Satellite-borne radar transceiving redundant system capable of halving pulse accumulation time

Abstract

The invention provides a spaceborne radar transmit-receive redundancy system capable of halving pulse accumulation time, and relates to the technical field of radar transmit-receive systems. The system comprises a frequency synthesizer main part, a frequency synthesizer backup part, a switch module, a receiving and transmitting main channel, a receiving and transmitting backup channel, a time sequence controller, a switch network module, an AD / DA conversion main part, an AD / DA conversion backup part and a power supply module. The spaceborne radar transmit-receive redundancy system can work in a general mode like a conventional redundancy system and can also work in an instantaneous frequency measurement mode, the pulse accumulation time can be halved, and time resources are saved. Besides, multiple working modes not only can meet the multifunctional application occasion of the radar, but also can meet the technical requirements of different radar systems on the bandwidth, have high reliability of a conventional method, and also have better platform universality and portability at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of radar transceiver systems, and in particular to a satellite-borne radar transceiver redundancy system capable of halving pulse accumulation time. Background Art

[0002] The satellite-borne radar transceiver system is an important part of the radar system. It amplifies, converts, filters, demodulates and digitizes the weak signals received by the radar antenna; it performs necessary processing such as up-conversion and power amplification on the signals from the digital front-end digital-to-analog conversion channel, and then radiates them into space from the antenna; conventional radar transceiver systems include frequency synthesis modules, digital-to-analog / analog-to-digital conversion modules, transceiver channels and power supplies.

[0003] Normally, the design of the satellite-borne radar transceiver system will include redundant design for key units / equipment. In order to make the redundant design flexible and effective, the conventional redundant design is as follows: Figure 1 The frequency synthesis module, transceiver channel and AD / DA channel are all redundantly backed up, and the main and backup channels can be switched through active switches.

[0004] However, during instantaneous frequency measurement, the existing transceiver system only has a single digital-to-analog / analog-to-digital conversion channel working, and the pulse accumulation time cannot be shortened, making it difficult to meet the wide-band frequency measurement requirements. That is, the existing satellite-borne radar transceiver system cannot solve the contradiction between the radar frequency measurement time and the frequency measurement band width. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the shortcomings of the prior art, the present invention provides a satellite-borne radar transceiver redundant system that can reduce the pulse accumulation time by half, thereby solving the technical problem that the existing satellite-borne radar transceiver system cannot solve the contradiction between the radar frequency measurement time and the frequency measurement band width.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] The present invention provides a satellite radar transceiver redundancy system capable of halving the pulse accumulation time, comprising: a frequency synthesis master, a frequency synthesis backup, a switch module, a transceiver master channel, a transceiver backup channel, a timing control, a switch network module, an AD / DA conversion master, an AD / DA conversion backup and a power supply module;

[0010] The switch module includes two input ports and two output ports, wherein the first input port is connected to the frequency synthesis backup, the second input port is connected to the frequency synthesis main part, the first output port is connected to the second end of the transceiver backup channel, and the second output port is connected to the second end of the transceiver main channel;

[0011] The timing control is connected to the timing control ports of the main transceiver channel and the standby transceiver channel, and is used to control the transceiver switching and transceiver timing of the main transceiver channel and the standby transceiver channel;

[0012] The fourth end of the main transceiver channel is connected to the fourth end of the standby transceiver channel and is linked to the external antenna;

[0013] The switch network module includes four ports; the first end is connected to the first end of the main transceiver channel, the second end is connected to the first end of the backup transceiver channel, the third end is connected to the main AD / DA converter, and the fourth end is connected to the backup AD / DA converter;

[0014] The power module is electrically connected to all other components of the spaceborne radar transceiver redundancy system;

[0015] The switch network module includes a plurality of functional devices and a plurality of switches for performing power division and attenuation on the signal, and controls the switch module and the plurality of switches in the switch network module to make the satellite-borne radar transceiver redundancy system operate in a general operating mode or an instantaneous frequency measurement mode;

[0016] Among them, in the general working mode, each module in the redundant transceiver system of the spaceborne radar is used as the main backup;

[0017] In the instantaneous frequency measurement mode, either the main transceiver channel or the backup transceiver channel works, the port of the switch network module connected to the working transceiver channel is simultaneously turned on with the third port and the fourth port, and the main AD / DA conversion and the backup AD / DA conversion are turned on at the same time, so that the pulse accumulation time is halved.

