CN111398919A - Electromagnetic scattering test link system and method for inhibiting video leakage interference - Google Patents
Electromagnetic scattering test link system and method for inhibiting video leakage interference Download PDFInfo
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- CN111398919A CN111398919A CN202010202623.2A CN202010202623A CN111398919A CN 111398919 A CN111398919 A CN 111398919A CN 202010202623 A CN202010202623 A CN 202010202623A CN 111398919 A CN111398919 A CN 111398919A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
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Abstract
The invention relates to an electromagnetic scattering test link system and a method for inhibiting video leakage interference, wherein the test link system comprises: the device comprises a first coherent signal source, a second coherent signal source, a transmitting frequency mixing unit, a receiving frequency mixing unit, a reference frequency mixing unit, a transmitting feed source, a receiving unit, a receiving feed source, a reference receiver and a test receiver; the first coherent signal source and the second coherent signal source are respectively used for generating a radio frequency test signal and a local oscillator signal; and the radio frequency test signal generated by the first coherent signal source is subjected to hardware gate on-off modulation by the transmitting frequency mixing unit and is mixed with the local oscillator signal to form an intermediate frequency signal. The test link system of the invention adopts a frequency conversion mode, realizes the inhibition of video leakage interference from hardware, and avoids the errors caused by frequency deviation and interpolation in the traditional mode, thereby avoiding the video leakage interference introduced by a hardware gate while utilizing the hardware gate to inhibit the environmental interference.
Description
Technical Field
The invention relates to the technical field of microwave testing, in particular to an electromagnetic scattering testing link system and a method for inhibiting video leakage interference.
Background
In a low-frequency electromagnetic scattering/radiation test that adopts a hardware gate technology to perform spatial filtering, a clock control signal of a high-speed switch in a hardware gate leaks to a test link, and interference is caused on the test signal, which is called video leakage interference.
In the hardware gate technology, the test signal of the antenna to be tested can fall into the receiving pulse passband range by adjusting the pulse width transmitted/received by the hardware gate, the time delay and the repetition period between the transmitted/received pulses, so that a normal test signal is obtained, the echo signal passing through the environmental interference falls out of the receiving pulse passband range, the filtering effect on the environmental interference signal is realized, and the influence of the environmental interference signal on the test result is reduced.
The high-speed switch in the hardware gate is used for generating pulses, and controlling the level signal of the high-speed switch to be coupled into the test link to become an interference signal, wherein the interference frequency is the repetition period frequency of the level signal and the harmonic frequencies of the level signal. Video leakage interference signals generally range from a level signal repetition period frequency (generally, a few megahertz frequency) to about 1GHz, and the signal level is high, so that serious interference is caused to the test; for weak/small signal testing, the interference can be about 6GHz generally.
At present, there are two main ways to suppress video leakage interference. One of the methods is to avoid interfered frequency points during testing and replace the interfered frequency points with the testing results of adjacent frequency points, which cannot obtain the data of the required frequency points; in another mode, interfered frequency point data in the result data obtained by testing is removed, interpolation calculation is carried out by using adjacent result data to obtain the interfered frequency point data, although the test result data has certain continuity along with frequency change, approximate data of an interfered frequency point can be obtained through an interpolation algorithm, but if the test result has larger fluctuation along with the frequency change, the error of the approximate result is larger.
Therefore, in view of the above disadvantages, it is desirable to provide a test link system and method for suppressing video leakage interference.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a test link system and method for suppressing video leakage interference, aiming at the defects in the prior art.
