Fast self-adaptive filter circuit device

Abstract

The invention discloses a fast self-adaptive filter circuit device, which belongs to the field of electronics and comprises a main branch and a coupling branch. The main branch comprises an amplitude limiter, a microwave filter, a coupler, a microwave amplifier A, a main branch filter network and a microwave amplifier B; the coupling branch comprises a coupling branch filter network and a detection circuit; the coupling branch filter network is located between the main branch coupler and the detection circuit and is used for screening radio frequency signals in the coupling branch; and the detection circuit is positioned behind the coupling branch filter network, receives the strong signal identified by the coupling branch filter network, outputs the strong signal, converts the strong signal into a detection voltage, compares the detection voltage with a set external threshold voltage, issues a control signal, and distributes the control signal to the main branch filter network in the main branch for filter channel selection. According to the invention, rapid suppression of strong interference signals can be realized, the narrow pulse signal receiving capability is effectively improved, and the adaptability of an ultra-wideband receiver to a complex environment is further improved.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and more specifically, to a fast adaptive filtering circuit device. Background Art

[0002] When the ultra-wideband RF receiver is working, the signal environment is very complex. In addition to the expected received signal, there are also a large number of strong interference signals. There are many useless strong signals from the outside world with different frequencies and powers. The broadband devices used in the ultra-wideband receiver span multiple octaves and cannot achieve high harmonic suppression and high third-order intermodulation, resulting in a large number of harmonics and intermodulation falling into the band, thus affecting the broadband working performance of the RF receiver.

[0003] Traditional RF receiver strong signal suppression link architecture such as Figure 1 As shown in the figure, after the antenna receives the signal, it passes through the RF link channel to the AD signal acquisition and processing end for signal processing. After identifying the strong signal, the front-end attenuator, switch, etc. are controlled through the AGC control, filter control 1, and filter control 2 back-end feedback signals, thereby achieving the effect of strong signal suppression. However, this architecture relies on the back-end AD processor to output the digital signal and then feed it back to the front end. This digital loop control method usually takes more than 500ns, which will lead to large back-end sorting and identification resource overhead and poor real-time performance, and narrow pulse signals within 500ns cannot be received normally. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a fast adaptive filtering circuit device, which effectively improves the agile adaptability to complex electromagnetic environments and greatly reduces the probability of false, missed and erroneous system alarms.

[0005] The object of the present invention is achieved through the following solutions: A fast adaptive filtering circuit device comprises: a main branch and a coupling branch; the main branch comprises a limiter, a microwave filter, a coupler, a microwave amplifier A, a main branch filtering network and a microwave amplifier B connected in sequence; The coupling branch includes a coupling branch filter network and a detection circuit; the coupling branch filter network is located between the coupler and the detection circuit in the main branch, and screens the strong signal of the selected frequency of the radio frequency signal in the coupling branch, and identifies the strong signal existing in the signal; the detection circuit is located after the coupling branch filter network, receives the strong signal output identified by the coupling branch filter network and converts it into a detection voltage, and compares it with the set external threshold voltage. When the set threshold is exceeded, a control signal is sent down, and the control signal is distributed to the main branch filter network in the main branch for filtering channel selection, and the strong signal identified by the coupling branch filter network is filtered out in the main branch.

[0006] Furthermore, the coupling branch filtering network specifically includes a 2-way power divider, and a bandpass filter A and a bandpass filter B respectively connected to the two output ports of the 2-way power divider; the input end of the 2-way power divider is connected to the first output end of the coupler in the main branch; the bandpass filter A and the bandpass filter B are used to filter the useless strong signals of the selected frequency of the radio frequency signal in the coupling branch, and identify the strong interference signals existing in the signal.

[0007] Furthermore, the detection circuit specifically includes: two parallel detection circuits, each detection circuit includes a detector and a comparator connected in sequence, and share an MCU, the other input end of the two comparators inputs an external threshold voltage, the comparator compares the detection voltage output by the detector with the threshold voltage, when the detection voltage exceeds the threshold, a control signal is sent down, and the MCU distributes the control signal to the main branch filter network for filtering channel selection, and the useless strong signal identified by the coupling branch filter network is filtered out in the main branch.

[0008] Further, the main branch filter network includes a 2-to-1 switch A, a high-pass filter, a 2-to-1 switch B, a 2-to-1 switch C, a band-stop filter and a 2-to-1 switch D connected in sequence; the 2-to-1 switch A is connected to the 2-to-1 switch B, the 2-to-1 switch B is connected to the 2-to-1 switch C, the 2-to-1 switch C is connected to the 2-to-1 switch D, and the 2-to-1 switch D is connected to the 2-to-1 switch E; The high-pass filter is arranged between the 2-to-1 switch A and the 2-to-1 switch B, and the band-stop filter is arranged between the 2-to-1 switch C and the 2-to-1 switch D.

[0009] Furthermore, the microwave amplifier B is connected to the output end of the 2-to-1 switch D.

