CN113691317B - Adjustable optical fiber time delay equipment suitable for radar target simulator - Google Patents
Adjustable optical fiber time delay equipment suitable for radar target simulator Download PDFInfo
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- CN113691317B CN113691317B CN202110961412.1A CN202110961412A CN113691317B CN 113691317 B CN113691317 B CN 113691317B CN 202110961412 A CN202110961412 A CN 202110961412A CN 113691317 B CN113691317 B CN 113691317B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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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
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Abstract
An adjustable optical fiber delay device suitable for a radar target simulator comprises an amplitude limiting low-noise amplifier, a low-noise amplifier and an adjustable optical fiber delay assembly, wherein the amplitude limiting low-noise amplifier receives radar radio-frequency signals and outputs the radar radio-frequency signals to the radio-frequency light emitting assembly, the radio-frequency light emitting assembly carries out electro-optical conversion on the radar radio-frequency signals and transmits the converted signals to the adjustable optical fiber delay assembly, five delay times are arranged in the adjustable optical fiber delay assembly, the delay time of the optical signals is changed and adjusted by switching a delay time link in the adjustable optical fiber delay assembly, the adjustable optical fiber delay assembly carries out delay on the optical signals and transmits the delayed optical signals to a radio-frequency optical receiving assembly, and the radio-frequency optical receiving assembly outputs the signals after the electro-optical conversion to an amplifying attenuation assembly which is used for ensuring that gains of links at different delay times are kept consistent; the invention has wide working temperature range, stable time delay, adjustable time delay, short switching time, high time delay precision, high frequency for transmitting radar radio frequency signals and wider bandwidth.
Description
Technical Field
The invention belongs to the field of radar systems, and particularly relates to adjustable optical fiber delay equipment suitable for a radar target simulator.
Background
Nowadays, the radar technology is rapidly developed, and with the development of the international situation and the demand of a battlefield, the development period of the radar is limited to be shorter and shorter. In the outfield test of the radar system, various uncertain natural factors greatly obstruct the test process of the radar, the application of the radar target simulator greatly accelerates the development progress of the radar system, promotes the rapid growth of the radar field, and greatly saves relevant test resources, namely an important auxiliary tool for maintenance personnel to carry out radar detection at ordinary times and important simulation equipment for training radar operators.
The radar target simulator is used for generating a radio frequency signal related to a radar signal waveform, the core is to perform appropriate time delay on the radio frequency signal transmitted by a radar and then send the radio frequency signal back to the radar for the radar to use, and the radar uses the signal to complete the tests of system target detection, ranging accuracy, angle measurement accuracy and target tracking function. The current time delay method is a surface acoustic wave delay line, which uses surface waves propagating along the surface of an elastic solid to transmit signals, and the length of the delay time depends on the length of a sound transmission medium. The existing radar target simulator has the following defects in proper time delay of radio frequency signals transmitted by a radar: 1) The surface acoustic wave device is greatly influenced by temperature, the working temperature range is limited, and stable long-time delay is difficult to realize: 2) The delay time is fixed and cannot be changed or adjusted; 3) The delay precision is low, generally in us magnitude; 4) The bandwidth of the transmitted radar radio frequency signal is narrow, and is about 1GHz approximately; 5) The electrical isolation performance is relatively low, and the method is not suitable for radar radio frequency signals with large bandwidth and high frequency band.
Disclosure of Invention
In order to overcome the existing defects, the invention aims to provide an adjustable optical fiber delay device which can realize the delay of radar radio frequency signals by moving the delay to an optical domain through electro-optical and photoelectric conversion and can realize the random switching of five delays of 0us, 10us, 30us, 60us and 130us for the signals.
