages that the frequency source module generates various frequencies required by receiving/transmitting and provides the frequencies to the receiving and exciting module, and the receiving module completes the whole processes of frequency selection, frequency mixing, demodulation and low-level amplification of conventional communication receiving under the coordination of the whole machine during receiving; when transmitting, the excitation module completes the whole process of transmitting frequency combination modulation and provides 10dBm (AM \ FM) modulated radio frequency signal output. The audio signal is subjected to audio amplification, noise reduction, impedance conversion and other transformations through the audio processing board and then is sent to the excitation module and the earphone; the system can communicate with a hangar or a tower in various modulation modes only by connecting 220V alternating current, and can also carry out voice sensitivity test. The program-controlled variable attenuation is designed to change the signal output amplitude, and the efficiency of testing the receiving and transmitting AGC indexes and the receiving sensitivity is high.
In the transmitting state, the audio signal is transmitted to the frequency source module and the earphone after being subjected to audio amplification, noise reduction, impedance conversion and the like through the audio processing board, the low-frequency modulation is adopted to modulate and primarily amplify the low-frequency signal, the whole process of combined modulation of the transmitting frequency is completed, the modulated radio frequency signal is provided to output an audio level, and the universal control and test unit diagnoses the test data of various airplane radio station items through all tests specified by a switch matrix and program control. Cross-linking with other communication equipment through wired fixed attenuation and programmed attenuation, or cross-linking with other communication equipment by adopting wireless real voice. The working state and the working mode of the plug-in equipment are controlled by the PC and the interface board, all test items of the radio station can be automatically completed, maintenance personnel and detection equipment can be reduced, the maintenance time can be shortened, and the maintenance efficiency can be improved.
The power supply module converts 220V alternating current voltage into +28V/2A, +15V/1A, +5V/1A direct current voltage for the frequency synthesis module, the excitation source module, the receiving module and the display control module to use.
Aiming at the multiple models of the current aviation communication equipment, the invention adopts a device which has the function of completing the voice communication of an external field aviation radio station, can monitor the communication quality of an airplane and a ground command console and can test the sensitivity of the voice radio station aiming at lightening the operation and management cost of each production debugging and ensuring the manpower and material resources of a flying following person and improving the operation efficiency of the first-line detection equipment of the aviation radio station, and the first-line detection equipment of the aviation radio station needs to automatically store wireless and wired communication after the equipment is powered on, complete record is recorded in a database form, convenient monitoring, tracing and utilization and can play back the record at any time; the system is compatible with an XX4 series radio station two-line detection source (anti-interference and plug-in control function) to control an XX5 series radio station and an XX6 series radio station (anti-interference and plug-in control function) 3 series aviation radio stations and the effect of the two-line detection source; can realize AM, FM, (DS, DS/FH, FH) wireless conversation function, can be in the production of aviation radio station, reprocess and accomplish wired and wireless voice communication function, there is a fixed reliable signal source when the anti-interference spread spectrum modulation mode of radio station antithetical couplet examination, need not set up the supporting aviation radio station of one set of production workstation again when testing anti-interference sensitivity and receiving developments as anti-interference signal source, can solve the antithetical couplet examination and the monitoring of outfield, can regard as the second line test platform of production and debugging simultaneously, improve the speed of reprocessing of after-sale product on the whole, reprocess the quality.
The invention completes the design and debugging of the system, and realizes the test of the main performance index of the radio station and the interface signal on the radio station; the application result shows that the detector device has small volume, high cost performance, convenient use, good maintainability, high reliability and convenient expansion, is suitable for the voice fault location of various types of aviation communication radio stations, the debugging production of the aviation radio stations, the communication distance joint test and wave correction, monitors the communication quality of airplanes and ground command consoles and tests the sensitivity of the voice radio stations. The method is suitable for the functional application of the signal source of the radio frequency system of each platform.
The invention is suitable for airborne ultrashort wave anti-interference aviation radio stations.
Drawings
The invention is further described with reference to the following figures and embodiments.
Fig. 1 is a schematic circuit diagram of the automatic transceiving test device of the portable aeronautical radio station.
Fig. 2 is a functional block diagram of the frequency source module of fig. 1.
Fig. 3 is a functional block diagram of the receiver of fig. 1.
Fig. 4 is a schematic block diagram of a local oscillator circuit of the frequency source module of fig. 1.
FIG. 5 is a schematic diagram of the display and control of the present invention.
