A method for determining the calibration network in a multi-channel SAR without delay

Abstract

The present application provides a method for determining a calibration network in a multi-channel SAR without delay. Calibration is performed through a calibration network in a multi-channel SAR without delay. The transmitting branch is connected to the power amplifiers of multiple driver amplifiers, and the limiter of a driver amplifier is connected to one end of a single-pole double-throw switch of a receiving branch. The circulator of each driver amplifier is connected to the first feeding network through a transceiver channel. The coupler of the transmitting branch is connected to the third single-pole double-throw switch of the calibration module. The phased array antenna module is connected to the first single-pole double-throw switch of the calibration module through a combiner. The calibration module is connected to the power divider through a single-pole single-throw switch. The power divider is connected to the other end of the single-pole double-throw switch in each receiving branch. The receiving branch is connected to the integrated digital unit. The integrated digital unit is connected to the transmitting branch. The calibration network and method provided in the present application can improve the gain stability when performing non-delay calibration.

Description

Technical Field

[0001] The present application relates to the field of aerospace technology, and in particular to a method for determining a calibration network in a multi-channel SAR without delay. Background Art

[0002] With the continuous development of science and technology, people pay more and more attention to the exploration of space. Synthetic Aperture Radar (SAR) is a radar that can provide high-resolution, wide-band remote sensing images containing more product information. In order to adapt to conditions such as high resolution and wide-band, higher requirements are placed on the SAR system. The traditional single-channel spaceborne SAR system is constrained by the minimum antenna area, and the azimuth resolution and range imaging band width cannot be improved at the same time. In order to cope with this problem, the multi-channel SAR system came into being.

[0003] The multi-channel SAR system is usually considered to be a linear system with distortion-free matched filtering. However, in reality, various distortions will be generated due to errors in filters, amplifiers, mixers and other equipment in the radar transmitting and receiving branches, resulting in channel inconsistency errors. In order to achieve high-resolution imaging quality of the multi-channel SAR system, it is necessary to accurately calibrate the actual on-orbit characteristics of the system's transceiver channels.

[0004] There are two methods for calibrating a multi-channel SAR system in the prior art, namely, non-delay calibration and delayed calibration. However, the calibration network and calibration method of the multi-channel SAR system provided by the prior art have poor gain stability.

[0005] Therefore, how to improve the gain stability when performing non-delay calibration has become a technical problem that technical personnel in this field need to solve urgently. Summary of the invention

[0006] Based on the above problems, the present application provides a method for determining a calibration network in a multi-channel SAR without delay, which can improve the gain stability when performing non-delay calibration.

[0007] The present application provides a multi-channel SAR non-delay calibration network, the calibration network comprising:

[0008] Transmitting branch, receiving branch, multiple driver amplifiers, phased array antenna module, calibration module, power divider and integrated digital unit;

[0009] The transmitting branch includes an up-converter and a coupler, and the up-converter is connected to the coupler;

[0010] One of the receiving branches includes a down converter and a single-pole double-throw switch, and the single-pole double-throw switch is connected to the down converter;

[0011] A driving amplifier includes a power amplifier, a circulator and a limiter, wherein the power amplifier is connected to the circulator, and the circulator is connected to the limiter;

[0012] The phased array antenna module includes a first feed network, a second feed network, a plurality of T / R components, an antenna unit and a combiner, wherein the first feed network is connected to the T / R component, the T / R component is connected to the second feed network, the second feed network is connected to the combiner, and one of the T / R components includes a V transmitting branch and a V receiving branch;

[0013] The calibration module includes six single-pole double-throw switches, one single-pole single-throw switch, two fixed attenuators and two digitally controlled attenuators, the first single-pole double-throw switch is connected to the second fixed attenuator and the second single-pole double-throw switch, the second single-pole double-throw switch is connected to the fourth single-pole double-throw switch, the fourth single-pole double-throw switch is connected to the first fixed attenuator and the second digitally controlled attenuator, the first fixed attenuator is connected to the third single-pole double-throw switch, the third single-pole double-throw switch is connected to the fifth single-pole double-throw switch, the fifth single-pole double-throw switch is connected to the sixth single-pole double-throw switch, the sixth single-pole double-throw switch is connected to the single-pole single-throw switch and the first digitally controlled attenuator, and the first digitally controlled attenuator is connected to the second digitally controlled attenuator;

[0014] The transmitting branch is connected to the power amplifiers of the plurality of driving amplifiers, and the limiter of one driving amplifier is connected to one end of the single-pole double-throw switch of one receiving branch;

[0015] The circulator of each of the driving amplifiers is connected to the first feeding network via a transceiver channel;

[0016] The coupler of the sending branch is connected to the third single-pole double-throw switch of the calibration module;

[0017] The phased array antenna module is connected to the first single-pole double-throw switch of the calibration module through the combiner;

[0018] The calibration module is connected to the power divider via a single-pole single-throw switch;

[0019] The power divider is connected to the other end of the single-pole double-throw switch in each receiving branch;

[0020] The receiving branch is connected to the integrated digital unit;

[0021] The integrated digital unit is connected to the transmitting branch.

[0022] The present application also provides a method for determining a calibration network in a multi-channel SAR without delay, the method comprising:

[0023] If the calibration network calibrates the noise signal, the noise signal is calibrated according to the noise signal flow direction corresponding to the noise signal;

[0024] If the calibration network calibrates the reference signal, calibrating the reference signal according to the reference signal flow direction corresponding to the reference signal;

[0025] If the calibration network calibrates the full array transmit signal, the full array transmit signal is calibrated according to the full array transmit signal flow direction corresponding to the full array transmit signal;

[0026] If the calibration network calibrates the full array reception signal, the full array reception signal is calibrated according to the full array reception signal flow direction corresponding to the full array reception signal;

[0027] If the calibration network calibrates a single T / R transmission signal, calibrating the single T / R transmission signal according to a single T / R transmission signal flow direction corresponding to the single T / R transmission signal;

[0028] If the calibration network calibrates a single T / R received signal, the single T / R received signal is calibrated according to the flow direction of the noise signal corresponding to the single T / R received signal.

[0029] In a possible implementation manner, if the calibration network calibrates the noise signal, calibrating the noise signal according to the noise signal flow direction corresponding to the noise signal includes:

[0030] If the phased array antenna module in the calibration network receives an external noise signal, the noise signal enters the V receiving branch of the T / R component through the antenna unit of the phased array antenna module;

[0031] The V receiving branch sends the noise signal to the first feeding network, and the first feeding network combines the noise signal to obtain a combined noise signal;

[0032] The combined noise signal is sent to multiple drive amplifiers through multiple transceiver channels;

[0033] Each of the driving amplifiers passes the combined noise signal through a circulator and a limiter, and then sends the combined noise signal to a corresponding number of single-pole double-throw switches of receiving branches through the limiter;

[0034] The combined noise signal received by each receiving branch is processed by a down-converter, and then the integrated digital unit collects each combined noise signal processed by the down-converter to obtain a calibrated noise signal.

