CN108333557B - Phase calibration system and method of multi-channel direction finding receiver - Google Patents
Phase calibration system and method of multi-channel direction finding receiver Download PDFInfo
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- CN108333557B CN108333557B CN201810098762.8A CN201810098762A CN108333557B CN 108333557 B CN108333557 B CN 108333557B CN 201810098762 A CN201810098762 A CN 201810098762A CN 108333557 B CN108333557 B CN 108333557B
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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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/023—Monitoring or calibrating
Abstract
The invention discloses a phase calibration system and method of a multi-channel direction finding receiver, wherein the system comprises a signal processing module, a storage module, a calibration antenna and a plurality of signal receiving components, and the front end of each signal receiving component is provided with a corresponding signal receiving antenna; the signal receiving components comprise filters, amplitude limiters, SP2T switches, frequency conversion channels and ADC modules, wherein the frequency conversion channel of one signal receiving component is a reference channel, and the frequency conversion channels of other signal receiving components are phase measurement channels; and the signal processing module is used for controlling the generation of the signal of the calibration source and the switching of the SP2T switch, processing the received signal and acquiring the phase correction table at different temperatures. The invention can generate the phase correction table of the signal receiving component where each phase measurement channel is located at different temperatures for phase calibration in the direction measurement process, thereby improving the phase calibration precision and ensuring the direction measurement performance of the receiver.
Description
Technical Field
The invention relates to the field of communication direction finding, in particular to a phase calibration system and method of a multi-channel direction finding receiver.
Background
The modern reconnaissance direction-finding receiver has the characteristics of wide working frequency band and high frequency point, is limited by the existing analog-to-digital conversion (ADC) device from hundreds of MHz to dozens of GHz, cannot be directly subjected to digital processing at the rear end of an antenna, generally adopts a method that a superheterodyne receiver is adopted to down-convert a radio-frequency signal from the antenna to an intermediate frequency and then process the intermediate-frequency signal, the intermediate-frequency signal reaching a phase discrimination module part passes through a plurality of modules such as an antenna unit, a radio-frequency channel, a frequency conversion channel and the like, no matter the front-end antenna and the radio-frequency channel, or microwave devices such as frequency mixing, filtering, amplifying and the like in the frequency conversion channel, the consistency of the frequency phase and amplitude phase characteristics is limited, and the difference of the length of local;
in engineering implementation, the inter-channel phase characteristics are not completely consistent, which may cause serious degradation of the direction-finding performance of the direction-finding device, and therefore, performing phase calibration in a multi-channel direction-finding receiver is crucial to ensuring the working accuracy of the receiver.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a phase calibration system and a phase calibration method of a multi-channel direction-finding receiver, which can generate a phase calibration table of a signal receiving component where each phase-finding channel is located at different temperatures for phase calibration in the direction-finding process, improve the phase calibration precision and ensure the direction-finding performance of the receiver.
The purpose of the invention is realized by the following technical scheme: a phase calibration system of a multi-channel direction finding receiver comprises a signal processing module, a storage module, a calibration antenna and a plurality of signal receiving components, wherein the front end of each signal receiving component is provided with a corresponding signal receiving antenna;
the signal receiving assembly comprises a filter, an amplitude limiter, an SP2T switch, a frequency conversion channel and an ADC module, wherein the input end of the filter is connected with a corresponding signal receiving antenna, the output end of the filter is connected with the first signal input end of the SP2T switch through the amplitude limiter, the second signal input end of the SP2T switch is connected with the calibration module, the control input end of the SP2T switch is connected with the signal processing module, and the output end of the SP2T switch is connected with the signal processing module sequentially through the frequency conversion channel and the ADC module; the signal processing module is also respectively connected with the calibration module and the storage module, and the output end of the calibration module is also connected with the calibration antenna;
in the multiple signal receiving assemblies, the frequency conversion channel of one signal receiving assembly is a reference channel, and the frequency conversion channels of other signal receiving assemblies are phase measurement channels;
the calibration module is used for generating calibration signals under the control of the signal processing module and transmitting the calibration signals to the calibration antenna and each signal receiving component;
and the signal processing module is used for controlling the generation of signals of the calibration source and the switching of the SP2T switch, processing the received signals, acquiring phase correction tables at different temperatures, and storing the phase correction tables in the storage module for phase calibration in the direction finding process.
