CN111953432B - High-power idle short wave radio station emission broadband noise testing device and method - Google Patents
High-power idle short wave radio station emission broadband noise testing device and method Download PDFInfo
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- CN111953432B CN111953432B CN202010805625.0A CN202010805625A CN111953432B CN 111953432 B CN111953432 B CN 111953432B CN 202010805625 A CN202010805625 A CN 202010805625A CN 111953432 B CN111953432 B CN 111953432B
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- 238000012360 testing method Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims abstract description 20
- 230000005236 sound signal Effects 0.000 claims abstract description 12
- 238000003780 insertion Methods 0.000 claims description 8
- 230000037431 insertion Effects 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
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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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention discloses a high-power no-load short-wave radio station transmitting broadband noise testing device and method. The test device comprises an audio signal generator, a digital power meter, a high-power absorption filter, a tuning band-pass filter, a PXA signal analyzer and a computer. The method of the invention utilizes the existing high-precision measuring instrument and combines a special high-power absorption filter, can test the emission broadband noise index of a high-power idle short-wave radio station at the frequency above 100MHz, and is used for comprehensively measuring the electromagnetic compatibility of the short-wave radio station, thereby improving the cooperative working capacity of the whole communication system on an airplane.
Description
Technical Field
The invention belongs to the field of short-wave communication equipment, and particularly relates to a short-wave radio station emission broadband noise test technology.
Background
As the high-power idle short-wave radio station is used as an important medium-distance and long-distance communication means of military special series aircrafts, the working frequency (2 MHz-30 MHz) of the high-power idle short-wave radio station in an aircrafts mission communication system is relatively low, and the transmitting power (up to 500W) is relatively maximum, the radio frequency radiation interference generated during transmitting can seriously influence the normal work of other electronic equipment on the aircrafts. The basis of the electromagnetic compatibility test of the military equipment and the subsystem is GJB 151B-2013 'requirements and measurement of electromagnetic emission and sensitivity of the military equipment and the subsystem', wherein the conduction emission project only prescribes the relative limit value of harmonic emission, spurious emission and fundamental wave level of an antenna port of an equipment transmitter and a test method, and the method is not suitable for testing the absolute value of spurious emission (parasitic, noise and the like) of the equipment transmitter, and can not fully reflect the electromagnetic compatibility performance of a high-power shortwave transmitter, and especially for no-load communication electronic equipment, whether the electromagnetic compatibility performance of the high-power shortwave transmitter can work together with other electronic equipment on an aircraft is very important. The emitted broadband noise is used as an important index for measuring the electromagnetic compatibility performance of the idle high-power short-wave radio station, no proper method for quantitatively testing and analyzing the absolute value of the emitted broadband noise exists at present, and the emitted electrical performance of the short-wave radio station cannot be comprehensively evaluated.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, the invention provides a device and a method for testing the broadband noise emitted by a high-power idle short-wave radio station, which can test the broadband noise emitted by the high-power idle short-wave radio station at a frequency above 100MHz, and solve the problem that the existing method without proper test is used for quantitatively testing and analyzing the broadband noise of a large signal.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a high-power no-load short wave radio station emission broadband noise testing device comprises an audio signal generator, a digital power meter, a high-power absorption filter, a tuning band-pass filter, a PXA signal analyzer and a computer; the signal output end of the audio signal generator is connected with the signal input end of the tested high-power idle short wave radio station, the signal input end of the digital power meter is connected with the signal output end of the tested high-power idle short wave radio station, the signal input end of the high-power absorption filter is connected with the signal output end of the digital power meter, the signal input end of the tuning band-pass filter is connected with the signal output end of the high-power absorption filter, the signal input end of the PXA signal analyzer is connected with the signal output end of the tuning band-pass filter, the signal input end of the computer is connected with the signal output end of the PXA signal analyzer, and the control ends of the tested high-power idle short wave radio station, the audio signal generator, the tuning band-pass filter and the PXA signal analyzer are respectively connected with the signal output end of the computer.
Further, the high-power absorption filter is used for separating the radio station working frequency from broadband noise, adopts a duplexer mode and comprises a high-power high-pass filter, a high-power low-pass filter and a high-power load, wherein signal input ends of the high-power high-pass filter and the high-power low-pass filter respectively receive input signals of the filters, signal output ends of the high-power high-pass filter output signals of the filters, and signal output ends of the high-power low-pass filter are connected with the high-power load.
Further, the tuning band-pass filter is a 5-order chebyshev filter with adjustable frequency and is used for filtering the higher harmonic content at the broadband frequency during radio station transmission.
Further, the computer performs data transmission with other devices through a USB interface, a network port or a serial port.