[0018] Preferably, the switch network module includes a first power divider, a second power divider, a first attenuator, a second attenuator, a third attenuator, a fourth attenuator, a first switch, a second switch and a third switch;

[0019] Wherein, the third end of the first power divider is the first end of the switch network module, and the third end of the second power divider is the second end of the switch network module;

[0020] The first end and the second end of the first power divider are respectively connected to one end of the first attenuator and one end of the second attenuator; the first end and the second end of the second power divider are respectively connected to one end of the third attenuator and one end of the fourth attenuator;

[0021] The power divider is characterized in that if a signal is input from the first end or the second end, the signal is output from the third end; if a signal is input from the third end, the signal is output from the first end and the second end.

[0022] The other end of the first attenuator is connected to port 2 of the second switch, the other end of the second attenuator is connected to port 2 of the first switch, the other end of the third attenuator is connected to port 3 of the first switch, and the other end of the fourth attenuator is connected to port 3 of the third switch;

[0023] Port 1 of the first switch is connected to port 3 of the second switch and port 2 of the third switch respectively;

[0024] The second switch port 1 is the third terminal of the switch network module, and the port 1 of the third switch is the fourth terminal of the switch network module.

[0025] Preferably, the operating mode of the satellite-borne radar transceiver redundancy system also includes an instantaneous bandwidth expansion mode; in the instantaneous bandwidth expansion mode, by controlling a plurality of switches in the switch module and the switch network module, as well as timing control, the main transceiver channel and the transceiver backup channel work simultaneously, and the main transceiver channel and the transceiver backup channel generate radio frequency signals in time-sharing according to the commands of the timing control to achieve time domain splicing; the first end and the third end of the switch network module are turned on, and the second end and the fourth end are turned on, thereby achieving bandwidth expansion.

[0026] Preferably, in the instantaneous bandwidth expansion mode,

[0027] The frequency of the local oscillator signal generated by the frequency synthesizer master is LO1, and the frequency of the local oscillator signal generated by the frequency synthesizer backup is LO2=LO1+2×BW; the signal frequencies generated by the AD / DA master and backup are both F1±BW;

[0028] The frequency of the RF signal output by the main transceiver channel is (F1+LO1)±BW, and the frequency of the RF signal output by the backup transceiver channel is (F1+LO1+2×BW)±BW. The frequency of the electrical signal of the main and backup transceiver channels after synthesis in the time domain and frequency domain is (F1+LO1+BW)±2×BW, where F1 represents the intermediate frequency signal frequency of the signal generated by the DA in the AD / DA converter, and BW represents the signal bandwidth of the signal generated by the AD / DA converter DA.

[0029] Preferably, the power supply module continuously supplies power to all other components of the satellite-borne radar transceiver redundancy system, or quickly switches between the primary and backup components, with a switching time of 1 to 2 us.

[0030] Preferably, in the normal working mode or in the instantaneous frequency measurement mode,

[0031] The local oscillator signal frequencies generated by the main and backup frequency synthesizers are both LO1, and the RF signal frequencies output by the main transceiver channel and the backup transceiver channel are both (F1+LO1)±BW, where F1 represents the intermediate frequency signal frequency of the signal generated by the DA in the AD / DA converter, and BW represents the signal bandwidth of the signal generated by the AD / DA converter DA.

