Ku-band dual-antenna interference cancellation module

Abstract

The invention discloses a Ku-band dual-antenna interference cancellation module, and relates to the field of measurement and control communication. The Ku wave band amplitude and phase control system comprises a Ku wave band amplitude and phase control module, a Ku wave band coupling module, a Ku wave band detection module and a control module, an omnidirectional antenna is configured to actively collect interference signals, and the interference signals are subjected to amplitude-phase processing and then are added with interference signals received by a low-sidelobe directional antenna in an equal-amplitude and inverted mode, so that interference cancellation is achieved. The interference cancellation module is small in insertion loss and high in signal sampling, control and coupling precision, so that high-precision control over the amplitude and the phase is achieved, the cancellation capacity of the whole cancellation module is extremely high, and the bad influence of interference signals on data link receiving signals can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of measurement, control and communication, and in particular to a Ku-band dual-antenna interference cancellation module. Background Art

[0002] When the ground-to-air data link is working, the antenna may receive interference signals from the outside. When the interference signal is outside the receiving working frequency band, the transceiver duplex filter before the LNA can suppress the interference signal. The degree of suppression of the interference signal depends on the interval between the interference signal and the working frequency band and the out-of-band suppression capability of the transceiver duplex filter; when the interference signal is within the receiving working frequency band, the transceiver duplexer has no suppression capability. Since the received signal and the interference signal have different frequencies, the received signal is converted into an intermediate frequency signal after frequency conversion. The interference signal is different from the intermediate frequency after frequency conversion. The intermediate frequency filter can suppress it. The degree of suppression of the interference signal depends on the interval between the interference signal and the receiving frequency and the out-of-band suppression capability of the intermediate frequency filter; when the interference signal is the same or similar to the receiving frequency, the duplex filter and the intermediate frequency filter have no suppression capability for the interference signal, which will have a great impact on the data link, causing the noise of the receiving link to deteriorate, the gain to decrease, and the receiving sensitivity to decrease. Summary of the invention

[0003] In view of this, the present invention proposes a Ku-band dual-antenna interference cancellation module. The module, together with the low sidelobe directional antenna and the omnidirectional antenna, forms an "asymmetric two-element phased array". The module has low insertion loss and high signal sampling, control and synthesis accuracy. It can greatly reduce the adverse effects of interference signals on data link reception signals.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A Ku-band dual-antenna interference cancellation module, comprising a Ku-band amplitude and phase control module, a Ku-band coupling module, a Ku-band detection module and a control module;

[0006] The Ku-band amplitude and phase control module receives the spatial interference signal transmitted by the Ku-band omnidirectional antenna, and sends it to the Ku-band coupling module after performing corresponding phase and amplitude adjustments;

[0007] The Ku-band coupling module receives the spatial interference signal sent by the Ku-band amplitude and phase control module and the working frequency band interference signal sent by the Ku-band low sidelobe directional antenna, and the Ku-band coupling module performs interference cancellation and multi-path synthesis on the spatial interference signal and the working frequency band interference signal, wherein the signal after interference cancellation is the output signal of the Ku-band dual-antenna interference cancellation module, and the multi-path synthesized signal is transmitted to the Ku-band detection module;

[0008] The Ku-band detection module receives the multi-channel composite signal sent by the Ku-band coupling module, performs detection and outputs it to the control module;

[0009] The control module obtains corresponding phase control voltage and attenuation control voltage according to the multi-channel signals detected by the Ku-band detection module and outputs them to the Ku-band amplitude and phase control module.

[0010] Furthermore, the Ku-band amplitude and phase control module includes an electrically adjustable phase shifter and an electrically adjustable attenuator, the signal input end of the electrically adjustable phase shifter is connected to the Ku-band omnidirectional antenna, the signal output end of the electrically adjustable phase shifter is connected to the signal input port of the electrically adjustable attenuator, and the signal output end of the electrically adjustable attenuator is connected to the Ku-band coupling module; the control interfaces of the electrically adjustable phase shifter and the electrically adjustable attenuator respectively receive the phase control voltage and attenuation control voltage output by the control module.

