CN110987015A - Detection method of multipurpose airplane radio altitude simulator - Google Patents
Detection method of multipurpose airplane radio altitude simulator Download PDFInfo
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- CN110987015A CN110987015A CN201911301894.7A CN201911301894A CN110987015A CN 110987015 A CN110987015 A CN 110987015A CN 201911301894 A CN201911301894 A CN 201911301894A CN 110987015 A CN110987015 A CN 110987015A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
- G01C5/005—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels altimeters for aircraft
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
- G01S13/103—Systems for measuring distance only using transmission of interrupted, pulse modulated waves particularities of the measurement of the distance
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Manufacturing & Machinery (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The invention discloses a method for detecting a multipurpose airplane radio altitude simulator, which adopts a signal source to provide a certain pulse modulation signal, the signal is distributed by a power divider, one path of the signal is detected and output by an adjustable attenuator and a detector and is sent to a signal input end of a double-channel time/frequency counter; the other path is output through the radio height simulator and the detector detection and is sent to the other signal input end of the double-channel time/frequency counter; the double-channel time/frequency counter measures the delay time of the two paths of signals, and the height analog value of the radio height simulator can be calculated according to the delay time. The method can realize the detection function with higher accuracy on the time delay parameter of the radio altitude simulator, and has higher popularization and application values in metering calibration of special detection equipment for a multipurpose airplane radio altimeter and the like.
Description
Technical Field
The invention belongs to the technical field of metering of airborne detection equipment, and particularly relates to a metering detection method of a multipurpose aircraft radio altitude simulator.
Background
The multipurpose airplane radio altitude simulator is an important device for detecting an airborne radio altitude meter, and can provide a certain required radio altitude magnitude simulation environment. The radio height magnitude simulation environment is mainly composed of microwave delay lines, is divided into a fixed type and an adjustable type according to the performance structure of the microwave delay lines, and is mainly realized by adopting delay technologies such as a coaxial cable structure, a sound meter (body) wave structure, an FPGA structure and a microwave optical fiber structure.
At present, in the measurement and calibration work of a radio height simulator, the technical method adopted for detecting the radio height analog quantity value is extremely imperfect, even a qualitative inspection substitution mode is adopted, the measurement and detection level and accuracy are poor, and the effectiveness of carrying out quantity value tracing work is insufficient.
Disclosure of Invention
Object of the Invention
The invention provides a method for detecting a multipurpose airplane radio altitude simulator, which mainly adopts equipment accessories such as a signal source, a power divider, an adjustable attenuator, a wave detector, a fixed attenuator, a dual-channel time/frequency counter, an oscilloscope, a high-stability frequency scale and the like, and provides an effective detection technical method for the radio altitude simulation quantity value measurement and calibration work of the radio altitude simulator. The method is simple to operate, large in detection value range and high in accuracy, and can solve the problem of radio altitude simulation value measurement calibration of the current multipurpose airplane radio altitude simulator.
Technical solution of the invention
The method adopts a signal source to provide a certain pulse modulation signal, the signal is distributed by a power divider, one path of the signal is detected and output by an adjustable attenuator and a detector and is sent to a signal input end of a double-channel time/frequency counter; the other path is output through the radio height simulator and the detector detection and is sent to the other signal input end of the double-channel time/frequency counter; the double-channel time/frequency counter measures the delay time of the two paths of signals, and the height analog value of the radio height simulator can be calculated according to the delay time.
Preferably, the method comprises the following steps:
step one, a signal source is connected with a power divider, the power divider is respectively connected with an adjustable attenuator and a fixed attenuator, the fixed attenuator is sequentially connected with a detector I and an oscilloscope, and the adjustable attenuator is sequentially connected with a detector II and the oscilloscope;
step two, electrifying the equipment, adjusting the signal source in a pulse modulation output mode and power to a proper state, and adjusting the adjustable attenuator to ensure that two input channels of the oscilloscope display pulse signals clearly and have basically consistent amplitude;
connecting the signal source and the double-channel time/frequency counter by using high-stability frequency scale equipment to synchronize signals of the signal source and the double-channel time/frequency counter, replacing an oscilloscope by using the double-channel time/frequency counter, measuring and reading delay time of two input channel pulse signals, and recording the delay time as system initial delay T0；
Replacing the fixed attenuator with the radio height simulator, replacing the dual-channel time/frequency counter with the oscilloscope, placing the radio height simulator on the height value to be detected, and adjusting the adjustable attenuator to ensure that pulse signals displayed by two input channels of the oscilloscope are clear and have basically consistent amplitude;
replacing the oscilloscope with a dual-channel time/frequency counter, measuring the delay time of two input channel pulse signals, and recording as a measured value T1；
And step six, calculating the equivalent delay time delta T of the currently detected radio simulation height value and the currently detected radio simulation height measured value H.