[0035] In a possible implementation manner, if the calibration network calibrates the reference signal, calibrating the reference signal according to a reference signal flow direction corresponding to the reference signal includes:

[0036] If the transmitting branch outputs a reference signal, the reference signal couples a portion of energy through the coupler as a coupled signal, and the transmitting branch transmits the coupled signal to a third single-pole double-throw switch of the calibration module;

[0037] The coupling signal flows successively through the third single-pole double-throw switch, the first fixed attenuator, the fourth single-pole double-throw switch, the second digitally controlled attenuator, the first digitally controlled attenuator, the sixth single-pole double-throw switch, and the single-pole single-throw switch;

[0038] The coupling signal flows through the power divider via a single-pole single-throw switch, the coupling signal is divided into multiple intermediate coupling signals by the power divider, and the power divider sends each intermediate coupling signal to the single-pole double-throw switch of the corresponding receiving branch;

[0039] The intermediate coupling signal is collected by the integrated digital unit after passing through the down-converter to obtain the calibration reference signal.

[0040] In a possible implementation, if the calibration network calibrates the full array transmit signal, the full array transmit signal is calibrated according to the full array transmit signal flow direction corresponding to the full array transmit signal;

[0041] If the transmitting branch outputs a linear frequency modulation signal, the linear frequency modulation signal is transmitted to a multi-channel driving amplifier, the linear frequency modulation signal is processed by the multi-channel driving amplifier, and then the circulator outputs a multi-channel full-array transmitting sub-signal;

[0042] The first feeding network receives multiple full-array transmission sub-signals to form a full-array transmission signal;

[0043] The full array transmission signal is output by the first feeding network to the T / R component, and the V transmission branch of the T / R component works;

[0044] The full array transmission signal is transmitted to the second feeding network via the coupler of the T / R component;

[0045] The second feeding network transmits the full array transmission signal to the first single-pole double-throw switch of the calibration module through the combiner;

[0046] The full array transmission signal passes through the first single-pole double-throw switch, the second fixed attenuator, the second single-pole double-throw switch, the fourth single-pole double-throw switch, the second digitally controlled attenuator, the first digitally controlled attenuator, the sixth single-pole double-throw switch and the single-pole single-throw switch in sequence;

[0047] The full array transmission signal is transmitted to the power divider through a single-pole single-throw switch;

[0048] The power divider divides the signals into multiple calibrated full array transmission sub-signals, and transmits the multiple calibrated full array transmission sub-signals to the corresponding single-pole double-throw switches of the receiving branches;

[0049] The calibrated full-array transmission sub-signals in the plurality of receiving branches are processed by the down-converter and collected by the integrated digital unit to obtain the calibrated full-array transmission signal.

[0050] In a possible implementation, if the calibration network calibrates the full array received signal, calibrating the full array received signal according to the full array received signal flow direction corresponding to the full array received signal includes:

[0051] The transmitting branch outputs a linear frequency modulation signal and couples a part of the energy through a coupler as a full array receiving signal, and the transmitting branch transmits the full array receiving signal to a third single-pole double-throw switch of the calibration module;

[0052] The full array receiving signal flows successively through the third single-pole double-throw switch, the fifth single-pole double-throw switch, the sixth single-pole double-throw switch, the first digitally controlled attenuator, the second digitally controlled attenuator, the fourth single-pole double-throw switch, the second single-pole double-throw switch, and the first single-pole double-throw switch;

[0053] The full array receiving signal is transmitted to the combiner of the phased array antenna module through a first single-pole double-throw switch;

[0054] The full array receiving signal is transmitted to the second feeding network through the combiner, and the second feeding network distributes the full array receiving signal to multiple T / R components, and the V receiving branch of each T / R component is in working state;

[0055] Each of the T / R components processes the full array reception signal and transmits it to the first feeding network;

[0056] The first feed network sends the full array reception signals processed by the multiple T / R components to the circulators of the multiple driver amplifiers through the transceiver channel;

[0057] The full array receiving signal flows through the circulator, the limiter and the corresponding single-pole double-throw switch in sequence and is then transmitted to the single-pole double-throw switches of multiple receiving branches;

[0058] The calibrated full-array received signals in the plurality of receiving branches are processed by the down-converter and then collected by the integrated digital unit to obtain the calibrated full-array received signals.

[0059] In a possible implementation manner, if the calibration network calibrates the single T / R transmit signal, calibrating the single T / R transmit signal according to the single T / R transmit signal flow direction corresponding to the single T / R transmit signal includes:

[0060] If the linear frequency modulation signal output by the transmitting branch is processed by the circulator of the driving amplifier and then enters the first feeding network to obtain a single T / R transmitting signal;

[0061] The single T / R transmit signal enters a T / R component through a first feed network;

[0062] The single T / R transmission signal enters the second feeding network through the coupler of the T / R component;

[0063] The single T / R transmission signal is processed by the second feed network and then enters the first single-pole double-throw switch of the calibration module through the combiner;

[0064] The single T / R transmission signal flows successively through the first single-pole double-throw switch, the second single-pole double-throw switch, the fourth single-pole double-throw switch, the second digitally controlled attenuator, the first digitally controlled attenuator, the sixth single-pole double-throw switch, and the single-pole single-throw switch;

[0065] The single T / R transmission signal enters the power divider through a single-pole single-throw switch;

[0066] The single T / R transmission signal enters the single-pole double-throw switch of multiple receiving branches through the power divider;

[0067] The single T / R transmission signal enters the down-converter through the single-pole double-throw switches of multiple receiving branches, and is collected by the integrated digital unit after being processed by the down-converter to obtain a calibrated single T / R transmission signal.

