CN108988884A - High bandwidth Larger Dynamic range equivalent sampling receiver - Google Patents
High bandwidth Larger Dynamic range equivalent sampling receiver Download PDFInfo
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- CN108988884A CN108988884A CN201810991507.6A CN201810991507A CN108988884A CN 108988884 A CN108988884 A CN 108988884A CN 201810991507 A CN201810991507 A CN 201810991507A CN 108988884 A CN108988884 A CN 108988884A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar Systems Or Details Thereof (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
A kind of high bandwidth Larger Dynamic range equivalent sampling receiver, comprising: switch module, for controlling whether radiofrequency signal is able to enter the equivalent sampling receiver；Gain module, positioned at the downstream of switch module；Sampling module exports sampled signal for sampling to by the radiofrequency signal after gain module；And signal processing module, for being post-processed to sampled signal, it is characterised in that, gain module includes: time-varying gain module, for carrying out Gain-scheduling control to by the radiofrequency signal after switch under the setting of time-varying gain value, to realize that dynamic gain adjusts；Amplify positioned at the downstream of time-varying gain module for gain to be fixed to radiofrequency signal with fixed gain module.The present invention can increase the dynamic range of equivalent sampling receiver under the premise of ensuring high bandwidth.
Description
Technical field
The present invention relates to radar reception technique fields, and in particular, to a kind of equivalent sampling receiver for radar.
Background technique
Super-broadband tech is a kind of the radar exploration technique that can have fine resolution and penetration depth, can be to snugly
Lower target or wall rear moving target etc. carry out non-invasive detection and are imaged.Generally without the ground penetrating radar system of carrier frequency pulse
It realizes in the time domain, receiver Typical design methods are using sampling gate structural circuit, time-domain samples step-by-step impulse circuit
And conditioning circuit realizes the conversion from radiofrequency signal to audio signal after sampling, thus reduce requirement to analog-digital converter and
Receiver does not count difficulty.This kind of receiver is realized using the method for equivalent sampling, the disadvantage is that the dynamic model of sampling gate
It encloses and is difficult to be promoted, and bandwidth realization is also not easy to reach very high.
To expand dynamic range, current equivalent sampling receiver is all that time-varying amplification or programming amplifying are placed on audio
After signal, i.e., level-one even two-stage time-varying gain amplification is done by the position after sampling gate, although such design can rise
It is promoted to certain dynamic range, but the final constrained dynamic range in sampling gate itself；And sampling gate is under the conditions of ultra wide band
Dynamic range do not exceed 60dB substantially, this modular design mode, which is unable to satisfy, reaches higher dynamic range, obtain
The demand of more deep layer echo informations.Meanwhile the dynamic range of the Performance of UWB System Receiver Under using the design of typical sampling gate
It is not high, the effect that such receiver realizes deep layer detection is influenced, when being particularly applied to ultra-deep detection.In addition, in deep space exploration
In application, radar antenna is unable to ground proximity (such as antenna is mounted on rover car body, on detector platform), aggravation transmitting letter
Number decaying and direct wave coupling, cause receiver performance further impacted.
In some Equivalent Sample Oscilloscopes in the prior art, it is also considered that control letter using preposition amplification and attenuator
Number, dynamic range is promoted, to avoid this grade of bring limitation of sampling gate, but this method is only only from the angle of signal condition
It is arranged, meets asynchronous measurement, system does not need to synchronize.The set-up mode cannot be used for ULTRA-WIDEBAND RADAR, it is above-mentioned
Mode cannot synchronously avoid through wave action, cannot be guaranteed after elapsing backward with sampling time point that echo-signal can synchronize
Ground is with stepping clock by sampling gate by reliable samples.
Summary of the invention
For the above problem existing for the existing receiver realized using equivalent sampling method, the invention proposes one kind
High bandwidth Larger Dynamic range equivalent sampling receiver comprising:
Switch module, for controlling whether radiofrequency signal is able to enter the equivalent sampling receiver；
Gain module, positioned at the downstream of the switch module；
Sampling module exports sampled signal for sampling to by the radiofrequency signal after the gain module；And
Signal processing module, for being post-processed to the sampled signal,
It is characterized in that, the gain module includes:
Time-varying gain module, for becoming under the setting of time-varying gain value to by the radiofrequency signal after switch
Gain control, to realize that dynamic gain adjusts；And
Fixed gain module, positioned at the downstream of the time-varying gain module, for increasing to be fixed to the radiofrequency signal
Benefit amplification.
In some embodiments, the switch module includes:
ON-OFF control circuit generates gatewidth signal for receiving stepping clock pulses；And
Switch, the disconnection and closure of the switch are controlled by the gatewidth signal.
