CN104330794A - SAR echo simulator synchronization device and synchronization method - Google Patents
SAR echo simulator synchronization device and synchronization method Download PDFInfo
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- CN104330794A CN104330794A CN201410538200.2A CN201410538200A CN104330794A CN 104330794 A CN104330794 A CN 104330794A CN 201410538200 A CN201410538200 A CN 201410538200A CN 104330794 A CN104330794 A CN 104330794A
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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
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
-
- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
-
- 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
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
- G01S7/4082—Means for monitoring or calibrating by simulation of echoes using externally generated reference signals, e.g. via remote reflector or transponder
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- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses an SAR echo simulator synchronization device. When a mode switch selection circuit is switched on, a clock signal is output to the echo simulator synchronization device with use of the clock benchmark of a tested SAR, and phase locking is carried out to obtain an ideal reference signal fully synchronous with the tested SAR so as to achieve an external synchronization function; and when the clock benchmark of the tested SAR is closed by the mode switch selection circuit, the device can be automatically switched to an internal synchronization mode so as to achieve an internal synchronization function. The invention further discloses an SAR echo simulator synchronization method. Full-state test on the internal and external synchronization modes of the tested SAR can be simultaneously realized. Moreover, line connection is simple, operation is quick and the two modes can be tested with one line connection.
Description
Technical field
The invention belongs to synthetic-aperture radar (SAR) technical field, particularly relate to a kind of synchronous device and synchronous method of SAR echo simulator.
Background technology
The principle of work of synthetic-aperture radar relies on relative motion between radar and target to reach pulse accumulation, thus realize high resolution imaging, and obtain SAR experimental data needs to build a set of huge, complicated and expensive equipment.SAR echo simulator with actual measurement or ideal data for prototype, attitude information thereon in additional carrier flight course, can radar receives in Reality simulation situation echoed signal, realize the nearly matter emulation to SAR system, thus shorten the lead time of SAR, significantly reduce development cost and developing risk.So in the process of development SAR, Echo Signal Simulator is indispensable equipment, and it produces various echoed signal in a flexible way, contributes to the ground debugging of radar, have important meaning to its research, design, Performance Evaluation etc.
The research of current SAR original echo simulation mainly concentrates on rear end imaging simulation, fast algorithm under certain approximate condition, mainly comprises analogy method that time domain simulation method, frequency domain analogue method, time domain and frequency domain combine, analogy method etc. based on the inverse process of imaging algorithm.In order to the nearly matter emulation of the total state realizing SAR system, need a set ofly to integrate digital baseband, Analog Baseband, intermediate frequency simulation and the analogue echoes system of radio frequency analog.The important foundation of synthetic aperture radar image-forming is exactly coherent pulse signalf, and namely in system, all digital dock and simulating signal are all from same reference data, and after analogue echoes system introduces Transmit Receive Unit, its coherent pulse signalf and synchronism just seem important all the more.Can how to realize the synchronous of all signals between analogue echoes system and radar equipment to be measured, be the key guaranteeing realize total state test SAR system properties.
For can the echo simulator of total state testing SA R, there be two kinds of methods of synchronization:
Inter-sync: echo simulator, according to the reference source of self, produces echo simulator and all clock signals needed for tested SAR;
Outer synchronous: echo simulator, according to the clock reference of tested SAR, produces the clock signal needed for echo simulator self.
These two kinds of simultaneous techniquess all can realize the synchronizing function of tested SAR and echo simulator, difference be whether by tested SAR for echo simulator provides reference source.In fact, single a kind of synchronous mode cannot the tested SAR performance of full test, the index test of especially tested SAR radio-frequency system, in the urgent need to integrating the test macro of two kinds of synchronous modes, isolate the performance index of the frequency synthesizer of tested SAR, current industry does not still have analogue echoes equipment synchronous inside and outside a set of can simultaneously realization.
Summary of the invention
In order to overcome existing SAR analogue echoes equipment under total state with the deficiency of SAR device synchronization to be measured, the invention provides a kind of SAR echo simulator synchronous device and synchronous method, to realize the inside and outside two kinds of synchronizing functions with Devices to test simultaneously.
