CN211955811U - Radar target simulator - Google Patents
Radar target simulator Download PDFInfo
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- CN211955811U CN211955811U CN202020318251.5U CN202020318251U CN211955811U CN 211955811 U CN211955811 U CN 211955811U CN 202020318251 U CN202020318251 U CN 202020318251U CN 211955811 U CN211955811 U CN 211955811U
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Abstract
The utility model relates to a radar target simulator, which comprises an antenna, a circulator, a first mixer, an amplifier and a second mixer; the circulator comprises a first port, a second port and a third port; the first port is connected with an antenna; the second port is connected with the first signal input end of the first mixer; the signal output end of the first mixer is connected with the signal input end of the amplifier; the signal output end of the amplifier is connected with the first signal input end of the second mixer; the signal output end of the second mixer is connected with the third port of the circulator; the second signal input end of the first mixer is also connected with the first local oscillation source; and the second signal input end of the second mixer is also connected with a second local vibration source. The utility model discloses an increase the circulator, adopt an antenna, eliminated angle error and amplitude error between return signal and the transmitted signal, and then eliminated because the measuring accuracy's that this angle error brought influence.
Description
Technical Field
The utility model relates to a radar technical field especially relates to a radar target simulator.
Background
The radar is an electronic device for detecting a target by using electromagnetic waves, and the radar emits the electromagnetic waves to irradiate the target and receives the echoes of the electromagnetic waves, so that information such as the distance from the target to an electromagnetic wave emission point, the distance change rate, the azimuth, the altitude and the like is obtained.
The performance test of radar products is mostly an external field test, the cost is high, the efficiency is low, and the influence of natural environment is large. Radar target simulators are devices used to generate simulated target echo signals, and are of widespread use in the detection and tracking of radar performance and indicators due to their economy, flexibility and repeatability.
In the radar target simulator in the prior art, a receiving antenna and a transmitting antenna are two horn antennas, one receiving antenna and one transmitting antenna are not overlapped, so that an included angle exists between a received signal obtained by the radar target simulator and a transmitted echo signal, and simultaneously, because the antennas of a radar to be detected have different amplitudes in different directions, amplitude difference exists during echo signal amplitude calculation. With the development of the technology, the bandwidth of the radar product is wider and wider, the resolution of the radar is higher and higher, and the influence of the existence of the included angle and the amplitude difference on the measurement result, such as the angle, the distance, the speed, the RCS and other parameters, is gradually displayed.
For those skilled in the art, it is a technical problem to be solved by those skilled in the art to eliminate the measurement error caused by the angle between the receiving antenna and the transmitting antenna.
SUMMERY OF THE UTILITY MODEL
The utility model provides a radar target simulator to reduce radar target simulator complexity and cost, eliminate the measuring error that receiving antenna and transmitting antenna contained angle brought.
The utility model discloses a radar target simulator, include: an antenna, a circulator, a first mixer, an amplifier and a second mixer; the antenna receives a test signal sent by a tested radar and sends the test signal to the circulator; the circulator comprises a first port, a second port and a third port; the first port is connected with the antenna; the second port is connected with a first signal input end of the first mixer; the signal output end of the first mixer is connected with the signal input end of the amplifier; the signal output end of the amplifier is connected with the first signal input end of the second mixer; the signal output end of the second mixer is connected with the third port of the circulator; the second signal input end of the first mixer is also connected with a first local oscillation source; and the second signal input end of the second frequency mixer is also connected with a second local vibration source.
Further, in the above radar target simulator, an optical fiber is connected between the second mixer and the amplifier.
Further, in the radar target simulator, the antenna is a horn antenna.
Further, in the radar target simulator, the first mixer is a down-conversion frequency converter.
Further, in the above radar target simulator, the second mixer is an up-conversion frequency converter.
The utility model discloses in have following technological effect:
firstly, two antennas in the radar target simulator in the prior art are reduced to one by adding the circulator, so that the angle error and the amplitude difference between a return signal and a sending signal are eliminated, and the influence of the measurement precision caused by the angle error is further eliminated.
Second, by placing an optical fiber between the mixer and the amplifier, signal loss can be reduced.
Third, the utility model discloses for radar target simulator among the prior art, can simulate longer distance.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a radar simulator according to an embodiment of the present invention.
Wherein:
1 antenna
2-ring device
3 first mixer
31 first signal input of a first mixer
32 signal output terminal of the first mixer
33 second signal input of the first mixer
4 second mixer
41 first signal input of the second mixer
42 signal output of the second mixer
43 second signal input of the second mixer
5 Amplifier
6 optical fiber
7 first local vibration source
8 second local vibration source
A first port
B second port
C third port
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a radar simulator according to an embodiment of the present invention.
The radar target simulator of the present embodiment includes an antenna 1, a circulator 2, a first mixer 3, an amplifier 5, an optical fiber 6, and a second mixer 4.
