CN211627810U - Test device for receiving directional diagram of phased array radar full link - Google Patents
Test device for receiving directional diagram of phased array radar full link Download PDFInfo
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- CN211627810U CN211627810U CN201922169693.8U CN201922169693U CN211627810U CN 211627810 U CN211627810 U CN 211627810U CN 201922169693 U CN201922169693 U CN 201922169693U CN 211627810 U CN211627810 U CN 211627810U
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Abstract
The utility model discloses a phased array radar full link reception directional diagram's testing arrangement relates to radar test technical field. The testing device comprises a near field testing system, a PC (personal computer) and auxiliary testing equipment, and the wave beams are directed to a certain wave position to be tested through a phase shifting circuit of the auxiliary testing equipment, so that the test of the direction of all the wave beams is realized, namely, the normal wave beams can be tested, and the wave beams in other directions can also be tested; the test complexity is reduced through the up-converter of the auxiliary test equipment, the requirement on a near field test system is reduced, the test of a full-receiving radio frequency link flow can be realized, and the test parameters are more complete.
Description
Technical Field
The utility model belongs to the technical field of the radar, especially, relate to a phased array radar full link receives testing arrangement of digraph.
Background
The antenna directional diagram represents the distribution of the antenna radiation energy in the space and reflects the performance index and the working state of the antenna. Important antenna parameters such as the directional coefficient, gain, half-power beam width and side lobe level of the antenna can be determined by measuring the antenna pattern. The radiation characteristics of the antenna are analyzed, analysis data can be provided for debugging, installation, maintenance and overhaul of the antenna in the using process, whether the performance index of the antenna meets the requirement or not is judged, and whether the antenna has a fault or not is judged.
At present, the method or the device for testing the receiving directional diagram of the phased array radar in the industry mainly comprises the following three methods:
the first is to perform a single directional pattern test only for the passive antenna, which is not a full link test, and can only obtain the performance of the antenna, and can only test the normal beam.
Secondly, the antenna + TR assembly is subjected to a directional diagram test together, as shown in the dotted frame part of fig. 1, which has the following main disadvantages: a. the method is not a full link test, only can reflect the performance of an antenna + TR radio frequency end, and for the scheme that each channel comprises a variable frequency link, a variable frequency circuit and an intermediate frequency circuit cannot be tested, so that the performance of the full link cannot be reflected; b. for a general phased array radar, the interior of the TR component has a phase shifting function and can test the directional diagram of each wave beam, and for a receiving link adopting a Digital Beam Forming (DBF) technology, the TR component does not need the phase shifting function, so that only a normal directional diagram can be tested.
And the third method is to use the whole phased array radar as a whole tested piece to carry out directional diagram test, the test method is full link test, the method has the main defects that the requirements on site conditions are complex, far field test conditions are required, the requirements on the test site of the phased array radar with a lower frequency band are large, and the test result is easily influenced by the environment.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a phased array radar full link receives testing arrangement of directional diagram to realize the test of all beam directional diagrams, and realize receiving the radio frequency link test entirely when near field test system does not possess the frequency conversion function.
The utility model discloses a solve above-mentioned technical problem through following technical scheme: a test device for a full-link reception directional diagram of a phased array radar comprises: near field test system, PC machine be connected with the radar of being surveyed respectively, characterized by still includes: the auxiliary test equipment is respectively connected with the near field test system, the PC and the tested radar;
the auxiliary test equipment comprises a multi-path phase shift circuit, a combiner and an up-converter; the input ends of the multiple paths of phase shift circuits are respectively connected with multiple paths of intermediate frequency circuits of the radar to be detected, and the output ends of the multiple paths of phase shift circuits are connected with the input end of the combiner; the output end of the combiner is connected with the input end of the up-converter, and the output end of the up-converter is connected with the near field test system; and the input end of the up-converter is also respectively connected with a local oscillator circuit of the radar to be detected.
The device of the utility model, when receiving the test of the directional diagram, the PC controls the tested radar to be in the receiving test mode, the tested radar generates the corresponding sequential control signal under the receiving test mode, the near field test system radiates out the radio frequency reference signal through the probe to feed the antenna array surface of the tested radar, the radio frequency reference signal passes through each TR component and the frequency conversion circuit in the tested radar to be converted into the intermediate frequency signal, the intermediate frequency signal passes through the intermediate frequency circuit to be fed into the phase shift circuit in the auxiliary test device, the intermediate frequency signal passes through the phase shift circuit to be converted into one path (the wave beam is controlled by the PC to point to a certain wave position which is desired to be tested) and then is converted into the radio frequency signal by the combiner, the near field test system compares the radio frequency signal with the output reference radio frequency reference signal to obtain the near field amplitude phase data, the far field directional diagram can be obtained after the whole antenna array surface is, namely, a receiving directional diagram is obtained; the device can perform the test of all beam directions by utilizing the phase shift function of the auxiliary test equipment, and can offset the error caused by frequency conversion by utilizing the up-converter and the local oscillator circuit of the tested radar, thereby improving the test accuracy; the device can test the process of the full-receiving radio frequency link under the condition that the near-field test system does not have the frequency conversion function, so that the test parameters are more complete, the test complexity is reduced, and the cost of test equipment is reduced; the device utilizes the near field test system to obtain the far field reception directional diagram, does not need to have far field test conditions, and reduces the requirements on site conditions.
