CN1924608A - Radar antenna electromagnetic interference suppressor and shielding device - Google Patents

Abstract

This invention relates to one shield device to prevent antenna electron-magnetic interference in capacity field, which comprises base socket and kettle radar antenna feedback source on the socket and is characterized by the following: both sides of kettle radar antenna fringe; metal shield block surface is vertical to the kettle radar antenna radium; metal shield board is fixed on the metal supportive rack on the socket. These invention sets the metal shield block beside the radar antenna to form radar side prevent device.

Description

Radar antenna electromagnetic interference suppressor and shielding device

Technical field

The present invention relates to a kind of radical occlusion device that suppresses the radar antenna electromagnetic interference (EMI), belong to the electromagnetic compatibility field.Because radar is a R-T unit,, also can suppress the interference of the electromagnetic radiation of other radar and electronic equipment simultaneously to radar self so this radical occlusion device both can be used for blocking the interference of the electromagnetic radiations emission of radar antenna secondary lobe to miscellaneous equipment.

Background technology

The radar antenna Anti-Jamming Technique is a popular research topic both domestic and external all the time, many relevant control technologys have appearred, comprise wave filter technology (harmonic supression filter, variable band-pass filter and bandpass filter etc.), the economy input that this Technology Need is bigger; Blanking technology (comprising fan-shaped blanking, pulse blanking device, sidelobe blanking etc.), this Technology Need install necessary blanking circuit or device additional in radar system, and when using blanking, may lose useful signal; Discr. technology (comprising pulse recurrence frequency discriminator and pulse-width discriminator), this technology utilizes lag line and coincidence circuit to eliminate and disturbed radar repetition interval or pulsewidth interference inequality, but the interference that paired pulses cycle or pulsewidth are more or less the same will lose meaning; Also have secondary lobe control technology, impulsive synchronization (or unified triggering) technology and pulse-shaping technique etc. in addition.Though these technology can suppress some electromagnetic interference (EMI), but limitation is arranged respectively, and on technology and funds, all need bigger input, also will know the disturbed condition that the radar present position may be subjected in advance simultaneously, and these are difficult to know in radar development and design process.Therefore, develop novel radar antenna Anti-Jamming Technique and be very important, not only help solving the electromagnetic interference problem between the radar antenna, the function of electronic equipment is not fully exerted, but also can be used for the interference inhibition of other microwave system.

Summary of the invention

Technical matters to be solved by this invention is to provide a kind of simple in structure, usability is flexible and cost of manufacture is low radar antenna electromagnetic interference suppressor and shielding device, and the electromagnetic interference (EMI) between the radar antenna is suppressed.

The present invention addresses the above problem the technical scheme that is proposed to be: comprise pedestal 3 and the pot shape radar antenna 1 and the feed 2 that are installed on the pedestal, it is characterized in that sheet shape metal shutter 4 being set in the symmetria bilateralis at pot shape radar antenna bore edge, the plate face of metal shutter is vertical mutually with the bore face of pot shape radar antenna, and the metal shutter is supported by the nonmetal bracing frame 5 that is installed on the pedestal.

Press such scheme, described metal shutter 4 is designed to laterally zygomorphic dual vane type or biparting type; The central point of metal shutter 4 is apart from the minimum distance R at radar antenna 1 bore edge ₀Be 0.8-1.2m.

Press such scheme, can install sheet shape metal shutter 4 at the downside at pot shape radar antenna bore edge.

According to Huygens---Fresnel principle, in even infinitely great medium, the field can utilize the area of the infinitepiston between radiator and the observation point to divide formula to represent.This infinitepiston between radiation source and the observation point A can be divided into many Fresnel bands, on the appropriate location of some Fresnel zone, place metal shutter 4, electromagnetic wave 6 from radiation source is blocked, just can the electromagnetic field that A behind the metal shutter is ordered be suppressed.But the size of metal shutter is wavelength X and sheet metal position R ₀Function, therefore difform sheet metal is placed on the different positions, the difference on effect that suppresses electromagnetic interference (EMI) is very big.Can design the most effective metal shutter according to Theoretical Calculation and verification experimental verification, and be fixed on the optimum position.

