CN210143006U - Anti-interference short-range detector front end in three frequency channels of L type - Google Patents
Anti-interference short-range detector front end in three frequency channels of L type Download PDFInfo
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- CN210143006U CN210143006U CN201921200070.6U CN201921200070U CN210143006U CN 210143006 U CN210143006 U CN 210143006U CN 201921200070 U CN201921200070 U CN 201921200070U CN 210143006 U CN210143006 U CN 210143006U
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Abstract
An anti-interference closely detecting ware front end of three frequency channels of L type includes: the antenna comprises an antenna for receiving and transmitting electromagnetic wave signals, a radio frequency circuit board, an intermediate frequency filtering and amplifying circuit board, a digital signal processing circuit board and a shell for mounting the antenna and the circuit boards, wherein the radio frequency circuit board, the intermediate frequency filtering and amplifying circuit board and the digital signal processing circuit board are sequentially arranged along a signal transmission direction; the radio frequency circuit board comprises a Ka-band radio frequency circuit board, a V-band radio frequency circuit board and a W-band radio frequency circuit board; the housing includes a recess in a surface thereof. The Ka-band antenna, the V-band antenna and the W-band antenna are arranged in the groove in parallel, and the Ka-band antenna, the V-band antenna and the W-band antenna are integrated on one plane which is vertically arranged with the radio frequency circuit boards of all bands, so that the front end of the detector is L-shaped. The utility model provides high ability and the interference killing feature of detector detection discernment, and adopt the L type to improve the integrated level and the reliability of system.
Description
Technical Field
The utility model relates to the field of electronic technology, more specifically relate to an anti-interference closely detector front end of three frequency channels of L type.
Background
The millimeter wave detector becomes one of the main technical means for modern air and ground target detection and obstacle avoidance due to the strong rain and fog interference resistance. However, the millimeter wave detector faces interference of various multi-band interference sources in the using process, which causes the detector to fail or the precision to be affected, so that an anti-interference design needs to be performed for interfering electromagnetic waves to improve the detection and identification capability of the detector. In the conventional interference means, in consideration of integration complexity and cost, electromagnetic waves emitted by a single frequency point interference source are used for interfering the detector, and the interference source is generally an interference machine emitting low-frequency band waves such as C, X.
In addition, the conventional millimeter wave detector considers more product performance and has a larger shape. The antennas are mostly based on-chip antennas, and the beam angle of view is generally less than 60 degrees. And the conventional millimeter wave detector does not have the selective blind-viewing function of the large background target, and when the target and the ground background are overlapped, because the radar scattering sectional area of the ground target is very large (larger than 5m2), and the radar scattering sectional area of the short-distance target is small, false alarm is easily generated on the short-distance target, and the actual detection accuracy is influenced.
At present, two novel anti-interference methods exist in China. One is a 2.4GHz frequency band anti-interference method (CN 201310028067.1): the method utilizes the cyclostationarity of the signal, adopts the self-adaptive frequency shift filtering to suppress the interference signal spectrum, extracts the useful signal and reduces the error rate. The other is a space-frequency joint anti-interference realization method (CN 201310611790.2): the method comprises the steps of adopting an FFT broadband division method to divide a broadband signal into a plurality of narrowband signals, then adopting a sliding window method to realize a plurality of times of FFT conversion in short data, realizing covariance matrix calculation among frequency point signals, then adopting a linear constraint minimum variance criterion to respectively obtain a filtering weight of each narrowband signal, and finally adopting a mode of alternatively splicing two paths of data to obtain 1 path of data. The method has high flexibility.
However, the first method uses a single frequency point, which is low in frequency and is easily interfered by the outside. The second method is complicated in hardware and software processes and high in cost. High-frequency electromagnetic waves are quickly attenuated in air, and the same-intensity interference can be carried out on targets with the same distance and the same size only by using higher transmitting power.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that conventional millimeter wave detector frequency channel is single among the prior art, with high costs, the interference killing feature is poor, realizes the miniaturized design of circuit and integration simultaneously, the utility model provides an anti-interference closely detector front end of three frequency channels of L type.
