CN105403866A - Real-time large dynamic synthetic aperture radar receiver - Google Patents
Real-time large dynamic synthetic aperture radar receiver Download PDFInfo
- Publication number
- CN105403866A CN105403866A CN201510826027.0A CN201510826027A CN105403866A CN 105403866 A CN105403866 A CN 105403866A CN 201510826027 A CN201510826027 A CN 201510826027A CN 105403866 A CN105403866 A CN 105403866A
- Authority
- CN
- China
- Prior art keywords
- output terminal
- inductance
- input end
- real
- frequency receiver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention relates to a real-time large dynamic synthetic aperture radar receiver comprising a receiving front end for receiving an input echo signal. The output terminal of the receiving front end is connected with an input terminal of a power divider. The power divider has duplex output one path of output is sent to a main path intermediate-frequency receiver for carrying out amplitude-phase high-fidelity receiving on a signal and then the other output is connected to an auxiliary path intermediate-frequency receiver for carrying out amplitude detection and determination on the signal. The auxiliary path intermediate-frequency receiver outputs amplitude adjustment control information to the main path intermediate-frequency receiver. According to the invention, the auxiliary path intermediate-frequency receiver completes amplitude detection and determination within a time delay range of a main path time delay device and the main path intermediate-frequency receiver is controlled to control a gain amplifier to realize real-time gain control, thereby realizing real-time large dynamic reception. Therefore, large dynamic amplitude saturation can be processed in real time and the fidelity of the received signal and image quality of the radar system can be improved.
Description
Technical field
The present invention relates to synthetic-aperture radar receiver technical field, especially a kind of Larger Dynamic synthetic-aperture radar receiver in real time.
Background technology
Synthetic-aperture radar receiver must carry out width to broadband signal and read the reception of phase place fidelity, and therefore synthetic-aperture radar receiver bandwidth is comparatively large, and transient behavior is less.Conventional synthetic-aperture radar receiver adopts single channel closed loop gain control method to carry out dynamic expansion for improving dynamic range, namely amplitude size is judged by rear class data processing, feed back to the gain controller of receiver again, therefore certain time delay is had, workbench due to synthetic-aperture radar is motion platform, as aircraft, satellite, guided missile etc., and many times the leap detection of a target is disposable, when echo strength big rise and fall, when gain controls to put in place, strong echoed signal may have been pass by, not reproducible, therefore the dynamic expansion of this non real-time amplitude gain control realization real-time Larger Dynamic that will synthetic-aperture radar receiver cannot be realized, have a strong impact on the quality of reception of signal.
Summary of the invention
The object of the present invention is to provide one can process Larger Dynamic amplitude in real time saturated, improve the fidelity of radar system Received signal strength and the real-time Larger Dynamic synthetic-aperture radar receiver of image quality.
For achieving the above object, present invention employs following technical scheme: a kind of Larger Dynamic synthetic-aperture radar receiver in real time, comprise the receiving front-end for receiving input echoed signal, its output terminal is connected with the input end of power splitter, power splitter divides two-way to export, one tunnel exports the main road intermediate-frequency receiver received for carrying out width phase fidelity to signal to, another road exports the bypass intermediate-frequency receiver for carrying out amplitude detection and judgement to signal to, and described bypass intermediate-frequency receiver output amplitude regulable control information is to main road intermediate-frequency receiver.
Described main road intermediate-frequency receiver receives rear end by main road chronotron, controllable gain amplifier and main road and forms, described bypass intermediate-frequency receiver is made up of bypass log-magnitude testing circuit, A/D transducer and amplitude decision processor, first output terminal of described power splitter is connected with the input end of main road chronotron, second output terminal of power splitter is connected with the input end of bypass log-magnitude testing circuit, the output terminal of main road chronotron is connected with the input end of controllable gain amplifier, and the input end that output terminal and the main road of controllable gain amplifier receive rear end is connected; The output terminal of described bypass log-magnitude testing circuit is connected with the input end of A/D transducer, and the output terminal of A/D transducer is connected with the input end of amplitude decision processor, and the described output terminal of amplitude decision processor is connected with the input end of controllable gain amplifier.
Described receiving front-end is made up of low noise amplifier U1, frequency mixer and bandpass filter, the input end of described low noise amplifier U1 receives the high frequency echo signal of input, the output terminal of low noise amplifier U1 is connected with the first input end of frequency mixer, second input end of frequency mixer receives local oscillation signal, the output terminal of frequency mixer is connected with the input end of bandpass filter, and the output terminal of bandpass filter is connected with the input end of power splitter.