[0032] (III) Beneficial effects

[0033] The present invention provides a redundant transceiver system for spaceborne radars that can halve the pulse accumulation time. Compared with the prior art, the present invention has the following beneficial effects:

[0034] The satellite-borne radar transceiver redundancy system of the present invention can work in a general mode like a conventional redundancy system, or in an instantaneous frequency measurement mode, which can halve the pulse accumulation time and save time resources. In addition, the multiple working modes can not only meet the multi-functional application occasions of the radar, but also meet the technical requirements of different radar systems for bandwidth, and have both the high reliability of conventional methods and good platform versatility and portability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 The existing schematic diagram is a composition diagram of a conventional satellite-borne radar transceiver redundancy system;

[0037] Figure 2 The figure is a schematic diagram of the composition of a redundant transceiver system for a spaceborne radar capable of halving the pulse accumulation time in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The embodiments of the present application provide a redundant satellite radar transceiver system that can reduce the pulse accumulation time by half, thereby solving the technical problem that the existing satellite radar transceiver system cannot solve the contradiction between the radar frequency measurement time and the frequency measurement band width, and realizes the reasonable design of redundant topology structure and switch network module. When receiving the echo signal, the primary and backup analog-to-digital / digital-to-analog conversion can work simultaneously, saving time resources for subsequent digital processing, achieving the purpose of reducing the pulse accumulation time by half, and effectively widening the instantaneous frequency measurement band width.

[0040] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0041] The electromagnetic environment faced by modern radar systems in satellite applications is becoming increasingly complex, with wider signal bands, increased signal density, and diversified signal modulation types. Therefore, it is necessary to study a radar transceiver system that can shorten the frequency measurement pulse accumulation time, gain an advantage in electronic countermeasures, and broaden the measurable frequency band width. To achieve the above purpose, an embodiment of the present invention provides a satellite-borne radar transceiver redundant system that can halve the pulse accumulation time. By improving the redundant topology of the satellite-borne radar transceiver system and designing the switch network module, the frequency measurement search pulse accumulation time is halved, which has a huge advantage in electronic countermeasures. At the same time, the present invention can realize a variety of radar functions, have the high reliability of conventional designs, and improve the versatility and adaptability of the system.

[0042] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] Embodiment 1:

[0044] The embodiment of the present invention provides a redundant transceiver system for a spaceborne radar capable of halving the pulse accumulation time. Figure 2 As shown, it includes a frequency synthesis main copy, a frequency synthesis backup, a switch module, a main transceiver channel, a transceiver backup channel, a timing control, a switch network module, an AD / DA (analog-to-digital / digital-to-analog) conversion main copy, an AD / DA conversion backup, and a power module;

[0045] The switch module includes four ports ( Figure 2 1, 2, 3, 4) in the switch module, wherein switch port 1 is connected to the frequency synthesis backup, switch port 2 is connected to the frequency synthesis main part, the switch port 3 is connected to the transceiver backup channel port 2, and the switch port 4 is connected to the transceiver main channel port 2;

[0046] The timing control is connected to the main transceiver channel port 3 (ie, the timing control port) and the standby transceiver channel port 3 (timing control port), and is used to control the transceiver switching and the transceiver timing of the main transceiver channel and the standby transceiver channel.

[0047] The switch network module includes four ports (A1, A2, B1 and B2), wherein the first port A1 is connected to the port 1 of the main transceiver channel, the second port A2 is connected to the port 1 of the backup transceiver channel, the third port B1 is connected to the main AD / DA converter, and the fourth port B2 is connected to the backup AD / DA converter;

[0048] The power supply module is electrically connected to all other components of the spaceborne radar transceiver redundancy system, providing stable and reliable power input for all components of the spaceborne radar transceiver redundancy system;

[0049] The switch network module includes a plurality of power dividers, a plurality of attenuators and a plurality of switches. By controlling the switch module and the plurality of switches in the switch network module, the satellite radar transceiver redundancy system operates in a general working mode or an instantaneous frequency measurement mode; wherein, in the general working mode, each module in the satellite radar transceiver redundancy system is used as a primary backup, and its connection method includes:

[0050] a. The second port 2 and the fourth port 4 of the switch module are connected, A1 and B1 of the switch network module are connected, or A1 and B2 of the switch network module are connected;

[0051] b. The first port 1 and the fourth port 4 of the switch module are connected, A1 and B1 of the switch network module are connected, or A1 and B2 of the switch network module are connected;

[0052] c. The first port 1 and the third port 3 of the switch module are connected, A2 and B2 of the switch network module are connected, or A2 and B1 of the switch network module are connected;

[0053] d. The second port 2 and the third port 3 of the switch module are connected, A2 and B2 of the switch network module are connected, or A2 and B1 of the switch network module are connected;

[0054] In the instantaneous frequency measurement mode, the connection methods include:

[0055] The first port 1 and the third port 3 of the switch module are turned on, or the second port 2 and the fourth port 4 are turned on; or the first port 1 and the fourth port 4 of the channel selection switch are turned on, or the second port 2 and the third port 3 are turned on; that is, either the main transceiver channel or the backup transceiver channel is working. The input end of the switch network module connected to the transceiver channel in working state is turned on with the two output ends at the same time, and the main AD / DA conversion and the backup AD / DA conversion are turned on at the same time, so that the pulse accumulation time is halved. That is, port A1 of the switch network module is turned on with port B1 and port B2 at the same time, or port A2 is turned on with port B1 and port B2 at the same time, that is, the switch network module has one input and two outputs.

[0056] like Figure 2 As shown, the switch network module includes a power divider P1, a power divider P2, an attenuator AT1, an attenuator AT2, an attenuator AT3, an attenuator AT4, a switch S1, a switch S2, and a switch S3. Port 3 of the power divider P1 is port A1 of the switch network module, and port 3 of the power divider P2 is port A2 of the switch network module. Port 1 of the power divider P1 is connected to one end of the attenuator AT1, and port 2 of the power divider P1 is connected to one end of the attenuator AT2; port 1 of the power divider P2 is connected to one end of the attenuator AT3, and port 2 of the power divider P2 is connected to one end of the attenuator AT4. The other end of the attenuator AT1 is connected to port 2 of switch S2, the other end of the attenuator AT2 is connected to port 2 of switch S1, the other end of the attenuator AT3 is connected to port 3 of switch S1, and the other end of the attenuator AT4 is connected to port 3 of switch S3. Port 1 of switch S1 is connected to port 3 of switch S2 and port 2 of switch S3, respectively. Port 1 of switch S2 is port B1 of the switch network module, and port 1 of switch S3 is port B2 of the switch network module.

[0057] In the specific implementation process, the satellite radar transceiver redundancy system can also operate in the instantaneous bandwidth expansion mode. In this working mode, the main and backup channels work simultaneously, that is, the first port 1 and the third port 3 of the switch module are turned on, and the second port 2 and the fourth port 4 are turned on; or the first port 1 and the fourth port 4 of the channel selection switch are turned on, and the second port 2 and the third port 3 are turned on; the main transceiver channel and the transceiver backup channel generate radio frequency signals in time-sharing according to the timing control command to realize time domain splicing; A1 and B1 of the switch network module are turned on, and A2 and B2 are turned on.

[0058] In the specific implementation process, the power module continuously supplies power to all other components of the redundant transceiver system of the onboard radar. At the same time, the power module can quickly switch between the main and backup systems, with a switching time of 1 to 2 us. This fast switching does not affect the system task, and can achieve fast switching of the main and backup systems during the task execution; it improves the system reliability, and can quickly switch to another path if any of the main and backup paths fails.