In some embodiments, the sampling module includes:
Sampling pulse forms circuit, for receiving stepping clock pulses, generates sampling pulse；With
Sampling gate, positioned at the downstream of the fixed gain module, the sampling gate is complete under the action of the sampling pulse
At the sampling of the radiofrequency signal.
In some embodiments, the signal processing module includes the signal condition electricity positioned at the downstream of the sampling gate
Road, the signal conditioning circuit are used to carry out matching impedance and enhanced processing to sampled signal.
In some embodiments, the signal processing module further include:
Timing forms circuit, for receiving stepping clock pulses, generates two-way clock signal；
First sampling hold circuit, positioned at the downstream of the signal conditioning circuit；And
Second sampling hold circuit, positioned at the downstream of first sampling hold circuit,
First sampling hold circuit and the second sampling hold circuit are respectively under the control of the two-way clock signal
Sampling is carried out to the signal of signal conditioning circuit output and keeps tracking.
In some embodiments, the two-way clock signal is respectively that the first sampling keeps signal and the second sampling to keep letter
Number；
When generating the sampling pulse, first sampling hold circuit keeps the control of signal in first sampling
It is lower to enter hold mode；Second sampling hold circuit enters sampling shape under the control that second sampling keeps signal
State.
Based on the above-mentioned technical proposal it is found that the present invention at least achieve it is following the utility model has the advantages that
Relative to it is existing using equivalent sampling method realize receiver, equivalent sampling receiver proposed by the present invention,
It realizes under the premise of ensuring high bandwidth, increases the dynamic range of receiver.
Detailed description of the invention
Fig. 1 is the structural block diagram of the high bandwidth Larger Dynamic range equivalent sampling receiver of the embodiment of the present invention；
Timing diagram when Fig. 2 is the equivalent sampling operation of receiver in Fig. 1；
Fig. 3 is to carry out dynamic range and bandwidth to the high bandwidth Larger Dynamic range equivalent sampling receiver of the embodiment of the present invention
The schematic diagram of test；
Fig. 4 is the schematic diagram calibrated to the microwave signal source in Fig. 3；
Fig. 5 is the bandwidth test result figure of the equivalent sampling receiver of the embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Clearly and completely describe.Obviously, described embodiment is a part of the embodiments of the present invention, instead of all the embodiments.
Based on described the embodiment of the present invention, those of ordinary skill in the art are obtained under the premise of being not necessarily to creative work
Every other embodiment, shall fall within the protection scope of the present invention.
Unless otherwise defined, the technical term or scientific term that the present invention uses should be tool in fields of the present invention
The ordinary meaning for thering is the personage of general technical ability to be understood.
The embodiment of the present invention proposes a kind of high bandwidth Larger Dynamic range equivalent sampling receiver comprising switching molding
Block, gain module, sampling module and signal processing module, are used as radar receiver.Wherein, switch module is penetrated for controlling
Whether frequency signal is able to enter receiver；Sampling module is exported for sampling to by the radiofrequency signal after gain module
Sampled signal, signal processing module is for post-processing sampled signal.
It referring to Fig.1, is the structural block diagram of the equivalent sampling receiver of the embodiment of the present invention.Gain module is located at switch module
Downstream, gain module can be divided into time-varying gain module 3 and fixed gain module 4.Wherein time-varying gain module 3 is used in time-varying
Under the setting of yield value D, Gain-scheduling control is carried out to by the radiofrequency signal after switch, to realize that dynamic gain adjusts.Gu
The downstream that gain module 4 is located at time-varying gain module 3 is determined, for gain amplification to be fixed to radiofrequency signal.
According to some embodiments, switch module includes ON-OFF control circuit 2 and switch 1.Wherein ON-OFF control circuit 2 is used for
Stepping clock pulses is received, gatewidth signal is generated.By the gatewidth signal come the disconnection and closure of control switch 1.This
In embodiment, switch 1 is switched as equivalent sampling receiver front end, gets off to guarantee echo-signal in the control of gatewidth signal
Whether can enter equivalent sampling receiver, and obstructs direct-path signal；When the rising edge of stepping clock pulses arrives, switch control
Circuit 2 processed forms gatewidth signal, with control switch 1.
According to some embodiments, sampling module includes: that sampling pulse forms circuit 6 and sampling gate 5.Sampling pulse forms electricity
Road 6 generates sampling pulse for receiving stepping clock pulses；Sampling gate 5 is located at the downstream of fixed gain module 4, and sampling gate 5 exists
The sampling of radiofrequency signal is completed under the action of sampling pulse.For example, sampling pulse formation circuit 6 is whole by the progress of stepping clock pulses
Shape, acceleration generate the sampling pulse of picosecond magnitude, to open sampling gate 5.
In the embodiment of the present invention, the signal that sampling gate 5 and switch 1 are all generated by step delay pulse is come synchronously control；
Pass through the switch 1 and time variable gain circuit 3 of the front end setting synchronously control of the sampling gate 5 in equivalent sampling receiver and fixation
Gain circuitry 4 improves the dynamic range of receiver under the premise of ensuring that bandwidth is met the requirements；This design method has
Real-time is high, dynamic range promotes the advantages that big, few using resource.
