CN114826294B - Modularized large dynamic high-speed channel conversion device and method - Google Patents
Modularized large dynamic high-speed channel conversion device and method Download PDFInfo
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Abstract
The invention discloses a modularized large dynamic high-speed channel conversion device and a modularized large dynamic high-speed channel conversion method, wherein the device comprises modules 1-3; in the module 1, a microwave signal is input into a double-channel subnetwork formed by two single-knife two-switch devices to form two working modes of a low-noise channel and a straight-channel, a lower-level link is a six-channel preselection switch filter bank, a channel signal which is preselected and output is subjected to low-noise amplification and then mixed with a first local oscillator to obtain a first intermediate frequency, and then is subjected to single-knife two-switch filter bank to obtain two intermediate frequency signals, and then mixed with a second local oscillator to obtain a second intermediate frequency; in the module 2, the second intermediate frequency and the third local oscillator are mixed to obtain a third intermediate frequency, and finally the third intermediate frequency is divided into two paths of signal outputs with the same amplitude and phase; the module 1 is an independent sealing unit, the module 2 is mounted on the track plug box by adopting an electric mounting process, and the module 3 is an independent control board unit and is used for controlling and supplying power between the modules. The invention has the advantages of large measurement dynamic range, low noise coefficient, high mode channel switching speed, high integration level and strong universality.
Description
Technical Field
The invention relates to the technical field of electronic reconnaissance and electronic reactance, in particular to a modularized large dynamic high-speed channel conversion device and method.
Background
Various channel conversion schemes in electronic reconnaissance and electronic countermeasure system broadband receivers have been relatively mature, and the main functions of the channel conversion products are: 1) As a reconnaissance frequency-measuring receiving part, the received microwave signals are subjected to mode and channelized preselection; 2) As a frequency conversion unit, the channelized pre-selected microwave signal is converted into an intermediate frequency signal required by the signal processor. The main indicators describing the properties of this product are: 1) A noise figure; 2) Gain; 3) In-band flatness; 4) Inputting a second-order intercept point; 5) Inputting a third-order intercept point; 6) Intermediate frequency suppression; 7) Image frequency suppression; 8) An instantaneous dynamic range; 9) Measuring a dynamic range; 10 A) the mode channel switching time.
However, the conventional channel conversion scheme is usually designed in a separated mode, and has the problems of complex radio frequency and control interconnection relationship between components, low reliability, small measurement dynamic range, high noise coefficient, low mode channel switching speed, poor image rejection capability, low integration level and the like.
Disclosure of Invention
The invention aims to provide a modularized generalized microwave channel conversion device and method with the advantages of large measurement dynamic range, low noise coefficient, high mode channel switching speed, good image rejection capability, high integration level, standard size and the like.
The technical scheme for realizing the aim of the invention is as follows: the utility model provides a large dynamic high-speed channel conversion device of modularization, includes module 1, module 2, module 3, wherein:
the module 1 comprises a low-noise amplification/direct-pass dual-mode switching front-end circuit module, a preselect switch filter group circuit module, a two-stage frequency conversion circuit module and a local oscillator Lo3 circuit module which are sequentially arranged step by step; the low-noise amplification/direct-connection dual-mode switching front-end circuit module comprises a dual-channel subnetwork consisting of two single-pole two-switch, wherein the dual-channel subnetwork forms two working modes of a low-noise link and a direct-connection link, and the low-noise link consists of two continuous stages of low-noise amplification and a temperature compensation attenuator; the pre-selection switch filter group circuit module adopts a single-pole four-switch and single-pole three-switch combined dividing mode, a two-way channel of a high frequency band adopts single-pole four-way, a four-five-six channel of a low frequency band adopts a cascade single-pole three-channel, and a low-pass filter is utilized to filter high-order clutter; the two-stage frequency conversion circuit module comprises a first mixer, a single-pole two-switch filter bank and a second mixer which are sequentially arranged, wherein the first mixer receives a channel signal which is pre-selected and output and is subjected to low-noise amplification treatment, and then carries out first frequency conversion with a local oscillator Lo1 to output an intermediate frequency signal IF1; the intermediate frequency signal IF1 passes through a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF12; the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are input into a second mixer and are subjected to second frequency conversion with a local oscillator Lo2 to obtain an intermediate frequency signal IF2;
The module 2 comprises a primary frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a numerical control attenuation circuit module, a two-way switch filter bank, a differential amplifier and a final power divider; the primary frequency conversion circuit module comprises a third mixer, the intermediate frequency signal IF2 is subjected to low-pass filtering, numerical control attenuation and power amplification, then a point frequency signal is output through a band-pass filter, and the point frequency signal and the local oscillator Lo3 output by the local oscillator Lo3 circuit module are subjected to third frequency conversion through the third mixer to obtain an intermediate frequency signal IF3; the intermediate frequency amplifying and filtering circuit module comprises a two-stage low-pass filter, a two-stage amplifier and an IF3 band-pass filter with the bandwidth of 20 MHz; the numerical control attenuation circuit module comprises a two-stage numerical control attenuator; the two-way switch filter group adopts a single-pole two-switch group to generate two-way signals, one is straight-through, and the other is a filtering signal with the bandwidth of 200 KHz; the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signal outputs with equal amplitude and same phase;
The module 3 is an independent control board unit and is used for controlling and supplying power between the module 1 and the module 2, the module 3 is integrated with a differential single-ended high-speed communication conversion circuit, and the module 3 is connected with the CPCIe board card in a crimping mode.
