CN215932011U - Interference machine polarization diversity performance test system - Google Patents
Interference machine polarization diversity performance test system Download PDFInfo
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- CN215932011U CN215932011U CN202120929853.9U CN202120929853U CN215932011U CN 215932011 U CN215932011 U CN 215932011U CN 202120929853 U CN202120929853 U CN 202120929853U CN 215932011 U CN215932011 U CN 215932011U
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Abstract
The utility model relates to the technical field of testing of jammers, and discloses a testing system for polarization diversity performance of a jammer, which comprises: the signal transmitting and receiving system comprises a signal transmitting and receiving system, an interference machine and a control system, wherein the signal transmitting and receiving system comprises: the signal transmitting system comprises a signal transmitting antenna and a signal transmitting amplification processing circuit; the signal transmitting antenna is connected with the output end of the control system through a signal radio frequency cable and a signal transmitting amplification processing circuit; the signal receiving system is formed by connecting a signal receiving antenna with a receiving end of the control system through a signal radio frequency cable and a signal receiving amplification processing circuit; the utility model can judge the polarization diversity performance of the jammer. The problem that the polarization diversity of the jammer is difficult to test is solved, the automatic switching of the transmitting antenna and the receiving antenna is realized, and the automatic selection of various combined modes of the polarization of the transmitting antenna is realized.
Description
Technical Field
The utility model relates to the technical field of performance test of jammers of radars, in particular to a system for testing polarization diversity performance of a jammer.
Background
The diversity technology mainly comprises the following five forms: time diversity, frequency diversity, space diversity, polarization diversity, directional pattern diversity, etc., the first two belonging to the category of coding and signal processing, and the last three belonging to the category of antenna diversity. The polarization diversity technology is a new technology developed by polarization radar based on diversified antennas, and the target identification and the anti-interference through the polarization diversity and polarization adaptive technology are one of the important development directions of the radar technology in recent years. Generally, the interference machine polarization diversity system is divided into a time division diversity system and a simultaneous diversity system. At present, a polarization diversity system is largely applied in the interference technology to improve the interference effect on enemy weapon equipment, but at present, a test method related to the performance of the polarization diversity interference effect is not found in China.
Disclosure of Invention
In order to realize the test of the polarization diversity performance of the jammer, the utility model provides a test system of the polarization diversity performance of the jammer, so that the polarization diversity performance of the jammer can be tested more conveniently, quickly, accurately and efficiently.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an jammer polarization diversity performance test system comprising: signal transmission receiving system, interference machine and control system, signal transmission and receiving system includes: a signal transmitting system and a signal receiving system;
the signal transmitting system comprises a signal transmitting antenna and a signal transmitting amplification processing circuit; the signal transmitting antenna is connected with the output end of the control system through a signal radio frequency cable and a signal transmitting amplification processing circuit;
the signal receiving system comprises a signal receiving antenna and a signal receiving processing circuit; the signal receiving antenna is connected with a receiving end of the control system through a signal radio frequency cable and a signal receiving amplification processing circuit;
the antenna array composed of the signal transmitting antenna and the signal receiving antenna is arranged on the lifting platform through the antenna frame, the interference machine is arranged on the rotary table through the equipment frame, and the lifting platform, the interference machine and the rotary table are respectively connected with the control system through cables.
A test system for polarization diversity performance of an interference machine is characterized in that an antenna array corresponds to an antenna frame, the antenna array is an antenna group with 2 rows and 4 columns, the antenna array is selected to be a broadband antenna, the antenna frame is a rectangular plane antenna frame, 2 rows and 4 columns of antennas are arranged on the antenna frame at equal intervals, the axis of each antenna is perpendicular to the plane of the antenna frame, and the axis of each antenna is parallel to the axis of the antenna frame; the antenna frame is sequentially provided with signal transmitting antennas 1-4 in an uplink direction, 1 'to 4' in a downlink direction are signal receiving antennas, and the signal transmitting antennas 1 to 4 and the signal receiving antennas 1 'to 4' are respectively horizontal polarization antennas, vertical polarization antennas, left-hand circular polarization antennas and right-hand circular polarization antennas;
main lobes of the signal transmitting antenna and the signal receiving antenna are internally provided with jammer antennas; the wave absorbing material is arranged between the signal transmitting antenna and the signal receiving antenna and used for reducing the distance between the transmitting antenna and the receiving antenna and mutual coupling.