Described power splitter is made up of inductance L 1, inductance L 2, inductance L 3 and inductance L 4, one end of described inductance L 1 is as the input end of power splitter, the other end of inductance L 1 is connected with one end of resistance R1, inductance L 3 respectively, the other end of inductance L 3 is as the first output terminal of power splitter, the other end of resistance R1 is connected with one end of inductance L 2, inductance L 4 respectively, the other end ground connection of inductance L 2, the other end of inductance L 4 is as the second output terminal of power splitter.
Described bypass log-magnitude testing circuit is by inductance L 5, resistance R2, resistance R3, logarithmic amplifier U2 and detector diode D1 forms, described inductance L 5 and resistance R2 parallel connection, one termination power VCC of this parallel connected end, the other end of this parallel connected end is connected with the offset side of logarithmic amplifier U2, the input end of described logarithmic amplifier U2 is as the input end of bypass log-magnitude testing circuit, the output terminal of logarithmic amplifier U2 respectively with one end of resistance R3, the anode of detector diode D1 is connected, the other end of resistance R3 is as the output terminal of bypass log-magnitude testing circuit, the plus earth of detector diode D1.
As shown from the above technical solution, advantage of the present invention is as follows: first, the present invention adopts main road intermediate-frequency receiver, the process of bypass intermediate-frequency receiver Receiving, overcomes conventional synthetic-aperture radar receiver and adopts single channel closed loop gain control realization Larger Dynamic and the control latency issue that produces; Second, the present invention completes amplitude detection and judgement by bypass intermediate-frequency receiver in main road chronotron reference time delay, and control main road intermediate-frequency receiver controllable gain amplifier realize real-time gain control, realize real-time Larger Dynamic to receive, Larger Dynamic amplitude can be processed in real time saturated, improving fidelity and the image quality of radar system Received signal strength, is one of gordian technique in synthetic-aperture radar.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention;
Fig. 2 is the schematic block circuit diagram of receiving front-end in the present invention;
Fig. 3 is the schematic block circuit diagram of power splitter in the present invention;
Fig. 4 is the schematic block circuit diagram of bypass log-magnitude testing circuit in the present invention.
Embodiment
As shown in Figure 1, a kind of Larger Dynamic synthetic-aperture radar receiver in real time, comprise the receiving front-end 3 for receiving input echoed signal, its output terminal is connected with the input end of power splitter 4, power splitter 4 points of two-way export, one tunnel exports the main road intermediate-frequency receiver 1 received for carrying out width phase fidelity to signal to, and another road exports the bypass intermediate-frequency receiver 2 for carrying out amplitude detection and judgement to signal to, and described bypass intermediate-frequency receiver 2 output amplitude regulable control information is to main road intermediate-frequency receiver 1.
As shown in Figure 1, described main road intermediate-frequency receiver 1 is by main road chronotron, controllable gain amplifier and main road receive rear end composition, described bypass intermediate-frequency receiver 2 is by bypass log-magnitude testing circuit 5, A/D transducer and amplitude decision processor composition, first output terminal of described power splitter 4 is connected with the input end of main road chronotron, second output terminal of power splitter 4 is connected with the input end of bypass log-magnitude testing circuit 5, the output terminal of main road chronotron is connected with the input end of controllable gain amplifier, the input end that output terminal and the main road of controllable gain amplifier receive rear end is connected, the output terminal of described bypass log-magnitude testing circuit 5 is connected with the input end of A/D transducer, and the output terminal of A/D transducer is connected with the input end of amplitude decision processor, and the described output terminal of amplitude decision processor is connected with the input end of controllable gain amplifier.In main road chronotron reference time delay, complete amplitude detection and judgement by bypass intermediate-frequency receiver 2, and the controllable gain amplifier controlling main road intermediate-frequency receiver 1 realizes real-time gain control, realize real-time Larger Dynamic and receive.The analog voltage information quantization of input is output into numerical information by A/D transducer.The data of input and inner logic gate judge by amplitude decision processor, export the gain controlling information of main receiving path.
