CN113009436B - Spatial angular position parameter calibration method - Google Patents
Spatial angular position parameter calibration method Download PDFInfo
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- CN113009436B CN113009436B CN202110209220.5A CN202110209220A CN113009436B CN 113009436 B CN113009436 B CN 113009436B CN 202110209220 A CN202110209220 A CN 202110209220A CN 113009436 B CN113009436 B CN 113009436B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0205—Details
- G01S5/021—Calibration, monitoring or correction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The invention belongs to the field of space positioning, and particularly discloses a space angular position parameter calibration method, which comprises the following specific steps: s1, simulating the speed of a moving target by a diffuser simulation source to be calibrated, outputting a radio frequency signal by a signal source, and directly accessing the radio frequency signal into the diffuser simulation source through a trench radio frequency cable of a microwave darkroom to form a reflected space radiation signal; s2, establishing an array distributed receiving antenna group, receiving a space radiation signal of a scatterer simulation source, and performing frequency shift processing on the received radio frequency signal; s3, amplifying the radiation signal by using a time delay measuring device, and performing phase measurement after down-converting the radiation signal to an intermediate frequency signal to obtain a rising edge envelope curve; s4, calculating and analyzing the measurement result by using calibration software of the industrial personal computer, and automatically measuring the time from the central position of the rising edge envelope curve to the middle position of the rising edge of the synchronous signal, wherein the time deduction initial delay is the delay value of the tested system; s5, automatically calibrating according to the calculation result.
Description
Technical Field
The invention relates to the field of space positioning, in particular to a space angular position parameter calibration method.
Background
The current special measuring equipment comprises a scatterer analog source, a radiation source, a target array and a feed system, and has a calibration method for some conventional technical indexes, but has high requirements for some technical indexes, and lacks a reliable metering calibration method reference. At present, for the condition of larger distance, the time interval is longer, the oscilloscope is required to have longer storage depth, so that the sampling rate is reduced, and meanwhile, the oscilloscope is influenced by the time base of the oscilloscope and the rising time of the detector, the edge ambiguity is high, so that the measurement accuracy is not high.
Disclosure of Invention
The present invention is directed to a method for calibrating spatial angular position parameters, so as to solve the problems set forth in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a space angular position parameter calibration method comprises the following specific steps:
s1, simulating the speed of a moving target by a diffuser simulation source to be calibrated, outputting a radio frequency signal by a signal source, and directly accessing the radio frequency signal into the diffuser simulation source through a trench radio frequency cable of a microwave darkroom to form a reflected space radiation signal;
s2, establishing an array distribution receiving antenna group, arranging and distributing the receiving antenna group according to a triplet layout form, receiving a space radiation signal of a scatterer simulation source by using the receiving antenna group, and performing frequency shift processing on the received radio frequency signal to complete the simulation of Doppler frequency offset of a radar echo signal and obtain a space angle position parameter to be calibrated;
s3, amplifying the radiation signal by using a time delay measuring device, and performing phase measurement after down-converting the radiation signal to an intermediate frequency signal to obtain a rising edge envelope curve;
s4, calculating and analyzing the measurement result by using calibration software of the industrial personal computer, and automatically measuring the time from the central position of the rising edge envelope curve to the middle position of the rising edge of the synchronous signal, wherein the time deduction initial delay is the delay value of the tested system;
s5, automatically calibrating according to the calculation result.
Preferably, in step S1, a high-stability vibration locked by an atomic clock is used as a signal source.
Preferably, in step S2, the specific array arrangement manner of the receiving antenna group is as follows: 319 radio frequency radiating elements are arranged into an array, every three radio frequency radiating elements in the array are arranged according to an equilateral triangle to form a subarray, the subarray is defined as a triplet, and the target analog signal is formed by spatially synthesizing signals radiated by adjacent three elements on the array.
Preferably, in step S3, the delay measurement device is composed of a time interval generator, a down-conversion component, a high-speed acquisition module and a signal processing component, where each component cooperates with the signal processing component to specifically:
s31, generating two paths of synchronous signals by a time interval generator, wherein one path of synchronous signals synchronously trigger a signal source, and the other path of synchronous signals are used as reference signals for time delay measurement and are sent to a high-speed acquisition module for acquisition;
s32, the signal source is used as an excitation signal to generate a pulse modulation signal required by a calibrated system, and the pulse modulation signal is sent to the scatterer simulation source to obtain a reflected space radiation signal;
s33, the down-conversion component converts the received signals to intermediate frequency signals in a bandwidth range and an amplitude range which can be achieved by the high-speed acquisition module;
s34, the high-speed acquisition module finishes signal sampling in a high sampling rate mode, and the undistorted A/D conversion of the pulse modulation signal and the synchronous signal is carried out to convert the required pulse modulation signal and synchronous signal into discrete digital quantity;
s35, accurately extracting the pulse signal envelope by the signal processing component to form a steep rising edge envelope curve, and obtaining a smooth and low-jitter pulse edge.
