CN115561711B - Multi-channel cold backup method applied to synthetic aperture radar system - Google Patents
Multi-channel cold backup method applied to synthetic aperture radar system Download PDFInfo
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- CN115561711B CN115561711B CN202211437305.XA CN202211437305A CN115561711B CN 115561711 B CN115561711 B CN 115561711B CN 202211437305 A CN202211437305 A CN 202211437305A CN 115561711 B CN115561711 B CN 115561711B
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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
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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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
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
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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
- G01S7/35—Details of non-pulse systems
- G01S7/352—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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention provides a multi-channel cold backup method applied to a synthetic aperture radar system.A same receiving module is divided into three groups, the three groups are interconnected with a cross backup unit, any two receiving modules can be powered up through a power supply unit, and the switching of a signal input port is completed by controlling a switch in the receiving module, so that the 2-standby-1 cold backup design of the three receiving modules is realized. The invention ensures that the power supply unit and the receiving module do not need to work correspondingly one by one with the main and standby modules, thereby improving the backup reliability.
Description
Technical Field
The invention belongs to the technical field of synthetic aperture radar systems, and particularly relates to a multi-channel cold backup method applied to a synthetic aperture radar system.
Background
With the development of space technology, competition of space detection in various countries is becoming fierce, and a satellite-borne Synthetic Aperture Radar (SAR) can not be influenced by weather environment, climate and the like, can carry out earth observation with all weather and high resolution, and has become one of the important research directions of satellite main loads at present. Due to the particularity that the satellite-borne radar system cannot be maintained in an on-orbit mode, the single machine in the system needs to be designed in a cross backup mode. In the traditional cross backup design, a 1-backup-1 cold backup method is adopted, namely two functional modules which are identical are designed, one functional module is used as a master functional module to be powered on normally, and the other functional module is used as a cold backup to be not powered on. When the master functional module fails, the backup functional module is powered on to replace the master to work.
The disadvantages of the conventional 1-standby-1 cold backup mode are: the method is suitable for being applied to single machines with relatively few functional modules, for example, radar receivers, and is more suitable for being applied to receivers with fewer receiving channels. However, with the development of new systems, high resolution, wide swath and spaceborne SAR technologies, radar receivers are also developed to multiple receiving channels. If the 1-standby-1 cold backup scheme is adopted, the number of backup receiving channels is too large, the cost is increased, the size and the weight of a single machine are also increased in multiples, and the development trend of light weight and miniaturization is not met. Secondly, in the traditional 1 backup 1 cold backup mode, the main functional modules and the backup functional modules are in one-to-one correspondence, so that the backup function of the modules is limited. Also taking a radar receiver as an example, in the radar receiver adopting 1 backup 1 cold backup, a master power module, a backup power module, a master receiving module and a backup receiving module are provided, the master power module only supplies power for the master receiving module, the backup power module only supplies power for the backup receiving module, and when the master receiving module fails and the backup receiving module needs to be replaced, even if the master power module is normal in function, the backup power module needs to be switched to supply power for the backup receiving module, so that the backup efficiency is reduced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a multi-channel cold backup method applied to a synthetic aperture radar system, wherein the same receiving modules are in a group of three and are interconnected with a cross backup unit, any two receiving modules can be powered up through a power supply unit, and the switching of signal input ports is completed by controlling switches in the receiving modules, so that the 2-standby-1 cold backup design of the three receiving modules is realized.
In order to achieve the purpose, the invention adopts the technical scheme that:
a multi-channel cold backup method applied to a synthetic aperture radar system is characterized in that three same receiving modules are in a group and are interconnected with a cross backup unit, any two of the three same receiving modules are powered on through a power supply unit, and the switching of signal input ports is completed by controlling switches in the receiving modules, so that the three receiving modules are provided with 2 backup 1 cold backups, wherein the 2 backup 1 cold backups are that two receiving modules in the three receiving modules serve as masters, one receiving module serves as a cold backup, and when any one of the two receiving modules serving as the masters fails, the receiving module serving as the cold backup can replace the failed receiving module serving as the master to work, so that only one receiving module is needed for backing up for the two receiving modules.