[0011] Further, the Ku-band coupling module includes a first coupler to a seventh coupler, a first power divider and a second power divider; the first coupler to the seventh coupler each include an input port, a coupling port and an output port, and the first power divider and the second power divider each include an input port and three output ports;

[0012] The input port of the first coupler is connected to the Ku-band low sidelobe directional antenna, the output port of the first coupler is connected to the input port of the third coupler, and the coupling port of the first coupler is connected to the input port of the first power divider;

[0013] The input port of the second coupler is connected to the output port of the electrically adjustable attenuator, the output port of the second coupler is connected to the coupling port of the third coupler, and the coupling port of the second coupler is connected to the input port of the second power divider;

[0014] The output port of the third coupler outputs an output signal after interference cancellation;

[0015] The first output port of the first power divider is connected to the input port of the fifth coupler, the second output port of the first power divider is connected to the input port of the fourth coupler, and the third output port of the first power divider is connected to the input port of the sixth coupler;

[0016] The signal output from the first output port of the second power divider is subjected to a phase lag of -30 degrees and then input to the coupling port of the fourth coupler, the second output port of the second power divider is connected to the input port of the seventh coupler, and the signal output from the third output port of the second power divider is subjected to a phase lead of +30 degrees and then input to the coupling port of the fifth coupler;

[0017] The coupling port of the sixth coupler and the output port of the seventh coupler are both connected to a load.

[0018] Further, the Ku-band detection module includes a first detector to a fourth detector;

[0019] The input port of the first detector is connected to the coupling port of the seventh coupler in the Ku-band coupling module, the input port of the second detector is connected to the output port of the sixth coupler in the Ku-band coupling module, the input port of the third detector is connected to the output port of the fifth coupler in the Ku-band coupling module, and the input port of the fourth detector is connected to the output port of the fourth coupler in the Ku-band coupling module;

[0020] The output ports of the first to fourth detectors output a first amplitude detection voltage, a second amplitude detection voltage, a first phase detection voltage, and a second phase detection voltage, respectively.

[0021] Further, the control module includes a first comparator, a second comparator, a first driver and a second driver;

[0022] The two input ports of the first comparator receive the first amplitude detection voltage and the second amplitude detection voltage of the Ku-band detection module respectively, the output port of the first comparator is connected to the input port of the first driver, and the output port of the first driver is connected to the control port of the electrically adjustable attenuator in the Ku-band amplitude and phase control module;

[0023] The two input ports of the second comparator receive the first phase detection voltage and the second phase detection voltage of the Ku-band detection module respectively; the output port of the second comparator is connected to the input port of the second driver, and the output port of the second driver is connected to the control port of the electrically adjustable phase shifter in the Ku-band amplitude and phase control module;

[0024] When the first amplitude detection voltage is greater than the second amplitude detection voltage, the attenuation control voltage output by the first driver increases, and the gain of the corresponding channel of the Ku-band omnidirectional antenna increases; when the first amplitude detection voltage is less than the second amplitude detection voltage, the attenuation control voltage output by the first driver decreases, and the gain of the corresponding channel of the Ku-band omnidirectional antenna decreases; when the first amplitude detection voltage is equal to the second amplitude detection voltage, the attenuation control voltage output by the first driver remains unchanged, and the gain of the corresponding channel of the Ku-band omnidirectional antenna remains unchanged;

[0025] When the first phase detection voltage is greater than the second phase detection voltage, the second driver output phase control voltage increases, and the phase of the channel corresponding to the Ku-band omnidirectional antenna increases; when the first phase detection voltage is less than the second phase detection voltage, the second driver output phase control voltage decreases, and the phase of the channel corresponding to the Ku-band omnidirectional antenna decreases; when the first phase detection voltage is equal to the second phase detection voltage, the second driver output phase control voltage remains unchanged, and the phase of the channel corresponding to the Ku-band omnidirectional antenna remains unchanged.