[0068] In a possible implementation manner, if the calibration network calibrates a single T / R received signal, calibrating the single T / R received signal according to a signal flow direction corresponding to the single T / R received signal includes:

[0069] If the linear frequency modulation signal output by the transmitting branch is coupled out a part of the energy through the coupler of the transmitting branch as a single T / R receiving signal;

[0070] The single T / R receiving signal enters the third single-pole double-throw switch of the calibration module through the coupler;

[0071] The single T / R receiving signal flows successively through the third single-pole double-throw switch, the fifth single-pole double-throw switch, the sixth single-pole double-throw switch, the first digitally controlled attenuator, the second digitally controlled attenuator, the fourth single-pole double-throw switch, the second single-pole double-throw switch and the first single-pole double-throw switch;

[0072] The single T / R receiving signal enters the combiner of the phased array antenna module through the first single-pole double-throw switch;

[0073] The single T / R receiving signal enters the second feeding network through the combiner and is distributed by the second feeding network to the coupler of a T / R component, and the V receiving channel of the T / R component works;

[0074] The single T / R receiving signal flows through the first feeding network, and after being processed by the first feeding network, enters a circulator of a driving amplifier through a transceiver channel;

[0075] After the single T / R receiving signal flows through the circulator and limiter of the driving amplifier, the limiter outputs the signal to the single-pole double-throw switch of the corresponding receiving branch;

[0076] The single T / R receiving signal enters the down-converter through the single-pole double-throw switch of the receiving branch, and is collected by the integrated digital unit after being processed by the down-converter to obtain a calibrated single T / R receiving signal.

[0077] The present application also provides an electronic device, the electronic device comprising a processor and a memory:

[0078] The memory is used to store a computer program and transmit the computer program to the processor;

[0079] The processor is used to execute the steps of the above-mentioned multi-channel SAR non-delay calibration network determination method according to the instructions in the computer program.

[0080] The present application also provides a computer-readable storage medium, which is used to store a computer program. When the computer program is executed by an electronic device, the steps of the above-mentioned multi-channel SAR non-delay calibration network determination method are implemented.

[0081] Compared with the prior art, this application has the following beneficial effects:

[0082] The calibration network provided in this application significantly improves the gain stability and imaging quality of the system by optimizing the connection and working principle between the transmitting branch, the receiving branch, the driving amplifier, the phased array antenna module and the calibration module. The calibration module design in this application pays special attention to the stability of the gain, and a flexible and accurate gain control network is formed by introducing multiple single-pole double-throw switches, fixed attenuators and digitally controlled attenuators. Compared with the problem that components such as optical delay devices are greatly affected by temperature in the prior art, this application ensures the stability of the on-orbit gain through fine circuit design and component selection, reduces the gain fluctuation of the system under different working environments, and thus improves the imaging quality of the SAR system. In the prior art, active devices such as optical delay devices are expensive, which increases the development cost of the system. This application optimizes the circuit design and uses lower-cost single-pole double-throw switches and digitally controlled attenuators to achieve the same function, reducing the manufacturing and maintenance costs of the overall system, making the multi-channel SAR system more economical. In the system design of this application, the multipath effect and electromagnetic leakage problems are minimized by reasonably arranging the connection between the transmitting branch and the receiving branch. By optimizing the connection mode of the calibration module, the risk of intra-pulse signal interference is reduced and the anti-interference ability of the entire system is improved. The calibration network provided in this application significantly improves the gain stability and imaging quality of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0084] Figure 1 A schematic diagram of the structure of a multi-channel SAR non-delay calibration network provided in an embodiment of the present application;

[0085] Figure 2 A flow chart of a method for determining a calibration network in a multi-channel SAR without delay provided in an embodiment of the present application;

[0086] Figure 3 A noise calibration schematic diagram provided in an embodiment of the present application;

[0087] Figure 4 A reference calibration schematic diagram provided for an embodiment of the present application;

[0088] Figure 5 A schematic diagram of full array emission calibration provided in an embodiment of the present application;

[0089] Figure 6A schematic diagram of full array receiving calibration provided in an embodiment of the present application;

[0090] Figure 7 A schematic diagram of a single T / R transmission calibration provided in an embodiment of the present application;

[0091] Figure 8 A schematic diagram of single T / R receiving calibration provided in an embodiment of the present application. DETAILED DESCRIPTION

[0092] As described above, there are two methods for calibrating a multi-channel SAR system in the prior art, namely, non-delay calibration and delayed calibration. However, the calibration network and calibration method of the multi-channel SAR system provided by the prior art have poor gain stability.

[0093] After research, it was found that multipath effect is easily formed between the transmitting branch and the receiving branch of the calibration network, and there is an electromagnetic leakage interference problem; the advantage of delay calibration is that it avoids the problem of intra-pulse signal interference, but due to the use of active devices such as optical delay devices, it is affected by factors such as temperature on orbit, and the gain stability of the calibration network itself is difficult to guarantee. At the same time, components such as optical delay devices are expensive, which increases the system development cost.

[0094] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0095] Figure 1 A schematic diagram of a multi-channel SAR non-delay calibration network provided in an embodiment of the present application, wherein the calibration network comprises:

[0096] A transmitting branch 100, multiple receiving branches (receiving branch 1, receiving branch 2 and receiving branch 3), multiple driving amplifiers (driving amplifier 1, driving amplifier 2 and driving amplifier 3), a phased array antenna module 200, a calibration module 300, a power divider 400 and an integrated digital unit 500.

[0097] The transmitting branch 100 includes an up-converter and a coupler, and the up-converter is connected to the coupler.

[0098] A receiving branch includes a downconverter ( Figure 1 The down converter in the receiving branch is connected to the receiving branch 1 by S11, the receiving branch 2 by S12, and the receiving branch 3 by S13.

[0099] A driver amplifier consists of a power amplifier ( Figure 1 Amplifier in the Figure 1 The power amplifier is connected to the circulator, and the circulator is connected to the limiter.

[0100] The phased array antenna module includes a first feed network, a second feed network, a plurality of T / R components (T / R component S1 and T / R component S2), an antenna unit and a combiner, wherein the first feed network is connected to the T / R component, the T / R component is connected to the second feed network, the second feed network is connected to the combiner, and a T / R component includes a V transmitting branch and a V receiving branch. A T / R component also includes a coupler.

[0101] The calibration module includes six single-pole double-throw switches ( Figure 1 The first single-pole double-throw switch S4 is connected to the second fixed attenuator (digitally controlled attenuator 2) and the second single-pole double-throw switch S5, the second single-pole double-throw switch S5 is connected to the fourth single-pole double-throw switch S7, and the fourth single-pole double-throw switch S7 is connected to the first fixed attenuator (fixed attenuator 1) and the second fixed attenuator (digitally controlled attenuator 2). ) is connected to the second digitally controlled attenuator (digitally controlled attenuator 2), the first fixed attenuator (fixed attenuator 1) is connected to the third single-pole double-throw switch S6, the third single-pole double-throw switch S6 is connected to the fifth single-pole double-throw switch S8, the fifth single-pole double-throw switch S8 is connected to the sixth single-pole double-throw switch S9, the sixth single-pole double-throw switch S9 is connected to the single-pole single-throw switch S10 and the first digitally controlled attenuator (digitally controlled attenuator 1), and the first digitally controlled attenuator (digitally controlled attenuator 1) is connected to the second digitally controlled attenuator (digitally controlled attenuator 2).