Furthermore, the power supply unit comprises a main power supply module and a standby power supply module which are the same, and also comprises a power supply distribution network formed by a first relay switch, a second relay switch and a third relay switch; the first relay switch is switched to the main power supply module, and the second relay switch and the third relay switch are switched to the first power supply and the third power supply of three identical receiving modules in the cross backup unit; if the first or the third of the three same receiving modules fails to work, the second relay switch and the third relay switch are switched to be powered on to the second or the third of the three same receiving modules or to be powered on to the first or the second of the three same receiving modules, and the first relay switch keeps the main power supply module to work.
Furthermore, the receiving module has only one signal transmission link, and includes a first signal input port, a second signal input port, a first signal output port, and a second signal output port.
Furthermore, a single-pole double-throw switch is arranged at the input front end of the signal transmission link of each receiving module, and the link is switched to the first signal input port or the second signal input port through control signal selection; the single-pole double-throw switch is arranged at the rear output end of each receiving module, when the single-pole double-throw switch at the front input end of the signal transmission link is switched to the first signal input port, the single-pole double-throw switch at the rear output end of the signal transmission link is switched to the first signal output port, and when the single-pole double-throw switch at the front input end of the signal transmission link is switched to the second signal input port, the single-pole double-throw switch at the rear output end of the signal transmission link is switched to the second signal output port.
Further, the cross backup unit comprises a first input port, a second input port, a third input port, a fourth input port, a fifth input port, a sixth input port, a first output port, a second output port, a third output port, and a fourth output port; the first input port and the sixth input port are connected with a 50 omega load; two power combining/power dividing circuits are arranged in the cross backup unit, input ports of the first power combining/power dividing circuit are a second input port and a third input port, output ports of the first power combining/power dividing circuit are a first output port and a second output port, input ports of the second power combining/power dividing circuit are a fourth input port and a fifth input port, and output ports of the second power combining/power dividing circuit are a third output port and a fourth output port; when one path of signal input is arranged at the second input port or the third input port, the first output port and the second output port simultaneously output signals with equal amplitude and same phase, and when the second input port and the third input port do not have the same signal input, the signals are input; when one path of signal input exists at the fourth input port or the fifth input port, the third output port and the fourth output port simultaneously output signals with equal amplitude and same phase, and the fourth input port and the fifth input port cannot simultaneously have signal input.
Further, the three identical receiving modules are interconnected with a cross-backup unit; a first signal input port of a first one of the three identical receiving modules is connected with a 50 omega load and has no signal input, and a first signal output port and a second signal output port of the first one of the three identical receiving modules are respectively connected with a first input port and a second input port of the cross backup unit; the first and second signal output ports of the second of the three same receiving modules are respectively connected with the third input port and the fourth input port of the cross backup unit; the second signal input port of the third of the three identical receiving modules is connected with a 50 omega load, no signal is input, and the first signal output port and the second signal output port of the third receiving module are respectively connected with the fifth input port and the sixth input port of the cross backup unit.
Furthermore, there are three groups of the three same receiving modules, that is, nine receiving modules, and each group is connected to a cross backup unit.
Furthermore, under the normal working state of the radar receiver, the first and the third of the three same receiving modules work as main receiving modules; a first relay switch in the power supply unit is switched to the main power supply module, a second relay switch and a third relay switch are switched to the first power-on and the third power-on of the three same receiving modules, and the second power-off of the three same receiving modules; the single-pole double-throw switch at the input front end of the signal transmission link of the first of the three identical receiving modules is switched to the second input port of the single-pole double-throw switch, the single-pole double-throw switch at the output rear end of the signal transmission link of the first of the three identical receiving modules is switched to the second signal output port of the single-pole double-throw switch, a first radio-frequency main signal input by a preceding-stage system enters the first of the three identical receiving modules from the second signal input port of the first radio-frequency main signal, is amplified, filtered and frequency-converted by the signal transmission link of the first of the three identical receiving modules, is converted into an intermediate-frequency signal, and is output to the second input port of the cross backup unit from the second signal output port of the first radio-frequency main signal; the intermediate frequency signal enters the power on/power off circuit through a second input port of the cross backup unit, and finally two paths of intermediate frequency signals with equal amplitude and in phase are output at a first output port and a second output port of the cross backup unit and transmitted to a signal processing single machine at the later stage; the single-pole double-throw switch at the input front end of a signal transmission link of a third receiving module is switched to a first signal input port, the single-pole double-throw switch at the output rear end is switched to a first signal output port, a second radio frequency main signal input by a front-stage system enters the third receiving module through the first signal input port, is processed into an intermediate frequency signal and then is output to a fifth input port of a cross backup unit through the first signal output port, and finally two paths of intermediate frequency signals with equal amplitude and same phase are output at the third output port of the cross backup unit and a fourth output port of the cross backup unit.
