CN117031422B - Generalized radar system non-delay full-link internal calibration system and method - Google Patents
Generalized radar system non-delay full-link internal calibration system and method Download PDFInfo
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- CN117031422B CN117031422B CN202311290587.XA CN202311290587A CN117031422B CN 117031422 B CN117031422 B CN 117031422B CN 202311290587 A CN202311290587 A CN 202311290587A CN 117031422 B CN117031422 B CN 117031422B
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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
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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
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4008—Means for monitoring or calibrating of parts of a radar system of transmitters
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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
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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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
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention provides a non-delay full-link internal positioning system and method for a generalized radar system, and belongs to the field of radar calibration. Based on the typical radar system composition, an internal calibration module and a necessary calibration signal coupling and separating circuit are added, so that the system internal calibration function is realized. The calibration module designs a bi-directional multiplexing numerical control attenuator, can keep characteristics under different calibration modes, simplifies system components and improves reliability. Multiplexing of devices in different calibration modes is realized by adopting six optimization measures, and meanwhile, high isolation among a transmitting link, a receiving link and a calibration link is ensured. The invention can realize the emission, receiving and reference calibration of the radar system in the working state with lower cost and system complexity, has the characteristics of simple system composition, comprehensive calibration mode, large dynamic range of calibration signals, high-precision calibration in the full temperature range and the like, and can be applied to various radar systems needing real-time calibration.
Description
Technical Field
The invention belongs to the technical field of radar system calibration, and particularly relates to a non-delay full-link internal calibration system and method for a generalized radar system.
Background
When the radar system works for a long time or the working environment temperature and the like change and fluctuate, the parameter performance of each device in the transmitting and receiving links can change, which leads to the change of the amplitude frequency and phase frequency characteristics of the radar transmitting and receiving links and the deterioration of the system performance. And the internal links of the radar system are calibrated regularly, so that the real amplitude and phase parameters of the links can be extracted. The internal calibration method comprises two types of delay calibration and non-delay calibration, wherein the non-delay calibration does not need additional devices such as optical fibers, the system complexity is low, and meanwhile, extra errors caused by factors such as temperature change of long-distance optical fibers are avoided.
Disclosure of Invention
In order to optimize the signal leakage problem in non-delay calibration and improve the isolation of a receiving-transmitting link, the invention provides a system and a method for calibrating the non-delay full-link of a generalized radar system, which are a system and a method for calibrating the non-delay radar system in a generalized high-precision manner.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a generalized radar system non-delayed full link internal calibration system, comprising: the device comprises an internal calibration module, a first coupler and a second coupler; the internal calibration module comprises a first numerical control attenuator and a second numerical control attenuator which are multiplexed in two directions, a first fixed attenuator, a second fixed attenuator, a first single-pole single-throw switch, a second single-pole single-throw switch, a third single-pole double-throw switch, a fourth single-pole double-throw switch, a fifth single-pole double-throw switch, a sixth single-pole double-throw switch and a seventh single-pole double-throw switch; the internal calibration module is internally provided with a first interface, a second interface and a third interface; the first interface is a common end of a third single-pole double-throw switch, one end of the third single-pole double-throw switch is connected with a second single-pole single-throw switch, the second single-pole single-throw switch is connected with a fourth single-pole double-throw switch, the other end of the third single-pole double-throw switch is connected with a first fixed attenuator, and the first fixed attenuator is connected with a fifth single-pole double-throw switch; the second interface is a common end of a seventh single-pole double-throw switch, one end of the seventh single-pole double-throw switch is connected with a second fixed attenuator, the second fixed attenuator is connected with a sixth single-pole double-throw switch, and the other end of the seventh single-pole double-throw switch is connected with the sixth single-pole double-throw switch; the third interface is one end of the first single-pole single-throw switch, and the other end of the third interface is connected with the fourth single-pole double-throw switch; the public end of the fourth single-pole double-throw switch is connected with the first numerical control attenuator, the first numerical control attenuator is connected with the second numerical control attenuator, the second numerical control attenuator is connected with the public end of the fifth single-pole double-throw switch, one end of the fourth single-pole double-throw switch is connected with the second single-pole single-throw switch, the other end of the fourth single-pole double-throw switch is connected with the first single-pole single-throw switch, one end of the fifth single-pole double-throw switch is connected with the first fixed attenuator, and one end of the fifth single-pole double-throw switch is connected with the sixth single-pole double-throw switch.