In order to solve the above technical problem, the present invention provides an electromagnetic scattering test link system: the method comprises the following steps: the device comprises a first coherent signal source, a second coherent signal source, a transmitting frequency mixing unit, a receiving frequency mixing unit, a reference frequency mixing unit, a transmitting feed source, a receiving unit, a receiving feed source, a reference receiver and a test receiver;
the first coherent signal source and the second coherent signal source are respectively used for generating a radio frequency test signal and a local oscillator signal; the radio frequency test signal generated by the first coherent signal source is subjected to hardware gate on-off modulation by the transmitting frequency mixing unit and is mixed with the local oscillator signal to form an intermediate frequency signal;
the intermediate frequency signal is divided into an intermediate frequency test signal and an intermediate frequency reference signal after passing through the transmitting unit, wherein the intermediate frequency test signal is connected with a transmitting feed source and is transmitted as a test signal, and the intermediate frequency reference signal is mixed with a local oscillator signal through a reference mixing unit and is filtered to remove harmonic interference signals to form a radio frequency reference signal and is transmitted to a reference receiver;
the receiving feed source receives a test signal, the test signal passes through the receiving unit, then is accessed into the receiving frequency mixing unit to be mixed with a local oscillator signal, and then is gated by a hardware gate and forms a radio frequency test signal after filtering a harmonic interference signal to be sent to the test receiver; and the radio frequency reference signal received by the reference receiver and the radio frequency test signal received by the test receiver are used for obtaining an electromagnetic scattering test result.
Preferably, the transmit mixing unit includes: a first hardware gate switch and a first mixer;
the first hardware gate switch is connected with the first coherent signal source and is used for on-off modulation of an input radio frequency test signal;
the first frequency mixer is connected with the second coherent signal source and the first hardware door switch and used for mixing the radio frequency test signal subjected to on-off modulation of the hardware door with the local oscillator signal to form an intermediate frequency signal and filtering out a video leakage interference signal by setting the output frequency range of the first frequency mixer.
Preferably, the transmitting unit includes: a first power amplifier and a directional coupler;
the first power amplifier is connected with the first mixer and is used for amplifying the power of the received intermediate frequency signal; the directional coupler is connected with the first power amplifier, the transmitting feed source and the reference mixing unit, and divides the intermediate frequency signal passing through the first power amplifier into an intermediate frequency test signal and an intermediate frequency reference signal.
Preferably, the reference mixing unit includes: a third mixer and a third filter;
the third mixer is connected with the directional coupler and is used for mixing the intermediate frequency reference signal with the local oscillator signal to obtain a radio frequency reference signal and a harmonic interference signal;
and the third filter is connected with the third mixer and the reference receiver and is used for filtering harmonic interference signals and sending the radio frequency reference signals to the reference receiver.
Preferably, the receiving unit includes a first low noise amplifier; the first low noise amplifier is connected with the receiving feed source and the receiving mixing unit and used for forming an intermediate frequency test signal according to the test signal received by the receiving feed source.
Preferably, the reception mixing unit includes: a second mixer, a second hardware gate switch, and a second filter;
the second mixer is connected with the first low-noise amplifier and the second hardware gate switch and is used for mixing the intermediate-frequency test signal with the local oscillator signal to obtain a radio-frequency test signal and a harmonic interference signal;
and the second filter is connected with the second hardware door switch and the test receiver and is used for filtering harmonic interference signals and sending the radio frequency test signals to the test receiver.
Preferably, the method further comprises the following steps: a power divider; the power divider is connected with the second coherent signal source, the transmitting frequency mixing unit, the reference frequency mixing unit and the receiving frequency mixing unit and is used for equally dividing the local oscillation signal power generated by the second coherent signal source into three parts for output.
The invention also provides a method for inhibiting video leakage interference in the electromagnetic scattering test, which comprises the following steps:
carrying out hardware gate on-off modulation on the radio frequency test signal and mixing the radio frequency test signal with a local oscillator signal to form an intermediate frequency signal;
dividing the intermediate frequency signal into an intermediate frequency test signal and an intermediate frequency reference signal, wherein the intermediate frequency test signal is transmitted as a test signal, and the intermediate frequency reference signal is mixed with a local oscillator signal and a radio frequency reference signal is obtained after a harmonic interference signal is filtered;
after receiving an intermediate frequency test signal in an echo of a target to be tested, mixing the intermediate frequency test signal with a local oscillator signal, gating a hardware gate and filtering a harmonic interference signal to obtain a radio frequency test signal;
and obtaining an electromagnetic scattering test result by using the radio frequency reference signal and the radio frequency test signal obtained by the receiving end.
Preferably, the performing hardware gate on-off modulation on the radio frequency test signal and mixing the radio frequency test signal with the local oscillator signal to form an intermediate frequency signal specifically includes:
carrying out hardware gate on-off modulation on the radio frequency test signal;
and mixing the radio frequency test signal subjected to on-off modulation of the hardware gate with the local oscillator signal to form an intermediate frequency signal, and filtering out a video leakage interference signal by setting the output frequency range of the first frequency mixer.