Therefore, as first aspect of the present invention, the invention provides a kind of SAR echo simulator synchronous device, comprising:
Mode switch selection circuit 1, for selecting the reference clock signal whether receiving tested SAR, when its conducting, the reference clock signal access synchronous device of tested SAR; When it turns off, the reference clock signal of tested SAR disconnects;
Phase-locked crystal oscillating circuit 2, be connected with described mode switch selection circuit 1 and echo simulator, when 1 conducting of described mode switch selection circuit, described phase-locked crystal oscillating circuit 2, as phase-locked loop circuit, outputs to described echo simulator by phase-locked for the clock reference of tested SAR; When described mode switch selection circuit 1 turns off, described phase-locked self crystal oscillator of crystal oscillating circuit 2 outputs to described echo simulator as with reference to source.
Wherein, described phase-locked crystal oscillating circuit 2 comprises phase detector PD, loop filter LF, crystal oscillator XO and 1/N frequency divider further, wherein phase detector PD, loop filter LF, crystal oscillator XO connect successively, and 1/N frequency divider is positioned at from crystal oscillator XO to the backfeed loop of phase detector PD.
Wherein, described crystal oscillator XO is VCXO VCXO.
Wherein, described SAR echo simulator synchronous device also comprises:
REF clock monitor circuit 3, for the input of mode switch selection circuit 1 output terminal, and outputs to power supply and supervisory circuit 5 by result V0; And
Power supply and supervisory circuit 5 for monitoring telltable clock signal correctness, and are each circuit with stable voltage.
Wherein, described SAR echo simulator synchronous device also comprises: RF clock monitor circuit 4, for the input of phase-locked crystal oscillating circuit 2 output terminal, and result V1 is outputted to power supply and supervisory circuit 5.
Wherein, the signal detecting result that described power supply and supervisory circuit 5 input based on described REF clock monitor circuit 3 and RF clock monitor circuit 4, in conjunction with steering order, utilize synchronous regime truth table whether normal to judge the synchronism of described SAR echo simulator synchronous device.
As another aspect of the present invention, present invention also offers a kind of SAR echo simulator synchronous method, comprise the steps:
Select current operation mode,
When being operated in External synchronization mode, mode switch selection circuit 1 is placed in conducting state, now phase-locked crystal oscillating circuit 2 receives the clock reference signal that mode switch selection circuit 1 exports, quick realization is by the stabilization process capturing locking, export corresponding reference frequency to echo simulator source for referencial use, realize outer synchronizing function;
When being operated in inter-sync pattern, mode switch selection circuit 1 is placed in off state, synchronous device and extraneous incoming frequency have nothing to do, described phase-locked crystal oscillating circuit 2 self has signal output function, utilize described phase-locked crystal oscillating circuit 2 to export high stable reference signal to echo simulator source for referencial use, realize inter-sync function.
Wherein, described phase-locked crystal oscillating circuit 2 comprises phase detector PD, loop filter LF, crystal oscillator XO and 1/N frequency divider further, wherein phase detector PD, loop filter LF, crystal oscillator XO connect successively, and 1/N frequency divider is positioned at from crystal oscillator XO to the backfeed loop of phase detector PD.
Wherein, described crystal oscillator XO is VCXO VCXO.
Described SAR echo simulator synchronous method also comprises the following steps:
The signal of REF clock monitor circuit 3 pairs of mode switch selection circuit 1 output terminals detects, and result V0 is outputted to power supply and supervisory circuit 5;
The signal of RF clock monitor circuit 4 to phase-locked crystal oscillating circuit 2 output terminal detects, and result V1 is outputted to power supply and supervisory circuit 5;
Whether the signal detecting result that described power supply and supervisory circuit 5 input based on described REF clock monitor circuit 3 and RF clock monitor circuit 4, in conjunction with steering order, utilize synchronous regime truth table normal to judge the synchronism of described SAR echo simulator synchronous device.
Known by technique scheme, the synchronous device of SAR echo simulator of the present invention and synchronous method are owing to adopting phase-locked crystal oscillating circuit, phase-locked loop circuit effect is played when there being outside source, and can using self crystal oscillator as exporting with reference to source when there is no outside source, therefore by means of a mode switch selection circuit, the total state test tested SAR being carried out to inside and outside two kinds of synchronous modes can be realized simultaneously; And line is simple, and swift to operate, one time line can test two kinds of patterns.
Accompanying drawing explanation
Fig. 1 is the line graph of SAR echo simulator synchronous device of the present invention and system;
Fig. 2 is the system construction drawing of SAR echo simulator synchronous device of the present invention;
Fig. 3 is the principle assumption diagram of SAR echo simulator synchronous device of the present invention;
Fig. 4 is the interface schema of SAR echo simulator synchronous device VCXO VCXO of the present invention;
Fig. 5 is the workflow diagram of SAR echo simulator synchronous device of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is illustrated.It is noted that described embodiment is only considered as the object illustrated, instead of limitation of the present invention.