The invention also provides a method for calibrating the radar system of the universal radar system non-delay full-link calibration system, which realizes three calibration modes of transmitting calibration, receiving calibration and reference calibration of the radar system by combining different single-pole single-throw switches and acquires the full-link calibration parameters of the radar system in real time.
Compared with the prior art, the invention has the following beneficial effects:
(1) Compared with the traditional delay calibration method, the invention does not need an extra delay device, has simple system structure, high stability of the transmission characteristic of the scaler and higher internal calibration precision.
(2) The internal calibration module can select the attenuation value in 0.5dB steps within the range of 0-63 dB, and has a larger dynamic range.
(3) According to the invention, the internal calibration module adopts the bidirectional multiplexing numerical control attenuator, so that the consistency of the control of the intensity of calibration signals in different calibration modes is ensured, the complexity of the calibration module is reduced, and the reliability of the module is improved.
(4) According to the invention, leakage signals are reduced through six measures, and high isolation is realized among the transmitting link, the receiving link and the calibration link.
(5) The invention can provide high-precision calibration signals under the condition of environmental temperature change, and provides a solution for accurately acquiring the amplitude and phase parameters of the receiving and transmitting chain under the condition of long-time work of a radar system and severe environmental temperature change.
Drawings
FIG. 1 is a schematic diagram of an internal calibration module according to the present invention;
FIG. 2 is a block diagram of the system components after an upgrade to a typical radar system according to the present invention;
FIG. 3 is a flow chart of transmit calibration after an upgrade to a typical radar system according to the present invention;
FIG. 4 is a flow chart of receive scaling after an upgrade to a typical radar system according to the present invention;
FIG. 5 is a reference calibration flow chart after an upgrade to a typical radar system according to the present invention;
reference numerals: the first coupler 1, the second coupler 2, the first digital controlled attenuator 3, the second digital controlled attenuator 4, the first fixed attenuator 5, the second fixed attenuator 6, the first single pole single throw switch 7, the second single pole single throw switch 8, the third single pole double throw switch 9, the fourth single pole double throw switch 10, the fifth single pole double throw switch 11, the sixth single pole double throw switch 12, the seventh single pole double throw switch 13, the up-conversion channel 14, the first amplifier 15, the filter 16, the first isolator 17, the second amplifier 18, the eighth single pole single throw switch 19, the third amplifier 20, the first circulator 21, the second isolator 22, the ninth single pole single throw switch 23, the tenth single pole double throw switch 24, the low noise amplifier 25, the power amplifier 26, the second circulator 27, the antenna 28, the eleventh single pole single throw switch 29, the twelfth single pole double throw switch 30, the down-conversion channel 31, the AD converter 32, and the DA converter 33.
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.
As shown in fig. 1, the internal calibration module in the present invention includes: the first digital control attenuator 3, the second digital control attenuator 4, the first fixed attenuator 5, the second fixed attenuator 6, the first single-pole single-throw switch 7, the second single-pole single-throw switch 8, the third single-pole double-throw switch 9, the fourth single-pole double-throw switch 10, the fifth single-pole double-throw switch 11, the sixth single-pole double-throw switch 12 and the seventh single-pole double-throw switch 13;
the first interface is a public end of a third single-pole double-throw switch 9, one end of the third single-pole double-throw switch 9 is connected with a second single-pole double-throw switch 8, the second single-pole double-throw switch 8 is connected with a fourth single-pole double-throw switch 10, the other end of the third single-pole double-throw switch 9 is connected with a first fixed attenuator 5, and the first fixed attenuator 5 is connected with a fifth single-pole double-throw switch 11; the second interface is a common end of a seventh single-pole double-throw switch 13, one end of the seventh single-pole double-throw switch 13 is connected with a second fixed attenuator 6, the second fixed attenuator 6 is connected with a sixth single-pole double-throw switch 12, and the other end of the seventh single-pole double-throw switch 13 is connected with the sixth single-pole double-throw switch 12; the third interface is one end of the first single-pole single-throw switch 7, and the other end is connected with the fourth single-pole double-throw switch 10; the public end of the fourth single-pole double-throw switch 10 is connected with the first digital control attenuator 3, the first digital control attenuator 3 is connected with the second digital control attenuator 4, the second digital control attenuator 4 is connected with the public end of the fifth single-pole double-throw switch 11, one end of the fourth single-pole double-throw switch 10 is connected with the second single-pole single-throw switch 8, the other end is connected with the first single-pole single-throw switch 7, one end of the fifth single-pole double-throw switch 11 is connected with the first fixed attenuator 5, and one end is connected with the sixth single-pole double-throw switch 12.