Further, when a first of the three identical receiving modules fails to work normally, the first relay switch in the power supply unit is still switched to the main power supply module, the second relay switch and the third relay switch are switched to power on the second receiving module and the third receiving module, and the first receiving module is powered off; the working state of the third of the three identical receiving modules is unchanged; the single-pole double-throw switch at the input front end of the signal transmission link of the second of the three identical receiving modules is switched to the first signal input port of the single-pole double-throw switch, the single-pole double-throw switch at the output rear end of the signal transmission link is switched to the first signal output port of the single-pole double-throw switch, a first radio frequency standby signal input by a preceding stage system enters the second of the three identical receiving modules from the first signal input port of the preceding stage system, is amplified, filtered and frequency-converted by the signal transmission link of the preceding stage system, is converted into an intermediate frequency signal, and is output to the third input port of the cross backup unit from the first signal output port of the preceding stage system; the intermediate frequency signal enters the power on/power off circuit through a third input port of the cross backup unit, and finally two paths of intermediate frequency signals with equal amplitude and same phase are output at a first output port of the cross backup unit and a second output port of the cross backup unit and transmitted to a signal processing single machine at the later stage; at this time, the second of the three identical receiving modules replaces the first of the failed three identical receiving modules as a backup.
Further, when a third one of the three identical receiving modules fails to work normally, the first relay switch in the power supply unit is still switched to the main power supply module, the second relay switch and the third relay switch are switched to power on the first one and the second one of the three identical receiving modules, and the third one of the three identical receiving modules is powered off; the working state of the first of the three identical receiving modules is unchanged; the single-pole double-throw switch at the input front end of the signal transmission link of the second of the three same receiving modules is switched to the second signal input port of the signal transmission link, the single-pole double-throw switch at the output rear end is switched to the second signal output port of the signal transmission link, a second radio frequency standby signal input by the front-stage system enters the second of the three same receiving modules from the second signal input port of the front-stage system, is amplified, filtered and frequency-converted by the signal transmission link, is converted into an intermediate frequency signal, and is output to the fourth input port of the cross backup unit from the second signal output port of the front-stage system; the intermediate frequency signal enters the power on/power off circuit through a fourth input port of the cross backup unit, and finally two paths of intermediate frequency signals with equal amplitude and same phase are output at a third output port of the cross backup unit and a fourth output port of the cross backup unit and transmitted to a signal processing single machine at the later stage; at this time, the second of the three identical receiving modules replaces the third of the failed three identical receiving modules as a backup.
Has the advantages that:
(1) The power supply unit comprises a main power module U1, a standby power module U2 and a power supply distribution network formed by 7 relay switches S1-S7. Under the normal working condition, the relay switch S1 is switched to the main power supply module U1, and the relay switches S2 and S3 are switched to the receiving modules A1 and A3 to be powered on; if the A1 or the A3 fails and cannot work, when the backup module A2 needs to be switched, the relay switch S1 keeps the main power supply module to work only by switching the relay switches S2 and S3 to the power-on of the A1 and A2 or the power-on of the A2 and A3; only when the main power supply module U1 fails, the relay switch S1 is switched to the standby power supply module U2. Similarly, any two of the A1A2A3 modules may still be powered up while the standby power module U2 is operating. According to the mode, the power supply unit and the receiving module do not need to work in a primary-standby one-to-one correspondence mode, and the backup reliability is improved.
(2) The three receiving modules of the invention are connected with a cross backup unit. Each receiving module is provided with two input ports and two output ports, and two single-pole double-throw switches in the receiving module can control the ports for transmitting signal input and output by switching the switches. Two groups of power combining/power dividing circuits are arranged in the cross backup unit, one input port of one group of power combining/power dividing circuits is provided with a signal input, and two output ports of the one group of power combining/power dividing circuits can output signals with equal amplitude and same phase. Connecting an output port of the main module A1 and an output port of the standby module A2 to two input ports of a group of power combining/power dividing circuits, so that the power combining/power dividing circuits output signals no matter the main module A1 or the standby module A2 outputs signals; similarly, one output port of the module A3 and the other output port of the standby module A2 are connected to two input ports of another set of power combining/power dividing circuit, so that the power combining/power dividing circuit outputs signals no matter the module A3 or the standby module A2 outputs signals. When the main module A1 and the module A3 work normally, the standby module A2 does not work as a cold backup; when the main module A1 or the module A3 has a fault, the standby module A2 can replace any one of the modules to work. According to the method, the design that one module backs up two modules is realized, compared with the traditional 1-to-1 cold backup method, the number of the backup modules is reduced by half, the cost of a single machine is reduced, and the weight and the size of the single machine are also reduced.
