CN109799489B - Altimeter simulator and simulation method thereof - Google Patents
Altimeter simulator and simulation method thereof Download PDFInfo
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- CN109799489B CN109799489B CN201811071164.8A CN201811071164A CN109799489B CN 109799489 B CN109799489 B CN 109799489B CN 201811071164 A CN201811071164 A CN 201811071164A CN 109799489 B CN109799489 B CN 109799489B
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- 238000004088 simulation Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 30
- 230000003321 amplification Effects 0.000 claims abstract description 23
- 239000011159 matrix material Substances 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010897 surface acoustic wave method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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- 238000011056 performance test 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
-
- 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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- Computer Networks & Wireless Communication (AREA)
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses an altimeter simulator and a simulation method, wherein the simulator comprises a pre-stage amplification module, a post-stage amplification module, a local oscillator module, a binary delay line switch matrix, a pre-mixer, a post-mixer, a link A first switch, a link A second switch, a link B first switch and a link B second switch, wherein the link A first switch is connected with the link A second switch to form a first-stage altitude simulation link A, and the link B first switch is connected with the link B second switch to form a second-stage altitude simulation link B. The invention effectively reduces the simulation time delay of 'absolute 0 m' of the altimeter simulator, reduces the simulation time delay to 2.5ns, further reduces the actual simulation height corresponding to the 'absolute 0 m' to 0.375m, effectively improves the altitude simulation precision of the altimeter simulator, ensures that the altimeter simulator is more accurate and reasonable when the altimeter simulator is used for checking the altimeter, and is beneficial to improving the test precision of the altimeter.
Description
Technical Field
The invention relates to the field of radio altitude measurement, in particular to an analog altimeter simulator and an analog method.
Background
Radio altimeters are indispensable devices on aircraft, which are used to measure the distance of the aircraft to the surface of the earth. The principle is that a transmitter and a receiver of a radio altimeter are arranged on the airplane, and the altitude from the ground to the airplane is determined by measuring the propagation delay time of the round-trip electromagnetic waves. The altimeter simulator is a key device for carrying out comprehensive performance test on the radio altimeter, and can continuously simulate echo signals of the radio altimeter at various heights so as to finish the height test of the altimeter.
Currently, altimeter simulators in the market are mainly divided into two types, one is a digital altimeter simulator, and the other is an analog altimeter simulator. The digital altimeter simulator adopts a digital delay chip to store the signal inside, and transmits the signal after storing for a certain time. The advantages are small volume, easy to realize any height simulation, bad place is that the delay time can not be too short when the digital chip processes the signal, generally the shortest is about 700ns (the delay time of 700ns is converted into the corresponding height of 105 m), and the digital chip has serious stray and is not easy to process when processing the signal; the principle of the analog altimeter simulator is that the surface acoustic wave delay line is used as a main delay device, the precision of the analog altimeter simulator depends on the plate-making precision, the consistency and the precision of products are very easy to guarantee, extra correction compensation is not needed, a binary delay line switch matrix is convenient to form, the binary delay line switch matrix is that the height of the binary delay line switch matrix is arranged according to binary, and large-range, high-precision and continuous height simulation is realized by adopting a small number of delay lines.
The analog altimeter simulator adopts the surface acoustic wave delay line technology, the minimum delay time of the existing surface acoustic wave delay line can be 53ns (the delay time of 53ns is converted into the corresponding height of about 8 m), and the height simulation below 8m adopts a wire winding mode and binary combination, so that the height simulation precision of the altimeter simulator can be greatly improved. However, the working frequency of the acoustic surface wave delay line is generally at least 800MHz, the combination of wire winding and binary system requires to be accessed into an up-down frequency conversion component, and the access device can increase the delay time so as to improve the lower limit of absolute 0m of the altimeter simulator. The absolute 0 meter is that when each altimeter simulator is set to return to 0, theoretically, analog signals have no delay, but certain delay time T is generated in the simulators by devices and wires of the actual analog signals, so that the altimeter simulator can always make the actual analog height corresponding to the return-to-0 value during the altimeter test greater than 0m due to the delay time T when testing the altimeter, and the absolute 0m value cannot be reached. For example: the simulation time delay of the existing 0-8000m altimeter simulator 'absolute 0 m' is 20ns (corresponding to the actual height being 3 m), and the simulation time delay of the 127m altimeter simulator 'absolute 0 m' is about 10ns (corresponding to the actual height being 1.5 m). Therefore, an altimeter simulator with the simulated height of 0-8000m is actually an altimeter simulator with the height of 3-8003m, and an altimeter simulator with the simulated height of 0-127m is actually an altimeter simulator with the height of 1.5-128.5 m.