The present invention is arranged on the side direction of radar antenna with the metal shutter, forms radar antenna Sidelobe Suppression device, and its beneficial effect is:

1. can effectively block of the interference of the electromagnetic radiations emission of radar antenna secondary lobe, also can suppress the interference of the electromagnetic radiation of other radar and electronic equipment simultaneously, thereby improve the serviceability of radar radar self to miscellaneous equipment.

2. need not to change the profile and the internal circuit of radar antenna, simple in structure, cost of manufacture is low, and the usability flexibility and reliability also is convenient to install and use.

Description of drawings

Fig. 1 is the side-looking structural drawing of one embodiment of the invention, also is the right view of Fig. 2.

Fig. 2 is the structural drawing of facing of one embodiment of the invention.

Fig. 3 blocks the inhibition principal diagram for electromagnetic wave of the present invention.

Fig. 4 is a dual vane type metal shutter embodiment shape assumption diagram of the present invention.

Fig. 5 is the biparting type metal of a present invention shutter embodiment shape assumption diagram.

Fig. 6 tests directional diagram for dual vane type metal shutter embodiment of the present invention.

Embodiment

Further specify embodiments of the invention below in conjunction with accompanying drawing.

First embodiment is shown in Fig. 1,2,3,4,6, comprise pedestal 3 and the pot shape radar antenna 1 and the feed 2 that are installed on the pedestal, symmetria bilateralis at pot shape radar antenna bore edge is provided with sheet shape metal shutter 4, the plate face of metal shutter is vertical mutually with the bore face of pot shape radar antenna, the central point of metal shutter 4 flushes with the bore edge mid-points of pot shape radar antenna 1, and is R apart from the minimum distance at radar antenna bore edge ₀=1m.The metal shutter is supported by the nonmetal bracing frame 5 that is installed on the pedestal.Metal shutter 4 and bracing frame 5 can rotate with radar 1 along with pedestal 3.Metal shutter 4 shapes are according to Huygens---the Fresnel principle calculation Design, be the dual vane type of two blade symmetries up and down, and Figure 4 shows that the circumference curvilinear figure of dual vane type metal shutter, pole axis ρ is the function of angle .The field intensity that A is ordered utilizes area to divide formulate to be:

$u=u_0\underset{S}{\∫}\frac{e^{-i{\mathrm{\βR}}_1}}{R_1}({\hat{R}}_1\·\hat{z})\mathrm{dS}$

Wherein ${\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="A20061012453800072.png"\; state="\{\{state\}\}">R</figure-callout>}}_1=\sqrt{R_0^2+{\mathrm{\&rho;}}^2}.$ Obviously will make A point radiation field is zero, then has:

The polar coordinates pole axis ρ that satisfies the dual vane type metal shutter circumference of following formula can be expressed as (function that ρ is angle ):

ξ=4R in following formula ₀λ/π, α ₀Be constant.

Get R ₀=1m, λ=6cm, α ₀=ξ/4, the shape and size of twayblade metal shutter as shown in Figure 4 under polar coordinate system.In 0 °～90 ° twayblade metal shutter ρ values such as following table:

	ρ (mm)		ρ (mm)		ρ (mm)		ρ (mm)		ρ (mm)
										0°	19.1	1°	41.2	2°	55.1	3°	66.1	4°	75.5
5°	83.9	6°	91.5	7°	98.5	8°	105	9°	111.2
										10°	117	11°	122.6	12°	127.9	13°	133	14°	138
15°	142.7	16°	147.3	17°	151.8	18°	156.1	19°	160.3
										20°	164.4	21°	168.4	22°	172.3	23°	176.2	24°	179.9
25°	183.6	26°	187.2	27°	190.7	28°	194.2	29°	197.6
										30°	200.9	31°	204.2	32°	207.4	33°	210.6	34°	213.8
35°	216.9	36°	219.9	37°	222.9	38°	225.9	39°	228.8
										40°	231.7	41°	234.6	42°	237.4	43°	240.2	44°	243
45°	245.7	46°	248.4	47°	251.1	48°	253.7	49°	256.3

