CN205027894U - High frequency over --horizon radar analog front end suitable for multifrequency network deployment of many bases - Google Patents
High frequency over --horizon radar analog front end suitable for multifrequency network deployment of many bases Download PDFInfo
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- CN205027894U CN205027894U CN201520800661.2U CN201520800661U CN205027894U CN 205027894 U CN205027894 U CN 205027894U CN 201520800661 U CN201520800661 U CN 201520800661U CN 205027894 U CN205027894 U CN 205027894U
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Abstract
The utility model discloses a high frequency over - -horizon radar analog front end suitable for multifrequency network deployment of many bases, the circuit that connects gradually include front end lightning protection amplitude limiting protection circuit, a transmitter -receiver isolation switch, low -noise amplifier, the 2nd transmitter -receiver isolation switch, power distribution unit, later are divided into the multichannel: every way is constituteed and is all included the preselection filter in proper order, the controllable amplifier that gains, still includes control circuit, control circuit respectively with a transmitter -receiver isolation switch, the 2nd transmitter -receiver isolation switch and every way in the controllable amplifier of gain be connected, the central frequency of the preselection filter in every way is different. The utility model discloses the echo signal of separable each frequency channel of play, the nimble adjustment of the controllable amplifier of each frequency channel gain accessible gain makes the echo signal of each frequency of respectively standing satisfy the required dynamic of back level circuit, makes multistatic radar network deployment work at the optimum, and circuit structure is simple, and the gain can be adjusted to the different frequency is nimble, is applicable to the complicated mode of many bases multifrequency network deployment.
Description
Technical field
The utility model relates to over-the-horizon radar technical field, particularly relates to high frequency over the horizon radar AFE (analog front end), particularly a kind of high frequency over the horizon radar AFE (analog front end) being applicable to the multifrequency networking of many bases.
Background technology
High frequency over the horizon radar is generally operational in two (many) bases pattern now, and each station can be operated in multifrequency pattern, and this radar echo signal causing each station to receive is more complicated.Under different mode of operations, the radar station quantity participating in networking is different, and the dynamic range that radar receives echoed signal changes greatly.The electric wave signal of different frequency is different with the attenuation characteristic of propagation, and the dynamic range of each frequency echo signals is also different.And the AFE (analog front end) of existing high frequency over the horizon radar mostly is the AFE (analog front end) of fixed gain, and the echoed signal gain of each frequency can not separately control, and is difficult to meet networking model complicated like this, and each station radar is not often operated in optimum condition.
Utility model content
For the problems referred to above, the utility model provides a kind of high frequency over the horizon radar AFE (analog front end) being applicable to the multifrequency networking of many bases, the utility model separable go out the echoed signal of each frequency range, each band gain is by the flexible adjustment of gain controlled amplifier, the echoed signal of each frequency in each station is made to meet dynamic range needed for late-class circuit, multistatic radar networking is made to be operated in optimum condition, the utility model circuit structure is simple, gain for different frequency flexible, can be applicable to the complex work pattern of many bases multifrequency networking.
For achieving the above object, the utility model takes following technical scheme:
A kind of high frequency over the horizon radar AFE (analog front end) being applicable to the multifrequency networking of many bases, the circuit connected successively comprises front end lightning limitation protection circuit, the first transceiver insulation switch, low noise amplifier, the second transceiver insulation switch, power divider, be divided into multichannel afterwards: every road composition comprises preselection filter, gain controlled amplifier all successively, also comprise control circuit, described control circuit is connected with the gain controlled amplifier in the first transceiver insulation switch, the second transceiver insulation switch and every road respectively;
Wherein, the centre frequency of the preselection filter in every road is different.
Wherein, described lightning limitation protection circuit comprises the contrary schottky diode of both direction and lightning-proof chip, and amplitude limit intensity is positive and negative 250mV.
Wherein, the break-make of described first transceiver insulation switch and the second transceiver insulation switch is controlled by control circuit, adopts two-stage cascade in circuit, ensures that the isolation of transmitting-receiving is greater than 60dB.
