CN207096458U - Realize the radio frequency reception channel circuit of anti-interference antenna of satellite navigation - Google Patents
Realize the radio frequency reception channel circuit of anti-interference antenna of satellite navigation Download PDFInfo
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- CN207096458U CN207096458U CN201720732556.9U CN201720732556U CN207096458U CN 207096458 U CN207096458 U CN 207096458U CN 201720732556 U CN201720732556 U CN 201720732556U CN 207096458 U CN207096458 U CN 207096458U
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Abstract
The utility model discloses a kind of radio frequency reception channel circuit for realizing anti-interference antenna of satellite navigation.Radio frequency reception channel circuit includes pre-filtering amplitude limiter circuit, LNA circuit, lower frequency changer circuit, automatic gain control circuit and intermediate frequency filtering circuit.The design has selectivity to signal, it is suppressed that out-of-band interference signal and caused spurious signal, has to resist and burns function（30dBm）There is very big dynamic range, meet not produce distortion during signal amplitude change, signal output is controlled within 0dB, noise coefficient ensures within 1.2, make signal transmit in the channel in signal-to-noise ratio degradation it is minimum, ensure signal by normal work during the nonlinear devices such as LNA, frequency mixer, automatic growth control.Automatic gain control circuit is formed by the related resistors electric capacity of a chip and periphery matching, automatic gain control circuit is simplified, reduces circuit complexity and power consumption.
Description
Technical field
It the utility model is related to anti-interference antenna of satellite navigation, and in particular to a kind of anti-interference antenna of satellite navigation realized
Radio frequency reception channel circuit.
Background technology
Radio frequency reception channel is that the necessary circuitry of satellite high-frequency signal is handled in anti-interference antenna of satellite navigation, is not only needed
Very low noise, good sensitivity, also there is certain dynamic range to ensure its interference free performance.Original radio frequency reception leads to
Road circuit reception signal dynamic range is small, and signal-selectivity is poor, does not possess to resist and burns function, circuit is complicated, and debugging is cumbersome.
The content of the invention
In view of the shortcomings of the prior art, the utility model provides a kind of circuit and simply realizes that satellite navigation is anti-dry
Disturb the radio frequency reception channel circuit of antenna.The circuit can receive -133dBm weak satellite signal, can also receive jamming-to-signal ratio
For 80-90dB big interference signal, ensure the distortionless transmission of signal while reducing noise.
The utility model is adopted the technical scheme that to achieve the above object：One kind realizes anti-interference antenna of satellite navigation
Radio frequency reception channel circuit, it is characterised in that：The radio frequency reception channel circuit includes pre-filtering amplitude limiter circuit, LNA
Circuit, lower frequency changer circuit, automatic gain control circuit and intermediate frequency filtering circuit, wherein pre-filtering amplitude limiter circuit discharge with low noise
Road is connected, and LNA circuit is connected with lower frequency changer circuit, lower frequency changer circuit and automatic gain control circuit and intermediate frequency filtering circuit
Connection.
Design principle of the present utility model：Radio frequency reception channel shares 3 essential part compositions, including pre-filtering amplitude limit
LNA circuit, lower frequency changer circuit, automatic gain control circuit.The radiofrequency signal of the BD from antenna array component is received, first
Radio frequency amplification is carried out after front-end preselection wave filter and limiter to antenna array signal；BD signals after radio frequency amplification are filtered
46.52 ± 10.23MHz IF output signals are obtained into frequency mixer down-converted after enhanced processing again, after being sent to
Level intermediate-frequency channel is handled, and automatic growth control ensures intermediate-freuqncy signal within the specific limits, and intermediate frequency is exported by intermediate frequency filtering
Signal.
The characteristics of the utility model is：There is selectivity to signal, it is suppressed that out-of-band interference signal and caused spuious
Signal, have to resist and burn function（30dBm）, have very big dynamic range, meet not produce distortion, signal during signal amplitude change
Within 0dB, noise coefficient ensures within 1.2 output control, make signal transmit in the channel in signal-to-noise ratio degradation it is minimum, electricity
Road can receive -133dBm weak satellite signal, can also receive the big interference signal that jamming-to-signal ratio is 80-90dB, have foot
Enough high linear, normal works when guarantee signal passes through the nonlinear devices such as LNA, frequency mixer, automatic growth control.Pass through
One AD8368 chip and the related resistors electric capacity composition automatic gain control circuit of periphery matching, simplify automatic gain control
Circuit processed.Front end increases automatic increase using the high dielectric filter suppressed and corresponding powerful limiter in medium frequency output end
Beneficial control circuit, automatic growth control is realized by an AD8368 chip, reduces circuit complexity and power consumption.
