CN110806565A - Device and method for testing full-link directional diagram of phased array radar - Google Patents
Device and method for testing full-link directional diagram of phased array radar Download PDFInfo
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Abstract
The invention discloses a device and a method for testing a full-link directional diagram of a phased array radar, and relates to the technical field of radar testing. The testing device comprises a near-field testing system, a PC (personal computer) and auxiliary testing equipment, wherein the auxiliary testing equipment comprises a phase-shifting circuit, a combiner, an up-converter and a passive down-converter; when a transmitting directional diagram is tested, a passive down converter is used for converting a radio frequency reference signal into an intermediate frequency signal, so that the test of a full transmitting radio frequency link flow is realized; when a receiving directional diagram is tested, the phase shift function of the phase shift circuit is utilized, the directional test of all wave beams can be carried out, the error caused by frequency conversion can be offset by utilizing an up-converter and a local oscillator circuit of a tested radar, and the test accuracy is improved; the device can test the whole radio frequency link flow 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 complexity of the test link is reduced, and the cost of the test equipment is reduced.
Description
Technical Field
The invention belongs to the technical field of radar testing, and particularly relates to a device and a method for testing a full-link directional diagram of a phased array radar.
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.
The conventional method or device for testing the phased array radar directional diagram in the industry mainly comprises the following three steps:
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 component is subjected to directional diagram test together, and the main defects of the method are as follows: 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. when the directional diagram is received, for a general phased array radar, the interior of the TR component has a phase shift function and can test the directional diagram of each beam, and for a receiving link adopting a Digital Beam Forming (DBF) technology, the TR component does not need the phase shift function, so that only the 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.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a device and a method for testing a phased array radar full link directional diagram, which can realize the test of a full radio frequency link flow when a near field test system does not have a frequency conversion function, can realize the test of all beam directional diagrams when a receiving directional diagram is tested, and reduce the test complexity.
The invention solves the technical problems through the following technical scheme: a phased array radar full link pattern testing apparatus, comprising: near field test system and PC that is connected with the radar under test respectively, characterized by still includes: the auxiliary test equipment is respectively connected with the tested radar, the near field test system and the PC;
the auxiliary test equipment comprises a multi-path phase shift circuit, a combiner, an up-converter and a passive down-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; the output end of the passive down converter is connected with a frequency conversion circuit of the radar to be tested, and the input end of the passive down converter is connected with the near field test system; the input end of the up-converter and the input end of the passive down-converter are respectively connected with a local oscillator circuit of the radar to be detected.
When the test device of the invention is used for testing the emission directional diagram, the passive down converter is used for converting the frequency of the radio frequency reference signal into the intermediate frequency signal, thus realizing the test of the whole emission radio frequency link flow; the independent passive down converter is adopted, and a frequency conversion function is not required to be added in the near field test system, so that the complexity of a test link is reduced, the requirement on the near field test system is reduced, and the cost of test equipment is reduced; when a receiving directional diagram is tested, the phase shift function of the phase shift circuit is utilized, the directional test of all wave beams can be carried out, the error caused by frequency conversion can be offset by utilizing an up-converter and a local oscillator circuit of a tested radar, and the test accuracy is improved; the testing device can test the whole radio frequency link flow under the condition that the near field testing system does not have the frequency conversion function, so that the testing parameters are more complete, the complexity of the testing link is reduced, and the cost of the testing equipment is reduced; the testing device utilizes the near-field testing system to obtain far-field transmitting and receiving directional patterns without far-field testing 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 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.
Further, the passive down converter comprises a first-stage mixing circuit, a first-stage filter circuit, a second-stage mixing circuit and a third-stage filter circuit which are connected in sequence; the LO end of the primary mixing circuit and the LO end of the secondary mixing circuit are respectively connected with a local oscillator circuit of the radar to be tested, and the RF end of the primary mixing circuit is connected with the output end of the near-field test system; and the output end of the three-stage filter circuit is connected with a frequency conversion circuit of the radar to be detected.