[0102] The transmitting branch is connected to the power amplifiers of the plurality of driving amplifiers, and the limiter of a driving amplifier is connected to one end of a single-pole double-throw switch of a receiving branch.

[0103] The circulator of each driver amplifier is connected to the first feeding network via a transceiver channel.

[0104] The coupler of the transmitting branch is connected to the third single-pole double-throw switch of the calibration module.

[0105] The phased array antenna module is connected to the first single-pole double-throw switch of the calibration module through a combiner.

[0106] The calibration module is connected to the power divider through a single-pole single-throw switch.

[0107] The power divider is connected to the other end of the single-pole double-throw switch in each receiving branch.

[0108] The receiving branch is connected to the integrated digital unit.

[0109] The integrated digital unit is connected to the transmitting branch.

[0110] The calibration network provided in this application significantly improves the gain stability and imaging quality of the system by optimizing the connection and working principle between the transmitting branch, the receiving branch, the driving amplifier, the phased array antenna module and the calibration module. The calibration module design in this application pays special attention to the stability of the gain, and a flexible and accurate gain control network is formed by introducing multiple single-pole double-throw switches, fixed attenuators and digitally controlled attenuators. Compared with the problem that components such as optical delay devices are greatly affected by temperature in the prior art, this application ensures the stability of the on-orbit gain through fine circuit design and component selection, reduces the gain fluctuation of the system under different working environments, and thus improves the imaging quality of the SAR system. In the prior art, active devices such as optical delay devices are expensive, which increases the development cost of the system. This application optimizes the circuit design and uses lower-cost single-pole double-throw switches and digitally controlled attenuators to achieve the same function, reducing the manufacturing and maintenance costs of the overall system, making the multi-channel SAR system more economical. In the system design of this application, the multipath effect and electromagnetic leakage problems are minimized by reasonably arranging the connection between the transmitting branch and the receiving branch. By optimizing the connection mode of the calibration module, the risk of intra-pulse signal interference is reduced and the anti-interference ability of the entire system is improved. The calibration network provided in this application significantly improves the gain stability and imaging quality of the system.

[0111] Figure 2 A flow chart of a method for determining a calibration network in a multi-channel SAR without delay provided in an embodiment of the present application, the method comprising:

[0112] S201: If the calibration network calibrates the noise signal, the noise signal is calibrated according to the noise signal flow direction corresponding to the noise signal.

[0113] The direction of the noise signal flow can be determined according to the actual situation. In one possible implementation, if the phased array antenna module in the calibration network receives an external noise signal, the noise signal enters the V receiving branch of the T / R component through the antenna unit of the phased array antenna module.

[0114] The V receiving branch sends the noise signal to the first feeding network, and the first feeding network combines the noise signal to obtain a combined noise signal.

[0115] The combined noise signal is sent to multiple driver amplifiers through multiple transceiver channels.

[0116] Each driving amplifier passes the combined noise signal through a circulator and a limiter, and then sends the combined noise signal to the single-pole double-throw switches of the corresponding number of receiving branches through the limiter.

[0117] The combined noise signal received by each receiving branch is processed by a down-converter, and then the integrated digital unit collects each combined noise signal processed by the down-converter to obtain a calibrated noise signal.

[0118] Figure 3 A noise calibration schematic diagram provided in an embodiment of the present application, in Figure 3 In the figure, the dotted line indicates the flow direction of the noise signal. The phased array antenna module does not transmit signals, but only receives external noise signals normally. The noise signal enters the receiving branch of the T / R component V through the antenna unit, and is combined by the first feeding network. After the combination, the signal is output to the driver amplifier 1 / 2 / 3. The direction of the noise signal in the driver amplifier is: circulator → limiter → single-pole double-throw switch S11 / S12 / S13 → receiving branch. The signal flowing into the receiving branch is collected by the integrated digital unit through the down-converter. In the noise calibration mode, the thermal noise of the system is mainly calibrated. The noise energy and distribution characteristics of the noise signal can be obtained by statistical analysis of the collected data, and then the equivalent noise scattering coefficient of the system in the on-orbit test phase can be calculated.

[0119] S202: If the calibration network calibrates the reference signal, the reference signal is calibrated according to the reference signal flow direction corresponding to the reference signal.

[0120] The direction of the reference signal flow can be determined according to actual conditions. In one possible implementation, if the transmitting branch outputs a reference signal, the reference signal couples out a portion of its energy as a coupled signal through the coupler, and the transmitting branch transmits the coupled signal to the third single-pole double-throw switch of the calibration module.

[0121] The coupling signal flows successively through the third single-pole double-throw switch, the first fixed attenuator, the fourth single-pole double-throw switch, the second digitally controlled attenuator, the first digitally controlled attenuator, the sixth single-pole double-throw switch, and the single-pole single-throw switch.

[0122] The coupled signal flows through the power divider via the single-pole single-throw switch, and the coupled signal is divided into multiple intermediate coupled signals by the power divider. The power divider sends each intermediate coupled signal to the single-pole double-throw switch of the corresponding receiving branch.

[0123] The intermediate coupling signal is collected by the integrated digital unit after passing through the down-converter to obtain the calibration reference signal.

[0124] Figure 4 A reference calibration schematic diagram provided in an embodiment of the present application, in Figure 4 In the figure, the dotted line indicates the reference signal flow. In the reference calibration mode, the signal flow is as follows: Figure 4 As shown by the dotted line. The linear frequency modulation signal output by the transmitting branch is coupled out by the coupler and a part of the energy is transmitted to the calibration network. The coupled signal flows through the calibration module and is transmitted to the receiving branch. The signal flow of the calibration module is: single-pole double-throw switch S6→fixed attenuator 1→single-pole double-throw switch S7→digital control attenuator 2→digital control attenuator 1→single-pole double-throw switch S9→single-pole single-throw switch S10→one-to-three power divider→single-pole double-throw switch S11 / S12 / S13→receiving branch. After the reference calibration coupling signal flows into the down-conversion channel of the receiving branch, it is collected by the integrated digital unit. The amplitude and phase characteristics of the receiving branch of the V polarization receiving channel can be obtained by pulse compression of the collected linear frequency modulation signal, thereby judging the changes of the receiving branch when working in orbit.

[0125] S203: If the calibration network calibrates the full array transmit signals, the full array transmit signals are calibrated according to the full array transmit signal flow directions corresponding to the full array transmit signals.

