CN110987020A - Multipurpose airplane precision radio altitude simulator - Google Patents
Multipurpose airplane precision radio altitude simulator Download PDFInfo
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- CN110987020A CN110987020A CN201911335435.0A CN201911335435A CN110987020A CN 110987020 A CN110987020 A CN 110987020A CN 201911335435 A CN201911335435 A CN 201911335435A CN 110987020 A CN110987020 A CN 110987020A
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- 230000003287 optical effect Effects 0.000 claims abstract description 89
- 239000013307 optical fiber Substances 0.000 claims abstract description 46
- 238000006243 chemical reaction Methods 0.000 claims abstract description 44
- 239000011159 matrix material Substances 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000004088 simulation Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 3
- 230000003111 delayed effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000011218 segmentation Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
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- 230000003139 buffering effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/882—Radar or analogous systems specially adapted for specific applications for altimeters
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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
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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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
- G01S7/406—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder
- G01S7/4065—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder involving a delay line
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The invention provides a multipurpose airplane precision radio altitude simulator, which at least comprises a fixed attenuator, an electric/optical conversion module, a program control optical fiber matrix delay module, an optical/electric conversion module, a program control compensation buffer output module, a control module, a radio frequency cable, a control cable, an input interface and an output interface. The multipurpose airplane precision radio altitude simulator provided by the invention adopts the optical fiber delay technology as a precise delay means of radio signals. The optical fiber segmentation and the length of the optical fiber delay matrix unit can be adjusted and controlled according to the requirement; the provided radio height simulation environment magnitude value and the adjustment range are large, the accuracy is high, and the radio height simulation environment magnitude value and the adjustment range have the advantages of being simple in structure, good in universality and the like. The radio altimeter detection system can be used as an independent device and can also be integrated into other related systems, and a superior radio altitude value simulation environment is provided for radio altimeter detection with comprehensive functional performance. The method has higher popularization and application values in the radio altimeter detection.
Description
Technical Field
The invention relates to the technical field of aircraft system testing, in particular to a multipurpose aircraft precision radio altitude simulator, which is used for detecting an airborne radio altitude meter.
Background
The radio altimeter simulator is an essential important device or component in the radio altimeter detection device. The radio altimeter simulation environment is mainly used for providing a radio altimeter simulation environment meeting certain requirements for detection of a radio altimeter, input and output accurate delay is carried out on a signal transmitted by a transceiver of the radio altimeter mainly through a radio signal delay mechanism, and a radio altimeter simulation value H reflected by the delay time T is calculated through a formula H ═ T · c/2(c is the speed of light). The delay time characteristics of the radio altitude simulator for the input and output of the radio signal reflect the environment characteristics of the radio altitude simulation provided by the radio altitude simulator.
The existing radio altimeter simulator mainly adopts signal delay processing technologies such as a coaxial cable delay line, a sound meter body or a sound meter wave delay line, an FPGA structure delay line and the like to form a radio altimeter value simulation environment, has certain functional performance defects in the aspects of device structure, provided simulation parameter value range, accuracy, adjusting capacity and the like, and cannot meet the radio altimeter detection use requirements of multifunctional airplanes with comprehensive functional performance.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the technical defects of the existing radio altimeter simulator in the range of simulation parameter values, accuracy and adjusting capacity, the multipurpose aircraft precision radio altimeter simulator is provided to meet the use requirement of radio altimeter detection of multipurpose aircraft with comprehensive functional performance.
The technical scheme is as follows: the multipurpose aircraft precision radio altitude simulator mainly realizes the functions of program control, accuracy, continuity and adjustability of delay of radio signal input and output through electric/optical signal conversion, optical fiber link delay, optical/electric signal conversion, optical fiber link channel control and signal conversion recovery amplitude compensation control. The multipurpose aircraft precision radio altitude simulator adopts the optical fiber delay technology as a precise delay means of radio signals, and can flexibly adjust and control the optical fiber segmentation and the length of the optical fiber delay matrix unit according to requirements to realize a high-performance radio altitude magnitude simulation environment. According to the radio height measurement technical principle formula H ═ c.T/2 (H is the analog height, c isLight speed delay, T is delay time), the length of each fiber segment can be determined according to the formula T ═ L · nθC (L is the fiber segment length, n)θAs the refractive index of the fiber). The multipurpose aircraft precision radio altitude simulator provided by the invention has the advantages of large radio altitude simulation environment magnitude and adjustment range, high accuracy, simple structure, good universality and the like, can be used as independent equipment, can be integrated into other related systems, and provides a superior radio altitude magnitude simulation environment for radio altimeter detection with comprehensive functional performance.