As shown in Figure 2, described receiving front-end 3 is made up of low noise amplifier U1, frequency mixer 6 and bandpass filter 7, the input end of described low noise amplifier U1 receives the high frequency echo signal of input, the output terminal of low noise amplifier U1 is connected with the first input end of frequency mixer 6, second input end of frequency mixer 6 receives local oscillation signal, the output terminal of frequency mixer 6 is connected with the input end of bandpass filter 7, and the output terminal of bandpass filter 7 is connected with the input end of power splitter 4.The function of receiving front-end 3 is by high frequency echo Signal reception, the power of small-signal is effectively amplified by low noise amplifier U1, signal carries out mixing by frequency mixer 6 and local oscillation signal again and obtains the intermediate-freuqncy signal after frequency spectrum shift, takes out useful signal send into rear end by bandpass filter 7.
As shown in Figure 3, described power splitter 4 is made up of inductance L 1, inductance L 2, inductance L 3 and inductance L 4, one end of described inductance L 1 is as the input end of power splitter 4, the other end of inductance L 1 is connected with one end of resistance R1, inductance L 3 respectively, the other end of inductance L 3 is as the first output terminal of power splitter 4, the other end of resistance R1 is connected with one end of inductance L 2, inductance L 4 respectively, the other end ground connection of inductance L 2, and the other end of inductance L 4 is as the second output terminal of power splitter 4.Distribute equiphase power by input signal by inductance and export two-way constant power signal, sending into main reception and auxiliary reception branch road respectively.
As shown in Figure 4, described bypass log-magnitude testing circuit 5 is by inductance L 5, resistance R2, resistance R3, logarithmic amplifier U2 and detector diode D1 forms, described inductance L 5 and resistance R2 parallel connection, one termination power VCC of this parallel connected end, the other end of this parallel connected end is connected with the offset side of logarithmic amplifier U2, the input end of described logarithmic amplifier U2 is as the input end of bypass log-magnitude testing circuit 5, the output terminal of logarithmic amplifier U2 respectively with one end of resistance R3, the anode of detector diode D1 is connected, the other end of resistance R3 is as the output terminal of bypass log-magnitude testing circuit 5, the plus earth of detector diode D1.Input signal is amplified by a logarithmic amplifier U2, it is advantageous that and amplify the dynamic by exponential compression of its amplitude rear, the data bits of late-class circuit can be alleviated.The envelope information of range signal is extracted into information of voltage by detector diode D1 and exports by the signal after amplification.
In sum, the present invention adopts main road intermediate-frequency receiver 1, the process of bypass intermediate-frequency receiver 2 Receiving, overcomes conventional synthetic-aperture radar receiver and adopts single channel closed loop gain control realization Larger Dynamic and the control latency issue that produces; The present invention completes amplitude detection and judgement by bypass intermediate-frequency receiver 2 in main road chronotron reference time delay, and control main road intermediate-frequency receiver 1 controllable gain amplifier realize real-time gain control, realize real-time Larger Dynamic to receive, Larger Dynamic amplitude can be processed in real time saturated, improve fidelity and the image quality of radar system Received signal strength.
Claims (5)
1. a real-time Larger Dynamic synthetic-aperture radar receiver, it is characterized in that: comprise the receiving front-end (3) for receiving input echoed signal, its output terminal is connected with the input end of power splitter (4), power splitter (4) point two-way exports, one tunnel exports the main road intermediate-frequency receiver (1) received for carrying out width phase fidelity to signal to, another road exports the bypass intermediate-frequency receiver (2) for carrying out amplitude detection and judgement to signal to, and described bypass intermediate-frequency receiver (2) output amplitude regulable control information is to main road intermediate-frequency receiver (1).
2. real-time Larger Dynamic synthetic-aperture radar receiver according to claim 1, it is characterized in that: described main road intermediate-frequency receiver (1) is by main road chronotron, controllable gain amplifier and main road receive rear end composition, described bypass intermediate-frequency receiver (2) is by bypass log-magnitude testing circuit (5), A/D transducer and amplitude decision processor composition, first output terminal of described power splitter (4) is connected with the input end of main road chronotron, second output terminal of power splitter (4) is connected with the input end of bypass log-magnitude testing circuit (5), the output terminal of main road chronotron is connected with the input end of controllable gain amplifier, the input end that output terminal and the main road of controllable gain amplifier receive rear end is connected, the output terminal of described bypass log-magnitude testing circuit (5) is connected with the input end of A/D transducer, the output terminal of A/D transducer is connected with the input end of amplitude decision processor, and the described output terminal of amplitude decision processor is connected with the input end of controllable gain amplifier.