See fig. 1. In the preferred embodiment described below, a portable automatic transmit-receive testing device for an aircraft radio station comprises a power supply module for supplying power, a frequency source module connected with an audio interface mainboard for providing local oscillator excitation, a receiving module, an audio processing module, a general control and test unit and a display control module. The frequency source module is cross-linked with other communication equipment through wired fixed attenuation and program control attenuation, or cross-linked with other communication equipment by adopting wireless real voice, and relevant components of each channel of transceiving channel are integrated together, so that the excitation of the whole system and the input and output of test signals are managed in a centralized manner. The working state and the working mode of the plug-in equipment are controlled by the PC and the interface board, various frequencies required by receiving/transmitting are generated and provided for the frequency source module and the receiving module; in a receiving state, the local oscillator of the frequency source module generates various frequencies required by receiving/transmitting and provides the frequencies to the receiving module and the frequency source module, the receiving module demodulates and amplifies a received high-frequency signal under the coordination of the whole machine, receives control data and transmits state data to complete the whole processes of frequency selection, frequency mixing, demodulation and low-frequency amplification of conventional communication receiving, the display control module controls the working state of a tested object, the frequency source module provides the excitation required by the tested object to complete the test of a receiving exciter, and then the excitation is output to an earphone; in the transmitting state, the audio signal is transmitted to the frequency source module and the earphone after being subjected to audio amplification, noise reduction, impedance conversion and other transformations through the audio processing board, the low-frequency modulation is adopted to modulate and primarily amplify the low-frequency signal, the whole process of combined modulation of the transmitting frequency is completed, the modulated radio frequency signal is provided to output the radio frequency modulated signal, and the universal control and test unit diagnoses the test data of various airplane radio station items through all tests specified by a switch matrix and program control.
The power supply module converts 220V alternating-current voltage with voltage ripples less than or equal to 80mV of each group into direct-current voltage of +28V +/-0.5V/0.5A, +12V +/-1V/2A, + 12V/0.3A, +5V +/-0.5V/1A for the frequency source module, the receiving module, the display control module and the like.
See fig. 2. The frequency source module includes: the receiving and transmitting switch, the low local oscillation unit, the high local oscillation unit, the excitation unit and the program-controlled attenuator are connected with the receiver module. A series of data sent by the display control module generates 895MHz frequency of which the local oscillation frequency is lower than the signal frequency by one intermediate frequency through the low local oscillation unit, when the local oscillation frequency of the high local oscillation unit is higher than the signal frequency, the high local oscillation generates adjustable high-frequency with the frequency range of 1003 MHz-1295 MHz, the low local oscillation unit and the high local oscillation unit perform a series of processing such as frequency mixing, filtering, modulation and amplification on the high and low local oscillations through the excitation unit, generate 108 MHz-400 MHz radio frequency signals and output the radio frequency signals to the program-controlled attenuator, so that the change of signal amplitude-110 dBm +/-1 dB-10 dBm +/-1 dB is completed, and finally the signals are output to the antenna through the receiving and transmitting switch.
See fig. 3. The receiver includes: the high-frequency selection amplifying unit is connected with the frequency conversion unit of the low local oscillator unit and the high local oscillator unit, the intermediate frequency filter, the intermediate frequency amplifier, the AM/FM demodulator and the audio power amplifier circuit which are sequentially connected in series, an AGC circuit which is connected with the high-frequency selection amplifying unit and the intermediate frequency amplifier in parallel, and a squelch circuit which is connected with the AM/FM demodulator and the audio power amplifier circuit in parallel; the signal received by the high-frequency selection and evaluation amplifying unit from the antenna enters the frequency conversion unit through the receiving and sending switch, is subjected to first frequency mixing with a local oscillator signal sent by the low local oscillator unit to generate an intermediate-frequency signal, the intermediate-frequency signal is filtered by the intermediate-frequency filter and amplified by the intermediate-frequency amplifier, and then is subjected to second frequency mixing with a second local oscillator signal sent by the high local oscillator unit to obtain a second intermediate-frequency signal, and then the second intermediate-frequency signal is filtered by the intermediate-frequency filter and amplified by the intermediate-frequency amplifier, and part of the intermediate-frequency signal is fed back to the voltage-controlled gain control AGC circuit to perform AGC voltage demodulation and is fed back to the high-frequency selection and evaluation amplifying unit. The amplified intermediate frequency signal enters an AM/FM demodulator to be demodulated into an audio signal, the audio signal is subjected to squelch control of a squelch circuit and low-level amplification of an audio processing circuit to obtain an audio signal with rated power, and the audio signal is sent to a loudspeaker or an earphone to complete the whole conventional receiving process.
