CN102004242A - Low-stray low-harmonic and high-dynamic signal generation method - Google Patents
Low-stray low-harmonic and high-dynamic signal generation method Download PDFInfo
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Abstract
The invention relates to a low-stray low-harmonic and high-dynamic signal generation method, which belongs to the technical field of radar target echo analogue. The device mainly comprises a numerical-control attenuator, a first mixer, a first filter, a second mixer, eight band-pass filters, eight amplifiers, eight low-pass filters, a first single-pole double-throw switch and a fixed attenuator, wherein on the 2.8 to 4.0 GHz of intermediate-frequency base band, a radio-frequency signal is subjected to frequency mixing according to the data of the numerical-control attenuator and then enters a group consisting of the eight band-pass filters, the eight amplifiers and the eight low-pass filters; after filtering, the radio-frequency signal is output; if the radio-frequency signal is above 85dB, the radio-frequency signal is directly output; and if the radio-frequency signal is below 85dB, the radio-frequency signal is output through the fixed attenuator. The combination of the high-accuracy, thin-step and large-dynamic amplitude control module and the fixed attenuator is adopted for amplitude control and a multiple frequency conversion filtering design is used to improve the low-harmonic and low-stray capability of the signal.
Description
Technical field
The invention belongs to radar target analogue technique field, particularly a kind of low spuious, low harmonic wave, big dynamic signal creating method.
Background technology
For the guinea pig echo signal, tested radar is carried out interference test simulation, thoroughly evaluating radar antijamming capability.Need target echo, the undesired signal of simulation in various distances.Simulation for target echo, international now, domesticly mainly realize by digital frequency memory technique, because the signal of digital frequency memory simulation mainly is to finish at low frequency, it is final when tested device is done experiment, the signal of digital frequency memory output need be returned to radar signal, simulation for target, the numeral frequency memory is finished time domain, simulation on the frequency domain, but for variable in distance because of target, angle changes, the changes in amplitude that fluctuation characteristic does not cause on an equal basis, must finish by big dynamic amplitude control module, the present invention mainly is based on the control function of finishing the recovery and the big dynamic amplitude variation of simulated target of radar signal.
Summary of the invention
The object of the present invention is to provide a kind of low spuious, low harmonic wave, big dynamic signal creating method.
The technical scheme that solves the object of the invention is: comprise numerical-control attenuator, isolator, first frequency mixer, first wave filter, second frequency mixer, fixedly local oscillator, continuous local oscillator, first hilted broadsword, eight throw switches, bandpass filter A, B, C, D, E, F, G, H, amplifier A, B, C, D, E, F, G, H; Low-pass filter A, B, C, D, E, F, G, H, second hilted broadsword, eight throw switches, first single-pole double-throw switch (SPDT), fixed attenuator, second single-pole double-throw switch (SPDT);
The signal of numerical-control attenuator output is connected with first frequency mixer by isolator, and fixedly local oscillator is connected with first frequency mixer, and first frequency mixer is connected with second frequency mixer by first wave filter, simultaneously, continuously local oscillator links to each other with second frequency mixer, and the output terminal of second frequency mixer links to each other with first hilted broadsword, eight throw switches, first hilted broadsword, eight throw switches respectively with bandpass filter A, B, C, D, E, F, G, H connects, bandpass filter A, B, C, D, E, F, G, H successively with corresponding amplifier A, B, C, D, E, F, G, H and low-pass filter A, B, C, D, E, F, G, H, series connection, low-pass filter A, B, C, D, E, F, G, H are connected with second hilted broadsword, eight throw switches, second hilted broadsword, eight throw switches are connected with first single-pole double-throw switch (SPDT) again, and first single-pole double-throw switch (SPDT) is leaded up to fixed attenuator and linked to each other with second single-pole double-throw switch (SPDT), and another road directly links to each other with second single-pole double-throw switch (SPDT);
