CN104135299B - A kind of dual pathways two-stage frequency conversion broadband receiver and auto gain control method thereof - Google Patents
A kind of dual pathways two-stage frequency conversion broadband receiver and auto gain control method thereof Download PDFInfo
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Abstract
The invention discloses a kind of dual pathways two-stage frequency conversion broadband receiver and auto gain control method thereof.Dual pathways two-stage frequency conversion broadband receiver, control circuit is judged including receiving passage, analog-digital converter and decay, receiving passage to be divided into A road to receive passage and B road receiving passage, A road receives passage and B road receives that channel design is identical all includes advance signal processing section, one-level frequency conversion section and two grades of frequency conversion sections.Dual pathways two-stage frequency conversion broadband receiver has automatic gain control function, it is ensured that receiver always works at linear zone, remains the original amplitude information of received signal simultaneously.The auto gain control method that the present invention provides, can judge to receive the size of signal in advance according to current pulse amplitude, according to preset first attenuator of result of determination and the duty of the second attenuator, avoid repeatedly switching the service aisle of attenuator, make receiver always work at linear zone.
Description
Technical field
The present invention relates to a kind of dual pathways two-stage frequency conversion broadband receiver and auto gain control method thereof.
Background technology
Along with low probability of intercept (LPI) radar and the appearance of frequency-agile radar so that modern radar antagonism signal environment occurs new special
Levy: the quantity of radiation source is many, distribution density is big, signal is overlapping serious and signal parameter is changeable etc., and this just requires that receiver is necessary
There is the features such as the widest process bandwidth, high sensitivity, Larger Dynamic scope.Existing two-stage frequency conversion receiver typically uses at letter
Number receive in passage and to carry out the scheme of limited range enlargement to meet receiver high sensitivity and the requirement of Larger Dynamic scope, this scheme
Shortcoming is the original amplitude information that lost and receive signal, in the environment of, signal parameter increasing at signal density is changeable,
The accuracy rate of signal identification to be improved, the amplitude information of signal is essential, and this just requires that two-stage frequency conversion receiver receives signal
Amplitude whether great or small, receiver all should be operated in linear zone.
Modern radar antagonism signal environment presents that radiation source quantity is many, distribution density is big, signal is overlapping serious and signal parameter is many
The features such as change, traditional reconnaissance receiver have employed two-stage frequency conversion superhet receiver scheme, highly sensitive for meeting receiver
Degree and the requirement of Larger Dynamic scope, the afterbody intermediate frequency amplifier of this tradition reconnaissance receiver have employed the side of limiting amplifier
Case, the requirement of discriminator sensitivity during to meet small-signal, the signal of phase discriminator output gives analog-digital converter and carries out analog to digital conversion,
Its scheme block diagram is as shown in Figure 1.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention proposes a kind of dual pathways two-stage frequency conversion broadband receiver and automatic gain thereof
Control method, it is ensured that receiver always works at linear zone.
The present invention adopts the following technical scheme that
A kind of dual pathways two-stage frequency conversion broadband receiver, judges control circuit including receiving passage, analog-digital converter and decay, connects
Receive passage to be divided into A road to receive passage and B road receiving passage, before A road receives passage and B road receives that channel design is identical and all include
Confidence processing section, one-level frequency conversion section and two grades of frequency conversion sections, have the first attenuator in one-level frequency conversion section, has in two grades of frequency conversion sections
Two attenuators, the first attenuator and the second attenuator are equipped with put-through channel and attenuation path；
A road receives the outfan connection of passage one-level frequency conversion section A road logarithmic detector, and A road logarithmic detector connects decay and judges
Control circuit, B road receives the outfan connection of passage one-level frequency conversion section has B road logarithmic detector, the connection of B road logarithmic detector to decline
Subtract judgement control circuit, A road logarithmic detector and B road logarithmic detector and can judge A road signal and the amplitude size of B road signal；
Signal enters analog-digital converter after A road receives passage and B road reception passage processes respectively, overflows in the A road of analog-digital converter
Go out signal and the spill over input attenuation of B road judges that control circuit, decay judge that control circuit is defeated after input signal is processed judgement
Going out the first attenuation control signal and the second attenuation control signal, the first attenuation control signal controls A road and receives passage and the reception of B road
The first attenuator in passage, the second attenuation control signal controls A road and receives the second attenuator in passage and B road reception passage.