Brief description of the drawings
Fig. 1 is that the utility model circuit theory connects block diagram；
Fig. 2 is the utility model pre-filtering amplitude limiter circuit, LNA circuit catenation principle figure；
Fig. 3 is the utility model lower frequency changer circuit catenation principle figure；
Fig. 4 is the utility model automatic gain control circuit, intermediate frequency filtering circuit catenation principle figure.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Reference picture 1, radio frequency reception channel circuit include pre-filtering amplitude limiter circuit, LNA circuit, lower frequency changer circuit, from
Dynamic gain control circuit and intermediate frequency filtering circuit, wherein pre-filtering amplitude limiter circuit are connected with LNA circuit, LNA circuit
It is connected with lower frequency changer circuit, lower frequency changer circuit is connected with automatic gain control circuit and intermediate frequency filtering circuit.
Reference picture 2, pre-filtering amplitude limiter circuit of the present utility model, LNA circuit use CPD1268M20B wave filters
U1, SMP1330-005 limiter U2, MGA-633P8 amplifier U3, SF2186E SAW filter U4, are specifically connected as：Filtering
Device U1 1 pin connects limiter U2 3 pin and electric capacity C1 one end as signal input part, wave filter U1 2 pin, limiter U2's
1 pin, 2 pin ground connection, electric capacity C1 other end connection amplifier U3 2 pin and inductance L1 one end, inductance L1 another termination electricity
Hold C5 and resistance R4 one end, electric capacity C5 other end ground connection, resistance R4 another termination capacitor C2, resistance R2 one end, electricity
Hold C2 other end ground connection, the resistance R2 other end and electric capacity C4 one end, a resistance R3 termination+5V power supplys, electric capacity C4's
The other end is grounded, resistance R3 other end connection electric capacity C6 one end and inductance L2 one end, electric capacity C6 other end ground connection, electricity
Feel L2 another termination amplifier U3 7 pin, amplifier U3 3 pin, 4 pin, 5 pin, 6 pin, 8 pin ground connection, amplifier U3 1 pin connects
Electric capacity C5 one end, amplifier U3 7 pin connect electric capacity C3 one end, electric capacity C3 another terminating resistor R5, resistance R6 one end,
Resistance R5 another termination SAW filter U4 2 pin and resistance R7 one end, resistance R6, resistance R7 other end ground connection,
SAW filter U4 5 pin connect electric capacity C7 one end, SAW filter U4 1 pin, 3 pin, 4 pin, 6 pins ground connection.
Reference picture 3, lower frequency changer circuit of the present utility model use the frequency mixer U6 of MGA-53543 amplifiers U5, CMY 210,
Specifically it is connected as：Amplifier U5 3 pin are connected to the other end of electric capacity C7 in LNA circuit, amplifier U5 2 pin connection inductance
L3, electric capacity C8 one end, amplifier U5 1 pin, 4 pin ground connection, inductance L3 other end connection electric capacity C9, electric capacity C10, resistance R8
One end, electric capacity C9, electric capacity C10 the other end ground connection, resistance R8 another termination+5V power supplys, electric capacity C8 the other end connection
Inductance L5 one end, inductance L5 other end connection electric capacity C11 one end, 1 pin of the electric capacity C11 other end as frequency mixer U6
Input, electric capacity C12 one end connection inductance L7 one end, inductance L7 other end connection frequency mixer U6 3 pin, inductance L6
One end be connected with frequency mixer U6 4 pin, the inductance L6 other end is connected with electric capacity C14 one end is followed by+3V power supplys, electric capacity
C14 other end ground connection, frequency mixer U6 6 pin connect inductance L4, electric capacity C13 one end as output end, and 2, the 5 of frequency mixer U6
Pin is grounded, and inductance L4, the electric capacity C13 other end connect electric capacity C15 one end, electric capacity C15 other end connection resistance R9, resistance
R10 one end, resistance R9 other end connection R11 one end, resistance R10, resistance R11 other end ground connection.