The conversion of signals relation:
1. being set in the intermediate frequency base band is on the 2.8-4.0GHz, and radiofrequency signal is inputed to numerical-control attenuator, and this attenuator is limited in input signal in the amplitude of appointment, is specially the amplitude range of control of 0～90dB;
2. simultaneously, determine the frequency conversion scheme according to selection, output radio frequency band and the frequency mixer of intermediate frequency base band, promptly select local oscillator, what select in this programme is fixedly local oscillator and the continuous local oscillator of 27.7GHz of 22.3GHz;
3. the later data that will decay are input to first frequency mixer by isolator, and according to the fixedly local oscillator of the 22.3GHz that determines in the step 2, carry out the mixing first time, entering into second frequency mixer by first wave filter, carrying out the mixing second time according to the continuous local oscillator of the 27.7GHz that determines in the step 2;
4. after the mixing for the second time,,, divide and enter bandpass filter A, B according to the difference of frequency band by first hilted broadsword, eight throw switches, C, D, E, F, G, H8 frequency range carried out filtering, enters amplifier A again, B, C, D, E, F, G is after H amplifies, enter low-pass filter A, B, C, D, E, F, G, H carries out filtering once more; Wave filter A, B, C, D, E, F, G, the H frequency band specifically corresponds to 1.9GHz～2.6GHz, 2.4GHz～3.1GHz, 2.9GHz～3.6GHz, 3.4GHz～4.1GHz, 4GHz～5.1GHz, 5GHz～6.1GHz, 6GHz～7.1GHz, 6.9GHz～8.1GHz, and each frequency range has the design of overlapping, the residing band of bandpass filter position suppresses, should be about-80dB;
5. once more after the filtering, enter second hilted broadsword, eight throw switches, output signal is the radiofrequency signal of 2GHz～8GHz;
6. if this radiofrequency signal is more than 85dB, first single-pole double-throw switch (SPDT) can directly be selected radiofrequency signal is input to second single-pole double-throw switch (SPDT), output then.
7. if this radiofrequency signal is below 85dB, first single-pole double-throw switch (SPDT) can be selected by fixed attenuator radiofrequency signal to be input to second single-pole double-throw switch (SPDT), then output.
Beneficial effect of the present invention:
1. a kind of low spuious, low harmonic wave, big dynamic signal creating method are provided, solve in fields such as target simulation, signal imitation emphatically, spuious, the harmonic wave index error of signal, the little difficult problem of amplitude range of control, especially big dynamic amplitude control be the spuious index of the signal difficult problem that is difficult to guarantee down.
2. content of the present invention adopts high precision, thin stepping, big dynamic amplitude control module and fixed attenuation to carry out combined magnitude control, adopt repeatedly frequency conversion filter design to improve the harmonic wave, spuious of signal, adopt reasonable anti-interference process measure to improve the method for small-signal antijamming capability, the broadband signal frequency range that produces according to this method can cover 50MHz～40GHz scope, from the microwave region to the millimeter wave band, and according to the signal that this method produces have harmonic wave, spuious inhibition degree height, advantage such as power flatness is good, the power dynamic range is big.Harmonic wave, spuious index are better than-60dBc, the power dynamic range can from+10dBm～-120dBm.
3. can be used for carrying out pouring-in, radiant type radar electronic warfare l-G simulation test when adopting low spuious, the low harmonic wave that technical solution of the present invention produced, big dynamic signal application in target echo simulation, undesired signal simulation system, possesses the ability that the war skill performance of tested gadget, tested radar EW is assessed and identified, be used in the systems such as radar under the rugged environment, communication, also can be used for various electronic countermeasures.
Description of drawings
Fig. 1 is low spuious, low harmonic wave of the present invention, big dynamic signal creating method schematic block diagram.