One dual pathways two-stage frequency conversion broadband receiver of the present invention, described signal first passes through switch filter at advance signal processing section
Filtering Processing, then through limiter diode amplitude limiting processing, after through switching pad, finally enter low-noise amplifier and amplify signal；
Signal enters one-level frequency conversion section after advance signal processing section processes, and signal is mixed at one-level frequency conversion Duan Xianjing the first frequency mixer
Process, then through the first intermediate-frequency filter, enter the first intermediate frequency amplifier afterwards；
Signal enters two grades of frequency conversion sections after one-level frequency conversion section processes, and signal switchs at two grades of frequency conversion Duan Xianjing, the second attenuator,
Again through the second frequency mixer Frequency mixing processing, after the second intermediate-frequency filter filtering, enter the second intermediate frequency amplifier afterwards.
One dual pathways two-stage frequency conversion broadband receiver of the present invention, described A road receives passage and B road receives first in passage and mixes
Frequently the first vibration frequency that the local oscillation signal input input of device is identical, A road receives passage and B road receives second in passage and mixes
Frequently the second local frequency that the local oscillation signal input input of device is identical.
According to the auto gain control method of above-mentioned a kind of dual pathways two-stage frequency conversion broadband receiver, described decay judges control circuit
Amplitude size according to current pulse signal judges to receive the size of signal in advance, according to preset first attenuator of result of determination and
The duty of the second attenuator, step is as follows:
Step one: set the interval of detection output voltage, signal and B road logarithmic detector to the output of A road logarithmic detector are defeated
The signal gone out carries out electrical level judging respectively；If electrical level judging result is high, controls the first attenuator and be operated in attenuation path；As
Really electrical level judging result is low, controls the first attenuator and is operated in put-through channel；
Step 2: judge A road spill over and the low and high level of B road spill over of analog-digital converter；If electrical level judging is tied
Fruit is high, controls the second attenuator and is operated in attenuation path；If electrical level judging result is low, controls the second attenuator and be operated in
Put-through channel.
Described step one sets the interval of detection output voltage, is respectively designated as Vdetmin、Vdetmax, A road logarithmic detector is defeated
Go out signal be Adet and B road logarithmic detector output signal be Bdet, carry out electrical level judging respectively, electrical level judging uses as follows
Step:
A () judges Adet ∈ [Vdetmin, Vdetmax] whether set up, as Adet ∈ [Vdetmin, Vdetmax], perform step (b),
Work as Adet > Vdetmax, perform step (c), as Adet < Vdetmin, perform step (d)；
B () judges Bdet ∈ [Vdetmin, Vdetmax] whether set up, as Bdet ∈ [Vdetmin, Vdetmax], perform step (e),
Work as Bdet > Vdetmax, perform step (c), as Bdet < Vdetmin, perform step (d)；
C () judges whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output first
Attenuation control signal, makes the first attenuator be operated in attenuation path；If being not in inter-train pause, time delay, repeats step (c)
Until decay judges that control circuit exports the first attenuation control signal, perform step (e)；
D () judges whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output first
Attenuation control signal, makes the first attenuator be operated in put-through channel；If being not in inter-train pause, time delay, repeat step (d),
Until decay judges that control circuit exports the first attenuation control signal, perform step (e)；
E () judges whether DP signal is in arteries and veins, if be in arteries and veins, repeat step (a)；If be not in arteries and veins, prolong
Time, repeat step (e), until signal is in arteries and veins.
