CN110850395A - Radio altitude simulation device and method - Google Patents
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- 230000003287 optical effect Effects 0.000 claims abstract description 104
- 239000013307 optical fiber Substances 0.000 claims abstract description 99
- 238000012545 processing Methods 0.000 claims abstract description 18
- 230000003321 amplification Effects 0.000 claims abstract description 12
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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
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
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Abstract
The embodiment of the invention discloses a radio altitude simulation device and a radio altitude simulation method, wherein the device comprises the following components: the optical transmitter, the optical receiver, the optical fiber and the power divider; the optical transmitter can receive the frequency modulation continuous wave signal sent by the altimeter, and converts the frequency modulation continuous wave signal into an optical signal after performing filtering, frequency modulation, phase locking, amplification and other links on the received frequency modulation continuous wave signal, and sends the optical signal to the optical receiver through an optical fiber; the optical receiver can convert an optical signal transmitted by the optical fiber into an electric signal, and performs amplification, shaping and other processing on the electric signal to generate a frequency modulation continuous wave signal for simulating the sending of the altimeter and send the frequency modulation continuous wave signal to the power divider; the power divider can perform power division processing on the input frequency modulation continuous wave signal to generate an echo signal. The embodiment of the invention solves the problem that in the existing mode of measuring the height by radio, the measurement height generates a large error because the frequency offset technology is completely adopted.
Description
Technical Field
The present application relates to, but not limited to, the field of radio measurement technologies, and more particularly, to a radio altitude simulation apparatus and method.
Background
Whether the performance of the radio altimeter meets the overall technical index requirements of the product needs to be verified by various performance index tests.
In the semi-physical simulation test, whether the radio altimeter can normally respond to the command signal sent by the control system and whether the radio echo signal can be normally sent and received needs to be checked. Since the real spatial relative position relationship cannot be simulated on the ground, if the frequency offset technology is completely adopted as in the existing radio altimetry technology, a great error will be generated in the altitude.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a radio height simulation apparatus and method to solve the problem that in the existing manner of measuring height by radio, a frequency offset technique is completely adopted, so that a large error is generated in the measured height.
The embodiment of the invention provides a radio altitude simulation device, which comprises: the optical fiber power divider comprises an optical transmitter, an optical receiver, an optical fiber connected between the optical transmitter and the optical receiver, and a power divider connected with the optical receiver;
the optical transmitter is configured to receive the frequency modulated continuous wave signal sent by the altimeter, perform filtering, frequency modulation, phase locking, amplification and other links on the received frequency modulated continuous wave signal, convert the frequency modulated continuous wave signal into an optical signal, and send the optical signal to the optical receiver through an optical fiber;
the optical receiver is configured to convert an optical signal transmitted through an optical fiber into an electrical signal, amplify and shape the electrical signal, generate a frequency modulation continuous wave signal for simulating the sending of the altimeter, and send the frequency modulation continuous wave signal to the power divider;
the power divider is configured to perform power division processing on the input frequency-modulated continuous wave signal to generate an echo signal.
Alternatively, in the radio altitude simulation apparatus as described above,
the length of the optical fiber is part or all of the height gauge.
Optionally, in the radio height simulation apparatus as described above, the power divider performs power division processing on the input frequency-modulated continuous wave signal, and includes:
the power divider is configured to divide the power of the input frequency-modulated continuous wave signal into equal or unequal power, and then generate and output an echo signal.
Optionally, in the radio height simulation apparatus as described above, the number of the optical transmitters, the optical receivers and the optical fibers is equal, and the optical transmitters, the optical receivers and the optical fibers are arranged in a one-to-one correspondence manner, and the radio height simulation apparatus further includes: the single-pole multi-throw microwave switch is respectively connected with the input end of each optical transmitter;
the single-pole multi-throw microwave switch is configured to selectively conduct the multipath optical transmitter through switch control.
Optionally, in the radio height simulation apparatus as described above, four optical fiber paths are included in the radio height simulation apparatus, where a length of the first optical fiber in the first path is H1 meters, a length of the second optical fiber in the second path is H2 meters, a length of the third optical fiber in the third path is H3 meters, and a length of the fourth optical fiber in the fourth path is H4 meters, where H1> H2> H3> H4.
