CN114362701A - Method and system for filtering stray signals and local oscillator signals - Google Patents
Method and system for filtering stray signals and local oscillator signals Download PDFInfo
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Abstract
The invention discloses a method and a system for filtering stray signals and local oscillator signals, wherein the method for filtering the stray signals and the local oscillator signals comprises the steps of collecting radar radiation signals by using a sampling module, processing the radar radiation signals and sending the radar radiation signals to a frequency mixing module; the signal output by the sampling module is subjected to frequency mixing and amplification through a frequency mixing module to obtain a signal A; the local oscillation signals and the stray signals in the signal A are suppressed through a filtering module so as to filter the stray signals and the local oscillation signals; according to the invention, by designing the frequency mixing module and the filtering module and introducing the T-shaped network, the local oscillation signals and the stray signals are effectively filtered.
Description
Technical Field
The invention relates to the technical field of signal filtering, in particular to a method and a system for filtering stray signals and local oscillator signals.
Background
Frequency conversion is often involved in the process of transceiving radio signals. In addition to the desired output signal, many unwanted signals, i.e., spurious signals and local oscillator signals, are inevitably generated during the frequency conversion process. These signals interfere with the processing of the desired signal by subsequent circuitry.
The prior art mostly adopts analog filter to filter, but can only filter some spurious signals, unable filtering local oscillator signal, and when spurious signal mixes in the output frequency band, unable passing filter filters.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
In order to solve the technical problems, the invention provides the following technical scheme: the method comprises the steps of collecting radar radiation signals by using a sampling module, processing the radar radiation signals and sending the radar radiation signals to a frequency mixing module; the signal output by the sampling module is subjected to frequency mixing and amplification through a frequency mixing module to obtain a signal A; local oscillator signals and spurious signals in the signal A are suppressed through the filtering module, and therefore the spurious signals and the local oscillator signals are filtered.
As a preferred scheme of the filtering method for the spurious signals and the local oscillator signals, the method comprises the following steps: the sampling module comprises an antenna and a processing unit; receiving radar radiation signals through an antenna and sending the radar radiation signals to a processing unit; the radar radiation signals are measured through the processing unit, PDW parameters are obtained, the radar radiation signals are subjected to speed reduction and serial-parallel conversion, and PDW pulses are generated by combining the PDW parameters.
As a preferred scheme of the filtering method for the spurious signals and the local oscillator signals, the method comprises the following steps: the frequency mixing module comprises a frequency conversion component, an amplifier and a phase locking circuit; the PDW pulse is mixed with a signal provided by a frequency source component through a frequency conversion component, and then the mixed signal is amplified through an amplifier; and performing power conversion on the signal output by the amplifier by using a phase-locked circuit to obtain a signal A.
As a preferred scheme of the filtering method for the spurious signals and the local oscillator signals, the method comprises the following steps: the phase-locked circuit consists of a crystal oscillator and three phase-locked PDROs, wherein the working frequencies of the three phase-locked PDROs are respectively 10.2GHz, 11.9GHz and 13GHz, and the output power of each path is more than or equal to 3 dBm.
As a preferred scheme of the filtering method for the spurious signals and the local oscillator signals, the method comprises the following steps: the filtering module comprises a duplexer, a diode and a filter; separating the local oscillation signal and the stray signal in the signal A by using a duplexer; the local oscillation signals and the stray signals in the signal A are suppressed through the filter, and corresponding loops are formed for all the signals, so that the stray signals and the local oscillation signals are filtered.
As a preferred scheme of the filtering method for the spurious signals and the local oscillator signals, the method comprises the following steps: the filter is designed based on a fin line filter, open lines are connected to two sides of the filter, and a metal strip area of the filter can be equivalent to a T-shaped network consisting of inductive elements; the design of the impedance transformer in the filter is completed by arranging a section of transmission line with characteristic impedance Z0 and electrical length lambda/2 on two sides of the T-shaped network.
As a preferred scheme of the filtering system for the spurious signals and the local oscillator signals, the filtering system comprises: the device comprises a sampling module, a frequency mixing module and a frequency conversion module, wherein the sampling module is used for collecting signals and sending the signals to the frequency mixing module; the frequency mixing module is connected with the sampling module and used for carrying out frequency mixing and amplification on local oscillation signals in the signals to obtain a signal A; and the filtering module is connected with the frequency mixing module and used for suppressing the local oscillation signals and the stray signals in the signal A so as to filter the stray signals and the local oscillation signals.
As a preferred scheme of the filtering system for the spurious signals and the local oscillator signals, the filtering system comprises: the sampling module comprises an antenna and a processing unit; the antenna is used for receiving the radar radiation signals and sending the radar radiation signals to the processing unit; and the processing unit is connected with the antenna and used for measuring the radar radiation signal to obtain a PDW parameter, performing speed reduction and serial-parallel conversion processing on the radar radiation signal, and generating a PDW pulse by combining the PDW parameter.