3. real-time Larger Dynamic synthetic-aperture radar receiver according to claim 1, it is characterized in that: described receiving front-end (3) is by low noise amplifier U1, frequency mixer (6) and bandpass filter (7) composition, the input end of described low noise amplifier U1 receives the high frequency echo signal of input, the output terminal of low noise amplifier U1 is connected with the first input end of frequency mixer (6), second input end of frequency mixer (6) receives local oscillation signal, the output terminal of frequency mixer (6) is connected with the input end of bandpass filter (7), the output terminal of bandpass filter (7) is connected with the input end of power splitter (4).
4. real-time Larger Dynamic synthetic-aperture radar receiver according to claim 1, it is characterized in that: described power splitter (4) is by inductance L 1, inductance L 2, inductance L 3 and inductance L 4 form, one end of described inductance L 1 is as the input end of power splitter (4), the other end of inductance L 1 respectively with resistance R1, one end of inductance L 3 is connected, the other end of inductance L 3 is as the first output terminal of power splitter (4), the other end of resistance R1 respectively with inductance L 2, one end of inductance L 4 is connected, the other end ground connection of inductance L 2, the other end of inductance L 4 is as the second output terminal of power splitter (4).
5. real-time Larger Dynamic synthetic-aperture radar receiver according to claim 1, it is characterized in that: described bypass log-magnitude testing circuit (5) is by inductance L 5, resistance R2, resistance R3, logarithmic amplifier U2 and detector diode D1 forms, described inductance L 5 and resistance R2 parallel connection, one termination power VCC of this parallel connected end, the other end of this parallel connected end is connected with the offset side of logarithmic amplifier U2, the input end of described logarithmic amplifier U2 is as the input end of bypass log-magnitude testing circuit (5), the output terminal of logarithmic amplifier U2 respectively with one end of resistance R3, the anode of detector diode D1 is connected, the other end of resistance R3 is as the output terminal of bypass log-magnitude testing circuit (5), the plus earth of detector diode D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510826027.0A CN105403866A (en) | 2015-11-25 | 2015-11-25 | Real-time large dynamic synthetic aperture radar receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510826027.0A CN105403866A (en) | 2015-11-25 | 2015-11-25 | Real-time large dynamic synthetic aperture radar receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105403866A true CN105403866A (en) | 2016-03-16 |
Family
ID=55469467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510826027.0A Pending CN105403866A (en) | 2015-11-25 | 2015-11-25 | Real-time large dynamic synthetic aperture radar receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105403866A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518925A (en) * | 2019-08-29 | 2019-11-29 | 成都锦江电子***工程有限公司 | A kind of high dynamic response signal receiving channel |
| CN111352088A (en) * | 2018-12-21 | 2020-06-30 | 余姚舜宇智能光学技术有限公司 | Doppler echo signal processing method for laser Doppler vibration meter and circuit system thereof |
| CN111865242A (en) * | 2020-07-21 | 2020-10-30 | 无锡威孚高科技集团股份有限公司 | Radar gain closed-loop control method, device and system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1516493A (en) * | 2003-01-10 | 2004-07-28 | 深圳市中兴通讯股份有限公司上海第二 | Power amplifier linearization method and linear power amplifier device |
| CN102262221A (en) * | 2011-04-28 | 2011-11-30 | 中国电子科技集团公司第三十八研究所 | X-band synthetic aperture radar/ground moving target indication (SAR/GMTI) integrated multi-mode receiving channel |
| CN103592640A (en) * | 2013-11-20 | 2014-02-19 | 中国船舶重工集团公司第七二四研究所 | Automatic high-precision calibration method of meteorological radar send-receive channel gains |
| CN203813771U (en) * | 2014-04-21 | 2014-09-03 | 常州国光数据通信有限公司 | Large dynamic-range digital channelized receiver based on FPGA |
| US20150285900A1 (en) * | 2014-04-02 | 2015-10-08 | Vayyar Imaging Ltd | Device system and method for dynamic signal measurement range scaling |
| CN205139362U (en) * | 2015-11-25 | 2016-04-06 | 中国电子科技集团公司第三十八研究所 | Real -time big dynamic synthetic aperture radar receiver |
