CN2559108Y - Small wideband receiving antenna array for long-range shore-based HF surface-wave radar - Google Patents
Small wideband receiving antenna array for long-range shore-based HF surface-wave radar Download PDFInfo
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- CN2559108Y CN2559108Y CN 02278252 CN02278252U CN2559108Y CN 2559108 Y CN2559108 Y CN 2559108Y CN 02278252 CN02278252 CN 02278252 CN 02278252 U CN02278252 U CN 02278252U CN 2559108 Y CN2559108 Y CN 2559108Y
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Abstract
The utility model relates to a miniature broad band receiving antenna array of a remote shore-based high-frequency surface wave radar. The antenna array comprises the antenna, the antenna array is composed of a plurality of groups of twin antennas, the front row antenna of each group of twin antennas is composed of a short monopole antenna and a broad band matching network, and the rear row is composed of the other short monopole antenna and a broad band matching network; after phase shift through a cable and phase subtraction through a magic T, signals received by the two short monopole antennas forming the twin antenna are respectively connected with corresponding receivers through a T/R Switch. The utility model has the advantages of wide frequency band, simple structure, small floor space, low cost, convenient erection and removability, etc., thereby being suitable for an antenna array system of a sea long-distance detection broad band high-frequency surface wave radar.
Description
Technical field
The utility model relates to a kind of long-range bank base high frequency surface wave radar small sized wide-band receiving antenna array.
Background technology
Be used to survey the high frequency surface wave radar of extra large attitude and sea low speed moving target at present,, improve detection accuracy and increase detection range, often adopt large-scale phased array antenna in order to realize the wave beam azimuth scan.Because this radar operating frequency is low, long hundreds of rice even a few km of generally reaching of antenna array.Build by the sea as the high frequency surface radar HF-SWR (IEEE J.O.E, Vol.19, No.4,540,1994) of Canada development on 1,500 meter the strip, reception antenna is 40 yuan of oscillators, and battle array is long 880 meters.This antenna cost height, floor space are big, are difficult to find the suitable area that can build this radar station by the sea, thereby have limited the extensive use of this radar.How simplifying high frequency surface wave radar antenna array structure, dwindling antenna size is the problem that people are concerned about always.United States Patent (USP) U.S.Pat.No.4172255,5361072 use radar (CODAR) for coastal ocean dynamics has proposed a kind of orthogonal loop/monopole antenna, this three-element aerial compact conformation, with low cost, set up conveniently, but, only be suitable for the coastal waters and survey because the radar operating frequency is too high and antenna gain is too low.The high frequency surface radar of China's development (Wuhan University's journal (version of science), the East Sea experiment of high-frequency ground wave radar, Vol.47, No.1,2001:111～124) antenna array is long 120 meters, although adopted the transmit-receive sharing technology,, can not realize anti-interference and long-range detection because frequency band is too narrow and frequency of utilization is higher.
The utility model content
Problem to be solved in the utility model provide a kind of bandwidth, simple in structure, floor space is little, be applicable to the long-range bank base high frequency surface wave radar small sized wide-band receiving antenna array of sea long-range detection.
The technical scheme that the utility model provides is: a kind of long-range bank base high frequency surface wave radar small sized wide-band receiving antenna array, comprise antenna, described antenna array is made up of some groups of double antennas, the front-seat antenna of each group double antenna is made of a short monopole antenna and broadband matching network, and back row is made of another short monopole antenna and broadband matching network; After the signal that two short monopole antennas of composition double antenna receive subtracts each other by cable phase shift, magic T, continuous with corresponding receiver respectively through transmit-receive switch.
The straight line phase array that above-mentioned antenna array is made up of some groups of double antennas.
Above-mentioned broadband matching network is connected with a reactance after by reactance, resistance and electric capacity parallel connection again, afterwards with another reactance with electric capacity is in parallel obtains; The input of broadband matching network is connected with the feedback point of antenna, and output connects the input of magic T.
In the technical solution of the utility model, the difference that connects cable length that double antenna connects is preferably the subduplicate ratio of relative dielectric constant of filled media in forward and backward row's antenna distance and the cable.
The utility model is realized the back to counteracting owing to adopt above-mentioned forward and backward row's double-antenna structure in broadband, forward direction is similar to addition, makes two antennas form the cardioid pattern of big front and back ratio at the H face.
