CN220040758U - Interferometer direction finding circuit - Google Patents

Abstract

The utility model relates to an interferometer direction-finding circuit, which is characterized in that echo signals received by corresponding antennas are amplified through two radio frequency amplifier circuits with the same structure to obtain amplified echo signals, then the corresponding amplified echo signals are respectively allocated and output by two mixer circuits with the same structure according to local oscillator signals sent by the local oscillator circuits, the two intermediate frequency signals are amplified through the two intermediate frequency amplifier circuits with the same structure to obtain corresponding amplified intermediate frequency signals, then the amplified intermediate frequency signals are respectively filtered and output through two intermediate frequency filter circuits with the same structure to obtain two target intermediate frequency signals, finally a phase difference signal is output by a phase discriminator circuit according to the phase difference between the two target intermediate frequency signals, thereby realizing interferometer direction-finding through simple circuit design and solving the problem of complex working frequency band of the interferometer direction-finding circuit.

Description

Interferometer direction finding circuit

Technical Field

The utility model relates to the field of radio direction finding, in particular to an interferometer direction finding circuit.

Background

At present, in the present society, radar has an indispensable function, is not only an indispensable electronic device in military, but also widely applied to social and economic development (such as weather forecast, resource detection, environmental monitoring, traffic control and other aspects) and scientific research (such as astronomical research, atmospheric physics, ionosphere structure research and other aspects). The interferometer direction finding is a common means for radar direction finding, the difference value of the received signals of the two antennas is detected through receiving the antenna signals, the output signal difference value is determined, and the radar determines the azimuth according to the signal difference value, but the conventional interferometer direction finding circuit is complex and has a narrow working frequency.

Therefore, it is necessary to provide an interferometer direction-finding circuit with a wide working frequency and a simple circuit structure for solving the problems of complex interferometer direction-finding circuit and narrow working frequency.

Disclosure of Invention

In view of the foregoing, it is necessary to provide an interferometer direction-finding circuit for solving the problems of complex interferometer direction-finding circuit and narrow operating frequency in the prior art.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

in a first aspect, the present utility model provides an interferometer direction finding circuit comprising: a radio frequency amplifier circuit, a mixer circuit, an intermediate frequency amplifier circuit, an intermediate frequency filter circuit, and a phase discriminator circuit; the radio frequency amplifier circuit comprises a first radio frequency amplifier circuit and a second radio frequency amplifier circuit, the mixer circuit comprises a first mixer circuit and a second mixer circuit, the intermediate frequency amplifier circuit comprises a first intermediate frequency amplifier circuit and a second intermediate frequency amplifier circuit, and the intermediate frequency filter circuit comprises a first intermediate frequency filter circuit and a second intermediate frequency filter circuit; the first radio frequency amplifier circuit, the first mixer circuit, the first intermediate frequency amplifier circuit, the first intermediate frequency filter circuit and the phase discriminator circuit are connected in sequence; the second radio frequency amplifier circuit, the second mixer circuit, the second intermediate frequency amplifier circuit, the second intermediate frequency filter circuit and the phase discriminator circuit are connected in sequence;

The first radio frequency amplifier circuit and the second radio frequency amplifier circuit are used for amplifying echo signals received by corresponding antennas to obtain a first discharge echo signal and a second amplified echo signal respectively;

the first mixer circuit and the second mixer circuit are used for respectively allocating the first amplified echo signal and the second amplified echo signal according to the local oscillation signal sent by the local oscillation circuit and respectively outputting a first intermediate frequency signal and a second intermediate frequency signal;

the first intermediate frequency amplifier circuit and the second intermediate frequency amplifier circuit are used for amplifying the first intermediate frequency signal and the second intermediate frequency signal respectively and outputting a first amplified intermediate frequency signal and a second amplified intermediate frequency signal respectively;

the first intermediate frequency filter circuit and the second intermediate frequency filter circuit are used for respectively filtering interference signals in the first amplified intermediate frequency signal and the second amplified intermediate frequency signal to respectively obtain a first target intermediate frequency signal and a second target intermediate frequency signal;

the phase discriminator circuit is used for determining a phase difference between the first target intermediate frequency signal and the second target intermediate frequency signal and outputting a phase difference signal.

Preferably, the first radio frequency amplifier circuit includes: the broadband integrated amplifier A1, capacitors C1, C2, C3, C6 and C7, a resistor R1, a high Q wire winding inductance LQ1 and a magnetic bead L1;

The first pin of the broadband integrated amplifier A1 is connected with one end of the capacitor C6, the second pin of the broadband integrated amplifier A1 is grounded, the third pin of the broadband integrated amplifier A1 is used for connecting with one end of the capacitor C7, and the fourth pin of the broadband integrated amplifier A1 is grounded; one end of the high-Q wire-wound inductor LQ1 is connected with a third pin of the broadband integrated amplifier A1, the other end of the high-Q wire-wound inductor LQ1 is connected with one end of a resistor R1, and the other end of the capacitor C7 is connected with a first mixer circuit;

the other end of the capacitor C is connected with an antenna, one end of the capacitor C3 is grounded, the other end of the capacitor C3 is connected with the other end of the high-Q wire winding inductor LQ1, the other end of the resistor R1 is connected with one end of the capacitor C2, the other end of the capacitor C2 is grounded, one end of the magnetic bead L1 is connected with one end of the capacitor C2, the other end of the magnetic bead L1 is connected with one end of the capacitor C1, one end of the capacitor C1 is connected with a power supply, and the other end of the capacitor C1 is grounded.