And (3) placing the radio simulator 3 at different height values according to the detection requirements of the radio simulator, and repeating the fourth step to the sixth step to finish the detection work required by the whole range.
Preferably, the formula Δ T ═ T in step six1－T0Calculating the equivalent delay time of the current detected radio analog height value. The measured value H of the currently detected radio simulation height is calculated by the formula H ═ Δ T · c/2, where c is the speed of light.
Preferably, the stability of the high-stability frequency standard device is better than 10-10Seconds/hour.
Preferably, the working frequency range of the fixed attenuator and the adjustable attenuator comprises a C wave band.
Preferably, the operating frequency ranges of the first detector and the second detector comprise a C-band.
Preferably, the operating frequency range of the signal source and the power divider includes a C-band.
The invention has the advantages that: the method for detecting the multipurpose aircraft radio altitude simulator can meet the measurement and detection requirements of the radio altitude simulation value range and the accuracy performance of the multipurpose aircraft radio altitude simulator, and has higher popularization and application values in measurement and detection of other radio altitude simulators and similar devices.
Drawings
FIG. 1: the invention discloses a schematic connection relation diagram of all devices in a multi-purpose aircraft radio altitude simulator detection method.
FIG. 2: the multipurpose aircraft radio altitude simulator detection method is a schematic connection diagram of each device during initial delay calibration.
In the figure: 1-a signal source; 2, a power divider; 3-radio altitude simulator; 4-a detector I; 5-adjustable attenuator; 6, a second detector; 7-two-channel time/frequency counter; 8, an oscilloscope; 9-high stable frequency standard equipment; 10-fixed attenuator.
Detailed Description
The invention is realized by the following technical scheme.
A method for detecting a multi-purpose airplane radio altitude simulator comprises the steps that a signal source 1 is adopted to provide a certain pulse modulation signal, the signal is distributed through a power divider 2, one path of signal is output through an adjustable attenuator 5 and a detector through detection, and the signal is sent to a signal input end of a double-channel time/frequency counter 7; the other path is output through the radio height simulator 3 and the detector detection and is sent to the other signal input end of the double-channel time/frequency counter 7; the two-channel time/frequency counter 7 measures the delay time of the two signals, and then the height analog value of the radio height simulator can be calculated according to the delay time.
The method comprises the following steps:
step one, a signal source 1 is connected with a power divider 2, the power divider 2 is respectively connected with an adjustable attenuator 5 and a fixed attenuator 10, the fixed attenuator 10 is sequentially connected with a detector I4 and an oscilloscope 8, the adjustable attenuator 5 is sequentially connected with a detector II 6 and the oscilloscope 8, and the working frequency ranges of the fixed attenuator 10, the adjustable attenuator 5, the detector I4, the detector II 6, the signal source 1 and the power divider 2 comprise a C wave band.
Step two, the equipment is powered on, the signal source 1 is put in a pulse modulation output mode, the power is adjusted to be in a proper state, and the adjustable attenuator 5 is adjusted, so that the two input channels of the oscilloscope 8 display pulse signals clearly and the amplitudes are basically consistent;
thirdly, connecting the signal source 1 and the dual-channel time/frequency counter 7 by using high-stability frequency scale equipment 9 to synchronize signals of the signal source 1 and the dual-channel time/frequency counter 7, replacing the oscilloscope 8 with the dual-channel time/frequency counter 7, measuring and reading delay time of two input channel pulse signals, and recording the delay time as system initial delay T0The stability of the high-stability frequency scale equipment 9 is better than 10-10Second/hour;
replacing the fixed attenuator 10 with the radio height simulator 3, replacing the dual-channel time/frequency counter 7 with the oscilloscope 8, placing the radio height simulator 3 on the height value to be detected, and adjusting the adjustable attenuator 5 to ensure that pulse signals displayed by two input channels of the oscilloscope 8 are clear and have basically consistent amplitude;
step five, replacing the oscilloscope 8 with a dual-channel time/frequency counter 7, measuring the delay time of two input channel pulse signals, and recording the delay time as a measured value T1；
Step six, using the formula delta T ═ T1－T0Calculating the equivalent delay time delta T of the radio simulation height value currently detected, and calculating the actually measured value H of the radio simulation height currently detected by using the formula H, wherein c is the light speed.
And (3) placing the radio simulator 3 at different height values according to the detection requirements of the radio simulator 3, and repeating the fourth step to the sixth step to finish the detection work required by the whole range.