Described step 2 judges A road spill over and the low and high level of B road spill over of analog-digital converter, uses following step
Rapid:
(1) whether the level judging A road spill over and B road spill over is high level, if at least one is held for high level
Row step (2), on the contrary perform step (3)；
(2) judging whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output second
Attenuation control signal, makes the second attenuator be operated in attenuation path, performs step (4)；If being not in inter-train pause, time delay,
Repeat step (2) until decay judges that control circuit exports the second attenuation control signal, perform step (4)；
(3) judging whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output second
Attenuation control signal, makes the second attenuator be operated in put-through channel, performs step (4)；If being not in inter-train pause, time delay,
Repeat step (3) until decay judges that control circuit exports the second attenuation control signal, perform step (4)；
(4) judging whether DP signal is in arteries and veins, if be in arteries and veins, repeating step (1)；If be not in arteries and veins, prolong
Time, repeat step (4), until signal is in arteries and veins.
The Advantageous Effects of the present invention:
The dual pathways two-stage frequency conversion broadband receiver that the present invention provides has automatic gain control function, it is ensured that receiver work always
Make in linear zone, remain the amplitude information receiving signal simultaneously, and make receiver have high sensitivity, Larger Dynamic scope
Advantage.
The auto gain control method that the present invention provides, can judge to receive letter according to the amplitude size of current pulse signal in advance
Number size, according to preset first attenuator of result of determination and the duty of the second attenuator, it is to avoid switching attenuator repeatedly
Service aisle, makes receiver always work at linear zone.
Accompanying drawing explanation
Fig. 1 is the dual pathways two-stage frequency conversion broadband receiver structured flowchart of prior art.
Fig. 2 is the dual pathways two-stage frequency conversion broadband receiver structured flowchart of the present invention.
Fig. 3 judges control circuit block diagram for decay.
Fig. 4 is the generation flow chart of the first attenuation control signal.
Fig. 5 is the generation flow chart of the second attenuation control signal.
Detailed description of the invention
Detailed description of the invention in conjunction with 2 to 5 couples of present invention of accompanying drawing is described further:
A kind of dual pathways two-stage frequency conversion broadband receiver, judges control circuit including receiving passage, analog-digital converter and decay, connects
Receive passage to be divided into A road to receive passage and B road receiving passage, before A road receives passage and B road receives that channel design is identical and all include
Confidence processing section, one-level frequency conversion section and two grades of frequency conversion sections, have the first attenuator in one-level frequency conversion section, has in two grades of frequency conversion sections
Two attenuators, the first attenuator and the second attenuator are equipped with put-through channel and attenuation path.
A road receives the outfan connection of passage one-level frequency conversion section A road logarithmic detector, and A road logarithmic detector connects decay and judges
Control circuit, B road receives the outfan connection of passage one-level frequency conversion section has B road logarithmic detector, the connection of B road logarithmic detector to decline
Subtract judgement control circuit, A road logarithmic detector and B road logarithmic detector and can judge A road signal and the amplitude size of B road signal.
Signal enters analog-digital converter after A road receives passage and B road reception passage processes respectively, overflows in the A road of analog-digital converter
Go out signal and the spill over input attenuation of B road judges that control circuit, decay judge that control circuit is defeated after input signal is processed judgement
Going out the first attenuation control signal and the second attenuation control signal, the first attenuation control signal controls A road and receives passage and the reception of B road
The first attenuator in passage, the second attenuation control signal controls A road and receives the second attenuator in passage and B road reception passage.
Signal first passes through switch filter Filtering Processing at advance signal processing section, then through limiter diode amplitude limiting processing, after warp
Switching pad, finally enters low-noise amplifier and amplifies signal；Signal enters one-level frequency conversion after advance signal processing section processes
Section, signal is in one-level frequency conversion Duan Xianjing the first frequency mixer Frequency mixing processing, then through the first intermediate-frequency filter, enters the first intermediate frequency and put
Big device；Signal enters two grades of frequency conversion sections after one-level frequency conversion section processes, and signal switchs at two grades of frequency conversion Duan Xianjing, the second attenuator,
Again through the second frequency mixer Frequency mixing processing, after the second intermediate-frequency filter filtering, enter the second intermediate frequency amplifier afterwards.