Long-range bank base high frequency surface wave radar small sized wide-band receiving antenna array of the present utility model, realize azimuth scan by digital beam formation technology, compare with the orthogonal loop/monopole antenna of compactness, improved the gain of antenna, thereby increased the distance of radar detection sea stormy waves; The azimuth information of utilizing multiple signal classification algorithm to extract ocean surface stream and sea low speed moving target has improved angular resolution.Compare with traditional narrow beam, saved antenna farm cost of erection, antenna installation expense and maintenance expense, reduced occupation of land face widely.
Long-range bank base high frequency surface wave radar small sized wide-band receiving antenna array of the present utility model, because element antenna has loaded broadband matching network, antenna changes mild in whole frequency band input impedance, standing-wave ratio is all less than 3.
Long-range bank base high frequency surface wave radar small sized wide-band receiving antenna array of the present utility model, because element antenna is to have used the broadband technology, be characterized at different external disturbance, can make radar carry out frequency conversion work easily, improved the antijamming capability and the operating efficiency of radar.
Long-range bank base high frequency surface wave radar small sized wide-band receiving antenna array of the present utility model because the frequency of using is positioned at the low side of high band, is compared with medium range radar, and its detection range increases greatly.
The utlity model has bandwidth, simple in structure, floor space is little, cost is low, conveniently set up and advantages such as high movable, is applicable to the antenna array system of the wideband high-frequency surface wave radar of sea long-range detection.
Description of drawings
Fig. 1 is unit double-antenna structure figure of the present utility model;
Fig. 2 is that the broadband matching network of double antenna shown in Figure 1 shows structural representation;
Fig. 3 is the standing-wave ratio of element antenna shown in Figure 1;
Fig. 4 is the directional diagram of double antenna shown in Figure 1;
Fig. 5 is that the utility model receiving antenna array is formed the block diagram that is connected with receiving processing system;
Fig. 6 is the directional diagram of receiving antenna array in the block diagram shown in Figure 5.
Embodiment
Referring to Fig. 1～Fig. 6, the utility model comprises short antenna 1,2, broadband matching network 5, cable phase shift 3, magic T4 and earth mat composition, antenna array is wherein formed the straight line phase array by six groups of double antennas 1,2, battle array is failed to grow up in a radar wavelength (λ), and the front-seat antenna 1 of each group double antenna 1,2 is made of high 7 meters short antenna and broadband matching network 5; Thereafter at a distance of d
12What locate is another short monopole antenna 2 and broadband matching network 5 formations of equal height; Operating frequency range is 4～8MHz.In order to realize the back to counteracting in broadband, forward direction is similar to addition, and 1,2 of double antennas of connection connect cable 3 length differences and are preferably
, the signals reverse phase adduction that magic T4 receives two antennas 1,2 forms one road signal transmitting and receiving switch and delivers to receiver.The elementary cell antenna of choosing double antenna 1,2 should have wide as far as possible bandwidth of operation to be beneficial to coupling; In order effectively to mate with receiver, the elementary cell that constitutes double antenna 1,2 is also wanted loading broad-band matching network 5; Standing-wave ratio behind the loading matching network 5, in whole working band, standing-wave ratio changes mild, and all less than 3 (as shown in Figure 3, mean value is less than 2.5).Choose double antenna 1,2 spacings and should make double antenna 1,2 directional diagram lobe width Φ in the radar working band, equal the radar illumination angle, and make receiving pattern that big as far as possible front and back ratio be arranged.Fig. 4 represents wide band double antenna 1,2 directional diagrams at the H face, and beamwidth is between 120 °～160 ° in the bandwidth of operation of two octaves of 4～8MHz, and front and back are than about 25～36dB.
Above-mentioned broadband matching network 5 by reactance L, resistance R and capacitor C parallel connection after again with a reactance L
1Series connection is afterwards with another reactance L
2And capacitor C
1Parallel connection obtains; L=8.5 μ H wherein, R=150 Ω, C=85.5pF, L
1=9.3 μ H, L
2=12.5 μ H, C
1=60.7pF, impedance transformation ratio 9: 1.The input of broadband matching network 5 is connected with the feedback point of antenna 1,2, and output connects the input of magic T3.