Embodiment
1 pair of summary of the invention is further explained and is illustrated in conjunction with the accompanying drawings,
The technical program comprises numerical-control attenuator, isolator, first frequency mixer, first wave filter, second frequency mixer, first Hi-pass filter, second Hi-pass filter, fixedly local oscillator, local oscillator, first hilted broadsword, eight throw switches, bandpass filter A continuously, B, C, D, E, F, G, H, amplifier A, B, C, D, E, F, G, H; Low-pass filter A, B, C, D, E, F, G, H, second hilted broadsword, eight throw switches, first single-pole double-throw switch (SPDT), fixed attenuator, second single-pole double-throw switch (SPDT);
The signal of numerical-control attenuator output is connected with first frequency mixer by isolator, and fixedly local oscillator is connected with first frequency mixer by first Hi-pass filter, and first frequency mixer is connected with second frequency mixer by first wave filter, simultaneously, continuously local oscillator is by linking to each other with second frequency mixer with second Hi-pass filter, and the output terminal of second frequency mixer links to each other with first hilted broadsword, eight throw switches, first hilted broadsword, eight throw switches respectively with bandpass filter A, B, C, D, E, F, G, H connects, bandpass filter A, B, C, D, E, F, G, H successively with corresponding amplifier A, B, C, D, E, F, G, H and low-pass filter A, B, C, D, E, F, G, H, series connection, low-pass filter A, B, C, D, E, F, G, H are connected with second hilted broadsword, eight throw switches, second hilted broadsword, eight throw switches are connected with first single-pole double-throw switch (SPDT) again, and first single-pole double-throw switch (SPDT) is leaded up to fixed attenuator and linked to each other with second single-pole double-throw switch (SPDT), and another road directly links to each other with second single-pole double-throw switch (SPDT);
The conversion of signals relation:
1. being set in the intermediate frequency base band is on the 2.8-4.0GHz, radiofrequency signal is inputed to numerical-control attenuator, the numerical-control attenuator attenuation range that adopts is 90dB, the stepping of attenuator is 0.5dB, control accuracy is 0.25dB, amplitude control figure place is 8, the corresponding time of attenuator is lower than 50ns, frequency of operation is 2.5GHz～4.5GHz, insert loss less than 6dB, the input signal of this attenuator designs according to 10dBm, and this attenuator is limited in the amplitude of appointment input signal, is specially the amplitude range of control of 0～90dB;
1. simultaneously, determine the frequency conversion scheme according to selection, output radio frequency band and the frequency mixer of intermediate frequency base band, promptly select local oscillator, what select in this programme is fixedly local oscillator and the continuous local oscillator of 27.7GHz of 22.3GHz;
2. the later data that will decay are input to first frequency mixer by isolator, and according to the fixedly local oscillator of the 22.3GHz that determines in the step 2, carry out the mixing first time, entering into second frequency mixer by first wave filter, carrying out the mixing second time according to the continuous local oscillator of the 27.7GHz that determines in the step 2;
3. after the mixing for the second time,,, divide and enter bandpass filter A, B according to the difference of frequency band by first hilted broadsword, eight throw switches, C, D, E, F, G, H8 frequency range carried out filtering, enters amplifier A again, B, C, D, E, F, G is after H amplifies, enter low-pass filter A, B, C, D, E, F, G, H carries out filtering once more; Wave filter A, B, C, D, E, F, G, the H frequency band specifically corresponds to 1.9GHz～2.6GHz, 2.4GHz～3.1GHz, 2.9GHz～3.6GHz, 3.4GHz～4.1GHz, 4GHz～5.1GHz, 5GHz～6.1GHz, 6GHz～7.1GHz, 6.9GHz～8.1GHz, and each frequency range has the design of overlapping, the residing band of bandpass filter position suppresses, should be about-80dB;
4. once more after the filtering, enter second hilted broadsword, eight throw switches, output signal is the radiofrequency signal of 2GHz～8GHz;
5. if this radiofrequency signal is more than 85dB, first single-pole double-throw switch (SPDT) can directly be selected radiofrequency signal is input to second single-pole double-throw switch (SPDT), output then;
6. if this radiofrequency signal is below 85dB, first single-pole double-throw switch (SPDT) can be selected by fixed attenuator radiofrequency signal to be input to second single-pole double-throw switch (SPDT), then output.
The present invention includes but be not limited to above embodiment, everyly replace and local improvement all will be considered as within protection scope of the present invention in any being equal to of carrying out under the spirit and principles in the present invention.
