CN104391187A - Alignment calibration device and alignment calibration method of multi-frequency-point antenna array - Google Patents
Alignment calibration device and alignment calibration method of multi-frequency-point antenna array Download PDFInfo
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Abstract
The invention belongs to the field of an alignment calibration technology of a radio frequency simulation system antenna array, and discloses an alignment calibration device and alignment calibration method of a multi-frequency-point antenna array. The alignment calibration device of the multi-frequency-point antenna array, employed by the method, comprises an alignment calibration control management module, an alignment calibration microwave signal source, a four-speaker receiving antenna, a receiver module and a vector network analyzer, wherein the four-speaker receiving antenna is connected with the alignment calibration control management module through the receiver module and the vector network analyzer, and the alignment calibration control management module is respectively connected with a local oscillation microwave signal source, the alignment calibration microwave signal source, a radio frequency control circuit, an antenna array management module of an aligned and calibrated antenna array system, a rotary table control module of an auxiliary measuring device and the like through a netting twine so as to form a local area network type antenna array alignment calibration device. According to the invention, the alignment calibration work of multiple preset frequency points and channels can be finished through alignment calibration at one time, such that the defect of great equipment wear and tear generated when time consumed for alignment calibration increases exponentially as alignment calibration frequency points are increased is solved. The structure is simple, the reliability is high, and the manufacture cost is low.
Description
Technical field
The invention belongs to the calibration technical field of radio freqency simulation system aerial array, relate to broadband radio freqency simulation system antenna array calibration equipment, particularly a kind of multifrequency point antenna array calibration equipment and Calibration Method.
Background technology
Acting as of radio freqency simulation system provides a real electromagnetic signal environment in radiant simulation system.Radio freqency simulation system passes through the relative amplitude of tlv triple subarray institute radiation signal in aerial array and the control of phase place, realize the simulation to radar target position and signal intensity, and according to the simulation to specified signal in combat design, radio freqency simulation system completes by the structure of seal test equipment electromagnetic signal environment.Therefore, the order of accuarcy of radio freqency simulation system simulated target position synthesis, has material impact for by the conclusion (of pressure testing) of seal test equipment.In order to ensure that the synthesis of system simulation target location has enough precision, before radiant simulation system each time, all need the aerial array of radio frequency analogue system to carry out calibration, amplitude-phase consistency requirement is met to make each array element of antenna array, namely the amplitude of each radiating element on whole antenna array and phase place is made all to have identical reference value by calibration, guarantee that the consistent and amplitude proportional relation of the phase place of three tunnel radiofrequency signals of tlv triple aerial radiation meets the space angle requirement of radiation signal, ensure the credibility of Simulation results.And the aerial array scale of universal radio frequency simulation pilot system is large, bay is many, when tested armament-related work frequency is many, needs to study a kind of fast antenna battle array calibration equipment, to save the calibration time.
Existing antenna array calibration equipment related to the present invention as shown in Figure 1.
Calibration System is made up of four loudspeaker receiving antennas, frequency microwave signal source, local oscillator microwave signal source, receiver module, vector network analyzer, calibration control and management module etc., and existing antenna array calibration flow process as shown in Figure 2.
This Calibration System single calibration can only be carried out for single frequency point and single radio frequency passage, and large-scale antenna array generally includes multiple radio-frequency channel and hundreds of array elements, is usually operated on multiple frequency by seal test equipment.Then the time needed for all calibrations of whole antenna array is:
The calibration of a frequency and a passage that Calibration System completes whole antenna array just needs the time of about one day, and the frequency number of tested armament-related work is generally more than ten individual even more, calibration work so only before test just needs considerable time, whole calibrations as 15 frequencies probably need the time of two wheat harvesting periods, when current radio frequency analogue system test resource anxiety, this time overhead needs to avoid as far as possible.
Summary of the invention
For solving the problem of existing Calibration System calibration overlong time, shortening the radio freqency simulation system antenna array calibration time, the invention provides a kind of multifrequency point antenna array calibration equipment and Calibration Method, the calibration of single multifrequency point can be realized, greatly improve calibration efficiency.
For achieving the above object, the technical solution used in the present invention is:
A kind of multifrequency point antenna array calibration equipment, includes calibration control and management module, calibration microwave signal source, local oscillator microwave signal source, four loudspeaker receiving antennas, receiver module, radio frequency control circuit and vector network analyzer,
Described four loudspeaker receiving antennas are connected with calibration control and management module by receiver module, vector network analyzer, calibration control and management module by netting twine respectively with local oscillator microwave signal source, calibration microwave signal source, radio frequency control circuit, be connected by the turning table control module of the antenna array administration module of calibration antenna array system, subsidiary equipment, composition local area network type antenna array calibration equipment;
The output terminal of local oscillator microwave signal source is wherein connected with receiver module by cable; First output terminal of calibration microwave signal source is connected with receiver module, and the second output terminal of calibration microwave signal source is connected with radio frequency control circuit, and radio frequency control circuit output terminal is connected with by calibration antenna array system.