The internal calibration link of the internal calibration system comprises an internal calibration module, a first coupler 1 and a second coupler 2.
The two-way multiplexing first digital control attenuator 3 and the second digital control attenuator 4 can select attenuation values in a 0.5dB step-by-step mode within the range of 0-63 dB, and the scaling signal strength under different scaling modes is controlled to be consistent, so that the complexity of the internal scaling module is reduced, and the reliability of the internal scaling module is improved. The radar system transmitting calibration, receiving calibration and reference calibration are realized by different single-pole single-throw switches and single-pole double-throw switch combination modes, so that the internal calibration parameters of the radar system full link are obtained in real time.
The integrated temperature sensor is designed in the internal calibration module, so that the temperature of the internal calibration module can be monitored on line in real time. And in the debugging process of the internal calibration module, testing link transmission parameters under different temperature conditions and different attenuation setting conditions to generate a temperature-transmission parameter comparison table. In the online real-time calibration process of the radar system, the true value of the transmission parameter is selected from the temperature-transmission parameter comparison table according to the feedback temperature value of the temperature sensor, so that the high-precision calibration within the working temperature range is realized.
As shown in fig. 2, the invention adds an internal calibration module, a calibration signal coupling circuit and a separation circuit on the typical radar system composition to realize the internal calibration function of the radar system. After a typical radar system is modified, the modified radar system comprises an integrated digital unit, an up-conversion module, a receiving channel module, a power amplification module, an antenna and an internal calibration module.
The up-conversion module comprises an up-conversion channel 14, a first amplifier 15, a filter 16, a first coupler 1, a first isolator 17 and a second amplifier 18 which are sequentially connected, wherein the first coupler 1 is simultaneously connected with an eighth single-pole single-throw switch 19, the eighth single-pole single-throw switch 19 is connected with a first interface of the internal scaling module, and the other end of the second amplifier 18 is connected with a third amplifier 20 of the power amplification module.
The power amplification module comprises a third amplifier 20, a first circulator 21, a second isolator 22 and a ninth single-pole single-throw switch 23 which are sequentially connected, the other end of the ninth single-pole single-throw switch 23 is connected with an eleventh single-pole single-throw switch 29 of the receiving channel module, and the first circulator is simultaneously connected with the common end of the tenth single-pole double-throw switch 24.
The integrated digital unit comprises an AD converter 32 and a DA converter 33, the DA converter 33 being connected to the up-conversion channel 14, the AD converter 32 being connected to the down-conversion channel 31 in the receive channel module.
The receiving channel module comprises an eleventh single-pole single-throw switch 29, a twelfth single-pole double-throw switch 30 and a down-conversion channel 31 which are sequentially connected, the inner calibration module is connected with the twelfth single-pole double-throw switch 30, and the down-conversion channel 31 is connected with the AD converter 32.
The embodiment of the invention adopts the following specific optimization measures to reduce leakage signals and improve isolation:
(1) The standing wave of the ports of the first isolator 17, the first circulator 21, the second isolator 22 and the tenth single-pole double-throw switch 24 is better than 1.5 in the working bandwidth, so that the reflection and multiple reflection of signals among devices can be reduced.
(2) The first circulator 21 and the second circulator 27 are high-isolation double-ring circulators, and the first isolator 17 and the second isolator 22 are designed to improve the isolation between ports of the shared device of the transceiver link.
(3) The frequency synthesizer module, the comprehensive digital unit, the up-conversion module, the power amplification module, the receiving channel module and the internal calibration module all adopt independent shielding cavities, and the module radio frequency and low frequency connectors adopt EMC connectors to block or reduce the space coupling of leakage signals.
(4) When the radar system works in the receiving calibration mode and the reference calibration mode, the power supply of active devices such as the first amplifier 15 in the up-conversion module, the third amplifier 20 in the power amplification module, the power amplifier 26 and the like is disconnected, and the radar system is in a silent state, so that the source power of a transmitted signal is reduced.