Preferably, the method further comprises: the power of the local oscillator signal is equally divided into three parts by a power divider.
The electromagnetic scattering test link system and the method for inhibiting the video leakage interference in the electromagnetic scattering test have the following beneficial effects: the test link system constructed by the invention can effectively inhibit video leakage interference in a low-frequency electromagnetic scattering/radiation test which adopts a hardware gate technology to carry out spatial filtering, and can not introduce the problems of frequency offset and interpolation-induced errors caused by the existing interference inhibition mode, thereby realizing the purpose of not introducing video leakage interference while utilizing the hardware gate technology to carry out test environment interference inhibition.
Drawings
FIG. 1 is a schematic diagram of a hardware gate technology;
FIG. 2 is a video leakage interference histogram of a P-band radar;
FIG. 3 is a schematic structural diagram of an electromagnetic scattering test link system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electromagnetic scattering test link system according to a second embodiment of the present invention.
In the figure: 1: a first coherent signal source; 2: a second coherent signal source; 3: a transmit mixing unit; 4: a receiving and mixing unit; 5: a reference mixing unit; 6: a transmitting unit; :7: transmitting a feed source; 8: a receiving unit; 9: receiving a feed source; 10: a reference receiver; 11: testing the receiver; 12: a power divider; 31: a first hardware door switch; 32: a first mixer; 41: a second mixer; 42: a second hardware door switch; 43: a second filter; 51: a third mixer; 52: a third filter; 61: a directional coupler; 62: a first power amplifier; 81: a first low noise amplifier.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The implementation principle of the hardware gate technology will be briefly explained first.
The hardware gate technology is a technical method for modulating a test signal by a signal transmitting end in a pulse mode, carrying out gating adjustment on a receiving end in a pulse time delay mode, and realizing a filtering effect in a space by adjusting the time delay between a transmitting pulse and a receiving pulse so as to reduce the influence of environmental clutter on measurement. With particular reference to figure 1.
As the clock control signal for controlling the hardware gate switch is coupled into the test link, interference to the test signal, i.e. video leakage interference, is caused, and as shown in fig. 2, the arrow indicates the frequency distribution of the video leakage interference signal when the radar operates in the P-band.
The following embodiment specifically describes the test link system for suppressing video leakage interference according to the present invention.
Example one
As shown in fig. 3, a first embodiment of the present invention provides an electromagnetic scattering test link system, including: the device comprises a first coherent signal source 1, a second coherent signal source 2, a transmitting mixing unit 3, a receiving mixing unit 4, a reference mixing unit 5, a transmitting unit 6, a transmitting feed source 7, a receiving unit 8, a receiving feed source 9, a reference receiver 10 and a test receiver 11. The test link system also includes power matching equipment and a mating connection cable.
The principle of the invention for inhibiting the video leakage interference is that the video leakage frequency is arranged outside the output frequency range of the transmitting mixing unit through frequency change, and then filtering processing is carried out to filter the video leakage interference, thereby realizing the purpose of inhibiting the video leakage interference.
The first coherent signal source 1 generates a radio frequency test signal and inputs the radio frequency test signal into the transmitting mixing unit 3. The second coherent signal source 2 generates local oscillation signals, and the local oscillation signals are respectively input to the transmitting frequency mixing unit 3, the receiving frequency mixing unit 4 and the reference frequency mixing unit 5 for frequency mixing. The first coherent signal source 1 and the second coherent signal source 2 in the invention can adopt equipment which can generate test signals, such as a vector network analyzer, and the like, wherein the radio frequency test signal and the local oscillator signal are related to the test frequency of the target to be tested, and are specifically set according to the test frequency of the target to be tested. In a specific embodiment, the difference frequency between the radio frequency test signal frequency and the local oscillator signal frequency is the test frequency of the target to be tested.
The transmitting and mixing unit 3 performs hardware gate on-off modulation on the received radio frequency test signal, and then performs mixing with the local oscillation signal to form intermediate frequency signal output.