According to some embodiments, signal processing module includes the signal conditioning circuit 7 positioned at the downstream of sampling gate 5, the letter
Number conditioning circuit 7 is used to carry out matching impedance and enhanced processing to sampled signal.
According to some embodiments, signal processing module further includes that timing forms circuit 8, the first sampling hold circuit 9 and the
Two sampling hold circuits 10.First sampling hold circuit 9 is located at the downstream of signal conditioning circuit 7；Second sampling hold circuit 10
Positioned at the downstream of the first sampling hold circuit 9.Timing forms circuit 8 and receives stepping clock pulses, generates two-way clock signal；The
One sampling hold circuit 9 and the second sampling hold circuit 10 are respectively under the control of two-way clock signal to the signal condition electricity
The signal of road output carries out sampling and keeps tracking.
Timing diagram when referring further to Figure 2, for the equivalent sampling operation of receiver in Fig. 1.Wherein, PRF is tool
There is the stepping clock pulses of repetition rate, step delay circuit can be triggered by fpga chip and generated.SWTH is gatewidth signal,
For controlling the switch 1 of equivalent sampling receiver front end, when the rising edge of PRF arrives, trigger switch control circuit 2 generates wave
Door width signal SWTH.STRBE is sampling pulse, for opening sampling gate, as shown in Fig. 2, its action time is in wave gate-width
The center of band signal SWTH.Above-mentioned two-way clock signal is that the first sampling keeps the sampling of signal S&H1 and second to keep letter
Number S&H2, when generating sampling pulse STRBE, the first sampling hold circuit 9 is kept in the first sampling under the control of signal S&H1
Into hold mode；Second sampling hold circuit 10 enters sample states under the control that the second sampling keeps signal S&H2.
The design bandwidth of equivalent sampling receiver in preferred implementation of the invention is 4GHz, and receiver front end is opened thus
It closes 1 and uses microwave-type spst switch, bandwidth meets DC-6GHz and high-isolation requirement, and representative value is 55dB@2GHz.And it opens
Control circuit 2 is closed by gatewidth signal SWTH come the gating time of control switch 1.In Fig. 2, the clock signal of receiver
From stepping clock pulses PRF, the minimum period of repetition rate is T；Gatewidth t0It is determined by actual design requirement, with
Investigation depth is related, and 300ns gatewidth is used in the present embodiment, has met the use of current high bandwidth, Larger Dynamic receiver
It is required that.
In preferred implementation of the invention, time-varying gain module 3 is to carry out variable-gain to by the radiofrequency signal after switch 1
Control, to realize the adjustment of dynamic range.And the typical control methods of equivalent sampling receiver are in stepping clock pulses PRF
Under the action of, according to equivalent sequential sampling mode, before each initial samples, as shown in Fig. 2, setting time-varying gain value Dn-1, is obtained
Obtain the variable-gain of this sampling point.Before next stepping clock pulses PRF arrival, setting time-varying gain value is Dn or maintains Dn-1
Constant, this is determined by actual demand, so that one group of Variable gain control method can be obtained, constitutes a controlling curve.Equivalent sampling
When operation of receiver, output control is carried out by this curve, thus obtains dynamic gain adjustment, so that dynamic range is effectively mentioned
It rises.And fixed gain module 4 is amplified for signal fixed gain, conducive to sampling gate 5 to the sampling operation of the radiofrequency signal.
In preferred implementation of the invention, stepping clock pulses PRF is divided into two-way: access switch control circuit 1 all the way is gone
The switch 1 for controlling front end is opened, so that signal, which enters time-varying gain module 3 by switch 1, carries out gain adjustment；Another way enters
Sampling pulse forms circuit 6 and timing forms circuit 8.Sampling pulse generation circuit 6 is used to form the ultra-narrow pulse of picosecond magnitude,
Ensure that sampling gate 5 is reliably opened under the effect of this ultra-narrow pulse, input signal is by 5 reliable samples of sampling gate.Preferably, it samples
Door 5 is constituted using sampling phase detectors (SPD), containing step-recovery diode (SRD) all the way inside the SPD, can will be sampled
Further shaping and acceleration are done in pulse, and ensure the symmetry of sampling pulse；While containing two sampling diodes inside it, two
The consistency of diode is preferable, to ensure that the bandwidth demand of sampling gate, the SPD bandwidth selected in the present embodiment is
22GHz。
As shown in Fig. 2, the first sampling hold circuit 9 is at once by sample states after sampling pulse STRBE opens sampling gate
Into hold mode, the control of signal S&H1 signal is kept by the first sampling, hold mode is low level state, and width maintains t2,
Its size meets the reliable samples of the second sampling hold circuit 10；And the second sampling hold circuit 10 is kept by the second sampling
The control of signal S&H2 signal, process is with the former on the contrary, delay t3Sample states, sampling time t are entered by hold mode afterwards4,
Meet minimum time requirement.After t4, signal is maintained by the second sampling hold circuit 10 and is sampled out until next time
Beginning is just updated.Its ideal retention time is consistent with the repetition period.