The modularized large dynamic high-speed channel conversion method is based on the modularized large dynamic high-speed channel conversion device and comprises the following specific steps:
the microwave signal received from the detection antenna is input into a double-channel subnetwork consisting of two single-pole two-switch to form two working modes of a low-noise channel and a straight channel, wherein the low-noise channel consists of two continuous low-noise amplifiers and a temperature compensation attenuator;
the lower link of the double-channel subnetwork is provided with a six-channel pre-selection switch filter group, and the order of the first, second and third channel link devices of the high frequency band is as follows: single-pole four-switch input, cavity filter, single-pole single-switch, single-pole four-switch output; the four, five and six channel link devices of the low frequency band are in sequence: single-pole four-switch input, single-pole three-switch, cavity filter, single-pole three-switch, low-pass filter, single-pole four-switch output;
the channel signal of preselection output is amplified by low noise and then is subjected to primary frequency conversion with a sweep frequency source local oscillator Lo1 to output an intermediate frequency signal IF1, and the intermediate frequency signal IF1 is subjected to a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF12; the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are respectively subjected to secondary frequency conversion with the sweep frequency local oscillator Lo2 to obtain an intermediate frequency signal IF2;
After the intermediate frequency signal IF2 is subjected to low-pass filtering, numerical control attenuation and power amplification, outputting a point frequency signal through a band-pass filter, and performing third frequency conversion on the point frequency signal and the local oscillator Lo3 output by the local oscillator Lo3 circuit module through a third mixer to obtain an intermediate frequency signal IF3;
the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signal outputs with equal amplitude and same phase.
Compared with the prior art, the invention has the remarkable advantages that:
1) The invention adopts a standard track plug-in type modular design, the whole device can be divided into 3 modules, and signal transmission between the module 1 and the module 2 is only interconnected by adopting a horizontal transition insulator pin; the module 3 is an independent control board unit and is integrated with a differential single-end high-speed communication conversion circuit; the control and power supply between the module 3 and the modules 1 and 2 are only interconnected by adopting J30JM1-31ZKSY-Q6 connectors, all signal I/O and control interfaces are distributed on one side of the plug box, and the plug interfaces are externally adopted by adopting CPCIe board cards, so that the modular integration is easy;
2) The module 1 adopts a micro-assembly process and is sealed into a high-reliability independent component by laser seal welding; the module integrates a low-noise amplification/direct-pass dual-mode switching front-end circuit module, a pre-selection switch filter group circuit module and a two-stage frequency conversion circuit module. The dual-mode change-over switch and the channel change-over switch adopt gallium arsenide MMIC electronic switches within 80ns level, so that the high-speed performance of the device is ensured;
3) The module 2 adopts an electric installation process, and integrates a primary frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a numerical control attenuation circuit module and other functional circuit modules; the small stepping numerical control attenuator can provide a gain leveling function for each channel in the module 1, and the two-stage large stepping numerical control attenuator is combined with dual-mode switching in the module 1, so that a measurement dynamic range adjusting function can be provided, and the large dynamic performance of the device is ensured;
4) The F1-F2 ultra-wideband microwave signals received by the antenna can be converted into intermediate frequency signals with the central frequency of IF through multiple frequency conversion, and the method has the advantages of large measurement dynamic range, low noise coefficient, good image rejection capability and high mode channel switching speed, and can be widely used for microwave components in electronic system equipment such as electronic reconnaissance and electronic countermeasure.
Drawings
Fig. 1 is a basic block diagram of a device circuit.
Fig. 2 is a schematic block diagram of the circuit design of the module 1.
Fig. 3 is a schematic block diagram of the circuit design of the module 2.
Fig. 4 is a circuit layout diagram of the modules 1, 2, 3.
Detailed Description
The invention discloses a modularized large dynamic high-speed channel conversion device, which comprises a module 1, a module 2 and a module 3, wherein:
the module 1 comprises a low-noise amplification/direct-pass dual-mode switching front-end circuit module, a preselect switch filter group circuit module, a two-stage frequency conversion circuit module and a local oscillator Lo3 circuit module which are sequentially arranged step by step; the low-noise amplification/direct-connection dual-mode switching front-end circuit module comprises a dual-channel subnetwork consisting of two single-pole two-switch, wherein the dual-channel subnetwork forms two working modes of a low-noise link and a direct-connection link, and the low-noise link consists of two continuous stages of low-noise amplification and a temperature compensation attenuator; the pre-selection switch filter group circuit module adopts a single-pole four-switch and single-pole three-switch combined dividing mode, a two-way channel of a high frequency band adopts single-pole four-way, a four-five-six channel of a low frequency band adopts a cascade single-pole three-channel, and a low-pass filter is utilized to filter high-order clutter; the two-stage frequency conversion circuit module comprises a first mixer, a single-pole two-switch filter bank and a second mixer which are sequentially arranged, wherein the first mixer receives a channel signal which is pre-selected and output and is subjected to low-noise amplification treatment, and then carries out first frequency conversion with a local oscillator Lo1 to output an intermediate frequency signal IF1; the intermediate frequency signal IF1 passes through a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF12; the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are input into a second mixer and are subjected to second frequency conversion with a local oscillator Lo2 to obtain an intermediate frequency signal IF2;
The module 2 comprises a primary frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a numerical control attenuation circuit module, a two-way switch filter bank, a differential amplifier and a final power divider; the primary frequency conversion circuit module comprises a third mixer, the intermediate frequency signal IF2 is subjected to low-pass filtering, numerical control attenuation and power amplification, then a point frequency signal is output through a band-pass filter, and the point frequency signal and the local oscillator Lo3 output by the local oscillator Lo3 circuit module are subjected to third frequency conversion through the third mixer to obtain an intermediate frequency signal IF3; the intermediate frequency amplifying and filtering circuit module comprises a two-stage low-pass filter, a two-stage amplifier and an IF3 band-pass filter with the bandwidth of 20 MHz; the numerical control attenuation circuit module comprises a two-stage numerical control attenuator; the two-way switch filter group adopts a single-pole two-switch group to generate two-way signals, one is straight-through, and the other is a filtering signal with the bandwidth of 200 KHz; the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signal outputs with equal amplitude and same phase;
The module 3 is an independent control board unit and is used for controlling and supplying power between the module 1 and the module 2, the module 3 is integrated with a differential single-ended high-speed communication conversion circuit, and the module 3 is connected with the CPCIe board card in a crimping mode.