Because the clock control signal for controlling the hardware door switch and the harmonic wave thereof are coupled into the test link, the radio frequency test signal is added with a video leakage interference signal after being modulated by the on-off of the hardware door. The radio frequency test signal and the additional video leakage interference signal after on-off modulation by the hardware gate are respectively mixed with the local oscillator signal by the transmitting and mixing unit 3. The radio frequency test signal and the local oscillator signal are mixed to obtain an intermediate frequency signal with lower frequency and output the intermediate frequency signal, and the frequency of the interference signal obtained by mixing the additional video leakage interference signal and the local oscillator signal is not in the intermediate frequency output frequency range of the transmitting and mixing unit 3, so that the additional video leakage interference signal is filtered. By means of the frequency change mode, video leakage interference signals can be effectively filtered, and the problem of errors caused by frequency offset and interpolation is solved.
In the invention, the frequency of the radio frequency test signal and the local oscillator signal can be selected according to the test requirement, the frequency difference between the radio frequency test signal and the local oscillator signal is an intermediate frequency signal, generally, the frequency range of the radio frequency test signal is 6GHz-12GHz, the frequency range of the local oscillator signal is 6GHz-12GHz, the frequency of the signal output after the transmission mixing unit is mixed, namely the frequency range of the intermediate frequency signal is 0.1GHz-2GHz, and the frequency range of the video leakage interference signal is 1MHz-4 GHz.
In a specific embodiment, the frequency range of the video leakage interference signal is 1MHz-4GHz, and the intermediate frequency signal required for the test is 0.1GHz-1GHz, so that the frequency of the selected radio frequency test signal is 8GHz, and the frequency range of the local oscillator signal is 8.1GHz-9GHz, so that the frequency range of the intermediate frequency signal obtained by the frequency mixing of the transmitting and frequency mixing unit is 0.1GHz-1GHz, and the frequency range of the video leakage interference signal after being frequency mixed with the local oscillator signal is 4.1GHz-13GHz, and is not in the frequency range output by the transmitting and frequency mixing unit, and is suppressed after passing through the transmitting and frequency mixing unit, thereby achieving the purpose of filtering the video leakage interference signal.
The transmitting unit 6 receives the intermediate frequency signal output from the transmitting and mixing unit 3, and divides the received intermediate frequency test signal into an intermediate frequency test signal of the test branch and an intermediate frequency test signal of the reference branch. The intermediate frequency test signal of the test branch is input to the transmission feed source 7 and is transmitted by the transmission feed source 7 as a test signal.
The intermediate frequency test signal of the reference branch is input to the reference frequency mixing unit 5 as an intermediate frequency reference signal, and is mixed with the local oscillator signal to obtain a radio frequency reference signal and a harmonic interference signal, and then the harmonic interference signal is filtered, and the radio frequency reference signal is retained and output.
The reference receiver 10 receives the rf reference signal output by the reference mixing unit 5 and obtains reference data. The frequency of the reference receiver 10 is synchronized with the first coherent signal source 1 and the reception bandwidth is typically not more than 30 MHz.
At the receiving end, the receiving feed source 9 receives the intermediate frequency test signal of the echo of the target to be tested, and inputs the intermediate frequency test signal to the receiving unit 8.
The receiving unit 8 receives the intermediate frequency test signal from the receiving feed 9 and outputs the intermediate frequency test signal to the receiving mixing unit 4.
The receiving and mixing unit 4 receives the intermediate frequency test signal from the receiving unit 8, performs frequency mixing with the local oscillator signal to obtain a radio frequency test signal and a harmonic interference signal, and then performs gating through a hardware gate, and filters the harmonic interference signal to obtain the radio frequency test signal and output the radio frequency test signal. The environmental interference can be effectively filtered through the on-off modulation of the hardware gate of the transmitting end and the gating of the hardware gate of the receiving end.
The test receiver 11 receives the radio frequency test signal output from the receiving and mixing unit 4 to obtain test data. The frequency of the test receiver 11 is synchronized with the first coherent signal source 1, and the reception bandwidth does not exceed 30MHz in general.
And obtaining an electromagnetic scattering test result according to the radio frequency reference signal received by the reference receiver and the radio frequency test signal received by the test receiver. In a specific embodiment, the radio frequency test signal is divided by a radio frequency reference signal to obtain an electromagnetic scattering test result.