Preferably, in step S31, the time interval between the generation of the two synchronous signals by the time interval generator is arbitrarily set, so as to convert the millisecond-level delay into the microsecond-level delay.
Preferably, the high-speed acquisition module comprises an A/D conversion module, a sampling clock module and a digital storage module, and the specific working mode is as follows: the signal to be tested is sent to the front-end amplifier after passing through the coupling circuit and converted into a voltage range which can be received by the ADC, the sampling and holding circuit divides the signal into independent sampling levels according to a fixed sampling rate, and the A/D conversion module converts the signal into a digital sampling point and stores the signal in a digital form.
Preferably, the device also comprises a calibration device, wherein the calibration device comprises a precise calibration turntable, an angular position calibration channel component, a vector network analyzer and an industrial personal computer with calibration software, and the specific working modes are as follows: the precise calibration turntable receives instructions, performs rotation adjustment of azimuth and pitching angles, receives array radiation signals by a receiving antenna, amplifies and down-converts the array radiation signals to intermediate frequency signals through an angular position calibration channel component, returns the intermediate frequency signals to a vector network analyzer, performs phase measurement, and sends measurement results to an industrial personal computer for calculation and analysis of calibration results.
Preferably, the angular position calibration channel assembly is a four-ridge horn antenna, a single pole 4 throw microwave switch, a mixer, an intermediate frequency amplifier, and an isolator, wherein: the four-ridge horn antenna is used for receiving high-frequency signals radiated by the array surface; the single-pole 4-throw microwave switch is used for controlling the measuring mode; the mixer down-converts the signals received by the antenna into intermediate frequency signals of 70MHz and sends the intermediate frequency signals to the narrow-band intermediate frequency amplifier for amplification; the intermediate frequency amplifier amplifies the signal and performs matched filtering; the isolator is used for preventing interference between two received microwave signals, so that the measurement result is inaccurate.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention firstly down-converts the pulse modulation signal to below 1GHz, after conditioning the signal, the signal sampling is finished by adopting a high sampling rate mode, and the high-precision measurement of the time delay is realized by precisely acquiring smooth and low-jitter pulse edges of the pulse signal envelope.
2. According to the invention, the speed of a moving hundred marks is simulated by using a scatterer simulation source, the received radio frequency signal is subjected to frequency shift processing, and the simulation of Doppler frequency offset of a radar echo signal is completed; and conditioning and amplifying the received signals, accurately calibrating each receiving component and each receiving device, establishing a complete tracing chain, and ensuring accurate and reliable magnitude.
3. The invention adopts the high sampling rate chip, avoids the impact level noise caused by the interval sampling of a plurality of chips, and ensures the consistency of high sampling signals; the method has the advantages of low overall cost, good stability and low interference, and can obtain accurate calibration measurement results.
Drawings
FIG. 1 is a schematic diagram showing the specific components of a calibration device according to the present invention;
fig. 2 is a schematic layout diagram of a receiving antenna set according to the present invention;
FIG. 3 is a schematic diagram illustrating the operation of the high-speed acquisition module of the present invention;
fig. 4 is a schematic diagram of the operation of the time delay measuring device of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", and the like,
Referring to fig. 1-4, the present invention provides a technical solution: a space angular position parameter calibration method comprises the following specific steps:
s1, simulating the speed of a moving target by a diffuser simulation source to be calibrated, outputting a radio frequency signal by a signal source, and directly accessing the radio frequency signal into the diffuser simulation source through a trench radio frequency cable of a microwave darkroom to form a reflected space radiation signal;
s2, establishing an array distribution receiving antenna group, arranging and distributing the receiving antenna group according to a triplet layout form, receiving a space radiation signal of a scatterer simulation source by using the receiving antenna group, and performing frequency shift processing on the received radio frequency signal to complete the simulation of Doppler frequency offset of a radar echo signal and obtain a space angle position parameter to be calibrated;
the simulation of the spatial angular position is realized by controlling the synthesized beam of the array antenna, as shown in fig. 2, the specific array arrangement mode of the receiving antenna group is as follows: 319 radio frequency radiating elements are arranged into an array, every three radio frequency radiating elements in the array are arranged according to an equilateral triangle to form a subarray, the subarray is defined as a triplet, and a target analog signal is formed by spatially synthesizing signals radiated by three adjacent elements on the array; the radiation signals of the triplets are transferred from one triplet to another by the radio frequency switch matrix, the program controlled attenuator and the phase shifter, thereby realizing the change of the spatial angular position of the target signals.
S3, amplifying the radiation signal by using a time delay measuring device, and performing phase measurement after down-converting the radiation signal to an intermediate frequency signal to obtain a rising edge envelope curve;
the time delay measuring device consists of a time interval generator, a down-conversion assembly, a high-speed acquisition module and a signal processing assembly, wherein the assemblies are matched to perform signal processing, and the time delay measuring device specifically comprises:
s31, generating two paths of synchronous signals by a time interval generator, wherein one path of synchronous signals synchronously trigger a signal source, and the other path of synchronous signals are used as reference signals for time delay measurement and are sent to a high-speed acquisition module for acquisition; the time interval between the two synchronous signals generated by the time interval generator can be set arbitrarily, and the time interval generator is used for converting millisecond-level time delay into microsecond-level time delay.
S32, the signal source is used as an excitation signal to generate a pulse modulation signal required by a calibrated system, and the pulse modulation signal is sent to the scatterer simulation source to obtain a reflected space radiation signal;
s33, the down-conversion component converts the received signals to intermediate frequency signals in a bandwidth range and an amplitude range which can be achieved by the high-speed acquisition module;
s34, the high-speed acquisition module finishes signal sampling in a high sampling rate mode, and the undistorted A/D conversion of the pulse modulation signal and the synchronous signal is carried out to convert the required pulse modulation signal and synchronous signal into discrete digital quantity; the high-speed acquisition module comprises an A/D conversion module, a sampling clock module and a digital storage module, and the specific working mode is as follows: the signal to be tested is sent to a front-end amplifier after passing through a coupling circuit and is converted into a voltage range which can be received by an ADC, a sampling and holding circuit divides the signal into independent sampling levels according to a fixed sampling rate, an A/D conversion module converts the signal into a digital sampling point, and the signal is stored in a digital form; the chip with the sampling rate of 5GS/s is adopted, so that impact level noise caused by interval sampling of a plurality of chips is avoided, and the consistency of high-sampling signals is ensured.
S35, accurately extracting the pulse signal envelope by the signal processing component to form a steep rising edge envelope curve, and obtaining a smooth and low-jitter pulse edge.
S4, calculating and analyzing the measurement result by using calibration software of the industrial personal computer, and automatically measuring the time from the central position of the rising edge envelope curve to the middle position of the rising edge of the synchronous signal, wherein the time deduction initial delay is the delay value of the tested system;
s5, automatically calibrating according to the calculation result: the phase difference of the signals is measured, the spatial angular position is calculated, and the calibration device completes automatic calibration under the control of calibration software.
The calibration device comprises a precise calibration turntable, an angular position calibration channel component, a vector network analyzer and an industrial personal computer with calibration software, and the specific working mode is as follows: the precise calibration turntable receives instructions, performs rotation adjustment of azimuth and pitching angles, receives array radiation signals by a receiving antenna, amplifies and down-converts the array radiation signals to intermediate frequency signals through an angular position calibration channel component, returns the intermediate frequency signals to a vector network analyzer, performs phase measurement, and sends measurement results to an industrial personal computer for calculation and analysis of calibration results.
The angular position calibration channel assembly four-ridge horn antenna, a single-pole 4-throw microwave switch, a mixer, an intermediate frequency amplifier and an isolator, wherein: the four-ridge horn antenna is used for receiving high-frequency signals radiated by the array surface; the single-pole 4-throw microwave switch is used for controlling the measuring mode; the mixer down-converts the signals received by the antenna into intermediate frequency signals of 70MHz and sends the intermediate frequency signals to the narrow-band intermediate frequency amplifier for amplification; the intermediate frequency amplifier has lower cost than the microwave amplifier, high gain and good stability, and is easy to carry out matched filtering on signals, thereby obtaining higher sensitivity; the isolator is used for preventing interference between two received microwave signals, so that the measurement result is inaccurate.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The method for calibrating the spatial angular position parameter is characterized by comprising the following specific steps:
s1, simulating the speed of a moving target by a diffuser simulation source to be calibrated, outputting a radio frequency signal by a signal source, and directly accessing the radio frequency signal into the diffuser simulation source through a trench radio frequency cable of a microwave darkroom to form a reflected space radiation signal;
s2, establishing an array distribution receiving antenna group, arranging and distributing the receiving antenna group according to a triplet layout form, receiving a space radiation signal of a scatterer simulation source by using the receiving antenna group, and performing frequency shift processing on the received radio frequency signal to complete the simulation of Doppler frequency offset of a radar echo signal and obtain a space angle position parameter to be calibrated;
s3, amplifying the radiation signal by using a time delay measuring device, and performing phase measurement after down-converting the radiation signal to an intermediate frequency signal to obtain a rising edge envelope curve;
in step S3, the delay measurement device is composed of a time interval generator, a down-conversion component, a high-speed acquisition module and a signal processing component, and the components cooperate to perform signal processing, specifically:
s31, generating two paths of synchronous signals by a time interval generator, wherein one path of synchronous signals synchronously trigger a signal source, and the other path of synchronous signals are used as reference signals for time delay measurement and are sent to a high-speed acquisition module for acquisition;
s32, the signal source is used as an excitation signal to generate a pulse modulation signal required by a calibrated system, and the pulse modulation signal is sent to the scatterer simulation source to obtain a reflected space radiation signal;
s33, the down-conversion component converts the received signals to intermediate frequency signals in a bandwidth range and an amplitude range which can be achieved by the high-speed acquisition module;
s34, the high-speed acquisition module finishes signal sampling in a high sampling rate mode, and the undistorted A/D conversion of the pulse modulation signal and the synchronous signal is carried out to convert the required pulse modulation signal and synchronous signal into discrete digital quantity;
s35, accurately extracting the envelope of the pulse signal by a signal processing component to form a steep rising edge envelope curve, and acquiring a smooth and low-jitter pulse edge;
s4, calculating and analyzing the measurement result by using calibration software of the industrial personal computer, and automatically measuring the time from the central position of the rising edge envelope curve to the middle position of the rising edge of the synchronous signal, wherein the time deduction initial delay is the delay value of the tested system;
s5, automatically calibrating according to the calculation result.
2. A method of calibrating a spatial angular position parameter according to claim 1, wherein: in step S1, a high-stability product vibration locked by an atomic clock is used as a signal source.
3. A method of calibrating a spatial angular position parameter according to claim 1, wherein: in step S2, the specific array arrangement manner of the receiving antenna group is as follows: 319 radio frequency radiating elements are arranged into an array, every three radio frequency radiating elements in the array are arranged according to an equilateral triangle to form a subarray, the subarray is defined as a triplet, and the target analog signal is formed by spatially synthesizing signals radiated by adjacent three elements on the array.
4. A method of calibrating a spatial angular position parameter according to claim 1, wherein: in step S31, the time interval between the two synchronous signals generated by the time interval generator can be arbitrarily set, so as to transform the millisecond delay into the microsecond delay.
5. A method of calibrating a spatial angular position parameter according to claim 1, wherein: the high-speed acquisition module comprises an A/D conversion module, a sampling clock module and a digital storage module, and the specific working mode is as follows: the signal to be tested is sent to the front-end amplifier after passing through the coupling circuit and converted into a voltage range which can be received by the ADC, the sampling and holding circuit divides the signal into independent sampling levels according to a fixed sampling rate, and the A/D conversion module converts the signal into a digital sampling point and stores the signal in a digital form.
6. A method of calibrating a spatial angular position parameter according to claim 1, wherein: the calibration device comprises a precise calibration turntable, an angular position calibration channel component, a vector network analyzer and an industrial personal computer with calibration software, and the specific working mode is as follows: the precise calibration turntable receives instructions, performs rotation adjustment of azimuth and pitching angles, receives array radiation signals by a receiving antenna, amplifies and down-converts the array radiation signals to intermediate frequency signals through an angular position calibration channel component, returns the intermediate frequency signals to a vector network analyzer, performs phase measurement, and sends measurement results to an industrial personal computer for calculation and analysis of calibration results.
7. A method of calibrating a spatial angular position parameter according to claim 6, wherein: the angular position calibration channel assembly four-ridge horn antenna, a single-pole 4-throw microwave switch, a mixer, an intermediate frequency amplifier and an isolator, wherein: the four-ridge horn antenna is used for receiving high-frequency signals radiated by the array surface; the single-pole 4-throw microwave switch is used for controlling the measuring mode; the mixer down-converts the signals received by the antenna into intermediate frequency signals of 70MHz and sends the intermediate frequency signals to the narrow-band intermediate frequency amplifier for amplification; the intermediate frequency amplifier amplifies the signal and performs matched filtering; the isolator is used for preventing interference between two received microwave signals, so that the measurement result is inaccurate.
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| CN115267664B (en) * | 2022-08-01 | 2023-10-20 | 北京中科睿信科技有限公司 | Plane radio frequency simulation array calibration equipment and method |
| CN117491745B (en) * | 2024-01-02 | 2024-05-17 | 中国科学技术大学 | Pulse signal time and charge measurement method and device |
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