The calibration module comprises a calibration source and a power divider, the calibration source is connected with the signal processing module and used for generating calibration signals under the control of the signal processing module, the output end of the calibration source is respectively connected with the calibration antenna and the power divider, and the output end of the power divider is respectively connected with the second signal input end of the SP2T switch in each signal receiving component.
The signal processing module includes: the calibration source control unit is used for controlling the calibration source to generate a calibration signal; a switch control unit for controlling switching of the SP2T switch in each signal receiving component; the internal circulation calibration unit is used for carrying out phase discrimination on signals output by the ADC module of the reference channel and the phase measurement channel at different temperatures when the SP2T switch is switched to the second signal input end to obtain phase errors of the phase measurement channels at different temperatures so as to form an internal circulation calibration table, and the internal circulation calibration table is stored in the storage module; the external circulation calibration unit is used for carrying out phase discrimination on signals output by the reference channel and the phase measurement channel through the ADC module in a darkroom when the SP2T is switched to the first signal input end to obtain phase errors of signal receiving assemblies where the phase measurement channels are located at the current temperature so as to form an external circulation calibration table, and the external circulation calibration table is stored in the storage module; and the temperature compensation unit is used for compensating the internal circulation calibration table by utilizing the external circulation calibration table to obtain the phase errors of the signal receiving assemblies where the phase measurement channels are located at different temperatures, generating phase correction tables at different temperatures, and storing the phase correction tables in the storage module for phase calibration in the direction measurement process.
The frequency conversion channel comprises a frequency mixing unit and an amplifying unit of a filtering unit, the input end of the frequency mixing unit is connected with the SP2T switch, and the output end of the frequency mixing unit is connected with the ADC module sequentially through the filtering unit and the amplifying unit. The signal processing module adopts an FPGA processor. The storage module adopts a Nand-flash memory.
The phase calibration method of the phase calibration system of the multi-channel direction finding receiver comprises the following steps:
s1, internal circulation calibration: the signal processing module controls the calibration source to generate dot frequency modulation pulse signals in a working frequency band, simultaneously controls the SP2T switch of each signal receiving component to be switched to a second signal input end, calculates according to the received signals at different temperatures to obtain phase errors of each phase measurement channel at different temperatures, generates an internal circulation calibration table and stores the internal circulation calibration table in the storage module;
s2, external circulation calibration: the signal processing module controls the calibration source to generate dot frequency modulation pulse signals in a working frequency range, simultaneously controls the SP2T switch of each signal receiving component to be switched to a first signal input end, under a darkroom environment, calculates according to the received signals to obtain the phase error of the signal receiving component where each phase measurement channel is located at the current temperature, generates an external circulation calibration table, and stores the external circulation calibration table in the storage module;
s3, temperature compensation: the signal processing module compensates the inner circulation calibration table by utilizing the outer circulation calibration table to obtain phase errors of the signal receiving assemblies where the phase measurement channels are located at different temperatures, and phase correction tables at different temperatures are generated and stored in the storage module for phase calibration in the direction measurement process.
Wherein the step S1 includes the following substeps:
the signal processing module controls the calibration source to generate a dot frequency modulation pulse signal in a working frequency band, and the step is performed by 1 MHZ;
the signal processing module controls the SP2T switch of each signal receiving assembly to be switched to a second signal input end, and signals generated by the calibration source pass through the power divider, respectively enter the frequency conversion channel of each signal receiving assembly through the SP2T switch, and are transmitted to the signal processing module through the ADC module;
and at different temperatures, the signal processing module performs phase discrimination on signals output by the ADC module from the reference channel and each phase measurement channel, calculates the phase difference between each phase measurement channel and the reference channel, namely the phase error of each phase measurement channel, generates an internal circulation calibration table, and stores the internal circulation calibration table in the storage module, wherein the internal circulation calibration table comprises the phase errors of each phase measurement channel at different temperatures.
Wherein the step S2 includes the following substeps:
the signal processing module controls the calibration source to generate a dot frequency modulation pulse signal in a working frequency band, and the step is performed by 1 MHZ;
the signal processing module controls the SP2T switch of each signal receiving component to be switched to a first signal input end, and signals generated by the calibration source are transmitted through the calibration antenna;
each signal receiving assembly receives signals transmitted by the calibration antenna through a corresponding signal receiving antenna, the signals are transmitted to the SP2T switch through a filter and an amplitude limiter, the frequency conversion channel of the signal receiving assembly is carried out through the first input end of the SP2T switch, and the signals are transmitted to the signal processing module through the ADC module;
the signal processing module performs phase discrimination on signals output by the ADC module of the reference channel and each phase measurement channel, calculates the phase difference between a signal receiving assembly where the reference channel is located and a signal receiving assembly where each phase measurement channel is located at the current temperature, namely the phase error of the signal receiving assembly where each phase measurement channel is located, generates an external circulation calibration table, and stores the external circulation calibration table in the storage module; the external circulation calibration table comprises phase errors of signal receiving components where the phase measurement channels are located at the current temperature.
Wherein the step S3 includes the following substeps:
the signal processing module subtracts the phase error of each phase measurement channel from the phase error of the signal receiving component where the phase measurement channel is located at the same temperature by using the information in the internal circulation calibration table and the external circulation calibration table to obtain a difference value corresponding to each phase measurement channel, namely the phase error caused by a signal receiving antenna, a filter and an amplitude limiter corresponding to the phase measurement channel;
for each phase measurement channel, the signal processing module compensates the information in the internal circulation calibration table at each temperature according to the calculated difference value to obtain the phase error of the signal receiving assembly where each phase measurement channel is located at different temperatures, and phase correction tables at different temperatures are generated and stored in the storage module for phase calibration in the direction measurement process.
The invention has the beneficial effects that: the invention can generate the phase correction table of the signal receiving component where each phase measurement channel is located at different temperatures for phase calibration in the direction measurement process, thereby improving the phase calibration precision and ensuring the direction measurement performance of the receiver.
Drawings
FIG. 1 is a schematic block diagram of the system of the present invention;
FIG. 2 is a flow chart of the method of the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1, a phase calibration system of a multi-channel direction finding receiver includes a signal processing module, a storage module, a calibration antenna, and a plurality of signal receiving components, where a corresponding signal receiving antenna is disposed at a front end of each signal receiving component;
the signal receiving assembly comprises a filter, an amplitude limiter, an SP2T switch, a frequency conversion channel and an ADC module, wherein the input end of the filter is connected with a corresponding signal receiving antenna, the output end of the filter is connected with the first signal input end of the SP2T switch through the amplitude limiter, the second signal input end of the SP2T switch is connected with the calibration module, the control input end of the SP2T switch is connected with the signal processing module, and the output end of the SP2T switch is connected with the signal processing module sequentially through the frequency conversion channel and the ADC module; the signal processing module is also respectively connected with the calibration module and the storage module, and the output end of the calibration module is also connected with the calibration antenna;
in the multiple signal receiving assemblies, the frequency conversion channel of one signal receiving assembly is a reference channel, and the frequency conversion channels of other signal receiving assemblies are phase measurement channels;
the calibration module is used for generating calibration signals under the control of the signal processing module and transmitting the calibration signals to the calibration antenna and each signal receiving component;
and the signal processing module is used for controlling the generation of signals of the calibration source and the switching of the SP2T switch, processing the received signals, acquiring phase correction tables at different temperatures, and storing the phase correction tables in the storage module for phase calibration in the direction finding process.