The electromagnetic scattering test link system is suitable for low-frequency electromagnetic scattering/radiation test of spatial filtering by adopting a hardware gate technology.
By utilizing the electromagnetic scattering test link system, the signal amplitude of the video leakage interference signal is lower than the noise floor of the test receiver before the video leakage interference signal enters the test receiver, so that the signal to noise ratio of a test data result is not reduced, the aim of inhibiting the video leakage interference is fulfilled, and the influence of the video leakage interference on low-frequency electromagnetic scattering and radiation measurement can be eliminated. In addition, the frequency of a test result obtained by adopting the test link system is consistent with the test frequency of the target to be tested, data fitting processing is not needed, and the problems of frequency offset and errors introduced by interpolation existing in the traditional method for inhibiting the video leakage interference are solved.
Example two
As shown in fig. 4, the second embodiment is basically the same as the first embodiment, and the description of the same parts is omitted, except that:
the transmit mixing unit 3 may comprise a first hardware gate switch 31 and a first mixer 32. The first hardware gate switch 31 is connected with the first coherent signal source 1, and performs on-off modulation on the input radio frequency test signal. The first mixer 32 is connected to the second coherent signal source 2 and the first hardware gate switch 31, and is configured to mix the radio frequency test signal modulated by the hardware gate on/off with the local oscillator signal to form an intermediate frequency signal, and filter out a video leakage interference signal by setting an output frequency range of the first mixer.
The radio frequency test signal and the additional video leakage interference signal after passing through the first hardware door switch 31 are respectively mixed with the local oscillator signal by a first mixer 32. The radio frequency test signal and the local oscillator signal are mixed to obtain an intermediate frequency test signal with lower frequency and output the intermediate frequency test signal, and the frequency of the interference signal obtained by mixing the additional video leakage interference signal and the local oscillator signal is not within the intermediate frequency output frequency range of the first frequency mixer 32, so that the additional video leakage interference signal can be filtered by setting the output frequency range of the first frequency mixer.
In one embodiment, the transmitting unit 6 may include a directional coupler 61 and a first power amplifier 62. The input intermediate frequency signal passes through a power matching device, enters the first power amplifier 62, and is divided into a test branch and a reference branch by the directional coupler 61.
The intermediate frequency test signal of the reference branch is input as an intermediate frequency reference signal to the reference mixing unit 5. In a preferred embodiment, the reference mixing unit 5 may include: a third mixer 51 and a third filter 52. The third mixer 51 is connected to the directional coupler 61, and is configured to mix the intermediate frequency reference signal with the local oscillator signal to obtain a radio frequency reference signal and a harmonic interference signal. The third filter 52 is connected to the third mixer 51 and the reference receiver 10, and is used for filtering the harmonic interference signal, retaining the rf reference signal and sending the rf reference signal to the reference receiver.
In a preferred embodiment, the receiving unit 8 comprises a first low noise amplifier 81. The first low noise amplifier 81 is connected to the receiving feed 9 and the receiving mixing unit 4, and is configured to form an intermediate frequency test signal according to the test signal received by the receiving feed 9.
In a preferred embodiment, the receiving mixing unit 4 includes: a second mixer 41, a second hardware gate switch 42 and a second filter 43. The second mixer 41 is connected to the first low noise amplifier 81 and the second hardware gate switch 42, and is configured to mix the intermediate frequency test signal with the local oscillator signal to obtain a radio frequency test signal and a harmonic interference signal. The second filter 43 is connected to the second hardware gate switch 42 and the test receiver 11, and is configured to filter out harmonic interference signals, retain the radio frequency test signal, and send the radio frequency test signal to the test receiver 11.
In a preferred embodiment, the electromagnetic scattering test link system further comprises: a power divider 12. The power divider 12 is connected to the second coherent signal source 2, the transmitting mixing unit 3, the reference mixing unit 5, and the receiving mixing unit 4, and is configured to equally divide the local oscillator signal power generated by the second coherent signal source 2 into three parts, which are respectively sent to the transmitting mixing unit 3, the reference mixing unit 5, and the receiving mixing unit 4. Through the power divider, the homology of local oscillation signals of all paths participating in frequency mixing can be ensured.