The purpose of the invention is realized by adopting the following technical scheme. The invention provides an adjustable optical fiber delay device suitable for a radar target simulator, which comprises
Limiting the low noise amplifier: the device is used for receiving the radar radio-frequency signal, performing radio-frequency amplification on the radar radio-frequency low-power signal, performing amplitude limiting on the high-power signal and outputting the radar radio-frequency signal to the radio-frequency light-emitting component;
the radio frequency light emission component: the optical fiber delay module is used for performing electro-optical conversion on the radar radio-frequency signal transmitted from the amplitude limiting low-noise amplifier, converting the radar radio-frequency signal into an optical signal loaded with the radio-frequency signal and transmitting the optical signal to the adjustable optical fiber delay module;
adjustable optical fiber delay assembly: the adjustable optical fiber delay component is internally provided with five delay time links of 0us, 10us, 30us, 60us and 130us, and the delay time of the optical signal is changed and adjusted by switching the delay time links in the adjustable optical fiber delay component;
the radio frequency light receiving assembly: the optical fiber delay assembly is used for carrying out photoelectric conversion on an optical signal transmitted from the adjustable optical fiber delay assembly and outputting the signal after the photoelectric conversion to the amplification attenuation assembly;
an amplification and attenuation component: the amplification and attenuation component is used for ensuring that the gains of links are kept consistent in different delay times, and is provided with two output ends, a first output end of the amplification and attenuation component outputs radar radio-frequency signals, and a second output end of the amplification and attenuation component is connected with the dial switch;
a dial switch: and the optical fiber delay module is respectively connected with the amplification attenuation module and the adjustable optical fiber delay module and used for adjusting the link gain of a delay time link in the adjustable optical fiber delay module, realizing the switching of five delay time links of 0us, 10us, 30us, 60us and 130us and ensuring that the gain is constant at different delay times.
Furthermore, a high-precision temperature control circuit is integrated in the radio frequency light emitting assembly and the radio frequency light receiving assembly, the control precision is within 0.1 ℃, and the working temperature can range from minus 55 ℃ to plus 70 ℃.
Furthermore, the adjustable optical fiber delay assembly comprises an optical switch and delay optical fibers with corresponding lengths, and the adjustable optical fiber delay assembly realizes 5 kinds of delayed outputs through the optical switch and the delay optical fibers with corresponding lengths.
Further, the optical switches include two 1 × 2 first optical switches 1 and three 2 × 2 second optical switches 2 and the state switching of each optical switch is controlled by a single chip, and the switching between the 0us, 10us, 30us, 60us, and 130us delay time links is controlled by 2 1 × 2 optical switches and 3 2 × 2 optical switches.
Furthermore, the switching time among the 0us delay time link, the 10us delay time link, the 30us delay time link, the 60us delay time link and the 130us delay time link in the adjustable optical fiber delay assembly is less than 0.1ms, and the delay precision is high.
Furthermore, the delay optical fiber in the adjustable optical fiber delay assembly is a temperature insensitive optical fiber, the delay variation is less than 3ns within the range of minus 55 ℃ to plus 70 ℃, and the requirement of radar test outfield service environment is completely met.
Further, the adjustable optical fiber delay apparatus main body 3 includes a front panel 301, a rear panel 302, two side panels 303, a top panel 304 and a bottom panel 305, the two side panels 303 are respectively provided with a handle 4, and the adjustable optical fiber delay apparatus main body 3 is conveniently carried by the handles 4.
Further, the support legs 5 are installed on the bottom plate 305 and the rear panel 302 of the adjustable optical fiber delay apparatus main body 3, and the support legs 5 are used for facilitating the placement of the adjustable optical fiber delay apparatus main body 3 and also can protect the adjustable optical fiber delay apparatus main body 3.
Further, a radio frequency access port 306, a radio frequency output port 307, an alternating current power supply port 308, a power supply indicator lamp, a delay adjusting knob 309 and a gain adjusting knob 310 are arranged on the front panel 301;
further, both sides of the front panel 301 are further provided with a protection seat 311, and the protection seat 311 is used for protecting the radio frequency access port 306, the radio frequency output port 307 and the alternating current power supply interface 308, so as to avoid the interface collision.
By means of the technical scheme, the invention has the advantages that:
1. wide working temperature range and stable delay time
According to the invention, the radio frequency light emitting assembly and the radio frequency light receiving assembly are internally integrated with high-precision temperature control circuits, the control precision is within 0.1 ℃, the working temperature can cover-55 ℃ to +70 ℃, the delay optical fiber in the equipment is a temperature insensitive optical fiber, the delay variation in the range of-55 ℃ to +70 ℃ is less than 3ns, and the requirements of the radar test external field use environment can be completely met;
2. adjustable time delay and short switching time
The invention realizes the random switching output of 5 delays such as 0us, 10us, 30us, 60us, 130us and the like through an optical switch and a delay optical fiber with corresponding length, and the switching time is less than 0.1ms;
3 the time delay precision is high
The invention ensures the delay precision by controlling the precision of the optical fiber, the cutting and welding precision of the optical fiber can reach 10mm, the corresponding delay precision is 50ps, and compared with the acoustic surface delay line, the delay precision is improved by nearly 2000 times;
4. the frequency of transmitting radar radio frequency signals is high, and the bandwidth is wide.