(5) Additional five single pole single throw switches were designed: the first single-pole single-throw switch 7, the second single-pole single-throw switch 8, the eighth single-pole single-throw switch 19, the ninth single-pole single-throw switch 23 and the eleventh single-pole single-throw switch 29 are controlled to be in an off state when the circuit in which the single-pole single-throw switch is positioned does not participate in calibration work so as to block transmission of leakage signals through the circuit in which the switch is positioned.
(6) According to radar system parameters, the coupling degree index of the first coupler 1 and the second coupler 2 is finely adjusted, so that the calibration signal is at a higher level as much as possible.
In the embodiment, the transmitting calibration, receiving calibration and reference calibration of the radar system are realized by different single-pole single-throw switches and single-pole double-throw switch combination modes, so that the internal calibration parameters of the whole link of the radar system are obtained in real time. I.e. the invention has three scaling modes of transmit scaling, receive scaling, reference scaling.
(1) As shown in fig. 3, when in the transmit calibration mode, the first single pole single throw switch 7 is on, the second single pole single throw switch 8, the eighth single pole single throw switch 19, the ninth single pole single throw switch 23, the eleventh single pole single throw switch 29 are off. The third single-pole double-throw switch 9 is connected with any one end, the fourth single-pole double-throw switch 10 is connected with the first single-pole single-throw switch 7, the fifth single-pole double-throw switch 11 is connected with the sixth single-pole double-throw switch 12, the sixth single-pole double-throw switch 12 is connected with the second fixed attenuator 6, the seventh single-pole double-throw switch 13 is connected with the second fixed attenuator 6, the tenth single-pole double-throw switch 24 is connected with the power amplifier 26, and the twelfth single-pole double-throw switch 30 is connected with the first single-pole single-throw switch 7.
The transmit scaling process includes: the DA port of the integrated digital unit outputs an intermediate frequency signal to the up-conversion module, the up-conversion module outputs a radio frequency emission scaling signal, and the radio frequency emission scaling signal sequentially passes through the power amplification module, the tenth single-pole double-throw switch 24, the power amplifier 26, the second circulator 27, the second coupler 2, the internal scaling module and the receiving channel module, and finally the receiving channel module outputs the intermediate frequency signal to enter the AD port of the integrated digital unit.
In the transmitting calibration process, the intermediate frequency signal sequentially passes through an up-conversion channel 14, a first amplifier 15, a filter 16, a first coupler 1, a first isolator 17 and a second amplifier 18 in the up-conversion module to output a radio frequency transmitting calibration signal.
In the transmit scaling process, the rf transmit scaling signal passes through the third amplifier 20 and the first circulator 21 in sequence in the power amplification module.
In the transmitting calibration process, the radio frequency transmitting calibration signal sequentially passes through a seventh single-pole double-throw switch 13, a second fixed attenuator 6, a sixth single-pole double-throw switch 12, a fifth single-pole double-throw switch 11, a second numerical control attenuator 4, a first numerical control attenuator 3, a fourth single-pole double-throw switch 10 and a first single-pole single-throw switch 7 in an inner calibration module.
In the transmitting calibration process, the radio frequency transmitting calibration signal sequentially passes through a twelfth single-pole double-throw switch 30 and a down-conversion channel 31 in the receiving channel module to output an intermediate frequency signal.
(2) As shown in fig. 4, when in the receive calibration mode, the first single-pole single-throw switch 7 is off, the second single-pole single-throw switch 8, the eighth single-pole single-throw switch 19, the ninth single-pole single-throw switch 23, and the eleventh single-pole single-throw switch 29 are on. The third single-pole double-throw switch 9 is connected with the second single-pole single-throw switch 8, the fourth single-pole double-throw switch 10 is connected with the second single-pole single-throw switch 8, the fifth single-pole double-throw switch 11 is connected with the sixth single-pole double-throw switch 12, the sixth single-pole double-throw switch 12 is connected with the seventh single-pole double-throw switch 13, the seventh single-pole double-throw switch 13 is connected with the sixth single-pole double-throw switch 12, the tenth single-pole double-throw switch 24 is connected with the low noise amplifier 25, and the twelfth single-pole double-throw switch 30 is connected with the eleventh single-pole single-throw switch 29.