[0059] In general working mode, the frequency synthesis master and backup are only used as general master and backup, and the LO signal frequency generated by the master and backup is LO1. The main transceiver channel and the transceiver backup channel are only used as general master and backup, and the output RF signal frequency is (F1+LO1)±BW. The power-off channel is in a 50Ω impedance state. F1 represents the intermediate frequency signal frequency of the signal generated by the DA in the AD / DA converter, and BW represents the signal bandwidth of the signal generated by the DA in the AD / DA converter.

[0060] In the instantaneous bandwidth extension mode, the frequency of the local oscillator signal generated by the main frequency synthesizer is LO1, and the frequency of the local oscillator signal generated by the backup frequency synthesizer is LO2 = LO1 + 2 × BW. The main and backup transceiver channels generate RF signals in time-sharing according to the command of the timing control C to achieve time domain splicing. The frequency of the RF signal output by the main transceiver channel is (F1 + LO1) ± BW, and the frequency of the RF signal output by the backup transceiver channel is (F1 + LO1 + 2 × BW) ± BW. Finally, the frequency of the electrical signal after the main and backup transceiver channels are synthesized in the time domain and frequency domain is (F1 + LO1 + BW) ± 2 × BW. It can be seen that the final output signal has achieved a double bandwidth expansion compared to the general working mode.

[0061] In the instantaneous frequency measurement mode, through the switching of the switch module and the switch network module, the main transceiver channel, the standby transceiver channel, the main frequency synthesis copy, and the frequency synthesis copy are only used as general main and backup, that is, any one of the main transceiver channel and the standby transceiver channel works. The main analog-to-digital / digital-to-analog conversion copy works simultaneously under the gating of the switch network module. Therefore, in the subsequent digital processing, the two signals each perform the calculation of half the frequency band width of the received echo signal, which can effectively halve the instantaneous frequency measurement pulse accumulation time.

[0062] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0063] The satellite-borne radar transceiver redundancy system of the embodiment of the present invention can work in a general mode like a conventional redundancy system, or in a bandwidth extension mode, so that wide-band and narrow-band RF signal output can be realized in the same system. It can also work in an instantaneous frequency measurement mode, and the pulse accumulation time can be halved, saving time resources. In addition, multiple working modes can not only meet the multi-functional application occasions of radar, but also meet the technical requirements of different radar systems for bandwidth, combining the high reliability of conventional methods with good platform versatility and portability.

[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A redundant transceiver system for a spaceborne radar capable of halving the pulse accumulation time, characterized in that: include: Frequency synthesis main copy, frequency synthesis backup, switch module, main transceiver channel, transceiver backup channel, timing control, switch network module, AD / DA conversion main copy, AD / DA conversion backup and power supply module; The switch module includes two input ports and two output ports, wherein the first input port is connected to the frequency synthesis backup, the second input port is connected to the frequency synthesis main part, the first output port is connected to the second end of the transceiver backup channel, and the second output port is connected to the second end of the transceiver main channel; The timing control is connected to the timing control ports of the main transceiver channel and the standby transceiver channel, and is used to control the transceiver switching and transceiver timing of the main transceiver channel and the standby transceiver channel; The fourth end of the main transceiver channel is connected to the fourth end of the standby transceiver channel and is linked to the external antenna; The switch network module includes four ports; the first end is connected to the first end of the main transceiver channel, the second end is connected to the first end of the backup transceiver channel, the third end is connected to the main AD / DA converter, and the fourth end is connected to the backup AD / DA converter; The power module is electrically connected to all other components of the spaceborne radar transceiver redundancy system; The switch network module includes a plurality of functional devices and a plurality of switches for performing power division and attenuation on the signal, and controls the switch module and the plurality of switches in the switch network module to make the satellite-borne radar transceiver redundancy system operate in a general operating mode or an instantaneous frequency measurement mode; Among them, in the general working mode, each module in the redundant transceiver system of the spaceborne radar is used as the main backup; In the instantaneous frequency measurement mode, either the main transceiver channel or the backup transceiver channel works, the port of the switch network module connected to the working transceiver channel is simultaneously turned on with the third port and the fourth port, and the main AD / DA conversion and the backup AD / DA conversion are turned on at the same time, so that the pulse accumulation time is halved.