As a preferred scheme of the filtering system for the spurious signals and the local oscillator signals, the filtering system comprises: the frequency mixing module comprises a frequency conversion component, an amplifier and a phase locking circuit; the frequency conversion component is used for mixing the PDW pulse with a signal provided by the frequency source component; the amplifier is connected with the frequency conversion component and used for amplifying the mixed signals; the phase-locked circuit is connected with the amplifier and used for performing power conversion on the signal output by the amplifier to obtain a signal A; the phase-locked circuit consists of a crystal oscillator and three phase-locked PDROs, wherein the working frequencies of the three phase-locked PDROs are respectively 10.2GHz, 11.9GHz and 13GHz, and the output power of each path is more than or equal to 3 dBm.
As a preferred scheme of the filtering system for the spurious signals and the local oscillator signals, the filtering system comprises: the filtering module comprises a duplexer, a diode and a filter; the duplexer is used for separating local oscillation signals and stray signals in the signal A; the diode is connected with the duplexer and used for conducting and cutting off; and the filter is connected with the diode and is used for inhibiting the local oscillation signals and the stray signals in the signal A and forming corresponding loops for each signal so as to filter the stray signals and the local oscillation signals.
The invention has the beneficial effects that: according to the invention, by designing the frequency mixing module and the filtering module and introducing the T-shaped network, the local oscillation signals and the stray signals are effectively filtered.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic structural diagram of a filter 303 for a method for filtering a spurious signal and a local oscillator signal according to a first embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a test result of a frequency mixing module 200 according to a method for filtering a spurious signal and a local oscillator signal according to a first embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a signal filtering effect of a filtering method for spurious signals and local oscillator signals according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a system for filtering spurious signals and local oscillator signals according to a second embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" 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.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1 to 3, a first embodiment of the present invention provides a method for filtering a spurious signal and a local oscillator signal, including:
s1: the sampling module 100 is used to collect radar radiation signals, process the radar radiation signals, and send the radar radiation signals to the frequency mixing module 200.
The sampling module 100 comprises an antenna 101 and a processing unit 102;
(1) receiving a radar radiation signal through an antenna 101, and sending the radar radiation signal to a processing unit 102;
the parameters of the antenna 101 in this embodiment are:
frequency: 92-95 GHz, beam width: > 15 degrees, gain: > 10dB, standing wave: is less than 2.5.
(2) The processing unit 102 measures the radar radiation signal to obtain a PDW parameter, performs speed reduction and serial-parallel conversion processing on the radar radiation signal, and generates a PDW pulse by combining the PDW parameter.
After speed reduction and serial-parallel conversion processing, FFT calculation is carried out by combining PDW parameters, and spectral peak search is carried out on the calculated result to generate PDW pulse.
S2: the signal output by the sampling module 100 is mixed and amplified by the mixing module 200 to obtain a signal a.
The frequency mixing module 200 comprises a frequency conversion component 201, an amplifier 202 and a phase locking circuit 203;
(1) the PDW pulse is mixed with a signal provided by a frequency source component through a frequency conversion component 201;
the frequency conversion component 201 mainly comprises a band-pass filter, a frequency mixer and the like, and PDW pulses are subjected to frequency mixing with local oscillation signals provided by a frequency source component after passing through the 57-64 GHz band-pass filter.
(2) Amplifying the mixed signal by an amplifier 202;
(3) the signal output from the amplifier 202 is power-converted by the phase lock circuit 203 to obtain a signal a.
The phase-locked circuit 203 is composed of a crystal oscillator and three phase-locked PDROs, wherein the working frequencies of the three phase-locked PDROs are respectively 10.2GHz, 11.9GHz and 13GHz, and the output power of each path is more than or equal to 3 dBm.
S3: the local oscillator signal and the intermediate frequency signal in the signal a are suppressed by the filtering module 300 to filter out the spurious signal and the local oscillator signal.
The filtering module 300 includes a duplexer 301, a diode 302, and a filter 303;
(1) the local oscillation signal and the intermediate frequency signal in the signal a are separated by the duplexer 301, and the radio frequency signal can be prevented from leaking to the local oscillation port.
(2) The local oscillator signal and the intermediate frequency signal in the signal a are suppressed by the filter 303, and a corresponding loop is formed for each signal, so that the spurious signal and the local oscillator signal are filtered.
The filter is one of important devices forming a signal source, in order to effectively filter stray signals and local oscillation signals and improve out-of-band rejection performance, in this embodiment, the filter 303 is designed based on a fin line filter, referring to fig. 1, open lines are connected to two sides of the filter 303, and a metal strip area of the filter can be equivalent to a T-type network formed by inductive elements; the transmission matrix a of the T-type network is represented by:
where j is the imaginary part, Xs、XpIs an inductor.