Preferably, the first mixer circuit includes: a mixer U2;

the first pin of the mixer U2 is grounded, the second pin of the mixer U2 is connected with the first intermediate frequency amplifier circuit, the third pin of the mixer U2 is grounded, and the fourth pin of the mixer U2 is connected with the first radio frequency amplifier; the fifth pin, the sixth pin and the seventh pin of the mixer U2 are connected with the ground in parallel; the eighth pin of the mixer U2 is connected with a local oscillation circuit.

Preferably, the first intermediate frequency amplifier circuit includes: capacitors C20, C21, C15 and C16, an integrated amplifier A2, resistors R5, R7, R18, R19 and R42, a high Q wire wound inductor LQ3 and a magnetic bead L2;

a first pin of the integrated amplifier A2 is connected with one end of the capacitor C20, and a third pin of the integrated amplifier A2 is connected with one end of the capacitor C21;

the other end of the capacitor C20 is connected with the first mixer circuit, the other end of the capacitor C21 is connected with one end of the resistor R19, one end of the capacitor C16 is connected with one end of the inductor LQ3, the other end of the capacitor C16 is grounded, and one end of the capacitor C15 is grounded with the other end of the capacitor C15;

one end of the resistor R7 is connected with the first pin of the integrated amplifier A2, the other end of the resistor R7 is connected with the third pin of the integrated amplifier A2, one end of the resistor R18 is connected with one end of the resistor R19, the other end of the resistor R18 is grounded, one end of the resistor R19 is connected with one end of the capacitor C21, the other end of the resistor R19 is connected with a first intermediate frequency filter, one end of the resistor R42 is connected with one end of the high Q wire winding inductor LQ3, the other end of the resistor R42 is connected with one end of the magnetic bead L2, the other end of the magnetic bead L2 is connected with one end of the resistor R42, one end of the resistor R5 is connected with one end of the high Q wire winding inductor LQ3, the other end of the resistor R5 is connected with one end of the magnetic bead L2, and the other end of the magnetic bead L2 is connected with a power supply of 5.5V.

Preferably, the first intermediate frequency filter circuit includes: capacitor C18, filter LF1, power divider F1;

one end of the capacitor C18 is connected with the first intermediate frequency amplifier circuit, the other end of the capacitor C18 is connected with the first pin of the filter LF1, the third pin of the filter LF1 is grounded, the second pin of the filter LF1 is connected with the second pin of the power divider F1, the fifth pin of the power divider F1 is connected with the phase discriminator circuit, the first pin and the third pin of the power divider F1 are connected with each other in parallel, and the fourth pin and the sixth pin of the power divider F1 are connected with each other in parallel.

Preferably, the second radio frequency amplifier circuit comprises a broadband integrated amplifier A3, capacitors C51, C52, C53, C55 and C56, a resistor R53, a high Q wire wound inductor LQ2 and a magnetic bead L3;

a first pin of the broadband integrated amplifier A3 is connected with one end of the capacitor C56, a second pin of the broadband integrated amplifier A3 is grounded, a third pin of the broadband integrated amplifier A3 is connected with one end of the capacitor C55, and a fourth pin of the broadband integrated amplifier A3 is grounded; one end of the high-Q wire-wound inductor LQ2 is connected with a third pin of the broadband integrated amplifier A3, the other end of the high-Q wire-wound inductor LQ2 is connected with one end of a resistor R53, and the other end of the capacitor C55 is connected with a first mixer circuit;

The other end of the capacitor C56 is connected with an antenna, one end of the capacitor C54 is grounded, the other end of the capacitor C54 is connected with the other end of the high-Q wire winding inductor LQ2, the other end of the resistor R53 is connected with one end of the capacitor C52, the other end of the capacitor C52 is grounded, one end of the magnetic bead L3 is connected with one end of the capacitor C52, the other end of the magnetic bead L3 is connected with one end of the capacitor C51, one end of the capacitor C51 is connected with a power supply, and the other end of the capacitor C51 is grounded.

Preferably, the second mixer circuit includes: a mixer U3;

the first pin of the mixer U3 is grounded, the second pin of the mixer U3 is connected with the second intermediate frequency amplifier circuit, the third pin of the mixer U3 is grounded, and the fourth pin of the mixer U2 is connected with the first radio frequency amplifier; the fifth pin, the sixth pin and the seventh pin of the mixer U3 are connected with the ground in parallel; the eighth pin of the mixer U3 is connected with a local oscillation circuit.

Preferably, the second intermediate frequency amplifier circuit includes: capacitors C62, C63, C61, C64, integrated amplifier A4, resistors R31, R34, R33, R32, R30, high Q wire wound inductance LQ4, magnetic bead L4;

A first pin of the integrated amplifier A4 is connected with one end of the capacitor C62, and a third pin of the integrated amplifier A4 is connected with one end of the capacitor C63;

the other end of the capacitor C62 is connected with the first mixer circuit, the other end of the capacitor C63 is connected with one end of the resistor R32, one end of the capacitor C64 is connected with one end of the inductor LQ4, the other end of the capacitor C64 is grounded, and one end of the capacitor C61 is grounded with the other end of the capacitor C61;

one end of the resistor R34 is connected with the first pin of the integrated amplifier A4, the other end of the resistor R34 is connected with the third pin of the integrated amplifier A4, one end of the resistor R33 is connected with one end of the resistor R32, the other end of the resistor R33 is grounded, one end of the resistor R32 is connected with one end of the capacitor C63, the other end of the resistor R32 is connected with the first intermediate frequency filter, one end of the resistor R30 is connected with one end of the high Q wire winding inductance LQ4, the other end of the resistor R30 is connected with one end of the magnetic bead L4, the other end of the magnetic bead L4 is connected with one end of the resistor R30, one end of the resistor R31 is connected with one end of the high Q wire winding inductance LQ4, the other end of the resistor R31 is connected with one end of the magnetic bead L4, and the other end of the magnetic bead L4 is connected with a power supply of 5.5V.

