A fast adaptive filtering circuit device

Abstract

The present invention discloses a fast adaptive filtering circuit device, belonging to the field of electronics, which includes a main branch and a coupling branch; the main branch includes a limiter, a microwave filter, a coupler, a microwave amplifier A, a main branch filtering network and a microwave amplifier B; the coupling branch includes a coupling branch filtering network and a detection circuit; the coupling branch filtering network is located between the main branch coupler and the detection circuit to realize signal screening for the radio frequency signal in the coupling branch; the detection circuit is located after the coupling branch filtering network, receives the strong signal output identified by the coupling branch filtering network, converts it into a detection voltage, compares it with the set external threshold voltage, issues a control signal, and distributes the control signal to the main branch filtering network in the main branch for filtering channel selection. The present invention can achieve fast suppression of strong interference signals, effectively improve the reception ability of narrow pulse signals, and further enhance the adaptability of ultra-wideband receivers to complex environments.

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 an ultra-wideband radio frequency receiver is working, the signal environment it is in is very complex. In addition to the expected received signal, there are a large number of strong interference signals. There are many external useless strong signals with different frequencies and powers. The broadband devices used in ultra-wideband receivers cover multiple octaves and cannot achieve high harmonic suppression and high third-order intermodulation, resulting in a large number of harmonics and intermodulations falling into the band, thus affecting the broadband working performance of the radio frequency receiver.

[0003] The strong signal suppression link architecture of traditional radio frequency receivers is as Figure 1 shown. After the antenna receives the signal, it reaches the AD signal acquisition and processing end through the radio frequency link channel 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, so as to achieve the effect of strong signal suppression. However, this architecture relies on the digital signal output by the back-end AD processor and then fed back to the front end. This digital loop control method usually takes more than 500 ns, which will lead to large resource consumption and poor real-time performance of the back-end sorting and identification, and narrow pulse signals within 500 ns cannot be normally received. 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 agility adaptation ability in a complex electromagnetic environment and greatly reduces the probability of false, missed, and wrong alarms in the system.

[0005] The purpose of the present invention is achieved through the following solutions:

[0006] A fast adaptive filtering circuit device includes: a main branch and a coupling branch; the main branch includes a limiter, a microwave filter, a coupler, a microwave amplifier A, a main branch filtering network, and a microwave amplifier B connected in sequence;

[0007] The coupling branch includes a coupling branch filtering network and a detection circuit; the coupling branch filtering network is located between the coupler and the detection circuit in the main branch, screens out strong signals with selected frequencies in the radio frequency signals in the coupling branch, and identifies the strong signals existing in the signals; the detection circuit is located after the coupling branch filtering network, receives the strong signals identified by the coupling branch filtering network, outputs and converts them into detection voltages, compares them with the set external threshold voltage, and when exceeding the set threshold, issues a control signal and distributes the control signal to the main branch filtering network in the main branch for filtering channel selection, and filters out the strong signals identified by the coupling branch filtering network in the main branch.

[0008] Further, the coupling branch filtering network specifically includes a two-way power divider, and a band-pass filter A and a band-pass filter B respectively connected to two output ports of the two-way power divider; the input end of the two-way power divider is connected to the first output end of the coupler in the main branch; the band-pass filter A and the band-pass filter B are used to screen out the useless strong signals of the selected frequency in the radio frequency signals in the coupling branch, and identify the interfering strong signals existing in the signals.

[0009] Further, the detection circuit specifically includes: two parallel detection circuits, each detection circuit includes a detector and a comparator connected in sequence, and shares a single MCU. The other input ends of the two comparators input 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, and the MCU distributes the control signal to the main branch filtering network for filtering channel selection, and filters out the useless strong signals identified by the coupling branch filtering network in the main branch.