[0126] The direction of the full array transmit signal flow can be determined according to the actual situation. In a possible implementation, if the transmit branch outputs a linear frequency modulation signal, the linear frequency modulation signal is transmitted to a multi-channel drive amplifier, and the linear frequency modulation signal is processed by the multi-channel drive amplifier, and then the circulator outputs multiple full array transmit sub-signals;

[0127] The first feeding network receives multiple full-array transmission sub-signals to form a full-array transmission signal;

[0128] The full array transmit signal is output to the T / R component by the first feed network, and the V transmit branch of the T / R component works.

[0129] The full array transmit signal is delivered to the second feeding network via the coupler of the T / R component.

[0130] The second feeding network transmits the full array transmission signal to the first single-pole double-throw switch of the calibration module through the combiner.

[0131] The full array transmission signal passes through the first single-pole double-throw switch, the second fixed attenuator, the second single-pole double-throw switch, the fourth single-pole double-throw switch, the second digitally controlled attenuator, the first digitally controlled attenuator, the sixth single-pole double-throw switch and the single-pole single-throw switch in sequence.

[0132] The full array transmit signal is sent to the power divider through a single-pole single-throw switch.

[0133] The power divider divides the signals into multiple calibrated full array transmission sub-signals, and transmits the multiple calibrated full array transmission sub-signals to the single-pole double-throw switches of the corresponding receiving branches.

[0134] The calibrated full-array transmission sub-signals in the multiple receiving branches are processed by the down-converter and then collected by the integrated digital unit to obtain the calibrated full-array transmission signal.

[0135] Figure 5 A schematic diagram of full array emission calibration provided in an embodiment of the present application, Figure 5 In the full array transmission calibration mode, the signal flow is as follows: Figure 5 As shown by the dotted line. The linear frequency modulation signal output by the transmitting branch is divided by a one-to-three power divider and then output to a three-way driving amplifier. The driving amplifier finally amplifies the signal and then enters the antenna through a circulator. The linear frequency modulation signal is first output to each T / R component through the feeding network in the antenna. At this time, all channels of the T / R component are in the transmitting working state, and the beam is placed in the normal beam. The signal is coupled to the calibration loop through a coupler in the transmitting branch of the T / R component, and then combined and output to the calibration module through the second feeding network. The signal flow in the calibration module is: single-pole double-throw switch S4→fixed attenuator 2→single-pole double-throw switch S5→single-pole double-throw switch S7→digital control attenuator 2→digital control attenuator 1→single-pole double-throw switch S9→single-pole single-throw switch S10→one-to-three power divider→single-pole double-throw switch S11 / S12 / 13→receiving branch. The full array transmission calibration signal is collected by the integrated digital unit after passing through the receiving branch.

[0136] In the full array transmission calibration mode, the calibration loop reflects the maximum output power of the radar when it is working on orbit. The transmitting branch and the receiving branch work simultaneously, and the non-delay calibration mode is adopted. In order to solve the multipath effect when the transmitting branch and the receiving main path work simultaneously, the three driving amplifiers of the transmitting branch adopt an independent compartment design to reduce signal leakage. The radar transmitting signal is isolated from the receiving branch in the driving amplifier through the circulator, limiter, and single-pole double-throw switch S11 / S12 / S13, which can effectively solve the interference problem of the intra-pulse frequency modulation signal.

[0137] S204: If the calibration network calibrates the full array reception signals, the full array reception signals are calibrated according to the full array reception signal flow directions corresponding to the full array reception signals.

[0138] The direction of the full array receiving signal flow can be determined according to the actual situation. In a possible implementation, the transmitting branch outputs a linear frequency modulation signal, and a part of the energy is coupled out through a coupler as the full array receiving signal. The transmitting branch transmits the full array receiving signal to the third single-pole double-throw switch of the calibration module.

[0139] The whole array receiving signal flows successively through the third single-pole double-throw switch, the fifth single-pole double-throw switch, the sixth single-pole double-throw switch, the first digitally controlled attenuator, the second digitally controlled attenuator, the fourth single-pole double-throw switch, the second single-pole double-throw switch, and the first single-pole double-throw switch.

[0140] The full array receiving signal is transmitted to the combiner of the phased array antenna module through the first single-pole double-throw switch.

[0141] The full array receiving signal is transmitted to the second feeding network through the combiner, and the second feeding network distributes the full array receiving signal to multiple T / R components, and the V receiving branch of each T / R component is in working state.

[0142] Each T / R component processes the full array received signal and transmits it to the first feeding network.

[0143] The first feeding network sends the full array receiving signals processed by the multiple T / R components to the circulators of the multiple driving amplifiers through the transceiver channel.

[0144] The whole array receiving signal flows through the circulator, the limiter and the corresponding single-pole double-throw switch in sequence and is then transmitted to the single-pole double-throw switches of multiple receiving branches.

[0145] The calibrated full-array receiving signals in the multiple receiving branches are processed by the down-converter and then collected by the integrated digital unit to obtain the calibrated full-array receiving signals.

[0146] Figure 6 A schematic diagram of full array receiving calibration provided in an embodiment of the present application, Figure 6 In the full array transmission calibration mode, the signal flow is as follows: Figure 6 As shown by the dotted line. The linear frequency modulation signal output by the transmitting branch is coupled out by the coupler and a part of the energy is transmitted to the internal calibration network. The coupled signal flows through the calibration module and is transmitted to the antenna. The signal flow of the calibration module is: single-pole double-throw switch S6→single-pole double-throw switch S8→single-pole double-throw switch S9→digital control attenuator 1→digital control attenuator 2→single-pole double-throw switch S7→single-pole double-throw switch S5→single-pole double-throw switch S4→antenna. The full array receiving calibration signal is distributed to each T / R component after passing through the first feeding network in the antenna. At this time, all channels of the T / R component are in the receiving working state, and the beam is placed in the normal beam. After being amplified in the receiving branch of the T / R component, the signal is combined and output to the power amplifier unit through the second feeding network. The full array receiving calibration signal is transmitted to the receiving branch after passing through the circulator, limiter and single-pole double-throw switch S11 / S12 / S13 in the driving amplifier, and is collected by the integrated digital unit.

[0147] In the full array receiving calibration mode, the calibration loop reflects the maximum receiving gain of the radar system when it is working on orbit. At the same time, according to the amplitude and phase characteristics of the echo data of each receiving channel, the amplitude and phase errors of the multi-channel spaceborne SAR are compensated on orbit.