[0010] Furthermore, it comprises a simulation module, and utilizes the simulation module to implement simulation of the adaptive filtering circuit device as described in any one of the above items.

[0011] The beneficial effects of the present invention include: (1) The present invention proposes a new fast adaptive filtering circuit device, which achieves the effect of fast strong signal suppression from the perspective of RF link architecture, thereby expanding the dynamic range of the system, effectively improving the probability of receiving narrow pulse signals, and thus improving the adaptability of the ultra-wideband receiver to complex environments.

[0012] (2) The present invention relies on the front-end RF signal detection to identify the strong signal in the signal and complete the filtering control. The strong signal is filtered out through the main branch filter network in the main branch 1, thereby preventing serious nonlinearity or even channel blocking from causing normal reception, thereby realizing the strong signal suppression function. Compared with the traditional RF circuit, the strong signal suppression capability of the circuit device of the present invention is improved by more than 20dB.

[0013] (3) The present invention achieves a fast response to strong signal suppression within the broadband signal band, with a response time of less than 120ns, which is only 1 / 4 of that of the traditional digital loop control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 Strong signal suppression link architecture for traditional RF receivers; Figure 2 It is a principle block diagram of the fast adaptive filtering circuit device of the present invention; Figure 3 It is a principle block diagram of a fast adaptive filtering circuit device according to an embodiment of the present invention; Figure 4 A link simulation model of a fast adaptive filtering circuit device according to an embodiment of the present invention; Figure 5 This is a simulation comparison chart of the strong signal suppression effect; Figure 6 This is a schematic diagram of the comparison of strong signal suppression response time. DETAILED DESCRIPTION

[0016] All features disclosed in all embodiments in this specification, or steps in all methods or processes implicitly disclosed, except for mutually exclusive features and / or steps, can be combined and / or expanded or replaced in any manner.

[0017] The present invention is conceived to be applied to an ultra-wideband RF receiver. By introducing a filtering network and a high-speed ultra-wideband detection circuit, filtering control is completed by relying on front-end RF signal detection to achieve rapid suppression of strong signals within the broadband signal band, thereby expanding the dynamic range of the system, and external gate limits can be adjusted as needed to meet the suppression requirements of different application scenarios.

[0018] In a preferred embodiment, a fast adaptive filtering circuit device is specifically provided, and the principle block diagram is as follows: Figure 2 As shown, the structural block diagram is as follows Figure 3 As shown, it includes a main branch 1 and a coupling branch 2.

[0019] In the main branch 1, it specifically includes: a limiter, a microwave filter, a coupler, a microwave amplifier A, a 2-to-1 switch A, a high-pass filter, a 2-to-1 switch B, a 2-to-1 switch C, a band-stop filter, a 2-to-1 switch D and a microwave amplifier B connected in sequence.

[0020] The coupling branch 2 specifically includes: a coupling branch filter network 3 and a high-speed ultra-wideband detection circuit 4 .

[0021] In the coupling branch filter network 3, it specifically includes: 2-way power dividers, and bandpass filter A and bandpass filter B respectively connected to the two output ports of the 2-way power dividers. Bandpass filter A and bandpass filter B filter the RF signal in the coupling branch to select the frequency of the useless strong signal and identify the useless strong signal in the signal.

[0022] In the high-speed ultra-wideband detection circuit 4, it specifically includes: two parallel detection circuits, each detection circuit includes a detector and a comparator connected in sequence, the other input end of the two comparators inputs an external threshold voltage, the comparator compares the detection voltage output by the detector with the threshold voltage, and when the detection voltage exceeds the threshold voltage, a control signal is sent down, and the MCU distributes the control signal to 2-to-1 switch A, 2-to-1 switch B, 2-to-1 switch C, and 2-to-1 switch D for filtering channel selection, and filters out useless strong signals identified by the coupling branch filter network 3 through the filter in the main branch, preventing channel blocking and nonlinearity from causing normal reception, and realizing the function of efficient strong signal suppression.

[0023] As a preferred embodiment of the present invention, according to Figure 3 The principle block diagram of the fast adaptive filtering circuit device is established in the simulation software. Figure 4 The simulation model shown.

[0024] As a preferred embodiment of the present invention, Figure 4 As shown, based on the above implementation mode, the high-pass filter in the main branch 1 has an insertion loss of 0.5dB, a cut-off frequency of 2.5GHz, and an out-of-band suppression of >20dB@2.0~2.4GHz; the band-stop filter has an insertion loss of 0.5dB, a stop-band depth of 20dB, and a stop-band frequency of 3.2~3.4GHz; the 2-to-1 switch A / BC / D has an insertion loss of 1.5dB, and a switching time of less than 20ns; the microwave amplifier A / B gain is 12dB; the coupler insertion loss is 0.6dB, and the coupling degree is 15dB.