The modulation mode that adjustable optic fibre time delay equipment adopted is intensity modulation, and inside radio frequency light emission subassembly and light receiving assembly transmission frequency can cover 2GHz ~ 18GHz, can cover present military radar frequency channel demand completely.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic block diagram of an adjustable fiber delay apparatus suitable for use in a radar target simulator in accordance with the present invention;
FIG. 2 is a functional block diagram of the adjustable fiber delay assembly of FIG. 1;
FIG. 3 is a perspective view of an adjustable fiber optic delay device suitable for use in a radar target simulator in accordance with the present invention;
FIG. 4 is a front view of FIG. 3;
fig. 5 is a top view of fig. 3.
[ reference numerals ]
1-a first optical switch, 2-a second optical switch, 3-an adjustable optical fiber time delay equipment main body, 301-a front panel, 302-a rear panel, 303-a side panel, 304-a top panel, 305-a bottom panel, 306-a radio frequency access port, 307-a radio frequency output port, 308-an alternating current power supply port, 309-a time delay adjusting knob, 310-a gain adjusting knob, 311-a protective seat, 4-a handle and 5-a support leg.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to an adjustable optical fiber delay apparatus suitable for a radar target simulator according to the present invention with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1 to 5, an adjustable optical fiber delay device suitable for a radar target simulator includes an amplitude limiting low noise amplifier, a radio frequency light emitting component, an adjustable optical fiber delay component, a radio frequency light receiving component, an amplification attenuation component, and a dial switch, wherein an output end of the amplitude limiting low noise amplifier is connected to an input end of the radio frequency light emitting component, a radar radio frequency signal is input into the amplitude limiting low noise amplifier and then output to the radio frequency light emitting component through the amplitude limiting low noise amplifier, the amplitude limiting low noise amplifier is used for performing radio frequency amplification on a radar radio frequency low power signal, and simultaneously, a high power signal can be limited, the maximum amplitude limiting power is 2W, and damage of the device and a system can be prevented. The output end of the radio frequency light emitting assembly is connected with the input end of the adjustable optical fiber delay assembly, the radio frequency light emitting assembly is used for performing electro-optical conversion on radar radio frequency signals, and the radio frequency light emitting assembly converts the radar radio frequency signals into optical signals loaded with the radio frequency signals. Five delay time links of 0us, 10us, 30us, 60us and 130us are arranged in the adjustable optical fiber delay assembly, the adjustable optical fiber delay assembly delays an optical signal loaded with a radio frequency signal, the delay time of the optical signal loaded with the radio frequency signal can be changed and adjusted by switching the delay time links in the adjustable optical fiber delay assembly, the switching of the delay time links is realized by a dial switch, and a radar radio frequency signal is electro-optically converted into the optical signal loaded with the radio frequency signal in a radio frequency light emitting assembly and then enters the adjustable optical fiber delay assembly and is delayed in the adjustable optical fiber delay assembly.
The output end of the adjustable optical fiber delay component is connected with the input end of the radio frequency light receiving component, the output end of the radio frequency light receiving component is connected with the input end of the amplification attenuation component, the radio frequency light receiving component is used for carrying out photoelectric conversion on an optical signal loaded with a radio frequency signal, the optical signal loaded with the radio frequency signal is converted into a radar radio frequency signal, the radar radio frequency signal after the photoelectric conversion is output to the amplification attenuation component, and the amplification attenuation component is used for ensuring that gains of links at different delay times are kept consistent and solving the problem of different losses caused by delay optical fibers with different lengths; the first output end of the amplification and attenuation component outputs radar radio frequency signals, the second output end of the amplification and attenuation component is connected with the dial switch, the dial switch is also connected with the adjustable optical fiber delay component, the link gain of a delay time link in the adjustable optical fiber delay component can be adjusted through the dial switch, and the gain is ensured to be constant at different delay times.
The radio frequency light emitting component and the radio frequency light receiving component are internally integrated with a high-precision temperature control circuit, the control precision is within 0.1 ℃, and the working temperature can cover minus 55 ℃ to plus 70 ℃.