The output signal of second sampling hold circuit 10 is low frequency signal, the signal can through rear class filtering circuit filtering or
It is digitized again by low speed ADC, is acquired to realize radiofrequency signal being reduced to audio signal, reduces back-end circuit
Design and processing requirement.
Be described below to the present invention be preferably implemented in equivalent sampling receiver carry out dynamic range and bandwidth test
As a result.Referring to Fig. 3, testing device used includes signal source 11, microwave signal source 12, equivalent sampling receiver 13 and real-time oscillography
Device 14.
Before test, it is necessary first to be calibrated to microwave signal source 12.Referring to Fig. 4, microwave signal source 12 successively presses frequency
The standard signal of point output setting records all frequency points by 50 ohm characteristic impedance situations by PC16 after power meter 15
The power output of lower acquisition.Calibration herein is that microwave signal source output is uniformly calibrated at the position of end face A, then by each frequency
The actual power value of point measurement is uniformly calibrated to certain calibration power value, such as 0dBm, and is stored in microwave signal source 12, implements test
When, the dynamic call calibration value is calibrated.
Referring to Fig. 3, output test bandwidth is successively manually selected by setpoint frequency point by the microwave signal source 12 after calibrating, is moved
State range.Bandwidth test result is as shown in Figure 5, it is seen then that the present invention can get the bandwidth result of 4GHz or more -3dB.Dynamic range
Test result as shown in the table below:
In table, temperature is incubator set temperature；Telemetering is amplifier module telethermograph.As it can be seen that dynamic range is better than
85dB.Therefore, equivalent sampling receiver provided in an embodiment of the present invention can increase receiver in the case where guaranteeing high bandwidth
Dynamic range.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in protection of the invention
Within the scope of.
Claims (6)
1. a kind of high bandwidth Larger Dynamic range equivalent sampling receiver, comprising:
Switch module, for controlling whether radiofrequency signal is able to enter the equivalent sampling receiver；
Gain module, positioned at the downstream of the switch module；
Sampling module exports sampled signal for sampling to by the radiofrequency signal after the gain module；And
Signal processing module, for being post-processed to the sampled signal,
It is characterized in that, the gain module includes:
Time-varying gain module, for carrying out variable-gain to by the radiofrequency signal after switch under the setting of time-varying gain value
Control, to realize that dynamic gain adjusts；With
Fixed gain module is put positioned at the downstream of the time-varying gain module for gain to be fixed to the radiofrequency signal
Greatly.
2. high bandwidth Larger Dynamic range equivalent sampling receiver according to claim 1, which is characterized in that the switching molding
Block includes:
ON-OFF control circuit generates gatewidth signal for receiving stepping clock pulses；And
Switch, the disconnection and closure of the switch are controlled by the gatewidth signal.
3. high bandwidth Larger Dynamic range equivalent sampling receiver according to claim 1, which is characterized in that the sampling mould
Block includes:
Sampling pulse forms circuit, for receiving stepping clock pulses, generates sampling pulse；And
Sampling gate, positioned at the downstream of the fixed gain module, the sampling gate completes institute under the action of the sampling pulse
State the sampling of radiofrequency signal.
4. high bandwidth Larger Dynamic range equivalent sampling receiver according to claim 3, which is characterized in that at the signal
Reason module includes the signal conditioning circuit positioned at the sampling passage downstream, and the signal conditioning circuit is used to carry out sampled signal
Matching impedance and enhanced processing.
5. high bandwidth Larger Dynamic range equivalent sampling receiver according to claim 4, which is characterized in that at the signal
Manage module further include:
Timing forms circuit, for receiving stepping clock pulses, generates two-way clock signal；
First sampling hold circuit, positioned at the downstream of the signal conditioning circuit；And
Second sampling hold circuit, positioned at the downstream of first sampling hold circuit,
First sampling hold circuit and the second sampling hold circuit are respectively under the control of the two-way clock signal to institute
The signal for stating signal conditioning circuit output carries out sampling and keeps tracking.
6. high bandwidth Larger Dynamic range equivalent sampling receiver according to claim 5, which is characterized in that when the two-way
Sequential signal is respectively that the first sampling keeps signal and the second sampling to keep signal；
When generating the sampling pulse, first sampling hold circuit it is described first sampling keep signal control under into
Enter hold mode；Second sampling hold circuit enters sample states under the control that second sampling keeps signal.
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