Fig. 5 is described to be that the echo-signal that six double antennas 1,2 receive is delivered to receiver at last through transmit-receive switch, and the receiver output signal utilizes digital beam to form the azimuth information that technology export stormy waves parameter and multiple signal classification algorithm (super-resolution Estimation of Spatial Spectrum) output ocean current and target bearing are extracted ocean surface dynamics key element and sea low speed moving target respectively.
Fig. 6 represents the directional diagram of receiving antenna array, and in the bandwidth of 4～8MHz, wide minor level is low between 20 °～35 ° in the half-power of H face directional diagram for aerial array, and front and back are than between greater than 30dB, and direction coefficient is between 12～15dB.
In order to guarantee the performance of antenna, should lay earth mat under this phased array antenna battle array, have good electrical properties to guarantee antenna.
When adopting radar system shown in Figure 5, be equipped with the transmitting antenna of the about 7dB of gain, use linear frequency modulation to interrupt the emission merit power of continuous wave (FMICW) waveform and 3 kilowatts, under six grades of sea conditions, its distance of surveying ocean current can reach 200 nautical miles, the distance of surveying sea surface wind, wave can reach 120 kms, and the carrier-borne OTHR that Pisces that the ability of detection large marine low speed moving target and Britain Neptune radar Co., Ltd release and Marconi company release is suitable substantially.
Claims (4)
1. long-range bank base high frequency surface wave radar small sized wide-band receiving antenna array, comprise antenna, it is characterized in that: described antenna array is made up of some groups of double antennas, the front-seat antenna of each group double antenna is made of a short monopole antenna and broadband matching network, and back row is made of another short monopole antenna and broadband matching network; After the signal that two short monopole antennas of composition double antenna receive subtracts each other by cable phase shift, magic T, continuous with corresponding receiver respectively through transmit-receive switch.
2. antenna array according to claim 1 is characterized in that: the straight line phase array that described antenna array is made up of some groups of double antennas.
3. antenna array according to claim 1 and 2 is characterized in that: broadband matching network is connected with a reactance after by reactance, resistance and electric capacity parallel connection again, afterwards with another reactance with electric capacity is in parallel obtains; The input of broadband matching network connects with the feedback point of antenna, and output connects the input of magic T.
4. antenna array according to claim 1 and 2 is characterized in that: the difference that connects the cable length of double antenna is the subduplicate ratio of relative dielectric constant of medium in forward and backward row's antenna distance and the cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02278252 CN2559108Y (en) | 2002-07-04 | 2002-07-04 | Small wideband receiving antenna array for long-range shore-based HF surface-wave radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02278252 CN2559108Y (en) | 2002-07-04 | 2002-07-04 | Small wideband receiving antenna array for long-range shore-based HF surface-wave radar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2559108Y true CN2559108Y (en) | 2003-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02278252 Expired - Fee Related CN2559108Y (en) | 2002-07-04 | 2002-07-04 | Small wideband receiving antenna array for long-range shore-based HF surface-wave radar |
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| CN (1) | CN2559108Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100380135C (en) * | 2005-07-26 | 2008-04-09 | 武汉大学 | Anti-interference method for ground wave radar in high frequency based on submatrix of antenna |
| CN102707270A (en) * | 2012-06-18 | 2012-10-03 | 武汉大学 | Automatic estimation method for antenna pattern relative to high-frequency ground wave radar |
| CN112448139A (en) * | 2019-08-30 | 2021-03-05 | Oppo广东移动通信有限公司 | Antenna assembly and electronic equipment |
-
2002
- 2002-07-04 CN CN 02278252 patent/CN2559108Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100380135C (en) * | 2005-07-26 | 2008-04-09 | 武汉大学 | Anti-interference method for ground wave radar in high frequency based on submatrix of antenna |
| CN102707270A (en) * | 2012-06-18 | 2012-10-03 | 武汉大学 | Automatic estimation method for antenna pattern relative to high-frequency ground wave radar |
| CN112448139A (en) * | 2019-08-30 | 2021-03-05 | Oppo广东移动通信有限公司 | Antenna assembly and electronic equipment |
| CN112448139B (en) * | 2019-08-30 | 2023-12-22 | Oppo广东移动通信有限公司 | Antenna assembly and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |