CN114265025A - Automatic lobe test and angle zero value calibration device of broadband phased array system - Google Patents
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Abstract
The invention discloses an automatic lobe testing and angle zero-value calibrating device for a broadband phased array system, which comprises a lifting type calibrating rod, a calibrating horn, a digital array antenna and a lobe testing and angle zero-value calibrating device, wherein the lifting type calibrating rod is fixedly provided with the calibrating horn, and the lobe testing and angle zero-value calibrating device is respectively connected with the calibrating horn and the digital array antenna; the lobe testing and angle zero value calibration device comprises a trigger pulse generating module, a calibration signal generating module, a data acquisition calculating module and a beam pointing control module, wherein the trigger pulse generating module generates a wave position switching pulse and a frequency switching pulse, sends the wave position switching pulse and the frequency switching pulse to the calibration signal generating module and the data acquisition calculating module, and sends the wave position switching pulse to the beam pointing control module; the invention has the advantages that: provides an automatic lobe testing and angle zero value calibrating device under the condition of no tower.
Description
Technical Field
The invention relates to the field of automatic test of wave lobes in a digital phased array system, in particular to an automatic wave lobe test and angle zero value calibration device for a broadband phased array system.
Background
The vehicle-mounted digital phased array equipment can be used in multiple fields of radar detection, aircraft measurement and control and the like, and has the characteristics of good maneuverability, strong wartime survival capability and the like. In view of this, the aerospace measurement and control equipment is developing a vehicle-mounted digital phased array multi-beam measurement and control system at present.
One of the main functions of the measurement and control system is to measure the orbit of the satellite by measuring the distance and angle of the satellite. The specific method comprises the following steps: the measurement and control system sends a measurement signal to the satellite to acquire the radial distance between the satellite and the measurement and control station. Meanwhile, the measurement and control system obtains a pitch angle and an azimuth angle of the satellite under a measurement and control system array plane coordinate system through an angle measurement technology. And the orbit determination of the satellite can be realized by combining the station address information, the radial distance and the angle measurement result of the measurement and control system. Therefore, the angle measurement result influences the precision of the satellite for measuring the orbit, and therefore calibration of an angle zero value needs to be realized before the satellite is subjected to angle measurement.
When the maneuvering measurement and control system based on the digital phased array executes a task, maneuvering to a temporary station site according to the task requirement. The temporary station address has no external calibration tower under general conditions, which brings difficulty to the accurate angle measurement of a maneuvering measurement and control system.
Chinese patent publication No. CN111257883A discloses a calibration device and method for a phased array weather radar system, the device includes: the frequency source combination module is used for generating a calibration pulse signal in a preset period; the antenna array module is used for receiving echo signals and calibration pulse signals of the phased array weather radar system in real time; the signal processing module is used for acquiring a standard value of the calibration pulse signal and obtaining an echo calibration signal compensation value according to the calibration pulse signal and the standard value of the calibration pulse signal; and the digital transceiving module is used for receiving the echo calibration signal compensation value and calibrating the echo signal according to the echo calibration signal compensation value to obtain the calibrated echo signal. The calibration device and the calibration method for the phased array weather radar system can generate calibration pulse signals, echo signals received by all channels in the phased array weather radar system are calibrated in real time according to the calibration pulse signals and the calibration pulse signal standard values, and the detection accuracy of the phased array weather radar system is improved. But the patent application does not relate to the calibration of an angle zero.
In summary, in order to fully exert the efficiency of the maneuvering measurement and control system based on the digital phased array and realize the accurate measurement of the orbit and lobe performance of the satellite, an automatic lobe test and angle zero-value calibration device under the towerless condition needs to be designed.
Disclosure of Invention
The invention aims to solve the technical problem that the prior art lacks an automatic lobe testing and angle zero-value calibrating device under the condition of no tower.
The invention solves the technical problems through the following technical means: an automatic lobe test and angle zero-value calibration device of a broadband phased array system comprises a lifting calibration rod, a calibration horn, a digital array antenna and a lobe test and angle zero-value calibration device, wherein the lifting calibration rod is fixedly provided with the calibration horn, the relative positions of each unit of the digital array antenna and the calibration horn are fixed, and the lobe test and angle zero-value calibration device is respectively connected with the calibration horn and the digital array antenna; the lobe testing and angle zero value calibration device comprises a trigger pulse generating module, a calibration signal generating module, a data acquisition calculating module and a beam pointing control module, wherein the trigger pulse generating module generates a wave position switching pulse and a frequency switching pulse, and the wave position switching pulse and the frequency switching pulse are sent to a calibration signal generating module and a data acquisition and calculation module, the wave position switching pulse is sent to a beam pointing control module, the calibration signal generating module is controlled to periodically generate a calibration signal, spread out through a calibration loudspeaker, control a beam pointing control module to complete the switching control of different beam pointing angles, control a data acquisition and calculation module to complete calibration signal acquisition, and calculating gain values of different wave positions and different frequency points according to the acquired calibration signals, and obtaining a lobe pattern and actual beam pointing according to the gain values so as to obtain an angle zero value.
The invention is provided with a lifting type calibration rod, a calibration horn is fixed on the lifting type calibration rod, the relative positions of each unit of the digital array antenna and the calibration horn are fixed, when facing a temporary station and having no external calibration tower, the lifting calibration rod is used as the external calibration tower, which brings convenience to the accurate angle measurement of the maneuvering measurement and control system, meanwhile, the trigger pulse generating module controls the calibration signal generating module to periodically generate calibration signals, spread out through a calibration loudspeaker, control a beam pointing control module to complete the switching control of different beam pointing angles, control a data acquisition and calculation module to complete calibration signal acquisition, according to the collected calibration signals, calculating gain values of different wave positions and different frequency points, and obtaining a lobe pattern and an actual beam direction according to the gain values, therefore, an angle zero value is obtained, and automatic lobe testing and angle zero value calibration under the tower-free condition are achieved.
Furthermore, the lifting type calibration rod is arranged at the front end of a compartment of the tractor and is perpendicular to the compartment, a calibration horn is fixed at the top end of the lifting type calibration rod, the compartment of the tractor and the digital array antenna are integrally formed, and the lobe testing and angle zero value calibration device is located on the tractor.
Furthermore, the trigger pulse generation module generates W wave position switching pulses and W × N frequency switching pulses, the W wave position switching pulses are distributed to the calibration signal generation module and the data acquisition calculation module, the W wave position switching pulses are distributed to the beam pointing control module, the period of the wave position switching pulses is Tb, the period of the frequency switching pulses is Tf, and Tb is N × Tf.
Furthermore, the calibration signal generating module generates a frequency point signal of a frequency point fb according to the wave position switching pulse and the frequency switching pulse, where the specific frequency points are:
fb＝f0+k*Δf，N＞k≥0
when the calibration signal generation module receives the (k +1) th frequency switching pulse, outputting a single-point frequency signal fb, which is f0+ (k +1) Δ f; when the calibration signal generation module receives the wave position switching pulse, k is 0, the frequency is reset, and a dot frequency signal fb is output as f 0; and the point frequency signal output by the calibration signal generating module is sent to a calibration loudspeaker.
Furthermore, after receiving the kth frequency switching pulse, the data acquisition and calculation module delays Tf/2, acquires a broadband digital beam signal sent by the digital array antenna, performs N-point FFT on the broadband digital beam signal, performs modulo on the FFT value of the kth point, and stores the modulo value in a wave position-frequency-gain table.
Furthermore, the beam pointing control module generates a scanning wave position theta epsilon [ theta _0-P [ delta ] theta, theta _0+ (P-1) delta theta ], phi epsilon [ phi _0-Q [ delta ] phi, phi _0+ (Q-1) delta phi ], and W is 2P × 2Q wave positions in total according to a pitch angle theta _0 and an azimuth angle phi _0 of the calibration horn in a matrix plane coordinate system; the beam pointing control module sends a beam pointing angle (theta, phi) to the digital array antenna every Tb time; scanning according to the azimuth direction and then scanning according to the elevation direction during lobe scanning; and the wave beam pointing control module receives the wave position switching pulse and controls the digital array antenna to stay in each wave position for a time Tb.