The Ka wave band is usually used for long-distance large target detection and is easily interfered by a high-power Ka radar. The V-band electromagnetic wave has stronger atmospheric absorption capacity and is a natural invisible band. The W wave band has higher frequency, expensive interference source cost and large manufacturing difficulty, so that a commercial interference source of the W wave band is not seen yet, and the W wave band is selected as a detector and has a certain anti-interference advantage. Ka and W are frequency bands with weak atmospheric absorption (attenuation) and are common frequency bands for detection, and product components are easily purchased. For small target detection, no matter which frequency band, the radar of a single frequency band is easily interfered by an active interference source. Therefore, it is necessary to develop a multi-band transceiver module to achieve a better anti-interference effect.
Based on this, the utility model provides an anti-interference closely detector front end of three frequency channels of L type and mounting method thereof, include: the antenna comprises an antenna for receiving and transmitting electromagnetic wave signals, a radio frequency circuit board, an intermediate frequency filtering and amplifying circuit board, a digital signal processing circuit board and a shell for mounting the antenna and the circuit boards, wherein the radio frequency circuit board, the intermediate frequency filtering and amplifying circuit board and the digital signal processing circuit board are sequentially arranged along a signal transmission direction; the radio frequency circuit board comprises a Ka-band radio frequency circuit board, a V-band radio frequency circuit board and a W-band radio frequency circuit board; the shell comprises a groove arranged on the surface of the shell; the Ka-band antenna, the V-band antenna and the W-band antenna are arranged in the groove in parallel; the Ka-band antenna, the V-band antenna and the W-band antenna are integrated on a plane, and the plane is vertically arranged with the radio frequency circuit boards of all bands, so that the front end of the detector is L-shaped.
The Ka-band antenna, the V-band antenna and the W-band antenna are single slit antennas which emit beams perpendicular to an antenna emitting surface and deflect 15-24 degrees towards the motion direction of the detector.
The Ka-band antenna is 7.5-8.5cm in length.
The length of the V-band antenna is 5.5-6.5 cm.
The length of the W-band antenna is 4.5-5.5 cm.
The planar thickness is less than 1.1 cm.
The Ka-band antenna, the V-band antenna and the W-band antenna are arranged in the grooves from outside to inside on two sides of the surface of the shell.
The number of the grooves is 6.
The housing includes four cavities: the radio frequency cavity comprises a Ka-band radio frequency cavity, a V-band radio frequency cavity, a W-band radio frequency cavity and an intermediate frequency and digital signal processing cavity.
The material outside each cavity is copper or kovar alloy, and the material inside the Ka-band radio frequency cavity, the V-band radio frequency cavity and the W-band radio frequency cavity is wave-absorbing material.
The utility model provides high ability and the interference killing feature of detector detection discernment, and adopt the L type to improve the integrated level and the reliability of system. The utility model discloses a L type structure arranges integrated circuit perpendicular to antenna emission face, is favorable to saving monoblock space behind the antenna, improves the system integration degree. And the welding spot of the L-shaped structure has large connecting contact area, which is beneficial to improving the welding firmness of the antenna feed pin. The utility model discloses a Ka, V and the three wave band of W carry out self-adaptation and survey in coordination, and the information transmission that the detector will detect arrives signal processing unit, and control change over switch switches to one in two other frequency channels, effectively avoids enemy's interference. Further, the utility model discloses can survey 5-7m closely little target, to the blind sight of big target selectivity beyond 10m, carry out the intermediate frequency filtering to the big target signal who is greater than 10m promptly.
Drawings
Fig. 1 is a top view of an L-type three-band transceiver front end.
Fig. 2 is a view of the a section (section along the center of the Ka-band antenna) in fig. 1.