The radio frequency reference signal is converted into an intermediate frequency signal through the two-stage mixing circuit and fed to the radar to be tested, harmonic waves and stray waves generated during frequency conversion are effectively filtered through the three-stage filter, and the influence of the harmonic waves and the stray waves on the radar to be tested in the testing process is avoided.
Furthermore, the primary frequency mixing circuit comprises a mixer U39 with the model of MAC-113H, a 10 th pin of the mixer U39 is connected with a local oscillator circuit of the radar to be tested through a capacitor C186, a 5 th pin of the mixer U39 is connected with the output end of the near field test system through a capacitor C190, and a3 rd pin of the mixer U39 is connected with the input end or the output end of the primary filter circuit through a capacitor C151.
Furthermore, the first-stage filter circuit and the second-stage filter circuit are both filter circuits mainly based on surface acoustic wave filters.
Further, the second-stage mixing circuit adopts a mixer with the model number of MBA-15L.
Furthermore, the three-stage filter circuit comprises a filter U100 with the model of BPF-A60, the 1 st pin or the 12 th pin of the filter U100 is connected with the IF end of the two-stage mixer circuit, and the 12 th pin or the 1 st pin of the filter U100 is connected with the frequency conversion circuit of the radar to be detected through a series circuit formed by a capacitor C165, a resistor R185 and a capacitor C164.
Correspondingly, the test method for the full link directional diagram of the phased array radar comprises the following steps:
step 1: initializing and setting the central frequency and the sampling frequency of the near-field test system;
step 2: the radar to be tested is in a transmitting test mode, the passive down converter acquires a radio frequency reference signal sent by the near field test system, and the radio frequency reference signal is converted into an intermediate frequency signal and fed to the radar to be tested;
and step 3: the radar to be tested converts the received intermediate frequency signal into a radio frequency signal, feeds the radio frequency signal to each TR component through a power divider, and radiates the radio frequency signal through an antenna array surface;
and 4, step 4: a probe of the near-field test system receives a signal radiated by an antenna array surface, compares the signal with an output radio frequency reference signal to obtain near-field amplitude-phase data, and obtains an emission directional diagram after scanning of the whole antenna array surface is completed;
and 5: the tested radar is in a receiving test mode, and the near-field test system radiates a radio frequency reference signal through the probe to feed an antenna array surface of the tested radar;
step 6: the tested radar converts the radio frequency reference signal in the step 5 into an intermediate frequency signal and feeds the intermediate frequency signal to the phase shift circuit;
and 7: the intermediate frequency signal is phase-shifted and then synthesized into a signal by a combiner;
and 8: the signal of the step 7 is converted into a radio frequency signal by an up converter and then fed to a near field test system;
and step 9: and (4) comparing the radio frequency signal in the step (8) with the reference radio frequency signal output in the step (5) by the near field test system to obtain near field amplitude-phase data, and obtaining a receiving directional diagram after the whole antenna array surface is scanned.
The test method of the phased array radar full link directional diagram provided by the invention has the same beneficial effects as the test device.
Advantageous effects
Compared with the prior art, the test device for the phased array radar full link directional diagram provided by the invention has the advantages that when the emission directional diagram is tested, the passive down converter is utilized to convert the frequency of the radio frequency reference signal into the intermediate frequency signal, so that the test of the full emission radio frequency link flow is realized; the independent passive down converter is adopted, and a frequency conversion function is not required to be added in the near field test system, so that the complexity of a test link is reduced, the requirement on the near field test system is reduced, and the cost of test equipment is reduced; when a receiving directional diagram is tested, the phase shift function of the phase shift circuit is utilized, the directional test of all wave beams can be carried out, the error caused by frequency conversion can be offset by utilizing an up-converter and a local oscillator circuit of a tested radar, and the test accuracy is improved; the testing device can test the whole radio frequency link flow under the condition that the near field testing system does not have the frequency conversion function, so that the testing parameters are more complete, the complexity of the testing link is reduced, and the cost of the testing equipment is reduced; the testing device utilizes the near-field testing system to obtain far-field transmitting and receiving directional patterns without far-field testing conditions, and reduces the requirements on site conditions.
The testing device can be used for testing the full link of the transmitting directional diagram and the full link of the receiving directional diagram, the passive down converter does not need an external power supply, the circuit structure is simple, and the testing is convenient and quick.