As a specific example, the module 1 is an independent sealing unit, the assembly is realized by adopting a micro-assembly process, and the airtight waterproof sealing is realized by the laser seal welding cover plate; the module 2 is assembled by adopting a Rogowski 4350 board substrate and an electric mounting process, is directly arranged in a track insertion box, and is subjected to three-proofing treatment by using three-proofing paint; the control and power supply between the module 3 and the modules 1 and 2 are interconnected by adopting J30JM1-31ZKSY-Q6 connectors, the local oscillation transition between the modules 1 and 2 is interconnected by adopting SMA cables, and the terminal signal output is interconnected by adopting insulator pin bridging.
As a specific example, the low noise amplification/direct-pass dual-mode switching front-end circuit module includes a first single-pole two-switch, a first amplifier, a second amplifier, a first temperature compensation attenuator, and a second single-pole two-switch, one output of the first single-pole two-switch is sequentially connected with one input end of the first amplifier, the second amplifier, and the first temperature compensation attenuator, and the other output of the first single-pole two-switch is connected with the other input end of the second single-pole two-switch in a direct-pass manner.
As a specific example, the preselection switch filter group circuit module includes a first single-pole four-switch, a second single-pole four-switch, and a six-channel preselection switch filter group arranged between the first single-pole four-switch and the second single-pole four-switch;
the connection sequence of the first, second and third channel link devices of the high frequency band is as follows: the first output end of the first single-pole four-switch is sequentially connected with the first filter and the first input end of the second single-pole four-switch after the first single-pole four-switch is connected with the first filter; the second output end of the first single-pole four-switch is sequentially connected with the second filter and the second single-pole four-switch and then connected with the second input end of the second single-pole four-switch; the third output end of the first single-pole four-switch is sequentially connected with a third filter and a third input end of the second single-pole four-switch after the third single-pole four-switch is connected with the third filter;
the connection sequence of the fourth, fifth and sixth channel link devices of the low frequency band is as follows: the fourth output end of the first single-blade four-switch is connected with the first single-blade three-switch, the first output end of the first single-blade three-switch is connected with the first input end of the second single-blade three-switch through a fourth filter, the second output end of the first single-blade three-switch is connected with the second input end of the second single-blade three-switch through a fifth filter, the third output end of the first single-blade three-switch is connected with the third input end of the second single-blade three-switch through a sixth filter, and the output end of the second single-blade three-switch is connected with the fourth input end of the second single-blade four-switch through a seventh filter;
The output end of the second single-pole four-switch is connected with the two-stage frequency conversion circuit module.
As a specific example, the two-stage frequency conversion circuit module includes a first mixer, a single-pole two-switch filter bank, and a second mixer which are sequentially arranged; the output signal of the preselection switch filter bank circuit module is sequentially connected with the third amplifier and the first equalizer and then is connected with one input end of the first mixer, the local oscillator Lo1 is sequentially connected with the fourth amplifier and the first attenuator and then is connected with the other input end of the first mixer, and the output end of the first mixer outputs an intermediate frequency signal IF1;
the single-blade two-switch filter group comprises a third single-blade two-switch and a fourth single-blade two-switch, wherein the input end of the third single-blade two-switch is connected with the output end of the first mixer, the first output end of the third single-blade two-switch is sequentially connected with the first input end of the fourth single-blade two-switch, the eighth filter and the sixth single-blade two-switch, and then is connected with the second input end of the fourth single-blade two-switch, and the second output end of the third single-blade two-switch is sequentially connected with the fifth single-blade two-switch, the ninth filter and the seventh single-blade two-switch; the output end of the fourth single-pole two-switch is connected with one input end of the second mixer; the local oscillator Lo2 is sequentially connected with the fifth amplifier and the second attenuator, and then is connected with the other input end of the second mixer, and the output end of the second mixer outputs an intermediate frequency signal IF2.
As a specific example, the local oscillator Lo3 circuit module includes a seventh amplifier, a twelfth filter, and a third attenuator, which are sequentially connected, where the local oscillator Lo3 is input to the seventh amplifier, and an output end of the third attenuator is connected to an input end of the third mixer.
As a specific example, the module 2 includes a primary frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a digital control attenuation circuit module, a two-way switch filter bank, a differential amplifier, and a final power divider, and specifically includes:
the output end of the second mixer is sequentially connected with a tenth filter, a first numerical control attenuator, a sixth amplifier and an eleventh filter and then connected with the other input end of the third mixer; the output end of the third mixer is sequentially connected with the thirteenth filter, the eighth amplifier, the fourth attenuator, the second digital control attenuator, the ninth amplifier, the fourteenth filter, the second temperature compensation attenuator, the third digital control attenuator, the fifteenth filter and the third temperature compensation attenuator and is connected with the input end of the fifth single-pole two-switch; one output end of the fifth single-pole two-switch is connected with one input end of the sixth single-pole two-switch through a crystal filter, the other output end of the fifth single-pole two-switch is connected with the other input end of the sixth single-pole two-switch through a fifth attenuator, the output end of the sixth single-pole two-switch is sequentially connected with a first balun, a differential amplifier and a second balun and then connected with a two-way power divider, and the two-way power divider outputs two paths of signals RFout1 and RFout2 with equal amplitude and same phase.
As a specific example, MA4SW410B is adopted as the first single-pole four-way switch, MASK-003102-13590 is adopted as the first single-pole three-way switch, and MA4AGSW1 is selected as the first single-pole three-way switch; the first filter to the sixth filter are 6-channel division filters, and the frequency band covers F1-F2 ultra-wideband working frequency bands supported by the device; the seventh filter is low-pass and is used for reducing the higher harmonics of four, five and six channels.