Preferably, the second intermediate frequency filter circuit includes: capacitor C38, filter LF2, power divider F4;

one end of the capacitor C38 is connected to the first intermediate frequency amplifier circuit, the other end of the capacitor C38 is connected to the first pin of the filter LF2, the third pin of the filter LF2 is grounded, the second pin of the filter LF2 is connected to the second pin of the power divider F4, the fifth pin of the power divider F4 is connected to the phase detector circuit, the first pin and the third pin of the power divider F4 are connected to ground, and the fourth pin and the sixth pin of the power divider F4 are connected to ground.

Preferably, the phase detector circuit includes: phase detector chip U1, capacitors C10, C11, C12, C13, C14, C15, C16, resistors R3, R5, R6, R8, R9;

the first pin of the phase detector chip U1 is grounded, the second pin of the phase detector chip U1 is connected with one end of the capacitor C12, the third pin of the phase detector chip U1 is connected with one end of the capacitor C10, the fourth pin of the phase detector chip U1 is connected with a power supply, the fifth pin of the phase detector chip U1 is connected with one end of the capacitor C14, the sixth pin of the phase detector chip U1 is connected with one end of the capacitor C16, the seventh pin of the phase detector chip U1 is grounded, the eighth pin of the phase detector chip U1 is connected with one end of the capacitor C15, the ninth pin of the phase detector chip U1 is connected with one end of the resistor R8, the eleventh pin of the phase detector chip U1 is connected with one end of the resistor R5, the twelfth pin of the phase detector chip U1 is connected with one end of the resistor R3, and the thirteenth pin of the phase detector chip U1 is connected with one end of the resistor R3;

The other end of the capacitor C14 is connected with the first intermediate frequency amplifier circuit, the other end of the capacitor C16 is connected with the second intermediate frequency amplifier circuit, the other end of the capacitor C13 is grounded, the other end of the capacitor C10 is grounded, the other end of the capacitor C14 is grounded, the other end of the capacitor C11 is grounded, and the other end of the capacitor C15 is grounded;

one end of the resistor R6 is connected with the first intermediate frequency amplifier circuit, the other end of the resistor R6 is grounded, and the other end of the resistor R5 is grounded.

The beneficial effects of adopting the embodiment are as follows: the first and second radio frequency amplifier circuits amplify echo signals received by corresponding antennas to obtain first discharge echo signals and second amplified echo signals respectively, then the first and second mixer circuits allocate the first amplified echo signals and the second amplified echo signals respectively according to local oscillator signals sent by the local oscillator circuits to output first intermediate frequency signals and second intermediate frequency signals respectively, then the first and second intermediate frequency amplifier circuits amplify the first intermediate frequency signals and the second intermediate frequency signals respectively to output first amplified intermediate frequency signals and second amplified intermediate frequency signals respectively, then the first and second intermediate frequency filter circuits filter interference signals in the first amplified intermediate frequency signals and the second amplified intermediate frequency signals respectively to obtain first target intermediate frequency signals and second target intermediate frequency signals, and finally the phase discriminator circuits are used for determining phase difference output signals between the two signals according to the first target intermediate frequency signals and the second target intermediate frequency signals.

Drawings

FIG. 1 is a schematic diagram of an interferometer direction-finding circuit according to an embodiment of the present utility model;

fig. 2 is a schematic circuit diagram of an embodiment of a first rf amplifier circuit according to the present utility model;

FIG. 3 is a circuit diagram illustrating an embodiment of a first mixer circuit according to the present utility model;

FIG. 4 is a circuit diagram illustrating an embodiment of a first IF amplifier circuit according to the present utility model;

FIG. 5 is a circuit diagram illustrating an embodiment of a first IF filter circuit according to the present utility model;

fig. 6 is a circuit diagram of a second rf amplifier circuit according to an embodiment of the present utility model;

FIG. 7 is a circuit diagram illustrating a second mixer circuit according to an embodiment of the present utility model;

FIG. 8 is a circuit diagram illustrating an embodiment of a second IF amplifier circuit according to the present utility model;

FIG. 9 is a circuit diagram illustrating an embodiment of a second IF filter circuit according to the present utility model;

fig. 10 is a circuit configuration diagram of an embodiment of a phase detector circuit according to the present utility model.

Detailed Description

The following detailed description of preferred embodiments of the utility model is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the utility model, are used to explain the principles of the utility model and are not intended to limit the scope of the utility model.

In the circuit diagrams in the drawings, A, B, C, D, E, F, G, H indicates the connection relationship of the different circuit diagrams.

In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an interferometer direction-finding circuit provided by the present utility model, and a specific embodiment of the present utility model discloses an interferometer direction-finding circuit, which includes: a radio frequency amplifier circuit 100, a mixer circuit 200, an intermediate frequency amplifier circuit 300, an intermediate frequency filter circuit 400, and a phase detector circuit 500; the radio frequency amplifier 100 circuit includes: a first radio frequency amplifier circuit 101 and a second radio frequency amplifier circuit 102, the mixer circuit 200 comprising: a first mixer circuit 201 and a second mixer circuit 202, the intermediate frequency amplifier circuit, 300: including a first intermediate frequency amplifier circuit 301 and a second intermediate frequency amplifier circuit 302, the intermediate frequency filter circuit 400 comprising: a first intermediate frequency filter circuit 401 and a second intermediate frequency filter circuit 402; the first radio frequency amplifier circuit 101, the first mixer circuit 201, the first intermediate frequency amplifier circuit 301, the first intermediate frequency filter circuit 401 and the phase discriminator circuit 500 are connected in sequence; the second rf amplifier circuit 102, the second mixer circuit 202, the second if amplifier circuit 302, the second if filter circuit 402, and the phase detector circuit 500 are sequentially connected;