The working principle is as follows: the signal source 1 is responsible for providing a pulse modulated signal meeting the detection requirements, which is distributed by the power divider 2, one path being attenuated by an adjustable attenuationThe detector 5 and the detector II 6 detect the output, and the other path of the output is detected by the radio height simulator 3 and the detector I4; the two-channel time/frequency counter 7 measures the delay time of the pulse signals output by the two-channel detection and changes the value into T according to the formula1－T0And H is delta T.c/2, and the measured value H of the detected radio simulation height is calculated. The adjustable attenuator 5 is used for adjusting the amplitude of the two paths of matched signals, and the detector I4 and the detector II 6 are used for detecting the waveform of the pulse signal; the oscilloscope 8 is used for monitoring the waveform amplitude of the two paths of pulse signals; the high-stability frequency scale device 9 is used for performing high-stability time synchronization between the signal source 1 and the dual-channel time/frequency counter 7; the fixed attenuator 10 is used to provide a certain access loss in place of the radio altitude simulator 3 during initial delay calibration of the system.
The above-mentioned embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (8)
1. The detection method of the multipurpose airplane radio altitude simulator is characterized by comprising the following steps: the method adopts a signal source (1) to provide a certain pulse modulation signal, the signal is distributed by a power divider (2), one path of signal is output by an adjustable attenuator (5) and a detector through detection and is sent to a signal input end of a double-channel time/frequency counter (7); the other path is output through the radio height simulator (3) and the detector detection and is sent to the other signal input end of the double-channel time/frequency counter (7); the double-channel time/frequency counter (7) measures the delay time of the two paths of signals, and the height analog value of the radio height simulator can be calculated according to the delay time.
2. The multi-purpose aircraft radio altitude simulator test method of claim 1, wherein: the method comprises the following steps:
step one, a signal source (1) is connected with a power divider (2), the power divider (2) is respectively connected with an adjustable attenuator (5) and a fixed attenuator (10), the fixed attenuator (10) is sequentially connected with a detector I (4) and an oscilloscope (8), and the adjustable attenuator (5) is sequentially connected with a detector II (6) and the oscilloscope (8);
step two, the equipment is powered on, the output of the signal source (1) is arranged in a pulse modulation mode, the power is adjusted to the working allowable range of the radio height simulator (3), and the adjustable attenuator (5) is adjusted, so that two input channels of the oscilloscope (8) display pulse signals clearly and the amplitudes are basically consistent;
thirdly, connecting the signal source (1) and the dual-channel time/frequency counter (7) by using high-stability frequency scale equipment (9) to synchronize signals of the signal source (1) and the dual-channel time/frequency counter (7), replacing the oscilloscope (8) by using the dual-channel time/frequency counter (7), measuring and reading delay time of two input channel pulse signals, and recording the delay time as system initial delay T0；
Replacing the fixed attenuator (10) with the radio height simulator (3), replacing the dual-channel time/frequency counter (7) with the oscilloscope (8), placing the radio height simulator (3) on the height measurement value to be detected, and adjusting the adjustable attenuator (5) to ensure that pulse signals displayed by two input channels of the oscilloscope (8) are clear and have basically consistent amplitude;
step five, replacing an oscilloscope (8) with a dual-channel time/frequency counter (7), measuring the delay time of two input channel pulse signals, and recording the delay time as a measured value T1；
Step six, calculating the equivalent delay time delta T of the currently detected radio simulation height value and the actually measured value H of the currently detected radio simulation heighti。
3. The multi-purpose aircraft radio altitude simulator test method of claim 1, wherein: and (3) placing the radio simulator (3) at different height values according to the detection requirement of the radio simulator (3), and repeating the fourth step to the sixth step to finish the detection work required by the whole range.
4. The multipurpose aircraft radio altitude simulator of claim 1The detection method is characterized in that: step six, using formula delta T ═ T1－T0Calculating the equivalent delay time of the radio simulation height value currently detected, and calculating the actually measured value H of the radio simulation height currently detected by using the formula H, wherein c is the speed of light.
5. The multi-purpose aircraft radio altitude simulator test method of claim 3, wherein: the stability of the high-stability frequency scale equipment (9) is better than 10-10Seconds/hour.
6. The multi-purpose aircraft radio altitude simulator test method of claim 1, wherein: the working frequency ranges of the fixed attenuator (10) and the adjustable attenuator (5) comprise C wave bands.
7. The multi-purpose aircraft radio altitude simulator test method of claim 1, wherein: the working frequency ranges of the first detector (4) and the second detector (6) comprise C wave bands.
8. The multi-purpose aircraft radio altitude simulator test method of claim 1, wherein: the working frequency ranges of the signal source (1) and the power divider (2) comprise C wave bands.
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| CN201911301894.7A CN110987015A (en) | 2019-12-17 | 2019-12-17 | Detection method of multipurpose airplane radio altitude simulator |
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| CN201911301894.7A CN110987015A (en) | 2019-12-17 | 2019-12-17 | Detection method of multipurpose airplane radio altitude simulator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111473692A (en) * | 2020-04-20 | 2020-07-31 | 电子科技大学 | Testing device and method for irradiation delay of photoelectric emitter |
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Cited By (2)
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| CN111473692A (en) * | 2020-04-20 | 2020-07-31 | 电子科技大学 | Testing device and method for irradiation delay of photoelectric emitter |
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