Disclosure of Invention
The present invention is directed to solving the above problems and to providing an altimeter simulator and a method for simulating the same.
In a first aspect, the present invention provides an altimeter simulator, comprising a pre-amplification module, a post-amplification module, a local oscillator module, a binary delay line switch matrix, a front mixer, a post-mixer, a link a first switch, a link a second switch, a link B first switch, and a link B second switch, wherein the pre-amplification module is connected to the front mixer, the front mixer is connected to the binary delay line switch matrix, the binary delay line switch matrix is connected to the post-mixer, the post-mixer is connected to the post-amplification module, the local oscillator module is respectively connected to the front mixer and the post-mixer, the link a first switch is disposed in the pre-amplification module, the link B first switch is disposed between the pre-amplification module and the front mixer, and the link a second switch is disposed in the post-amplification module, the link B second switch is arranged between the rear mixer and the rear-stage amplification module, the link A first switch is connected with the link A second switch to form a first-stage height simulation link A, and the link B first switch is connected with the link B second switch to form a second-stage height simulation link B.
Further, the post-stage amplification module comprises a post-stage amplifier, a filter and a post-stage attenuator, the post-stage amplifier is connected with the filter, the filter is connected with the post-stage attenuator, and the link a second switch is arranged between the filter and the post-stage attenuator.
Further, the pre-amplifier module comprises a pre-attenuator and a pre-amplifier, and the link a first switch is disposed between the pre-attenuator and the pre-amplifier.
Further, the link a first switch, the link a second switch, the link B first switch and the link B second switch are all single-pole double-throw switches.
In a second aspect, the present invention provides a method for simulating altitude, the method comprising: initializing a simulator, setting a height simulation main link, setting a first level height simulation link A, setting a second level height simulation link B, and preparing height simulation:
selecting a first-level height simulation link A, switching a first switch of the link A and a second switch of the link A to the link A, and starting first-level height simulation;
selecting a second-level height simulation link B, switching a first switch of the link A and a second switch of the link A to a main link, switching a first switch of the link B and a second switch of the link B to the link B, and starting second-level height simulation;
and selecting the altitude simulation main link, switching the first switch of the link A, the second switch of the link A, the first switch of the link B and the second switch of the link B to the main link, and starting the altitude simulation main link simulation.
Further, the link a first switch and the link a second switch between the main link and the link a, and the link B first switch and the link B second switch between the main link and the link B.
The invention has the beneficial effects that:
compared with the existing altimeter simulator, the invention is additionally provided with two altitude simulation links, a first switch of the link A is connected with a second switch of the link A to form a first-level altitude simulation link A, and a first switch of the link B is connected with a second switch of the link B to form a second-level altitude simulation link B.
The absolute 0m of the altimeter simulator is corresponding to the first level height analog link A, and the second level height analog link B is set for raising the height step precision. The invention effectively reduces the simulation time delay of 'absolute 0 m' of the altimeter simulator, reduces the simulation time delay of 'absolute 0 m' of the altimeter simulator to 2.5ns (corresponding to the actual height of 0.375 m), namely reduces the actual simulation height of 'absolute 0 m' to 0.375m, effectively improves the altitude simulation precision of the altimeter simulator, ensures that the altimeter simulator is more accurate and reasonable when checking the altimeter, is favorable for improving the altimeter test precision, ensures that the altimeter of the aircraft has more intuitive embodiment on an engineer (or an operator), and ensures that the engineer has better control on the altitude and safe running of the aircraft.
Drawings
FIG. 1: the simulator of the invention has a principle structure diagram;
FIG. 2: the invention relates to a principle structure diagram of a binary delay line switch matrix in a simulator;
FIG. 3: the invention relates to a flow chart of a simulation method.
Detailed Description
The present invention is further illustrated by the following figures and examples, including but not limited to the following examples.