A testing system for polarization diversity performance of an interference machine is characterized in that a signal transmitting and amplifying processing circuit comprises a switch matrix switching circuit and a transmitting and amplifying circuit, wherein the switch matrix switching circuit is transmitted by an antenna, the input end of the switch matrix switching circuit is connected with the transmitting and amplifying circuit, and the output end of the switch matrix switching circuit is connected with transmitting antennas 1-4;
the switch matrix switching circuit includes: a one-out-of-four radio frequency switch SP4T and a one-out-of-two radio frequency switch SP 2T;
the transmission amplifying circuit includes: the signal source 1 is connected with the power amplifier 1, the signal source 2 is connected with the power amplifier 2, and the power amplifier 1 and the power amplifier 2 are respectively connected with a first one-out-of-four radio frequency switch SP4T and a second one-out-of-four radio frequency switch SP 4T; the system is used for providing 2 paths of output signals, and is respectively connected with 2 SP4T to provide two paths of radio frequency signals for a transmitting antenna;
a first output end of the first one-of-four radio frequency switch SP4T is connected with the first transmitting antenna through a radio frequency cable; the second output end is connected with a second transmitting antenna through a radio frequency cable and an alternative radio frequency switch SP 2T; the third output end is connected with a third transmitting antenna through a radio frequency cable and an alternative radio frequency switch SP 2T; the fourth output end is connected with a fourth transmitting antenna through a radio frequency cable and an alternative radio frequency switch SP 2T;
the first output end of the second one-of-four radio frequency switch SP4T is connected with the second transmitting antenna through a radio frequency cable and the one-of-two radio frequency switch SP 2T; the second output end is connected with a third transmitting antenna through a radio frequency cable and an alternative radio frequency switch SP 2T; the third output end is connected with a fourth transmitting antenna through a radio frequency cable and an alternative radio frequency switch SP 2T; the fourth output end is connected with the load through a radio frequency cable.
A kind of interference machine polarization diversity performance test system, the said signal receiving amplifies the processing circuit, including switch matrix switching circuit and receiving amplifier circuit of the receiving antenna, the switch matrix switching circuit output end of the said receiving antenna links with receiving amplifier circuit, the input end of the switch matrix switching circuit links with 1 '4' of transmitting antenna, the switch matrix switching circuit is used for choosing one by one to 4 receiving antennas; the input end of the one-out-of-four radio frequency switch is connected with the frequency spectrograph through the low-noise power amplifier; the frequency spectrograph is connected with SP4T, and carries out signal analysis on the received 1 ', 2', 3 ', 4' signals through the receiving antenna; the signal source and the spectrometer realize control signal emission and data receiving and processing through the industrial personal computer.
By adopting the technical scheme, the utility model has the following advantages:
a test system for the polarization diversity performance of an interference machine is provided, a test method for the polarization diversity of the interference machine in a microwave darkroom is provided, the problem that the polarization diversity of the interference machine is difficult to test is solved, the automatic switching of a transmitting antenna and a receiving antenna is realized through a designed radio frequency switch circuit, so that the automatic selection of various combined modes of the polarization of the transmitting antenna is realized, the processing of signals is realized through the automatic selection and data processing of the receiving antenna, and the judgment of the polarization diversity performance of the interference machine is realized.
Drawings
Fig. 1 is a diagram of an antenna mounting design and antenna mounting scheme;
FIG. 2 is a circuit diagram of a transmitting antenna and a combination switch;
FIG. 3 is a circuit diagram of a receive antenna switch;
FIG. 4 is a schematic diagram of the test system applied in a microwave darkroom.