[0025] As a preferred embodiment of the present invention, Figure 4 As shown, in the coupling branch filter network 3 of the coupling branch 2, the insertion loss of the bandpass filter A is 0.5 dB, and the passband is 2.0~2.4 GHz; the insertion loss of the bandpass filter B is 0.5 dB, and the passband is 3.2~3.4 GHz.

[0026] Figure 5 Given Figure 4The simulation comparison diagram of the suppression effect of the fast adaptive filtering circuit device model of the present invention and the traditional strong signal suppression link shows that in a complex electromagnetic environment, the strong signal suppression of the RF receiver is improved by 20dB.

[0027] Figure 6 Given Figure 4 A schematic diagram comparing the fast adaptive filtering circuit device model of the present invention and the strong signal suppression response time of the traditional strong signal suppression link. The traditional architecture is a digital loop control method, and the strong signal suppression time is greater than 500ns. The circuit device of the present invention relies on the front-end RF signal detection to identify the useless strong signals in the signal, and completes the filtering control. It is filtered out through the filter in the main branch, preventing channel blocking and nonlinearity from causing normal reception. The response time is less than 120ns, which is only 1 / 4 of the traditional architecture.

[0028] It can be seen that the fast adaptive filtering device provided by the present invention effectively improves the ability to quickly adapt to complex electromagnetic environments and greatly reduces the probability of false, missed, and erroneous system alarms.

[0029] The units involved in the embodiments of the present invention may be implemented by software or hardware, and the units described may also be arranged in a processor. The names of these units do not, in some cases, limit the units themselves.

[0030] According to one aspect of an embodiment of the present invention, a computer program product or a computer program is provided, the computer program product or the computer program includes a computer instruction, and the computer instruction is stored in a computer-readable storage medium. A processor of a computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the method provided in the above various optional implementations.

[0031] As another aspect, an embodiment of the present invention further provides a computer-readable medium, which may be included in the electronic device described in the above embodiment; or may exist independently without being assembled into the electronic device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by an electronic device, the electronic device implements the method described in the above embodiment.

Claims

1. A fast adaptive filtering circuit device, characterized in that: include: A main branch and a coupling branch; the main branch comprises a limiter, a microwave filter, a coupler, a microwave amplifier A, a main branch filter network and a microwave amplifier B connected in sequence; The coupling branch includes a coupling branch filter network and a detection circuit; the coupling branch filter network is located between the coupler and the detection circuit in the main branch, and screens the strong signal of the selected frequency of the radio frequency signal in the coupling branch, and identifies the strong signal existing in the signal; the detection circuit is located after the coupling branch filter network, receives the strong signal output identified by the coupling branch filter network and converts it into a detection voltage, and compares it with the set external threshold voltage. When the set threshold is exceeded, a control signal is sent down, and the control signal is distributed to the main branch filter network in the main branch for filtering channel selection, and the strong signal identified by the coupling branch filter network is filtered out in the main branch.

2. The fast adaptive filtering circuit device according to claim 1, characterized in that: The coupling branch filter network specifically includes a 2-way power divider, and a bandpass filter A and a bandpass filter B respectively connected to two output ports of the 2-way power divider; the input end of the 2-way power divider is connected to the first output end of the coupler in the main branch; Bandpass filter A and bandpass filter B are used to filter useless strong signals of selected frequencies in the radio frequency signal in the coupling branch, and to identify strong interfering signals in the signal.

3. The fast adaptive filtering circuit device according to claim 1, characterized in that: The detection circuit specifically includes: two parallel detection circuits, each detection circuit includes a detector and a comparator connected in sequence, and share an MCU, the other input end of the two comparators inputs an external threshold voltage, the comparator compares the detection voltage output by the detector with the threshold voltage, when the detection voltage exceeds the threshold, a control signal is sent down, and the MCU distributes the control signal to the main branch filter network for filtering channel selection, and the useless strong signal identified by the coupling branch filter network is filtered out in the main branch.

4. The fast adaptive filtering circuit device according to claim 3, characterized in that: The main branch filtering network comprises a 2-to-1 switch A, a high-pass filter, a 2-to-1 switch B, a 2-to-1 switch C, a band-stop filter and a 2-to-1 switch D connected in sequence; the 2-to-1 switch A is connected to the 2-to-1 switch B, the 2-to-1 switch B is connected to the 2-to-1 switch C, the 2-to-1 switch C is connected to the 2-to-1 switch D, and the 2-to-1 switch D is connected to the 2-to-1 switch E; The high-pass filter is arranged between the 2-to-1 switch A and the 2-to-1 switch B, and the band-stop filter is arranged between the 2-to-1 switch C and the 2-to-1 switch D.

5. The fast adaptive filtering circuit device according to claim 4, characterized in that: The microwave amplifier B is connected to the output end of the 2-to-1 switch D.

6. The fast adaptive filtering circuit device according to claim 1, characterized in that: It comprises a simulation module, and uses the simulation module to realize the simulation of the adaptive filtering circuit device described in any one of claims 1 to 5.

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