See fig. 4. The connection of the power module vibration excitation source module, the power supply module, the display control module and the general control and test unit on the mainboard of the audio interface mainboard circuit is spliced with each module through a low-frequency socket (RM422-086- The frequency signal of MHz is given to a phase discriminator PD, a part of signal is extracted by a voltage controlled oscillator VCO and fed back to a frequency dividing ratio circuit (÷ N), a comparison signal with the same frequency (1.63 MHz-10.82 MHz) and different phases is sent to the phase discriminator PD to control the phase discriminator PD to output a stable signal, after processing, the normal working state (AM/FM) is output to the voltage controlled oscillator VCO through a low pass filter LPF1 and an anti-interference working state through a low pass filter LPF2, one path of (1003 MHz-1295 MHz) high local oscillation signal is generated and is used as a local oscillation mixing signal when the radio frequency signal is modulated and demodulated, similarly, the other path of 100MHz signal is used as a reference signal and enters a phase locked loop PLL, and one path of (825MHz) low local oscillation signal is used as a mixing local oscillation signal when the radio frequency signal is modulated and demodulated through a band pass filter.
See fig. 5. The image display control module inputs corresponding frequency modulation modes and amplitudes through the display touch screen, outputs corresponding voltage control signals to each module through D/A digital-to-analog conversion, and the excitation source module outputs corresponding modulated signals according to the received voltage signals and outputs the required amplitudes through adjustable attenuation.
The frequency source module receives radio frequency signals, demodulates the radio frequency signals through the receiver and outputs audio signals which are respectively sent to the earphone interface and the audio recording end, the image display control module takes MHz as a unit and dBm as a unit, the frequency value and the amplitude of the modulation mode of the input equipment are digitally displayed on the touch display screen, and the display value is refreshed once when the value is changed once.
The present invention has been described in terms of specific embodiments, the foregoing examples being provided as illustrative of the invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. An automatic transceiving test device for a portable aviation radio station, comprising: the power module that provides the power connects audio frequency processing module, the receiving module of audio frequency interface mainboard, produces the frequency source module, general control and the test unit and the display control module of oscillation frequency and excitation radio frequency source output, its characterized in that: the audio interface mainboard is cross-linked with other communication equipment through wired fixed attenuation or adopts wireless real voice to cross-link with other communication equipment, integrates related components of each receiving and transmitting channel, intensively manages the input and output of excitation and test signals of the whole system, controls the working state and the working mode of the plug-in equipment through a PC (personal computer) and an interface board, generates various frequencies required by receiving/transmitting and provides the frequencies to a frequency source module and a receiving module; in a receiving state, the local oscillator of the frequency source module generates various frequencies required by receiving/transmitting and provides the frequencies to the receiving module and the frequency source module, the receiving module demodulates and amplifies a received high-frequency signal under the coordination of the whole machine, receives control data and transmits state data to complete the whole processes of frequency selection, frequency mixing, demodulation and low-frequency amplification of conventional communication receiving, the display control module controls the working state of a tested object, and the frequency source module provides the excitation required by the tested object to complete the receiving test and then outputs the excitation to an earphone; in the transmitting state, the audio signal is transmitted to the frequency source module and the earphone after being subjected to audio amplification, noise reduction, impedance conversion and other transformations through the audio processing board, the low-frequency modulation is adopted to modulate and primarily amplify the low-frequency signal, the whole process of combined modulation of the transmitting frequency is completed, the modulated radio frequency signal is output, and the universal control and test unit performs tests on various test data of the airplane radio station project through the switch matrix and program control.
2. The portable aviation radio station automatic transmission and reception testing apparatus according to claim 1, wherein: the frequency source module includes: and the receiving and transmitting switch, the low local oscillation unit, the high local oscillation unit, the excitation unit and the programmable attenuator are connected with the receiver module.
3. The portable aviation radio station automatic transmission and reception testing apparatus according to claim 2, wherein: a series of data sent by the display control module generates 895MHz frequency of which the local oscillation frequency is lower than the signal frequency by one intermediate frequency through the low local oscillation unit, when the local oscillation frequency of the high local oscillation unit is higher than the signal frequency, the high local oscillation generates adjustable high-frequency with the frequency range of 1003 MHz-1295 MHz, the low local oscillation unit and the high local oscillation unit perform a series of processing of frequency mixing, filtering and modulation amplification on the high and low local oscillations through the excitation unit, generate 108 MHz-400 MHz radio frequency signals and output the radio frequency signals to the program-controlled attenuator, change of signal amplitude-110 dBm +/-1 dB-10 dBm +/-1 dB is completed, and finally the radio frequency signals are output to the antenna through the receiving and transmitting switch.
4. The portable aviation radio station automatic transmission and reception testing apparatus according to claim 1, wherein: the receiver includes: the high-frequency selection amplifying unit is connected with the frequency conversion unit of the low local oscillator unit and the high local oscillator unit, the intermediate frequency filter, the intermediate frequency amplifier, the AM/FM demodulator and the audio power amplifier circuit which are sequentially connected in series, the AGC circuit which is connected with the high-frequency selection amplifying unit and the intermediate frequency amplifier in parallel, and the squelch circuit which is connected with the AM/FM demodulator and the audio power amplifier circuit in parallel.