Claims (4)
1. low spuious, low harmonic wave, big dynamic signal creating method comprise numerical-control attenuator, isolator, first frequency mixer, first wave filter, second frequency mixer, fixedly local oscillator, continuous local oscillator, first hilted broadsword, eight throw switches, bandpass filter A (1), B (2), C (3) D (4), E (5), F (6), G (7), H (8), amplifier A (9), B (10), C (11), D (12), E (13), F (14), G (15), H (16); Low-pass filter A (17), B (18), C (19), D (20), E (21), F (22), G (23), H (24), second hilted broadsword, eight throw switches, first single-pole double-throw switch (SPDT), fixed attenuator, second single-pole double-throw switch (SPDT); It is characterized in that:
The annexation of this signal creating method is: the signal of numerical-control attenuator output is connected with first frequency mixer by isolator, and fixedly local oscillator is connected with first frequency mixer, and first frequency mixer is connected with second frequency mixer by first wave filter, simultaneously, local oscillator links to each other with second frequency mixer continuously, and the output terminal of second frequency mixer links to each other with first hilted broadsword, eight throw switches, first hilted broadsword, eight throw switches respectively with bandpass filter A (1), B (2), C (3,) D (4), E (5), F (6), G (7), H (8) connects, bandpass filter A (1), B (2), C (3) D (4), E (5), F (6), G (7), H (8) successively with corresponding amplifier A (9), B (10), C (11), D (12), E (13), F (14), G (15), H (16) and low-pass filter A (17), B (18), C (19), D (20), E (21), F (22), G (23), H (24), series connection, low-pass filter A, B, C, D, E, F, G, H is connected with second hilted broadsword, eight throw switches, second hilted broadsword, eight throw switches are connected with first single-pole double-throw switch (SPDT) again, and first single-pole double-throw switch (SPDT) is leaded up to fixed attenuator and linked to each other with second single-pole double-throw switch (SPDT), and another road directly links to each other with second single-pole double-throw switch (SPDT);
The conversion of signals relation:
Step 1: being set in the intermediate frequency base band is on the 2.8-4.0GHz, and radiofrequency signal is inputed to numerical-control attenuator, and this attenuator is limited in the amplitude of appointment to input signal;
Step 2: simultaneously, determine the frequency conversion scheme, promptly select local oscillator according to selection, output radio frequency band and the frequency mixer of intermediate frequency base band,
Step 3: the later data that will decay are input to first frequency mixer by isolator, and according to the local oscillator of determining in the step 2, carry out the mixing first time, entering into second frequency mixer, carry out the mixing second time according to the local oscillator of determining in the step 2 by first wave filter;
Step 4: after the mixing for the second time, by first hilted broadsword, eight throw switches, according to the difference of frequency band, division enters bandpass filter A (1), B (2), and C (3,) D (4), E (5), F (6), G (7), (8) 8 frequency ranges of H are carried out filtering, enter amplifier A (9) again, B (10), C (11), D (12), E (13), F (14), G (15) after H (16) amplifies, enters low-pass filter A (17), B (18), C (19), D (20), E (21), F (22), G (23), H (24) carries out filtering once more;
Step 5: after the filtering, enter second hilted broadsword, eight throw switches once more, output signal is the radiofrequency signal of 2GHz～8GHz,
Step 6: if this radiofrequency signal more than 85dB, first single-pole double-throw switch (SPDT) can directly be selected radiofrequency signal is input to second single-pole double-throw switch (SPDT), output then;
If this radiofrequency signal is below 85dB, first single-pole double-throw switch (SPDT) can be selected by fixed attenuator radiofrequency signal to be input to second single-pole double-throw switch (SPDT), then output.
2. low spuious, low harmonic wave according to claim 1, big dynamic signal creating method, it is characterized in that: the amplitude of appointment is specially the amplitude range of control of 0～90dB in the step 1.
3. low spuious, low harmonic wave according to claim 1, big dynamic signal creating method, it is characterized in that: what select in the method is fixedly local oscillator and the continuous local oscillator of 27.7GHz of 22.3GHz.