The first rf amplifier circuit 101 and the second rf amplifier circuit 102 are configured to amplify echo signals received by corresponding antennas to obtain a first discharge echo signal and a second amplified echo signal, respectively;

the first mixer circuit 201 and the second mixer circuit 202 are configured to respectively allocate the first amplified echo signal and the second amplified echo signal according to the local oscillation signal sent by the local oscillation circuit, and respectively output a first intermediate frequency signal and a second intermediate frequency signal;

the first intermediate frequency amplifier circuit 301 and the second intermediate frequency amplifier circuit 302 are configured to amplify the first intermediate frequency signal and the second intermediate frequency signal respectively, and output a first amplified intermediate frequency signal and a second amplified intermediate frequency signal respectively;

the first intermediate frequency filter circuit 401 and the second intermediate frequency filter circuit 402 are configured to filter interference signals in the first amplified intermediate frequency signal and the second amplified intermediate frequency signal respectively to obtain a first target intermediate frequency signal and a second target intermediate frequency signal respectively;

the phase detector circuit 500 is configured to determine a phase difference between the first target intermediate frequency signal and the second target intermediate frequency signal and output a phase difference signal.

Compared with the prior art, the interferometer direction finding circuit provided by the embodiment of the invention has the advantages that the first radio frequency amplifier circuit and the second radio frequency amplifier circuit amplify echo signals received by corresponding antennas to obtain the first discharge echo signals and the second amplified echo signals respectively, then the first mixer circuit and the second mixer circuit respectively allocate the first amplified echo signals and the second amplified echo signals according to local oscillation signals sent by the local oscillation circuits to output the first intermediate frequency signals and the second intermediate frequency signals respectively, then the first intermediate frequency amplifier circuit and the second intermediate frequency amplifier circuit amplify the first intermediate frequency signals and the second intermediate frequency signals respectively to output the first amplified intermediate frequency signals and the second amplified intermediate frequency signals respectively, then the first intermediate frequency filter circuit and the second intermediate frequency filter circuit respectively filter interference signals in the first amplified intermediate frequency signals and the second amplified intermediate frequency signals to obtain the first target intermediate frequency signals and the second target intermediate frequency signals respectively, and finally the phase discriminator circuit is used for determining phase difference output phase difference signals between the two signals according to the first target intermediate frequency signals and the second target intermediate frequency signals, and the interferometer direction finding circuit is realized through simple circuit design, and the interferometer direction finding circuit has a narrow working frequency band.

Referring to fig. 2, fig. 2 is a schematic circuit diagram of an embodiment of a first rf amplifier circuit according to the present utility model, and in some embodiments of the present utility model, the first rf amplifier circuit includes: the broadband integrated amplifier A1, capacitors C1, C2, C3, C6 and C7, a resistor R1, a high Q wire winding inductance LQ1 and a magnetic bead L1;

the first pin of the broadband integrated amplifier A1 is connected with one end of the capacitor C6, the second pin of the broadband integrated amplifier A1 is grounded, the third pin of the broadband integrated amplifier A1 is used for connecting with one end of the capacitor C7, and the fourth pin of the broadband integrated amplifier A1 is grounded; one end of the high-Q wire-wound inductor LQ1 is connected with a third pin of the broadband integrated amplifier A1, the other end of the high-Q wire-wound inductor LQ1 is connected with one end of a resistor R1, and the other end of the capacitor C7 is connected with a first mixer circuit;

the other end of the capacitor C is connected with an antenna, one end of the capacitor C3 is grounded, the other end of the capacitor C3 is connected with the other end of the high-Q wire winding inductor LQ1, the other end of the resistor R1 is connected with one end of the capacitor C2, the other end of the capacitor C2 is grounded, one end of the magnetic bead L1 is connected with one end of the capacitor C2, the other end of the magnetic bead L1 is connected with one end of the capacitor C1, one end of the capacitor C1 is connected with a power supply, and the other end of the capacitor C1 is grounded.

In the above embodiment, the echo signal received by the corresponding antenna is amplified by the integrated amplifier to obtain a first amplified echo signal;

the broadband integrated amplifier SBB5089 is adopted, the working frequency range is DC-6 GHz, and the typical gain is 20dB.

Referring to fig. 3, fig. 3 is a circuit diagram of a first mixer circuit according to an embodiment of the present utility model, and in some embodiments of the present utility model, the first mixer circuit includes: a mixer U2;

the first pin of the mixer U2 is grounded, the second pin of the mixer U2 is connected with the first intermediate frequency amplifier circuit, the third pin of the mixer U2 is grounded, and the fourth pin of the mixer U2 is connected with the first radio frequency amplifier; the fifth pin, the sixth pin and the seventh pin of the mixer U2 are connected with the ground in parallel; the eighth pin of the mixer U2 is connected with a local oscillation circuit.

In the above embodiment, the mixer mixes the first amplified echo signal with the local oscillation signal to obtain the first intermediate frequency signal.

It is to be noted that, the passive three-section mixer SIM-83 is adopted, the working frequency band 2300-8000MHz is adopted, and the system working frequency and the local oscillation working frequency are satisfied.