[0010] Further, the main branch filtering network includes a 1-of-2 switch A, a high-pass filter, a 1-of-2 switch B, a 1-of-2 switch C, a band-stop filter, and a 1-of-2 switch D connected in sequence; the 1-of-2 switch A is connected to the 1-of-2 switch B, the 1-of-2 switch B is connected to the 1-of-2 switch C, the 1-of-2 switch C is connected to the 1-of-2 switch D, and the 1-of-2 switch D is connected to the 1-of-2 switch E;

[0011] The high-pass filter is arranged between the 1-of-2 switch A and the 1-of-2 switch B, and the band-stop filter is arranged between the 1-of-2 switch C and the 1-of-2 switch D.

[0012] Further, the microwave amplifier B is connected to the output end of the 1-of-2 switch D.

[0013] Further, it includes a simulation module, and the simulation module is used to implement the simulation of the adaptive filtering circuit device described in any one of the above.

[0014] The beneficial effects of the present invention include:

[0015] (1) The present invention proposes a new fast adaptive filtering circuit device, which realizes the effect of fast strong signal suppression from the aspect of the radio frequency link architecture, thereby expanding the dynamic range of the system, effectively improving the receiving probability of narrow pulse signals, and further enhancing the adaptability of the ultra-wideband receiver to complex environments.

[0016] (2) The present invention relies on the front-end radio frequency signal detection to identify strong signals existing in the signals, and completes the filtering control. The strong signals are filtered out through the main branch filtering network in the main branch 1, preventing abnormal reception caused by severe nonlinearity or even channel blockage, and realizing the strong signal suppression function. Compared with the traditional radio frequency circuit, the strong signal suppression ability of the circuit device of the present invention is increased by more than 20 dB.

[0017] (3) The present invention realizes the rapid response to the suppression of strong signals within the bandwidth of broadband signals, with a response time less than 120 ns, which is only 1 / 4 of the traditional digital loopback control method. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is the strong signal suppression link architecture of the traditional radio frequency receiver;

[0020] Figure 2 is the principle block diagram of the fast adaptive filtering circuit device of the present invention;

[0021] Figure 3 is the principle block diagram of the fast adaptive filtering circuit device of the embodiment of the present invention;

[0022] Figure 4 is the link simulation model of the fast adaptive filtering circuit device of the embodiment of the present invention;

[0023] Figure 5 is the simulation comparison diagram of the strong signal suppression effect;

[0024] Figure 6 is the comparison schematic diagram of the strong signal suppression response time. Detailed Embodiments

[0025] All the features disclosed in all the embodiments in this specification, or all the steps in the methods or processes implicitly disclosed, can be combined and / or extended, replaced in any way, except for the mutually exclusive features and / or steps.

[0026] In the concept of the present invention, it is applied to an ultra-wideband radio frequency receiver. By introducing a filtering network and a high-speed ultra-wideband detection circuit, the filtering control is completed relying on the front-end radio frequency signal detection, realizing the rapid suppression of strong signals within the bandwidth of broadband signals, thereby expanding the dynamic range of the system, and the external threshold can be adjusted according to requirements to meet the suppression requirements of different application scenarios.

[0027] In a preferred embodiment, a fast adaptive filtering circuit device is specifically provided. The principle block diagram is as Figure 2 shown, and the structural block diagram is as Figure 3 shown, including a main branch 1 and a coupling branch 2.

[0028] In the main branch 1, it specifically includes: a limiter, a microwave filter, a coupler, a microwave amplifier A, a 1-of-2 switch A, a high-pass filter, a 1-of-2 switch B, a 1-of-2 switch C, a band-stop filter, a 1-of-2 switch D, and a microwave amplifier B, which are connected in sequence.

[0029] In the coupling branch 2, it specifically includes: a coupling branch filtering network 3 and a high-speed ultra-wideband detection circuit 4.

[0030] In the coupling branch filtering network 3, it specifically includes: a 2-way power divider, and a band-pass filter A and a band-pass filter B respectively connected to two output ports of the 2-way power divider. The band-pass filter A and the band-pass filter B perform signal screening on the radio frequency signals in the coupling branch to identify the useless strong signals existing in the signals.