A kind of multifrequency point antenna array calibration equipment, described calibration control and management module is the module for antenna array calibration control and data processing.
A kind of multifrequency point antenna array calibration equipment, described calibration microwave signal source is the microwave launcher for generation of aerial array microwave signal during calibration.
A kind of multifrequency point antenna array calibration equipment, described four loudspeaker receiving antennas are the receiving antenna with four loudspeaker for receiving antenna array radiate radio frequency signals.
A kind of multifrequency point antenna array calibration equipment, described receiver module is the microwave receiving device that signal for receiving antenna carries out mixing amplification.
A kind of multifrequency point antenna array calibration equipment, described radio frequency control circuit is the port controlling information for receiving calibration control and management module, control the circuit that radiofrequency signal is injected into the aerial array radio-frequency channel of calibration, include radio frequency electric switch and ON-OFF control circuit, radio frequency electric switch input terminal is connected with calibration microwave signal source, and radio frequency electric output switching terminal is connected with by calibration antenna array system; Radio frequency electric switch input terminal is connected with ON-OFF control circuit output terminal; ON-OFF control circuit input end is connected with calibration control and management module by LAN (Local Area Network); ON-OFF control circuit to be electrically connected with integrated chip 74FCT by integrated chip EP2C35F484 by integrated chip LAN91C111 and to form.
A kind of multifrequency point antenna array calibration equipment, described vector network analyzer is the instrument for carrying out amplitude and phase compare to the intermediate-freuqncy signal after receiver module amplification.
A kind of multifrequency point antenna array Calibration Method utilizing multifrequency point antenna array calibration equipment, before radiant simulation system, need to calibrate antenna array according to tested armament-related work frequency, the radio frequency output signal of antenna array tlv triple antenna is made to meet amplitude-phase consistency requirement, the multifrequency point calibration of antenna array comprises: the calibration of aerial array initial value, and angle mould intends precision measure and initial value verifies;
1), the calibration of aerial array initial value, be measure the phase and magnitude of each array element radiation signal of antenna array, the difference according to array element radiation signal and reference signal amplitude and phase place generates initial value correction card, and implementation step is as follows:
Step one: optimum configurations, by frequency and the passage of calibration control and management module setting calibration, selected original frequency, passage and antenna array element position;
Step 2: obtain element position, school control and management module selectes the antenna array array element needing calibration, reads element position information;
Step 3: antenna direction element position, element position information is sent to turntable administration module by school control and management module, and turntable administration module, according to the element position information rotating table received, makes receiving antenna point to the antenna array element position needing calibration;
Step 4: measure and record, calibration control and management module controls calibration radio-frequency signal source and microwave local oscillator produces the signal selecting frequency, receiver is delivered to as local oscillation signal in signal one road that microwave local oscillator produces, the signal that calibration radio-frequency signal source produces arrives aerial array through radio frequency control module by selected passage, signal radiate from selected element position by antenna array control module, the radiation signal of four loudspeaker receiving antenna receiving antenna arrays delivers to receiver, receiver is delivered to as reference signal in another road, measure the phase and magnitude difference between antenna array radiation signal and reference signal, and record measurement data,
Step 5: frequency judges, if all frequencies arranged in calibration control and management module complete measurement all, then goes to step seven, otherwise, choose next frequency according to default value of frequency point, repeat step 4;
Step 6: passage judges, if all passages arranged in calibration control and management module complete measurement all, then goes to step seven, otherwise, choose next passage according to default channel value and frequency is set to initial frequency, repeating step 4 ~ step 5.
Step 7: array element judges, if all array elements of antenna array complete measurement all, then goes to step eight, otherwise the array element of next non-calibration selected, repeats step 2 ~ step 5;
Step 8: data processing, for different frequencies and passage, chooses array element radiation signal amplitude minimum with reference signal Magnitude Difference in each array element as benchmark, sets up initial-value table; By initial value table input antenna array control system, control system will be loaded into this table when antenna array works, automatically complete the amplitude of antenna array and the leveling work of phase place;
2), angle mould intends the verification of precision measure and Calibration Data, the function that antenna array angle mould intends the verification of precision measure and Calibration Data is the phase place of synthesizing by measuring tlv triple aerial signal, the amplitude-phase consistency of tlv triple is calibrated according to its phase place simulation precision, verify the precision that antenna array angle mould is intended, implementation step is as follows simultaneously:
Step one: optimum configurations, by frequency and the passage of calibration control and management module setting calibration, selected original frequency, passage and tlv triple position;
Step 2: selected tlv triple, selectes by calibration control and management module the tlv triple needing calibration, reads the analog angle information of its composite signal;
Step 3: antenna direction signal location, the simulation angle position information of tlv triple composite signal is sent to turntable administration module by school control and management module, turntable administration module, according to the simulation angle position information rotating table of the tlv triple composite signal received, makes receiving antenna point to this position;
Step 4: measure and record, calibration control and management module controls calibration radio-frequency signal source and microwave local oscillator produces the signal selecting frequency, the signal that microwave local oscillator produces delivers to receiver as local oscillation signal, the signal that calibration radio-frequency signal source produces arrives aerial array through radio frequency control module by selected passage, signal radiate from selected element position by antenna array control module, four loudspeaker of four loudspeaker receiving antennas respectively receiving antenna array radiation signal and deliver to receiver, measure the phase differential obtaining orientation and pitch orientation two electromagnetic horns respectively, and record,
Step 5: double measurement, turntable horizontally rotates 180 °, again measures the phase differential obtaining orientation and pitch orientation two electromagnetic horns, and according to the two groups of phase differential recorded, calculates the deviation of this tlv triple synthesis signal imitation Angle Position and desired location;
Step 6: frequency judges, if all frequencies arranged in calibration control and management module complete measurement all, then goes to step seven, otherwise, choose next frequency according to default value of frequency point, repeat step 4 ~ step 5;
Step 7: passage judges, if all passages arranged in calibration control and management module complete measurement all, then goes to step eight, otherwise, choose next passage according to default channel value and frequency is set to initial frequency, repeating step 4 ~ step 6;
Step 8: tlv triple judges, if all tlv triple of antenna array complete measurement all, then goes to step nine, otherwise, choose next non-calibration tlv triple, repeat step 2 ~ step 6;
Step 9: data processing, utilizes
calculate aerial array angle simulation error, error amount and given accuracy value are compared, judge whether antenna array simulation angular accuracy meets the requirements.
Owing to adopting technical scheme as above, the present invention has following superiority:
A kind of multifrequency point antenna array calibration equipment and Calibration Method, the method relies on a kind of multifrequency point antenna array calibration equipment, a calibration can complete calibration work to multiple default frequency and passage, overcome the single-frequency point calibration scheme used in background technology, time consumption when calibration increases with the increase exponentially progression of calibration Frequency point, the great defect of equipment loss cost.Its structure is simple, and reliability is high, low cost of manufacture.This multifrequency point antenna array calibration equipment mainly can complete following functions:
(1) electrical specification (phase delay and power loss) of each electrical feed-throughs is measured, set up the correction card of passage length and loss, i.e. the initial value calibration of aerial array;
(2) test of radio frequency target simulation system angle simulation precision and the verification of calibration value, diagnosis array failure.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 be at present antenna array calibration equipment schematic diagram;
Fig. 2 be at present antenna array Calibration Method calibration schematic flow sheet;
Fig. 3 is multifrequency point Calibration System equipment composition frame chart;
Fig. 4 is radio frequency control circuit composition frame chart;
Fig. 5 is phase comparing method measuring principle figure;
Fig. 6 is multifrequency point calibration deployed with devices one figure;
Fig. 7 is multifrequency point calibration deployed with devices two figure;
Fig. 8 is multifrequency point Calibration Method calibration process flow diagram;
Fig. 9 is multifrequency point Proofreading Software surface chart;
Figure 10 is multifrequency point calibration flow process one figure;
Figure 11 is multifrequency point calibration flow process two figure.
Embodiment
As shown in Fig. 3 to Figure 11, a kind of multifrequency point antenna array calibration equipment, include calibration control and management module, calibration microwave signal source, local oscillator microwave signal source, four loudspeaker receiving antennas, receiver module, radio frequency control circuit and vector network analyzer, described four loudspeaker receiving antennas pass through receiver module, vector network analyzer is connected with calibration control and management module, calibration control and management module by netting twine respectively with local oscillator microwave signal source, calibration microwave signal source, radio frequency control circuit, by the antenna array administration module of calibration antenna array system, the turning table control module of subsidiary equipment is connected, composition local area network type antenna array calibration equipment, the output terminal of local oscillator microwave signal source is wherein connected with receiver module by cable, first output terminal of calibration microwave signal source is connected with receiver module, and the second output terminal of calibration microwave signal source is connected with radio frequency control circuit, and radio frequency control circuit output terminal is connected with by calibration antenna array system.
This equipment needs radio freqency simulation system intermediate station and turntable control computer to assist calibration work.Multifrequency point calibration equipment mainly completes following functions:
(1) electrical specification (phase delay and power loss) of each electrical feed-throughs is measured, set up the correction card of passage length and loss, i.e. the initial value calibration of aerial array;
(2) test of radio frequency target simulation system angle simulation precision and the verification of calibration value, diagnosis array failure.The block diagram of system as shown in Figure 3.
Described calibration control and management module is the module for antenna array calibration control and data processing.
Described calibration microwave signal source is the microwave launcher for generation of aerial array microwave signal during calibration.
Described four loudspeaker receiving antennas are the receiving antenna with four loudspeaker for receiving antenna array radiate radio frequency signals.
Described receiver module is the microwave receiving device that signal for receiving antenna carries out mixing amplification.
Described radio frequency control circuit is the port controlling information for receiving calibration control and management module, control the circuit that radiofrequency signal is injected into the aerial array radio-frequency channel of calibration, include radio frequency electric switch and ON-OFF control circuit, radio frequency electric switch input terminal is connected with calibration microwave signal source, and radio frequency electric output switching terminal is connected with by calibration antenna array system; Radio frequency electric switch input terminal is connected with ON-OFF control circuit output terminal; ON-OFF control circuit input end is connected with calibration control and management module by LAN (Local Area Network); ON-OFF control circuit is electrically connected by integrated chip LAN91C111, integrated chip EP2C35F484, integrated chip 74FCT and forms.Circuit composition frame chart as shown in Figure 4.
Described vector network analyzer is the instrument for carrying out amplitude and phase compare to the intermediate-freuqncy signal after receiver module amplification.
This multifrequency point antenna array calibration equipment needs radio freqency simulation system intermediate station and turntable control computer to assist calibration work.Its local oscillator microwave signal source: for generation of local oscillator reference signal required during calibration.
In the present invention, calibration control and management module forms LAN (Local Area Network) by the network equipment and turning table control module, antenna array administration module, calibration microwave signal source, local oscillator microwave signal source and vector network analyzer, calibration microwave signal source, local oscillator microwave signal source and receiving antenna are connected with antenna array and receiver module by cable, receiver module is by cable connected vector network analyzer, four loudspeaker receiving antennas are placed on turntable, and the rotation according to turntable changes antenna direction.
Calibration control and management module during work in the present invention connects 2 by LAN (Local Area Network) and sends to antenna array supervisory computer the passage and the Frequency point information that need calibration, and antenna array administration module completes the control of antenna array according to the control information received, calibration control and management module connects 3 control informations selected to radio frequency control circuit sendaisle by LAN (Local Area Network), calibration control and management module connects 4 by LAN (Local Area Network) and sends signal power to calibration microwave signal source, the control informations such as frequency, control the signal power of radio-frequency signal source by regulation, frequency produces radiofrequency signal, the control signal that calibration microwave signal source produces connects 6 through cable and enters radio frequency control circuit, radio frequency control circuit connects 12 by cable and control signal is injected antenna array, radiofrequency signal needed for control antenna battle array produces, the radiofrequency signal that the microwave signal source of calibration simultaneously produces can connect 7 by cable and enter receiver module, compare as completing phase and magnitude with reference to signal, calibration control and management module connects 5 by LAN (Local Area Network) and sends the control information such as signal power, frequency to local oscillator microwave signal source, control the local oscillation signal that local oscillation signal source produces regulation power and frequency, local oscillation signal connects 8 by cable and enters receiver module, participate in mixing, the signal received by antenna realizes down coversion, calibration control and management module connects 10 by LAN (Local Area Network) and sends instrument control information to vector network analyzer, calibration control and management module connects 1 by LAN (Local Area Network) and sends revolving table position control information to turntable control computer, turntable control computer is according to target position information rotating table, turntable drives four loudspeaker receiving antennas by physical connection 13, makes antenna direction arrive precalculated position, four loudspeaker receiving antennas receive the radiation signal from antenna array, connect 9 by cable and enter receiver module, when carrying out accuracy test, the two paths of signals that receiver receives is all from four loudspeaker receiving antennas, when carrying out initial value calibration, receiver only receives a road signal from antenna, and the signal coupling that calibration microwave signal source produces goes out part energy as with reference to signal, connects 7 enter receiver module by cable, in receiver module, two paths of signals is amplified by mixing, then connect 11 by cable and inject vector network analyzer, vector network analyzer measures amplitude and the phase differential of two paths of signals, measurement result connects 10 through LAN (Local Area Network) and sends to calibration control and management module, finally complete Calibration Data process by calibration control and management module, provide calibration result.
A kind of multifrequency point antenna array Calibration Method, adopt the radiation signal of aerial array with reference signal directly than width with compare phase, obtain the phase and magnitude difference of each road aerial radiation signal and reference signal, namely the phase and magnitude relative difference between signal is obtained, by the difference that compensating measure obtains, complete the calibration of aerial array initial value.The phase comparing method of the beasurement base phase-interferometer principle of aerial array precision completes, and completes the verification of initial value based on the accuracy value measured.
Radiation element off-design position is by inconsistent for the amplitude and phase place causing receiver module two paths of signals, and the size of two paths of signals amplitude and phase difference value and offsets in proportion.Therefore, the measurement of antenna array control angular accuracy after the difference of two paths of signals amplitude and phase place can being utilized to calibrate and the verification of initial value.
The principle of antenna array control precision measure is see shown in phase comparing method measuring principle Fig. 5.The distance received in four electromagnetic horns between loudspeaker A, B is d,
θfor array radiation direction and the angle receiving loudspeaker axis direction, i.e. signal imitation angle error, radiofrequency signal wavelength is λ, then the path length difference of the radiofrequency signal of two passages with the phase differential brought is:
Path length difference:
Phase differential:
θangle is less than tlv triple antenna angle, and tlv triple antenna angle value is very little, under normal circumstances
φthe cycle that can not produce is fuzzy, therefore:
Concrete enforcement is undertaken by multifrequency point antenna array calibration equipment, before radiant simulation system, need to calibrate antenna array according to tested armament-related work frequency, the radio frequency output signal of antenna array tlv triple antenna is made to meet amplitude-phase consistency requirement, if Fig. 8 is multifrequency point Calibration Method calibration process flow diagram, Fig. 9 is multifrequency point Proofreading Software surface chart; The multifrequency point calibration of antenna array comprises two stages: the calibration of aerial array initial value, and angle mould intends precision measure and initial value verifies;
1), the calibration of aerial array initial value,
In the calibration stage of aerial array initial value, the deployment one of calibration equipment as shown in Figure 6.Calibration control and management module, calibration supervisory computer, turntable control computer, calibration radio-frequency signal source, microwave local oscillator and vector network analyzer are formed LAN (Local Area Network) by the network equipment, microwave radio signal controls to be connected with antenna array by cable and feed, four electromagnetic horns, calibration radio-frequency signal source are connected with receiver module by cable with microwave local oscillator, and receiver module is connected with vector network analyzer by cable.
Aerial array initial value calibration flow process one as shown in Figure 10.
The effect of aerial array initial value calibration is measured the phase and magnitude of each array element radiation signal of antenna array, difference according to array element radiation signal and reference signal amplitude and phase place generates initial value correction card, first be that system state is determined, receiving antenna is fixed on antenna rotating platform, connecting device each several part, confirm that calibration equipment each several part connects normal, working properly.
Its concrete steps are as follows:
Step one: optimum configurations, by frequency and the passage of calibration control and management module setting calibration, selected original frequency, passage and antenna array element position; Namely default frequency (can be multiple frequency) and the passage of this calibration are set by the Proofreading Software in control and management module.
Step 2: calibration is carried out, turntable center is aimed at the array element (now the array element needing calibration aimed at by receiving antenna) that need calibrate, each signal source transmits, the frequency that traversal is preset and passage, obtain element position, school control and management module selectes the antenna array array element needing calibration, reads element position information;
Step 3: antenna direction element position, element position information is sent to turntable administration module by school control and management module, and turntable administration module, according to the element position information rotating table received, makes receiving antenna point to the antenna array element position needing calibration;
Step 4: measure and record, calibration control and management module controls calibration radio-frequency signal source and microwave local oscillator produces the signal selecting frequency, receiver is delivered to as local oscillation signal in signal one road that microwave local oscillator produces, the signal that calibration radio-frequency signal source produces arrives aerial array through radio frequency control module by selected passage, signal radiate from selected element position by antenna array control module, the radiation signal of four loudspeaker receiving antenna receiving antenna arrays delivers to receiver, receiver is delivered to as reference signal in another road, measure the phase and magnitude difference between antenna array radiation signal and reference signal, and record measurement data, namely the difference between the reference signal amplitude that under all frequencies of obtaining of register system measurement and array element, array element radiation signal and calibration radio-frequency signal source are launched.
Step 5: frequency judges, if all frequencies arranged in calibration control and management module complete measurement all, then goes to step seven, otherwise, choose next frequency according to default value of frequency point, repeat step 4;
Step 6: passage judges, if all passages arranged in calibration control and management module complete measurement all, then goes to step seven, otherwise, choose next passage according to default channel value and frequency is set to initial frequency, repeating step 4 ~ step 5.
Step 7: array element judges, if all array elements of antenna array complete measurement all, then goes to step eight, otherwise the array element of next non-calibration selected, repeats step 2 ~ step 5; Until all array elements of antenna array are measured complete.
Step 8: data processing, for different frequencies and passage, chooses array element radiation signal amplitude minimum with reference signal Magnitude Difference in each array element as benchmark, sets up initial-value table; By initial value table input antenna array control system, control system will be loaded into this table when antenna array works, automatically complete the amplitude leveling work of antenna array;
2), angle mould intends the verification of precision measure and Calibration Data
In the measurement of angle simulation precision and the verification stage of initial value, the deployment two of calibration equipment as shown in Figure 7.Calibration control and management module, antenna array supervisory computer, turntable control computer, calibration radio-frequency signal source, microwave local oscillator and vector network analyzer are formed LAN (Local Area Network) by the network equipment, microwave radio signal controls to be connected with antenna array by cable and feed, four electromagnetic horns are connected with receiver module by cable with microwave local oscillator, and receiver module is connected with vector network analyzer by cable.
The plan precision measure of aerial array angle mould and initial value calibration workflow two are as shown in figure 11.
The function of the verification of antenna array angle simulation precision is the phase place of the tlv triple aerial signal synthesis by measuring calibration device antenna position, the amplitude-phase consistency of tlv triple is calibrated according to its phase place simulation precision, verify the precision of antenna array analog position simultaneously, namely the measurement of antenna array angle simulation precision determines by the phase differential of measurement tlv triple antenna composite signal the direction that target arrives, obtain the error amount of target location simulation, and the verification of initial value is completed according to the target location simulation error that measurement obtains, first carry out system state to determine, receiving antenna is fixed on antenna rotating platform, connecting device each several part, confirm that calibration equipment each several part connects normal, working properly.Its concrete implementation step is as follows.
Step one: optimum configurations, by frequency and the passage of calibration control and management module setting calibration, selected original frequency, passage and tlv triple position; Namely default frequency (can be multiple) and the passage of this calibration are set by the Proofreading Software in calibration control and management module.
Step 2: selected tlv triple, selectes by calibration control and management module the tlv triple needing calibration, reads the simulation angle position information of its composite signal;
Step 3: antenna direction signal location, carries out calibration; The simulation angle position information of tlv triple composite signal is sent to turntable administration module by calibration control and management module, and turntable administration module, according to the simulation angle position information rotating table of the tlv triple composite signal received, makes receiving antenna point to this position;
Step 4: measure and record, turntable center is aimed at the tlv triple simulating signal Angle Position (now the tlv triple simulating signal Angle Position needing calibration aimed at by receiving antenna) that need calibrate, each signal source radiation signal, the phase differential of two electromagnetic horns in orientation and pitch orientation under all passages that register system measurement obtains and frequency;
Calibration control and management module controls calibration radio-frequency signal source and microwave local oscillator produces the signal selecting frequency, the signal that microwave local oscillator produces delivers to receiver as local oscillation signal, the signal that calibration radio-frequency signal source produces arrives aerial array through radio frequency control module by selected passage, signal radiate from selected element position by antenna array control module, four loudspeaker of four loudspeaker receiving antennas respectively receiving antenna array radiation signal and deliver to receiver, measure the phase differential obtaining orientation and pitch orientation two electromagnetic horns respectively, and record;
Step 5: double measurement, antenna rotating platform horizontally rotates 180 °, again measure the phase differential obtaining orientation and pitch orientation two electromagnetic horns, and according to the two groups of phase differential recorded, calculate the deviation of this tlv triple synthesis signal imitation Angle Position and desired location;
Step 6: frequency judges, if all frequencies arranged in calibration control and management module complete measurement all, then goes to step seven, otherwise, choose next frequency according to default value of frequency point, repeat step 4 ~ step 5;
Step 7: passage judges, if all passages arranged in calibration control and management module complete measurement all, then goes to step eight, otherwise, choose next passage according to default channel value and frequency is set to initial frequency, repeating step 4 ~ step 6;
Step 8: tlv triple judges, if all tlv triple of antenna array complete measurement all, then goes to step nine, otherwise, choose next non-calibration tlv triple, set the simulation angle position information of its composite signal, repeat step 2 ~ step 6; Until all tlv triple in antenna array are measured complete.
Step 9: data processing, utilizes
calculate tlv triple synthesis signal imitation angle error, error amount and given accuracy value are compared, judge whether antenna array tlv triple synthesis signal imitation angular accuracy meets the requirements.
The present invention adopts the radiation signal of aerial array and reference signal directly than width with compare phase, obtain the phase and magnitude difference of each road aerial radiation signal and reference signal, namely the phase and magnitude relative difference between signal is obtained, by the difference that compensating measure obtains, complete the calibration of aerial array initial value; The phase comparing method of the beasurement base phase-interferometer principle of aerial array precision completes, and completes the verification of initial value based on the accuracy value measured; The principle that antenna array control angular accuracy is measured is shown in Figure 6.
The distance received in four electromagnetic horns between loudspeaker A, B is d,
θfor array radiation direction and the angle receiving loudspeaker axis direction, radiofrequency signal wavelength is λ, then the path length difference of the radiofrequency signal of two passages with the phase differential brought is:
Path length difference:
Phase differential:
θangle is less than tlv triple antenna angle, and tlv triple antenna angle value is very little, under normal circumstances
φthe cycle that can not produce is fuzzy, therefore:
。
Claims (8)
1. a multifrequency point antenna array calibration equipment, it is characterized in that: include calibration control and management module, calibration microwave signal source, local oscillator microwave signal source, four loudspeaker receiving antennas, receiver module, radio frequency control circuit and vector network analyzer, described four loudspeaker receiving antennas pass through receiver module, vector network analyzer is connected with calibration control and management module, calibration control and management module by netting twine respectively with local oscillator microwave signal source, calibration microwave signal source, radio frequency control circuit, by the antenna array administration module of calibration antenna array system, the turning table control module of subsidiary equipment is connected, composition local area network type antenna array calibration equipment,
The output terminal of local oscillator microwave signal source is wherein connected with receiver module by cable; First output terminal of calibration microwave signal source is connected with receiver module, and the second output terminal of calibration microwave signal source is connected with radio frequency control circuit, and radio frequency control circuit output terminal is connected with by calibration antenna array system.
2. a kind of multifrequency point antenna array calibration equipment according to claim 1, is characterized in that: described calibration control and management module is the module for antenna array calibration control and data processing.
3. a kind of multifrequency point antenna array calibration equipment according to claim 1, is characterized in that: described calibration microwave signal source is the microwave launcher for generation of aerial array microwave signal during calibration.
4. a kind of multifrequency point antenna array calibration equipment according to claim 1, is characterized in that: described four loudspeaker receiving antennas are the receiving antenna with four loudspeaker for receiving antenna array radiate radio frequency signals.
5. a kind of multifrequency point antenna array calibration equipment according to claim 1, is characterized in that: described receiver module is the microwave receiving device that signal for receiving antenna carries out mixing amplification.
6. a kind of multifrequency point antenna array calibration equipment according to claim 1, it is characterized in that: described radio frequency control circuit is the port controlling information for receiving calibration control and management module, control the circuit that radiofrequency signal is injected into the aerial array radio-frequency channel of calibration, include radio frequency electric switch and ON-OFF control circuit, radio frequency electric switch input terminal is connected with calibration microwave signal source, and radio frequency electric output switching terminal is connected with by calibration antenna array system; Radio frequency electric switch input terminal is connected with ON-OFF control circuit output terminal; ON-OFF control circuit input end is connected with calibration control and management module by LAN (Local Area Network); ON-OFF control circuit to be electrically connected with integrated chip 74FCT by integrated chip EP2C35F484 by integrated chip LAN91C111 and to form.
7. a kind of multifrequency point antenna array calibration equipment according to claim 1, is characterized in that: described vector network analyzer is the instrument for carrying out amplitude and phase compare to the intermediate-freuqncy signal after receiver module amplification.