Referring to fig. 4, fig. 4 is a circuit diagram of a first intermediate frequency amplifier circuit according to an embodiment of the present utility model, and in some embodiments of the present utility model, the first intermediate frequency amplifier circuit includes: capacitors C20, C21, C15 and C16, an integrated amplifier A2, resistors R5, R7, R18, R19 and R42, a high Q wire wound inductor LQ3 and a magnetic bead L2;

a first pin of the integrated amplifier A2 is connected with one end of the capacitor C20, and a third pin of the integrated amplifier A2 is connected with one end of the capacitor C21;

the other end of the capacitor C20 is connected with the first mixer circuit, the other end of the capacitor C21 is connected with one end of the resistor R19, one end of the capacitor C16 is connected with one end of the inductor LQ3, the other end of the capacitor C16 is grounded, and one end of the capacitor C15 is grounded with the other end of the capacitor C15;

one end of the resistor R7 is connected with the first pin of the integrated amplifier A2, the other end of the resistor R7 is connected with the third pin of the integrated amplifier A2, one end of the resistor R18 is connected with one end of the resistor R19, the other end of the resistor R18 is grounded, one end of the resistor R19 is connected with one end of the capacitor C21, the other end of the resistor R19 is connected with a first intermediate frequency filter, one end of the resistor R42 is connected with one end of the high Q wire winding inductor LQ3, the other end of the resistor R42 is connected with one end of the magnetic bead L2, the other end of the magnetic bead L2 is connected with one end of the resistor R42, one end of the resistor R5 is connected with one end of the high Q wire winding inductor LQ3, the other end of the resistor R5 is connected with one end of the magnetic bead L2, and the other end of the magnetic bead L2 is connected with a power supply of 5.5V.

In the above embodiment, the first intermediate frequency signal is amplified by the amplifier to obtain a first amplified intermediate frequency signal.

Referring to fig. 5, fig. 5 is a circuit diagram of a first intermediate frequency filter circuit according to an embodiment of the present utility model, and in some embodiments of the present utility model, the first intermediate frequency filter circuit includes: capacitor C18, filter LF1, power divider F1;

one end of the capacitor C18 is connected with the first intermediate frequency amplifier circuit, the other end of the capacitor C18 is connected with the first pin of the filter LF1, the third pin of the filter LF1 is grounded, the second pin of the filter LF1 is connected with the second pin of the power divider F1, the fifth pin of the power divider F1 is connected with the phase discriminator circuit, the first pin and the third pin of the power divider F1 are connected with each other in parallel, and the fourth pin and the sixth pin of the power divider F1 are connected with each other in parallel.

In the above embodiment, the first intermediate frequency amplified signal is filtered by the filter to obtain the first target intermediate frequency signal.

Referring to fig. 6, fig. 6 is a circuit diagram of an embodiment of a second rf amplifier circuit provided by the present utility model, and in some embodiments of the present utility model, the second rf amplifier circuit includes a wideband integrated amplifier A3, capacitors C51, C52, C53, C55, C56, a resistor R53, a high Q wire wound inductor LQ2, and a magnetic bead L3;

A first pin of the broadband integrated amplifier A3 is connected with one end of the capacitor C56, a second pin of the broadband integrated amplifier A3 is grounded, a third pin of the broadband integrated amplifier A3 is connected with one end of the capacitor C55, and a fourth pin of the broadband integrated amplifier A3 is grounded; one end of the high-Q wire-wound inductor LQ2 is connected with a third pin of the broadband integrated amplifier A3, the other end of the high-Q wire-wound inductor LQ2 is connected with one end of a resistor R53, and the other end of the capacitor C55 is connected with a first mixer circuit;

the other end of the capacitor C56 is connected with an antenna, one end of the capacitor C54 is grounded, the other end of the capacitor C54 is connected with the other end of the high-Q wire winding inductor LQ2, the other end of the resistor R53 is connected with one end of the capacitor C52, the other end of the capacitor C52 is grounded, one end of the magnetic bead L3 is connected with one end of the capacitor C52, the other end of the magnetic bead L3 is connected with one end of the capacitor C51, one end of the capacitor C51 is connected with a power supply, and the other end of the capacitor C51 is grounded.

In a specific embodiment, the echo signal received by the corresponding antenna is amplified by an integrated amplifier to obtain a second amplified echo signal;

The first rf amplifier circuit and the second rf amplifier circuit have the same circuit structure.

Referring to fig. 7, fig. 7 is a circuit diagram of a second mixer circuit according to an embodiment of the present utility model, and in some embodiments of the present utility model, the second mixer circuit includes: a mixer U3;

the first pin of the mixer U3 is grounded, the second pin of the mixer U3 is connected with the second intermediate frequency amplifier circuit, the third pin of the mixer U3 is grounded, and the fourth pin of the mixer U2 is connected with the first radio frequency amplifier; the fifth pin, the sixth pin and the seventh pin of the mixer U3 are connected with the ground in parallel; the eighth pin of the mixer U3 is connected with a local oscillation circuit.

In the above embodiment, the mixer mixes the second amplified echo signal with the local oscillation signal to obtain the first intermediate frequency signal.

The first mixer circuit and the second mixer circuit have two circuits having the same circuit configuration.