Furthermore, the data acquisition and calculation module extracts a wave position-gain table of all frequency points in the receiving frequency band of the broadband phased array system from the wave position-frequency-gain table, and draws a lobe pattern at the frequency point fb ═ f0+ n ×. delta.f according to the wave position-gain table; taking a lobe pattern at a central frequency point, and searching a wave position number b _ max corresponding to the maximum gain value; setting the Δ G to Th, where Th is less than or equal to 12, finding out a wave bit set S with all gain values greater than G (b _ max, n) - Δ G from a wave bit-gain table corresponding to the frequency point fb:
S＝{w|G(w,n)>G(b_max,n)-ΔG}
thereby obtaining a beam pointing angle (θ _ m, Φ _ m) ═ sum (S)/num (S), where sum (S) represents the sum of the elements in set S, and num (S) represents the number of elements in set S, thereby obtaining an angle zero value of:
(θ_z,φ_z)＝(θ_m,φ_m)-(θ_0,φ_0)。
the invention has the advantages that: the invention is provided with a lifting type calibration rod, a calibration horn is fixed on the lifting type calibration rod, the relative positions of each unit of the digital array antenna and the calibration horn are fixed, when facing a temporary station and having no external calibration tower, the lifting calibration rod is used as the external calibration tower, which brings convenience to the accurate angle measurement of the maneuvering measurement and control system, meanwhile, the trigger pulse generating module controls the calibration signal generating module to periodically generate calibration signals, spread out through a calibration loudspeaker, control a beam pointing control module to complete the switching control of different beam pointing angles, control a data acquisition and calculation module to complete calibration signal acquisition, according to the collected calibration signals, calculating gain values of different wave positions and different frequency points, and obtaining a lobe pattern and an actual beam direction according to the gain values, therefore, an angle zero value is obtained, and automatic lobe testing and angle zero value calibration under the tower-free condition are achieved.
Drawings
Fig. 1 is a block diagram of an automated lobe testing and angle zero-value calibration apparatus of a wideband phased array system according to an embodiment of the present invention;
fig. 2 is a block diagram of a wave lobe testing and angle zero value calibration device in an automated wave lobe testing and angle zero value calibration device of a broadband phased array system disclosed in the embodiment of the present invention;
FIG. 3 is a schematic diagram showing a relationship between a wave position switching pulse and a frequency switching pulse in an automated lobe testing and angle null calibration apparatus of a wideband phased array system according to an embodiment of the present invention;
FIG. 4 is a flowchart of calibration signal generation in an automated lobe testing and angle null-value calibration apparatus for a wideband phased array system according to an embodiment of the present invention;
FIG. 5 is a flow chart of data acquisition in an automated lobe testing and angle null-value calibration apparatus for a wideband phased array system according to an embodiment of the present invention;
fig. 6 is a lobe diagram of 2.25GHz for fb in an embodiment of an automated lobe testing and angle zero-value calibrating apparatus of a wideband phased array system according to an embodiment of the present invention;
fig. 7 is a schematic diagram of each wave position in the set S in an embodiment of an automated lobe testing and angle null calibration apparatus for a wideband phased array system according to an embodiment of the present invention;
fig. 8 is a lobe diagram obtained by narrowing the lobe scanning interval at 2.25GHz in an embodiment of an automated lobe testing and angle zero-value calibrating device for a wideband phased array system according to the present invention;
fig. 9 is a lobe diagram of 2.25GHz fb in another embodiment of an automated lobe testing and angle zero calibration apparatus for a wideband phased array system according to an embodiment of the present invention;
fig. 10 is a schematic diagram of each wave position in the set S in another embodiment of an automated lobe testing and angle null calibration apparatus for a wideband phased array system according to an embodiment of the present invention.
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 embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all 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, an automatic lobe test and angle null value calibration device for a broadband phased array system comprises a lifting calibration rod 1, a calibration horn 2, a digital array antenna 3 and a lobe test and angle null value calibration device 4, wherein the lifting calibration rod 1 is fixed with the calibration horn 2, each unit of the digital array antenna 3 is fixed with the calibration horn 2, and the lobe test and angle null value calibration device 4 is respectively connected with the calibration horn 2 and the digital array antenna 3; in this embodiment, the lifting calibration rod 1 is arranged at the front end of a carriage of the tractor 5 and is perpendicular to the carriage, the calibration horn 2 is fixed at the top end of the lifting calibration rod 1, the carriage of the tractor 5 and the digital array antenna 3 are integrally formed, and the lobe testing and angle zero-value calibration device 4 is located on the tractor 5.
As shown in fig. 2, the lobe testing and angle zero value calibration device 4 includes a trigger pulse generating module 41, a calibration signal generating module 42, a data collecting and calculating module 43, and a beam pointing control module 44, where the trigger pulse generating module 41 generates a wave position switching pulse and a frequency switching pulse, and sends the wave position switching pulse and the frequency switching pulse to the calibration signal generating module 42 and the data collecting and calculating module 43, and sends the wave position switching pulse to the beam pointing control module 44, controls the calibration signal generating module 42 to periodically generate calibration signals, and diffuses out the calibration signals through the calibration horn 2, controls the beam pointing control module 44 to complete different beam pointing angle switching control, controls the data collecting and calculating module 43 to complete calibration signal collection, calculates different wave positions and different gain values according to the collected calibration signals, and obtains a lobe graph and an actual beam pointing according to the gain values, resulting in an angular null.