[0026] Due to the adoption of the above technical solution, the beneficial effects of the present invention compared with the prior art are:

[0027] 1. The present invention constructs a dual-antenna interference cancellation mode through a unique idea, configures an omnidirectional antenna to actively collect interference signals, uses the interference signals, and adds them with equal amplitude and anti-phase after amplitude and phase processing with the interference signals received by the low sidelobe directional antenna to achieve interference cancellation.

[0028] 2. The present invention has low insertion loss, high signal sampling, control and coupling accuracy, thereby achieving high-precision control of amplitude and phase, making the cancellation capability of the entire cancellation module extremely high, and can greatly reduce the adverse effects of interference signals on data link reception signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a schematic diagram of the overall structure of a Ku-band dual-antenna interference cancellation module in an embodiment of the present invention.

[0030] Figure 2 Schematic diagram of the structure of the Ku-band amplitude and phase control module in an embodiment of the present invention.

[0031] Figure 3 Schematic diagram of the structure of the Ku-band coupling module in an embodiment of the present invention.

[0032] Figure 4 Schematic diagram of the structure of the Ku-band detection module in an embodiment of the present invention.

[0033] Figure 5 Schematic diagram of the structure of the control module in the embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] A Ku-band dual-antenna interference cancellation module, such as Figure 1 As shown, it includes a Ku-band amplitude and phase control module, a Ku-band coupling module, a Ku-band detection module and a control module;

[0036] The Ku-band amplitude and phase control module receives the spatial interference signal transmitted by the Ku-band omnidirectional antenna, and sends it to the Ku-band coupling module after performing corresponding phase and amplitude adjustments;

[0037] The Ku-band coupling module receives the spatial interference signal sent by the Ku-band amplitude and phase control module and the working frequency band interference signal sent by the Ku-band low sidelobe directional antenna, and the Ku-band coupling module performs interference cancellation and multi-path synthesis on the spatial interference signal and the working frequency band interference signal, wherein the signal after interference cancellation is the output signal of the Ku-band dual-antenna interference cancellation module, and the multi-path synthesized signal is transmitted to the Ku-band detection module;

[0038] Specifically, in this embodiment, the interference cancellation outputs a signal to a subsequent low noise amplifier (LNA);

[0039] The Ku-band detection module receives the multi-channel composite signal sent by the Ku-band coupling module, performs detection and outputs it to the control module;

[0040] The control module obtains corresponding phase control voltage and attenuation control voltage according to the multi-channel signals detected by the Ku-band detection module and outputs them to the Ku-band amplitude and phase control module.

[0041] Furthermore, if Figure 2 As shown, the Ku-band amplitude and phase control module includes an electrically adjustable phase shifter and an electrically adjustable attenuator, the signal input end of the electrically adjustable phase shifter is connected to the Ku-band omnidirectional antenna, the signal output end of the electrically adjustable phase shifter is connected to the signal input port of the electrically adjustable attenuator, and the signal output end of the electrically adjustable attenuator is connected to the Ku-band coupling module; the control interfaces of the electrically adjustable phase shifter and the electrically adjustable attenuator respectively receive the phase control voltage and the attenuation control voltage output by the control module.

[0042] Specifically, in this embodiment, the phase shift range of the electrically adjustable phase shifter is 360°, and the external control voltage is 0 to 14V. To ensure the consistency of the external control circuit parameters, the phase shift linearity is 20° / V to 30° / V. The attenuation range of the electrically adjustable attenuator is 30dB, and the external control voltage is 0 to 5V. To ensure the consistency of the external control circuit parameters, the attenuation linearity is 5dB / V to 8dB / V.