Reference picture 4, automatic gain control circuit, intermediate frequency filtering circuit use AD8368 automatic gaining controling chip U7, tool
Body is connected as：Electric capacity C16 one end is connected to the resistance R9 other end and R11 one end in lower frequency changer circuit, and electric capacity C16's is another
One end connection automatic gaining controling chip U7 19 pin, automatic gaining controling chip U7 22,23,24 pins connection electric capacity C20,
Electric capacity C21 one end is followed by+5V power supplys, and electric capacity C20, the electric capacity C21 other end are grounded, and the 14 of automatic gaining controling chip U7
One end of pin, 15 pin connection electric capacity C17, electric capacity C17 other end ground connection, 9,10,11, the 12 of automatic gaining controling chip U7 draws
Pin connection electric capacity C23, electric capacity C25 one end, electric capacity C23, electric capacity C25 other end ground connection, the 1 of automatic gaining controling chip U7
One end of pin, 2 pin connection electric capacity C22, electric capacity C22 other end ground connection, automatic gaining controling chip U7 3 pins connection electric capacity
C24 one end, electric capacity C24 other end ground connection, automatic gaining controling chip U7 4 pin connection resistance R13 one end, resistance
R13 other end connection automatic gaining controling chip U7 5 pin, electric capacity C26 one end and resistance R12 one end, electric capacity C26's
The other end is grounded, resistance R12 other end connection automatic gaining controling chip U7 8 pin and electric capacity C18 one end, automatic gain
Control chip U7 6 pin, 7 pin, 16 pin, 17 pin, 18 pin, 20 pin, 21 pin ground connection, electric capacity C18 other end connection LC wave filters
U8 1 pin, LC wave filters U8 2 pin are connected with electric capacity C19 one end, LC wave filters U8 3 pin, 4 pin ground connection, electric capacity C19's
Another termination signal output part.
The technical indicator that this circuit reaches：
1st, input signal：1268.52MHz±10.23MHz；
2nd, noise coefficient：≤ 2.0 (containing LNA and front-end preselection frequency wave filters)；
3rd, channel gain：40 ± 1dB (contains LNA)；
4th, channel isolation：≥50dB；
5th, IF signal frequency is exported：46.52MHz±10.23MHz；
6th, intermediate-freuqncy signal amplitude is exported：7±0.5dBm （When -33dBm is inputted）；
7th, intermediate-freuqncy signal three dB bandwidth is exported： 21±1MHz；
8th, Out-of-band rejection：At f0 ± 16MHz >=35dB；
9th, third order intermodulation：≥50dBc（Two-frequency signal with interior input -40dBm frequency intervals 1MHz）
10th, gain error between road：≤1.0dB；
11st, phase difference between output intermediate-freuqncy signal road：± 5 degree（Band center）.
Claims (4)
- A kind of 1. radio frequency reception channel circuit for realizing anti-interference antenna of satellite navigation, it is characterised in that：The radio frequency reception leads to Road circuit includes pre-filtering amplitude limiter circuit, LNA circuit, lower frequency changer circuit, automatic gain control circuit and intermediate frequency filtering electricity Road, wherein pre-filtering amplitude limiter circuit are connected with LNA circuit, and LNA circuit is connected with lower frequency changer circuit, lower frequency changer circuit It is connected with automatic gain control circuit and intermediate frequency filtering circuit.
- 2. the radio frequency reception channel circuit according to claim 1 for realizing anti-interference antenna of satellite navigation, it is characterised in that： Pre-filtering amplitude limiter circuit, LNA circuit use CPD1268M20B wave filter U1, SMP1330-005 limiters U2, MGA- 633P8 amplifier U3, SF2186E SAW filter U4, are specifically connected as：Wave filter U1 1 pin is as signal input part, filtering Device U1 2 pin connect limiter U2 3 pin and electric capacity C1 one end, limiter U2 1 pin, 2 pin ground connection, and the electric capacity C1 other end connects Amplifier U3 2 pin and inductance L1 one end are connect, inductance L1 another termination capacitor C5 and resistance R4 one end, electric capacity C5's is another One end is grounded, resistance R4 another termination capacitor C2, resistance R2 one end, and electric capacity C2 other end ground connection, resistance R2's is another End and electric capacity C4 one end, a resistance R3 termination+5V power supplys, electric capacity C4 other end ground connection, resistance R3 other end connection Electric capacity C6 one end and inductance L2 one end, electric capacity C6 other end ground connection, inductance L2 another termination amplifier U3 7 pin, Amplifier U3 3 pin, 4 pin, 5 pin, 6 pin, 8 pin ground connection, amplifier U3 1 pin connect electric capacity C5 one end, and amplifier U3 7 pin connect Electric capacity C3 one end, electric capacity C3 another terminating resistor R5, resistance R6 one end, resistance R5 another termination SAW filter U4 2 pin and resistance R7 one end, resistance R6, resistance R7 other end ground connection, SAW filter U4 5 pin connect the one of electric capacity C7 End, SAW filter U4 1 pin, 3 pin, 4 pin, 6 pins ground connection.