4. low spuious, low harmonic wave according to claim 1, big dynamic signal creating method, it is characterized in that: wave filter A, B, C, D, E, F, G, the H frequency band specifically corresponds to 1.9GHz～2.6GHz, 2.4GHz～3.1GHz, 2.9GHz～3.6GHz, 3.4GHz～4.1GHz, 4GHz～5.1GHz, 5GHz～6.1GHz, 6GHz～7.1GHz, 6.9GHz～8.1GHz, each frequency range has the design of overlapping, and the position inhibition of the residing band of bandpass filter should be about-80dB.
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| CN103036507A (en) * | 2012-12-10 | 2013-04-10 | 北京航天测控技术有限公司 | Down-conversion method and system based on image rejection mixing processing |
| CN103532574A (en) * | 2013-06-26 | 2014-01-22 | 中国电子科技集团公司第四十一研究所 | Device generating random intermediate frequency output in receiving frequency conversion system |
| CN103715990A (en) * | 2013-12-30 | 2014-04-09 | 北京航天测控技术有限公司 | Down-conversion system of multi-channel broadband |
| CN104393937A (en) * | 2014-11-03 | 2015-03-04 | 中国航天科工集团第三研究院第八三五七研究所 | Low-cost high-precision radio frequency attenuation device |
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| CN108008362A (en) * | 2016-10-30 | 2018-05-08 | 中国船舶重工集团公司第七二三研究所 | A kind of if radar target echo and interference generation module |
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| CN103532574A (en) * | 2013-06-26 | 2014-01-22 | 中国电子科技集团公司第四十一研究所 | Device generating random intermediate frequency output in receiving frequency conversion system |
| CN103532574B (en) * | 2013-06-26 | 2017-02-08 | 中国电子科技集团公司第四十一研究所 | Device generating random intermediate frequency output in receiving frequency conversion system |
| CN103715990A (en) * | 2013-12-30 | 2014-04-09 | 北京航天测控技术有限公司 | Down-conversion system of multi-channel broadband |
| CN103715990B (en) * | 2013-12-30 | 2016-08-17 | 北京航天测控技术有限公司 | A kind of down conversion system in multichannel broadband |
| CN104393937A (en) * | 2014-11-03 | 2015-03-04 | 中国航天科工集团第三研究院第八三五七研究所 | Low-cost high-precision radio frequency attenuation device |
| CN104808186A (en) * | 2015-05-25 | 2015-07-29 | 扬州宇安电子科技有限公司 | Portable universal radar signal simulator |
| CN108008362A (en) * | 2016-10-30 | 2018-05-08 | 中国船舶重工集团公司第七二三研究所 | A kind of if radar target echo and interference generation module |
| CN109782237A (en) * | 2017-11-10 | 2019-05-21 | 北京航天万源科技有限公司 | A kind of Radar Analog Echo and interference signal measuring device |
| CN107819440A (en) * | 2017-12-08 | 2018-03-20 | 成都前锋电子仪器有限责任公司 | A kind of mixting circuit |
| CN109188234A (en) * | 2018-09-18 | 2019-01-11 | 中国工程物理研究院应用电子学研究所 | A kind of automation integrated device of the injection of multi-path large power microwave and S parameter measurement |
| CN109188234B (en) * | 2018-09-18 | 2020-12-29 | 中国工程物理研究院应用电子学研究所 | Automatic integrated device for multi-path high-power microwave injection and S parameter measurement |
| CN112816955A (en) * | 2021-04-20 | 2021-05-18 | 南京雷电信息技术有限公司 | Reactance target simulator |
| CN113009438A (en) * | 2021-05-25 | 2021-06-22 | 成都雷通科技有限公司 | Emission type radio frequency injection type broadband multi-target simulator |
| CN114070219A (en) * | 2021-11-11 | 2022-02-18 | 中国电子科技集团公司第二十九研究所 | Filter network for eliminating electromagnetic wave interference effect |
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