Wherein, the signal received is divided into two-way by described power divider, and the centre frequency of the preselection filter wherein in a road is 8MHz, for being come by the Signal separator of 7.5 ~ 8.5MHz frequency range; The centre frequency of the preselection filter in another road is 12MHz, for being come by the Signal separator of 11.5 ~ 12.5MHz frequency range.
The utility model is owing to taking above technical scheme, and it has the following advantages:
1, the utility model can isolate the radar echo signal of different frequency range with preselection filter, and each frequency range all has gain controlled amplifier, can adjust gain flexibly, makes each band operation in optimum condition;
2, the utility model makes radar work can in many bases networking model by regulating the gain of gain controlled amplifier;
3, the utility model circuit structure is simple, is easy to realize, and meets actual user demand.
Accompanying drawing explanation
Fig. 1 is a kind of circuit structure block diagram being applicable to the high frequency over the horizon radar AFE (analog front end) of many bases multifrequency networking that the utility model embodiment provides.
In figure:
1-lightning limitation protection circuit, 2-1-the first transceiver insulation switch, 3-low noise amplifier, 2-2-the second transceiver insulation switch, 4-power divider, 5-preselection filter, 6-gain controlled amplifier, 7-control circuit.
Embodiment
Below in conjunction with drawings and Examples, technical solutions of the utility model are described in detail as follows.
As shown in Figure 1, a kind of high frequency over the horizon radar AFE (analog front end) being applicable to the multifrequency networking of many bases described in the utility model, the circuit connected successively comprises front end lightning limitation protection circuit 1, first transceiver insulation switch 2-1, low noise amplifier 3, second transceiver insulation switch 2-2, power divider 4, be divided into multichannel afterwards: every road composition comprises preselection filter 5 all successively, gain controlled amplifier 6, also comprise control circuit 7, described control circuit 7 respectively with the first transceiver insulation switch 2-1, gain controlled amplifier 6 in second transceiver insulation switch 2-2 and often road connects,
Wherein, the centre frequency of the preselection filter 5 in every road is different.
In the present embodiment, the signal received is divided into multichannel by described power divider 4, and the Signal separator of different frequency range comes by the preselection filter 5 in every road, then carries out gain control through gain controlled amplifier 6, finally accesses late-class circuit.
Under the networking model of many bases, radar receives the radar echo signal from difference station, and the dynamic range of the signal that each station receives changes greatly, and needs AFE (analog front end) to have gain flexibly; In addition, under each station can be operated in multifrequency pattern, the propagation attenuation characteristics of the signal of different frequency is different, and the dynamic range of the echoed signal of each frequency that radar receives is different.The utility model separable go out the echoed signal of each frequency range, each band gain, by the flexible adjustment of gain controlled amplifier, makes the echoed signal of each frequency in each station meet dynamic range needed for late-class circuit, makes multistatic radar networking be operated in optimum condition.
Front end lightning limitation protection circuit 1 receives the signal from receiving antenna, comprises the contrary schottky diode of both direction and lightning-proof chip.When the reverse schottky diode of both direction can prevent the multifrequency networking of many bases, radar echo signal is crossed and is forced the saturation of receiver, and amplitude limit intensity is positive and negative 250mV.Lightning-proof chip is used for thunderstorm weather and takes shelter from the thunder, and can play lightning protection effect.
First transceiver insulation switch 2-1 and the second transceiver insulation switch 2-2 receives the signal exported from front end lightning limitation protection circuit 1, and two-stage transceiver insulation switch enhances system receive-transmit isolation, ensures that isolation is greater than 60dB.The first order is for connecting front end lightning limitation protection circuit 1 and low noise amplifier 3; Another level to be placed between low noise amplifier 3 and power divider 4.Described first transceiver insulation switch 2-1 and the second transceiver insulation switch 2-2 controls break-make by control circuit 7.
The noise figure of described low noise amplifier 3 is low, amplifies for the first time radar echo signal.