50°	258.9	51°	261.5	52°	264	53°	266.5	54°	269
										55°	271.5	56°	273.9	57°	276.3	58°	278.7	59°	281.1
60°	283.5	61°	285.8	62°	288.2	63°	290.5	64°	292.7
										65°	295	66°	297.3	67°	299.5	68°	301.7	69°	303.9
70°	306.1	71°	308.3	72°	310.4	73°	312.6	74°	314.7
										75°	316.8	76°	318.9	77°	321	78°	323.1	79°	325.1
80°	327.2	81°	329.2	82°	331.2	83°	333.2	84°	335.2
										85°	337.2	86°	339.2	87°	341.1	88°	343.1	89°	345
90°	346.9

Since twayblade metal shutter be about and laterally zygomorphic, the ρ value that is to say 30 ° equates with 150 °, 210 °, 330 ° ρ value, 65 ° ρ value equates with 115 °, 245 °, 295 ° ρ value, therefore the value of ρ does not repeat them here 90 °～360 ° the time, can be determined 0 °～360 ° ρ value by 0 °～90 ° ρ value.Dual vane type metal shutter is arranged on pot both sides at shape radar antenna bore edge with two blade symmetrical manner up and down.

Occlusion effect to metal shutter shown in Figure 4 is tested, test findings as shown in Figure 6, dotted line is not have the directional diagram receive when blocking, the directional diagram of solid line for receiving after blocking with the twayblade metal baffle.From Fig. 6 as seen, twayblade metal shutter can suppress the interference in the angular range of A point and near broad thereof, the about 10dB of inhibition effect of ordering at A.Test shows that this technology of blocking has engineering practicability, can disturb the secondary lobe between the microwave frequency band radar antenna and effectively suppress.

Second embodiment is the biparting type of being shaped as of metal shutter 4 with the difference of a last embodiment as shown in Figure 5, by 2 1/4 circles formed fan-shaped meet up and down in symmetry be formed by connecting, radius of circle is $\mathrm{\&rho;}=\sqrt{{\mathrm{\&lambda;<figure-callout\; id="0"\; label="R"\; filenames="A20061012453800081.png"\; state="\{\{state\}\}">R</figure-callout>}}_0}.$ Get R ₀=1m, λ=6cm, then radius ρ=245mm.The architectural feature of other parts is identical with a last embodiment.

The present invention also can be according to radar installation environment, frequency of operation and other shape and size of interference characteristic design metal shutter.

Claims (7)

1, a kind of radar antenna electromagnetic interference suppressor and shielding device, comprise pedestal (3) and be installed in pot shape radar antenna (1) and feed (2) on the pedestal, it is characterized in that sheet shape metal shutter (4) being set in the symmetria bilateralis at pot shape radar antenna bore edge, the plate face of metal shutter is vertical mutually with the bore face of pot shape radar antenna, and the metal shutter is supported by the nonmetal bracing frame (5) that is installed on the pedestal.

2, by the described radar antenna electromagnetic interference suppressor and shielding device of claim 1, it is characterized in that described metal shutter (4) is designed to laterally zygomorphic dual vane type or biparting type.

3, by claim 1 or 2 described radar antenna electromagnetic interference suppressor and shielding devices, it is characterized in that the minimum distance R of the central point of metal shutter (4) apart from radar antenna (1) bore edge ₀Be 0.8-1.2m.

4, by claim 1 or 2 described radar antenna electromagnetic interference suppressor and shielding devices, it is characterized in that installing sheet shape metal shutter at the downside at pot shape radar antenna bore edge.

5, by the described radar antenna electromagnetic interference suppressor and shielding device of claim 2, the metal shutter (4) that it is characterized in that described dual vane type or biparting type is arranged on pot both sides at shape radar antenna (1) bore edge with two blade symmetrical manner up and down.

6, by claim 2 or 5 described radar antenna electromagnetic interference suppressor and shielding devices, it is characterized in that the polar coordinates formula of described dual vane type metal shutter circumference is:

ξ=4R in the formula ₀λ/π, a ₀Be constant, get R ₀=1m, λ=6cm, a ₀=ξ/4.

7, by claim 2 or 5 described radar antenna electromagnetic interference suppressor and shielding devices, it is characterized in that described biparting type metal shutter fan-shapedly meets middle symmetry to be formed by connecting up and down by 2 1/4 circles are formed, radius of circle is $\mathrm{\&rho;}=\sqrt{\mathrm{\&lambda;}{R}_0}=245\mathrm{mn}.$

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