[0043] Furthermore, if Figure 3 As shown, the Ku-band coupling module includes a first coupler to a seventh coupler, a first power divider and a second power divider; the first coupler to the seventh coupler each include an input port, a coupling port and an output port, and the first power divider and the second power divider each include an input port and three output ports;

[0044] The input port of the first coupler is connected to the Ku-band low sidelobe directional antenna, the output port of the first coupler is connected to the input port of the third coupler, and the coupling port of the first coupler is connected to the input port of the first power divider;

[0045] The input port of the second coupler is connected to the output port of the electrically adjustable attenuator, the output port of the second coupler is connected to the coupling port of the third coupler, and the coupling port of the second coupler is connected to the input port of the second power divider;

[0046] The output port of the third coupler outputs an output signal after interference cancellation;

[0047] The first output port of the first power divider is connected to the input port of the fifth coupler, the second output port of the first power divider is connected to the input port of the fourth coupler, and the third output port of the first power divider is connected to the input port of the sixth coupler;

[0048] The signal output from the first output port of the second power divider is subjected to a phase lag of -30 degrees and then input to the coupling port of the fourth coupler, the second output port of the second power divider is connected to the input port of the seventh coupler, and the signal output from the third output port of the second power divider is subjected to a phase lead of +30 degrees and then input to the coupling port of the fifth coupler;

[0049] The coupling port of the sixth coupler and the output port of the seventh coupler are both connected to a load.

[0050] Furthermore, if Figure 4 As shown, the Ku-band detection module includes a first detector to a fourth detector;

[0051] The input port of the first detector is connected to the coupling port of the seventh coupler in the Ku-band coupling module, the input port of the second detector is connected to the output port of the sixth coupler in the Ku-band coupling module, the input port of the third detector is connected to the output port of the fifth coupler in the Ku-band coupling module, and the input port of the fourth detector is connected to the output port of the fourth coupler in the Ku-band coupling module;

[0052] The output ports of the first to fourth detectors output a first amplitude detection voltage, a second amplitude detection voltage, a first phase detection voltage, and a second phase detection voltage, respectively.

[0053] Specifically, in this embodiment, the amplitude range of the input signal of the 4-channel detector is -60 to 0dBm, and the output voltage is 0 to 5V. In order to ensure the normal function of the Ku-band front-end component, the output detection voltage of the 4-channel detector should have a certain consistency when the input signal frequency and amplitude are the same. When the input signal amplitude is -45 to 0dBm, the detection consistency is ±0.5dB; when the input signal amplitude is -60 to -45dBm, the detection consistency is ±1.5dB.

[0054] Furthermore, if Figure 5 As shown, the control module includes a first comparator, a second comparator, a first driver and a second driver;

[0055] The two input ports of the first comparator receive the first amplitude detection voltage and the second amplitude detection voltage of the Ku-band detection module respectively, the output port of the first comparator is connected to the input port of the first driver, and the output port of the first driver is connected to the control port of the electrically adjustable attenuator in the Ku-band amplitude and phase control module;

[0056] The two input ports of the second comparator receive the first phase detection voltage and the second phase detection voltage of the Ku-band detection module respectively; the output port of the second comparator is connected to the input port of the second driver, and the output port of the second driver is connected to the control port of the electrically adjustable phase shifter in the Ku-band amplitude and phase control module;

[0057] When the first amplitude detection voltage is greater than the second amplitude detection voltage, the attenuation control voltage output by the first driver increases, and the gain of the corresponding channel of the Ku-band omnidirectional antenna increases; when the first amplitude detection voltage is less than the second amplitude detection voltage, the attenuation control voltage output by the first driver decreases, and the gain of the corresponding channel of the Ku-band omnidirectional antenna decreases; when the first amplitude detection voltage is equal to the second amplitude detection voltage, the attenuation control voltage output by the first driver remains unchanged, and the gain of the corresponding channel of the Ku-band omnidirectional antenna remains unchanged;

[0058] When the first phase detection voltage is greater than the second phase detection voltage, the second driver output phase control voltage increases, and the phase of the channel corresponding to the Ku-band omnidirectional antenna increases; when the first phase detection voltage is less than the second phase detection voltage, the second driver output phase control voltage decreases, and the phase of the channel corresponding to the Ku-band omnidirectional antenna decreases; when the first phase detection voltage is equal to the second phase detection voltage, the second driver output phase control voltage remains unchanged, and the phase of the channel corresponding to the Ku-band omnidirectional antenna remains unchanged.