The invention relates to a multipurpose airplane precision radio altitude simulator, which is realized by at least adopting a fixed attenuator (1), an electric/optical conversion module (2), a programmable optical fiber matrix delay module (3), an optical/electric conversion module (4), a programmable compensation buffer output module (5), a control module (6), a radio frequency cable (9), a control cable (10), an input interface (11), an output interface (12) and a control interface (13);
wherein, the input end of the fixed attenuator (1) is connected with the input interface (11), and the output end is directly connected with the electrical signal input end of the electric/optical conversion module (2); the optical signal output end of the electric/optical conversion module (2) is connected with one end of the programmable optical fiber matrix delay module (3); the other end of the programmable optical fiber matrix delay module (3) is connected with the optical signal input end of the optical/electrical conversion module (4); the electrical signal output end of the optical/electrical conversion module (4) is connected with the input end of the program control compensation buffer output module (5) through a radio frequency cable (9); the output end of the program-controlled compensation buffer output module (5) is connected to the output interface (12); the program control optical fiber matrix delay module (3) and the program control compensation buffer output module (5) are controlled by the control module (6); the power supply for the work of the program control optical fiber matrix delay module (3), the program control compensation buffer output module (5), the electric/optical conversion module (2) and the optical/electric conversion module (4) is also provided by the control module (6) through a control cable (10).
Preferably, the optical signal output end of the electric/optical conversion module (2) is connected with the programmable optical fiber matrix delay module (3) through a first optical signal connector (7); the program-controlled optical fiber matrix delay module (3) is connected with the optical signal input end of the optical/electrical conversion module (4) through a second optical signal connector (8).
Preferably, the control module (6) is provided with a control interface (13) which is used as an external program control and power supply interface of the control module (6); the control interface (13) is connected with a radio altimeter detection control display terminal (14).
Preferably, the input end of the fixed attenuator (1) is integrated with the input interface (11), and the output end of the program-controlled compensation buffer output module (5) is integrated with the output interface (12).
The invention also provides a simulation method based on the simulator, which comprises the following steps:
step 1, connecting and acquiring a radio frequency signal output by a transmitting end of a transceiver of a radio altimeter, and performing attenuation buffer processing;
step 2, performing electric/optical signal conversion on the radio frequency signal subjected to attenuation buffer processing to convert the radio frequency signal into an optical signal;
step 4, recovering and converting the optical signals after the delay processing into electric signals;
and 5, amplifying and compensating the electric signal obtained in the step 4 and then outputting the electric signal.
In step 3, the optical signal is subjected to delay processing in various processing forms, and the delay processing method adopted by the present invention is to change the length of an optical signal transmission path through a series of optical path transmission matrices controlled by optical fibers and optical switching devices with different lengths to realize signal delay parameter requirements with different analog heights, wherein the delay time is calculated according to a formula H ═ c · t)/2, H is the analog height, c is the optical speed, and t is the delay time.
The beneficial technical effects are as follows: the multipurpose aircraft precision radio altitude simulator provided by the invention can adjust and control the optical fiber segmentation and the length of the optical fiber delay matrix unit as required due to the adoption of the optical fiber delay technology as an important signal delay means, has the advantages of large radio altitude simulation environment quantity value and adjustment range, high accuracy, simple structure, good universality and the like, can be used as independent equipment, can be integrated into other related systems, can provide a superior radio altitude quantity value simulation environment for radio altimeter detection with comprehensive functional performance, and has higher application value in multipurpose aircraft radio altimeter detection.
Drawings
FIG. 1 is a schematic diagram of the functional structure composition and connection relationship of the multipurpose aircraft precision radio altitude simulator.
FIG. 2 is a schematic diagram showing the connection relationship between the multi-purpose aircraft precision radio altitude simulator and the use thereof.
In fig. 1: 1-fixed attenuator; 2-an electrical/optical conversion module; 3, a program-controlled optical fiber matrix delay module; 4-optical/electrical conversion module; 5, a program control compensation buffer output module; 6, a control module; 7-a first optical signal connector; 8-a second optical signal connector; 9-radio frequency cable; 10-control cable; 11-an input interface; 12-an output interface; 13-control interface.
In fig. 2: 14-radio altimeter detecting and controlling display terminal; 15-radio altimeter transceiver; 16-an attenuator; 17-electrical detection cables; 18-radio frequency detection cable one; 19-radio frequency detection cable II and 20-radio frequency detection cable III.
Detailed Description
The technical principles and features of the present invention will be described below with reference to the accompanying drawings, which are provided as examples for explaining the present invention and not for limiting the scope of the present invention.
1. The invention has the following structural components: the multipurpose aircraft precision radio altitude simulator comprises a fixed attenuator (1), an electric/optical conversion module (2), a program-controlled optical fiber matrix delay module (3), an optical/electric conversion module (4), a program-controlled compensation buffer output module (5), a control module (6), a first optical signal connector (7), a second optical signal connector (8), a radio frequency cable (9), a control cable (10), an input interface (11), an output interface (12) and a control interface (13).