Fig. 1 represents SAR echo simulator synchronous device line graph.Fig. 2 represents the system construction drawing of this synchronous device, comprises following components: mode switch selection circuit 1, phase-locked crystal oscillating circuit PLXO2, REF clock monitor circuit 3, RF clock monitor circuit 4 and power supply and supervisory circuit 5, respectively in detail it is described in detail below.
After each circuit of the present invention powers on, mode switch selection circuit 1 is in order to select the reference clock signal whether receiving tested SAR, this circuit turn-on, and the reference clock signal of tested SAR can enter synchronous device, enters follow-up simulation process link; This circuit shut-down, the reference clock signal of tested SAR disconnects, and this synchronous device enters inter-sync pattern automatically, is exported, as the reference clock of echo simulator as with reference to source by self crystal oscillator of phase-locked crystal oscillating circuit.
Phase-locked crystal oscillating circuit PLXO2 of the present invention has automatic switching function, when receiving the clock signal that mode switch selection circuit 1 exports, being operated in External synchronization mode, making outer input clock synchronous with self output clock by phase-locked loop.When mode switch selection circuit 1 no signal exports, phase-locked crystal oscillating circuit transfers inter-sync pattern automatically to, namely himself has signal output function, can be used as the high stable reference source of echo simulator.Composition graphs 3 can be seen, as a preferred embodiment of the present invention, phase-locked crystal oscillating circuit 2 of the present invention comprises phase detector PD, loop filter LF, VCXO VCXO and 1/N frequency divider, when mode switch selection circuit 1 conducting, when being operated in External synchronization mode, PD, LF and VCXO form phaselocked loop crystal oscillating circuit, make outer input clock synchronous with self output clock; When mode switch selection circuit 1 turns off, when being operated in inter-sync pattern, the VCXO VCXO of phase-locked crystal oscillating circuit can export Low phase noise, high stable frequency signal, as the reference clock of echo simulator.
Composition graphs 4 can be seen, VCXO VCXO in phase-locked crystal oscillating circuit 2 of the present invention comprises voltage-controlled voltage (EFC) input, frequency signal exports and the port such as supply voltage input, is connected successively with loop filter LF, 1/N frequency divider of phase-locked crystal oscillating circuit and power supply and supervisory circuit.VCXO VCXO is voltage-controlled constant temperature quartz oscillator, and its signal exported has the advantages that phase noise is low, degree of stability is high; Under the effect of control voltage, its output frequency size is variable, has circuit conditioning function.Certainly, the VCXO VCXO in the present invention also can adopt common crystals XO to replace.
REF clock monitor circuit 3 of the present invention, RF clock monitor circuit 4 have signal monitoring function, as the subsidiary discriminant means of signal correctness, after steering order sends, judge that whether system reference work pattern is normal by the state of monitor signal.Composition graphs 3 can be seen, REF clock monitor circuit 3 of the present invention, RF clock monitor circuit 4, by a few part composition of power divider, wave detector and amplifier, export V0 and V1 respectively to power supply and supervisory circuit 5.
Power supply of the present invention and supervisory circuit 5 in order to provide synchronous device to need power supply, control and monitor signal.Composition graphs 3 can be seen, power supply of the present invention and supervisory circuit 5 provide+5V power supply to mode switch selection circuit 1, REF clock monitor circuit 3, RF clock monitor circuit 4, the power supply of+12V is provided to VCXO VCXO, and receives output V0 and V1 of REF clock monitor circuit 3, RF clock monitor circuit 4.
According to the present invention, a kind of specific design of analogue echoes SAR synchronous device embodiment is as follows:
In Fig. 1, REF external reference input clock is 10MHz (tested SAR clock), and RFout exports 100MHz.
The present invention is divided into two mode of operations, i.e. External synchronization mode and inter-sync pattern.
External synchronization mode: the control signal C0 of power supply and supervisory circuit 5 exports as high level (logical one), mode switch selection circuit 1 conducting, 10MHz clock signal enters phase-locked crystal oscillating circuit 2, phase-locked crystal oscillating circuit is through the process such as phase demodulation, loop filtering, realize by the steady state (SS) capturing locking fast in conjunction with self-oscillation characteristic, reach the object of tested SAR clock and echo simulator clock synchronous.The now monitoring of REF clock monitor circuit 3, RF clock monitor circuit 4 exports V0, V1 and is high level (logical one).