Power divider 4 receives the signal of the second transceiver insulation switch 2-2, and the multiple-frequency signal received by radar is divided into multichannel.Hou Mei road signal accesses preselection filter 5 respectively along separate routes, and the centre frequency of the described preselection filter 5 in every road is different, and the multiple-frequency signal received by radar leaches, and suppresses other frequency band signals.Below in conjunction with accompanying drawing 1, for dual-frequency radar, the utility model is described in detail.When the signal received is divided into two-way by described power divider 4, the centre frequency of the preselection filter 5 wherein in a road is 8MHz, for being come by the Signal separator of 7.5 ~ 8.5MHz frequency range; The centre frequency of the preselection filter 5 in another road is 12MHz, for being come by the Signal separator of 11.5 ~ 12.5MHz frequency range.Visible, the preselection filter 5 in this two-way is respectively used to the Signal separator of 7.5 ~ 8.5MHz and 11.5 ~ 12.5MHz, two frequency ranges to come, and suppresses the signal of other frequency range, insertion gain controllable amplifier 6 afterwards.
Gain controlled amplifier 6 receives the signal of preselection filter 5, and carries out gain control to this signal, and the different frequency signals that can receive according to radar amplifies, and can arrange gain flexibly, finally access late-class circuit.
Control circuit 7 is connected with the first transceiver insulation switch 2-1, the second transceiver insulation switch 2-2 and gain controlled amplifier 6 respectively, controls the break-make of the first transceiver insulation switch 2-1, the second transceiver insulation switch 2-2 according to practical application.Under the multifrequency networking model of many bases of complexity, control circuit 7 regulates the gain of gain controlled amplifier 6 according to actual conditions, makes multistatic radar be operated in optimum condition.
Specific embodiment described herein is only to the utility model explanation for example.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present utility model or surmount the scope that appended claims defines.
Claims (4)
1. one kind is applicable to the high frequency over the horizon radar AFE (analog front end) of many bases multifrequency networking, it is characterized in that, the circuit connected successively comprises front end lightning limitation protection circuit (1), first transceiver insulation switch (2-1), low noise amplifier (3), second transceiver insulation switch (2-2), power divider (4), be divided into multichannel afterwards: every road composition comprises preselection filter (5) all successively, gain controlled amplifier (6), also comprise control circuit (7), described control circuit (7) respectively with the first transceiver insulation switch (2-1), gain controlled amplifier (6) in second transceiver insulation switch (2-2) and often road connects,
Wherein, the centre frequency of the preselection filter (5) in every road is different.
2. a kind of high frequency over the horizon radar AFE (analog front end) being applicable to the multifrequency networking of many bases according to claim 1; it is characterized in that; described lightning limitation protection circuit (1) comprises the contrary schottky diode of both direction and lightning-proof chip, and amplitude limit intensity is positive and negative 250mV.
3. a kind of high frequency over the horizon radar AFE (analog front end) being applicable to the multifrequency networking of many bases according to claim 1, it is characterized in that, the break-make of described first transceiver insulation switch (2-1) and the second transceiver insulation switch (2-2) is controlled by control circuit (7), adopt two-stage cascade in circuit, ensure that the isolation of transmitting-receiving is greater than 60dB.
4. a kind of high frequency over the horizon radar AFE (analog front end) being applicable to the multifrequency networking of many bases according to claim 1, it is characterized in that, the signal received is divided into two-way by described power divider (4), the centre frequency of the preselection filter (5) wherein in a road is 8MHz, for being come by the Signal separator of 7.5 ~ 8.5MHz frequency range; The centre frequency of the preselection filter (5) in another road is 12MHz, for being come by the Signal separator of 11.5 ~ 12.5MHz frequency range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520800661.2U CN205027894U (en) | 2015-10-13 | 2015-10-13 | High frequency over --horizon radar analog front end suitable for multifrequency network deployment of many bases |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520800661.2U CN205027894U (en) | 2015-10-13 | 2015-10-13 | High frequency over --horizon radar analog front end suitable for multifrequency network deployment of many bases |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205027894U true CN205027894U (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520800661.2U Expired - Fee Related CN205027894U (en) | 2015-10-13 | 2015-10-13 | High frequency over --horizon radar analog front end suitable for multifrequency network deployment of many bases |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205027894U (en) |
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2015
- 2015-10-13 CN CN201520800661.2U patent/CN205027894U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160210 Termination date: 20191013 |
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| CF01 | Termination of patent right due to non-payment of annual fee |