Furthermore, one of the phase shift circuits comprises a primary switch circuit, a primary attenuation circuit, a primary amplification circuit, a transformer circuit, a secondary switch circuit, an analog phase shift circuit, a secondary attenuation circuit, a secondary amplification circuit and a filter circuit which are connected in sequence; one input end of the primary switch circuit is connected with one path of intermediate frequency circuit of the radar to be detected, and the output end of the filter circuit is connected with the input end of the combiner.
Furthermore, the primary switch circuit and the secondary switch circuit are both circuits mainly based on a single-pole double-throw switch with the model number of HMC349AMS8 GE.
Furthermore, the first-stage attenuation circuit and the second-stage attenuation circuit are both circuits mainly based on an attenuator with the model number of RFSA 3714.
Furthermore, the analog phase shift circuit comprises a phase shifter U11 with the model number of JPHS-51, the 1 st pin of the phase shifter U11 is connected with the output end of the two-stage switch circuit through a capacitor C30, and the 7 th pin of the phase shifter U11 is connected with the input end of the two-stage attenuation circuit through a series circuit consisting of a capacitor C31, a resistor R16 and a capacitor C29.
Advantageous effects
Compared with the prior art, the utility model provides a test device of directional graph is received to accuse battle array radar full link will through the phase shift circuit of supplementary test equipment the wave beam is directional a certain wave position that wants to test, has realized the directional test of all wave beams, can both test normal direction wave beam promptly, also can test the wave beam of other directions; the test complexity is reduced through the up-converter of the auxiliary test equipment, the requirement on a near field test system is reduced, the test of a full-receiving radio frequency link flow is realized, and the test parameters are more complete. The device has simple structure, convenient operation and strong practical significance.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a second testing device in the background art of the present invention;
FIG. 2 is a block diagram of a testing device according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a phase shift circuit according to an embodiment of the present invention, in which fig. 3(a) is a schematic circuit diagram mainly including a switch U6, fig. 3(b) is a schematic circuit diagram mainly including an attenuator U7 and an amplifier U8, fig. 3(c) is a schematic circuit diagram mainly including a transformer U9 and a switch U10, fig. 3(d) is a schematic circuit diagram mainly including a phase shifter U11, fig. 3(e) is a schematic circuit diagram mainly including an attenuator U12 and an amplifier U14, and fig. 3(f) is a schematic circuit diagram mainly including a filter U13; the capacitor C16 in fig. 3(a) is connected to the 5 th pin of U7 in fig. 3(b), the resistor R5 in fig. 3(b) is connected to the capacitor C19 in fig. 3(C), the 3 rd pin of U10 in fig. 3(C) is connected to the capacitor C30 in fig. 3(d), the capacitor C29 in fig. 3(d) is connected to the 5 th pin of U12 in fig. 3(e), and the 3 rd pin of U14 in fig. 3(e) is connected to the capacitor C33 in fig. 3 (f).
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 2, the utility model provides a phased array radar full link receives testing arrangement of digraph, include: the system comprises a near field test system and a PC which are respectively connected with a tested radar, and auxiliary test equipment which is respectively connected with the near field test system, the PC and the tested radar. The auxiliary test equipment comprises a multi-path phase-shifting circuit, a combiner and an up-converter; the input end of the multipath phase-shifting circuit is respectively connected with the multipath intermediate frequency circuit of the radar to be detected, and the output end of the multipath phase-shifting circuit is connected with the input end of the combiner; the output end of the combiner is connected with the input end of the up-converter, and the output end of the up-converter is connected with the near field test system; the up-converter is also connected with a local oscillator circuit of the radar to be detected.
Phase shift circuit among the auxiliary test equipment is controlled by the PC and is carried out the signal phase shift to each passageway of radar subject under test, can test the directional diagram of required all wave beams like this, if do not possess the phased array radar who receives the phase shift function on the radio frequency link, generally can only carry out the test of a normal direction wave beam, for example, X wave band phased array radar (not utilizing auxiliary test equipment under the phase shift function prerequisite, can only test 0 wave beam), and the utility model discloses utilize phase shift circuit's the phase shift function, can test 45 wave beam (the design wave beam region of this radar). The combiner has the function of combining the data of a plurality of channels into one path. The up-converter's function utilizes the local oscillator signal of being surveyed radar main part conveying, accomplishes the frequency conversion function from intermediate frequency to radio frequency, finally sends radio frequency signal to near field test system and tests, and the up-converter has reduced the complexity of test, has reduced the requirement to near field test system simultaneously, and the local oscillator circuit of being surveyed radar main part provides the local oscillator signal unanimous with radar main part frequency conversion circuit for the up-converter, makes the test result more accurate credible.