Drawings
FIG. 1 is a schematic diagram of the interconnection of functional blocks of a multi-channel radar receiver;
FIG. 2 is a schematic diagram of a power supply distribution network for a power supply unit;
FIG. 3 is a schematic diagram of a receive module;
FIG. 4 is a schematic diagram of a cross-backup unit;
fig. 5 is a schematic diagram of a 2-to-1 cold backup implementation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The composition and interconnection mode of each functional module of the multichannel radar receiver are shown in figure 1, a power supply unit D1 supplies power to first-ninth receiving modules A1-A9, and 3 receiving modules are interconnected with first-third cross backup units B1, B2 and B3 in one group.
As shown in fig. 2, the power supply unit includes a main power supply module U1 and a standby power supply module U2, which are the same, and a power supply distribution network formed by first to seventh relay switches S1 to S7. Under the normal working condition, the first relay switch S1 is switched to the main power supply module U1, and the second relay switch S2 and the third relay switch S3 are switched to the first receiving module A1 and the third receiving module A3 to be powered on; if the first receiving module A1 or the third receiving module A3 fails to work and needs to be switched to the second receiving module A2 for backup, only the second relay switch S2 and the third relay switch S3 need to be switched to power on the second receiving module A2 and the third receiving module A3 or power on the first receiving module A1 and the second receiving module A2; in the same manner, the fourth and fifth relay switches S4 and S5 may power up any two of the fourth, fifth and sixth receiving modules A4, A5 and A6, and the sixth and seventh relay switches S6 and S7 may power up any two of the seventh, eighth and ninth receiving modules A7, A8 and A9; the first relay switch S1 keeps the main power supply module U1 working; only when the main power supply module U1 fails, the first relay switch S1 is switched to the standby power supply module U2. Similarly, when the standby power supply module U2 is operating, any two of the first, second, and third receiving modules A1, A2, and A3 may still be powered on. According to the mode, the power supply unit and the receiving module do not need to work in a primary-standby one-to-one correspondence mode, and the backup reliability is improved.
Fig. 3 shows a schematic diagram of the first receiving module A1, where the first receiving module A1 has only one signal transmission link, but has a first signal input port P11 of the first receiving module, a second signal input port P12 of the first receiving module, a first signal output port P13 of the first receiving module, and a second signal output port P14 of the first receiving module. The input front end of the signal transmission link of the first receiving module is designed with a single-pole double-throw switch C1, and the link can be switched to the first signal input port P11 of the first receiving module or the second signal input port P12 of the first receiving module through selection of a control signal. The single-pole double-throw switch C1 is also designed at the output rear end of the signal transmission link of the first receiving module A1, when the single-pole double-throw switch C1 at the input front end of the signal transmission link is switched to the first signal input port P11 of the first receiving module, the single-pole double-throw switch C1 at the output rear end of the signal transmission link is switched to the first signal output port P13 of the first receiving module, and when the single-pole double-throw switch C1 at the input front end of the signal transmission link is switched to the second signal input port P12 of the first receiving module, the single-pole double-throw switch C1 at the output rear end of the signal transmission link is switched to the second signal output port P14 of the first receiving module. The second receiving module A2, the third receiving module A3, the fourth receiving module A4, the fifth receiving module A5, the sixth receiving module A6, the seventh receiving module A7, the eighth receiving module A8, and the ninth receiving module A9 have the same structure and principle as the first receiving module A1.