Inter-sync pattern: the control signal C0 of power supply and supervisory circuit 5 exports as low level (logical zero), mode switch selection circuit 1 turns off, disconnecting external input signal, the high stable crystal oscillator of phase-locked crystal oscillating circuit 2 inside exports 100MHz clock signal, as the reference clock of echo simulator.The now monitoring of REF clock monitor circuit 3, RF clock monitor circuit 4 exports V0, V1 corresponding low level (logical zero), high level (logical one) respectively.
Table 1 is inside and outside synchronizing function pilot signal truth table.
Table 1 inside and outside synchronizing function pilot signal truth table
Present invention also offers a kind of SAR echo simulator synchronous method, comprise the steps:
Select current operation mode,
When being operated in External synchronization mode, mode switch selection circuit 1 is placed in conducting state, now phase-locked crystal oscillating circuit 2 receives the clock reference signal that mode switch selection circuit 1 exports, quick realization is by the stabilization process capturing locking, export corresponding reference frequency to echo simulator source for referencial use, realize outer synchronizing function;
When being operated in inter-sync pattern, mode switch selection circuit 1 is placed in off state, synchronous device and extraneous incoming frequency have nothing to do, described phase-locked crystal oscillating circuit 2 self has signal output function, utilize described phase-locked crystal oscillating circuit 2 to export high stable reference signal to echo simulator source for referencial use, realize inter-sync function.
Wherein, because the present invention easily can realize the switching of inter-sync and External synchronization mode by mode switch selection circuit 1, therefore the present invention both can select only to carry out inter-sync test, also can select only to carry out once outer synchronism detection, or carry out inter-sync and outer synchronous two kinds of tests (sequencing is not limit) successively.
In sum, the present invention has inside and outside synchronism output function simultaneously.Input signal REFin connection mode switch selection circuit, as long as this switch OFF, can cut off external input signal, phase-locked crystal oscillating circuit itself can export high stable reference signal, automatically switches to inter-sync pattern; Otherwise, can external synchronization signal be switched to.Only need line control signal, inside and outside synchronous quick switching can being realized, without the need to changing any cable and hardware facility, reaching the object of tested SAR property indices being carried out to full test, assessment.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a SAR echo simulator synchronous device, comprising:
Mode switch selection circuit (1), for selecting the reference clock signal whether receiving tested SAR, when its conducting, the reference clock signal access synchronous device of tested SAR; When it turns off, the reference clock signal of tested SAR disconnects;
Phase-locked crystal oscillating circuit (2), be connected with described mode switch selection circuit (1) and echo simulator, when described mode switch selection circuit (1) conducting, described phase-locked crystal oscillating circuit (2), as phase-locked loop circuit, outputs to described echo simulator by phase-locked for the clock reference of tested SAR; When described mode switch selection circuit (1) turns off, described self crystal oscillator of phase-locked crystal oscillating circuit (2) outputs to described echo simulator as with reference to source.
2. SAR echo simulator synchronous device according to claim 1, wherein said phase-locked crystal oscillating circuit (2) comprises phase detector PD, loop filter LF, crystal oscillator XO and 1/N frequency divider further, wherein phase detector PD, loop filter LF, crystal oscillator XO connect successively, and 1/N frequency divider is positioned at from crystal oscillator XO to the backfeed loop of phase detector PD.
3. SAR echo simulator synchronous device according to claim 2, wherein said crystal oscillator XO is VCXO VCXO.
4. SAR echo simulator synchronous device according to claim 1, wherein also comprises:
REF clock monitor circuit (3), for the input of mode switch selection circuit (1) output terminal, and outputs to power supply and supervisory circuit (5) by result V0; And
Power supply and supervisory circuit (5) for monitoring telltable clock signal correctness, and are each circuit with stable voltage.
5. SAR echo simulator synchronous device according to claim 4, wherein also comprise: RF clock monitor circuit (4), for the input of phase-locked crystal oscillating circuit (2) output terminal, and result V1 is outputted to power supply and supervisory circuit (5).
6. SAR echo simulator synchronous device according to claim 5, the signal detecting result that wherein said power supply and supervisory circuit (5) input based on described REF clock monitor circuit (3) and RF clock monitor circuit (4), in conjunction with steering order, utilize synchronous regime truth table whether normal to judge the synchronism of described SAR echo simulator synchronous device.