Fig. 3 is a view of the B section (section along the center of the V-band antenna) in fig. 1.
Fig. 4 is a view of the C section (section along the center of the W-band antenna) in fig. 1.
The reference numerals are explained below:
1. an antenna slot;
21. ka wave band feed needle, 22, V wave band feed needle, 23, W wave band feed needle;
31. m2 (the diameter is 2mm) screws for connecting the rear cover plate, 32 m2 screws for fixing a Ka waveband radio frequency plate, 33 m2 screws for fixing a V waveband radio frequency plate, 34 m2 screws for fixing a W waveband radio frequency plate, 35 m2 screws for fixing a middle frequency plate, 36 m2 screws for fixing the front cover plate;
4. a rear cover plate;
51. ka-band glass insulator, 52V-band glass insulator, 53W-band glass insulator;
61. a metal partition plate between the Ka-band radio-frequency plate and the V-band radio-frequency plate, a metal partition plate between the 62V-band radio-frequency plate and the W-band radio-frequency plate, and a metal partition plate between the 63W-band radio-frequency plate and the intermediate-frequency plate;
71. the radio frequency module comprises a metal boss for fixing a Ka-band radio frequency plate, a metal boss for fixing a V-band radio frequency plate, a metal boss for fixing a W-band radio frequency plate, a metal boss for fixing a middle frequency plate, a metal boss for fixing a digital circuit board, a metal boss for fixing a V-band radio frequency plate, a metal boss for fixing a W-band radio frequency plate, a metal boss;
8. a V-band radio frequency board;
91. the double-row pin connecting the Ka-band radio-frequency board and the V-band radio-frequency board, 92, 93, 94, 95 and between the intermediate-frequency board and the V-band radio-frequency board and the signal processing board, and the output interface;
10. a W-band radio frequency board;
11. a Ka band radio frequency board;
12. an intermediate frequency plate;
13. a signal processing board;
14. a front metal cover plate;
15. a housing;
16. a W-band antenna;
17. v-coupling off the antenna;
18. ka-band antenna.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, which should be understood as illustrative and not restrictive.
The utility model provides an anti-interference closely detector front end of three frequency channels of L type, as shown in figure 1 and figure 2, include: the antenna comprises an antenna for receiving and transmitting electromagnetic wave signals, a radio frequency circuit board, an intermediate frequency filtering and amplifying circuit board 12 and a digital signal processing circuit board 13 which are sequentially arranged along a signal transmission direction, and a shell 15 for installing the antenna, the radio frequency circuit board, the intermediate frequency filtering and amplifying circuit board 12 and the digital signal processing circuit board 13.
The antenna comprises a Ka-band antenna 18, a V-band antenna 17 and a W-band antenna 16, the radio frequency circuit board comprises a Ka-band radio frequency circuit board 11, a V-band radio frequency circuit board 8 and a W-band radio frequency circuit board 10, and the surface of the shell 15 is provided with a groove.
The Ka-band antenna 18, the V-band antenna 17 and the W-band antenna 16 are integrated on a plane, and the plane is vertically arranged with the band radio frequency circuit boards, so that the front end of the detector is in an L shape. Since the system is given to the volume (length, width and height) of a single detector assembly (antenna + transceiver circuit board + housing + power supply + laser module), and the system power supply and laser are often high in thickness, the system is not suitable for being installed in a sheet structure. Adopt the L type to arrange integrated circuit perpendicular to antenna emission face, be favorable to saving the monoblock space after the antenna is arranged for placing system's power or laser detector etc. improve the integrated level. In addition, because the feed pin is parallel to the circuit board and is vertically contacted with the antenna, the L-shaped structure is adopted to increase the connection contact area of the welding spot, which is beneficial to improving the welding firmness of the feed pin of the antenna.