Referring to fig. 2, the adjustable optical fiber delay assembly includes an optical switch and a delay optical fiber with a corresponding length, the optical switch includes two 1 × 2 first optical switches 1 and three 2 × 2 second optical switches 2, and the state switching of each optical switch is controlled by a single chip, the adjustable optical fiber delay assembly realizes 5 kinds of delay output by selecting the optical switches and the delay optical fiber with a corresponding length, that is, the switching between delay time links of 0us, 10us, 30us, 60us and 130us is controlled by 2 1 × 2 optical switches and 3 2 × 2 optical switches, the switching time is less than 0.1ms, and the delay precision is high. The delay optical fiber in the adjustable optical fiber delay assembly is a temperature insensitive optical fiber, the delay variation is less than 3ns within the range of minus 55 ℃ to plus 70 ℃, the requirement of radar test outfield service environment can be completely met, the delay precision is ensured by controlling the precision of the optical fiber, the cutting and welding precision of the optical fiber can reach 10mm, the corresponding delay precision is 50ps, and compared with a sound wave surface delay line, the delay precision is improved by nearly 2000 times.
The modulation mode that adjustable optic fibre time delay equipment adopted is intensity modulation, and the inside radio frequency light emission subassembly of equipment and light receiving assembly transmission frequency can cover 2GHz ~ 18GHz, and the frequency height, the bandwidth width of transmission radar radio frequency signal can cover present military radar frequency channel demand completely.
Referring to fig. 3 to fig. 5, an adjustable optical fiber delay device suitable for a radar target simulator is a desktop type, and includes an adjustable optical fiber delay device main body 3, where the size (length × width × height) of the adjustable optical fiber delay device main body 3 in this embodiment is: 420 × 300 × 130 mm, in other embodiments of the present invention, the size of the adjustable optical fiber delay apparatus body 3 may be set according to actual situations. The adjustable optical fiber delay device main body 3 comprises a front panel 301, a rear panel 302, two side panels 303, a top panel 304 and a bottom panel 305, wherein the two side panels 303 are respectively provided with a handle 4, and the adjustable optical fiber delay device main body 3 is convenient to carry through the handles 4. The support legs 5 are installed on the bottom plate 305 and the rear panel 302 of the adjustable optical fiber delay device main body 3, and the support legs 5 are used for facilitating the placement of the adjustable optical fiber delay device main body 3 and can also play a role in protecting the adjustable optical fiber delay device main body 3. The front panel 301 is provided with a radio frequency access port 306, a radio frequency output port 307, an alternating current power supply interface 308, a power supply indicator lamp, a delay adjusting knob 309 and a gain adjusting knob 310; the front panel 301 is also provided with protective seats 311 on both sides, and the protective seats 311 are used for protecting the radio frequency access port 306, the radio frequency output port 307 and the alternating current power supply interface 308, so as to avoid the interface collision.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art can make any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the present invention without departing from the scope of the present invention, and still fall within the scope of the present invention.
Claims (9)
1. An adjustable optical fiber time delay device suitable for a radar target simulator is characterized in that: comprises that
Limiting the low noise amplifier: the device is used for receiving radar radio frequency signals, performing radio frequency amplification on the radar radio frequency low-power signals, performing amplitude limiting on high-power signals and outputting the radar radio frequency signals to the radio frequency light emitting assembly;
the radio frequency light emission component: the device is used for performing electro-optical conversion on the radar radio-frequency signal transmitted from the amplitude limiting low-noise amplifier, converting the radar radio-frequency signal into an optical signal loaded with the radio-frequency signal and transmitting the optical signal to the adjustable optical fiber delay component;
adjustable optical fiber delay assembly: the adjustable optical fiber delay assembly is used for delaying an optical signal transmitted from the radio frequency light emitting assembly and transmitting the delayed optical signal to the radio frequency light receiving assembly, five delay time links of 0us, 10us, 30us, 60us and 130us are arranged in the adjustable optical fiber delay assembly, and the delay time of the optical signal is changed and adjusted by switching the delay time links;
the radio frequency light receiving assembly: the radio frequency light receiving component converts the optical signal into a radar radio frequency signal and outputs the radar radio frequency signal to the amplification attenuation component;
an amplification attenuation component: the amplification and attenuation component is used for ensuring that the gains of links are kept consistent in different delay times, and is provided with two output ends, a first output end of the amplification and attenuation component outputs radar radio-frequency signals, and a second output end of the amplification and attenuation component is connected with the dial switch;
a dial switch: the optical fiber delay module is respectively connected with the amplification attenuation module and the adjustable optical fiber delay module and used for adjusting the link gain of a delay time link in the adjustable optical fiber delay module, realizing the switching of five delay time links of 0us, 10us, 30us, 60us and 130us and ensuring the gain to be constant at different delay times;
the radio frequency light emitting assembly and the radio frequency light receiving assembly are internally integrated with a high-precision temperature control circuit, the control precision is within 0.1 ℃, and the working temperature can range from-55 ℃ to +70 ℃.