Optionally, in the radio altitude simulation apparatus as described above, the first optical fiber is used for simulating the altitude of the altimeter above H1 m, the second optical fiber is used for simulating the altitude of the altimeter between H2 m and H1 m, the third optical fiber is used for simulating the altitude of the altimeter between H3 m and H2 m, and the fourth optical fiber is used for simulating the altitude of the altimeter below H4 m and H3 m.
The embodiment of the present invention further provides a radio altitude simulation method, which is executed by using the radio altitude simulation apparatus according to any one of the above embodiments, and includes:
receiving a frequency modulation continuous wave signal sent by an altimeter, and converting the frequency modulation continuous wave signal into an optical signal after performing link processing such as filtering, frequency modulation, phase locking, amplification and the like on the received frequency modulation continuous wave signal;
transmitting an optical signal to an optical receiver through an optical fiber, wherein the optical fiber is used for simulating part or all of the height of the altimeter;
converting an optical signal received after optical fiber transmission into an electric signal, and performing amplification, shaping and other processing on the electric signal to generate a frequency modulation continuous wave signal for simulating the altimeter;
and performing power division processing on the frequency modulation continuous wave signal to generate an echo signal.
Optionally, in the radio altitude simulation method described above, when the optical fiber is used to simulate a part of the altitude of the altimeter, the altitude simulation method further includes:
and simulating the height of the other part of the altimeter by adopting a frequency offset mode.
According to the radio altitude simulation device and the radio altitude simulation method provided by the embodiment of the invention, the radio altitude simulation device simulates part or all of the altimeters by the optical fibers, so that the radio altitude simulation device has good universality, and because a plurality of optical fiber channels can be arranged, the simulation of multi-model radio altitude echo signals can be realized in an aircraft ground test; in addition, the simulation of the echo signal of the frequency modulation continuous wave is more vivid and credible through the optical fiber simulation height; furthermore, the embodiment of the invention adopts the mode of reducing the radio echo signal error by the optical fiber, can comprehensively check various dynamic/static indexes of the frequency modulation continuous wave radio altimeter in various limit states by gating the optical fibers with different lengths according to different heights in a limited indoor space, thereby obtaining more test data, providing theoretical support for further improving the height measurement performance of the radio altimeter, more comprehensively checking the overall performance index of the product and providing technical support for the final external field test.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a radio altitude simulation apparatus according to an embodiment of the present invention;
fig. 2 is a height test curve obtained without using the radio height simulation apparatus provided in the embodiment of the present invention;
fig. 3 is a height test curve obtained by using the radio height simulation apparatus provided by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The technical solution provided by the present invention is explained in detail by several specific examples below. The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
The embodiment of the invention provides a radio height simulation device. The radio altitude simulation apparatus may include: the optical fiber power divider comprises an optical transmitter, an optical receiver, an optical fiber connected between the optical transmitter and the optical receiver, and a power divider connected with the optical receiver;
the optical transmitter in the embodiment of the invention is configured to receive a frequency modulation continuous wave signal sent by the altimeter, and convert the frequency modulation continuous wave signal into an optical signal after performing link processing such as filtering, frequency modulation, phase locking, amplification and the like on the received frequency modulation continuous wave signal, and send the optical signal to the optical receiver through an optical fiber;
the optical receiver is configured to convert the optical signal transmitted by the optical fiber into an electrical signal, amplify, shape and the like the electrical signal, generate a frequency modulation continuous wave signal for simulating the sending of the altimeter and send the frequency modulation continuous wave signal to the power divider;
the power divider is configured to perform power division processing on the input frequency-modulated continuous wave signal to generate an echo signal.
The length of the optical fiber in the embodiment of the invention is part or all of the height gauge.
The power divider in the embodiment of the invention performs power division processing on an input frequency modulation continuous wave signal, and the power division processing comprises the following steps:
the power divider is configured to divide the power of the input frequency-modulated continuous wave signal into equal or unequal paths of power, and then generate and output an echo signal.
Optionally, fig. 1 is a schematic structural diagram of a radio altitude simulation apparatus according to an embodiment of the present invention. In the embodiment of the present invention, the number of the optical transmitters, the optical receivers and the optical fibers is equal, and the optical transmitters, the optical receivers and the optical fibers are arranged in a one-to-one correspondence manner, and the radio height simulation apparatus may further include: and the single-pole multi-throw microwave switch is respectively connected with the input end of each optical transmitter.
The single pole, multiple throw microwave switch 1 illustrated in fig. 1 may be a high isolation reflective switch configured to selectively conduct multiple optical transmitters through switch control.