The Ka-band radio frequency circuit board 11 comprises a signal source corresponding to the Ka-band, a voltage-controlled oscillator, a power divider, a low-noise amplifier and a mixer. The structures of the V-band radio frequency circuit board 8 and the W-band radio frequency circuit board 10 are the same as the structure of the Ka-band radio frequency circuit board 11.
Detector front end mid band antenna 18, V wave band antenna 17 and W wave band antenna 16 all adopt single slit antenna, and its beam perpendicular to antenna emission that sends is to and detector direction of motion certain angle partially to realize that 120 ~ 140 degrees wide visual angle is surveyed. Preferably, the deflection angle is generally in the range of 15 to 24 degrees, and after deflection, when moving at high speed, the probability of detecting the target object by the millimeter wave increases, and if not, because of the high relative speed, the magnitude of the reflected wave entering the receiving antenna after the millimeter wave reaches the target object is small, and the detection probability is low. Further, the front end of the detector can detect a 5-7m long-distance target (RCS is 0.1), and blind vision is selected for large targets (RCS is greater than 5m2) except for 10m, that is, signals of the large targets greater than 10m are subjected to intermediate frequency filtering.
Ka wave band antenna 18 length is 7.5-8.5cm in the anti-interference short-range detector front end of three frequency channel of L type, V wave band antenna 17 length is 5.5-6.5cm, and W wave band antenna 16 length is 4.5-5.5 cm.
Detector front end, Ka wave band antenna 18, V wave band antenna 17 and W wave band antenna 16 are integrated in a plane, and this plane thickness is less than 1.1 cm.
The Ka-band antenna 18, the V-band antenna 17 and the W-band antenna 16 are arranged in the grooves from outside to inside on two sides of the surface of the shell, and the number of the grooves is 6.
Detector front end can self-adaptation switch between Ka, V and W frequency channel, realizes anti-jamming, when the detector detected the signal that has data type (frequency, range and phase place) that is different from in the conventional target storehouse, and the frequency is close with the detector frequency of working, and digital control unit can give-out order, closes the frequency channel detector of working immediately, opens the detector of another frequency channel. The sequence is Ka, V, W and Ka. Thus, enemy interference can be effectively avoided.
Detector front end adopts K frequency channel 34 + -2 GHz, V frequency channel 59 + -2 GHz, and V frequency channel 93 + -2 GHz realizes anti-interference detection. The utility model discloses a miniaturized design realizes that circuit part volume is (4-5) cm (3-5) cm (2-3) cm based on above-mentioned method.
In this embodiment, the method for installing the front end of the detector of the present invention comprises the following steps:
step S1, a housing structure is fabricated. The detector front end structure includes four cavitys: the radio frequency cavity comprises a Ka-band radio frequency cavity, a V-band radio frequency cavity, a W-band radio frequency cavity and an intermediate frequency and digital signal processing cavity, and is beneficial to reducing interference among circuits. Copper or kovar alloy is used between the cavities to avoid electromagnetic wave interference between the cavities. Wave absorbing materials are adopted in the Ka-band radio frequency cavity, the V-band radio frequency cavity and the W-band radio frequency cavity, electromagnetic waves in the cavities are further absorbed, and signal noise of a radio frequency circuit is reduced.
In step S2, two V-band antennas 17 are mounted in the grooves on the surface of the housing. Silver paste is coated on the two longest groove side walls on the outer side of the shell, the antenna is embedded into the groove, the feed pin 22 is connected with the microstrip line on the surface of the V-band radio frequency board 8 through the silver paste, and the m2 screw 33 is installed. As shown in fig. 3.
Step S3, two W-band antennas 16 are installed in the grooves on the surface of the shell, silver paste is coated on the side walls of the two grooves with medium lengths in the middle of the shell, the antennas are embedded in the grooves, the feed pins 23 are connected with the micro-strip lines on the surface of the W-band radio frequency board 10 through the silver paste, and the m2 screws 34 are installed well. As shown in fig. 4.