Referring to fig. 8, fig. 8 is a circuit diagram of a second intermediate frequency amplifier circuit according to an embodiment of the present utility model, and in some embodiments of the present utility model, the second intermediate frequency amplifier circuit includes: capacitors C62, C63, C61, C64, integrated amplifier A4, resistors R31, R34, R33, R32, R30, high Q wire wound inductance LQ4, magnetic bead L4;

A first pin of the integrated amplifier A4 is connected with one end of the capacitor C62, and a third pin of the integrated amplifier A4 is connected with one end of the capacitor C63;

the other end of the capacitor C62 is connected with the first mixer circuit, the other end of the capacitor C63 is connected with one end of the resistor R32, one end of the capacitor C64 is connected with one end of the inductor LQ4, the other end of the capacitor C64 is grounded, and one end of the capacitor C61 is grounded with the other end of the capacitor C61;

one end of the resistor R34 is connected with the first pin of the integrated amplifier A4, the other end of the resistor R34 is connected with the third pin of the integrated amplifier A4, one end of the resistor R33 is connected with one end of the resistor R32, the other end of the resistor R33 is grounded, one end of the resistor R32 is connected with one end of the capacitor C63, the other end of the resistor R32 is connected with the first intermediate frequency filter, one end of the resistor R30 is connected with one end of the high Q wire winding inductance LQ4, the other end of the resistor R30 is connected with one end of the magnetic bead L4, the other end of the magnetic bead L4 is connected with one end of the resistor R30, one end of the resistor R31 is connected with one end of the high Q wire winding inductance LQ4, the other end of the resistor R31 is connected with one end of the magnetic bead L4, and the other end of the magnetic bead L4 is connected with a power supply of 5.5V.

In the above embodiment, the second intermediate frequency signal is amplified by the amplifier to obtain a second amplified intermediate frequency signal.

The first intermediate frequency amplifier circuit and the second intermediate frequency amplifier circuit are two circuits with the same structure.

Referring to fig. 9, fig. 9 is a circuit diagram of a second intermediate frequency filter circuit according to an embodiment of the present utility model, and in some embodiments of the present utility model, the second intermediate frequency filter circuit includes: capacitor C38, filter LF2, power divider F4;

one end of the capacitor C38 is connected to the first intermediate frequency amplifier circuit, the other end of the capacitor C38 is connected to the first pin of the filter LF2, the third pin of the filter LF2 is grounded, the second pin of the filter LF2 is connected to the second pin of the power divider F4, the fifth pin of the power divider F4 is connected to the phase detector circuit, the first pin and the third pin of the power divider F4 are connected to ground, and the fourth pin and the sixth pin of the power divider F4 are connected to ground.

In the above embodiments, referring to fig. 10, fig. 10 is a circuit diagram of an embodiment of a phase detector circuit according to the present utility model, and in some embodiments of the present utility model, the phase detector circuit includes: phase detector chip U1, capacitors C10, C11, C12, C13, C14, C15, C16, resistors R3, R5, R6, R8, R9;

The first pin of the phase detector chip U1 is grounded, the second pin of the phase detector chip U1 is connected with one end of the capacitor C12, the third pin of the phase detector chip U1 is connected with one end of the capacitor C10, the fourth pin of the phase detector chip U1 is connected with a power supply, the fifth pin of the phase detector chip U1 is connected with one end of the capacitor C14, the sixth pin of the phase detector chip U1 is connected with one end of the capacitor C16, the seventh pin of the phase detector chip U1 is grounded, the eighth pin of the phase detector chip U1 is connected with one end of the capacitor C15, the ninth pin of the phase detector chip U1 is connected with one end of the resistor R8, the eleventh pin of the phase detector chip U1 is connected with one end of the resistor R5, the twelfth pin of the phase detector chip U1 is connected with one end of the resistor R3, and the thirteenth pin of the phase detector chip U1 is connected with one end of the resistor R3;

the other end of the capacitor C14 is connected with the first intermediate frequency amplifier circuit, the other end of the capacitor C16 is connected with the second intermediate frequency amplifier circuit, the other end of the capacitor C13 is grounded, the other end of the capacitor C10 is grounded, the other end of the capacitor C14 is grounded, the other end of the capacitor C11 is grounded, and the other end of the capacitor C15 is grounded;

One end of the resistor R6 is connected with the first intermediate frequency amplifier circuit, the other end of the resistor R6 is grounded, and the other end of the resistor R5 is grounded.

In the above embodiment, the phase detector circuit receives the first target intermediate frequency signal and the second target intermediate frequency signal, determines the phase difference between the two signals, and outputs the phase difference signal.

It should be noted that the model of the phase discriminator is AD8302, which can measure the gain and phase difference of two input signals in the frequency range from low frequency to 2.7 GHz; the gain and the phase difference of circuits such as an amplifier, a mixer and the like can be measured; the dynamic range of the two input signals when measuring gain is

30dB, the sensitivity of the output level is 30mV/dB, and the error is less than 0.5dB.

In a specific circuit, R6 and R9 are input source matching resistors, and the resistance value is 52.3 ohms; r8 is a 1K resistor, the resistor is analog output, and the output load can be adjusted; r3 and R5 are buffer resistors, and a resistor is connected in series between the outputs to play a role in voltage buffer; c12 C16 is a DC blocking capacitor; c10, a power decoupling capacitor; c11 C15 is a video signal filter capacitor, which can be related to video signal bandwidth; c13 C14, providing an alternating current to ground path, and having high pass effect;

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model.