Fig. 4 shows a schematic diagram of the first cross backup unit B1, where the first cross backup unit B1 includes a first input port O11 of the first cross backup unit, a second input port O12 of the first cross backup unit, a third input port O13 of the first cross backup unit, a fourth input port O14 of the first cross backup unit, a fifth input port O15 of the first cross backup unit, a sixth input port O16 of the first cross backup unit, a first output port O17 of the first cross backup unit, a second output port O18 of the first cross backup unit, a third output port O19 of the first cross backup unit, and a fourth output port O10 of the first cross backup unit. The first input port O11 of the first cross-backup unit and the sixth input port O16 of the first cross-backup unit are connected to a 50 Ω load. The first cross backup unit B1 has two sets of power combining/power dividing circuits, the input ports of the first set of power combining/power dividing circuits are the second input port O12 of the first cross backup unit and the third input port O13 of the first cross backup unit, the output ports are the first output port O17 of the first cross backup unit and the second output port O18 of the first cross backup unit, the input ports of the second set of power combining/power dividing circuits are the fourth input port O14 of the first cross backup unit and the fifth input port O15 of the first cross backup unit, and the output ports are the third output port O19 of the first cross backup unit and the fourth output port O10 of the first cross backup unit. When there is a signal input to the second input port O12 of the first cross backup unit or the third input port O13 of the first cross backup unit, the first output port O17 of the first cross backup unit and the second output port O18 of the first cross backup unit can output signals with equal amplitude and in phase at the same time, and the second input port O12 of the first cross backup unit and the third input port O13 of the first cross backup unit do not have a signal input at the same time; when there is a signal input to the fourth input port O14 of the first cross backup unit or the fifth input port O15 of the first cross backup unit, the third output port O19 of the first cross backup unit and the fourth output port O10 of the first cross backup unit can output signals with equal amplitude and in phase at the same time, and the fourth input port O14 of the first cross backup unit and the fifth input port O15 of the first cross backup unit do not have a signal input at the same time. The second cross backup unit B2 and the third cross backup unit B3 have the same structure and principle as the first cross backup unit B1.
The manner in which three receive modules are interconnected with each cross-backup unit to implement a 2-backup 1 cold backup is shown in fig. 5. And 2, backup 1 cold backup, namely two receiving modules in the three receiving modules are used as the primary backup, the other receiving module is used as the cold backup, when any one of the two primary receiving modules fails, the cold backup receiving module can replace the failed primary receiving module to work, and the design that the two receiving modules only need one receiving module for backup is realized, namely the backup 2 is called backup 1 cold backup for short. In particular, the first, second and third receiving modules A1, A2, A3 are interconnected with a first cross backup unit B1. The first signal input port P11 of the first receiving module is connected to a 50 Ω load, and no signal is input, the first signal output port P13 of the first receiving module and the second signal output port P14 of the first receiving module are respectively connected to the first input port O11 of the first cross backup unit and the second input port O12 of the first cross backup unit, the first signal output port P23 of the second receiving module and the second signal output port P24 of the second receiving module are respectively connected to the third input port O13 of the first cross backup unit and the fourth input port O14 of the first cross backup unit, the second signal input port P32 of the third receiving module is connected to a 50 Ω load, and no signal is input, the first signal output port P33 of the third receiving module and the second signal output port P34 of the third receiving module are respectively connected to the fifth input port O15 and the sixth input port O16 of the first cross backup unit B1. The connection mode of the fourth to sixth receiving modules A4 to A6 and the second cross backup unit B2, the connection mode of the seventh to ninth receiving modules A7 to A9 and the third cross backup unit B3 are the same as the connection mode of the first to third receiving modules A1 to A3 and the first cross backup unit B1.