Step S4, a metal partition plate 62 is placed on the left side of the cavity of the W-band rf board 10.
In step S5, two Ka-band antennas 18 are mounted in the grooves on the surface of the housing. Silver paste is coated on the side walls of the two shortest grooves, the antenna is embedded in the grooves, and the double-row contact pin 91 between the Ka-band radio-frequency plate 11 and the V-band radio-frequency plate 8 is connected. The Ka-band antenna feed pin 21 is connected with a micro-strip line on the surface of the Ka radio frequency board 11 by silver paste, and the m2 screw 32 is installed. As shown in fig. 2.
And step S6, baking the mixture in an oven at 120 ℃ for 2 hours, and taking out the mixture.
Step S7, placing the metal partition 63 and the intermediate frequency circuit board 12 in the intermediate frequency cavity, connecting the double-row pins 93 between the intermediate frequency circuit board 12 and the W-band rf board 10, and installing the m2 screw 35.
Step S8, the signal processing board 13 is placed, the front cover plate 14 is closed, and the m2 screw 36 is mounted.
Step S9, the rear metal cover plate 4 is closed, and the m2 screw 31 is installed.
In step S10, the digital signal processing board 13 is pulled out through the dip 95.
In this embodiment, the design scheme of the Ka band rf circuit is as follows: the VCO adopts SIV018SP4, and the output power is 5-8 dBm; the active frequency multiplier adopts HMC579, and the insertion loss is-11 to-13 dB; the transmitting branch scheme 2 adopts a CHX2092a quadrupler, and outputs 30-40GHz and 9-12 dBm. Self-developed L51LNA is adopted, the output power of L51 is adopted, the gain is 14-16dB and 11-13dBm, the LNA + LNA is adopted at the receiving end, the M61 mixer is adopted as the mixer, and the loss is-5 to-7 dB.
In this embodiment, the design scheme of the V-band rf circuit is as follows: the VCO adopts RMCV3002 and the output power is 13-15 dBm; then, one path of the signal passes through a power divider and then reaches a power amplifier HMC-ABH241 (the performance is that the highest gain is 24dB, the 1dB power output is 16-18dBm, and the working frequency is 50-66GHz), and the other path of the signal passes through a mixer RMCM3314 and is subjected to harmonic mixing; the receiving end signal enters the mixer after passing through the RMCL6108 LNA. (RMCL6108LNA Performance: BW57-65GHz, NF 2.5dB, Gain 21dB, 1dB output 9-11 dBm.)
In this embodiment, the design scheme of the W-band rf circuit is as follows: the transmitting terminal realizes linear frequency modulation by controlling 11.5-12GHz VCO, and generates W-band signals through an 8-frequency multiplier gXOB0017 with output frequency of 86-106 GHz; the final stage is connected with a power amplifier gAPZ0045, and the maximum output power is 200 mW. The receiving front end is provided with a low noise amplifier gANZ0017, and the noise coefficient NF is 4-6 dB; the mixer employs an IQ mixer (image rejection mixer) gMQR 0011. The output frequency of the scheme is 92-96 GHz.
The intermediate frequency filtering and amplifying circuit comprises a triangular wave generating circuit, a band-pass filtering circuit and a two-stage amplifying circuit. In the embodiment, the circuit is designed by adopting the aluminum designer, and the low frequency and the high frequency of the band pass meeting the filtering requirement are obtained. Triangular wave generation is realized through a standard square wave to triangular wave circuit, an ADA4857-2 operational amplifier is adopted to construct an amplifying circuit, and an LC band-pass filter circuit is realized through designing a combined resistor and a capacitor inductor.
The digital signal processing circuit comprises a power supply circuit and an FFT processing circuit. The digital circuit performs FFT processing on the received time domain signal to become a frequency domain signal. And testing and verifying the target by using a detector, outputting a target signal time domain in the intermediate frequency when the target appears, converting the received intermediate frequency signal into a frequency domain signal by using a digital signal processing unit through FFT (fast Fourier transform), judging that the target exists if the frequency domain signal is greater than a set threshold value, and determining the target distance according to the frequency spectrum.