The calibration module comprises a calibration source and a power divider, the calibration source is connected with the signal processing module and used for generating calibration signals under the control of the signal processing module, the output end of the calibration source is respectively connected with the calibration antenna and the power divider, and the output end of the power divider is respectively connected with the second signal input end of the SP2T switch in each signal receiving component.
The signal processing module includes: the calibration source control unit is used for controlling the calibration source to generate a calibration signal; a switch control unit for controlling switching of the SP2T switch in each signal receiving component; the internal circulation calibration unit is used for carrying out phase discrimination on signals output by the ADC module of the reference channel and the phase measurement channel at different temperatures when the SP2T switch is switched to the second signal input end to obtain phase errors of the phase measurement channels at different temperatures so as to form an internal circulation calibration table, and the internal circulation calibration table is stored in the storage module; the external circulation calibration unit is used for carrying out phase discrimination on signals output by the reference channel and the phase measurement channel through the ADC module in a darkroom when the SP2T is switched to the first signal input end to obtain phase errors of signal receiving assemblies where the phase measurement channels are located at the current temperature so as to form an external circulation calibration table, and the external circulation calibration table is stored in the storage module; and the temperature compensation unit is used for compensating the internal circulation calibration table by utilizing the external circulation calibration table to obtain the phase errors of the signal receiving assemblies where the phase measurement channels are located at different temperatures, generating phase correction tables at different temperatures, and storing the phase correction tables in the storage module for phase calibration in the direction measurement process.
The frequency conversion channel comprises a frequency mixing unit and an amplifying unit of a filtering unit, the input end of the frequency mixing unit is connected with the SP2T switch, and the output end of the frequency mixing unit is connected with the ADC module sequentially through the filtering unit and the amplifying unit. The signal processing module adopts an FPGA processor. The storage module adopts a Nand-flash memory.
As shown in fig. 2, the phase calibration method of the phase calibration system of the multi-channel direction finding receiver includes the following steps:
s1, internal circulation calibration: the signal processing module controls the calibration source to generate dot frequency modulation pulse signals in a working frequency band, simultaneously controls the SP2T switch of each signal receiving component to be switched to a second signal input end, calculates according to the received signals at different temperatures to obtain phase errors of each phase measurement channel at different temperatures, generates an internal circulation calibration table and stores the internal circulation calibration table in the storage module;
s2, external circulation calibration: the signal processing module controls the calibration source to generate dot frequency modulation pulse signals in a working frequency range, simultaneously controls the SP2T switch of each signal receiving component to be switched to a first signal input end, under a darkroom environment, calculates according to the received signals to obtain the phase error of the signal receiving component where each phase measurement channel is located at the current temperature, generates an external circulation calibration table, and stores the external circulation calibration table in the storage module;
s3, temperature compensation: the signal processing module compensates the inner circulation calibration table by utilizing the outer circulation calibration table to obtain phase errors of the signal receiving assemblies where the phase measurement channels are located at different temperatures, and phase correction tables at different temperatures are generated and stored in the storage module for phase calibration in the direction measurement process.
Wherein the step S1 includes the following substeps:
the signal processing module controls the calibration source to generate a dot frequency modulation pulse signal in a working frequency band, and the step is performed by 1 MHZ;
the signal processing module controls the SP2T switch of each signal receiving assembly to be switched to a second signal input end, and signals generated by the calibration source pass through the power divider, respectively enter the frequency conversion channel of each signal receiving assembly through the SP2T switch, and are transmitted to the signal processing module through the ADC module;
and at different temperatures, the signal processing module performs phase discrimination on signals output by the ADC module from the reference channel and each phase measurement channel, calculates the phase difference between each phase measurement channel and the reference channel, namely the phase error of each phase measurement channel, generates an internal circulation calibration table, and stores the internal circulation calibration table in the storage module, wherein the internal circulation calibration table comprises the phase errors of each phase measurement channel at different temperatures.
Wherein the step S2 includes the following substeps:
the signal processing module controls the calibration source to generate a dot frequency modulation pulse signal in a working frequency band, and the step is performed by 1 MHZ;
the signal processing module controls the SP2T switch of each signal receiving component to be switched to a first signal input end, and signals generated by the calibration source are transmitted through the calibration antenna;
each signal receiving assembly receives signals transmitted by the calibration antenna through a corresponding signal receiving antenna, the signals are transmitted to the SP2T switch through a filter and an amplitude limiter, the frequency conversion channel of the signal receiving assembly is carried out through the first input end of the SP2T switch, and the signals are transmitted to the signal processing module through the ADC module;
the signal processing module performs phase discrimination on signals output by the ADC module of the reference channel and each phase measurement channel, calculates the phase difference between a signal receiving assembly where the reference channel is located and a signal receiving assembly where each phase measurement channel is located at the current temperature, namely the phase error of the signal receiving assembly where each phase measurement channel is located, generates an external circulation calibration table, and stores the external circulation calibration table in the storage module; the external circulation calibration table comprises phase errors of signal receiving components where the phase measurement channels are located at the current temperature.
Wherein the step S3 includes the following substeps:
the signal processing module subtracts the phase error of each phase measurement channel from the phase error of the signal receiving component where the phase measurement channel is located at the same temperature by using the information in the internal circulation calibration table and the external circulation calibration table to obtain a difference value corresponding to each phase measurement channel, namely the phase error caused by a signal receiving antenna, a filter and an amplitude limiter corresponding to the phase measurement channel;
for each phase measurement channel, the signal processing module compensates the information in the internal circulation calibration table at each temperature according to the calculated difference value to obtain the phase error of the signal receiving assembly where each phase measurement channel is located at different temperatures, and phase correction tables at different temperatures are generated and stored in the storage module for phase calibration in the direction measurement process.
In the embodiment of the application, the calibration temperature of the external circulation calibration table is T1, and includes the phase error of the signal receiving component where each phase measurement channel is located at the temperature of T1; if the internal circulation calibration table includes phase errors of the phase measurement channels at a plurality of temperatures of T1, T2, T3 and … Tn, the same temperature in the step S3 is the temperature T1; only the phase error of each phase measurement channel is subtracted from the phase error of the signal receiving component where the phase measurement channel is located at the temperature of T1, so as to obtain the difference value corresponding to each phase measurement channel, namely the phase error caused by the signal receiving antenna, the filter and the amplitude limiter corresponding to the phase measurement channel; and then in the internal circulation calibration table, firstly, the phase errors of the phase measurement channels at the temperature of T2 in the internal circulation calibration table are added with the difference values calculated by the corresponding phase measurement channels to obtain the phase errors of the signal receiving assemblies at the temperature of T2, and the phase errors of the signal receiving assemblies at the temperature of T3 to Tn in the same way are obtained to obtain a final phase correction table, wherein the table can be used for accurately finishing phase calibration in the direction measurement process.
In conclusion, the invention can generate the phase correction table of the signal receiving component where each phase measurement channel is located at different temperatures for phase correction in the direction finding process, thereby avoiding the influence of the temperature on the phase consistency of the signal receiving component where each phase measurement channel is located, improving the phase correction precision and ensuring the direction finding performance of the receiver.