[0059] The control module cooperates with the Ku-band amplitude and phase control module to realize automatic gain control and automatic phase control of the omnidirectional channel, ensuring that the omnidirectional signal and the directional signal at the output end of the Ku-band coupling module have equal amplitudes and opposite phases, thereby achieving interference cancellation.

[0060] Specifically, in this embodiment, the Ku-band low sidelobe directional antenna receives an external interference signal of 13GHz, and the interference signal amplitude is -25dBm, which will cause LNA saturation. The gain of the Ku-band omnidirectional antenna is 20dB greater than that of the Ku-band low sidelobe directional antenna, and the collected interference signal amplitude is -15dBm. The interference signal received by the Ku-band omnidirectional antenna is sent to the Ku-band amplitude and phase control module, and after amplitude and phase adjustment, it is sent to the Ku-band coupling module to couple and add with the interference signal sent by the Ku-band low sidelobe directional antenna.

[0061] The Ku-band coupling module couples and samples the signal at the same time, and outputs 2 amplitude sampling signals and 2 phase sampling signals. The Ku-band detection module detects the 4 sampling signals and outputs 4 detection voltages to the monitoring module. The monitoring module processes the 4 detection voltages and outputs the amplitude and phase control voltages to the Ku-band amplitude and phase control module. Finally, the signal amplitude detected at the LNA input port after the 13GHz interference signal is cancelled is -58dBm, and the impact on the reception of the data link has been greatly reduced.

[0062] In summary, the present invention constructs a dual-antenna interference cancellation mode through a unique idea, configures an omnidirectional antenna to actively collect interference signals, and uses the interference signals, after amplitude and phase processing, to add the interference signals received by the low sidelobe directional antenna with equal amplitude and anti-phase to achieve interference cancellation. The interference cancellation module has low insertion loss, high signal sampling, control, and coupling accuracy, thereby achieving high-precision control of amplitude and phase, making the cancellation capability of the entire cancellation module extremely high, and can greatly reduce the adverse effects of interference signals on data link reception signals.

[0063] Those skilled in the art will appreciate that the embodiments described are intended to help readers understand the principles of the present invention, and should be understood that the scope of protection of the present invention is not limited to the embodiments described. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A Ku-band dual-antenna interference cancellation module, characterized in that: It includes a Ku-band amplitude and phase control module, a Ku-band coupling module, a Ku-band detection module and a control module; The Ku-band amplitude and phase control module receives the spatial interference signal transmitted by the Ku-band omnidirectional antenna, and sends it to the Ku-band coupling module after performing corresponding phase and amplitude adjustments; The Ku-band coupling module receives the spatial interference signal sent by the Ku-band amplitude and phase control module and the working frequency band interference signal sent by the Ku-band low sidelobe directional antenna, and the Ku-band coupling module performs interference cancellation and multi-path synthesis on the spatial interference signal and the working frequency band interference signal, wherein the signal after interference cancellation is the output signal of the Ku-band dual-antenna interference cancellation module, and the multi-path synthesized signal is transmitted to the Ku-band detection module; The Ku-band detection module receives the multi-channel composite signal sent by the Ku-band coupling module, performs detection and outputs it to the control module; The control module obtains corresponding phase control voltage and attenuation control voltage according to the multi-channel signals detected by the Ku-band detection module and outputs them to the Ku-band amplitude and phase control module.

2. The Ku-band dual-antenna interference cancellation module according to claim 1, characterized in that: The Ku-band amplitude and phase control module includes an electrically adjustable phase shifter and an electrically adjustable attenuator, the signal input end of the electrically adjustable phase shifter is connected to the Ku-band omnidirectional antenna, the signal output end of the electrically adjustable phase shifter is connected to the signal input port of the electrically adjustable attenuator, and the signal output end of the electrically adjustable attenuator is connected to the Ku-band coupling module; the control interfaces of the electrically adjustable phase shifter and the electrically adjustable attenuator respectively receive the phase control voltage and attenuation control voltage output by the control module.