-
2015
- 2015-11-25 CN CN201510826027.0A patent/CN105403866A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1516493A (en) * | 2003-01-10 | 2004-07-28 | 深圳市中兴通讯股份有限公司上海第二 | Power amplifier linearization method and linear power amplifier device |
| CN102262221A (en) * | 2011-04-28 | 2011-11-30 | 中国电子科技集团公司第三十八研究所 | X-band synthetic aperture radar/ground moving target indication (SAR/GMTI) integrated multi-mode receiving channel |
| CN103592640A (en) * | 2013-11-20 | 2014-02-19 | 中国船舶重工集团公司第七二四研究所 | Automatic high-precision calibration method of meteorological radar send-receive channel gains |
| US20150285900A1 (en) * | 2014-04-02 | 2015-10-08 | Vayyar Imaging Ltd | Device system and method for dynamic signal measurement range scaling |
| CN203813771U (en) * | 2014-04-21 | 2014-09-03 | 常州国光数据通信有限公司 | Large dynamic-range digital channelized receiver based on FPGA |
| CN205139362U (en) * | 2015-11-25 | 2016-04-06 | 中国电子科技集团公司第三十八研究所 | Real -time big dynamic synthetic aperture radar receiver |
Non-Patent Citations (1)
| Title |
|---|
| 李嘉: "C波段接收机关键技术的研究", 《中国优秀硕士学位论文数据库信息科技辑》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111352088A (en) * | 2018-12-21 | 2020-06-30 | 余姚舜宇智能光学技术有限公司 | Doppler echo signal processing method for laser Doppler vibration meter and circuit system thereof |
| CN110518925A (en) * | 2019-08-29 | 2019-11-29 | 成都锦江电子***工程有限公司 | A kind of high dynamic response signal receiving channel |
| CN110518925B (en) * | 2019-08-29 | 2024-04-09 | 成都锦江电子***工程有限公司 | High dynamic response signal receiving channel |
| CN111865242A (en) * | 2020-07-21 | 2020-10-30 | 无锡威孚高科技集团股份有限公司 | Radar gain closed-loop control method, device and system |
| CN111865242B (en) * | 2020-07-21 | 2024-04-05 | 无锡威孚高科技集团股份有限公司 | Radar gain closed-loop control method, device and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105403866A (en) | Real-time large dynamic synthetic aperture radar receiver | |
| EP1929327B1 (en) | Signal acquisition system and method for ultra-wideband (uwb) radar | |
| CN109412628B (en) | X-waveband broadband multi-beam digital receiving system and signal processing method thereof | |
| CN102780535A (en) | Intermediate-frequency detection based vector network analyzer power control method | |
| CN106226741A (en) | TR assembly is utilized to obtain the method and system of intermediate frequency controllable signal | |
| CN109150215A (en) | Numerical model analysis adaptive interference cancellation device | |
| CN205139362U (en) | Real -time big dynamic synthetic aperture radar receiver | |
| CN204190712U (en) | A kind of ultrashort wave radio set automatic gain control circuit | |
| CN103728620B (en) | A kind of polarization sensitive synthetic aperture radar system based on transmitting-receiving ALT pulse group | |
| CN103513237A (en) | Broadband coherent polar region deep-layer ice penetrating radar system | |
| CN110398739A (en) | A kind of millimeter wave cloud detection radar system | |
| CN101650420B (en) | Intermediate frequency (IF) signal amplifier for navigation radar | |
| CN104242970B (en) | A kind of multichannel medium-frequency pulse automatic gain attenuation control circuit | |
| CN102778677A (en) | Long-distance pulse compression and short-distance pulse envelope detection delay measurement combined distance measuring method | |
| US10801878B2 (en) | Radar fill level measurement device having a self-testing function | |
| CN114527443A (en) | Ka-band DBF-SAR real-time processing system and method | |
| CN201479082U (en) | Intermediate frequency signal amplifier of navigation radar | |
| CN104779969B (en) | A kind of full duplex system with high dynamic receiver and its using method | |
| CN106788792A (en) | A kind of wideband multi-channel Poewr control method for being applied to vector network analyzer | |
| CN209486296U (en) | A kind of millimeter wave cloud detection radar system | |
| CN104931962A (en) | Ground penetrating radar utilizing ultra wide band orthogonal frequency division multiplexing signals | |
| CN109407058B (en) | Automatic gain control receiving assembly | |
| CN204177970U (en) | Beidou navigation anti-interference antenna radio frequency component | |
| CN218850761U (en) | Radio frequency receiver based on single-bit frequency measurement | |
| US8325083B2 (en) | Radar apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160316 |