Claims (9)
1. A phase calibration system for a multi-channel direction-finding receiver, comprising: the signal calibration device comprises a signal processing module, a storage module, a calibration antenna and a plurality of signal receiving components, wherein the front end of each signal receiving component is provided with a corresponding signal receiving antenna;
the signal receiving assembly comprises a filter, an amplitude limiter, an SP2T switch, a frequency conversion channel and an ADC module, wherein the input end of the filter is connected with a corresponding signal receiving antenna, the output end of the filter is connected with the first signal input end of the SP2T switch through the amplitude limiter, the second signal input end of the SP2T switch is connected with the calibration module, the control input end of the SP2T switch is connected with the signal processing module, and the output end of the SP2T switch is connected with the signal processing module sequentially through the frequency conversion channel and the ADC module; the signal processing module is also respectively connected with the calibration module and the storage module, and the output end of the calibration module is also connected with the calibration antenna;
in the multiple signal receiving assemblies, the frequency conversion channel of one signal receiving assembly is a reference channel, and the frequency conversion channels of other signal receiving assemblies are phase measurement channels;
the calibration module is used for generating calibration signals under the control of the signal processing module and transmitting the calibration signals to the calibration antenna and each signal receiving component;
the signal processing module is used for controlling the generation of signals of a calibration source and the switching of an SP2T switch, processing the received signals, acquiring phase correction tables at different temperatures, and storing the phase correction tables in the storage module for phase calibration in the direction finding process;
the signal processing module includes:
the calibration source control unit is used for controlling the calibration source to generate a calibration signal;
a switch control unit for controlling switching of the SP2T switch in each signal receiving component;
the internal circulation calibration unit is used for carrying out phase discrimination on signals output by the ADC module of the reference channel and the phase measurement channel at different temperatures when the SP2T switch is switched to the second signal input end to obtain phase errors of the phase measurement channels at different temperatures so as to form an internal circulation calibration table, and the internal circulation calibration table is stored in the storage module;
the external circulation calibration unit is used for carrying out phase discrimination on signals output by the reference channel and the phase measurement channel through the ADC module in a darkroom when the SP2T is switched to the first signal input end to obtain phase errors of signal receiving assemblies where the phase measurement channels are located at the current temperature so as to form an external circulation calibration table, and the external circulation calibration table is stored in the storage module;
and the temperature compensation unit is used for compensating the internal circulation calibration table by utilizing the external circulation calibration table to obtain the phase errors of the signal receiving assemblies where the phase measurement channels are located at different temperatures, generating phase correction tables at different temperatures, and storing the phase correction tables in the storage module for phase calibration in the direction measurement process.
2. The system of claim 1, wherein the phase calibration system comprises: the calibration module comprises a calibration source and a power divider, the calibration source is connected with the signal processing module and used for generating calibration signals under the control of the signal processing module, the output end of the calibration source is respectively connected with the calibration antenna and the power divider, and the output end of the power divider is respectively connected with the second signal input end of the SP2T switch in each signal receiving component.
3. The system of claim 1, wherein the phase calibration system comprises: the frequency conversion channel comprises a frequency mixing unit and an amplifying unit of a filtering unit, the input end of the frequency mixing unit is connected with the SP2T switch, and the output end of the frequency mixing unit is connected with the ADC module sequentially through the filtering unit and the amplifying unit.
4. The system of claim 1, wherein the phase calibration system comprises: the signal processing module adopts an FPGA processor.
5. The system of claim 1, wherein the phase calibration system comprises: the storage module adopts a Nand-flash memory.
6. The phase calibration method of the phase calibration system of the multi-channel direction finding receiver according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
s1, internal circulation calibration: the signal processing module controls the calibration source to generate dot frequency modulation pulse signals in a working frequency band, simultaneously controls the SP2T switch of each signal receiving component to be switched to a second signal input end, calculates according to the received signals at different temperatures to obtain phase errors of each phase measurement channel at different temperatures, generates an internal circulation calibration table and stores the internal circulation calibration table in the storage module;
s2, external circulation calibration: the signal processing module controls the calibration source to generate dot frequency modulation pulse signals in a working frequency range, simultaneously controls the SP2T switch of each signal receiving component to be switched to a first signal input end, under a darkroom environment, calculates according to the received signals to obtain the phase error of the signal receiving component where each phase measurement channel is located at the current temperature, generates an external circulation calibration table, and stores the external circulation calibration table in the storage module;
s3, temperature compensation: the signal processing module compensates the inner circulation calibration table by utilizing the outer circulation calibration table to obtain phase errors of the signal receiving assemblies where the phase measurement channels are located at different temperatures, and phase correction tables at different temperatures are generated and stored in the storage module for phase calibration in the direction measurement process.
