CN106291479A - A kind of borehole radar step frequency controllable gain receiver front end - Google Patents
A kind of borehole radar step frequency controllable gain receiver front end Download PDFInfo
- Publication number
- CN106291479A CN106291479A CN201610621898.3A CN201610621898A CN106291479A CN 106291479 A CN106291479 A CN 106291479A CN 201610621898 A CN201610621898 A CN 201610621898A CN 106291479 A CN106291479 A CN 106291479A
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- Prior art keywords
- gain
- signal
- receiver front
- circuit
- borehole radar
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/34—Gain of receiver varied automatically during pulse-recurrence period, e.g. anti-clutter gain control
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Geophysics And Detection Of Objects (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention belongs to the hardware component units of borehole radar logging system, be specifically related to a kind of borehole radar step frequency controllable gain receiver front end.The present invention realizes gain step value adjusted control in real time according to the size of final output signal by single chip machine controlling circuit, and provides Open-closed-loop controlled gain control function.Frequency mixer and filter circuit have carried out down-converted at least twice to input signal, make the IF signal frequency smaller bandwidth finally exported, it is achieved the instant bandwidth that receiver is corresponding is the least, effectively inhibit the interference of noise, improve the sensitivity of system.In gain control unit, the use of gainequalizer achieves High Gain Flatness PA, and ultimately provides 13dB～95dB linear gain control, and the gain stepping of 0.5dB～16dB.Present invention achieves the asynchronous pattern of transmitting-receiving, High Gain Flatness PA, gain control is convenient；Be applicable to receiving the great receiver system of signal excursion.
Description
Technical field
The invention belongs to the hardware component units of borehole radar logging system, be mainly used in reception antenna rear end to signal
Processing, output two-way radio frequency signal supply subsequent data acquisition unit, being specifically related to a kind of borehole radar step frequency can
Control gain receiver front end.
Background technology
Along with mankind's increase day by day to subterranean resource demands such as oil, gas, people are descending the research of Detection Techniques over the ground
Increasingly increase.This is accomplished by furtheing investigate resource distribution and geological structure situation, and too high experimental cost, compel to be essential
Want a kind of pinpoint accuracy, high efficiency logging method.Borehole radar is applied to oil well logging by borehole radar logging system
Product, its working mechanism is made by electromagnetic wave and propagates and then detect the discontinuous geology of electromagnetic property in underground with rock stratum
Abnormal, while obtaining high-resolution, can reach the detection range in well week 5～10m, compared to tradition logging method 2～3m
Detection range farther, therefore become the hot topic of research both at home and abroad.
Current most of borehole radar broadly falls into pulse system, but this radar be difficult to take into account high-resolution and
The requirement of remote detection range, and corresponding frequency domain step frequency pulse radar can be accomplished high-resolution and high detection
The requirement of distance, this radar, by launching the little step frequency signal of high-power ultra broadband, does not connects when running into electromagnetic property
During the underground medium continued, its reflection characteristic or transmission characteristic change, and pass through from echo or transmitted waveform the most again
Pulse compression technology extracts target information.This system realizes the location of target by the way of launching antenna and reception antenna group battle array,
In experiment, stratum media is maximum up to 100dB for the attenuation of radar wave, and its input range is very big.
Owing to deep downhole temperature is higher, it requires that device possesses resistance to elevated temperatures；Launch frequency to combine and echo-signal frequency band
The widest, also require that device has wider frequency band range；Down-hole complex environment is to the dynamic range of receiver and sensitivity also
Propose the highest requirement.Receiver processes the significant element of signal as radar system reception, greatly have impact on whole system
The performance of system, it is therefore desirable to design has Larger Dynamic scope and highly sensitive receiver to meet the requirement of radar system.
Summary of the invention
Directional drilling radar receiving antenna signal for step frequency pulse regime needs process, echo-signal excursion
Feature, for realizing Open-closed-loop linear gain span of control controlled, very big and minimum gain stepping, the invention provides greatly
A kind of borehole radar step frequency controllable gain receiver front end.It is used in oil well logging, the ring complicated to tackle down-hole
Border is to the dynamic range of receiver and highly sensitive requirement.
Concrete technical scheme is:
A kind of borehole radar step frequency controllable gain receiver front end, including two pieces of identical circuit board for receiving.Two pieces
Receiving circuit to carry out, the first via directly gathers transmitting signal as reference simultaneously, and that is second tunnel, another road gathers returning of receiving
Ripple signal.
First piece of circuit board includes direct-coupling device, high gain amplifier, step attenuator, frequency mixer and wave filter；Directly
Connecing and be acquired transmitting signal, circuit exports after mixing and filtering at least twice；Because, this road signals collecting and the second road letter
Number collection synchronizes to carry out, so, this road output signal is as the reference signal on the second tunnel the most at last, in order to subsequent treatment
Unit passes through phase bit comparison and Amplitude Ratio relatively to obtain system transter.
Second piece of circuit plate circuit includes amplitude limiter, low-noise amplifier, gainequalizer, at a high speed reception gate-controlled switch, increasing
Benefit amplifier, digital step attenuator, frequency mixer, wave filter and output stage amplifier cascade composition radio frequency link successively；Also wrap
Include single chip control unit, peak detector and power control circuit；And it is consistent with the first circuit mixing and filtering number of times.
Described low-noise amplifier, gainequalizer, amplifier, digital step attenuator and amplifier cascade composition successively
Gain unit.
Described single chip control unit, power control circuit are connected with radio frequency link, control Link State in real time
Gain size i.e. constitutes Open-closed-loop controllable gain control unit AGC；Single chip control unit, according to the size of final output signal
Realize gain step value adjusted control in real time, and provide Open-closed-loop controlled gain control function.
Amplitude limiter to direct wave or significantly signal there is peak clipping effect, described receiver is shielded.
Further, described receiver extracts target information from the frequency-region signal of 100MHZ-1500MHZ, 1MHZ stepping.
Further, described high speed receives gate-controlled switch by Single-chip Controlling so that it is realize receiving and dispatching asynchronous pattern i.e.
Gated pattern, thus, make receiver farthest from the impact of direct wave.
Further, the linear gain span of control-13dB of described gain control unit～90dB, gain step value exists
Between 0.5dB～16dB adjustable.
Further, described power control circuit separates with receiver module as single control module, it is to avoid electromagnetism
Interference.
Further, described borehole radar step frequency controllable gain receiver front end, it is arranged on the glass of 55mm diameter
In steel pipe, and it is filled with phase-change material wherein, has reached whole system and kept the purpose of constant temperature.
The present invention by single chip machine controlling circuit according to the size of final output signal realize gain step value real-time
Adjust and control, and the gain control function that offer Open-closed-loop is controlled.Input signal has been carried out extremely by frequency mixer and filter circuit
Few twice down-converted, makes the IF signal frequency smaller bandwidth finally exported, so instant bandwidth corresponding to receiver is just
The least, the most effectively inhibit the interference of noise, improve the sensitivity of system.In gain control unit, gainequalizer
Use achieves High Gain Flatness PA, and ultimately provides-13dB～95dB linear gain control, and 0.5dB～16dB
Gain stepping.And prepared by the high temperature resistant device all used.
In sum, present invention achieves the asynchronous pattern of transmitting-receiving, High Gain Flatness PA, gain control is convenient ,-13dB～
95dB linear gain scope, and the gain stepping of 0.5dB～16dB, and high temperature resistant.It is applicable to receive signal excursion pole
In big receiver system.
Accompanying drawing explanation
Fig. 1 present configuration schematic diagram；
Fig. 2 embodiment first via system design drawing；
Fig. 3 embodiment the second tunnel system design drawing；
The digital step attenuator structure chart that Fig. 4 embodiment uses.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the present invention is described in further detail.
It is illustrated in figure 2 embodiment first via receiver front end system design drawing.
This road is for being directly acquired transmitting signal, and circuit is to export after twice mixing and filtering and gain amplify.
Because this road signals collecting and the second tunnel signals collecting are Tong Bu carried out, so, this road output signal is as second the most at last
The reference signal on road, in order to subsequent processing units passes through phase bit comparison and Amplitude Ratio relatively to obtain system transter.
It is illustrated in figure 3 embodiment the second road receiver front end system design drawing.Amplitude limiter is the low noise with 0.1db
Limiter diode, excessive signal is played by it cuts cutting edge of a knife or a sword effect, thus protects subsequent conditioning circuit.Receive at a high speed gate-controlled switch,
By receiving the instruction of single chip control unit, complete to receive and dispatch nonsynchronous task, the shadow decreasing direct wave of minimum degree
Ring.
Low-noise amplifier, gainequalizer, prime high gain amplifier, intergrade gain amplifier, numeral stepping decline
Subtract device, the gain elementary cell of output stage amplifier six grades of High Gain Flatness PAs of composition.
The signal received first is amplified, after twice down coversion and Filtering Processing, then by peak by gain elementary cell
Signal after value cymoscope extraction process transfers to single-chip microcomputer to carry out analog-to-digital conversion process, finally according to the signal magnitude pair after processing
Gain unit sends control instruction；Can also directly be controlled, i.e. achieve the AGC control unit that Open-closed-loop is controlled.
Gain elementary cell is the core of this receiver front end, and the actual gain device of gain per stage primitive is respectively
20dB low-noise amplifier, 30dB amplifier, 6 bit digital step attenuators, 20dB amplifier, 6 bit digital step attenuators,
20dB amplifier, LNA and pre-amplifier gain primitive leading directly to and can switch between actual gain device two states, enter
And adjust gain.
The two stage gain primitives respective actual gain device power sources such as low-noise amplifier, prime high gain amplifier are led
On/off is opened two states and is controlled switching by a signal respectively, receives at a high speed gate-controlled switch and is also controlled by a signal, corresponds to
C1, C3, C2, this signal completes the switching between two link channel by controlling one group of corresponding SPDT or spst switch.
Digital step attenuator is the key point of Gain tuning, 6 grades of attenuations be respectively 16dB, 8dB, 4dB, 2dB,
1dB, 0.5dB, the minimal attenuation amount of selection determines the gain stepping of receiver front end, and therefore the receiver front end of the present invention increases
Benefit stepping is adjustable between 0.5dB～16dB.6 control signals that 6 grades of attenuations of digital step attenuator are provided by single-chip microcomputer
Directly control switching, attenuation can be adjusted by combination, and then change the gain of receiver front end.Additionally, numeral stepping
The power supply of attenuator enables position and is also controlled by a control signal, and (another grade of numerical-control attenuator is by C11-C17 to correspond to C4-C10
Control).
Single chip control unit and peak detector together form the AGC gain control circuit of closed loop, and this circuit is permissible
Size according to output signal adjusts the size of gain in time, and this module is also the core of circuit, declines for numeral stepping
Subtract device and select switch to provide control signal, it is achieved the gain control function of whole link.Wherein, the knot of digital step attenuator
As shown in Figure 4, the most whole radio frequency link needs 16 gain control signals to structure altogether, needs 14 binary gain controls accordingly
Signal processed；2 binary switch control signals.
This receiver front end outside input+12V DC, inside chip needs+5V DC ,-5V DC ,+3.3V, therefore designs
Corresponding+12V be converted to+5V ,-5V, DC-DC conversion circuit, with the DC-DC conversion circuit that+5V is converted to+3.3V.
The present embodiment achieves-13dB～90dB linear gain span of control, has both met the decay needs of big signal, full again
The amplification demand of foot small-signal.
Claims (6)
1. a borehole radar step frequency controllable gain receiver front end, including two pieces of identical circuit board for receiving, its feature
Be: two pieces receive circuit carry out simultaneously, the first via directly gather transmitting signal as reference, that is second tunnel, another road gather connect
The echo-signal received；
First piece of circuit board includes direct-coupling device, high gain amplifier, step attenuator, frequency mixer and wave filter；The most right
Transmitting signal is acquired, and circuit exports after mixing and filtering at least twice；This road output signal is believed as the reference on the second tunnel
Number, relatively obtain system transter for subsequent processing units by phase bit comparison and Amplitude Ratio；
Second piece of circuit plate circuit include amplitude limiter, input stage low-noise amplifier, gainequalizer, at a high speed receive gate-controlled switch,
Gain amplifier, digital step attenuator, frequency mixer, wave filter and output stage amplifier cascade composition radio frequency link successively；Also
Including single chip control unit, peak detector and power control circuit；And it is consistent with first piece of circuit mixing and filtering number of times；
Described low-noise amplifier, gainequalizer, amplifier, digital step attenuator and amplifier cascade composition gain successively
Unit；
Described single chip control unit, controls to receive at a high speed gate-controlled switch so that it is realize transmitting-receiving asynchronous pattern i.e. gated mould
Formula；
Described single chip control unit, power control circuit are connected with radio frequency link, and Link State is carried out real-time gain control
I.e. constitute Open-closed-loop controllable gain control unit；Single chip control unit, realizes gain according to the size of final output signal
Step value adjust control in real time, and provide Open-closed-loop controlled gain control function.