Claims (10)

1. An interferometer direction finding circuit, comprising: a radio frequency amplifier circuit, a mixer circuit, an intermediate frequency amplifier circuit, an intermediate frequency filter circuit, and a phase discriminator circuit; the radio frequency amplifier circuit comprises a first radio frequency amplifier circuit and a second radio frequency amplifier circuit, the mixer circuit comprises a first mixer circuit and a second mixer circuit, the intermediate frequency amplifier circuit comprises a first intermediate frequency amplifier circuit and a second intermediate frequency amplifier circuit, and the intermediate frequency filter circuit comprises a first intermediate frequency filter circuit and a second intermediate frequency filter circuit; the first radio frequency amplifier circuit, the first mixer circuit, the first intermediate frequency amplifier circuit, the first intermediate frequency filter circuit and the phase discriminator circuit are connected in sequence; the second radio frequency amplifier circuit, the second mixer circuit, the second intermediate frequency amplifier circuit, the second intermediate frequency filter circuit and the phase discriminator circuit are connected in sequence;

The first radio frequency amplifier circuit and the second radio frequency amplifier circuit are used for amplifying echo signals received by corresponding antennas to obtain a first discharge echo signal and a second amplified echo signal respectively;

the first mixer circuit and the second mixer circuit are used for respectively allocating the first amplified echo signal and the second amplified echo signal according to the local oscillation signal sent by the local oscillation circuit and respectively outputting a first intermediate frequency signal and a second intermediate frequency signal;

the first intermediate frequency amplifier circuit and the second intermediate frequency amplifier circuit are used for amplifying the first intermediate frequency signal and the second intermediate frequency signal respectively and outputting a first amplified intermediate frequency signal and a second amplified intermediate frequency signal respectively;

the first intermediate frequency filter circuit and the second intermediate frequency filter circuit are used for respectively filtering interference signals in the first amplified intermediate frequency signal and the second amplified intermediate frequency signal to respectively obtain a first target intermediate frequency signal and a second target intermediate frequency signal;

the phase discriminator circuit is used for determining a phase difference between the first target intermediate frequency signal and the second target intermediate frequency signal and outputting a phase difference signal.

2. The interferometer direction finding circuit of claim 1, wherein the first radio frequency amplifier circuit comprises: the broadband integrated amplifier A1, capacitors C1, C2, C3, C6 and C7, a resistor R1, a high Q wire winding inductance LQ1 and a magnetic bead L1;

The first pin of the broadband integrated amplifier A1 is connected with one end of the capacitor C6, the second pin of the broadband integrated amplifier A1 is grounded, the third pin of the broadband integrated amplifier A1 is used for connecting with one end of the capacitor C7, and the fourth pin of the broadband integrated amplifier A1 is grounded; one end of the high-Q wire-wound inductor LQ1 is connected with a third pin of the broadband integrated amplifier A1, the other end of the high-Q wire-wound inductor LQ1 is connected with one end of a resistor R1, and the other end of the capacitor C7 is connected with a first mixer circuit;

the other end of the capacitor C is connected with an antenna, one end of the capacitor C3 is grounded, the other end of the capacitor C3 is connected with the other end of the high-Q wire winding inductor LQ1, the other end of the resistor R1 is connected with one end of the capacitor C2, the other end of the capacitor C2 is grounded, one end of the magnetic bead L1 is connected with one end of the capacitor C2, the other end of the magnetic bead L1 is connected with one end of the capacitor C1, one end of the capacitor C1 is connected with a power supply, and the other end of the capacitor C1 is grounded.

3. An interferometer direction finding circuit according to claim 2 wherein the first mixer circuit comprises: a mixer U2;

The first pin of the mixer U2 is grounded, the second pin of the mixer U2 is connected with the first intermediate frequency amplifier circuit, the third pin of the mixer U2 is grounded, and the fourth pin of the mixer U2 is connected with the first radio frequency amplifier; the fifth pin, the sixth pin and the seventh pin of the mixer U2 are connected with the ground in parallel; the eighth pin of the mixer U2 is connected with a local oscillation circuit.

4. The interferometer direction finding circuit of claim 1, wherein the first intermediate frequency amplifier circuit comprises: capacitors C20, C21, C15 and C16, an integrated amplifier A2, resistors R5, R7, R18, R19 and R42, a high Q wire wound inductor LQ3 and a magnetic bead L2;

a first pin of the integrated amplifier A2 is connected with one end of the capacitor C20, and a third pin of the integrated amplifier A2 is connected with one end of the capacitor C21;

the other end of the capacitor C20 is connected with the first mixer circuit, the other end of the capacitor C21 is connected with one end of the resistor R19, one end of the capacitor C16 is connected with one end of the inductor LQ3, the other end of the capacitor C16 is grounded, and one end of the capacitor C15 is grounded with the other end of the capacitor C15;

One end of the resistor R7 is connected with the first pin of the integrated amplifier A2, the other end of the resistor R7 is connected with the third pin of the integrated amplifier A2, one end of the resistor R18 is connected with one end of the resistor R19, the other end of the resistor R18 is grounded, one end of the resistor R19 is connected with one end of the capacitor C21, the other end of the resistor R19 is connected with a first intermediate frequency filter, one end of the resistor R42 is connected with one end of the high Q wire winding inductor LQ3, the other end of the resistor R42 is connected with one end of the magnetic bead L2, the other end of the magnetic bead L2 is connected with one end of the resistor R42, one end of the resistor R5 is connected with one end of the high Q wire winding inductor LQ3, the other end of the resistor R5 is connected with one end of the magnetic bead L2, and the other end of the magnetic bead L2 is connected with a power supply of 5.5V.

5. The interferometer direction finding circuit of claim 1, wherein the first intermediate frequency filter circuit comprises: capacitor C18, filter LF1, power divider F1;

one end of the capacitor C18 is connected with the first intermediate frequency amplifier circuit, the other end of the capacitor C18 is connected with the first pin of the filter LF1, the third pin of the filter LF1 is grounded, the second pin of the filter LF1 is connected with the second pin of the power divider F1, the fifth pin of the power divider F1 is connected with the phase discriminator circuit, the first pin and the third pin of the power divider F1 are connected with each other in parallel, and the fourth pin and the sixth pin of the power divider F1 are connected with each other in parallel.