The trigger pulse generating module 41 generates W wave position switching pulses and W × N frequency switching pulses, and distributes the W wave position switching pulses and the W × N frequency switching pulses to the calibration signal generating module 42, the data acquisition calculating module 43 and the beam pointing control module 44; the period of the wave bit switching pulse is Tb, the period of the frequency switching pulse is Tf, Tb is N × Tf, and the relationship between the wave bit switching pulse and the frequency switching pulse is shown in fig. 3;
the calibration signal generating module 42 generates a frequency point signal of a frequency point fb according to the wave position switching pulse and the frequency switching pulse, where the specific frequency points are:
fb＝f0+k*Δf，N＞k≥0
when the calibration signal generating module 42 receives the (k +1) th frequency switching pulse, it outputs a single-point frequency signal fb ═ f0+ (k +1) Δ f; when the calibration signal generation module 42 receives the wave position switching pulse, k is 0, that is, the frequency is reset, and the output frequency fb is f 0; the dot frequency signal output by the calibration signal generating module 42 is sent to the calibration loudspeaker 2; the flow of the calibration signal generating module 42 generating the calibration dot frequency signal according to the wave position switching pulse and the frequency switching pulse is shown in fig. 4.
After receiving the kth frequency switching pulse, the data acquisition and calculation module 43 delays Tf/2, acquires a broadband digital beam signal sent by the digital array antenna, performs N-point FFT on the broadband digital beam signal, performs modulo on the FFT value of the kth point, and stores the modulo value in a wave position-frequency-gain table, as shown in table 1; the data collection and calculation module workflow is shown in fig. 5.
TABLE 1 WAVE BIT-FREQUENCY-GAIN TABLE
The beam pointing control module 44 generates a scanning wave position theta in accordance with a pitch angle theta _0 and an azimuth angle phi _0 of the calibration horn 2 in a front plane coordinate system, wherein theta belongs to [ theta _0-P delta theta, theta _0+ (P-1) delta theta ], phi belongs to [ phi _0-Q delta phi, phi _0+ (Q-1) delta phi ], and W is 2P × 2Q wave positions in total; the beam pointing control module 44 sends a beam pointing angle (theta, phi) to the digital array antenna every Tb time, wherein theta is selected at equal intervals in the interval of [ theta _0-P [ delta ] theta, theta _0+ (P-1) [ delta ] theta, and phi is selected at equal intervals in the interval of [ phi _0-Q [ delta ] phi, phi _0+ (Q-1) [ delta ] phi ]; scanning according to the azimuth direction and then scanning according to the elevation direction during lobe scanning; the beam pointing control module 44 receives the wave position switching pulse and controls the digital array antenna to stay for a time Tb at each wave position.
The data acquisition and calculation module 43 extracts the wave position-gain table of all frequency points in the receiving frequency band of the wideband phased array system from the wave position-frequency-gain table, for example, the wave position-gain table at the frequency point fb ═ f0+ N ×. Δ f, N ∈ [0, N-1] is shown in table 2 below.
TABLE 2 WAVE POSITION-GAIN METER
The lobe pattern at the frequency point fb ═ f0+ n ×. Δ f can be drawn from the table; taking a lobe pattern at a central frequency point, and searching a wave position number b _ max corresponding to the maximum gain value; setting Δ G ═ Th (Th ≦ 12), finding out a wave bit set S with all gain values greater than G (b _ max, n) - Δ G from a wave bit-gain table corresponding to the frequency point fb:
S＝{w|G(w,n)>G(b_max,n)-ΔG}
thus, the beam pointing angle (θ _ m, Φ _ m) is sum (S)/num (S), where sum (S) represents the sum of the elements in the set S, and num (S) represents the number of elements in the set S. Resulting in an angular null of:
θ_z,φ_z＝(θ_m,φ_m)-(θ_0,φ_0)。
a specific simulation example is given below, a certain vehicle-mounted broadband digital array device works at 2.2-2.3 GHz in receiving mode, the digital array antenna 3 and a vehicle body shelter of the tractor 5 are integrally conformal, and 1 lifting type calibration rod 1 is arranged on the tractor 5. The calibration horn 2 arranged at the top of the lifting calibration rod 1 has a pitch angle theta 0 of 32.31 degrees and an azimuth angle phi 0 of 5.76 degrees under a wavefront coordinate system. The broadband phased array system automatic lobe test and angle zero value calibration device is utilized to carry out broadband lobe scanning.