Another embodiment of the present invention provides a method for suppressing video leakage interference in an electromagnetic scattering test, including the following steps:
carrying out hardware gate on-off modulation on the radio frequency test signal and mixing the radio frequency test signal with a local oscillator signal to form an intermediate frequency signal;
dividing the intermediate frequency signal into an intermediate frequency test signal and an intermediate frequency reference signal, wherein the intermediate frequency test signal is transmitted as a test signal, and the intermediate frequency reference signal is mixed with a local oscillator signal and a radio frequency reference signal is obtained after a harmonic interference signal is filtered;
after receiving an intermediate frequency test signal in an echo of a target to be tested, mixing the intermediate frequency test signal with a local oscillator signal, gating a hardware gate and filtering a harmonic interference signal to obtain a radio frequency test signal;
and obtaining an electromagnetic scattering test result by using the radio frequency reference signal and the radio frequency test signal obtained by the receiving end.
In a preferred embodiment, the hardware gate on-off modulating the radio frequency test signal and mixing the radio frequency test signal with the local oscillator signal to form the intermediate frequency signal specifically includes: firstly, performing hardware gate on-off modulation on a radio frequency test signal, then performing frequency mixing on the radio frequency test signal subjected to hardware gate on-off modulation and a local oscillator signal to form an intermediate frequency signal, and filtering a video leakage interference signal by setting an output frequency range of a first frequency mixer.
In another preferred embodiment, the method further comprises: the power of the local oscillator signal is equally divided into three parts by a power divider.
It should be understood that the principles of the method of the present invention for suppressing video leakage interference in electromagnetic scattering testing are the same as the previous electromagnetic scattering test link system, and therefore the detailed description of the embodiments of the electromagnetic scattering test link system also applies to this method.
In summary, the electromagnetic scattering test link system and the method for suppressing video leakage interference of the present invention are suitable for low-frequency electromagnetic scattering/radiation test that performs spatial filtering by using a hardware gate technology. The magnetic scattering radiation test link system and the method for inhibiting the video leakage interference of the invention mix the video leakage interference signal with the local oscillator signal by using the principle of frequency conversion, thereby filtering the video leakage interference signal and inhibiting the video leakage interference from hardware. Before the video leakage interference signal enters the test receiver, the signal amplitude of the video leakage interference signal is lower than the noise floor of the test receiver, so that the signal to noise ratio of a test data result cannot be reduced, and the purpose of inhibiting the video leakage interference is achieved. In addition, the frequency of the test data obtained by the test link system is consistent with the frequency of the reference data, data fitting processing is not needed, and the problems of frequency offset and errors introduced by interpolation existing in the traditional method for inhibiting the video leakage interference are effectively solved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An electromagnetic scattering test link system, comprising: the device comprises a first coherent signal source, a second coherent signal source, a transmitting frequency mixing unit, a receiving frequency mixing unit, a reference frequency mixing unit, a transmitting feed source, a receiving unit, a receiving feed source, a reference receiver and a test receiver;
the first coherent signal source and the second coherent signal source are respectively used for generating a radio frequency test signal and a local oscillator signal; the radio frequency test signal generated by the first coherent signal source is subjected to hardware gate on-off modulation by the transmitting frequency mixing unit and is mixed with the local oscillator signal to form an intermediate frequency signal;
the intermediate frequency signal is divided into an intermediate frequency test signal and an intermediate frequency reference signal after passing through the transmitting unit, wherein the intermediate frequency test signal is connected with a transmitting feed source and is transmitted as a test signal, and the intermediate frequency reference signal is mixed with a local oscillator signal through a reference mixing unit and is filtered to remove harmonic interference signals to form a radio frequency reference signal and is transmitted to a reference receiver;
and the receiving feed source receives a test signal, the test signal passes through the receiving unit, then the receiving feed source is accessed into the receiving frequency mixing unit to carry out frequency mixing with the local oscillator signal, then hardware gate gating is carried out, harmonic interference signals are filtered, a radio frequency test signal is formed and sent to the test receiver, and a radio frequency reference signal received by the reference receiver and a radio frequency test signal received by the test receiver are used for obtaining an electromagnetic scattering test result.