6. The interferometer direction finding circuit of claim 1, wherein the second radio frequency amplifier circuit comprises a wideband integrated amplifier A3, capacitors C51, C52, C53, C55, C56, resistor R53, high Q wire wound inductance LQ2, magnetic bead L3;

a first pin of the broadband integrated amplifier A3 is connected with one end of the capacitor C56, a second pin of the broadband integrated amplifier A3 is grounded, a third pin of the broadband integrated amplifier A3 is connected with one end of the capacitor C55, and a fourth pin of the broadband integrated amplifier A3 is grounded; one end of the high-Q wire-wound inductor LQ2 is connected with a third pin of the broadband integrated amplifier A3, the other end of the high-Q wire-wound inductor LQ2 is connected with one end of a resistor R53, and the other end of the capacitor C55 is connected with a first mixer circuit;

the other end of the capacitor C56 is connected with an antenna, one end of the capacitor C54 is grounded, the other end of the capacitor C54 is connected with the other end of the high-Q wire winding inductor LQ2, the other end of the resistor R53 is connected with one end of the capacitor C52, the other end of the capacitor C52 is grounded, one end of the magnetic bead L3 is connected with one end of the capacitor C52, the other end of the magnetic bead L3 is connected with one end of the capacitor C51, one end of the capacitor C51 is connected with a power supply, and the other end of the capacitor C51 is grounded.

7. An interferometer direction finding circuit according to claim 2 wherein the second mixer circuit comprises: a mixer U3;

the first pin of the mixer U3 is grounded, the second pin of the mixer U3 is connected with the second intermediate frequency amplifier circuit, the third pin of the mixer U3 is grounded, and the fourth pin of the mixer U2 is connected with the first radio frequency amplifier; the fifth pin, the sixth pin and the seventh pin of the mixer U3 are connected with the ground in parallel; the eighth pin of the mixer U3 is connected with a local oscillation circuit.

8. The interferometer direction finding circuit of claim 1, wherein the second intermediate frequency amplifier circuit comprises: capacitors C62, C63, C61, C64, integrated amplifier A4, resistors R31, R34, R33, R32, R30, high Q wire wound inductance LQ4, magnetic bead L4;

a first pin of the integrated amplifier A4 is connected with one end of the capacitor C62, and a third pin of the integrated amplifier A4 is connected with one end of the capacitor C63;

the other end of the capacitor C62 is connected with the first mixer circuit, the other end of the capacitor C63 is connected with one end of the resistor R32, one end of the capacitor C64 is connected with one end of the inductor LQ4, the other end of the capacitor C64 is grounded, and one end of the capacitor C61 is grounded with the other end of the capacitor C61;

One end of the resistor R34 is connected with the first pin of the integrated amplifier A4, the other end of the resistor R34 is connected with the third pin of the integrated amplifier A4, one end of the resistor R33 is connected with one end of the resistor R32, the other end of the resistor R33 is grounded, one end of the resistor R32 is connected with one end of the capacitor C63, the other end of the resistor R32 is connected with the first intermediate frequency filter, one end of the resistor R30 is connected with one end of the high Q wire winding inductance LQ4, the other end of the resistor R30 is connected with one end of the magnetic bead L4, the other end of the magnetic bead L4 is connected with one end of the resistor R30, one end of the resistor R31 is connected with one end of the high Q wire winding inductance LQ4, the other end of the resistor R31 is connected with one end of the magnetic bead L4, and the other end of the magnetic bead L4 is connected with a power supply of 5.5V.

9. An interferometer direction finding circuit according to claim 1 wherein the second intermediate frequency filter circuit comprises: capacitor C38, filter LF2, power divider F4;

one end of the capacitor C38 is connected to the first intermediate frequency amplifier circuit, the other end of the capacitor C38 is connected to the first pin of the filter LF2, the third pin of the filter LF2 is grounded, the second pin of the filter LF2 is connected to the second pin of the power divider F4, the fifth pin of the power divider F4 is connected to the phase detector circuit, the first pin and the third pin of the power divider F4 are connected to ground, and the fourth pin and the sixth pin of the power divider F4 are connected to ground.

10. An interferometer direction finding circuit according to claim 1 wherein the phase detector circuit comprises: phase detector chip U1, capacitors C10, C11, C12, C13, C14, C15, C16, resistors R3, R5, R6, R8, R9;

the first pin of the phase detector chip U1 is grounded, the second pin of the phase detector chip U1 is connected with one end of the capacitor C12, the third pin of the phase detector chip U1 is connected with one end of the capacitor C10, the fourth pin of the phase detector chip U1 is connected with a power supply, the fifth pin of the phase detector chip U1 is connected with one end of the capacitor C14, the sixth pin of the phase detector chip U1 is connected with one end of the capacitor C16, the seventh pin of the phase detector chip U1 is grounded, the eighth pin of the phase detector chip U1 is connected with one end of the capacitor C15, the ninth pin of the phase detector chip U1 is connected with one end of the resistor R8, the eleventh pin of the phase detector chip U1 is connected with one end of the resistor R5, the twelfth pin of the phase detector chip U1 is connected with one end of the resistor R3, and the thirteenth pin of the phase detector chip U1 is connected with one end of the resistor R3;

The other end of the capacitor C14 is connected with the first intermediate frequency amplifier circuit, the other end of the capacitor C16 is connected with the second intermediate frequency amplifier circuit, the other end of the capacitor C13 is grounded, the other end of the capacitor C10 is grounded, the other end of the capacitor C14 is grounded, the other end of the capacitor C11 is grounded, and the other end of the capacitor C15 is grounded;

one end of the resistor R6 is connected with the first intermediate frequency amplifier circuit, the other end of the resistor R6 is grounded, and the other end of the resistor R5 is grounded.