As a specific example, the devices in the module 2 are specifically as follows:
the tenth filter is a low-pass filter for filtering high-order clutter;
the first digital control attenuator is an HMC274QS16 large step attenuator, the step is 1dB, and the dynamic range is adjusted;
the sixth amplifier is MGA-82563 low-noise amplifier and is used for gain compensation and noise suppression;
the eleventh filter is a customized band-pass filter with the bandwidth of 20MHz and is used for filtering out the out-of-band clutter of the intermediate frequency signal IF 2;
the eighth amplifier and the ninth amplifier are TQP M9028, the fourth attenuator is used for adjusting the input power value of the ninth amplifier, the ninth amplifier is ensured to work in a linear working state, the second digital control attenuator is an HMC470LP3 large stepping attenuator, the stepping is 1dB, and the dynamic range is adjusted;
The fourteenth filter is a customized band-pass filter with the bandwidth of 20MHz and is used for filtering out-of-band clutter of the intermediate frequency signal IF 3;
the second temperature compensation attenuator and the third temperature compensation attenuator are used for balancing high-low temperature gain fluctuation of the output signal of the terminal;
the fifteenth filter adopts a low-pass filter, the fourteenth filter adopts a band-pass filter, and the fifteenth filter is used as the supplement of the far-end clutter suppression of the fourteenth filter;
the third digital control attenuator is an HMC792LP4E small stepping attenuator, the stepping is 0.25dB, and two functions are realized: firstly, the gain fine adjustment is used for the whole microwave link; secondly, according to channel frequency codes in all channels in the module 1, gain difference values among different channels are adjusted, so that the flatness of a terminal output signal is ensured to be within an index range in the whole F1-F2 ultra-wideband working frequency band;
the fifth and sixth single-pole two switches are both HMC336MS8G, the crystal filter is a customized 200KHz narrow-band filter, and the fifth attenuator is used for adjusting the insertion loss of the straight-through path and the filter path; selecting a straight path when a large signal is input, and selecting a 200KHz narrow-band filter path when a small signal is input;
the differential amplifier is LT5514, and the first balun and the second balun are application matching circuits of the differential amplifier.
The invention also provides a modularized large dynamic high-speed channel conversion method, which is based on the modularized large dynamic high-speed channel conversion device and comprises the following specific steps:
the microwave signal received from the detection antenna is input into a double-channel subnetwork consisting of two single-pole two-switch to form two working modes of a low-noise channel and a straight channel, wherein the low-noise channel consists of two continuous low-noise amplifiers and a temperature compensation attenuator;
the lower link of the double-channel subnetwork is provided with a six-channel pre-selection switch filter group, and the order of the first, second and third channel link devices of the high frequency band is as follows: single-pole four-switch input, cavity filter, single-pole single-switch, single-pole four-switch output; the four, five and six channel link devices of the low frequency band are in sequence: single-pole four-switch input, single-pole three-switch, cavity filter, single-pole three-switch, low-pass filter, single-pole four-switch output;
the channel signal of preselection output is amplified by low noise and then is subjected to primary frequency conversion with a sweep frequency source local oscillator Lo1 to output an intermediate frequency signal IF1, and the intermediate frequency signal IF1 is subjected to a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF12; the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are respectively subjected to secondary frequency conversion with the sweep frequency local oscillator Lo2 to obtain an intermediate frequency signal IF2;
After the intermediate frequency signal IF2 is subjected to low-pass filtering, numerical control attenuation and power amplification, outputting a point frequency signal through a band-pass filter, and performing third frequency conversion on the point frequency signal and the local oscillator Lo3 output by the local oscillator Lo3 circuit module through a third mixer to obtain an intermediate frequency signal IF3;
the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signal outputs with equal amplitude and same phase.
The modularized large dynamic high-speed channel conversion device has the following characteristics:
firstly, a microwave signal received from a detection antenna is input into a double-channel subnetwork formed by two single-pole two-switch to form a low-noise path and a straight-through path, wherein the low-noise path is formed by continuous two-stage low-noise amplification and a temperature compensation attenuator, and the other path is formed by 50 ohm microstrip line straight-through, so that the working mode can be switched according to the input signal power, and the measurement dynamic range can be expanded.
Secondly, dividing the detected microwave signal into six signal channels, adopting a single-blade four-switch and single-blade three-switch combined dividing mode, enabling high frequency bands with large insertion loss to be in single-blade four-through connection by first, second and third channels, enabling four, fifth and sixth channels with small insertion loss to be in cascading single-blade three channels, and filtering high-order clutter by utilizing a low-pass filter adopted by a seventh filter, so that isolation among channels is good, and insertion loss among channels is similar. The low noise amplifier and the first equalizer at the rear stage are used for assisting, so that the better flatness of signal power among channels in front of the first-stage mixer is ensured.
And after the intermediate frequency signal IF1, a switch filter group consisting of two-stage single-blade, four-stage single-blade and two-way filters is arranged, so that two-way intermediate frequency signals of an intermediate frequency signal IF11 and an intermediate frequency signal IF12 are obtained, and the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are respectively subjected to frequency conversion with a sweep frequency local oscillator Lo2, so that the intermediate frequency signal IF2 is obtained, and the actual requirements of synchronous operation and asynchronous operation of the module can be realized.
The fourth and third numerical control attenuators play the dual roles of the small stepping numerical control attenuators, not only can be used for fine adjustment of the gain of the whole device, but also can be used for fine adjustment of the gain among different channels in the module 1 according to channel frequency codes, and the attenuation devices do not need to be actually replaced, and good flatness in the whole frequency band can be ensured.
And fifthly, a two-way switch filter bank consisting of a single-pole two-switch and a crystal filter is added in the final intermediate frequency link, a straight-through way is selected when a large signal is input, a 200KHz narrow-band filter way is selected when a small signal is input, so that the noise level of the bottom can be controlled by switching the straight-through way and the filter way, the sensitivity is improved, and the dynamic measurement range is enlarged.