2. The electromagnetic scattering test link system of claim 1, wherein the transmit mixing unit comprises: a first hardware gate switch and a first mixer;
the first hardware gate switch is connected with the first coherent signal source and is used for on-off modulation of an input radio frequency test signal;
the first frequency mixer is connected with the second coherent signal source and the first hardware door switch and used for mixing the radio frequency test signal subjected to on-off modulation of the hardware door with the local oscillator signal to form an intermediate frequency signal and filtering out a video leakage interference signal by setting the output frequency range of the first frequency mixer.
3. The electromagnetic scattering test link system of claim 1, wherein the transmitting unit comprises: a first power amplifier and a directional coupler;
the first power amplifier is connected with the first mixer and is used for amplifying the power of the received intermediate frequency signal; the directional coupler is connected with the first power amplifier, the transmitting feed source and the reference mixing unit, and divides the intermediate frequency signal passing through the first power amplifier into an intermediate frequency test signal and an intermediate frequency reference signal.
4. The electromagnetic scattering test link system of claim 1, wherein the reference mixing unit comprises: a third mixer and a third filter;
the third mixer is connected with the directional coupler and is used for mixing the intermediate frequency reference signal with the local oscillator signal to obtain a radio frequency reference signal and a harmonic interference signal;
and the third filter is connected with the third mixer and the reference receiver and is used for filtering harmonic interference signals and sending the radio frequency reference signals to the reference receiver.
5. The electromagnetic scattering test link system of claim 1, wherein: the receiving unit comprises a first low noise amplifier; the first low noise amplifier is connected with the receiving feed source and the receiving mixing unit and used for forming an intermediate frequency test signal according to the test signal received by the receiving feed source.
6. The electromagnetic scattering test link system of claim 1, wherein the receive mixing unit comprises: a second mixer, a second hardware gate switch, and a second filter;
the second mixer is connected with the first low-noise amplifier and the second hardware gate switch and is used for mixing the intermediate-frequency test signal with the local oscillator signal to obtain a radio-frequency test signal and a harmonic interference signal;
and the second filter is connected with the second hardware door switch and the test receiver and is used for filtering harmonic interference signals and sending the radio frequency test signals to the test receiver.
7. The electromagnetic scattering test link system of claim 1, further comprising: a power divider; the power divider is connected with the second coherent signal source, the transmitting frequency mixing unit, the reference frequency mixing unit and the receiving frequency mixing unit and is used for equally dividing the local oscillation signal power generated by the second coherent signal source into three parts for output.
8. A method for suppressing video leakage interference in an electromagnetic scattering test is characterized by comprising the following steps:
carrying out hardware gate on-off modulation on the radio frequency test signal and mixing the radio frequency test signal with a local oscillator signal to form an intermediate frequency signal;
dividing the intermediate frequency signal into an intermediate frequency test signal and an intermediate frequency reference signal, wherein the intermediate frequency test signal is transmitted as a test signal, and the intermediate frequency reference signal is mixed with a local oscillator signal and a radio frequency reference signal is obtained after a harmonic interference signal is filtered;
after receiving an intermediate frequency test signal in an echo of a target to be tested, mixing the intermediate frequency test signal with a local oscillator signal, gating a hardware gate and filtering a harmonic interference signal to obtain a radio frequency test signal;
and obtaining an electromagnetic scattering test result by using the radio frequency reference signal and the radio frequency test signal obtained by the receiving end.
9. The method according to claim 8, wherein the performing hardware gate on-off modulation on the radio frequency test signal and mixing with the local oscillator signal to form an intermediate frequency signal specifically comprises:
carrying out hardware gate on-off modulation on the radio frequency test signal;
and mixing the radio frequency test signal subjected to on-off modulation of the hardware gate with the local oscillator signal to form an intermediate frequency signal, and filtering out a video leakage interference signal by setting the output frequency range of the first frequency mixer.
10. The method of suppressing video leakage interference in an electromagnetic scattering test of claim 8, further comprising: the power of the local oscillator signal is equally divided into three parts by a power divider.
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| CN112230209A (en) * | 2020-09-28 | 2021-01-15 | 北京环境特性研究所 | Remote double-station RCS measuring device and method |
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| CN112230209A (en) * | 2020-09-28 | 2021-01-15 | 北京环境特性研究所 | Remote double-station RCS measuring device and method |
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