The test method based on the high-power idle short wave radio station transmitting broadband noise test device is characterized by comprising the following steps of:
(1) The computer controls the audio signal generator to send a single-tone modulation signal to the radio station to be tested;
(2) The computer controls the radio station to be tested to be an upper sideband or a lower sideband, and the power level and the working frequency of the radio station to be tested;
(3) Setting the initial frequency, the termination frequency, the reference amplitude, the resolution bandwidth and the video bandwidth of the PXA signal analyzer, opening a marking noise function, adjusting the bandwidth, and starting a preamplifier and noise floor expansion;
(4) The computer controls the tested radio station to enter a transmitting state, and observes whether the power value displayed on the digital power meter is a set rated output power value of the radio station; if yes, entering the next step; if not, checking the working state of the tested radio station;
(5) According to the broadband frequency to be measured, starting to adjust the center frequency of the tuning band-pass filter from the initial frequency, synchronously measuring and reading the noise value at the broadband frequency displayed on the PXA signal analyzer until the maximum band noise value in the range from the initial frequency to the termination frequency of the PXA signal analyzer is obtained;
(6) Calculating the emission broadband noise value of the tested radio station at the working frequency to be equal to the maximum broadband noise value obtained in the step (5), the insertion loss value of the high-power absorption filter and the insertion loss value of the tuning band-pass filter;
(7) The computer sets the working frequency interval of the radio station to be tested, tests the emission broadband noise value of the radio station to be tested in the whole working frequency range, and draws the amplitude-frequency curve graph corresponding to the radio station working frequency and the emission broadband noise value.
The beneficial effects brought by adopting the technical scheme are that:
the invention utilizes the existing high-precision measuring instrument and combines a special high-power absorption filter, can test the emission broadband noise index of a high-power idle short-wave radio station at a frequency above 100MHz, can evaluate the emission electric performance of the short-wave radio station more comprehensively, provides an important measuring means for the design and development of the radio station, ensures that the radio station transmitter has better electromagnetic compatibility and improves the cooperative working capacity of the whole communication system on an airplane.
Drawings
FIG. 1 is a schematic diagram of a testing apparatus according to the present invention;
fig. 2 is a schematic structural diagram of a high-power absorption filter according to the present invention.
Detailed Description
The technical scheme of the present invention will be described in detail below with reference to the accompanying drawings.
The invention designs a high-power no-load short-wave radio station emission broadband noise testing device, which is shown in figure 1 and comprises an audio signal generator, a high-power absorption filter, a tuning band-pass filter, a PXA signal analyzer and a computer.
The high-power idle short-wave radio station is a single-sideband short-wave radio station working in a frequency band of 2 MHz-30 MHz and comprises an audio input interface, a radio frequency output interface and an aviation bus control interface, and a transmitter can output radio frequency high-power signals up to 500W. The high-power absorption filter is used for realizing separation of radio station working frequency and broadband noise, and can inhibit radio frequency signals with equal amplitude report power of 500W below 30MHz frequency at most, and the insertion loss of frequency bands above 100MHz is not more than 0.5dB. The PXA signal analyzer is a high-performance real-time spectrum analyzer, which is internally provided with a local noise expansion technology and can accurately measure the average noise level close to the theoretical 'kTB' noise floor. The tuning band-pass filter is a 5-order Chebyshev filter with adjustable frequency and is used for filtering the higher harmonic content at the broadband frequency when a radio station transmits, the input power is more than 1W, the insertion loss is not more than 1dB, and the 3dB bandwidth is within 5%.
The high-power absorption filter designed by the invention comprises a high-power high-pass filter, a high-power low-pass filter and a high-power load, as shown in figure 2. The high-power absorption filter is formed by combining a duplexer into a filter with complementary admittance, the input end has higher standing wave ratio at any frequency point in a pass band and a stop band, signals with the frequency of more than 100MHz in the pass band can almost pass through the filter without loss, and signals with the frequency of less than 30MHz in the stop band are absorbed by a lossy absorption load in the filter.
The computer is respectively connected with the tested radio station, the PXA signal analyzer, the tuning band-pass filter and the audio signal generator through a USB interface, a network port or a serial port, and can set the working parameters (working mode, working frequency, power level and the like) of the tested radio station, the parameters (frequency and amplitude) of the audio generator, the parameters of the signal analyzer, read test data and the like.
The testing method based on the testing device shown in fig. 1 comprises the following steps:
(1) The computer controls the audio signal generator to send a single-tone modulation signal to the radio station to be tested;
(2) The computer controls the radio station to be tested to be an upper sideband or a lower sideband, and the power level and the working frequency of the radio station to be tested;
(3) Setting a start frequency, a stop frequency, a reference amplitude, a resolution bandwidth and a video bandwidth of the PXA signal analyzer, opening a marker noise function, adjusting the bandwidth, and enabling a preamplifier and Noise Floor Extension (NFE);
(4) The computer controls the tested radio station to enter a transmitting state, and observes whether the power value displayed on the digital power meter is a set rated output power value of the radio station; if yes, entering the next step; if not, checking the working state of the tested radio station;
(5) According to the broadband frequency to be measured, starting to adjust the center frequency of the tuning band-pass filter from the initial frequency, synchronously measuring and reading the noise value at the broadband frequency displayed on the PXA signal analyzer until the maximum band noise value in the range from the initial frequency to the termination frequency of the PXA signal analyzer is obtained;
(6) Calculating the emission broadband noise value of the tested radio station at the working frequency to be equal to the maximum broadband noise value obtained in the step (5), the insertion loss value of the high-power absorption filter and the insertion loss value of the tuning band-pass filter;
(7) The computer sets the working frequency interval of the radio station to be tested, tests the emission broadband noise value of the radio station to be tested in the whole working frequency range, and draws the amplitude-frequency curve graph corresponding to the radio station working frequency and the emission broadband noise value.
The embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by the embodiments, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the present invention.
Claims (4)
1. A high-power empty-load short wave radio station emission broadband noise testing arrangement, its characterized in that: the system comprises an audio signal generator, a digital power meter, a high-power absorption filter, a tuning band-pass filter, a PXA signal analyzer and a computer; the signal output end of the audio signal generator is connected with the signal input end of the tested high-power idle short wave radio station, the signal input end of the digital power meter is connected with the signal output end of the tested high-power idle short wave radio station, the signal input end of the high-power absorption filter is connected with the signal output end of the digital power meter, the signal input end of the tuning band-pass filter is connected with the signal output end of the high-power absorption filter, the signal input end of the PXA signal analyzer is connected with the signal output end of the tuning band-pass filter, the signal input end of the computer is connected with the signal output end of the PXA signal analyzer, and the signal output ends of the tested high-power idle short wave radio station, the audio signal generator, the tuning band-pass filter and the PXA signal analyzer are respectively connected with the signal output ends of the computer;
the high-power absorption filter is used for separating radio station working frequency from broadband noise, adopts a duplexer mode and comprises a high-power high-pass filter, a high-power low-pass filter and a high-power load, wherein signal input ends of the high-power high-pass filter and the high-power low-pass filter respectively receive input signals of the filters, signal output ends of the high-power high-pass filter output signals of the filters, and signal output ends of the high-power low-pass filter are connected with the high-power load.
2. The high-power idle short-wave radio station emission broadband noise testing device according to claim 1, wherein: the tuning band-pass filter is a 5-order Chebyshev filter with adjustable frequency and is used for filtering the content of higher harmonic waves at the broadband frequency when the radio station transmits.
3. The high-power idle short-wave radio station emission broadband noise testing device according to claim 1, wherein: and the computer performs data transmission with other devices through a USB interface, a network port or a serial port.
4. The test method based on the high-power no-load short-wave radio station emission broadband noise test device as claimed in claim 1, is characterized by comprising the following steps:
(1) The computer controls the audio signal generator to send a single-tone modulation signal to the radio station to be tested;
(2) The computer controls the radio station to be tested to be an upper sideband or a lower sideband, and the power level and the working frequency of the radio station to be tested;
(3) Setting the initial frequency, the termination frequency, the reference amplitude, the resolution bandwidth and the video bandwidth of the PXA signal analyzer, opening a marking noise function, adjusting the bandwidth, and starting a preamplifier and noise floor expansion;
(4) The computer controls the tested radio station to enter a transmitting state, and observes whether the power value displayed on the digital power meter is a set rated output power value of the radio station; if yes, entering the next step; if not, checking the working state of the tested radio station;
(5) According to the broadband frequency to be measured, starting to adjust the center frequency of the tuning band-pass filter from the initial frequency, synchronously measuring and reading the noise value at the broadband frequency displayed on the PXA signal analyzer until the maximum band noise value in the range from the initial frequency to the termination frequency of the PXA signal analyzer is obtained;
(6) Calculating the emission broadband noise value of the tested radio station at the working frequency to be equal to the maximum broadband noise value obtained in the step (5), the insertion loss value of the high-power absorption filter and the insertion loss value of the tuning band-pass filter;
(7) The computer sets the working frequency interval of the radio station to be tested, tests the emission broadband noise value of the radio station to be tested in the whole working frequency range, and draws the amplitude-frequency curve graph corresponding to the radio station working frequency and the emission broadband noise value.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012032393A (en) * | 2010-07-07 | 2012-02-16 | Anritsu Corp | Distortion measurement apparatus |
| CN103634024A (en) * | 2013-11-19 | 2014-03-12 | 中国电子科技集团公司第四十一研究所 | Device and method for realizing frequency spread function of signal analyzer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8155904B2 (en) * | 2007-10-05 | 2012-04-10 | Dvorak Steven L | Vector signal measuring system, featuring wide bandwidth, large dynamic range, and high accuracy |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012032393A (en) * | 2010-07-07 | 2012-02-16 | Anritsu Corp | Distortion measurement apparatus |
| CN103634024A (en) * | 2013-11-19 | 2014-03-12 | 中国电子科技集团公司第四十一研究所 | Device and method for realizing frequency spread function of signal analyzer |
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