CN107229042A - A kind of laser signal detection means and control method based on DSP embedded systems - Google Patents
A kind of laser signal detection means and control method based on DSP embedded systems Download PDFInfo
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- CN107229042A CN107229042A CN201710329905.7A CN201710329905A CN107229042A CN 107229042 A CN107229042 A CN 107229042A CN 201710329905 A CN201710329905 A CN 201710329905A CN 107229042 A CN107229042 A CN 107229042A
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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
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/486—Receivers
- G01S7/4861—Circuits for detection, sampling, integration or read-out
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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
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/486—Receivers
- G01S7/489—Gain of receiver varied automatically during pulse-recurrence period
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Abstract
The invention discloses a kind of laser signal detection means and control method based on DSP embedded systems, the present apparatus is made up of 4 quadrant detector, prober interface plate, signal-processing board, data processing plate, power panel.Prober interface plate includes single-ended transfer difference circuit；Signal-processing board includes differential received circuit, main amplification gain control circuit, variable gain control circuit, summing circuit, comparison circuit and peak holding circuit；Data processing plate includes DSP Processor, D/A change-over circuits, analog switching circuit, CAN drive circuit, wherein CAN drive circuit is connected with host computer, D/A change-over circuits are connected with detector assembly, comparison circuit, variable gain control circuit respectively, DSP Processor controls circuit, 4 quadrant detector to connect with peak holding circuit, comparison circuit, main amplification gain respectively by GPIO modules, and apparatus of the present invention the detection of fixed cycle laser signal can be completed by control algolithm and target offset angle is resolved.
Description
Technical field
The invention belongs to field of signal processing, and in particular to a kind of laser signal detection dress based on DSP embedded systems
Put and control method, in laser measurement system, realizing the detection, identification and angular surveying to laser signal.
Background technology
Laser detection is exactly, using laser as information carrier, displacement, distance and deflecting angle to be carried out to fixed or mobile target
The measurement of degree, because the monochromaticjty of laser is good, the angle of divergence of light beam is small, therefore with very high accuracy of detection, detection range and
Stronger antijamming capability, compared with other manner detection means, relatively simple, lower-cost advantage is constituted with system.
One complete laser detection system is divided into irradiator and receiver, and irradiator sends the laser pulse signal of certain frequency, right
Target object is irradiated, and laser is scattered to all directions after being reflected through target, some scattered light returns to receiver, and receiver is born
Duty laser pulse signal is intercepted and captured, analyzed and identifies target laser signal by predetermined judgment criterion in real time.Current laser letter
Realized more than number detection means using simulation resolution element, the integrated level of system is not high, volume is big, to external world and circuit noise interference
Compare sensitive；Use single-chip microcomputer framework more the control system of most of device, exist and reality is performed to data processing and recognizer
The not high shortcoming of when property.
The content of the invention
It is an object of the invention to provide a kind of laser signal detection means and control method based on DSP embedded systems,
For in laser measurement system, realization to be real-time to laser signal, stably, reliably detects, recognize and angular surveying.