What has been described above is only the preferred embodiment of the present invention, not for limiting the scope of the present invention, but various changes can be made to the above-mentioned embodiment of the present invention. All the simple and equivalent changes and modifications made according to the claims and the content of the specification of the present invention fall within the scope of the claims of the present invention. The present invention is not described in detail in the conventional technical content.
Claims (10)
1. An anti-interference closely detecting ware front end of three frequency channels of L type includes: the antenna comprises an antenna for receiving and transmitting electromagnetic wave signals, a radio frequency circuit board, an intermediate frequency filtering and amplifying circuit board, a digital signal processing circuit board and a shell for mounting the antenna and the circuit boards, wherein the radio frequency circuit board, the intermediate frequency filtering and amplifying circuit board and the digital signal processing circuit board are sequentially arranged along a signal transmission direction; the radio frequency circuit board comprises a Ka-band radio frequency circuit board, a V-band radio frequency circuit board and a W-band radio frequency circuit board; the shell comprises a groove arranged on the surface of the shell; wherein,
the Ka-band antenna, the V-band antenna and the W-band antenna are arranged in the groove in parallel;
the Ka-band antenna, the V-band antenna and the W-band antenna are integrated on a plane, and the plane is vertically arranged with the radio frequency circuit boards of all bands, so that the front end of the detector is L-shaped.
2. The front end of the L-shaped three-frequency band anti-interference short-distance detector of claim 1, wherein the Ka-band antenna, the V-band antenna and the W-band antenna are single-slit antennas which emit beams perpendicular to an antenna emitting surface and deflect 15-24 degrees towards a detector moving direction.
3. The L-shaped triple-band anti-interference proximity detector front-end of claim 1, wherein the Ka-band antenna length is 7.5-8.5 cm.
4. The L-shaped three-band three-frequency anti-interference proximity detector front-end according to claim 1, wherein said V-band antenna length is 5.5-6.5 cm.
5. The L-shaped three-band interference-free proximity detector front end of claim 1, wherein the W-band antenna length is 4.5-5.5 cm.
6. An L-shaped three-band interference-free proximity detector front end according to claim 1, wherein said planar thickness is less than 1.1 cm.
7. The front end of an L-type three-band three-frequency-band anti-interference short-distance detector according to claim 1, wherein the Ka-band antenna, the V-band antenna and the W-band antenna are installed in the groove from the outside to the inside of the surface of the shell.
8. The L-shaped three-band interference-free proximity detector front end of claim 1, wherein the number of said grooves is 6.
9. The L-shaped three-band interference-free proximity detector front end of claim 1, wherein said housing comprises four cavities: the radio frequency cavity comprises a Ka-band radio frequency cavity, a V-band radio frequency cavity, a W-band radio frequency cavity and an intermediate frequency and digital signal processing cavity.
10. The front end of the L-type three-band anti-interference short-distance detector of claim 9, wherein the material outside each cavity is copper or kovar alloy, and the material inside the Ka-band radio-frequency cavity, the V-band radio-frequency cavity and the W-band radio-frequency cavity is wave-absorbing material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429953A (en) * | 2019-07-26 | 2019-11-08 | 中国科学院上海微***与信息技术研究所 | A kind of three frequency range of L-type anti-interference proximity detection device front end and its installation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429953A (en) * | 2019-07-26 | 2019-11-08 | 中国科学院上海微***与信息技术研究所 | A kind of three frequency range of L-type anti-interference proximity detection device front end and its installation method |
| CN110429953B (en) * | 2019-07-26 | 2024-04-19 | 中国科学院上海微***与信息技术研究所 | L-shaped tri-band anti-interference near-distance detector front end and installation method thereof |
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