The antenna 1 receives a test signal sent by a radar to be tested and sends the test signal to the circulator 2. The circulator 2 comprises a first port a, a second port B and a third port C. The first port A is connected with the antenna 1; the second port B is connected to the first signal input 31 of the first mixer. The signal output 32 of the first mixer is connected to the signal input of the amplifier 5. The signal output of the amplifier 5 is connected to the second mixer first signal input 41 via an optical fiber 6. The signal output 42 of the second mixer is connected to the third port C of the circulator 2.
The second signal input end 33 of the first mixer is also connected with the first local oscillation source 7; the second signal input 43 of the second mixer is also connected to a second local oscillator 8.
In the present embodiment, the antenna 1 is a horn antenna. The first mixer 3 is a down-converter and the second mixer 4 is an up-converter.
The signal sent by the radar of the tested piece reaches the antenna 1, the antenna 1 receives the high-frequency RF signal, the RF signal is a high-frequency signal, the frequency is generally in high frequency bands such as 24 GHz-25.25 GHz, 59 GHz-63 GHz, 76 GHz-77 GHz and 77 GHz-81 Gz, and therefore, the line loss is large.
A high-frequency RF signal enters from a first port A of the circulator 2 and is output from a second port B of the circulator 2; the first local oscillator 7 will generate a local oscillator signal LO, the RF high frequency signal enters the first signal input terminal 31 of the first mixer, and the local oscillator signal L0 enters the second signal input terminal 33 of the first mixer, so as to generate an IF low frequency signal; the IF low frequency signal passes through an optical-to-electrical converter (not shown) to convert the electrical signal into an optical signal, and then enters the input end of the amplifier 5 after being simulated for different distances by the optical fiber 6. The amplifier 5 is provided because the loss generated by the signal received by the antenna 1 through the line, the first mixer and the optical fiber distance simulation is compensated by the amplifier 5, and the corresponding matching is performed according to different RCS values.
The signal with the energy supplement comes out from the output of the amplifier 5 and enters the first signal input 41 of the second mixer 4 again for up-conversion. The second local oscillator 8 also generates a local oscillator LO, enters the second signal input 43 of the second mixer 4, converts the low frequency signal IF back to the high frequency signal RF, and transmits the signal from the signal output 42 of the second mixer to the antenna 1 and exits from the antenna 1 to generate an echo.
Can see through the analysis of above-mentioned working process the utility model discloses in:
1) by adding the circulator, two antennas in the radar target simulator in the prior art are reduced to one antenna, so that the angle error and the amplitude error between the return signal and the sending signal are eliminated, and the influence of the measurement precision caused by the angle and the amplitude error is further eliminated.
2) By placing an optical fiber between the mixer and the amplifier, signal loss can be reduced.
The loss of the optical fiber is much smaller for the radio frequency cable and the optical fiber at the same distance. At simulated short distances (e.g., 1 meter), both radio frequency cables and optical fibers can meet the requirements; however, when the analog long distance (for example, 50 meters) is provided, and the intermediate frequency signal after down conversion is 6GHz, the loss of the radio frequency cable with 50 meters is about 50dB, and the loss of the optical fiber with 50 meters is only about 5 dB. And too much personnel consumption can cause the radar simulator to be ineffective.
3) The utility model discloses for radar target simulator among the prior art, can simulate longer distance.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (5)
1. A radar target simulator, comprising:
an antenna, a circulator, a first mixer, an amplifier and a second mixer;
the antenna receives a test signal sent by a tested radar and sends the test signal to the circulator;
the circulator comprises a first port, a second port and a third port; the first port is connected with the antenna; the second port is connected with a first signal input end of the first mixer;
the signal output end of the first mixer is connected with the signal input end of the amplifier;
the signal output end of the amplifier is connected with the first signal input end of the second mixer;
the signal output end of the second mixer is connected with the third port of the circulator; and is
The second signal input end of the first frequency mixer is also connected with a first local vibration source;
and the second signal input end of the second frequency mixer is also connected with a second local vibration source.
2. The radar target simulator of claim 1,
and an optical fiber is connected between the second mixer and the amplifier.
3. The radar target simulator of claim 2,
the antenna is a horn antenna.
4. The radar target simulator of claim 3,
the first mixer is a down-conversion mixer.
5. The radar target simulator of claim 4,
the second mixer is an up-conversion mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020318251.5U CN211955811U (en) | 2020-03-13 | 2020-03-13 | Radar target simulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020318251.5U CN211955811U (en) | 2020-03-13 | 2020-03-13 | Radar target simulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211955811U true CN211955811U (en) | 2020-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020318251.5U Active CN211955811U (en) | 2020-03-13 | 2020-03-13 | Radar target simulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211955811U (en) |
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2020
- 2020-03-13 CN CN202020318251.5U patent/CN211955811U/en active Active
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