2. The satellite-borne radar transceiver redundancy system capable of halving the pulse accumulation time as claimed in claim 1, characterized in that: The switch network module includes a first power divider, a second power divider, a first attenuator, a second attenuator, a third attenuator, a fourth attenuator, a first switch, a second switch and a third switch; Wherein, the third end of the first power divider is the first end of the switch network module, and the third end of the second power divider is the second end of the switch network module; The first end and the second end of the first power divider are respectively connected to one end of the first attenuator and one end of the second attenuator; the first end and the second end of the second power divider are respectively connected to one end of the third attenuator and one end of the fourth attenuator; The power divider is characterized in that if a signal is input from the first end or the second end, the signal is output from the third end; if a signal is input from the third end, the signal is output from the first end and the second end. The other end of the first attenuator is connected to port 2 of the second switch, the other end of the second attenuator is connected to port 2 of the first switch, the other end of the third attenuator is connected to port 3 of the first switch, and the other end of the fourth attenuator is connected to port 3 of the third switch; Port 1 of the first switch is connected to port 3 of the second switch and port 2 of the third switch respectively; The second switch port 1 is the third terminal of the switch network module, and the port 1 of the third switch is the fourth terminal of the switch network module.

3. The satellite-borne radar transceiver redundancy system capable of halving the pulse accumulation time as claimed in claim 1, characterized in that: The working mode of the satellite-borne radar transceiver redundancy system also includes an instantaneous bandwidth expansion mode; in the instantaneous bandwidth expansion mode, by controlling a plurality of switches in a switch module and a switch network module, and timing control, the main transceiver channel and the standby transceiver channel work simultaneously, and the main transceiver channel and the standby transceiver channel generate radio frequency signals in time-sharing according to the command of the timing control to realize time domain splicing; the first end and the third end of the switch network module are connected, and the second end and the fourth end are connected, so as to realize bandwidth expansion.

4. The satellite-borne radar transceiver redundancy system capable of halving the pulse accumulation time as claimed in claim 3, characterized in that: In the instantaneous bandwidth extension mode, The frequency of the local oscillator signal generated by the frequency synthesizer master is LO1, and the frequency of the local oscillator signal generated by the frequency synthesizer backup is LO2=LO1+2×BW; the signal frequencies generated by the AD / DA master and backup are both F1±BW; The frequency of the RF signal output by the main transceiver channel is (F1+LO1)±BW, and the frequency of the RF signal output by the backup transceiver channel is (F1+LO1+2×BW)±BW. The frequency of the electrical signal of the main and backup transceiver channels after synthesis in the time domain and frequency domain is (F1+LO1+BW)±2×BW, where F1 represents the intermediate frequency signal frequency of the signal generated by the DA in the AD / DA converter, and BW represents the signal bandwidth of the signal generated by the AD / DA converter DA.

5. The satellite-borne radar transceiver redundancy system capable of halving the pulse accumulation time as claimed in any one of claims 1 to 4, characterized in that: The power supply module continuously supplies power to all other components of the satellite-borne radar transceiver redundancy system, or quickly switches between the primary and backup systems, with a switching time of 1 to 2 us.

6. The redundant satellite radar transceiver system capable of halving the pulse accumulation time as claimed in any one of claims 1 to 4, characterized in that: In normal working mode or instantaneous frequency measurement mode, The local oscillator signal frequencies generated by the main and backup frequency synthesizers are both LO1, and the RF signal frequencies output by the main transceiver channel and the backup transceiver channel are both (F1+LO1)±BW, where F1 represents the intermediate frequency signal frequency of the signal generated by the DA in the AD / DA converter, and BW represents the signal bandwidth of the signal generated by the AD / DA converter DA.

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