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 based on the drawings without creative efforts.
FIG. 1 is a block diagram of a test apparatus according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a phase shift circuit according to an embodiment of the present invention, in which fig. 2(a) is a schematic circuit diagram mainly including a switch U6, fig. 2(b) is a schematic circuit diagram mainly including an attenuator U7 and an amplifier U8, fig. 2(c) is a schematic circuit diagram mainly including a transformer U9 and a switch U10, fig. 2(d) is a schematic circuit diagram mainly including a phase shifter U11, fig. 2(e) is a schematic circuit diagram mainly including an attenuator U12 and an amplifier U14, and fig. 2(f) is a schematic circuit diagram mainly including a filter U13; the capacitor C16 in fig. 2(a) is connected to the 5 th pin of U7 in fig. 2(b), the resistor R5 in fig. 2(b) is connected to the capacitor C19 in fig. 2(C), the 3 rd pin of U10 in fig. 2(C) is connected to the capacitor C30 in fig. 2(d), the capacitor C29 in fig. 2(d) is connected to the 5 th pin of U12 in fig. 2(e), and the 3 rd pin of U14 in fig. 2(e) is connected to the capacitor C33 in fig. 2 (f);
FIG. 3 is a block diagram of the structure of a passive down converter in an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a passive down converter in an embodiment of the present invention, in which fig. 4(a) is a schematic circuit diagram mainly including a filter U100, fig. 4(b) is a schematic circuit diagram mainly including a mixer U1, fig. 4(c) is a schematic circuit diagram mainly including a surface acoustic wave filter RF2, fig. 4(d) is a schematic circuit diagram mainly including a surface acoustic wave filter RF1, and fig. 4(e) is a schematic circuit diagram mainly including a mixer U39; the 12 th leg of U100 in fig. 4(a) is connected to the 3 rd leg of U1 in fig. 4(b), the 5 th leg of U1 in fig. 4(b) is connected to the capacitor C1 in fig. 4(C), the capacitor C2 in fig. 4(C) is connected to the 2 nd leg of RF1 in fig. 4(d), and the resistor R2 in fig. 4(d) is connected to the capacitor C151 in fig. 4 (e).
Detailed Description
The technical solutions in the present invention are 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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the testing apparatus for a full link directional diagram of a phased array radar provided by the present invention includes a near field testing system, a PC, and an auxiliary testing device, where the auxiliary testing device includes a multi-path phase shifting circuit, a combiner, an up-converter, and a passive down-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 output end of the passive down converter is connected with a frequency conversion circuit of the radar to be tested, and the input end of the passive down converter is connected with the near field test system; the input end of the up-converter and the input end of the passive down-converter are also connected with a local oscillator circuit of the radar to be detected.
As shown in fig. 2, 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. 2, 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.
As shown in fig. 2, 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 phase shift circuit is controlled by a PC to shift the signal phase of each channel of the main body of the radar to be tested, so that a directional diagram pointed by all required wave beams can be tested, if the phased array radar does not have the function of receiving and shifting the phase on a radio frequency link, only one normal wave beam can be tested generally, for example, an X-waveband phased array radar (only 0-degree wave beam can be tested on the premise of not using the phase shift function) can be used for testing +/-45-degree wave beams (the designed wave beam area of the radar) by using the phase shift function of the phase shift circuit. 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.
As shown in fig. 3, the passive down converter mainly comprises a passive down converter circuit and a filter circuit, the passive down converter circuit mainly has a function of converting radio frequency signals sent by a near field test system to intermediate frequency and then feeding the intermediate frequency to a tested radar, and the filter circuit mainly has a function of suppressing harmonics and strays generated by frequency conversion, so that the influence of the signals on the tested radar in the test process is avoided. The passive down converter is connected with a local oscillator circuit of the radar to be tested, and the local oscillator circuit is utilized to offset errors caused by frequency conversion, so that the test result is more accurate and credible; the passive down converter can be free of an external power supply, and is simple in circuit structure and convenient and fast to test.