3. The Ku-band dual-antenna interference cancellation module according to claim 2, characterized in that: The Ku-band coupling module includes a first coupler to a seventh coupler, a first power divider and a second power divider; the first coupler to the seventh coupler each include an input port, a coupling port and an output port, and the first power divider and the second power divider each include an input port and three output ports; The input port of the first coupler is connected to the Ku-band low sidelobe directional antenna, the output port of the first coupler is connected to the input port of the third coupler, and the coupling port of the first coupler is connected to the input port of the first power divider; The input port of the second coupler is connected to the output port of the electrically adjustable attenuator, the output port of the second coupler is connected to the coupling port of the third coupler, and the coupling port of the second coupler is connected to the input port of the second power divider; The output port of the third coupler outputs an output signal after interference cancellation; The first output port of the first power divider is connected to the input port of the fifth coupler, the second output port of the first power divider is connected to the input port of the fourth coupler, and the third output port of the first power divider is connected to the input port of the sixth coupler; The signal output from the first output port of the second power divider is subjected to a phase lag of -30 degrees and then input to the coupling port of the fourth coupler, the second output port of the second power divider is connected to the input port of the seventh coupler, and the signal output from the third output port of the second power divider is subjected to a phase lead of +30 degrees and then input to the coupling port of the fifth coupler; The coupling port of the sixth coupler and the output port of the seventh coupler are both connected to a load.

4. The Ku-band dual-antenna interference cancellation module according to claim 3, characterized in that: The Ku-band detection module includes a first detector to a fourth detector; The input port of the first detector is connected to the coupling port of the seventh coupler in the Ku-band coupling module, the input port of the second detector is connected to the output port of the sixth coupler in the Ku-band coupling module, the input port of the third detector is connected to the output port of the fifth coupler in the Ku-band coupling module, and the input port of the fourth detector is connected to the output port of the fourth coupler in the Ku-band coupling module; The output ports of the first to fourth detectors output a first amplitude detection voltage, a second amplitude detection voltage, a first phase detection voltage, and a second phase detection voltage, respectively.

5. The Ku-band dual-antenna interference cancellation module according to claim 4, characterized in that: The control module includes a first comparator, a second comparator, a first driver and a second driver; The two input ports of the first comparator receive the first amplitude detection voltage and the second amplitude detection voltage of the Ku-band detection module respectively, the output port of the first comparator is connected to the input port of the first driver, and the output port of the first driver is connected to the control port of the electrically adjustable attenuator in the Ku-band amplitude and phase control module; The two input ports of the second comparator receive the first phase detection voltage and the second phase detection voltage of the Ku-band detection module respectively; the output port of the second comparator is connected to the input port of the second driver, and the output port of the second driver is connected to the control port of the electrically adjustable phase shifter in the Ku-band amplitude and phase control module; When the first amplitude detection voltage is greater than the second amplitude detection voltage, the attenuation control voltage output by the first driver increases, and the gain of the corresponding channel of the Ku-band omnidirectional antenna increases; when the first amplitude detection voltage is less than the second amplitude detection voltage, the attenuation control voltage output by the first driver decreases, and the gain of the corresponding channel of the Ku-band omnidirectional antenna decreases; when the first amplitude detection voltage is equal to the second amplitude detection voltage, the attenuation control voltage output by the first driver remains unchanged, and the gain of the corresponding channel of the Ku-band omnidirectional antenna remains unchanged; When the first phase detection voltage is greater than the second phase detection voltage, the second driver output phase control voltage increases, and the phase of the channel corresponding to the Ku-band omnidirectional antenna increases; when the first phase detection voltage is less than the second phase detection voltage, the second driver output phase control voltage decreases, and the phase of the channel corresponding to the Ku-band omnidirectional antenna decreases; when the first phase detection voltage is equal to the second phase detection voltage, the second driver output phase control voltage remains unchanged, and the phase of the channel corresponding to the Ku-band omnidirectional antenna remains unchanged.

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