Detailed Description
As shown in fig. 1, 2, 3, and 4, in a testing system for polarization diversity of jammers, the antenna frame is a 2-row and 4-column antenna array, and a broadband antenna is usually selected, first, an antenna frame capable of mounting the antenna array is manufactured, the base of the antenna array is a rectangular planar antenna frame, 2-row and 4-column antennas can be fixedly and equidistantly mounted, the axes of the mounted antennas are perpendicular to the planar mounting support, and the axes are parallel to each other, wherein 1-4 are signal transmitting antennas, 1 ' to 4 ' are signal receiving antennas, and 1 ' to 4 (1 ' to 4 ') are respectively a horizontal polarization antenna, a vertical polarization antenna, a left-hand circular polarization antenna, and a right-hand circular polarization antenna; in order to try to keep the jammer antennas within the main lobe of all the transmit and receive antennas during the test, the 8 transmit and receive antennas should be spaced relatively small, but this results in strong mutual coupling between the antennas. The test system mainly adopts the mode that part of wave-absorbing materials are filled between the antennas, and the influence of mutual coupling of the antennas is reduced physically.
The radio frequency switch group can realize the selection of different transmitting antennas and the selection of receiving antennas, and realizes the switching of different polarization modes of the antennas in sequence through operating software. The circuit diagram of the transmitting antenna switch is shown in fig. 2, and is a switch matrix for antenna transmission, which mainly comprises 2 SP4T switches and 3 SP2T switches, the output of the switch matrix is connected with 4 signal transmitting antennas, the number of the switch matrix is 1-4, wherein 1 SP4T output port is connected with a load, the switching circuit can realize the one-by-one selection of the 4 antennas, the total number is 4 modes, and the switching circuit corresponds to a time-sharing diversity transmitting mode table of a transmitting table 1; the four antennas can be selected pairwise, 6 selection modes of the antennas 1 and 2, 1 and 3, 1 and 4, 2 and 3, 2 and 4, 3 and 4 are respectively realized, and the corresponding antenna transmission modes are a simultaneous diversity transmission mode table in the following table 2; as shown in fig. 3, the receiving antenna switch circuit diagram mainly comprises 1 SP4T switch for outputting 4 signal receiving antennas respectively connected with numbers 1 'to 4', thereby realizing one-by-one selection of 4 receiving antennas; the input and output switch circuit also needs 6 corresponding switch installation boxes, related radio frequency cables and connecting plug-ins, 1 switch power supply and control system and 1 set of control software.
Table 1 time-division diversity transmission mode table
Table 2 simultaneous diversity transmission mode table
The device is configured to be 1 signal source, 1 power divider with 2 paths and 2 power amplifiers, the combination can provide 2 output signals at most, and the output signals are respectively accessed to 2 SP4T to provide two paths of radio frequency signals for the transmitting antenna; the 1 spectrometer is connected to SP4T, and performs signal analysis on the received 1 ', 2', 3 ', 4' signals through the receiving antenna. The signal source and the spectrometer can realize control on the industrial personal computer and can realize signal emission and data receiving and processing.
The test system comprises a lifting platform, a signal transmitting and receiving antenna system, a rotary table, an interference rack and the like. The test system needs to be carried out in a microwave darkroom, the transmitting antenna and the receiving antenna are installed on the lifting platform, the interference machine is arranged on the interference rack of the rotary table, and the center alignment of the antenna of the interference machine and the center of the antenna array can be realized through optical alignment.
The testing method of the testing system for the polarization diversity performance of the interference machine comprises the following steps:
firstly, testing and explaining: (1) the power of each path of input signals reaching the antenna aperture of the jammer is generally 3dB higher than the sensitivity value of the jammer, so that the jammer can work normally.
(2) The test is performed in a microwave dark room or in open field. The test site should meet far field conditions without multipath reflections. The central axis of a standard gain antenna group used by a radio frequency signal source for transmitting signals is aligned. The distance R between the antenna of the jammer and the antenna of the transmitting antenna meets the requirement of (1):
R≥2(D+d)2/λ (1)
in the formula: d is the maximum size of the aperture (equivalent aperture) of the antenna to be measured, m; d is the size of the aperture (equivalent aperture) of the source antenna, m; λ is the shortest operating wavelength, m; and R is the distance between the geometric centers of the source antenna and the measured antenna, and m.