Sixth, the modular large dynamic high-speed channel conversion device of the invention adopts the general modular design of the track plug-in type, the modules 1, 2 and 3 are independently designed, the modules 3 and 1, 2 are controlled and powered by only adopting J30JM1-31ZKSY-Q6 connectors for interconnection, the local oscillation transition between the modules 1 and 2 is only adopting SMA cable for interconnection, the terminal signal output is only adopting insulator needle bridging interconnection, and the final general device size is only 233.5 x 158 x 18 3 。
Seventh, the following technical indexes are realized: 1) Noise coefficient is less than or equal to 8.5dB (low noise mode); 2) The in-band flatness is less than or equal to +/-2.5 dB;3) Image frequency suppression is more than or equal to 66dBc; 4) The channel mode switching time is less than or equal to 96ns; 5) Measuring dynamic range, which is more than or equal to 120dB; 6) Modularization, track cartridge size is only 233.5 x 158 x 18mm 3 。
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
Examples
Fig. 1 is a basic schematic block diagram of the device of the present invention, and the technical solution for implementing the present invention is: the universal microwave channel conversion device firstly inputs microwave signals received from a detection antenna into a double-channel subnetwork consisting of two single-pole two-switch devices to form two working modes of a low-noise channel and a straight channel, wherein the low-noise channel consists of two continuous low-noise amplifiers and a temperature compensation attenuator. The lower link is a six-channel preselection switch filter bank, and the order of the two-channel link devices of the high frequency band is as follows: single-pole four-switch input, cavity filter, single-pole single-switch, single-pole four-switch output; the four-five-six channel link devices of the low frequency band are in sequence: single-pole four-switch input, single-pole three-switch, cavity filter, single-pole three-switch, low-pass filter, single-pole four-switch output. The channel signal of preselection output is amplified by low noise and then carries out first frequency conversion with the sweep frequency source local oscillator Lo1, the first intermediate frequency IF1 is output, and the IF1 passes through a single-knife two-switch filter bank to obtain two paths of intermediate frequency signals of IF11 and IF 12. The IF11 and the IF12 respectively carry out second frequency conversion with the sweep frequency local oscillator Lo2 to obtain a second intermediate frequency IF2. After low-pass filtering, numerical control attenuation and power amplification, the IF2 is filtered by a band-pass filter to obtain a point frequency signal with the bandwidth of about 25 MHz. The IF2 and the local oscillator Lo3 are subjected to third frequency conversion to obtain an intermediate frequency signal IF3. The IF3 post-stage link devices are respectively a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, an IF3 band-pass filter with the bandwidth of 20MHz, two paths of signals (one path is straight-through, the other path is a filtering signal with the bandwidth of 200 KHz), a high-gain differential amplifier and a final-stage power divider, and finally, the intermediate-frequency signal IF3 is divided into two paths of signal outputs with the same amplitude and the same phase.
Fig. 2 is a schematic block diagram of a circuit design of the module 1, wherein a single-pole two-mode selection switch at an input end adopts MASK-002102, two-stage low-noise amplifier HMC462 is arranged immediately after the switch to ensure noise coefficients, and a subsequent temperature compensation attenuator mainly compensates for high-low temperature gain difference values of a direct-current path and a low-noise path. The lower link is a six-channel preselection switch filter bank, MA4SW410B is adopted by the single-pole four-switch 1 and 2, MASK three-switch 1 and 2 are MASK-003102-13590, MA4AGSW1 is selected by the single-pole single-switch 1-3, and the purpose is to ensure isolation of the four-five-six-channel switch filter bank of the low frequency band. The filters 1-6 are 6-channel division filters, and are depth customized band-pass filters, and the frequency bands cover F1-F2 ultra-wideband working frequency bands supported by the device. The filter 7 is low-pass and mainly reduces the higher harmonics of the four-five-six channels. The amplifier 3 is also HMC462, which is used to compensate for the gain loss of the switching filter bank and reduce the noise floor. In order to ensure the flatness of the intermediate frequency signals of the channel signals after the first-stage mixing, an equalizer 1 is arranged behind the amplifier 3, and the equalizer 1 is used for flattening the gain of the broadband microwave signals before the mixing. After the first-stage mixing is completed, a first intermediate frequency IF1 is output, and in order to realize the actual requirements of synchronous operation and asynchronous operation of the module, the IF1 obtains intermediate frequency signals of IF11 and IF12 which achieve synchronous operation and asynchronous operation by a switch filter group consisting of single-pole two switches 3-4, single-pole single switches 4-7 and filters 8-9. The IF11 and the IF12 respectively carry out second frequency conversion with the sweep frequency local oscillator Lo2, so as to obtain a second intermediate frequency IF2. Meanwhile, an amplifying and filtering circuit of Lo3 and two paths of signals output by a terminal power divider are integrated in the module 1, the whole module 1 is assembled by a micro-assembly process, and the laser seal welding cover plate is hermetically sealed.