[0148] In order to ensure the quality of SAR imaging, the amplitude and phase differences between multiple channels obtained in the full array calibration mode are compensated. The specific steps are as follows:

[0149] Step 1: The amplitude and phase values ​​of the three receiving channels are measured in turn through the full array receiving calibration network, which are recorded as , , , are polarization type and number of channels respectively;

[0150] Step 2: For the VV polarization channel, normalize the amplitude and phase with channel 1 as the reference, and obtain , ;

[0151] Step 3: For the VV polarization channel, use the normalized amplitude and The echo data of the corresponding channel is compensated and then SAR imaging processing is performed.

[0152] S205: If the calibration network calibrates the single T / R transmission signal, the single T / R transmission signal is calibrated according to the single T / R transmission signal flow direction corresponding to the single T / R transmission signal.

[0153] The flow direction of a single T / R transmitting signal can be determined according to actual conditions. In a possible implementation, if the linear frequency modulation signal output by the transmitting branch is processed by the circulator of the driving amplifier and then enters the first feeding network, a single T / R transmitting signal is obtained.

[0154] A single T / R transmit signal enters one T / R assembly through a first feed network.

[0155] The single T / R transmit signal enters the second feed network through the coupler of the T / R assembly.

[0156] The single T / R transmission signal is processed by the second feeding network and then enters the first single-pole double-throw switch of the calibration module through the combiner.

[0157] The single T / R transmitting signal flows successively through the first single-pole double-throw switch, the second single-pole double-throw switch, the fourth single-pole double-throw switch, the second digitally controlled attenuator, the first digitally controlled attenuator, the sixth single-pole double-throw switch, and the single-pole single-throw switch.

[0158] The single T / R transmit signal enters the power divider through a single-pole single-throw switch.

[0159] The single T / R transmit signal enters the single-pole double-throw switch of multiple receiving branches through the power divider.

[0160] The single T / R transmission signal enters the down-converter through the single-pole double-throw switches of multiple receiving branches, and is collected by the integrated digital unit after being processed by the down-converter to obtain the calibrated single T / R transmission signal.

[0161] Figure 7A schematic diagram of a single T / R transmission calibration provided in an embodiment of the present application, Figure 7 In the single T / R transmission calibration mode, the signal flow is as follows Figure 7 As shown by the dotted line. The linear frequency modulation signal output by the transmitting branch is divided by a one-to-three power divider and then output to a three-way V polarization drive amplifier. The drive amplifier finally amplifies the signal and then enters the antenna through a circulator. The linear frequency modulation signal is output to the T / R component through the first feeding network in the antenna. At this time, the single T / R component transmission channel is in working state, and all T / R component transmission channels are traversed in turn, and the beam is placed in the normal beam. The single T / R transmission calibration signal is coupled to the calibration module through a coupler in the T / R component transmission branch, and then output to the calibration module through the second feeding network. The signal flow in the calibration module is: single-pole double-throw switch S4→single-pole double-throw switch S5→single-pole double-throw switch 7→digital control attenuator 2→digital control attenuator 1→single-pole double-throw switch S9→single-pole single-throw switch S10→one-to-three power divider→single-pole double-throw switch S11 / S12 / S13→receiving branch. The single T / R transmit calibration signal is collected by the integrated digital unit after passing through the receiving branch.

[0162] In the single T / R transmit calibration mode, the calibration loop reflects the amplitude, phase and other information of each T / R component channel when the radar is working on orbit, which can be used to judge whether the T / R component transmit channel is working normally.

[0163] S206: If the calibration network calibrates the single T / R receiving signal, the single T / R receiving signal is calibrated according to the flow direction of the noise signal corresponding to the single T / R receiving signal.

[0164] The flow direction of the single T / R receiving signal can be determined according to the actual situation. In a possible implementation, if the linear frequency modulation signal output by the transmitting branch is coupled out with a part of the energy as the single T / R receiving signal through the coupler of the transmitting branch;

[0165] The single T / R receiving signal enters the third single-pole double-throw switch of the calibration module through the coupler.

[0166] The single T / R receiving signal flows successively through the third single-pole double-throw switch, the fifth single-pole double-throw switch, the sixth single-pole double-throw switch, the first digitally controlled attenuator, the second digitally controlled attenuator, the fourth single-pole double-throw switch, the second single-pole double-throw switch and the first single-pole double-throw switch.

[0167] The single T / R receiving signal enters the combiner of the phased array antenna module through the first single-pole double-throw switch.

[0168] A single T / R receiving signal enters the second feeding network through the combiner and is distributed by the second feeding network to a coupler of a T / R component, and the V receiving channel of the T / R component works.

[0169] A single T / R receiving signal flows through the first feeding network, is processed by the first feeding network, and then enters a circulator of a driving amplifier through a transceiver channel.

[0170] After the single T / R receiving signal flows through the circulator and the limiter of the driving amplifier, the limiter outputs the signal to the single-pole double-throw switch of the corresponding receiving branch.

[0171] The single T / R receiving signal enters the down-converter through the single-pole double-throw switch of the receiving branch, and is collected by the integrated digital unit after being processed by the down-converter to obtain a calibrated single T / R receiving signal.

[0172] Figure 8 A schematic diagram of a single T / R receiving calibration provided in an embodiment of the present application, Figure 8 In the single T / R receiving calibration mode, the signal flow is as follows Figure 8 As shown by the dotted line. The linear frequency modulation signal output by the transmitting branch is coupled out by the coupler and a part of the energy is transmitted to the calibration network. The coupled signal flows through the calibration module and is transmitted to the antenna. The signal flow of the calibration module is: single-pole double-throw switch S6→single-pole double-throw switch S8→single-pole double-throw switch S9→digital control attenuator 1→digital control attenuator 2→single-pole double-throw switch S7→single-pole double-throw switch S5→single-pole double-throw switch S4→antenna. The single T / R receiving calibration signal is distributed to each T / R component after passing through the second feeding network in the antenna. At this time, the receiving channel of a single T / R component is in working state, and all the receiving channels of the T / R components are traversed in turn, and the beam is placed in the normal beam. The single T / R receiving calibration signal is amplified in the receiving branch of the T / R component and output to the driving amplifier through the first feeding network. In the driving amplifier, it is transmitted to the receiving branch after passing through the circulator, limiter and single-pole double-throw switch S11 / S12 / S13, and collected by the integrated digital unit.

[0173] In the single T / R receiving calibration mode, the calibration loop reflects the receiving gain, phase and other information of the receiving channel of a single T / R component when the radar system is working on orbit, which can be used to judge whether the receiving channel of the T / R component is working normally.