7. a SAR echo simulator synchronous method, comprises the steps:
Select current operation mode,
When being operated in External synchronization mode, mode switch selection circuit (1) is placed in conducting state, now phase-locked crystal oscillating circuit (2) receives the clock reference signal that mode switch selection circuit (1) exports, quick realization is by the stabilization process capturing locking, export corresponding reference frequency to echo simulator source for referencial use, realize outer synchronizing function;
When being operated in inter-sync pattern, mode switch selection circuit (1) is placed in off state, synchronous device and extraneous incoming frequency have nothing to do, described phase-locked crystal oscillating circuit (2) self has signal output function, utilize described phase-locked crystal oscillating circuit (2) to export high stable reference signal to echo simulator source for referencial use, realize inter-sync function.
8. SAR echo simulator synchronous method according to claim 7, wherein said phase-locked crystal oscillating circuit (2) comprises phase detector PD, loop filter LF, crystal oscillator XO and 1/N frequency divider further, wherein phase detector PD, loop filter LF, crystal oscillator XO connect successively, and 1/N frequency divider is positioned at from crystal oscillator XO to the backfeed loop of phase detector PD.
9. SAR echo simulator synchronous method according to claim 7, wherein said crystal oscillator XO is VCXO VCXO.
10. SAR echo simulator synchronous method according to claim 7, also comprises the following steps:
The signal of REF clock monitor circuit (3) to mode switch selection circuit (1) output terminal detects, and result V0 is outputted to power supply and supervisory circuit (5);
The signal of RF clock monitor circuit (4) to phase-locked crystal oscillating circuit (2) output terminal detects, and result V1 is outputted to power supply and supervisory circuit (5);
The signal detecting result that described power supply and supervisory circuit (5) input based on described REF clock monitor circuit (3) and RF clock monitor circuit (4), in conjunction with steering order, utilize synchronous regime truth table whether normal to judge the synchronism of described SAR echo simulator synchronous device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111474522A (en) * | 2020-04-23 | 2020-07-31 | 西安电子工程研究所 | Compensation circuit with different clock phase synchronization |
| CN117111045A (en) * | 2023-10-25 | 2023-11-24 | 成都量芯集成科技有限公司 | Signal generator for phase type laser measurement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5764087A (en) * | 1995-06-07 | 1998-06-09 | Aai Corporation | Direct digital to analog microwave frequency signal simulator |
| CN101782647A (en) * | 2010-02-09 | 2010-07-21 | 南京大学 | Dynamic radar signal simulator |
| CN102419434A (en) * | 2011-08-12 | 2012-04-18 | 西安天伟电子系统工程有限公司 | Intermediate-frequency and radio-frequency universal target simulator for pulse pressure radar |
| CN102866389A (en) * | 2012-09-11 | 2013-01-09 | 中国科学院空间科学与应用研究中心 | Double-channel radar echo simulator and method and system for generating double-channel radar echo signal |
| CN103279378A (en) * | 2013-06-13 | 2013-09-04 | 安徽华东光电技术研究所 | Control method of SAR (synthetic aperture radar) echo signal simulator radio-frequency subsystem |
-
2014
- 2014-10-13 CN CN201410538200.2A patent/CN104330794A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5764087A (en) * | 1995-06-07 | 1998-06-09 | Aai Corporation | Direct digital to analog microwave frequency signal simulator |
| CN101782647A (en) * | 2010-02-09 | 2010-07-21 | 南京大学 | Dynamic radar signal simulator |
| CN102419434A (en) * | 2011-08-12 | 2012-04-18 | 西安天伟电子系统工程有限公司 | Intermediate-frequency and radio-frequency universal target simulator for pulse pressure radar |
| CN102866389A (en) * | 2012-09-11 | 2013-01-09 | 中国科学院空间科学与应用研究中心 | Double-channel radar echo simulator and method and system for generating double-channel radar echo signal |
| CN103279378A (en) * | 2013-06-13 | 2013-09-04 | 安徽华东光电技术研究所 | Control method of SAR (synthetic aperture radar) echo signal simulator radio-frequency subsystem |
Non-Patent Citations (1)
| Title |
|---|
| 徐睿: "《http：//wenku.baidu.com/view/1a46d928915f804d2b16c180.html》", 27 September 2010 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111474522A (en) * | 2020-04-23 | 2020-07-31 | 西安电子工程研究所 | Compensation circuit with different clock phase synchronization |
| CN117111045A (en) * | 2023-10-25 | 2023-11-24 | 成都量芯集成科技有限公司 | Signal generator for phase type laser measurement |
| CN117111045B (en) * | 2023-10-25 | 2023-12-29 | 成都量芯集成科技有限公司 | Signal generator for phase type laser measurement |
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