2. borehole radar step frequency controllable gain receiver front end as claimed in claim 1, it is characterised in that: receiver front end
Target information is extracted from the frequency domain echo signal of 100MHZ-1500MHZ, 1MHZ stepping.
3. borehole radar step frequency controllable gain receiver front end as claimed in claim 1, it is characterised in that: described gain control
Linear gain span of control-the 13dB of unit processed～90dB, gain step value 0.5dB～16dB.
4. borehole radar step frequency controllable gain receiver front end as claimed in claim 1, it is characterised in that: described power supply control
Unit processed separates with receiver module as single control module.
5. borehole radar step frequency controllable gain receiver front end as claimed in claim 1, it is characterised in that: it is arranged on 55mm
In the glass reinforced plastic pipe of diameter, and it is filled with phase-change material wherein.
6. borehole radar step frequency controllable gain receiver front end as claimed in claim 1, it is characterised in that: it is used in oil
In well logging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610621898.3A CN106291479B (en) | 2016-08-02 | 2016-08-02 | A kind of borehole radar step frequency controllable gain receiver front end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610621898.3A CN106291479B (en) | 2016-08-02 | 2016-08-02 | A kind of borehole radar step frequency controllable gain receiver front end |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106291479A true CN106291479A (en) | 2017-01-04 |
| CN106291479B CN106291479B (en) | 2019-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610621898.3A Expired - Fee Related CN106291479B (en) | 2016-08-02 | 2016-08-02 | A kind of borehole radar step frequency controllable gain receiver front end |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194298A (en) * | 2018-08-31 | 2019-01-11 | 上海迦美信芯通讯技术有限公司 | Programmable gain amplifier amplifier and navigation neceiver |
| CN110794372A (en) * | 2019-11-12 | 2020-02-14 | 长沙莫之比智能科技有限公司 | Millimeter wave radar and unmanned aerial vehicle multi-target height measurement method based on millimeter wave radar |
| CN111478705A (en) * | 2019-12-31 | 2020-07-31 | 南京中科晶上通信技术有限公司 | Gain control method, device and circuit based on receiver and receiver |
| CN114039566A (en) * | 2022-01-07 | 2022-02-11 | 中国人民解放军海军工程大学 | Anti-blocking interference automatic gain control circuit and control method |
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| CN204244189U (en) * | 2014-12-17 | 2015-04-01 | 常州国光数据通信有限公司 | A kind of wide-band amplifier being suitable for detection ionospheric echo and detecting |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1168639A3 (en) * | 2000-06-28 | 2004-01-02 | Northrop Grumman Corporation | A receiver including low noise amplifier and frequency down-converter for a wireless telecommunication system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194298A (en) * | 2018-08-31 | 2019-01-11 | 上海迦美信芯通讯技术有限公司 | Programmable gain amplifier amplifier and navigation neceiver |
| CN110794372A (en) * | 2019-11-12 | 2020-02-14 | 长沙莫之比智能科技有限公司 | Millimeter wave radar and unmanned aerial vehicle multi-target height measurement method based on millimeter wave radar |
| CN111478705A (en) * | 2019-12-31 | 2020-07-31 | 南京中科晶上通信技术有限公司 | Gain control method, device and circuit based on receiver and receiver |
| CN111478705B (en) * | 2019-12-31 | 2023-07-04 | 南京中科晶上通信技术有限公司 | Gain control method, device and circuit based on receiver and receiver |
| CN114039566A (en) * | 2022-01-07 | 2022-02-11 | 中国人民解放军海军工程大学 | Anti-blocking interference automatic gain control circuit and control method |
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| CN106291479B (en) | 2019-04-05 |
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Granted publication date: 20190405 Termination date: 20210802 |