7. The method of claim 6, wherein the method comprises: the step S1 includes the following sub-steps:
the signal processing module controls the calibration source to generate a dot frequency modulation pulse signal in a working frequency band, and the step is performed by 1 MHZ;
the signal processing module controls the SP2T switch of each signal receiving assembly to be switched to a second signal input end, and signals generated by the calibration source pass through the power divider, respectively enter the frequency conversion channel of each signal receiving assembly through the SP2T switch, and are transmitted to the signal processing module through the ADC module;
and at different temperatures, the signal processing module performs phase discrimination on signals output by the ADC module from the reference channel and each phase measurement channel, calculates the phase difference between each phase measurement channel and the reference channel, namely the phase error of each phase measurement channel, generates an internal circulation calibration table, and stores the internal circulation calibration table in the storage module, wherein the internal circulation calibration table comprises the phase errors of each phase measurement channel at different temperatures.
8. The method of claim 6, wherein the method comprises: the step S2 includes the following sub-steps:
the signal processing module controls the calibration source to generate a dot frequency modulation pulse signal in a working frequency band, and the step is performed by 1 MHZ;
the signal processing module controls the SP2T switch of each signal receiving component to be switched to a first signal input end, and signals generated by the calibration source are transmitted through the calibration antenna;
each signal receiving assembly receives signals transmitted by the calibration antenna through a corresponding signal receiving antenna, the signals are transmitted to the SP2T switch through a filter and an amplitude limiter, the frequency conversion channel of the signal receiving assembly is carried out through the first input end of the SP2T switch, and the signals are transmitted to the signal processing module through the ADC module;
the signal processing module performs phase discrimination on signals output by the ADC module of the reference channel and each phase measurement channel, calculates the phase difference between a signal receiving assembly where the reference channel is located and a signal receiving assembly where each phase measurement channel is located at the current temperature, namely the phase error of the signal receiving assembly where each phase measurement channel is located, generates an external circulation calibration table, and stores the external circulation calibration table in the storage module; the external circulation calibration table comprises phase errors of signal receiving components where the phase measurement channels are located at the current temperature.
9. The method of claim 6, wherein the method comprises: the step S3 includes the following sub-steps:
the signal processing module subtracts the phase error of each phase measurement channel from the phase error of the signal receiving component where the phase measurement channel is located at the same temperature by using the information in the internal circulation calibration table and the external circulation calibration table to obtain a difference value corresponding to each phase measurement channel, namely the phase error caused by a signal receiving antenna, a filter and an amplitude limiter corresponding to the phase measurement channel;
for each phase measurement channel, the signal processing module compensates the information in the internal circulation calibration table at each temperature according to the calculated difference value to obtain the phase error of the signal receiving assembly where each phase measurement channel is located at different temperatures, and phase correction tables at different temperatures are generated and stored in the storage module for phase calibration in the direction measurement process.
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| CN110958062B (en) * | 2018-11-30 | 2022-05-03 | 南京长峰航天电子科技有限公司 | Radio frequency multichannel calibration system and method |
| CN110289920A (en) * | 2019-03-22 | 2019-09-27 | 北京理工雷科电子信息技术有限公司 | A kind of phase alignment of the multi-channel wide with receive-transmit system |
| CN111740789A (en) * | 2020-06-09 | 2020-10-02 | 大富科技(安徽)股份有限公司 | Signal calibration system and method |
| CN112886981B (en) * | 2021-01-25 | 2022-06-03 | 维沃移动通信有限公司 | Radio frequency circuit, electronic equipment and radio frequency control method |
| CN113219396B (en) * | 2021-03-25 | 2022-07-15 | 中国电子科技集团公司第二十九研究所 | Method and system for correcting two-dimensional partition direction-finding channel |
| CN116840759A (en) * | 2023-07-04 | 2023-10-03 | 成都泰格微电子研究所有限责任公司 | Rapid calibration system and method suitable for hybrid integrated circuit test system |
| CN116915272B (en) * | 2023-09-06 | 2023-12-15 | 成都泰格微波技术股份有限公司 | 64-channel phased array system and phase calibration method thereof |
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