The process of receive scaling includes: the DA port of the integrated digital unit outputs an intermediate frequency signal to the up-conversion module, the up-conversion module outputs a radio frequency receiving calibration signal, the radio frequency receiving calibration signal sequentially passes through the internal calibration module, the second coupler 2, the second circulator 27, the low noise amplifier 25, the tenth single-pole double-throw switch 24, the power amplification module and the receiving channel module, and finally the receiving channel module outputs the intermediate frequency signal to enter the AD port of the integrated digital unit.
In the receiving calibration process, the intermediate frequency signal sequentially passes through an up-conversion channel 14, a first amplifier 15, a filter 16, a first coupler 1 and an eighth single-pole single-throw switch 19 in an up-conversion module to output a radio frequency receiving calibration signal.
In the receiving calibration process, the radio frequency receiving calibration signal sequentially passes through a third single-pole double-throw switch 9, a second single-pole single-throw switch 8, a fourth single-pole double-throw switch 10, a first numerical control attenuator 3, a second numerical control attenuator 4, a fifth single-pole double-throw switch 11, a sixth single-pole double-throw switch 12 and a seventh single-pole double-throw switch 13 in an inner calibration module.
In the receiving calibration process, the radio frequency receiving calibration signal sequentially passes through the first circulator 21, the second isolator 22 and the ninth single-pole single-throw switch 23 in the power amplification module.
In the receiving calibration process, the radio frequency receiving calibration signal sequentially passes through an eleventh single-pole single-throw switch 29, a twelfth single-pole double-throw switch 30 and a down-conversion channel 31 in the receiving channel module to output an intermediate frequency signal.
(3) As shown in fig. 5, when in the reference calibration mode, the first single-pole single-throw switch 7, the eighth single-pole single-throw switch 19 is on, and the second single-pole single-throw switch 8, the ninth single-pole single-throw switch 23, the eleventh single-pole single-throw switch 29 is off. The third single-pole double-throw switch 9 is connected with the first fixed attenuator 5, the fourth single-pole double-throw switch 10 is connected with the first single-pole single-throw switch 7, the fifth single-pole double-throw switch 11 is connected with the first fixed attenuator 5, the sixth single-pole double-throw switch 12 is connected with any one end, the seventh single-pole double-throw switch 13 is connected with any one end, the tenth single-pole double-throw switch 24 is connected with any one end, and the twelfth single-pole double-throw switch 30 is connected with the first single-pole single-throw switch 7.
The reference scaling process includes: the DA port of the integrated digital unit outputs an intermediate frequency signal to the up-conversion module, the up-conversion module outputs a radio frequency reference signal, and the radio frequency reference signal sequentially passes through the internal calibration module, the receiving channel module and finally enters the AD port of the integrated digital unit.
In the reference scaling process, the intermediate frequency input signal sequentially passes through the up-conversion channel 14, the first amplifier 15, the filter 16, the first coupler 1 and the eighth single-pole single-throw switch 19 in the up-conversion module to output a radio frequency reference scaling signal.
In the reference calibration process, the radio frequency reference calibration signal sequentially passes through a third single-pole double-throw switch 9, a first fixed attenuator 5, a fifth single-pole double-throw switch 11, a second numerical control attenuator 4, a first numerical control attenuator 3, a fourth single-pole double-throw switch 10 and a first single-pole single-throw switch 7 in an inner calibration module.
In the reference calibration process, the radio frequency reference calibration signal sequentially passes through a twelfth single-pole double-throw switch 30 and a down-conversion channel 31 in the receiving channel module to output an intermediate frequency signal.