A road receives the local oscillation signal input of the first frequency mixer in passage and B road reception passage and inputs the first identical local oscillator frequency
Rate, A road receives the local oscillation signal input of the second frequency mixer in passage and B road reception passage and inputs the second identical local oscillator frequency
Rate.
Proposing a kind of auto gain control method according to above-mentioned dual pathways two-stage frequency conversion broadband receiver, decay judges control circuit root
Judge to receive the size of signal in advance according to the amplitude size of current pulse signal, according to preset first attenuator of result of determination and
The duty of two attenuators, step is as follows:
Step one: set the interval of detection output voltage, signal and B road logarithmic detector to the output of A road logarithmic detector are defeated
The signal gone out carries out electrical level judging respectively；If electrical level judging result is high, controls the first attenuator and be operated in attenuation path；As
Really electrical level judging result is low, controls the first attenuator and is operated in put-through channel.
As shown in Figure 4, set the interval of detection output voltage, be respectively designated as Vdetmin、Vdetmax, A road logarithmic detector is defeated
Go out signal be Adet and B road logarithmic detector output signal be that Bdet carries out electrical level judging respectively, the first attenuation control signal is
1, the first attenuator is operated in attenuation path, and the first attenuation control signal is 0, and the first attenuator is operated in put-through channel, level
Judgement employing following steps:
A () judges Adet ∈ [Vdetmin, Vdetmax] whether set up, as Adet ∈ [Vdetmin, Vdetmax], perform step (b),
Work as Adet > Vdetmax, perform step (c), as Adet < Vdetmin, perform step (d)；
B () judges Bdet ∈ [Vdetmin, Vdetmax] whether set up, as Bdet ∈ [Vdetmin, Vdetmax], perform step (e),
Work as Bdet > Vdetmax, perform step (c), as Bdet < Vdetmin, perform step (d)；
C () judges whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output first
Attenuation control signal, makes the first attenuator be operated in attenuation path；If being not in inter-train pause, time delay, repeats step (c)
Until decay judges that control circuit exports the first attenuation control signal, perform step (e)；
D () judges whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output first
Attenuation control signal, makes the first attenuator be operated in put-through channel；If being not in inter-train pause, time delay, repeat step (d),
Until decay judges that control circuit exports the first attenuation control signal, perform step (e)；
E () judges whether DP signal is in arteries and veins, if be in arteries and veins, repeat step (a)；If be not in arteries and veins, prolong
Time, repeat step (e), until signal is in arteries and veins.
Step 2: judge A road spill over and the low and high level of B road spill over of analog-digital converter；If electrical level judging is tied
Fruit is high, controls the second attenuator and is operated in attenuation path；If electrical level judging result is low, controls the second attenuator and be operated in
Put-through channel.
As shown in Figure 5, it is judged that the A road spill over of analog-digital converter is that Aover_range, B road spill over is
Bover_range, the second attenuation control signal is 1, and the second attenuator is operated in attenuation path, and the second attenuation control signal is 0,
Second attenuator is operated in put-through channel, employing following steps:
(1) whether the level judging A road spill over and B road spill over is high level, if at least one is held for high level
Row step (2), on the contrary perform step (3)；
(2) judging whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output second
Attenuation control signal, makes the second attenuator be operated in attenuation path, performs step (4)；If being not in inter-train pause, time delay,
Repeat step (2) until decay judges that control circuit exports the second attenuation control signal, perform step (4)；
(3) judging whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output second
Attenuation control signal, makes the second attenuator be operated in put-through channel, performs step (4)；If being not in inter-train pause, time delay,
Repeat step (3) until decay judges that control circuit exports the second attenuation control signal, perform step (4)；
(4) judge whether DP signal is in arteries and veins, if repeating step (1) in being in arteries and veins；If be not in arteries and veins, time delay,
Repeat step (4), until signal is in arteries and veins.