[0031] 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 terminal 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 voltage, a control signal is sent to the MCU, and the MCU distributes the control signal to the 1-of-2 switch A, the 1-of-2 switch B, the 1-of-2 switch C, and the 1-of-2 switch D for filtering channel selection, and filters out the useless strong signals identified by the coupling branch filtering network 3 through the filters in the main branch, preventing channel blockage and non-linearity from causing abnormal reception and realizing the function of efficient strong signal suppression.

[0032] As a preferred embodiment of the present invention, based on the principle block diagram of the fast adaptive filtering circuit device of Figure 3 , a simulation model as Figure 4 shown is established in the simulation software.

[0033] As a preferred embodiment of the present invention, as Figure 4 shown, on the basis of the above embodiment, the insertion loss of the high-pass filter in the main branch 1 is 0.5 dB, the cut-off frequency is 2.5 GHz, and the out-of-band rejection is > 20 dB @ 2.0 - 2.4 GHz; the insertion loss of the band-stop filter is 0.5 dB, the stopband depth is 20 dB, and the stopband frequency is 3.2 - 3.4 GHz; the insertion loss of the 1-of-2 switch A / BC / D is 1.5 dB, and the switching time is less than 20 ns; the gain of the microwave amplifier A / B is 12 dB; the insertion loss of the coupler is 0.6 dB, and the coupling degree is 15 dB.

[0034] As a preferred embodiment of the present invention, as Figure 4 shown, in the coupling branch filter network 3 of the coupling branch 2, the insertion loss of the band-pass filter A is 0.5 dB, and the passband is 2.0 - 2.4 GHz; the insertion loss of the band-pass filter B is 0.5 dB, and the passband is 3.2 - 3.4 GHz.

[0035] Figure 5 gives Figure 4 the simulation comparison diagram of the suppression effect between the fast adaptive filter circuit device model of the present invention and the traditional strong signal suppression link. It can be seen that in a complex electromagnetic environment, the strong signal suppression of the RF receiver is improved by 20 dB.

[0036] Figure 6 gives Figure 4 the comparison schematic diagram of the strong signal suppression response time between the fast adaptive filter circuit device model of the present invention and the traditional strong signal suppression link. The traditional architecture is a digital loop control method, and the strong signal suppression time is greater than 500 ns. While the circuit device of the present invention relies on the front-end RF signal detection to identify the useless strong signals existing in the signal, and completes the filtering control, and filters them through the filter in the main branch, preventing channel blockage and non-linearity from causing abnormal reception. The response time is less than 120 ns, only 1 / 4 of the traditional architecture.

[0037] Thus, it can be seen that a fast adaptive filter device provided by the present invention effectively improves the agility adaptation ability in a complex electromagnetic environment, and greatly reduces the probabilities of false, missed, and wrong alarms of the system.

[0038] The units involved in the embodiments described in the present invention can be implemented in software or in hardware, and the described units can also be provided in a processor. Among them, the names of these units do not constitute a limitation to the unit itself in some cases.

[0039] According to one aspect of the embodiments of the present invention, there is provided a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the methods provided in the above various alternative implementation manners.

[0040] As another aspect, an embodiment of the present invention further provides a computer-readable medium. This computer-readable medium may be included in the electronic device described in the above embodiments; or it may exist alone without being assembled into the electronic device. The above computer-readable medium carries one or more programs. When the above one or more programs are executed by an electronic device, the electronic device implements the method described in the above embodiments.

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 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; 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.

2. 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.

3. The fast adaptive filtering circuit device according to claim 2, 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.

4. The fast adaptive filtering circuit device according to claim 3, characterized in that: The microwave amplifier B is connected to the output end of the 2-to-1 switch D.

5. The fast adaptive filtering circuit device according to claim 1, characterized in that: It includes a simulation module, and uses the simulation module to realize the simulation of the adaptive filtering circuit device.

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