As shown in fig. 1, the altimeter simulator provided by the present invention comprises a pre-amplification module, a post-amplification module, a local oscillator module, a binary delay line switch matrix, a pre-mixer, a post-mixer, a link a first switch, a link a second switch, a link B first switch, and a link B second switch, wherein the pre-amplification module is connected to the pre-mixer, the pre-mixer is connected to the binary delay line switch matrix, the binary delay line switch matrix is connected to the post-mixer, the post-mixer is connected to the post-amplification module, the local oscillator module is respectively connected to the pre-mixer and the post-mixer, the link a first switch is disposed in the pre-amplification module, the link B first switch is disposed between the pre-amplification module and the pre-mixer, the link a second switch is disposed in the post-amplification module, the link B second switch is disposed between the post-mixer and the post-amplification module, the first switch of the link A is connected with the second switch of the link A to form a first-level height simulation link A, and the first switch of the link B is connected with the second switch of the link B to form a second-level height simulation link B.
The first switch of the link A, the second switch of the link A, the first switch of the link B and the second switch of the link B are all single-pole double-throw switches. The pre-stage amplification module comprises a pre-stage attenuator and a pre-stage amplifier, and a first switch of the link A is arranged between the pre-stage attenuator and the pre-stage amplifier. The post-stage amplification module comprises a post-stage amplifier, a filter and a post-stage attenuator, the post-stage amplifier is connected with the filter, the filter is connected with the post-stage attenuator, and the link A second switch is arranged between the filter and the post-stage attenuator. It should be noted that in the prior art, the filter is connected after the post-stage attenuator, but in the present invention, in order to ensure that the delay of the surface acoustic wave signal passing through the link a is minimized, the filter is moved to the front of the post-stage attenuator, because the actually measured delay of the signal passing through the filter is 4ns, and the delay of the signal passing through the attenuator is 1.2ns, and the delay of the signal passing through the filter is 2.8ns more than that of the attenuator, so the link a selects to pass through the post-stage attenuator instead of the filter. In addition, in the invention, in order to reduce the time delay and optimize the time delay of the filter, the time delay of the current signal passing through the filter is optimized and reduced to 2.9 ns.
As shown in fig. 3, the method for simulating altitude provided by the present invention includes: initializing a simulator, setting a height simulation main link, setting a first-level height simulation link A, setting a second-level height simulation link B, and preparing height simulation:
selecting a first-level height simulation link A, switching a first switch of the link A and a second switch of the link A to the link A, and starting first-level height simulation; selecting a second-level height simulation link B, switching a first switch of the link A and a second switch of the link A to a main link, switching a first switch of the link B and a second switch of the link B to the link B, and starting second-level height simulation; and selecting a height simulation main link, switching a first switch of the link A, a second switch of the link A, a first switch of the link B and a second switch of the link B to the main link, and starting the simulation of the height simulation main link.
The link a first switch and the link a second switch between the main link and the link a, and the link B first switch and the link B second switch between the main link and the link B.
As shown in fig. 1, the simulation path of the existing altimeter simulator has only one main link, and the path is: the front stage amplifying module → the front mixer → the binary delay line switch matrix → the rear mixer → the rear stage amplifying module. It is worth noting that in its "absolute 0 m" simulation, as shown in fig. 2, the binary delay line switch matrix has all its switches switched into the pass. For example, the simulation time delay of "absolute 0 m" for a 0-8000m altimeter simulator in the prior art is shown in Table 1:
TABLE 1
As can be seen from Table 1, the simulation time delay for the 0-8000m altimeter simulator "absolute 0 m" is 20ns (corresponding to an actual altitude of 3 m) using the prior art. Therefore, the practical simulation height of the 0-8000m altimeter simulator is 3-8003 m.
The first-level altitude simulation link A is a simulation path of an altimeter simulator 'absolute 0 m', and the simulation path is as follows: the front stage attenuator → the rear stage attenuator, when simulating, the first switch of the link A and the second switch of the link A are both switched to the link A, the first stage height simulation is started, and the simulation time delay of the first stage height simulation link A is as shown in the table 2:
TABLE 2
The total time delay of a signal passing through the first-level height simulation link A is 2.5ns (the corresponding actual height is 0.375 m), namely, an altimeter simulator of 0-8000m adopts the technical scheme of the invention, the actual height value corresponding to 'absolute 0 m' is 0.375m, compared with the existing actual height value of 'absolute 0 m' of 3m, the simulation time delay of absolute 0m is greatly reduced, the actual height value corresponding to 'absolute 0 m' is further reduced, and the simulation precision is improved.