Dual pathways two-stage frequency conversion broadband receiver has automatic gain control function, it is ensured that receiver always works at linear zone,
Remain the amplitude information receiving signal simultaneously.The signal determining method that the present invention provides, can be according to current pulse signal
Amplitude size judges to receive the size of signal in advance, according to preset first attenuator of result of determination and the work shape of the second attenuator
State, it is to avoid repeatedly switch the service aisle of attenuator, makes receiver always work at linear zone.
Certainly, only presently preferred embodiments of the present invention described above, the present invention is not limited to enumerate above-described embodiment, it should say
Bright, any those of ordinary skill in the art are under the guidance of this specification, and all equivalents made substitute, substantially become
Shape form, within all falling within the essential scope of this specification, ought to be protected by the present invention.
Claims (6)
1. a dual pathways two-stage frequency conversion broadband receiver, it is characterised in that include that receiving passage, analog-digital converter and decay sentences
Disconnected control circuit, receives passage and is divided into A road to receive passage and B road reception passage, and A road receives passage and B road receives passage knot
Structure is identical all includes advance signal processing section, one-level frequency conversion section and two grades of frequency conversion sections, has the first attenuator in one-level frequency conversion section, two
The second attenuator, the first attenuator and the second attenuator is had to be equipped with put-through channel and attenuation path in level frequency conversion section；
A road receives the outfan connection of passage one-level frequency conversion section A road logarithmic detector, and A road logarithmic detector connects decay and judges
Control circuit, B road receives the outfan connection of passage one-level frequency conversion section has B road logarithmic detector, the connection of B road logarithmic detector to decline
Subtract judgement control circuit, A road logarithmic detector and B road logarithmic detector and can judge A road signal and the amplitude size of B road signal；
Signal enters analog-digital converter after A road receives passage and B road reception passage processes respectively, overflows in the A road of analog-digital converter
Go out signal and the spill over input attenuation of B road judges that control circuit, decay judge that control circuit is defeated after input signal is processed judgement
Going out the first attenuation control signal and the second attenuation control signal, the first attenuation control signal controls A road and receives passage and the reception of B road
The first attenuator in passage, the second attenuation control signal controls A road and receives the second attenuator in passage and B road reception passage.
A kind of dual pathways two-stage frequency conversion broadband receiver the most according to claim 1, it is characterised in that described signal is front
Confidence processing section first passes through switch filter Filtering Processing, then through limiter diode amplitude limiting processing；
Signal through advance signal processing section process after enter one-level frequency conversion section, signal at one-level frequency conversion Duan Xianjing the first attenuator, then
Enter low-noise amplifier and amplify signal, through the first frequency mixer Frequency mixing processing, then through the first intermediate-frequency filter, enter the afterwards
One intermediate frequency amplifier；
Signal enters two grades of frequency conversion sections after one-level frequency conversion section processes, and signal switchs at two grades of frequency conversion Duan Xianjing, the second attenuator,
Again through the second frequency mixer Frequency mixing processing, after the second intermediate-frequency filter filtering, enter the second intermediate frequency amplifier afterwards.
A kind of dual pathways two-stage frequency conversion broadband receiver the most according to claim 2, it is characterised in that described A road receives
Passage and B road receive the local oscillation signal input of the first frequency mixer in passage and input identical first vibration frequency, and A road receives
Passage and B road receive the local oscillation signal input of the second frequency mixer in passage and input the second identical local frequency.
The auto gain control method of a kind of dual pathways two-stage frequency conversion broadband receiver the most according to claim 3, its feature
Being, described decay judges that control circuit judges to receive the size of signal, root in advance according to the amplitude size of current pulse signal
According to preset first attenuator of result of determination and the duty of the second attenuator, step is as follows:
Step one: set the interval of detection output voltage, signal and B road logarithmic detector to the output of A road logarithmic detector are defeated
The signal gone out carries out electrical level judging respectively；If electrical level judging result is high, controls the first attenuator and be operated in attenuation path；As
Really electrical level judging result is low, controls the first attenuator and is operated in put-through channel；
Step 2: judge A road spill over and the low and high level of B road spill over of analog-digital converter；If electrical level judging is tied
Fruit is high, controls the second attenuator and is operated in attenuation path；If electrical level judging result is low, controls the second attenuator and be operated in
Put-through channel.