Fig. 3 is a schematic block diagram of a circuit design of the module 2, and the filter 10 is low-pass for filtering high-order noise. The digital control attenuator 1 is an HMC274QS16 large step attenuator, and the step is 1dB, so as to adjust the dynamic range. The amplifier 6 is a MGA-82563 low noise amplifier, used as gain compensation and noise suppression. The filter 11 is a customized band-pass filter with a bandwidth of 20MHz, and is used to filter out the out-of-band clutter of the intermediate frequency signal IF 2. The amplified and filtered IF2 is subjected to third frequency conversion by a local oscillator Lo3 at the mixer 3 to obtain an intermediate frequency signal IF3. The IF3 is filtered by a low-pass filter of the filter 13 to remove high-order clutter after frequency conversion, and then enters the amplifier 8 and the amplifier 9 to amplify power, the devices of the amplifier 8 and the amplifier 9 are TQP M9028, the attenuator 4 between the two stages of amplifiers is used for adjusting the input power value of the amplifier 9 to ensure that the amplifier 9 works in a linear working state, and the numerical control attenuator 2 between the amplifiers is a HMC470LP3 large-step attenuator, and the step is 1dB to adjust the dynamic range. The filter 14 is a customized band-pass filter with a bandwidth of 20MHz, and is used for filtering out the out-of-band clutter of the intermediate frequency signal IF3. The four-stage amplifier is arranged in the radio frequency link of the module 2, and because of the temperature characteristic of the amplifier and the larger gain fluctuation at high and low temperatures, the temperature compensation attenuator 2 and the temperature compensation attenuator 3 are arranged in the link and used for balancing the high and low temperature gain fluctuation of the output signal of the terminal. The low pass filter 15 is in addition to the rejection of clutter at the far end of the band pass filter 14. The numerical control attenuator 3 is an HMC792LP4E small stepping attenuator, the steps are 0.25dB, two steps are used for fine adjustment of the gain of the whole microwave link, and the other step is used for adjusting the gain difference between different channels according to channel frequency codes in each channel in the module 1, so that the flatness of the output signal of the IF3 terminal is ensured to be within an index range in the whole F1-F2 ultra-wideband working frequency band. In the design, the dynamic range is required to be more than 120dB, the background noise is raised and the sensitivity is reduced under the condition of small signals, so that the dynamic range is reduced. A straight-through path is selected when a large signal is input, and a 200KHz narrow-band filter path is selected when a small signal is input, so that the noise floor can be reduced through narrow-band filtering, and the sensitivity is improved. The final-stage amplifier is an LT5514 differential amplifier, balun 1 and balun 2 are matched circuits, the gain of the amplifier is 33/30dBm, the controllable gain is switched, and P1 can reach 20dBm, so that the gain and the power output of the whole link are ensured.
Fig. 4 is a circuit layout diagram of modules 1, 2 and 3, wherein the module 3 is an independent control board unit, is integrated with a differential single-ended high-speed communication conversion circuit, and is connected with a CPCIe board card in a crimping manner. The module 1 is an independent sealing unit, the module 2 is assembled by adopting a Rogowski 4350 board substrate and an electric mounting process, is directly arranged in a track insertion box, and is subjected to three-proofing treatment by using three-proofing paint. The control and power supply between the module 3 and the modules 1 and 2 are only interconnected by adopting J30JM1-31ZKSY-Q6 connectors, local oscillation transition between the modules 1 and 2 is interconnected by adopting SMA cables, and terminal signal output is interconnected by adopting insulator pin bridging.
The main technical indexes of the whole channel conversion device are as follows:
working mode: low noise and normal straight-through;
noise figure: less than or equal to 12dB (low noise mode);
gain: more than or equal to 40dB;
flatness: less than or equal to +/-3 dB;
inputting a second order intercept point: not less than 45dBm;
inputting a third-order intercept point: not less than 10dBm;
intermediate frequency suppression: more than or equal to 60dBm;
image frequency suppression: more than or equal to 60dBm;
instantaneous dynamic range: more than or equal to 50dB;
measuring dynamic range: not less than 120dB;
switching time: less than or equal to 120ns;
finally, the overall dimension of the device is only 233.5 x 158 x 18mm 3 The rail plug box type modularized design, the plug box both sides are from taking helping to pull out ware and front panel latch bar, for the accurate butt joint installation of being convenient for, still be provided with the locating pin at butt joint interface side, be particularly suitable for modularization quick assembly disassembly.
The present invention has the following significant advantages as seen from the present example:
1) The invention adopts a standard track plug-in type modular design, the whole device can be divided into 3 modules, and signal transmission between the module 1 and the module 2 is only interconnected by adopting a horizontal transition insulator pin; the module 3 is an independent control board unit and is integrated with a differential single-end high-speed communication conversion circuit; the control and power supply between the module 3 and the modules 1 and 2 are only interconnected by adopting J30JM1-31ZKSY-Q6 connectors, all signal I/O and control interfaces are distributed on one side of the plug box, and the plug interfaces are externally adopted by adopting CPCIe board cards, so that the modular integration is easy;
2) The module 1 adopts a micro-assembly process and is sealed into a high-reliability independent component by laser seal welding; the module integrates a low-noise amplification/direct-pass dual-mode switching front-end circuit module, a pre-selection switch filter group circuit module and a two-stage frequency conversion circuit module. The dual-mode change-over switch and the channel change-over switch adopt gallium arsenide MMIC electronic switches within 80ns level, so that the high-speed performance of the device is ensured;
3) The module 2 adopts an electric installation process, and integrates a primary frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a numerical control attenuation circuit module and other functional circuit modules; the small stepping numerical control attenuator can provide a gain leveling function for each channel in the module 1, and the two-stage large stepping numerical control attenuator is combined with dual-mode switching in the module 1, so that a measurement dynamic range adjusting function can be provided, and the large dynamic performance of the device is ensured;
4) The F1-F2 ultra-wideband microwave signals received by the antenna can be converted into intermediate frequency signals with the central frequency of IF through multiple frequency conversion, and the method has the advantages of large measurement dynamic range, low noise coefficient, good image rejection capability and high mode channel switching speed, and can be widely used for microwave components in electronic system equipment such as electronic reconnaissance and electronic countermeasure.