- 3. the radio frequency reception channel circuit according to claim 2 for realizing anti-interference antenna of satellite navigation, it is characterised in that： Lower frequency changer circuit uses the frequency mixer U6 of MGA-53543 amplifiers U5, CMY 210, is specifically connected as：Amplifier U5 3 pin are connected to The electric capacity C7 other end in LNA circuit, amplifier U5 2 pin connection inductance L3, electric capacity C8 one end, the 1 of amplifier U5 Pin, 4 pin ground connection, inductance L3 other end connection electric capacity C9, electric capacity C10, resistance R8 one end, electric capacity C9, electric capacity C10 it is another End ground connection, resistance R8 another termination+5V power supplys, electric capacity C8 other end connection inductance L5 one end, the inductance L5 other end Connect electric capacity C11 one end, the input of the electric capacity C11 other end as frequency mixer U6 1 pin, electric capacity C12 one end connects Inductance L7 one end, inductance L7 other end connection frequency mixer U6 3 pin, inductance L6 one end are connected with frequency mixer U6 4 pin, The inductance L6 other end is connected with electric capacity C14 one end is followed by+3V power supplys, electric capacity C14 other end ground connection, and the 6 of frequency mixer U6 The one end of pin as output end connection inductance L4, electric capacity C13, frequency mixer U6 2,5 pin ground connection, inductance L4, electric capacity C13 it is another End connection electric capacity C15 one end, electric capacity C15 other end connection resistance R9, resistance R10 one end, the resistance R9 other end connect Connect R11 one end, resistance R10, resistance R11 other end ground connection.
- 4. according to claim 3 one realizes the radio frequency reception channel circuit of anti-interference antenna of satellite navigation, its feature exists In：Automatic gain control circuit, intermediate frequency filtering circuit use AD8368 automatic gaining controling chip U7, are specifically connected as：Electric capacity C16 one end is connected to the resistance R9 other end and R11 one end in lower frequency changer circuit, and electric capacity C16 other end connection is automatic Gain control chip U7 19 pin, automatic gaining controling chip U7 22,23,24 pins connection electric capacity C20, the one of electric capacity C21 End is followed by+5V power supplys, electric capacity C20, electric capacity C21 other end ground connection, automatic gaining controling chip U7 14 pin, 15 pin connection electricity Hold C17 one end, electric capacity C17 other end ground connection, automatic gaining controling chip U7 9,10,11,12 pins connection electric capacity C23, electric capacity C25 one end, electric capacity C23, electric capacity C25 other end ground connection, automatic gaining controling chip U7 1 pin, the connection of 2 pin Electric capacity C22 one end, electric capacity C22 other end ground connection, automatic gaining controling chip U7 3 pins connection electric capacity C24 one end, Electric capacity C24 other end ground connection, automatic gaining controling chip U7 4 pin connection resistance R13 one end, the resistance R13 other end Automatic gaining controling chip U7 5 pin, electric capacity C26 one end and resistance R12 one end is connected, the electric capacity C26 other end is grounded, Resistance R12 other end connection automatic gaining controling chip U7 8 pin and electric capacity C18 one end, automatic gaining controling chip U7 6 pin, 7 pin, 16 pin, 17 pin, 18 pin, 20 pin, 21 pin ground connection, electric capacity C18 other end connection LC wave filters U8 1 pin, LC Wave filter U8 2 pin are connected with electric capacity C19 one end, LC wave filters U8 3 pin, 4 pin ground connection, electric capacity C19 another termination letter Number output end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720732556.9U CN207096458U (en) | 2017-06-22 | 2017-06-22 | Realize the radio frequency reception channel circuit of anti-interference antenna of satellite navigation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720732556.9U CN207096458U (en) | 2017-06-22 | 2017-06-22 | Realize the radio frequency reception channel circuit of anti-interference antenna of satellite navigation |
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| CN207096458U true CN207096458U (en) | 2018-03-13 |
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| CN201720732556.9U Active CN207096458U (en) | 2017-06-22 | 2017-06-22 | Realize the radio frequency reception channel circuit of anti-interference antenna of satellite navigation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167818A (en) * | 2017-06-22 | 2017-09-15 | 天津七六四通信导航技术有限公司 | A kind of radio frequency reception channel circuit for realizing anti-interference antenna of satellite navigation |
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2017
- 2017-06-22 CN CN201720732556.9U patent/CN207096458U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167818A (en) * | 2017-06-22 | 2017-09-15 | 天津七六四通信导航技术有限公司 | A kind of radio frequency reception channel circuit for realizing anti-interference antenna of satellite navigation |
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