In order to improve the stepping precision of the simulation height, a second-level height simulation link B is additionally arranged, and the path of a signal walking link B is as follows: front stage amplification module → back stage amplification module, simulation delay table is as in table 3:
TABLE 3
As can be seen from table 3, the simulation delay of the signal traveling through the second-level height simulation link B is 6.8ns (corresponding to an actual height of 1.05 m), and the setting of the second-level height simulation link B can increase the step precision of the height. And then if the height is further stepped, selecting a height simulation main link, and realizing binary stepping of the simulation height through a binary delay line switch matrix in the main link.
In summary, the invention is provided with a link A first switch, a link A second switch, a link B first switch and a link B second switch at proper positions on a main link of an altimeter simulator, which is equivalent to adding two altitude simulation links, a first level altitude simulation link A is formed by connecting the link A first switch with the link A second switch, and a second level altitude simulation link B is formed by connecting the link B first switch with the link B second switch. The first-level height simulation link A is used as a simulation path of the altimeter simulator 'absolute 0 m', the simulation path of the existing altimeter simulator 'absolute 0 m' is changed, the simulation time delay is greatly reduced, the actual simulation height corresponding to the 'absolute 0 m' of the altimeter simulator is reduced to 0.375m, and in addition, the second-level height simulation link B is arranged, and the stepping precision of height simulation is improved.
Claims (4)
1. An altimeter simulator, comprising: the system comprises a pre-stage amplification module, a post-stage amplification module, a local oscillator module, a binary delay line switch matrix, a pre-mixer, a post-mixer, a link A first switch, a link A second switch, a link B first switch and a link B second switch, wherein the pre-stage amplification module comprises a pre-stage attenuator and a pre-stage amplifier, and the post-stage amplification module comprises a post-stage amplifier, a filter and a post-stage attenuator; the pre-amplifier is connected with the pre-mixer through the first switch of the link B, the pre-mixer is connected with the binary delay line switch matrix, the binary delay line switch matrix is connected with the rear frequency mixer, the local oscillator module is respectively connected with the front frequency mixer and the rear frequency mixer, the link A first switch is arranged in the pre-amplification module, the link B first switch is arranged between the pre-amplification module and the front mixer, the link A second switch is arranged in the post-stage amplification module, the post-mixer is connected with the post-stage amplifier through the link B second switch, the first switch of the link A is connected with the second switch of the link A to form a first-level height simulation link A, the first switch of the link B is connected with the second switch of the link B to form a second-level height simulation link B; the post amplifier is connected with the filter, and the filter is connected with the post attenuator through the second switch of the link A; the pre-stage attenuator is connected with the pre-stage amplifier through the first switch of the link A.
2. The altimeter simulator of claim 1, wherein: the first switch of the link A, the second switch of the link A, the first switch of the link B and the second switch of the link B are all single-pole double-throw switches.
3. A method of simulating altitude using the altimeter simulator of claim 1, wherein: initializing a simulator, setting a height simulation main link, setting a first-level height simulation link A, setting a second-level height simulation link B, and preparing height simulation:
selecting a first-level height simulation link A, switching a first switch of the link A and a second switch of the link A to the link A, and starting first-level height simulation;
selecting a second-level height simulation link B, switching a first switch of the link A and a second switch of the link A to a main link, switching a first switch of the link B and a second switch of the link B to the link B, and starting second-level height simulation;
and selecting the altitude simulation main link, switching the first switch of the link A, the second switch of the link A, the first switch of the link B and the second switch of the link B to the main link, and starting the altitude simulation main link simulation.
4. A method of simulating altitude according to claim 3, wherein: the link A first switch and the link A second switch between the main link and the link A, and the link B first switch and the link B second switch between the main link and the link B.
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| CN107576944A (en) * | 2017-08-15 | 2018-01-12 | 成都普诺科技有限公司 | Change radiofrequency signal delay time remote analog system |
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2018
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Denomination of invention: A altimeter simulator and its simulation method Granted publication date: 20220614 Pledgee: Chengdu Rural Commercial Bank Co.,Ltd. high tech sub branch Pledgor: CHENGDU ZHONGZHITIANCHENG TECHNOLOGY Co.,Ltd. Registration number: Y2024510000079 |