Claims (10)
1. A generalized radar system non-delayed full link internal calibration system, comprising: the device comprises an internal calibration module, a first coupler and a second coupler; the internal calibration module comprises a first numerical control attenuator and a second numerical control attenuator which are multiplexed in two directions, a first fixed attenuator, a second fixed attenuator, a first single-pole single-throw switch, a second single-pole single-throw switch, a third single-pole double-throw switch, a fourth single-pole double-throw switch, a fifth single-pole double-throw switch, a sixth single-pole double-throw switch and a seventh single-pole double-throw switch; the internal calibration module is internally provided with a first interface, a second interface and a third interface; the first interface is a common end of a third single-pole double-throw switch, one end of the third single-pole double-throw switch is connected with one end of a second single-pole double-throw switch, the other end of the second single-pole double-throw switch is connected with one end of a fourth single-pole double-throw switch, the other end of the third single-pole double-throw switch is connected with one end of a first fixed attenuator, and the other end of the first fixed attenuator is connected with one end of a fifth single-pole double-throw switch; the second interface is a public end of a seventh single-pole double-throw switch, one end of the seventh single-pole double-throw switch is connected with one end of a second fixed attenuator, the other end of the second fixed attenuator is connected with one end of a sixth single-pole double-throw switch, and the other end of the seventh single-pole double-throw switch is connected with the other end of the sixth single-pole double-throw switch; the third interface is one end of a first single-pole single-throw switch, and the other end of the first single-pole single-throw switch is connected with the other end of a fourth single-pole double-throw switch; the public end of the fourth single-pole double-throw switch is connected with one end of the first numerical control attenuator, the other end of the first numerical control attenuator is connected with one end of the second numerical control attenuator, the other end of the second numerical control attenuator is connected with the public end of the fifth single-pole double-throw switch, one end of the fourth single-pole double-throw switch is connected with the other end of the second single-pole single-throw switch, the other end of the fourth single-pole double-throw switch is connected with the other end of the first single-pole single-throw switch, one end of the fifth single-pole double-throw switch is connected with the other end of the first fixed attenuator, and the other end of the fifth single-pole double-throw switch is connected with the public end of the sixth single-pole double-throw switch;
the device also comprises an eighth single-pole single-throw switch, a ninth single-pole single-throw switch, a tenth single-pole double-throw switch, an eleventh single-pole single-throw switch, a twelfth single-pole double-throw switch, a first isolator, a second isolator, a first circulator and a second circulator; one end of the eighth single-pole single-throw switch is connected with the first coupler, and the other end of the eighth single-pole single-throw switch is connected with the first interface of the internal calibration module; one end of the ninth single-pole single-throw switch is connected with one end of the second isolator, the other end of the ninth single-pole single-throw switch is connected with one end of the eleventh single-pole single-throw switch, the other end of the second isolator is connected with the 3 rd end of the first circulator, the 1 st end of the first circulator is connected with the third amplifier, and the 2 nd end of the first circulator is connected with the common end of the tenth single-pole double-throw switch; the other two ends of the tenth single-pole double-throw switch are respectively connected with one end of the low-noise amplifier and one end of the power amplifier, the other end of the power amplifier is connected with the 1 st end of the second circulator, the 3 rd end of the second circulator is connected with the other end of the low-noise amplifier, the 2 nd end of the second circulator is connected with one end of the second coupler, the other end of the second coupler is connected with the second interface of the internal calibration module, and the third end of the second coupler is connected with the antenna; the other end of the eleventh single-pole single-throw switch is connected with one end of the twelfth single-pole double-throw switch, the other end of the twelfth single-pole double-throw switch is connected with the third interface of the internal calibration module, and the public end of the twelfth single-pole double-throw switch is connected with the down-conversion channel; the first isolator is arranged between the first coupler and the second amplifier; the second isolator is arranged between the first circulator and the ninth single-pole single-throw switch;
the system also comprises an integrated digital unit, an up-conversion module, a power amplification module, a low noise amplifier, a power amplifier and a receiving channel module; the integrated digital unit comprises an AD converter and a DA converter, the DA converter is connected with the up-conversion channel, and the AD converter is connected with the down-conversion channel in the receiving channel module; the up-conversion module comprises an up-conversion channel, a first amplifier, a filter, a first coupler, a first isolator and a second amplifier which are sequentially connected, wherein the first coupler is simultaneously connected with one end of an eighth single-pole single-throw switch, the other end of the eighth single-pole single-throw switch is connected with a first interface of the internal calibration module, and the output end of the second amplifier is connected with a third amplifier of the power amplification module;
the power amplification module comprises a third amplifier, a first circulator, a second isolator and a ninth single-pole single-throw switch which are sequentially connected, the other end of the ninth single-pole single-throw switch is connected with an eleventh single-pole single-throw switch of the receiving channel module, and the first circulator is simultaneously connected with a common end of the tenth single-pole double-throw switch;
the receiving channel module comprises an eleventh single-pole single-throw switch, a twelfth single-pole double-throw switch and a down-conversion channel which are sequentially connected, the inner calibration module is connected with the twelfth single-pole double-throw switch, and the down-conversion channel is connected with the AD converter.