Claims (6)
1. The utility model provides a big dynamic high-speed channel conversion device of modularization which characterized in that includes module 1, module 2, module 3, wherein:
the module 1 comprises a low-noise amplification/direct-pass dual-mode switching front-end circuit module, a preselect switch filter group circuit module, a two-stage frequency conversion circuit module and a local oscillator Lo3 circuit module which are sequentially arranged step by step; the low-noise amplification/direct-connection dual-mode switching front-end circuit module comprises a dual-channel subnetwork consisting of two single-pole two-switch, wherein the dual-channel subnetwork forms two working modes of a low-noise link and a direct-connection link, and the low-noise link consists of two continuous stages of low-noise amplification and a temperature compensation attenuator; the pre-selection switch filter group circuit module adopts a single-pole four-switch and single-pole three-switch combined dividing mode, a two-way channel of a high frequency band adopts single-pole four-way, a four-five-six channel of a low frequency band adopts a cascade single-pole three-channel, and a low-pass filter is utilized to filter high-order clutter; the two-stage frequency conversion circuit module comprises a first mixer, a single-pole two-switch filter bank and a second mixer which are sequentially arranged, wherein the first mixer receives a channel signal which is pre-selected and output and is subjected to low-noise amplification treatment, and then carries out first frequency conversion with a local oscillator Lo1 to output an intermediate frequency signal IF1; the intermediate frequency signal IF1 passes through a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF12; the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are input into a second mixer and are subjected to second frequency conversion with a local oscillator Lo2 to obtain an intermediate frequency signal IF2;
The module 2 comprises a primary frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a numerical control attenuation circuit module, a two-way switch filter bank, a differential amplifier and a final power divider; the primary frequency conversion circuit module comprises a third mixer, the intermediate frequency signal IF2 is subjected to low-pass filtering, numerical control attenuation and power amplification, then a point frequency signal is output through a band-pass filter, and the point frequency signal and the local oscillator Lo3 output by the local oscillator Lo3 circuit module are subjected to third frequency conversion through the third mixer to obtain an intermediate frequency signal IF3; the intermediate frequency amplifying and filtering circuit module comprises a two-stage low-pass filter, a two-stage amplifier and an IF3 band-pass filter with the bandwidth of 20 MHz; the numerical control attenuation circuit module comprises a two-stage numerical control attenuator; the two-way switch filter group adopts a single-pole two-switch group to generate two-way signals, one is straight-through, and the other is a filtering signal with the bandwidth of 200 KHz; the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signal outputs with equal amplitude and same phase;
The module 3 is an independent control board unit and is used for controlling and supplying power between the module 1 and the module 2, the module 3 is integrated with a differential single-ended high-speed communication conversion circuit, and the module 3 is connected with the CPCIe board card in a crimping manner;
the module 1 is an independent sealing unit, the assembly is realized by adopting a micro-assembly process, and the airtight waterproof sealing is realized by the laser seal welding cover plate; the module 2 is assembled by adopting a Rogowski 4350 board substrate and an electric mounting process, is directly arranged in a track insertion box, and is subjected to three-proofing treatment by using three-proofing paint; the control and power supply between the module 3 and the modules 1 and 2 are interconnected by adopting J30JM1-31ZKSY-Q6 connectors, local oscillation transition between the modules 1 and 2 is interconnected by adopting SMA cables, and terminal signal output is interconnected by adopting insulator pin bridging;
the low-noise amplification/direct-pass dual-mode switching front-end circuit module comprises a first single-pole two-switch, a first amplifier, a second amplifier, a first temperature compensation attenuator and a second single-pole two-switch, wherein one output of the first single-pole two-switch is sequentially connected with one input end of the second single-pole two-switch, the second amplifier and the first temperature compensation attenuator, and the other output of the first single-pole two-switch is connected with the other input end of the second single-pole two-switch in a direct-pass mode;
The preselection switch filter group circuit module comprises a first single-pole four-switch, a second single-pole four-switch and a six-channel preselection switch filter group arranged between the first single-pole four-switch and the second single-pole four-switch;
the connection sequence of the first, second and third channel link devices of the high frequency band is as follows: the first output end of the first single-pole four-switch is sequentially connected with the first filter and the first input end of the second single-pole four-switch after the first single-pole four-switch is connected with the first filter; the second output end of the first single-pole four-switch is sequentially connected with the second filter and the second single-pole four-switch and then connected with the second input end of the second single-pole four-switch; the third output end of the first single-pole four-switch is sequentially connected with a third filter and a third input end of the second single-pole four-switch after the third single-pole four-switch is connected with the third filter;
the connection sequence of the fourth, fifth and sixth channel link devices of the low frequency band is as follows: the fourth output end of the first single-blade four-switch is connected with the first single-blade three-switch, the first output end of the first single-blade three-switch is connected with the first input end of the second single-blade three-switch through a fourth filter, the second output end of the first single-blade three-switch is connected with the second input end of the second single-blade three-switch through a fifth filter, the third output end of the first single-blade three-switch is connected with the third input end of the second single-blade three-switch through a sixth filter, and the output end of the second single-blade three-switch is connected with the fourth input end of the second single-blade four-switch through a seventh filter;
The output end of the second single-pole four-switch is connected with the two-stage frequency conversion circuit module;
the two-stage frequency conversion circuit module comprises a first mixer, a single-pole two-switch filter bank and a second mixer which are sequentially arranged; the output signal of the preselection switch filter bank circuit module is sequentially connected with the third amplifier and the first equalizer and then is connected with one input end of the first mixer, the local oscillator Lo1 is sequentially connected with the fourth amplifier and the first attenuator and then is connected with the other input end of the first mixer, and the output end of the first mixer outputs an intermediate frequency signal IF1;
the single-blade two-switch filter group comprises a third single-blade two-switch and a fourth single-blade two-switch, wherein the input end of the third single-blade two-switch is connected with the output end of the first mixer, the first output end of the third single-blade two-switch is sequentially connected with the first input end of the fourth single-blade two-switch, the eighth filter and the sixth single-blade two-switch, and then is connected with the second input end of the fourth single-blade two-switch, and the second output end of the third single-blade two-switch is sequentially connected with the fifth single-blade two-switch, the ninth filter and the seventh single-blade two-switch; the output end of the fourth single-pole two-switch is connected with one input end of the second mixer; the local oscillator Lo2 is sequentially connected with the fifth amplifier and the second attenuator, and then is connected with the other input end of the second mixer, and the output end of the second mixer outputs an intermediate frequency signal IF2.