The technical solution adopted for the present invention to solve the technical problems is to provide a kind of swashing based on DSP embedded systems
Optical signal detecting device, it is characterised in that：At 4 quadrant detector, prober interface plate, signal-processing board and data
Manage plate；
The 4 quadrant detector is used to gather the laser signal, and the laser signal is converted into four tunnel pulse voltages
Signal；
The prober interface plate is arranged between the 4 quadrant detector and the signal-processing board, for transmitting
State laser signal and perform Signal Pretreatment in the signal-processing board；
The signal-processing board is connected with the data processing plate, and the data processing plate realizes institute with upper electrical communication
State the master control of detection means and the detection of the laser signal；
The prober interface plate includes single-ended transfer difference circuit, for four road pulse voltage signal to be changed into four
Road differential signal；
The signal-processing board includes differential received circuit, main amplification gain control circuit, variable gain control circuit, peak value
Holding circuit, summing circuit and comparison circuit；
The differential received circuit receives four road differential signal and is converted into four road single-ended signals；
The main amplification gain control circuit and the variable gain control circuit are according to the four roads single-ended signal amplitude
Size is amplified or decayed, by magnitude of voltage control in the range of peak holding circuit requirement；
The pulsewidth of the amplification or the decay road single-ended signals of Hou tetra- is performed broadening and is transmitted in by the peak holding circuit
The data processing plate, is sent in the A/D collectors in the DSP Processor；
The amplification or the decay road single-ended signals of Hou tetra- are performed summation by the summing circuit, by the comparison circuit
Synchronous transmission of signal is produced in the data processing plate, so as to realize the detection calculations of the laser signal；
The data processing plate includes DSP Processor, D/A change-over circuits, analog switching circuit, CAN drive circuit；
The DSP Processor by the D/A change-over circuits respectively with the 4 quadrant detector, the variable gain control
Circuit processed, the comparison circuit are connected, and for the bias gain control of the 4 quadrant detector, Distinct matrix and compare
Device threshold voltage is controlled；
The DSP Processor is connected by the analog switching circuit with the peak holding circuit, for the peak value
The enable control of holding circuit；
The DSP Processor realizes telecommunication by the CAN drive circuit and the host computer.
Further, the detection means also includes power panel, and power supply is provided for the detection means.
Further, the data processing plate also realizes bias gain control and front gain to the 4 quadrant detector
Control.
Further, the host computer sends control command, laser code cycle in the DSP Processor, receives simultaneously
Laser signal detection status information and Angle Information that the DSP Processor is returned.
The invention also discloses a kind of control method of the laser detector based on DSP embedded systems, its feature exists
In the control method mainly comprises the following steps：
STEP1:The DSP Processor, which receives the host computer and sent, starts order, starts the DSP Processor,；
STEP2:The DSP Processor starts ECAP modules therein, and opens the ratio by GPIO modules therein
Compared with circuit and the peak holding circuit, the detection means overall startup；
STEP3:The ECAP modules catch the rising edge and trailing edge of the synchronizing signal of the comparison circuit output, calculate
Go out the cycle of the synchronizing signal, and the laser code cycle sent with the host computer performs contrast, if comparing result is less than
The threshold value of setting, then judge to detect the laser signal, perform the step STEP4；If it is not, then judging the laser letter
Number lose, perform the step STEP5；
STEP4:Into data processing state, the A/D collectors start after the completion of the collection for performing signal, and collection
The comparison circuit is closed, the processing of the laser signal is completed in the timer setting time of the DSP Processor, is handled
After the completion of open the comparison circuit and be transferred to the step STEP3, prepare to receive the laser signal of next sequential；
STEP5:The laser signal is lost, and the DSP Processor switches the detection means to detection state, and by institute
Preamplification gain, bias gain, main amplification gain, variable gain and the comparison circuit state is stated to be also switched to reset condition and perform
The step STEP3.
Further, the processing of the laser signal is：
The angle of pitch and azimuth analytical algorithm such as formula (1), (2), (3), shown in (4):
In the formula (1) and the formula (2), x and y are apart from the pitching side at the 4 quadrant detector (1) center
To the offset with azimuth direction, kxAnd kyIt is invariant, is determined as the property parameters type corresponding to the 4 quadrant detector
It is fixed；
θ in the formula (3) and the formula (4)xFor the angle of pitch of resolving, θyFor the azimuth of resolving, f is described four
Quadrant detector focal length.
Compared to technical characterstic of the prior art, of the invention has the technical effect that following aspect：
(1) control device of the invention uses separate between modularization, General design, each functional module, integrated
Degree is high, small volume；
(2) control device of the invention is entered using differential signal and transmitted between andante, the ability with anti-noise jamming；
(3) control device of the invention enters line broadening using peak holding circuit to the pulsewidth of laser pulse signal, can
Improve the stability that angle is resolved；
(4) control device of the invention catches laser pulse using the ECAP modules of level Four gain control and DSP Processor
Signal rising edge and trailing edge, can detect the laser signal of fixed frequency and energy intensity, and algorithm accuracy of detection is high, in real time
Property, reliability, strong adaptability, with certain jamproof ability.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is hardware logic block diagram of the present invention；
Fig. 3 is main program logic block diagram of the present invention；
Fig. 4 is interrupt control logic block diagram of the present invention；
Fig. 5 is data processing state logic diagram of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Not constituting conflict each other can just be mutually combined
Below in conjunction with drawings and examples, the present invention is further described.