2. The adjustable optical fiber delay device suitable for the radar target simulator of claim 1, wherein: the adjustable optical fiber delay assembly comprises an optical switch and a delay optical fiber with the length corresponding to the delay time, and the adjustable optical fiber delay assembly realizes the output of 5 delay signals through the optical switch and the delay optical fiber with the corresponding length.
3. The adjustable optical fiber delay device suitable for the radar target simulator according to claim 2, wherein: the optical switches comprise two 1 x 2 first optical switches 1 and three 2 x 2 second optical switches 2 and the switching of the states of the respective optical switches is controlled by a single chip, the switching between 0us, 10us, 30us, 60us and 130us delay time links being controlled by 2 1 x 2 optical switches and 3 2 x 2 optical switches.
4. The adjustable optical fiber delay device suitable for the radar target simulator according to claim 3, wherein: the switching time among the 0us delay time link, the 10us delay time link, the 30us delay time link, the 60us delay time link and the 130us delay time link in the adjustable optical fiber delay assembly is less than 0.1ms, and the delay precision is high.
5. The adjustable optical fiber delay device suitable for the radar target simulator according to claim 2, wherein: the delay optical fiber in the adjustable optical fiber delay assembly is a temperature insensitive optical fiber, the delay variation is less than 3ns within the range of minus 55 ℃ to plus 70 ℃, and the requirement of the radar test outfield service environment is completely met.
6. The adjustable optical fiber delay device suitable for the radar target simulator of claim 1, wherein: the adjustable optical fiber delay equipment main body (3) comprises a front panel (301), a rear panel (302), side panels (303), a top plate (304) and a bottom plate (305), a handle (4) is installed on each side panel (303), and the adjustable optical fiber delay equipment main body (3) is convenient to carry through the handle (4).
7. The adjustable optical fiber delay device suitable for the radar target simulator of claim 1, wherein: supporting feet (5) are installed on a bottom plate (305) and a rear panel (302) of the adjustable optical fiber delay equipment main body (3), the supporting feet (5) are used for facilitating placement of the adjustable optical fiber delay equipment main body (3), and meanwhile the adjustable optical fiber delay equipment main body (3) can be protected.
8. The adjustable optical fiber delay device suitable for the radar target simulator of claim 1, wherein: the front panel (301) is provided with a radio frequency access port (306), a radio frequency output port (307), an alternating current power supply interface (308), a power supply indicator lamp, a time delay adjusting knob (309) and a gain adjusting knob (310).
9. The adjustable optical fiber delay device suitable for the radar target simulator of claim 8, wherein: the front panel (301) both sides still are provided with protection seat (311), and protection seat (311) are used for protecting radio frequency access port (306), radio frequency delivery outlet (307) and alternating current power supply interface (308), avoid appearing colliding with the condition of interface.
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| CN202110961412.1A CN113691317B (en) | 2021-08-20 | 2021-08-20 | Adjustable optical fiber time delay equipment suitable for radar target simulator |
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| CN202110961412.1A CN113691317B (en) | 2021-08-20 | 2021-08-20 | Adjustable optical fiber time delay equipment suitable for radar target simulator |
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| CN113691317B true CN113691317B (en) | 2022-12-09 |
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| CN105785334B (en) * | 2016-03-15 | 2019-06-28 | 中国电子科技集团公司第二十七研究所 | A kind of X-band broadband radar target simulator of full coherent |
| CN205427180U (en) * | 2016-03-15 | 2016-08-03 | 中国电子科技集团公司第二十七研究所 | X wave band broadband radar target simulation ware of full coherent |
| CN109905140A (en) * | 2019-03-19 | 2019-06-18 | 中国科学院半导体研究所 | Radiofrequency signal delayed time system |
| CN110868252A (en) * | 2019-12-18 | 2020-03-06 | 中国电子科技集团公司第四十三研究所 | Self-adaptive high-precision optical fiber delay system |
| CN113219443A (en) * | 2021-06-18 | 2021-08-06 | 上海机动车检测认证技术研究中心有限公司 | Laser radar target simulator |
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