In fig. 1, 4 optical transmitters are illustrated, comprising: optical transmitter 2, optical transmitter 4, optical transmitter 6, optical transmitter 8; 4 optical fibers comprising: optical fiber 3, optical fiber 5, optical fiber 7, optical fiber 9, 4 optical receivers, including: an optical receiver 10, an optical receiver 11, an optical receiver 12, and an optical receiver 13; and a power divider 14.
The connection relationship of the above-mentioned devices is shown in figure 1,
1) the high-isolation single-pole multi-throw microwave switch 1 is connected with the optical transmitters 2, 4, 6 and 8 by high-frequency feed cables.
2) The optical transmitter 2 is connected with the optical fiber 3, and the optical fiber 3 is connected with the optical receiver 13;
3) the optical transmitter 4 is connected with the optical fiber 5, and the optical fiber 5 is connected with the optical receiver 12;
4) the optical transmitter 6 is connected with the optical fiber 7, and the optical fiber 7 is connected with the optical receiver 11;
5) the optical transmitter 8 is connected with an optical fiber 9, and the optical fiber 9 is connected with an optical receiver 10;
6) the optical receivers 10 to 13 are connected to a power divider 14, respectively.
In one implementation of the embodiment of the present invention, as shown in fig. 1, four optical fiber paths are included in the radio height simulation apparatus, wherein the length of the first optical fiber in the first path is H1 m, the length of the second optical fiber in the second path is H2 m, the length of the third optical fiber in the third path is H3 m, and the length of the fourth optical fiber in the fourth path is H4 m, wherein H1> H2> H3> H4,
wherein, the first optical fiber (such as the optical fiber 3) is used for simulating the height of the height gauge above H1 m, the second optical fiber (such as the optical fiber 5) is used for simulating the height of the height gauge from H2 to H1 m, the third optical fiber (such as the optical fiber 7) is used for simulating the height of the height gauge from H3 to H2 m, and the fourth optical fiber (such as the optical fiber 9) is used for simulating the height of the height gauge below H4 to H3 m.
The radio altitude simulation device provided by the embodiment of the invention adopts the echo signal simulation technology of the radio altimeter system, is used for the ground semi-physical simulation test of the aircraft, can simulate the echo signal of the radio altimeter more truly, and ensures that the semi-physical simulation test is completed smoothly. The error of the radio simulation height is reduced by a mode of simulating part or all of the height of the altimeter by the optical fiber, so that the device which has high real-time fidelity, stability and reliability and can strictly simulate the radio echo signal according to the semi-physical simulation condition and the method for realizing the simulation are provided.
Based on the radio altitude simulation apparatus provided in the embodiments of the present invention, an embodiment of the present invention further provides a radio altitude simulation method, which is executed by using the radio altitude simulation apparatus provided in the above embodiments of the present invention, and the radio altitude simulation method may include the following steps:
step 2, sending the optical signal to an optical receiver through an optical fiber, wherein the optical fiber is used for simulating part or all of the height of the altimeter;
step 3, converting the optical signal received after the optical fiber transmission into an electric signal, and carrying out amplification, shaping and other processing on the electric signal to generate a frequency modulation continuous wave signal for simulating the sending of the altimeter;
and 4, performing power division processing on the frequency modulation continuous wave signal to generate an echo signal.
In an implementation manner of the embodiment of the present invention, when the optical fiber is used to simulate a part of the height of the altimeter, the height simulation method further includes:
and simulating the height of the other part of the altimeter by adopting a frequency offset mode.
The following describes an embodiment of the present invention in detail by using specific embodiments, fig. 1 in the above embodiment of the present invention is actually a structure diagram of an optical fiber delay, fig. 2 is a height test curve obtained without using a radio height simulation apparatus provided in the embodiment of the present invention, fig. 3 is a height test curve obtained using a radio height simulation apparatus provided in the embodiment of the present invention, and fig. 3 illustrates a response curve of a simulator.