The auxiliary test equipment is utilized to test the process of fully receiving the radio frequency link, generally, the near field test system without the frequency conversion function can only test the antenna independently when testing, or the TR component + antenna can not test the link after frequency conversion, the cost of the near field test system for increasing the frequency conversion function is expensive, the link is complex, and the auxiliary test equipment can be utilized to test the process of fully receiving the radio frequency link on the premise that the near field test system does not have the frequency conversion function, so that the test parameters are more complete, the complexity of the test conditions is reduced, the requirement on the near field test system is reduced, and the cost of the test equipment is reduced.
As shown in fig. 3, one phase shift circuit includes a first-stage switch circuit U6, a first-stage attenuation circuit U7, a first-stage amplification circuit U8, a transformer circuit U9, a second-stage switch circuit U10, an analog phase shift circuit U11, a second-stage attenuation circuit U12, a second-stage amplification circuit U14, and a filter circuit U13, which are connected in sequence; one input end (RF 1 end) of the primary switch circuit U6 is connected with one intermediate frequency circuit of the radar to be detected, and the output end of the filter circuit U13 is connected with the input end of the combiner; the other input end (RF 2 end) of the primary switch circuit U6 is connected with a corresponding circuit when other functions are needed, and is not needed to be connected when other functions are not needed. In this embodiment, no other functions need to be implemented, and therefore, the RF2 terminal of the primary switch circuit U6 does not need to be connected to other circuits. In this embodiment, the primary switch circuit U6 and the secondary switch circuit U10 are both circuits mainly including a single-pole double-throw switch of the model HMC349AMS8GE, and the single-pole double-throw switch of the model HMC349AMS8GE has advantages of high isolation, low insertion loss, high input linearity, high power handling, and the like.
As shown in fig. 3, the primary attenuation circuit U7 and the secondary attenuation circuit U12 are both circuits mainly based on an attenuator of model RFSA3714, and determine the specific attenuation of the attenuator according to which angle the beam is directed; a 7-bit digital step attenuator model RFSA3714 has high linearity over the entire 31.75dB gain control range, with a step size of 0.25dB, and low insertion loss of 1.5dB at 2 GHz. For the control of the attenuation of the attenuator, reference is made to patent document CN200910189482.9 entitled radio frequency front end device, gain control method and system thereof.
As shown in fig. 3, the analog phase shift circuit includes a phase shifter U11 of JSPHS-51, the 1 st pin of the phase shifter U11 is connected to the output terminal of the two-stage switch circuit through a capacitor C30, and the 7 th pin of the phase shifter U11 is connected to the input terminal of the two-stage attenuator circuit through a series circuit composed of a capacitor C31, a resistor R16, and a capacitor C29. The analog phase shifter with the model number of JPHS-51 has low insertion loss, excellent voltage standing wave ratio, excellent weldability and strain elimination capability.
The utility model discloses in, combiner and up-converter are current products, all sell on the market, can select the combiner and the up-converter of corresponding model as required.
The near field test system is connected with a control circuit of the radar to be tested through a radio frequency interface (high-precision clock) and an LVTTL level interface (pulse synchronous signal). The near field test system mainly has the functions of acquiring near field good phase data of a radar to be tested by using a near field scanning frame and calculating a far field directional diagram by using a near field test principle. In this embodiment, the near field test system does not have a frequency conversion function, and is a prior art, and can be customized by a manufacturer according to test requirements, for example, a microwave darkroom is a near field test system, a receiving and analyzing part of a test site is composed of a N5227A type PNA high performance vector network analyzer as a core, and a high performance radio frequency amplifier N4985A unit as an auxiliary, the whole test is self-organized, a test instrument is common for different test frequency bands and different test methods, and various antennas and various parameters of antennas of different frequency bands can be measured by replacing reference/test mixing components of different frequency bands and corresponding connecting cables and adapters. Reference may also be made to patent document with an authorization announcement number of CN107329003B, entitled method for optimizing SAR antenna pattern test, which discloses that in a planar near-field test system environment, a planar near-field test system is used to obtain near-field test data of a corresponding wave position, and then near-field and far-field data transformation is performed on the near-field test data to obtain a SAR antenna test pattern; or a Baidu encyclopedia antenna near-field test system, is also introduced.