5. The portable aviation radio station automatic transmission and reception testing apparatus according to claim 3, wherein: the signal received by the high-frequency selection and evaluation amplifying unit from the antenna enters the frequency conversion unit through the receiving and sending switch, is subjected to first frequency mixing with a local oscillator signal sent by the low local oscillator unit to generate an intermediate-frequency signal, the intermediate-frequency signal is filtered by the intermediate-frequency filter and amplified by the intermediate-frequency amplifier, and then is subjected to second frequency mixing with a second local oscillator signal sent by the high local oscillator unit to obtain a second intermediate-frequency signal, the second intermediate-frequency signal is filtered by the intermediate-frequency filter and amplified by the intermediate-frequency amplifier, part of the intermediate-frequency signal is fed back to the voltage-controlled gain control AGC circuit to perform AGC voltage demodulation and is fed back to the high-frequency selection and evaluation amplifying unit, the amplified intermediate-frequency signal enters the AM/FM demodulator to be demodulated into an audio signal, the audio signal is subjected to squelch control by the squelch circuit and low-amplification by the audio processing circuit to obtain an audio signal with rated power and then is sent to a loudspeaker or an earphone, and the whole receiving process is completed.
6. The portable aviation radio station automatic transmission and reception testing apparatus according to claim 1, wherein: the power module on the audio interface mainboard circuit mainboard shakes and stimulates power module, power supply module, display control module and general control and the connection of test unit all pegs graft with each module through low frequency socket (RM 422-086) 832 supplyes 9600) and high frequency socket.
7. The portable aviation radio station automatic transmission and reception testing apparatus according to claim 1, wherein: the audio interface mainboard circuit utilizes 100MHz reference frequency generated by the built-in frequency synthesis unit of the frequency source module as a reference clock, and after passing through a low-pass filter, then a monolithic amplifier is adopted for amplification, the reference frequency is divided into three parts, one path of 100MHz signal passes through a direct digital frequency synthesizer DDS to generate a signal in the range of 6.5MHz to 8.2MHz, a low-frequency signal is output by a low-pass filter LPF, the reference clock 100MHz signal and the reference clock are sent into a mixer for mixing to generate a reference signal with the frequency range of 106.5 MHz-108.2 MHz, the reference signal is output to a frequency division ratio circuit (div N) after being filtered by a sound meter filter, the frequency division ratio circuit (div N) is controlled by an external control I/O according to the working state to generate a frequency signal of 1.63 MHz-10.82 MHz to a phase discriminator PD, the comparison signal with the same frequency and different phases generated by extracting a part of signals from the voltage-controlled oscillator VCO and feeding the part of signals back to the frequency division ratio circuit (N) is sent to the phase discriminator PD to control the phase discriminator PD to output a stable signal.
8. The portable aviation radio station automatic transmission and reception testing apparatus according to claim 1, wherein: after the phase discriminator PD is processed, the AM/FM working state is filtered by a low pass filter LPF1, the anti-interference working state is output to a voltage controlled oscillator VCO by a low pass filter LPF2 to generate a high local oscillation signal, the high local oscillation signal is filtered and amplified to be used as a mixing local oscillation signal when the radio frequency signal is modulated and demodulated, similarly, the other path of 100MHz signal is used as a reference signal to enter a phase-locked loop PLL to generate a low local oscillation signal, and the low local oscillation signal is subjected to band-pass filtering to be used as the mixing local oscillation signal when the radio frequency signal is modulated and demodulated.
9. The portable aviation radio station automatic transmission and reception testing apparatus according to claim 1, wherein: the image display control module inputs corresponding frequency modulation modes and amplitudes through the display touch screen, outputs corresponding voltage control signals to each module through D/A digital-to-analog conversion, and the excitation source module outputs corresponding modulated signals according to the received voltage signals and outputs the required amplitudes through adjustable attenuation.
10. The portable aviation radio station automatic transmission and reception testing apparatus according to claim 1, wherein: the frequency source module receives radio frequency signals, demodulates the radio frequency signals through the receiver and outputs audio signals which are respectively sent to the earphone interface and the audio recording end, the image display control module takes MHz as a unit and dBm as a unit, the frequency value and the amplitude of the modulation mode of the input equipment are digitally displayed on the touch display screen, and the display value is refreshed once when the value is changed once.
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| CN114422043A (en) * | 2022-03-28 | 2022-04-29 | 成都嘉纳海威科技有限责任公司 | Reliability test device and method |
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