The embodiment of the invention is based on the characteristic that the radio echo signal is frequency modulation continuous wave, and the difference caused by the self error of the altimeter can be reduced through optical fiber delay. The reason is that the frequency deviation of the FM continuous wave radio altimeter is f0The altimeter is used for generating frequency-modulated continuous waves, the altimeter on the aircraft generates frequency-modulated continuous wave signals and transmits the frequency-modulated continuous wave signals, and the equipment simulates echo signals aiming at the frequency-modulated continuous wave signals, namely the frequency-modulated continuous wave signals according to the height measurement principle of the closed-loop radio altimeter, wherein H is c multiplied by tau/2, and tau is KTm(K＝f0/fbConstant) where c is the speed of light and τ is the delay time, since the wave is reciprocal i.e. τ/2, f0Is a frequency offset; f. ofbIs a beat signal for a constant f0In other words, fbI.e. is a constant fb1＝25KHz；fb＝fb1+fb2(fb2Is an error signal, fbThe slope of (A) is △ f/K), fbIs the actual beat signal; f. ofb1Is a theoretical beat signal. So that f is the sameb2The error value corresponding to a height of 1000 meters is 1000 compared to the error value corresponding to a height of 1 meter. Therefore, by adopting the method of frequency offset plus optical fiber delay, part of the self error of the altimeter can be consumed by the optical fiber.
The radio height simulation device shown in fig. 2 is composed of functional modules such as a high-isolation single-pole multi-throw microwave switch 1, optical transmitters 2, 4, 6 and 8, optical fibers 3, 5, 7 and 9, optical receivers 10 to 13, a power divider 14 and the like. The real-time performance and the stable performance of the optical fiber echo simulator are mainly considered during hardware design; the requirements of the radio altimeter on the aspects of the actual working process, the semi-physical simulation test requirement and the like are met during software design, and the specific scheme is as follows:
a) high isolation type single-pole multi-throw microwave switch 1
The high-isolation single-pole multi-throw microwave switch 1 has the characteristics of gating, super bandwidth, high speed and the like, and is an important component unit in an optical fiber delay system. The response time of the microwave switch is less than 5 microseconds (mu s), and the microwave switch gates a path according to a control signal. The frequency modulated continuous wave signal is then sent to an optical transmitter.
b) Optical transmitters 2, 4, 6, 8
The optical transmitters 2, 4, 6 and 8 convert the received frequency modulated continuous wave signals into optical signals after the received frequency modulated continuous wave signals are subjected to filtering, frequency modulation, phase locking, amplification and other links, and then the optical signals are sent to the optical receivers 10-13 through the optical fibers 3, 5, 7 and 9.
c) Optical receiver 10-13
The optical receivers 10 to 13 are used for converting weak optical signals after transmission into electric signals, amplifying, shaping and the like the signals, and regenerating original input signals. Its main device is a photoelectric detector which converts optical signals into electric signals by using photoelectric effect. The optical receiver feeds the generated fm continuous wave signal to the power divider 14.
d) The power divider 14 processes the received electrical signal into an echo signal for the altimeter
The power divider is a key device in a communication system and an information processing system and is an important constituent unit for forming an optical fiber delay system. The microwave network is a multi-port microwave network which divides the power of input signals into equal or unequal paths of power output and plays a role in distributing or synthesizing signals in the system.
Referring to the test curves shown in fig. 2 and 3, the X axis is actual, the Y axis is height, Hr is a simulation structure, and Hr _ cmd is a theoretical structure, and Hr _ cmd in fig. 2 have large errors.
The radio altitude simulation device and the radio altitude simulation method provided by the embodiment of the invention have good universality, and because a plurality of optical fiber channels can be arranged, simulation of multi-model radio altitude echo signals can be realized in an aircraft ground test; in addition, the simulation of the echo signal of the frequency modulation continuous wave is more vivid and credible through the optical fiber simulation height; furthermore, the embodiment of the invention adopts the mode of reducing the radio echo signal error by the optical fiber, can comprehensively check various dynamic/static indexes of the frequency modulation continuous wave radio altimeter in various limit states by gating the optical fibers with different lengths according to different heights in a limited indoor space, thereby obtaining more test data, providing theoretical support for further improving the height measurement performance of the radio altimeter, more comprehensively checking the overall performance index of the product and providing technical support for the final external field test.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A radio altitude simulation apparatus, comprising: the optical fiber power divider comprises an optical transmitter, an optical receiver, an optical fiber connected between the optical transmitter and the optical receiver, and a power divider connected with the optical receiver;
the optical transmitter is configured to receive the frequency modulated continuous wave signal sent by the altimeter, perform filtering, frequency modulation, phase locking, amplification and other links on the received frequency modulated continuous wave signal, convert the frequency modulated continuous wave signal into an optical signal, and send the optical signal to the optical receiver through an optical fiber;
the optical receiver is configured to convert an optical signal transmitted through an optical fiber into an electrical signal, amplify and shape the electrical signal, generate a frequency modulation continuous wave signal for simulating the sending of the altimeter, and send the frequency modulation continuous wave signal to the power divider;
the power divider is configured to perform power division processing on the input frequency-modulated continuous wave signal to generate an echo signal.