Further, the design of the impedance transformer in the filter 303 is completed by providing a transmission line with characteristic impedance Z0 and electrical length λ/2 to both sides of the T-network.
Preferably, the filter 303 designed in this embodiment has a simple structure, low loss, and satisfactory performance.
In order to verify and explain the technical effects adopted in the method, the simulation test is performed in a scientific demonstration manner in the embodiment to verify the real effects of the method, circuit building and simulation are performed through Multisim, the filtering effect of the frequency mixing module 200 and the method on the interference signals is simulated respectively, and the obtained simulation results are shown in fig. 2 and 3.
Fig. 2 shows the test result of the frequency mixing module 200, and it can be seen from the figure that when the local oscillator is 80.6GHz, the intermediate frequency is 8-18GHz, which can meet the requirement.
Fig. 3 is a schematic diagram of a signal filtering effect obtained by the method, and it can be seen that the method can effectively filter stray signals and local oscillator signals.
Example 2
Referring to fig. 4, a second embodiment of the present invention, which is different from the first embodiment, provides a spurious signal and local oscillator signal filtering system, including,
the sampling module 100 is configured to collect a signal and send the signal to the frequency mixing module 200; the sampling module 100 comprises an antenna 101 and a processing unit 102; the antenna 101 is used for receiving the radar radiation signal and sending the radar radiation signal to the processing unit 102; and the processing unit 102 is connected with the antenna 101, and is configured to measure the radar radiation signal, obtain a PDW parameter, perform speed reduction and serial-parallel conversion processing on the radar radiation signal, and generate a PDW pulse by combining the PDW parameter.
The frequency mixing module 200 is connected to the sampling module 100, and is configured to perform frequency mixing and amplification on a local oscillator signal in the signal to obtain a signal a; the frequency mixing module 200 comprises a frequency conversion component 201, an amplifier 202 and a phase locking circuit 203; a frequency conversion component 201, configured to mix the PDW pulse with a signal provided by the frequency source component; the amplifier 202 is connected with the frequency conversion component 201 and is used for amplifying the mixed signals; the phase-locked circuit 203 is connected with the amplifier 202 and is used for performing power conversion on the signal output by the amplifier 202 to obtain a signal A; the phase-locked circuit 203 is composed of a crystal oscillator and three phase-locked PDROs, wherein the working frequencies of the three phase-locked PDROs are respectively 10.2GHz, 11.9GHz and 13GHz, and the output power of each path is more than or equal to 3 dBm.
And the filtering module 300 is connected to the frequency mixing module 200, and is configured to suppress the local oscillator and the intermediate frequency in the signal a to filter out the spurious signal and the local oscillator signal. The filtering module 300 includes a duplexer 301, a diode 302, and a filter 303; a duplexer 301, configured to separate a local oscillation signal and an intermediate frequency signal in the signal a; a diode 302 connected to the duplexer 301 for conduction and cut-off; and the filter 303 is connected to the diode 302, and is configured to suppress the local oscillator signal and the intermediate frequency signal in the signal a, and form a corresponding loop for each signal, so as to filter out the spurious signal and the local oscillator signal.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein. A computer program can be applied to input data to perform the functions described herein to transform the input data to generate output data that is stored to non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on a display.
As used in this application, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being: a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of example, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A method for filtering stray signals and local oscillator signals is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
collecting radar radiation signals by using a sampling module (100), processing the radar radiation signals, and sending the radar radiation signals to a frequency mixing module (200);
mixing and amplifying the signals output by the sampling module (100) through a mixing module (200) to obtain a signal A;
the local oscillation signals and the spurious signals in the signal A are suppressed through a filtering module (300) so as to filter the spurious signals and the local oscillation signals.
2. The method of claim 1, wherein the method further comprises: the sampling module (100) comprises an antenna (101) and a processing unit (102);
receiving radar radiation signals through an antenna (101) and sending the radar radiation signals to a processing unit (102);
the radar radiation signals are measured through the processing unit (102), PDW parameters are obtained, the radar radiation signals are subjected to speed reduction and serial-parallel conversion, and PDW pulses are generated by combining the PDW parameters.
3. The method of claim 2, wherein the method further comprises: the frequency mixing module (200) comprises a frequency conversion component (201), an amplifier (202) and a phase locking circuit (203);
PDW pulses are mixed with signals provided by a frequency source component through a frequency conversion component (201), and then the signals are amplified through an amplifier (202);
the signal output by the amplifier (202) is power-converted by a phase-locked circuit (203) to obtain a signal A.