2. The device of the invention has the following installation and connection relations: the multipurpose aircraft precision radio altitude simulator is installed and connected in the following relationship: one end of the fixed attenuator (1) is directly connected with the electrical signal input end of the electric/optical conversion module (2); the optical signal output end of the electric/optical conversion module (2) is connected with one end of the programmable optical fiber matrix delay module (3) through a first optical signal connector (7); the other end of the program-controlled optical fiber matrix delay module (3) is connected with the optical signal input end of the optical/electrical conversion module (4) through a second optical signal connector (8); the electrical signal output end of the optical/electrical conversion module (4) is connected with the input end of the program control compensation buffer output module (5) through a radio frequency cable (9); the programmable optical fiber matrix delay module (3), the programmable compensation buffer output module (5), the electric/optical conversion module (2), the optical/electric conversion module (4) and the control module (6) are connected through a control cable (10), and in order to enable the multipurpose aircraft precision radio altitude simulator provided by the invention to be simpler, the input interface (11), the output interface (12) and the control interface (13) can be integrally designed with the connection position of the simulator.
3. The functional function of each component unit of the invention is as follows: as shown in fig. 1, the main functions of the multi-purpose aircraft precision radio altitude simulator are as follows:
a. the multipurpose aircraft precision radio altitude simulator adopts an AC/DC power supply module or a DC/DC power supply module to supply direct current power, and provides direct current working power for a program control optical fiber matrix delay module (3), a program control compensation buffer output module (5), an electric/optical conversion module (2) and an optical/electric conversion module (4) through a control module (6).
b. The fixed attenuator (1) mainly plays a role in attenuating and buffering an input signal.
c. The electric/optical conversion module (2) mainly converts a radio frequency input signal into an optical signal.
d. The programmable optical fiber matrix delay module (3) mainly realizes the optical signal delay function of different transmission distances through an optical path transmission matrix controlled by a series of optical fibers with different lengths and optical switching devices in a combined manner, and the delay amount t represents a certain analog height value according to a formula H ═ c.t)/2 (H is analog height, c is light speed delay, and t is delay time).
e. The optical/electrical conversion module (4) is mainly used for recovering and converting optical signals into electrical signals.
f. The programmable compensation buffer output module (5) mainly plays a role in amplifying and compensating signal delay loss.
g. The control module (6) is mainly used for controlling the delay amount of the programmable control optical fiber matrix delay module (3) and the amplification compensation multiple of the programmable control compensation buffer output module (5) and providing direct current power supply for the programmable control compensation buffer output module (5), the electric/optical conversion module (2) and the optical/electric conversion module (4).
h. The first optical signal connector (7) and the second optical signal connector (8) are mainly used for realizing optical signal connection between the photoelectric components.
i. The radio frequency cable (9) mainly realizes the connection of radio frequency signals.
j. The control cable (10) is mainly used for realizing the electrical connection of control signals and power supply.
4. The working use and technical principle of the invention are as follows: as shown in fig. 2, the multipurpose aircraft precision radio altitude simulator provided by the invention is applied to an aircraft test system, and the following principles and components are taken as examples of signal input, output and control when a radio altimeter transceiver detects use:
a. a radio altimeter detection control display terminal (14) is respectively connected to a control interface (13) of the multipurpose aircraft precision radio altitude simulator and an electric socket of a radio altimeter transceiver (16) through an electric detection cable (17).
b. The transmitting output of the transceiver (16) of the radio altimeter is connected to the input end of the attenuator (15) through a radio frequency detection cable II (19), and the output end of the attenuator (15) is connected to the input interface (11) of the multipurpose airplane precision radio altitude simulator through a radio frequency detection cable I (18).
c. The output interface (12) of the multipurpose aircraft precision radio altitude simulator is connected to the radio frequency receiving end of a radio altimeter transceiver (16) through a radio frequency detection cable III (20).
d. The radio altimeter detection control display terminal (14) provides working power supply for the radio altimeter transceiver (16) and the multipurpose airplane precision radio altitude simulator.
e. Radio frequency signals transmitted and output by a transceiver (16) of the radio altimeter are output to an input interface (11) of the multipurpose airplane precision radio altitude simulator through an attenuator (15), and the signals are buffered through a fixed attenuator (1), converted by an electric/optical conversion module (2) into electric/optical signals, delayed by a programmable optical fiber matrix delay module (3), recovered by an optical/electrical signal through an optical/electrical conversion module (4) and compensated and amplified by a programmable compensation buffer output module (5), and then output to return to a radio frequency receiving end of the transceiver (16) of the radio altimeter;
f. the radio altimeter detection control display terminal (14) controls the delay amount of the program control optical fiber matrix delay module (3) through the control interface (13) of the multipurpose airplane precision radio altitude simulator, and compares the altitude data transmitted and displayed by the radio altimeter transceiver (16) through the electric detection cable (17) with the altitude value represented by the delay amount calculation, so that the function of detecting the high performance parameter measured by the radio altimeter transceiver can be realized.