As shown in fig. 4, the passive down converter includes a first-stage mixer circuit, a first-stage filter circuit, a second-stage mixer circuit, and a third-stage filter circuit, which are connected in sequence; the LO end (10 th pin) of the primary mixing circuit and the LO end (10 th pin) of the secondary mixing circuit are respectively connected with a local oscillator circuit of the radar to be tested, and the RF end (3 rd pin) of the primary mixing circuit is connected with the output end of the near field test system; and the output end (the 1 st pin or the 12 th pin) of the three-stage filter circuit is connected with a frequency conversion circuit of the radar to be detected.
In this embodiment, the primary mixer circuit includes a high mixer U39 of a model MAC-113H, a 10 th pin of the mixer U39 is connected to a local oscillator circuit of the radar to be tested through a capacitor C186, a 5 th pin of the mixer U39 is connected to an output terminal of the near field test system through a capacitor C190, and a3 rd pin of the mixer U39 is connected to an output terminal (a 6 th pin) of the primary filter circuit through a capacitor C151; the secondary mixing circuit adopts a low mixer with the model of MBA-15L; the primary filter circuit RF1 and the secondary filter circuit RF2 are filter circuits mainly comprising a surface acoustic wave filter, the model of the surface acoustic wave filter is SF1362M38MA to filter high and medium frequencies 1362M, and the input end and the output end of the filter chip are reversible; the three-stage filter circuit comprises a filter U100 with the model of BPF-A60, the 12 th pin of the filter U100 is connected with the IF end (the 3 rd pin) of the second-stage mixing circuit, the 1 st pin of the filter U100 is connected with the frequency conversion circuit of the radar to be detected through a series circuit consisting of a capacitor C165, a resistor R185 and a capacitor C164, the filter U100 is a passive filter and is used for filtering stray signals except for intermediate-frequency signals and then feeding the stray signals to the frequency conversion circuit of the radar to be detected, and the input end and the output end of the filter U100 are mutually reversed.
The auxiliary test equipment can be used for testing the whole radio frequency link flow (a whole transmitting radio frequency link and a whole receiving radio frequency link), generally, a near field test system without a frequency conversion function can only be used for testing an antenna independently when being used for testing, or a TR component + antenna can be tested, the link after frequency conversion can not be tested, the cost of the frequency conversion function in the near field test system is increased, and the link is complex.
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 mainly composed of a N5227A PNA high performance vector network analyzer, and is supplemented with a high performance radio frequency amplifier N4985A unit, 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.
Correspondingly, the test method for the full link directional diagram of the phased array radar comprises the following steps:
step 1: initializing and setting the central frequency and the sampling frequency of the near-field test system;
step 2: the method comprises the following steps that a PC controls a tested radar to be in a transmitting test mode, the tested radar generates a corresponding time sequence control signal in the transmitting test mode, a passive down converter acquires a radio frequency reference signal sent by a near field test system, and the radio frequency reference signal is converted into an intermediate frequency signal and serves as an excitation signal to be fed to the tested radar;
and step 3: the radar to be tested converts the received intermediate frequency signal into a radio frequency signal, feeds the radio frequency signal to each TR component through a power divider, and radiates the radio frequency signal through an antenna array surface;
and 4, step 4: a probe of the near-field test system receives a signal radiated by an antenna array surface, compares the signal with an output radio frequency reference signal to obtain near-field amplitude-phase data, and obtains a far-field directional pattern after the scanning of the whole antenna array surface is finished, namely obtains an emission directional pattern;
and 5: 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, and the near-field test system radiates a radio frequency reference signal to feed an antenna array surface of the tested radar through the probe;
step 6: the tested radar converts the radio frequency reference signal in the step 5 into an intermediate frequency signal through each TR component and a frequency conversion circuit, and feeds the intermediate frequency signal to a phase shift circuit;
and 7: the intermediate frequency signal is phase-shifted (controlled by PC to make the wave beam point to a certain wave position to be tested) and then synthesized into a signal by a combiner;
and 8: the signal of the step 7 is converted into a radio frequency signal by an up converter and then fed to a near field test system;
and step 9: and (3) comparing the radio frequency signal in the step (8) with the reference radio frequency signal output in the step (5) by the near field test system to obtain near field amplitude-phase data, and obtaining a far field directional diagram after the whole antenna array surface is scanned, namely obtaining a receiving directional diagram.