4. A method as claimed in claim 3, wherein the method further comprises: the phase-locked circuit (203) consists of a crystal oscillator and three phase-locked PDROs, wherein the working frequencies of the three phase-locked PDROs are respectively 10.2GHz, 11.9GHz and 13GHz, and the output power of each path is more than or equal to 3 dBm.
5. A method as claimed in claim 3 or 4, for filtering spurious signals and local oscillator signals, characterized by: the filtering module (300) comprises a duplexer (301), a diode (302) and a filter (303);
separating the local oscillator signal and the stray signal in the signal A by using a duplexer (301);
local oscillation signals and stray signals in the signals A are suppressed through the filter (303), and corresponding loops are formed for the signals, so that the stray signals and the local oscillation signals are filtered.
6. The method of claim 5, wherein the method further comprises: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
designing a filter (303) based on a fin line filter, wherein open lines are connected to two sides of the filter (303), and a metal strip area of the filter (303) can be equivalent to a T-shaped network consisting of inductive elements;
the design of the impedance transformer in the filter (303) is completed by arranging a transmission line with characteristic impedance Z0 and electrical length lambda/2 on both sides of the T-type network.
7. The utility model provides a spurious signal and local oscillator signal's filtering system which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the sampling module (100) is used for collecting signals and sending the signals to the frequency mixing module (200);
the frequency mixing module (200) is connected with the sampling module (100) and is used for mixing and amplifying local oscillation signals in the signals to obtain a signal A;
and the filtering module (300) is connected with the frequency mixing module (200) and is used for suppressing the local oscillation signals and the spurious signals in the signal A so as to filter the spurious signals and the local oscillation signals.
8. A spurious signal and local oscillator signal filtering system as defined in claim 7, wherein: the sampling module (100) comprises an antenna (101) and a processing unit (102);
the antenna (101) is used for receiving the radar radiation signals and sending the radar radiation signals to the processing unit (102);
and the processing unit (102) is connected with the antenna (101) and is used for measuring the radar radiation signal to obtain a PDW parameter, performing speed reduction and serial-parallel conversion processing on the radar radiation signal, and generating a PDW pulse by combining the PDW parameter.
9. A system for filtering spurious and local oscillator signals as defined in claim 7 or 8, wherein: the frequency mixing module (200) comprises a frequency conversion component (201), an amplifier (202) and a phase locking circuit (203);
the frequency conversion component (201) is used for mixing the PDW pulse with a signal provided by the frequency source component;
the amplifier (202) is connected with the frequency conversion component (201) and is used for amplifying the mixed signals;
the phase-locked circuit (203) is connected with the amplifier (202) and is used for performing power conversion on the signal output by the amplifier (202) to obtain a signal A; the phase-locked circuit (203) consists of a crystal oscillator and three phase-locked PDROs, wherein the working frequencies of the three phase-locked PDROs are respectively 10.2GHz, 11.9GHz and 13GHz, and the output power of each path is more than or equal to 3 dBm.
10. A spurious signal and local oscillator signal filtering system as defined in claim 9, wherein: the filtering module (300) comprises a duplexer (301), a diode (302) and a filter (303);
the duplexer (301) is used for separating local oscillation signals and stray signals in the signal A;
a diode (302) connected to the diplexer (301) for conduction and cut-off;
and the filter (303) is connected with the diode (302) and is used for inhibiting the local oscillation signals and the stray signals in the signals A and forming corresponding loops for the signals so as to filter the stray signals and the local oscillation signals.
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| CN202111577378.4A CN114362701B (en) | 2021-12-22 | 2021-12-22 | Method and system for filtering stray signals and local oscillator signals |
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| CN202111577378.4A CN114362701B (en) | 2021-12-22 | 2021-12-22 | Method and system for filtering stray signals and local oscillator signals |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104201991A (en) * | 2014-09-10 | 2014-12-10 | 四川九洲电器集团有限责任公司 | Digital down-converting system for implementing frequency-agility metrewave radar |
| CN107132585A (en) * | 2017-03-30 | 2017-09-05 | 北京金石智信科技有限公司 | The monitoring system of radar system and airfield runway foreign matter |
| CN110988830A (en) * | 2020-01-03 | 2020-04-10 | 零八一电子集团有限公司 | Multi-frequency-band radar target simulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104201991A (en) * | 2014-09-10 | 2014-12-10 | 四川九洲电器集团有限责任公司 | Digital down-converting system for implementing frequency-agility metrewave radar |
| CN107132585A (en) * | 2017-03-30 | 2017-09-05 | 北京金石智信科技有限公司 | The monitoring system of radar system and airfield runway foreign matter |
| CN110988830A (en) * | 2020-01-03 | 2020-04-10 | 零八一电子集团有限公司 | Multi-frequency-band radar target simulator |
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