Because the delay of the programmable optical fiber matrix delay module (3) is mainly formed by combining single-mode optical fibers with different lengths and optical switching devices, the size of the delay is mainly determined by the optical fiber combination length of an optical signal transmission channel, and the length of the optical fibers can be accurately controlled by measurement and debugging in the manufacturing and debugging process of the programmable optical fiber matrix delay module (3), the simulated height parameter realized by the multipurpose aircraft precision radio height simulator has higher precision.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (10)
1. Multipurpose aircraft precision radio altitude simulator, its characterized in that: the simulator at least comprises a fixed attenuator (1), an electric/optical conversion module (2), a programmable optical fiber matrix delay module (3), an optical/electric conversion module (4), a programmable compensation buffer output module (5), a control module (6), a radio frequency cable (9), a control cable (10), an input interface (11) and an output interface (12);
wherein, the input end of the fixed attenuator (1) is connected with the input interface (11), and the output end is directly connected with the electrical signal input end of the electric/optical conversion module (2); the optical signal output end of the electric/optical conversion module (2) is connected with one end of the programmable optical fiber matrix delay module (3); the other end of the programmable optical fiber matrix delay module (3) is connected with the optical signal input end of the optical/electrical conversion module (4); the electrical signal output end of the optical/electrical conversion module (4) is connected with the input end of the program control compensation buffer output module (5) through a radio frequency cable (9); the output end of the program-controlled compensation buffer output module (5) is connected to the output interface (12); the program control optical fiber matrix delay module (3) and the program control compensation buffer output module (5) are controlled by the control module (6); the power supply for the work of the program control optical fiber matrix delay module (3), the program control compensation buffer output module (5), the electric/optical conversion module (2) and the optical/electric conversion module (4) is also provided by the control module (6) through a control cable (10).
2. The multipurpose aircraft precision radio altitude simulator of claim 1, wherein: and the optical signal output end of the electric/optical conversion module (2) is connected with the program control optical fiber matrix delay module (3) through a first optical signal connector (7).
3. The multipurpose aircraft precision radio altitude simulator of claim 1 or 2, wherein: the program-controlled optical fiber matrix delay module (3) is connected with the optical signal input end of the optical/electrical conversion module (4) through a second optical signal connector (8).
4. The multipurpose aircraft precision radio altitude simulator of claim 1, wherein: and a control interface (13) is arranged on the control module (6) and is used as an external program control and power supply interface of the control module (6).
5. The multipurpose aircraft precision radio altitude simulator of claim 1, wherein: the control interface (13) is connected with a radio altimeter detection control display terminal (14).
6. The multipurpose aircraft precision radio altitude simulator of claim 1, wherein: the input end of the fixed attenuator (1) is integrated with the input interface (11), and the output end of the program control compensation buffer output module (5) is integrated with the output interface (12).
7. The multipurpose aircraft precision radio altitude simulator of any one of claims 1-6, wherein: the simulator is integrated in an aircraft radio altimeter test system.
8. A simulation method of a multipurpose aircraft precision radio altitude simulator as claimed in claim 7, the method comprising the steps of:
step S1, connecting and acquiring the radio frequency signal transmitted and output by the transceiver of the radio altimeter;
step S2, the obtained radio frequency signal is converted into electric/optical signal and converted into optical signal;
step S3, performing delay processing on the optical signal;
step S4, converting the delayed optical signal into electric signal;
step S5, the electric signal obtained in step S4 is amplified and compensated and then output.
9. The simulation method according to claim 8, wherein the radio frequency signal obtained in step S1 is buffered.
10. The simulation method according to claim 8, wherein in step S3, the delay processing is performed on the optical signals with different transmission distances through a series of optical path transmission matrices controlled by optical fiber and optical switch device combinations with different lengths, the delay time is calculated according to the formula H ═ c · T)/2, H is the simulation height, c is the speed of light, and T is the delay time; the length of each optical fiber segment is determined according to formula Ti＝L·nθC is calculated as LSegment length of optical fiber, nθIs the refractive index of the fiber.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534079A (en) * | 2021-08-03 | 2021-10-22 | 中国人民解放军海军航空大学青岛校区 | Radio frequency signal delay and attenuation structure of radio height detector |
| WO2021194648A3 (en) * | 2020-02-12 | 2021-12-23 | Viavi Solutions Inc. | Altimeter testing device and methods |
| CN113965277A (en) * | 2021-11-05 | 2022-01-21 | 江西洪都航空工业集团有限责任公司 | Method, device and system for testing radio altimeter in closed environment |
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