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 conceive of changes or modifications within the technical scope of the present invention, and shall be covered by the scope of the present invention.
Claims (10)
1. A phased array radar full link pattern testing apparatus, comprising: near field test system and 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 tested radar, the near field test system and the PC;
the auxiliary test equipment comprises a multi-path phase shift circuit, a combiner, an up-converter and a passive down-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; the output end of the passive down converter is connected with a frequency conversion circuit of the radar to be tested, and the input end of the passive down converter is connected with the near field test system; the input end of the up-converter and the input end of the passive down-converter are 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 first-stage attenuation circuit and the second-stage attenuation circuit are both circuits mainly comprising attenuators with the models of RFSA 3714.
4. 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.
5. The test device of any one of claims 1-4, wherein: the passive down converter comprises a primary mixing circuit, a primary filter circuit, a secondary mixing circuit and a tertiary filter circuit which are connected in sequence; the LO end of the primary mixing circuit and the LO end of the secondary mixing circuit are respectively connected with a local oscillator circuit of the radar to be tested, and the RF end of the primary mixing circuit is connected with the output end of the near-field test system; and the output end of the three-stage filter circuit is connected with a frequency conversion circuit of the radar to be detected.
6. The test apparatus of claim 5, wherein: the primary frequency mixing circuit comprises a mixer U39 with the model of MAC-113H, a 10 th pin of the mixer U39 is connected with a local oscillation circuit of a radar to be tested through a capacitor C186, a 5 th pin of the mixer U39 is connected with an output end of a near field test system through a capacitor C190, and a3 rd pin of the mixer U39 is connected with an input end or an output end of a primary filter circuit through a capacitor C151.
7. The test apparatus of claim 5, wherein: the first-stage filter circuit and the second-stage filter circuit are both filter circuits mainly based on surface acoustic wave filters.
8. The test apparatus of claim 5, wherein: the secondary mixing circuit adopts a mixer with the model of MBA-15L.
9. The test apparatus of claim 5, wherein: the three-stage filter circuit comprises a filter U100 with the model of BPF-A60, the 1 st pin or the 12 th pin of the filter U100 is connected with the IF end of the two-stage mixer circuit, and the 12 th pin or the 1 st pin of the filter U100 is connected with the frequency conversion circuit of the radar to be detected through a series circuit formed by a capacitor C165, a resistor R185 and a capacitor C164.
10. A test method for a full link directional diagram of a phased array radar is characterized by comprising the following steps:
step 1: initializing and setting the central frequency and the sampling frequency of the near-field test system;
step 2: the radar to be tested is in a transmitting test mode, the passive down converter acquires a radio frequency reference signal sent by the near field test system, and the radio frequency reference signal is converted into an intermediate frequency signal and fed to the radar to be tested;
and step 3: the radar to be tested converts the received intermediate frequency signal into a radio frequency signal, feeds the radio frequency signal to each TR component through a power divider, and radiates the radio frequency signal through an antenna array surface;
and 4, step 4: a probe of the near-field test system receives a signal radiated by an antenna array surface, compares the signal with an output radio frequency reference signal to obtain near-field amplitude-phase data, and obtains an emission directional diagram after scanning of the whole antenna array surface is completed;
and 5: the tested radar is in a receiving test mode, and the near-field test system radiates a radio frequency reference signal through the probe to feed an antenna array surface of the tested radar;
step 6: the tested radar converts the radio frequency reference signal in the step 5 into an intermediate frequency signal and feeds the intermediate frequency signal to the phase shift circuit;
and 7: the intermediate frequency signal is phase-shifted and then synthesized into a signal by a combiner;
and 8: the signal of the step 7 is converted into a radio frequency signal by an up converter and then fed to a near field test system;
and step 9: and (4) comparing the radio frequency signal in the step (8) with the reference radio frequency signal output in the step (5) by the near field test system to obtain near field amplitude-phase data, and obtaining a receiving directional diagram after the whole antenna array surface is scanned.
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