[0174] The method provided in the present application uses the calibration network provided in the present application. The calibration network significantly improves the gain stability and imaging quality of the system by optimizing the connection and working principle between the transmitting branch, the receiving branch, the driving amplifier, the phased array antenna module and the calibration module. The calibration module design in the present application pays particular attention to the stability of the gain. By introducing multiple single-pole double-throw switches, fixed attenuators and digitally controlled attenuators, a flexible and accurate gain control network is formed. Compared with the problem that components such as optical delay devices are greatly affected by temperature in the prior art, the present application ensures the stability of the on-orbit gain through fine circuit design and component selection, reduces the gain fluctuation of the system under different working environments, and thus improves the imaging quality of the SAR system. In the prior art, active devices such as optical delay devices are expensive, which increases the development cost of the system. The present application optimizes the circuit design and uses lower-cost single-pole double-throw switches and digitally controlled attenuators to achieve the same function, reducing the manufacturing and maintenance costs of the overall system, making the multi-channel SAR system more economical. In the system design of the present application, the multipath effect and electromagnetic leakage problems are minimized by reasonably arranging the connection between the transmitting branch and the receiving branch. By optimizing the connection mode of the calibration module, the risk of intra-pulse signal interference is reduced and the anti-interference ability of the entire system is improved. The calibration network provided in this application significantly improves the gain stability and imaging quality of the system.

[0175] An embodiment of the present application also provides a multi-channel SAR non-delay calibration network determination device, wherein the device includes a memory and a processor, the memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device performs the steps of the multi-channel SAR non-delay calibration network determination method described in any embodiment of the present application.

[0176] In practical applications, the computer-readable storage medium may be any combination of one or more computer-readable media, which may be a computer-readable signal medium or a computer-readable storage medium.

[0177] The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, device, or device.

[0178] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0179] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0180] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0181] It should be noted that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The device embodiment described above is merely schematic, in which the unit described as a separate component may or may not be physically separated, and the component prompted as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0182] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A multi-channel SAR non-delay calibration network, characterized in that: include: A transmitting branch, multiple receiving branches, multiple driver amplifiers, a phased array antenna module, a calibration module, a power divider and an integrated digital unit; The transmitting branch includes an up-converter and a coupler, and the up-converter is connected to the coupler; One of the receiving branches includes a down converter and a single-pole double-throw switch, and the single-pole double-throw switch is connected to the down converter; A driving amplifier includes a power amplifier, a circulator and a limiter, wherein the power amplifier is connected to the circulator, and the circulator is connected to the limiter; The phased array antenna module includes a first feed network, a second feed network, a plurality of T / R components, an antenna unit and a combiner, wherein the first feed network is connected to the T / R component, the T / R component is connected to the second feed network, the second feed network is connected to the combiner, and one of the T / R components includes a V transmitting branch and a V receiving branch; The calibration module includes six single-pole double-throw switches, one single-pole single-throw switch, two fixed attenuators and two digitally controlled attenuators, the first single-pole double-throw switch is connected to the second fixed attenuator and the second single-pole double-throw switch, the second single-pole double-throw switch is connected to the fourth single-pole double-throw switch, the fourth single-pole double-throw switch is connected to the first fixed attenuator and the second digitally controlled attenuator, the first fixed attenuator is connected to the third single-pole double-throw switch, the third single-pole double-throw switch is connected to the fifth single-pole double-throw switch, the fifth single-pole double-throw switch is connected to the sixth single-pole double-throw switch, the sixth single-pole double-throw switch is connected to the single-pole single-throw switch and the first digitally controlled attenuator, and the first digitally controlled attenuator is connected to the second digitally controlled attenuator; The transmitting branch is connected to the power amplifiers of the plurality of driving amplifiers, and the limiter of one driving amplifier is connected to one end of the single-pole double-throw switch of one receiving branch; The circulator of each of the driving amplifiers is connected to the first feeding network via a transceiver channel; The coupler of the sending branch is connected to the third single-pole double-throw switch of the calibration module; The phased array antenna module is connected to the first single-pole double-throw switch of the calibration module through the combiner; The calibration module is connected to the power divider via a single-pole single-throw switch; The power divider is connected to the other end of the single-pole double-throw switch in each receiving branch; The receiving branch is connected to the integrated digital unit; The integrated digital unit is connected to the transmitting branch.

2. A method for determining a calibration network in a multi-channel SAR without delay, applied to the calibration network described in claim 1, characterized in that: include: If the calibration network calibrates the noise signal, the noise signal is calibrated according to the noise signal flow direction corresponding to the noise signal; If the calibration network calibrates the reference signal, calibrating the reference signal according to the reference signal flow direction corresponding to the reference signal; If the calibration network calibrates the full array transmit signal, calibrate the full array transmit signal according to the full array transmit signal flow direction corresponding to the full array transmit signal; If the calibration network calibrates the full array reception signal, the full array reception signal is calibrated according to the full array reception signal flow direction corresponding to the full array reception signal; If the calibration network calibrates a single T / R transmission signal, calibrating the single T / R transmission signal according to a single T / R transmission signal flow direction corresponding to the single T / R transmission signal; If the calibration network calibrates a single T / R received signal, the single T / R received signal is calibrated according to the flow direction of the noise signal corresponding to the single T / R received signal.

3. The method according to claim 2, characterized in that If the calibration network calibrates the noise signal, calibrating the noise signal according to the noise signal flow direction corresponding to the noise signal includes: If the phased array antenna module in the calibration network receives an external noise signal, the noise signal enters the V receiving branch of the T / R component through the antenna unit of the phased array antenna module; The V receiving branch sends the noise signal to the first feeding network, and the first feeding network combines the noise signal to obtain a combined noise signal; The combined noise signal is sent to multiple drive amplifiers through multiple transceiver channels; Each of the driving amplifiers passes the combined noise signal through a circulator and a limiter, and then sends the combined noise signal to a corresponding number of single-pole double-throw switches of receiving branches through the limiter; The combined noise signal received by each receiving branch is processed by a down-converter, and then the integrated digital unit collects each combined noise signal processed by the down-converter to obtain a calibrated noise signal.

4. The method according to claim 2, characterized in that If the calibration network calibrates the reference signal, calibrating the reference signal according to the reference signal flow direction corresponding to the reference signal includes: If the transmitting branch outputs a reference signal, the reference signal couples a portion of energy through the coupler as a coupled signal, and the transmitting branch transmits the coupled signal to a third single-pole double-throw switch of the calibration module; The coupling signal flows successively through the third single-pole double-throw switch, the first fixed attenuator, the fourth single-pole double-throw switch, the second digitally controlled attenuator, the first digitally controlled attenuator, the sixth single-pole double-throw switch, and the single-pole single-throw switch; The coupling signal flows through the power divider via a single-pole single-throw switch, the coupling signal is divided into multiple intermediate coupling signals by the power divider, and the power divider sends each intermediate coupling signal to the single-pole double-throw switch of the corresponding receiving branch; The intermediate coupling signal is collected by the integrated digital unit after passing through the down-converter to obtain the calibration reference signal.