Under the normal working state of the radar receiver, the first receiving module A1 and the third receiving module A3 work as main receiving modules. A first relay switch S1 in a power supply unit D1 is switched to a main power supply module U1, second and third relay switches S2 and S3 are switched to first and third receiving modules A1 and A3 to be powered on, and a second receiving module A2 is powered off. The input front-end single-pole double-throw switch C1 of the signal transmission link of the first receiving module A1 is switched to the second signal input port P12 of the first receiving module, and the output rear-end single-pole double-throw switch C1 is switched to the second signal output port P14 of the first receiving module, so that the first radio-frequency main signal input by the front-end system enters the first receiving module A1 from the second signal input port P12 of the first receiving module, and is converted into an intermediate-frequency signal through amplification, filtering, frequency conversion and the like of the signal transmission link of the first receiving module A1, and the intermediate-frequency signal is output to the second input port O12 of the first cross backup unit from the second signal output port P14 of the first receiving module. The intermediate frequency signal enters the power on/power off circuit through the second input port O12 of the first cross backup unit, and finally two paths of intermediate frequency signals with equal amplitude and in phase are output at the first output port O17 of the first cross backup unit and the second output port O18 of the first cross backup unit, and are transmitted to the signal processing unit at the subsequent stage. In the same manner, the single-pole double-throw switch C1 at the front end of the input of the signal transmission link of the third receiving module A3 is switched to the first signal input port P31 of the third receiving module, the single-pole double-throw switch C1 at the rear end is switched to the first signal output port P33 of the third receiving module, the second radio frequency main signal input by the front-stage system enters the third receiving module A3 through the first signal input port P31 of the third receiving module, the second radio frequency main signal is processed into an intermediate frequency signal and then output to the fifth input port O15 of the first cross backup unit through the first signal output port P33 of the third receiving module, and finally, two equal-amplitude and in-phase intermediate frequency signals are output at the third output port O19 of the first cross backup unit and the fourth output port O10 of the first cross backup unit.
When the first receiving module A1 fails and cannot work normally, the first relay switch S1 in the power supply unit D1 is still switched to the main power supply module U1, the second and third relay switches S2 and S3 are switched to the second and third receiving modules A2 and A3 to be powered on, and the first receiving module A1 is powered off. The operating state of the third receiving module A3 is unchanged. The single-pole double-throw switch C1 at the front end of the link of the second receiving module A2 is switched to the first signal input port P21 of the second receiving module, and the single-pole double-throw switch C1 at the rear end is switched to the first signal output port P23 of the second receiving module, so that the first rf standby signal input by the front-end system enters the second receiving module A2 from the first signal input port P21 of the second receiving module, and is converted into an intermediate frequency signal through amplification, filtering, frequency conversion and the like of the signal transmission link of the second receiving module A2, and the intermediate frequency signal is output to the third input port O13 of the first cross backup unit from the first signal output port P23 of the second receiving module. The intermediate frequency signal enters the power on/power off circuit through the third input port O13 of the first cross backup unit, and finally two paths of intermediate frequency signals with equal amplitude and in phase are output at the first output port O17 of the first cross backup unit and the second output port O18 of the first cross backup unit, and are transmitted to the signal processing unit at the subsequent stage. According to the method, the second receiving module A2 as a backup implements the function of the first receiving module A1 as a master in place of the failure.
Similarly, when the third receiving module A3 fails and cannot work normally, the first relay switch S1 in the power supply unit D1 is still switched to the main power supply module U1, the second and third relay switches S2 and S3 are switched to the first and second receiving modules A1 and A2 to be powered on, and the third receiving module A3 is powered off. The operating state of the first receiving module A1 is unchanged. The input front-end single-pole double-throw switch C1 of the signal transmission link of the second receiving module A2 is switched to the second signal input port P22 of the second receiving module, and the output rear-end single-pole double-throw switch C1 is switched to the second signal output port P24 of the second receiving module, so that the second rf standby signal input by the front-end system enters the second receiving module A2 from the second signal input port P22 of the second receiving module, and is converted into an intermediate frequency signal through amplification, filtering, frequency conversion and the like of the signal transmission link of the second receiving module A2, and the intermediate frequency signal is output to the fourth input port O14 of the first cross backup unit from the second signal output port P24 of the second receiving module. The intermediate frequency signal enters the power on/power off circuit through the fourth input port O14 of the first cross backup unit, and finally two paths of intermediate frequency signals with equal amplitude and in phase are output at the third output port O19 of the first cross backup unit and the fourth output port O10 of the first cross backup unit, and are transmitted to the signal processing unit at the subsequent stage. According to the method, the second receiving module A2 as a backup implements the function of the third receiving module A3 as a master in place of the failure.