(3) The radio frequency signal source for testing should have output power, power indication and output frequency indication meeting the accuracy requirement, internal pulse modulation capability and pulse parameter indication meeting the accuracy requirement.
(4) The test frequency points are selected, except for other regulations, n (undetermined) frequency points (including upper and lower limit frequency points) are selected randomly according to the frequency band uniform distribution or frequency-removing logarithmic uniform distribution in an interference frequency range specified by a general product specification.
Second, testing step
1. And constructing a polarization diversity test system of the interference machine according to the figure 4. And sequentially connecting the instruments and equipment, communicating the whole test link, lifting the lifting platform, and aligning the jammer with the central axis of the antenna array.
2. The RF signal source is an internal pulse modulation mode, except for other provisions, the modulation pulse width is 1 mus, the pulse repetition frequency is 1kHz, and the output signal frequency is set to a selected first frequency f1The output signal corresponding to each path of signal in the test is greater than the sensitivity value; the frequency spectrograph selects a frequency value corresponding to the signal source (for the time-division diversity system jammer test, only the signal source 1 is needed to transmit a signal, and for the simultaneous diversity system jammer test, the two signal sources are set up in the same way).
3. Firstly, starting a tested jammer, controlling the tested jammer to be in a normal working state, and placing a radio frequency switch at a signal transmitting end in a mode 1 (a time-sharing diversity system or a simultaneous diversity system respectively adopts corresponding modes);
4. and sequentially selecting antennas 1, 2, 3 and 4 (corresponding to horizontal, vertical, left-handed and right-handed rotations respectively) by a radio frequency switch connected with a signal receiving end, and recording signal power values corresponding to the frequency spectrograph under the frequency point respectively.
5. The radio frequency switch at the signal transmitting end is sequentially arranged in other modes (the remaining 3 modes are respectively selected for the jammers of the time division diversity system, and the remaining 5 modes are sequentially selected for the jammers of the simultaneous diversity system), the operation of 4 is repeated, and the data table 3 (the record table of the jammers of the time division diversity system) or the data table 4 (the record table of the jammers of the simultaneous diversity system) is recorded.
6. Changing the frequency of the output signal of the RF signal source to the selected other frequency point f1～fnAnd repeating the steps 3-5, recording the data in the following table, and analyzing and processing.
Table 3 received signal data recording table of interference machine with time-division diversity receiving system
Table 4 received signal data recording table of interference machine with simultaneous diversity receiving system
7. And comparing the judgment of the receiving polarization with the transmission polarization mode according to the tested power values of the signals received by the antennas with different polarizations, and judging the polarization diversity performance of the jammer.
Example one: and testing data of a certain type of time division diversity system radar at 2.5 GHz.
From this test data, it can be determined that the jammer can forward the signal of the polarization mode when transmitting the polarization signal in time division.
Example two: and testing data of the radar of a certain type of simultaneous diversity system at 9.1 GHz.
For the above measurement results, it can be seen that this type of jammer has a certain polarization diversity capability, but the measurement results are somewhat irregular due to the different axial ratio and inclination angle of the retransmitted circularly polarized signals.
Claims (4)
1. A testing system for polarization diversity performance of an interference machine is characterized in that: the method comprises the following steps: the signal transmitting and receiving system comprises a signal transmitting and receiving system, an interference machine and a control system, wherein the signal transmitting and receiving system comprises: the signal transmitting system comprises a signal transmitting antenna and a signal transmitting amplification processing circuit; the signal transmitting antenna is connected with the output end of the control system through a signal radio frequency cable and a signal transmitting amplification processing circuit; the signal receiving system comprises a signal receiving antenna and a signal receiving processing circuit; the signal receiving antenna is connected with a receiving end of the control system through a signal radio frequency cable and a signal receiving amplification processing circuit; the antenna array composed of the signal transmitting antenna and the signal receiving antenna is arranged on the lifting platform through the antenna frame, the interference machine is arranged on the rotary table through the equipment frame, and the lifting platform, the interference machine and the rotary table are respectively connected with the control system through cables.