5. The method according to claim 2, characterized in that: If the calibration network calibrates the full array transmit signal, the full array transmit signal is calibrated according to the full array transmit signal flow direction corresponding to the full array transmit signal; If the transmitting branch outputs a linear frequency modulation signal, the linear frequency modulation signal is transmitted to a multi-channel driving amplifier, the linear frequency modulation signal is processed by the multi-channel driving amplifier, and then the circulator outputs a multi-channel full-array transmitting sub-signal; The first feeding network receives multiple full-array transmission sub-signals to form a full-array transmission signal; The full array transmission signal is output by the first feeding network to the T / R component, and the V transmission branch of the T / R component works; The full array transmission signal is transmitted to the second feeding network via the coupler of the T / R component; The second feeding network transmits the full array transmission signal to the first single-pole double-throw switch of the calibration module through the combiner; The full array transmission signal passes through the first single-pole double-throw switch, the second fixed attenuator, the second single-pole double-throw switch, the fourth single-pole double-throw switch, the second digitally controlled attenuator, the first digitally controlled attenuator, the sixth single-pole double-throw switch and the single-pole single-throw switch in sequence; The full array transmission signal is transmitted to the power divider through a single-pole single-throw switch; The power divider divides the signals into multiple calibrated full array transmission sub-signals, and transmits the multiple calibrated full array transmission sub-signals to the corresponding single-pole double-throw switches of the receiving branches; The calibrated full-array transmission sub-signals in the plurality of receiving branches are processed by the down-converter and collected by the integrated digital unit to obtain the calibrated full-array transmission signal.

6. The method according to claim 2, characterized in that If the calibration network calibrates the full array received signal, calibrating the full array received signal according to the full array received signal flow direction corresponding to the full array received signal includes: The transmitting branch outputs a linear frequency modulation signal and couples a part of the energy through a coupler as a full array receiving signal, and the transmitting branch transmits the full array receiving signal to a third single-pole double-throw switch of the calibration module; The full array receiving signal flows successively through the third single-pole double-throw switch, the fifth single-pole double-throw switch, the sixth single-pole double-throw switch, the first digitally controlled attenuator, the second digitally controlled attenuator, the fourth single-pole double-throw switch, the second single-pole double-throw switch, and the first single-pole double-throw switch; The full array receiving signal is transmitted to the combiner of the phased array antenna module through a first single-pole double-throw switch; The full array receiving signal is transmitted to the second feeding network through the combiner, and the second feeding network distributes the full array receiving signal to multiple T / R components, and the V receiving branch of each T / R component is in working state; Each of the T / R components processes the full array reception signal and transmits it to the first feeding network; The first feed network sends the full array reception signals processed by the multiple T / R components to the circulators of the multiple driver amplifiers through the transceiver channel; The full array receiving signal flows through the circulator, the limiter and the corresponding single-pole double-throw switch in sequence and is then transmitted to the single-pole double-throw switches of multiple receiving branches; The calibrated full-array received signals in the plurality of receiving branches are processed by the down-converter and then collected by the integrated digital unit to obtain the calibrated full-array received signals.

7. The method according to claim 2, characterized in that: If the calibration network calibrates the single T / R transmission signal, calibrating the single T / R transmission signal according to the single T / R transmission signal flow direction corresponding to the single T / R transmission signal includes: If the linear frequency modulation signal output by the transmitting branch is processed by the circulator of the driving amplifier and then enters the first feeding network to obtain a single T / R transmitting signal; The single T / R transmit signal enters a T / R component through a first feed network; The single T / R transmission signal enters the second feeding network through the coupler of the T / R component; The single T / R transmission signal is processed by the second feed network and then enters the first single-pole double-throw switch of the calibration module through the combiner; The single T / R transmission signal flows successively through the first single-pole double-throw switch, the second single-pole double-throw switch, the fourth single-pole double-throw switch, the second digitally controlled attenuator, the first digitally controlled attenuator, the sixth single-pole double-throw switch, and the single-pole single-throw switch; The single T / R transmission signal enters the power divider through a single-pole single-throw switch; The single T / R transmission signal enters the single-pole double-throw switch of multiple receiving branches through the power divider; The single T / R transmission signal enters the down-converter through the single-pole double-throw switches of multiple receiving branches, and is collected by the integrated digital unit after being processed by the down-converter to obtain a calibrated single T / R transmission signal.

8. The method according to claim 2, characterized in that: If the calibration network calibrates the single T / R received signal, calibrating the single T / R received signal according to the signal flow direction corresponding to the single T / R received signal includes: If the linear frequency modulation signal output by the transmitting branch is coupled out a part of the energy through the coupler of the transmitting branch as a single T / R receiving signal; The single T / R receiving signal enters the third single-pole double-throw switch of the calibration module through the coupler; The single T / R receiving signal flows successively through the third single-pole double-throw switch, the fifth single-pole double-throw switch, the sixth single-pole double-throw switch, the first digitally controlled attenuator, the second digitally controlled attenuator, the fourth single-pole double-throw switch, the second single-pole double-throw switch and the first single-pole double-throw switch; The single T / R receiving signal enters the combiner of the phased array antenna module through the first single-pole double-throw switch; The single T / R receiving signal enters the second feeding network through the combiner and is distributed by the second feeding network to the coupler of a T / R component, and the V receiving channel of the T / R component works; The single T / R receiving signal flows through the first feeding network, and after being processed by the first feeding network, enters a circulator of a driving amplifier through a transceiver channel; After the single T / R receiving signal flows through the circulator and limiter of the driving amplifier, the limiter outputs the signal to the single-pole double-throw switch of the corresponding receiving branch; The single T / R receiving signal enters the down-converter through the single-pole double-throw switch of the receiving branch, and is collected by the integrated digital unit after being processed by the down-converter to obtain a calibrated single T / R receiving signal.

9. An electronic device, characterized in that: comprising a memory and a processor, wherein: The memory is used to store the computer program; The processor is used to execute the computer program to implement the multi-channel SAR non-delay calibration network determination method as described in any one of claims 2-8.

10. A computer-readable storage medium, characterized in that: Used to store a computer program, wherein when the computer program is executed by a processor, the method for determining a multi-channel SAR non-delay intra-calibration network is implemented as described in any one of claims 2 to 8.

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