2. Radio altitude simulation apparatus according to claim 1,
the length of the optical fiber is part or all of the height gauge.
3. The radio altitude simulation apparatus according to claim 1, wherein the power divider performs power division processing on the input frequency-modulated continuous wave signal, and comprises:
the power divider is configured to divide the power of the input frequency-modulated continuous wave signal into equal or unequal power, and then generate and output an echo signal.
4. The radio height simulation device according to any one of claims 1 to 3, wherein the number of the optical transmitters, the optical receivers and the optical fibers is equal and the optical transmitters, the optical receivers and the optical fibers are arranged in a one-to-one correspondence manner, and the radio height simulation device further comprises: the single-pole multi-throw microwave switch is respectively connected with the input end of each optical transmitter;
the single-pole multi-throw microwave switch is configured to selectively conduct the multipath optical transmitter through switch control.
5. The radio height simulation device according to claim 4, comprising four optical fiber paths therein, wherein the length of the first optical fiber in the first path is H1 m, the length of the second optical fiber in the second path is H2 m, the length of the third optical fiber in the third path is H3 m, and the length of the fourth optical fiber in the fourth path is H4 m, wherein H1> H2> H3> H4.
6. The radio altitude simulation apparatus of claim 5, wherein the first optical fiber is used to simulate an altimeter at an altitude above H1 m, the second optical fiber is used to simulate an altimeter at an altitude from H2 to H1 m, the third optical fiber is used to simulate an altimeter at an altitude from H3 to H2 m, and the fourth optical fiber is used to simulate an altimeter at an altitude below H4 to H3 m.
7. A radio altitude simulation method, wherein the altitude simulation method is performed using the radio altitude simulation apparatus according to any one of claims 1 to 6, comprising:
receiving a frequency modulation continuous wave signal sent by an altimeter, and converting the frequency modulation continuous wave signal into an optical signal after performing link processing such as filtering, frequency modulation, phase locking, amplification and the like on the received frequency modulation continuous wave signal;
transmitting an optical signal to an optical receiver through an optical fiber, wherein the optical fiber is used for simulating part or all of the height of the altimeter;
converting an optical signal received after optical fiber transmission into an electric signal, and performing amplification, shaping and other processing on the electric signal to generate a frequency modulation continuous wave signal for simulating the altimeter;
and performing power division processing on the frequency modulation continuous wave signal to generate an echo signal.
8. The radio altitude simulation method according to claim 7, wherein when the optical fiber is used to simulate a partial altitude of an altimeter, the altitude simulation method further comprises:
and simulating the height of the other part of the altimeter by adopting a frequency offset mode.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103438901A (en) * | 2013-08-06 | 2013-12-11 | 江西洪都航空工业集团有限责任公司 | Radio echo signal simulation system adopting optical fiber to reduce error |
| CN104730502A (en) * | 2015-03-10 | 2015-06-24 | 中国人民解放军海军航空工程学院 | Arbitrary height analog device of pulse-system radio altimeter |
| CN107894718A (en) * | 2017-11-08 | 2018-04-10 | 江西洪都航空工业集团有限责任公司 | A kind of radio signal processing system and method based on phaselocked loop |
| CN110045341A (en) * | 2019-02-28 | 2019-07-23 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Radar altimeter low interception performance test method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438901A (en) * | 2013-08-06 | 2013-12-11 | 江西洪都航空工业集团有限责任公司 | Radio echo signal simulation system adopting optical fiber to reduce error |
| CN104730502A (en) * | 2015-03-10 | 2015-06-24 | 中国人民解放军海军航空工程学院 | Arbitrary height analog device of pulse-system radio altimeter |
| CN107894718A (en) * | 2017-11-08 | 2018-04-10 | 江西洪都航空工业集团有限责任公司 | A kind of radio signal processing system and method based on phaselocked loop |
| CN110045341A (en) * | 2019-02-28 | 2019-07-23 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Radar altimeter low interception performance test method |
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Application publication date: 20200228 |