2. The testing system for the polarization diversity performance of the jammer in claim 1, wherein: the antenna array corresponds to an antenna frame, the antenna array is an antenna group with 2 rows and 4 columns, the antenna array is selected to be a broadband antenna, the antenna frame is a rectangular plane antenna frame, 2 rows and 4 columns of antennas are arranged on the antenna frame at equal intervals, the axis of each antenna is vertical to the plane of the antenna frame, and the axis of each antenna is parallel to the axis of the antenna frame; main lobes of the signal transmitting antenna and the signal receiving antenna are internally provided with jammer antennas; the wave absorbing material is arranged between the signal transmitting antenna and the signal receiving antenna and used for reducing the distance between the transmitting antenna and the receiving antenna and mutual coupling.
3. The testing system for the polarization diversity performance of the jammer in claim 1, wherein: the signal transmitting and amplifying processing circuit comprises a switch matrix switching circuit and a transmitting and amplifying circuit, wherein the switch matrix switching circuit is transmitted by an antenna, the input end of the switch matrix switching circuit is connected with the transmitting and amplifying circuit, and the output end of the switch matrix switching circuit is connected with transmitting antennas 1-4; the switch matrix switching circuit includes: a one-out-of-four radio frequency switch SP4T and a one-out-of-two radio frequency switch SP 2T; the transmission amplifying circuit includes: the signal source 1 is connected with the power amplifier 1, the signal source 2 is connected with the power amplifier 2, and the power amplifier 1 and the power amplifier 2 are respectively connected with a first one-out-of-four radio frequency switch SP4T and a second one-out-of-four radio frequency switch SP 4T; the system is used for providing 2 paths of output signals, and is respectively connected with 2 SP4T to provide two paths of radio frequency signals for a transmitting antenna; a first output end of the first one-of-four radio frequency switch SP4T is connected with the first transmitting antenna through a radio frequency cable; the second output end is connected with a second transmitting antenna through a radio frequency cable and an alternative radio frequency switch SP 2T; the third output end is connected with a third transmitting antenna through a radio frequency cable and an alternative radio frequency switch SP 2T; the fourth output end is connected with a fourth transmitting antenna through a radio frequency cable and an alternative radio frequency switch SP 2T; the first output end of the second one-of-four radio frequency switch SP4T is connected with the second transmitting antenna through a radio frequency cable and the one-of-two radio frequency switch SP 2T; the second output end is connected with a third transmitting antenna through a radio frequency cable and an alternative radio frequency switch SP 2T; the third output end is connected with a fourth transmitting antenna through a radio frequency cable and an alternative radio frequency switch SP 2T; the fourth output end is connected with the load through a radio frequency cable.
4. The testing system for the polarization diversity performance of the jammer in claim 1, wherein: the signal receiving and amplifying processing circuit comprises a switch matrix switching circuit and a receiving and amplifying circuit of receiving antennas, wherein the output end of the switch matrix switching circuit of the receiving antennas is connected with the receiving and amplifying circuit, the input end of the switch matrix switching circuit is connected with the transmitting antennas 1 '-4', and the switch matrix switching circuit is used for selecting 4 receiving antennas one by one; the input end of the one-out-of-four radio frequency switch is connected with the frequency spectrograph through the low-noise power amplifier; the frequency spectrograph is connected with SP4T, and carries out signal analysis on the received 1 ', 2', 3 ', 4' signals through the receiving antenna; the signal source and the spectrometer realize control signal emission and data receiving and processing through the industrial personal computer.
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| CN113189407A (en) * | 2021-04-30 | 2021-07-30 | 中国人民解放军63892部队 | System and method for testing polarization diversity performance of jammer |
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| CN113189407A (en) * | 2021-04-30 | 2021-07-30 | 中国人民解放军63892部队 | System and method for testing polarization diversity performance of jammer |
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