Let P be 16, that is, the azimuth direction and the pitch direction scan 32 wave positions, respectively, the pitch direction scan interval Δ θ be 1.25 °, and the azimuth direction scan interval Δ Φ be 0.187 °; f0 is 2.2GHz, Δ f is 2MHz, n is 25, fb is 2.25GHz lobe pattern measured by the device of the present invention as shown in fig. 6.
As can be seen from fig. 6, b _ max is (32.31 °,5.76 °), and G (b _ max, fb) is 24.97 dB. Setting Δ G to 9dB, the set S can be derived from the frequency-phase-gain of fb to 2.25 GHz:
S＝{w|G(w,2.25GHz)>24.97-9}
the wave positions in the set S are shown in fig. 7.
According to the method described in the above scheme, the calculation yields (θ _ m, Φ _ m) — (32.30 °,5.76 °), the angle zero value (θ _ z, Φ _ z) — (0.01 °, 0.00 °), and it is seen that the system angle zero value is substantially 0.
In order to further observe the main lobe near θ 0 and Φ 0, the lobe scanning interval Δ θ may be further reduced to 0.1935, and Δ Φ may be further reduced to 0.0645, and the scanning result is shown in fig. 8, so that the situation near the main lobe can be observed more clearly.
The method of angle zero calibration is described below with another embodiment. The calibration horn 2 arranged at the top of the lifting calibration rod 1 has a pitch angle theta 0 of 37.54 degrees and an azimuth angle phi 0 of 0.65 degrees under the array plane coordinate system. Let P be 16, that is, 32 wave bits are scanned in the azimuth direction and the pitch direction, respectively, the pitch direction scanning interval Δ θ be 0.97 °, and the azimuth direction scanning interval Δ Φ be 1.23 °. After the scanning is finished, a frequency-wave position-gain table is obtained, and a lobe pattern with fb equal to 2.25GHz is drawn according to the table as shown in fig. 9.
As can be seen from fig. 8, b _ max is (43.54 °,0.65 °), and G (b _ max, fb) is 32.41 dB. Setting Δ G to 9dB, the set S can be derived from the frequency-phase-gain of fb to 2.25 GHz:
S＝{w|G(w,2.25GHz)>32.41-9}
the wave positions in the set S are shown in fig. 10.
According to the method described in the above scheme, the angle zero (θ _ z, Φ _ z) (-5.82 °, -0.09 °) is calculated as (θ _ m, Φ _ m) (43.36 °, 0.74 °), i.e. the true pointing direction of the beam deviates (θ _ z, Φ _ z) before the main lobe maximum can be directed towards the horn.
Through the technical scheme, the invention is provided with a lifting type calibration rod 1, a calibration horn 2 is fixed on the lifting type calibration rod 1, the relative position of each unit of a digital array antenna 3 and the calibration horn 2 is fixed, when a temporary station address is faced and no external calibration tower exists, the lifting type calibration rod 1 serves as an external calibration tower, the accurate angle measurement of a motor measurement and control system is facilitated, meanwhile, a trigger pulse generation module 41 controls a calibration signal generation module 42 to periodically generate calibration signals and diffuse the calibration signals out through the calibration horn 2, a beam pointing control module 44 is controlled to complete the switching control of different beam pointing angles, a data acquisition and calculation module 43 is controlled to complete the acquisition of the calibration signals, gain values of different wave positions and different frequency points are calculated according to the acquired calibration signals, a lobe graph and actual beam pointing are obtained according to the gain values, and an angle zero value is obtained, the automatic lobe test and the angle zero value calibration under the tower-free condition are achieved.