2. The non-delay full-link internal calibration system of a generalized radar system according to claim 1, wherein the bi-directionally multiplexed first and second digitally controlled attenuators select attenuation values in 0.5dB steps in the range of 0-63 dB.
3. The universal radar system non-delay full-link internal calibration system as recited in claim 1, wherein the internal integrated temperature sensor of the internal calibration module is configured to monitor the temperature of the internal calibration module on line in real time.
4. The universal radar system non-delay full-link internal calibration system according to claim 1, wherein the standing port wave of the first isolator, the first circulator, the second isolator, the tenth single pole double throw switch is better than 1.5 in the operating bandwidth.
5. The non-delay full-link internal calibration system of a generalized radar system according to claim 1, wherein the first circulator and the second circulator are high-isolation double-ring circulators, and are provided with a first isolator and a second isolator to improve the isolation between ports of a shared device of a transceiver link.
6. The non-delay full-link internal calibration system of a generalized radar system according to any one of claims 1-5, wherein the system is further comprised of a frequency synthesizer module, an integrated digital unit, an up-conversion module, a power amplification module, and a reception channel module, wherein the frequency synthesizer module, the integrated digital unit, the up-conversion module, the power amplification module, the reception channel module, and the internal calibration module each employ an independently shielded cavity, and wherein the module rf and low frequency connectors employ EMC connectors to block or reduce spatial coupling of leakage signals.
7. The method for the internal calibration of the universal radar system non-delay full-link internal calibration system based on the claim 6 is characterized in that three calibration modes of transmitting calibration, receiving calibration and reference calibration of the radar system are realized through different single-pole single-throw switches and single-pole double-throw switch combination modes, and the internal calibration parameters of the radar system full-link are obtained in real time.
8. The internal calibration method of claim 7, wherein when in the transmit calibration mode, the first single pole single throw switch is on, the second single pole single throw switch, the eighth single pole single throw switch, the ninth single pole single throw switch, the eleventh single pole single throw switch is off; the third single-pole double-throw switch is connected with any one end, the fourth single-pole double-throw switch is connected with the first single-pole single-throw switch, the fifth single-pole double-throw switch is connected with the sixth single-pole double-throw switch, the sixth single-pole double-throw switch is connected with the second fixed attenuator, the seventh single-pole double-throw switch is connected with the second fixed attenuator, the tenth single-pole double-throw switch is connected with the power amplifier, and the twelfth single-pole double-throw switch is connected with the first single-pole single-throw switch;
the DA port of the integrated digital unit outputs an intermediate frequency signal to the up-conversion module, the up-conversion module outputs a radio frequency emission calibration signal, and the radio frequency emission calibration signal sequentially passes through the power amplification module, the tenth single-pole double-throw switch, the power amplifier, the second circulator, the second coupler, the internal calibration module and the receiving channel module, and finally the receiving channel module outputs the intermediate frequency signal to enter the AD port of the integrated digital unit;
the intermediate frequency signal sequentially passes through an up-conversion channel, a first amplifier, a filter, a first coupler, a first isolator and a second amplifier in an up-conversion module to output a radio frequency emission scaling signal;
the radio frequency emission calibration signal sequentially passes through a third amplifier and a first circulator in a power amplification module;
the radio frequency emission calibration signal sequentially passes through a seventh single-pole double-throw switch, a second fixed attenuator, a sixth single-pole double-throw switch, a fifth single-pole double-throw switch, a second numerical control attenuator, a first numerical control attenuator, a fourth single-pole double-throw switch and a first single-pole single-throw switch in an inner calibration module;
the radio frequency emission calibration signal sequentially passes through a twelfth single-pole double-throw switch and a down-conversion channel in the receiving channel module to output an intermediate frequency signal.