According to the method, when the first receiving module A1 or the third receiving module A3 has a fault, the second receiving module A2 can work instead of the first receiving module A1, and the four output ports of the first cross backup unit B1 can output signals, so that the design of 2-standby 1 cold backup is realized. The fourth receiving modules A4 to A6 and the second cross backup unit B2, the seventh receiving modules A7 to A9 and the ninth receiving module B3 can also realize 2-to-1 cold backup design in the same way. According to the backup method, the radar receiver which needs to receive six paths of signals only needs to be provided with three backup receiving modules to form a nine-channel radar receiver. The advantage of the design method for the receiver with more receiving channels is more obvious.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A multi-channel cold backup method applied to a synthetic aperture radar system is characterized in that three same receiving modules are in a group and are interconnected with a cross backup unit, any two of the three same receiving modules are powered on through a power supply unit, and the switching of signal input ports is completed by controlling switches in the receiving modules, so that the three receiving modules are provided with 2 backup 1 cold backups, wherein the 2 backup 1 cold backups are that two receiving modules in the three receiving modules are used as a master, one receiving module is used as a cold backup, and when any one of the two receiving modules used as the master fails, the receiving module used as the cold backup can replace the receiving module which fails and is used as the master to work, so that only one receiving module is needed for backup of the two receiving modules;
the cross backup unit comprises a first input port, a second input port, a third input port, a fourth input port, a fifth input port, a sixth input port, a first output port, a second output port, a third output port and a fourth output port; the first input port and the sixth input port are connected with a 50 omega load; two power combining/power dividing circuits are arranged in the cross backup unit, input ports of the first power combining/power dividing circuit are a second input port and a third input port, output ports of the first power combining/power dividing circuit are a first output port and a second output port, input ports of the second power combining/power dividing circuit are a fourth input port and a fifth input port, and output ports of the second power combining/power dividing circuit are a third output port and a fourth output port; when one path of signal input is arranged at the second input port or the third input port, the first output port and the second output port simultaneously output signals with equal amplitude and same phase, and when the second input port and the third input port do not have the same signal input, the signals are input; when one path of signal input exists at the fourth input port or the fifth input port, the third output port and the fourth output port simultaneously output signals with equal amplitude and same phase, and the fourth input port and the fifth input port cannot simultaneously have signal input.
2. The multi-channel cold backup method applied to the synthetic aperture radar system according to claim 1, wherein the power supply unit comprises a main power supply module and a backup power supply module which are the same, and further comprises a power supply distribution network composed of a first relay switch, a second relay switch and a third relay switch; the first relay switch is switched to the main power supply module, and the second relay switch and the third relay switch are switched to the first power-on and the third power-on of three identical receiving modules in the cross backup unit; if the first or the third of the three same receiving modules fails to work, the second relay switch and the third relay switch are switched to be powered on to the second or the third of the three same receiving modules or to be powered on to the first or the second of the three same receiving modules, and the first relay switch keeps the main power supply module to work.
3. The multi-channel cold backup method for the synthetic aperture radar system as claimed in claim 1, wherein the receiving module has only one signal transmission link, including a first signal input port, a second signal input port, and a first signal output port, a second signal output port.
4. The multi-channel cold backup method applied to the synthetic aperture radar system according to claim 3, wherein a single-pole double-throw switch is provided at an input front end of the signal transmission link of each receiving module, and the link is selectively switched to the first signal input port or the second signal input port by a control signal; the single-pole double-throw switch is arranged at the output rear end of each receiving module, when the single-pole double-throw switch at the input front end of the signal transmission link is switched to the first signal input port, the single-pole double-throw switch at the output rear end of the signal transmission link is switched to the first signal output port, and when the single-pole double-throw switch at the input front end of the signal transmission link is switched to the second signal input port, the single-pole double-throw switch at the output rear end of the signal transmission link is switched to the second signal output port.
5. The multi-channel cold backup method applied to the synthetic aperture radar system according to claim 1, wherein the three identical receiving modules are interconnected with a cross backup unit; a first signal input port of a first one of the three identical receiving modules is connected with a 50 omega load and has no signal input, and a first signal output port and a second signal output port of the first one of the three identical receiving modules are respectively connected with a first input port and a second input port of the cross backup unit; the first and second signal output ports of the second of the three same receiving modules are respectively connected with the third input port and the fourth input port of the cross backup unit; the second signal input port of the third of the three identical receiving modules is connected with a 50 omega load, no signal is input, and the first signal output port and the second signal output port of the third receiving module are respectively connected with the fifth input port and the sixth input port of the cross backup unit.
6. The multi-channel cold backup method for the SAR system as claimed in claim 5, wherein there are three groups of the three same receiving modules, that is, nine receiving modules, and each group is connected to a cross backup unit.