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 (7)
1. The device is characterized by comprising a lifting type calibration rod, a calibration horn, a digital array antenna and a lobe testing and angle zero value calibration device, wherein the lifting type calibration rod is fixedly provided with the calibration horn, the relative positions of each unit of the digital array antenna and the calibration horn are fixed, and the lobe testing and angle zero value calibration device is respectively connected with the calibration horn and the digital array antenna; the lobe testing and angle zero value calibration device comprises a trigger pulse generating module, a calibration signal generating module, a data acquisition calculating module and a beam pointing control module, wherein the trigger pulse generating module generates a wave position switching pulse and a frequency switching pulse, and the wave position switching pulse and the frequency switching pulse are sent to a calibration signal generating module and a data acquisition and calculation module, the wave position switching pulse is sent to a beam pointing control module, the calibration signal generating module is controlled to periodically generate a calibration signal, spread out through a calibration loudspeaker, control a beam pointing control module to complete the switching control of different beam pointing angles, control a data acquisition and calculation module to complete calibration signal acquisition, and calculating gain values of different wave positions and different frequency points according to the acquired calibration signals, and obtaining a lobe pattern and actual beam pointing according to the gain values so as to obtain an angle zero value.
2. The automated lobe testing and angle zero-value calibration device of the broadband phased array system according to claim 1, wherein the lifting calibration rod is arranged at the front end of a compartment of the tractor and is perpendicular to the compartment, a calibration horn is fixed at the top end of the lifting calibration rod, the compartment of the tractor is integrally formed with the digital array antenna, and the lobe testing and angle zero-value calibration device is positioned on the tractor.
3. The automated lobe testing and angle zero value calibration device of the wideband phased array system according to claim 1, wherein the trigger pulse generation module generates W wave position switching pulses, W x N frequency switching pulses, and distributes the W wave position switching pulses to the calibration signal generation module and the data acquisition calculation module, and at the same time distributes the W wave position switching pulses to the beam pointing control module, the period of the wave position switching pulses is Tb, the period of the frequency switching pulses is Tf, and Tb is N Tf.
4. The automatic lobe testing and angle zero value calibration device of a broadband phased array system according to claim 3, wherein the calibration signal generation module generates a frequency point signal of a frequency point fb according to the wave position switching pulse and the frequency switching pulse, and the specific frequency points are as follows:
fb＝f0+k*Δf，N＞k≥0
when the calibration signal generation module receives the (k +1) th frequency switching pulse, outputting a single-point frequency signal fb, which is f0+ (k +1) Δ f; when the calibration signal generation module receives the wave position switching pulse, k is 0, the frequency is reset, and a dot frequency signal fb is output as f 0; and the point frequency signal output by the calibration signal generating module is sent to a calibration loudspeaker.
5. The automated lobe testing and angle null-value calibration device of claim 4, wherein the data acquisition and calculation module delays Tf/2 after receiving the kth frequency switching pulse, acquires the wideband digital beam signal sent by the digital array antenna, performs N-point FFT on the wideband digital beam signal, performs modulo on the FFT value of the kth point, and stores the modulo value in the wave position-frequency-gain table.
6. The automated lobe testing and angle zero-value calibration device of the broadband phased array system according to claim 5, wherein the beam pointing control module generates scanning wave positions theta e [ theta _0-P Δ theta, theta _0+ (P-1) Δ theta ], phi e [ phi _0-Q Δ phi, phi _0+ (Q-1) Δ phi ], total W is 2P is 2Q wave positions according to a pitch angle theta _0 and an azimuth angle phi _0 of a calibration horn in a wavefront coordinate system; the beam pointing control module sends a beam pointing angle (theta, phi) to the digital array antenna every Tb time; scanning according to the azimuth direction and then scanning according to the elevation direction during lobe scanning; and the wave beam pointing control module receives the wave position switching pulse and controls the digital array antenna to stay in each wave position for a time Tb.
7. The automatic lobe testing and angle zero-value calibration device of the broadband phased array system according to claim 6, wherein the data acquisition and calculation module extracts a wave position-gain table of all frequency points in a receiving frequency band of the broadband phased array system from the wave position-frequency-gain table, and draws a lobe pattern at a frequency point fb (f 0+ n) Δ f according to the wave position-gain table; taking a lobe pattern at a central frequency point, and searching a wave position number b _ max corresponding to the maximum gain value; setting the Δ G to Th, where Th is less than or equal to 12, finding out a wave bit set S with all gain values greater than G (b _ max, n) - Δ G from a wave bit-gain table corresponding to the frequency point fb:
S＝{w|G(w,n)>G(b_max,n)-ΔG}
thereby obtaining a beam pointing angle (θ _ m, Φ _ m) ═ sum (S)/num (S), where sum (S) represents the sum of the elements in set S, and num (S) represents the number of elements in set S, thereby obtaining an angle zero value of:
(θ_z,φ_z)＝(θ_m,φ_m)-(θ_0,φ_0)。
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