8. a kind of multifrequency point antenna array Calibration Method of a multifrequency point antenna array calibration equipment as claimed in claim 1, it is characterized in that: be before radiant simulation system, need to calibrate antenna array according to tested armament-related work frequency, the radio frequency output signal of antenna array tlv triple antenna is made to meet amplitude-phase consistency requirement, the multifrequency point calibration of antenna array comprises: the calibration of aerial array initial value, and angle mould intends precision measure and initial value verifies;
1), the calibration of aerial array initial value, be measure the phase and magnitude of each array element radiation signal of antenna array, the difference according to array element radiation signal and reference signal amplitude and phase place generates initial value correction card, and implementation step is as follows:
Step one: optimum configurations, by frequency and the passage of calibration control and management module setting calibration, selected original frequency, passage and antenna array element position;
Step 2: obtain element position, school control and management module selectes the antenna array array element needing calibration, reads element position information;
Step 3: antenna direction element position, element position information is sent to turntable administration module by school control and management module, and turntable administration module, according to the element position information rotating table received, makes receiving antenna point to the antenna array element position needing calibration;
Step 4: measure and record, calibration control and management module controls calibration radio-frequency signal source and microwave local oscillator produces the signal selecting frequency, receiver is delivered to as local oscillation signal in signal one road that microwave local oscillator produces, the signal that calibration radio-frequency signal source produces arrives aerial array through radio frequency control module by selected passage, signal radiate from selected element position by antenna array control module, the radiation signal of four loudspeaker receiving antenna receiving antenna arrays delivers to receiver, receiver is delivered to as reference signal in another road, measure the phase and magnitude difference between antenna array radiation signal and reference signal, and record measurement data,
Step 5: frequency judges, if all frequencies arranged in calibration control and management module complete measurement all, then goes to step seven, otherwise, choose next frequency according to default value of frequency point, repeat step 4;
Step 6: passage judges, if all passages arranged in calibration control and management module complete measurement all, then goes to step seven, otherwise, choose next passage according to default channel value and frequency is set to initial frequency, repeating step 4 ~ step 5;
Step 7: array element judges, if all array elements of antenna array complete measurement all, then goes to step eight, otherwise the array element of next non-calibration selected, repeats step 2 ~ step 5;
Step 8: data processing, for different frequencies and passage, chooses array element radiation signal amplitude minimum with reference signal Magnitude Difference in each array element as benchmark, sets up initial-value table; By initial value table input antenna array control system, control system will be loaded into this table when antenna array works, automatically complete the amplitude of antenna array and the leveling work of phase place;
2), angle mould intends the verification of precision measure and Calibration Data; the function that antenna array angle mould intends the verification of precision measure and Calibration Data measures by phase comparing method the precision that antenna array angle mould intends; precision according to simulation judges the correctness of initial value, completes the verification of Calibration Data; Implementation step is as follows:
Step one: optimum configurations, by frequency and the passage of calibration control and management module setting calibration, selected original frequency, passage and tlv triple position;
Step 2: selected tlv triple, selectes by calibration control and management module the tlv triple needing calibration, reads the simulation angle position information of its composite signal;
Step 3: antenna direction signal location, the simulation angle position information of tlv triple composite signal is sent to turntable administration module by school control and management module, turntable administration module, according to the simulation angle position information rotating table of the tlv triple composite signal received, makes receiving antenna point to this position;
Step 4: measure and record, calibration control and management module controls calibration radio-frequency signal source and microwave local oscillator produces the signal selecting frequency, the signal that microwave local oscillator produces delivers to receiver as local oscillation signal, the signal that calibration radio-frequency signal source produces arrives aerial array through radio frequency control module by selected passage, signal radiate from selected element position by antenna array control module, four loudspeaker of four loudspeaker receiving antennas respectively receiving antenna array radiation signal and deliver to receiver, measure the phase differential obtaining orientation and pitch orientation two electromagnetic horns respectively, and record,
Step 5: double measurement, turntable horizontally rotates 180 °, again measures the phase differential obtaining orientation and pitch orientation two electromagnetic horns, and according to the two groups of phase differential recorded, calculates the deviation of this tlv triple synthesis signal imitation Angle Position and desired location;
Step 6: frequency judges, if all frequencies arranged in calibration control and management module complete measurement all, then goes to step seven, otherwise, choose next frequency according to default value of frequency point, repeat step 4 ~ step 5;
Step 7: passage judges, if all passages arranged in calibration control and management module complete measurement all, then goes to step eight, otherwise, choose next passage according to default channel value and frequency is set to initial frequency, repeating step 4 ~ step 6;
Step 8: tlv triple judges, if all tlv triple of antenna array complete measurement all, then goes to step nine, otherwise, choose next non-calibration tlv triple, repeat step 2 ~ step 6;
Step 9: data processing, utilizes
calculate aerial array angle simulation error, error amount and given accuracy value are compared, judge whether antenna array tlv triple synthesis signal imitation angular accuracy meets the requirements.
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