The utility model discloses a theory of operation does: when a receiving direction diagram is tested, the PC controls the tested radar to be in a receiving test mode, the tested radar generates a corresponding time sequence control signal in the receiving test mode, the near field test system radiates a radio frequency reference signal through the probe to feed an antenna array surface of the tested radar, the radio frequency reference signal is converted into an intermediate frequency signal through each TR component and the frequency conversion circuit in the tested radar, the intermediate frequency signal is fed into a phase shift circuit in the auxiliary test equipment through the intermediate frequency circuit, the intermediate frequency signal is combined into one path through the combiner after being phase-shifted through the phase shift circuit (the beam is controlled by the PC to point to a certain wave position to be tested), the intermediate frequency signal is converted into a radio frequency signal through the up converter to be fed into the near field test system, the near field test system compares the radio frequency signal with the output reference radio frequency reference signal to obtain near field amplitude phase data, and a far field diagram can be obtained, i.e. to obtain the reception pattern.
The device of the utility model can perform the directional test of all wave beams by utilizing the phase shift function of the auxiliary test equipment, and can offset the error caused by frequency conversion by utilizing the local oscillation circuit of the up-converter and the tested radar, thereby improving the test accuracy; the device can test the process of the full-receiving radio frequency link under the condition that the near field test system does not have the frequency conversion function, so that the test parameters are more complete.
The above disclosure is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or modifications within the technical scope of the present invention, and all should be covered by the scope of the present invention.
Claims (5)
1. A test device for a full-link reception directional diagram of a phased array radar comprises: near field test system, PC that is connected with the radar under test respectively, its characterized in that still includes:
the auxiliary test equipment is respectively connected with the near field test system, the PC and the tested radar;
the auxiliary test equipment comprises a multi-path phase shift circuit, a combiner and an up-converter; the input ends of the multiple paths of phase shift circuits are respectively connected with multiple paths of intermediate frequency circuits of the radar to be detected, and the output ends of the multiple paths of phase shift circuits are connected with the input end of the combiner; the output end of the combiner is connected with the input end of the up-converter, and the output end of the up-converter is connected with the near field test system; and the input end of the up-converter is also respectively connected with a local oscillator circuit of the radar to be detected.
2. The test apparatus of claim 1, wherein: one path of the phase-shifting circuit comprises a primary switch circuit, a primary attenuation circuit, a primary amplification circuit, a transformer circuit, a secondary switch circuit, an analog phase-shifting circuit, a secondary attenuation circuit, a secondary amplification circuit and a filter circuit which are connected in sequence; one input end of the primary switch circuit is connected with one path of intermediate frequency circuit of the radar to be detected, and the output end of the filter circuit is connected with the input end of the combiner.
3. The test apparatus of claim 2, wherein: the primary switch circuit and the secondary switch circuit are both circuits mainly comprising a single-pole double-throw switch with the model number of HMC349AMS8 GE.
4. The test apparatus of claim 2, wherein: the first-stage attenuation circuit and the second-stage attenuation circuit are both circuits mainly comprising attenuators with the models of RFSA 3714.
5. The test apparatus of claim 2, wherein: the analog phase shift circuit comprises a phase shifter U11 with the model number of JPHS-51, the 1 st pin of the phase shifter U11 is connected with the output end of the secondary switch circuit through a capacitor C30, and the 7 th pin of the phase shifter U11 is connected with the input end of the secondary attenuation circuit through a series circuit consisting of a capacitor C31, a resistor R16 and a capacitor C29.
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| CN201922169693.8U CN211627810U (en) | 2019-12-06 | 2019-12-06 | Test device for receiving directional diagram of phased array radar full link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062791A (en) * | 2021-11-11 | 2022-02-18 | 中国电子科技集团公司第二十九研究所 | Injection mode measurement electronic equipment beam pointing test method and device |
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- 2019-12-06 CN CN201922169693.8U patent/CN211627810U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062791A (en) * | 2021-11-11 | 2022-02-18 | 中国电子科技集团公司第二十九研究所 | Injection mode measurement electronic equipment beam pointing test method and device |
| CN114062791B (en) * | 2021-11-11 | 2023-04-25 | 中国电子科技集团公司第二十九研究所 | Method and device for testing beam pointing direction of injection mode measurement electronic equipment |
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Address after: 312035 Floor 1, Workshop 2, No. 1417, Renmin East Road, Fubu Street, Yuecheng District, Shaoxing City, Zhejiang Province Patentee after: Zhejiang Yitong Huasheng Technology Co.,Ltd. Address before: 3 / F, building 5, Xinggong Science Park, 100 Luyun Road, Changsha hi tech Development Zone, Hunan 410000 Patentee before: HUNAN EASTONE WASHON TECHNOLOGY Co.,Ltd. |
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