2. The modular large dynamic high-speed channel conversion device according to claim 1, wherein the local oscillator Lo3 circuit module comprises a seventh amplifier, a twelfth filter and a third attenuator which are sequentially connected, the local oscillator Lo3 is input into the seventh amplifier, and an output end of the third attenuator is connected to an input end of the third mixer.
3. The modular high dynamic high speed channel conversion device according to claim 1, wherein the module 2 comprises a primary frequency conversion circuit module, an intermediate frequency amplifying and filtering circuit module, a digital control attenuation circuit module, a two-way switch filter bank, a differential amplifier and a final power divider, and the specific steps are as follows:
the output end of the second mixer is sequentially connected with a tenth filter, a first numerical control attenuator, a sixth amplifier and an eleventh filter and then connected with the other input end of the third mixer; the output end of the third mixer is sequentially connected with the thirteenth filter, the eighth amplifier, the fourth attenuator, the second digital control attenuator, the ninth amplifier, the fourteenth filter, the second temperature compensation attenuator, the third digital control attenuator, the fifteenth filter and the third temperature compensation attenuator and is connected with the input end of the fifth single-pole two-switch; one output end of the fifth single-pole two-switch is connected with one input end of the sixth single-pole two-switch through a crystal filter, the other output end of the fifth single-pole two-switch is connected with the other input end of the sixth single-pole two-switch through a fifth attenuator, the output end of the sixth single-pole two-switch is sequentially connected with a first balun, a differential amplifier and a second balun and then connected with a two-way power divider, and the two-way power divider outputs two paths of signals RFout1 and RFout2 with equal amplitude and same phase.
4. The modular large dynamic high speed channel switching device of claim 1, wherein the first to second single-pole four-switch is MA4SW410B, the first to second single-pole three-switch is MASW-003102-13590, and the first to third single-pole single-switch is MA4AGSW1; the first filter to the sixth filter are 6-channel division filters, and the frequency band covers F1-F2 ultra-wideband working frequency bands supported by the device; the seventh filter is low-pass and is used for reducing the higher harmonics of four, five and six channels.
5. A modular high dynamic high speed channel switching device according to claim 3, wherein the components in module 2 are as follows:
the tenth filter is a low-pass filter for filtering high-order clutter;
the first digital control attenuator is an HMC274QS16 large step attenuator, the step is 1dB, and the dynamic range is adjusted;
the sixth amplifier is MGA-82563 low-noise amplifier and is used for gain compensation and noise suppression;
the eleventh filter is a customized band-pass filter with the bandwidth of 20MHz and is used for filtering out the out-of-band clutter of the intermediate frequency signal IF 2;
the eighth amplifier and the ninth amplifier are TQP M9028, the fourth attenuator is used for adjusting the input power value of the ninth amplifier, the ninth amplifier is ensured to work in a linear working state, the second digital control attenuator is an HMC470LP3 large stepping attenuator, the stepping is 1dB, and the dynamic range is adjusted;
The fourteenth filter is a customized band-pass filter with the bandwidth of 20MHz and is used for filtering out-of-band clutter of the intermediate frequency signal IF 3;
the second temperature compensation attenuator and the third temperature compensation attenuator are used for balancing high-low temperature gain fluctuation of the output signal of the terminal;
the fifteenth filter adopts a low-pass filter, the fourteenth filter adopts a band-pass filter, and the fifteenth filter is used as the supplement of the far-end clutter suppression of the fourteenth filter;
the third digital control attenuator is an HMC792LP4E small stepping attenuator, the stepping is 0.25dB, and two functions are realized: firstly, the gain fine adjustment is used for the whole microwave link; secondly, according to channel frequency codes in all channels in the module 1, gain difference values among different channels are adjusted, so that the flatness of a terminal output signal is ensured to be within an index range in the whole F1-F2 ultra-wideband working frequency band;
the fifth and sixth single-pole two switches are both HMC336MS8G, the crystal filter is a customized 200KHz narrow-band filter, and the fifth attenuator is used for adjusting the insertion loss of the straight-through path and the filter path; selecting a straight path when a large signal is input, and selecting a 200KHz narrow-band filter path when a small signal is input;
the differential amplifier is LT5514, and the first balun and the second balun are application matching circuits of the differential amplifier.
6. A modular large dynamic high-speed channel conversion method, which is characterized by comprising the following specific steps based on the modular large dynamic high-speed channel conversion device according to any one of claims 1-5:
the microwave signal received from the detection antenna is input into a double-channel subnetwork consisting of two single-pole two-switch to form two working modes of a low-noise channel and a straight channel, wherein the low-noise channel consists of two continuous low-noise amplifiers and a temperature compensation attenuator;
the lower link of the double-channel subnetwork is provided with a six-channel pre-selection switch filter group, and the order of the first, second and third channel link devices of the high frequency band is as follows: single-pole four-switch input, cavity filter, single-pole single-switch, single-pole four-switch output; the four, five and six channel link devices of the low frequency band are in sequence: single-pole four-switch input, single-pole three-switch, cavity filter, single-pole three-switch, low-pass filter, single-pole four-switch output;
the channel signal of preselection output is amplified by low noise and then is subjected to primary frequency conversion with a sweep frequency source local oscillator Lo1 to output an intermediate frequency signal IF1, and the intermediate frequency signal IF1 is subjected to a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF12; the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are respectively subjected to secondary frequency conversion with the sweep frequency local oscillator Lo2 to obtain an intermediate frequency signal IF2;
After the intermediate frequency signal IF2 is subjected to low-pass filtering, numerical control attenuation and power amplification, outputting a point frequency signal through a band-pass filter, and performing third frequency conversion on the point frequency signal and the local oscillator Lo3 output by the local oscillator Lo3 circuit module through a third mixer to obtain an intermediate frequency signal IF3;
the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signal outputs with equal amplitude and same phase.
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