9. The internal calibration method of claim 7, wherein when in the receive calibration mode, the first single pole single throw switch is off, the second single pole single throw switch, the eighth single pole single throw switch, the ninth single pole single throw switch, the eleventh single pole single throw switch is on; the third single-pole double-throw switch is connected with the second single-pole single-throw switch, the fourth single-pole double-throw switch is connected with the second single-pole single-throw switch, the fifth single-pole double-throw switch is connected with the sixth single-pole double-throw switch, the sixth single-pole double-throw switch is connected with the seventh single-pole double-throw switch, the seventh single-pole double-throw switch is connected with the sixth single-pole double-throw switch, the tenth single-pole double-throw switch is connected with the low noise amplifier, and the twelfth single-pole double-throw switch is connected with the eleventh single-pole single-throw switch;
the process of receive scaling includes: the DA port of the integrated digital unit outputs an intermediate frequency signal to the up-conversion module, the up-conversion module outputs a radio frequency receiving calibration signal, the radio frequency receiving calibration signal sequentially passes through the internal calibration module, the second coupler, the second circulator, the low noise amplifier, the tenth single-pole double-throw switch, the power amplification module and the receiving channel module, and finally the receiving channel module outputs the intermediate frequency signal to enter the AD port of the integrated digital unit;
the intermediate frequency signal sequentially passes through an up-conversion channel, a first amplifier, a filter, a first coupler and an eighth single-pole single-throw switch in an up-conversion module, and outputs a radio frequency receiving scaling signal;
the radio frequency receiving calibration signal sequentially passes through a third single-pole double-throw switch, a second single-pole double-throw switch, a fourth single-pole double-throw switch, a first numerical control attenuator, a second numerical control attenuator, a fifth single-pole double-throw switch, a sixth single-pole double-throw switch and a seventh single-pole double-throw switch in an inner calibration module;
the radio frequency receiving calibration signal sequentially passes through a first circulator, a second isolator and a ninth single-pole single-throw switch in a power amplification module;
the radio frequency receiving calibration signal sequentially passes through an eleventh single-pole single-throw switch, a twelfth single-pole double-throw switch and a down-conversion channel in the receiving channel module to output an intermediate frequency signal.
10. The internal calibration method of claim 7, wherein when in the reference calibration mode, the first single-pole single-throw switch, the eighth single-pole single-throw switch are on, the second single-pole single-throw switch, the ninth single-pole single-throw switch, the eleventh single-pole single-throw switch are off, the third single-pole double-throw switch is connected to the first fixed attenuator, the fourth single-pole double-throw switch is connected to the first single-pole single-throw switch, the fifth single-pole double-throw switch is connected to the first fixed attenuator, the sixth single-pole double-throw switch is connected to either end, the seventh single-pole double-throw switch is connected to either end, the tenth single-pole double-throw switch is connected to either end, and the twelfth single-pole double-throw switch is connected to the first single-pole single-throw switch;
the DA port of the integrated digital unit outputs an intermediate frequency signal to the up-conversion module, the up-conversion module outputs a radio frequency reference signal, and the radio frequency reference signal sequentially passes through the internal calibration module, the receiving channel module and finally enters the AD port of the integrated digital unit;
the intermediate frequency input signal sequentially passes through an up-conversion channel, a first amplifier, a filter, a first coupler and an eighth single-pole single-throw switch in an up-conversion module to output a radio frequency reference calibration signal;
the radio frequency reference calibration signal sequentially passes through a third single-pole double-throw switch, a first fixed attenuator, a fifth single-pole double-throw switch, a second numerical control attenuator, a first numerical control attenuator, a fourth single-pole double-throw switch and a first single-pole single-throw switch in an inner calibration module;
in the reference calibration process, the radio frequency reference calibration signal sequentially passes through a twelfth single-pole double-throw switch and a down-conversion channel in a receiving channel module to output an intermediate frequency signal.
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| CN111082831A (en) * | 2019-12-30 | 2020-04-28 | 中国科学院电子学研究所 | Satellite-borne synchronous transmitting and receiving device and signal processing method |
| CN113820670A (en) * | 2021-08-23 | 2021-12-21 | 北京遥测技术研究所 | On-orbit internal calibration method for satellite-borne phased array meteorological radar |
| CN114675245A (en) * | 2022-04-21 | 2022-06-28 | 中国科学院空天信息创新研究院 | Design device and method of transceiving calibration component |
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| CN113820670A (en) * | 2021-08-23 | 2021-12-21 | 北京遥测技术研究所 | On-orbit internal calibration method for satellite-borne phased array meteorological radar |
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