7. A multi-channel cold backup method applied to a synthetic aperture radar system according to any of claims 2-6, characterized in that, in the normal operation of the radar receiver, the first and the third of the three identical receiving modules operate as the main receiving module; a first relay switch in the power supply unit is switched to the main power supply module, a second relay switch and a third relay switch are switched to the first power-on and the third power-on of the three same receiving modules, and the second power-off of the three same receiving modules; the single-pole double-throw switch at the input front end of the signal transmission link of the first of the three identical receiving modules is switched to the second input port of the single-pole double-throw switch, the single-pole double-throw switch at the output rear end of the signal transmission link of the first of the three identical receiving modules is switched to the second signal output port of the single-pole double-throw switch, a first radio-frequency main signal input by a preceding-stage system enters the first of the three identical receiving modules from the second signal input port of the first radio-frequency main signal, is amplified, filtered and frequency-converted by the signal transmission link of the first of the three identical receiving modules, is converted into an intermediate-frequency signal, and is output to the second input port of the cross backup unit from the second signal output port of the first radio-frequency main signal; the intermediate frequency signal enters the power on/power off circuit through a second input port of the cross backup unit, and finally two paths of intermediate frequency signals with equal amplitude and in phase are output at a first output port and a second output port of the cross backup unit and transmitted to a signal processing single machine at the later stage; the single-pole double-throw switch at the input front end of a signal transmission link of a third receiving module is switched to a first signal input port, the single-pole double-throw switch at the output rear end is switched to a first signal output port, a second radio frequency main signal input by a front-stage system enters the third receiving module through the first signal input port, is processed into an intermediate frequency signal and then is output to a fifth input port of a cross backup unit through the first signal output port, and finally two paths of intermediate frequency signals with equal amplitude and same phase are output at the third output port of the cross backup unit and a fourth output port of the cross backup unit.
8. A multi-channel cold backup method applied to a synthetic aperture radar system according to any one of claims 2-6, characterized in that when a first of three identical receiving modules fails to work normally, a first relay switch in a power supply unit is still switched to a main power supply module, a second relay switch and a third relay switch are switched to power on a second and a third of the three identical receiving modules, and the first of the three identical receiving modules is powered off; the working state of the third of the three same receiving modules is unchanged; the single-pole double-throw switch at the input front end of a signal transmission link of the second of the three same receiving modules is switched to a first signal input port of the signal transmission link, the single-pole double-throw switch at the output rear end is switched to a first signal output port of the signal transmission link, a first radio frequency standby signal input by a front-stage system enters the second of the three same receiving modules from the first signal input port of the first radio frequency standby signal, is amplified, filtered and converted into an intermediate frequency signal through the signal transmission link, and the intermediate frequency signal is output to a third input port of the cross backup unit from the first signal output port of the first radio frequency standby signal; the intermediate frequency signal enters the power on/power off circuit through a third input port of the cross backup unit, and finally two paths of intermediate frequency signals with equal amplitude and same phase are output at a first output port of the cross backup unit and a second output port of the cross backup unit and transmitted to a signal processing single machine at the later stage; at this time, the second of the three identical receiving modules replaces the first of the failed three identical receiving modules as a backup.
9. A multi-channel cold backup method for synthetic aperture radar system according to any of claims 2-6, characterized in that when the third of the three identical receiving modules fails, the first relay switch in the power supply unit is still switched to the main power supply module, the second and third relay switches are switched to the first and second of the three identical receiving modules, and the third of the three identical receiving modules is powered off; the working state of the first of the three identical receiving modules is unchanged; the single-pole double-throw switch at the input front end of the signal transmission link of the second of the three same receiving modules is switched to the second signal input port of the signal transmission link, the single-pole double-throw switch at the output rear end is switched to the second signal output port of the signal transmission link, a second radio frequency standby signal input by the front-stage system enters the second of the three same receiving modules from the second signal input port of the front-stage system, is amplified, filtered and frequency-converted by the signal transmission link, is converted into an intermediate frequency signal, and is output to the fourth input port of the cross backup unit from the second signal output port of the front-stage system; the intermediate frequency signal enters the power on/power off circuit through a fourth input port of the cross backup unit, and finally two paths of intermediate frequency signals with equal amplitude and same phase are output at a third output port of the cross backup unit and a fourth output port of the cross backup unit and transmitted to a signal processing single machine at the later stage; at this time, the second of the three identical receiving modules replaces the third of the failed three identical receiving modules as a backup.
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