The auto gain control method of a kind of dual pathways two-stage frequency conversion broadband receiver the most according to claim 4, its feature
It is, described step one sets the interval of detection output voltage, is respectively designated as Vdetmin、Vdetmax, A road logarithmic detector
Output signal be Adet and B road logarithmic detector output signal be Bdet, carry out electrical level judging respectively, electrical level judging uses such as
Lower step:
A () judges Adet ∈ [Vdetmin, Vdetmax] whether set up, as Adet ∈ [Vdetmin, Vdetmax], perform step (b),
Work as Adet > Vdetmax, perform step (c), as Adet < Vdetmin, perform step (d)；
B () judges Bdet ∈ [Vdetmin, Vdetmax] whether set up, as Bdet ∈ [Vdetmin, Vdetmax], perform step (e),
Work as Bdet > Vdetmax, perform step (c), as Bdet < Vdetmin, perform step (d)；
C () judges whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output first
Attenuation control signal, makes the first attenuator be operated in attenuation path；If being not in inter-train pause, time delay, repeats step (c)
Until decay judges that control circuit exports the first attenuation control signal, perform step (e)；
D () judges whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output first
Attenuation control signal, makes the first attenuator be operated in put-through channel；If being not in inter-train pause, time delay, repeat step (d),
Until decay judges that control circuit exports the first attenuation control signal, perform step (e)；
E () judges whether DP signal is in arteries and veins, if be in arteries and veins, repeat step (a)；If be not in arteries and veins, prolong
Time, repeat step (e), until signal is in arteries and veins.
The auto gain control method of a kind of dual pathways two-stage frequency conversion broadband receiver the most according to claim 4, its feature
It is, described step 2 judges A road spill over and the low and high level of B road spill over of analog-digital converter, uses as follows
Step:
(1) whether the level judging A road spill over and B road spill over is high level, if at least one is held for high level
Row step (2), on the contrary perform step (3)；
(2) judging whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output second
Attenuation control signal, makes the second attenuator be operated in attenuation path, performs step (4)；If being not in inter-train pause, time delay,
Repeat step (2) until decay judges that control circuit exports the second attenuation control signal, perform step (4)；
(3) judging whether DP signal is in inter-train pause, if being in inter-train pause, decay judges control circuit output second
Attenuation control signal, makes the second attenuator be operated in put-through channel, performs step (4)；If being not in inter-train pause, time delay,
Repeat step (3) until decay judges that control circuit exports the second attenuation control signal, perform step (4)；
(4) judging whether DP signal is in arteries and veins, if be in arteries and veins, repeating step (1)；If be not in arteries and veins, prolong
Time, repeat step (4), until signal is in arteries and veins.
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| CN109217886A (en) * | 2018-08-21 | 2019-01-15 | 北京无线电测量研究所 | A kind of two-way down conversion components |
| CN111257880B (en) * | 2018-11-30 | 2022-10-04 | 深圳市海思半导体有限公司 | Radar and target detection method |
| CN110045256A (en) * | 2019-05-17 | 2019-07-23 | 广东电网有限责任公司 | A kind of SHF frequency range local discharge signal reception circuit |
| CN110336573A (en) * | 2019-05-29 | 2019-10-15 | 安徽四创电子股份有限公司 | A kind of X-band Larger Dynamic receiver |
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| CN103647564B (en) * | 2013-12-06 | 2015-09-09 | 陕西烽火实业有限公司 | A kind of binary channels short-wave signal diversity system and method for reseptance thereof |
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| US4301445A (en) * | 1979-12-10 | 1981-11-17 | General Electric Company | Communication system and method having wide dynamic range digital gain control |
| US7460623B1 (en) * | 2003-02-06 | 2008-12-02 | Broadlogic Network Technologies Inc. | Digital two-stage automatic gain control |
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