Fig. 1 is structural representation of the invention：The present invention is by 4 quadrant detector 1, prober interface plate 2, signal transacting
Plate 3, data processing plate 4 and power panel 55 are constituted, and 4 quadrant detector 1 is directly welded on prober interface plate 2, and device is surveyed in detection
Connected between interface board 2, signal-processing board 3, data processing plate 4 and power panel 5 by connector.
Wherein, the composition structure of its detection means is：Laser signal detection means includes prober interface plate 2, at signal
Plate 3, data processing plate 4 are managed, prober interface plate 2 is connected with signal-processing board 3, wherein the differential received in signal-processing board 3
The differential signal that single-ended transfer difference circuit is transmitted in circuit pick-up probe interface board 2, signal-processing board 3 and data processing plate 4
It is connected, receives the signal that signal-processing board 3 is transmitted, data processing plate 4 is connected with host computer, receives the startup life that host computer is sent
Order；
Prober interface plate 2 includes 4 quadrant detector 1 and single-ended transfer difference circuit, and 4 quadrant detector 1 is used to swash
Optical signal is converted to four road pulse voltage signals, and four road pulse voltage signals are converted into four tunnel difference by single-ended transfer difference circuit to be believed
Number, send the differential received circuit in the signal-processing board 3 to, reduce common mold noise interference；
Signal-processing board 3 includes differential-to-single-ended circuit, main amplification gain control circuit, variable gain control circuit, peak value
Holding circuit, summing circuit and comparison circuit, the single-ended transfer difference circuit of differential-to-single-ended circuit and prober interface unit connect
Connect, the four road differential pulse voltage signals for prober interface unit to be exported are converted into single-ended signal, main amplification gain control
Circuit and variable gain control circuit are amplified or decayed according to the size of four road pulse voltage amplitudes, and magnitude of voltage control is existed
In the range of peak holding circuit requirement, the pulsewidth of four road pulse voltage signals is entered line broadening by peak holding circuit, to enter
Row AD is gathered, and summing circuit is summed four road pulse voltage signals, then produces synchronizing signal and number by comparison circuit
It is connected according to DSP Processor in process plate 4, realizes that laser signal is detected；
Data processing plate 4 includes DSP Processor, D/A change-over circuits, analog switching circuit, CAN drive circuit, DSP
Processor is connected by D/A change-over circuits respectively at 4 quadrant detector 1, variable gain control circuit, comparison circuit, for four
The bias gain circuitry bias voltage of quadrant detector 1 is provided, Distinct matrix and comparator threshold voltage are controlled, DSP processing
Device is connected with peak-holding circuit by analog switching circuit, control is enabled for peak-holding circuit, and DSP Processor is visited with four-quadrant
Device 1, comparison circuit, master gain is surveyed to be connected, for the gain control of the bias of 4 quadrant detector 1, comparison circuit enable control and
Master gain control
Fig. 2 is hardware logic block diagram of the present invention：During work, DSP Processor by D A change-over circuits be 4 quadrant detector
1 bias gain circuitry provides bias voltage, control variable gain multiplication factor, concurrently sets the threshold value of comparator, and passes through
GPIO modules and analog switching circuit will open the preamplification gain of 4 quadrant detector 1, bias gain, main amplification gain, upper
Machine by CAN communication circuit first send the laser code cycle give DSP Processor preserve.Host computer sends " starting order " to DSP
After processor, DSP Processor starts ECAP modules, and by GPIO modules, comparator and peak holding circuit is enabled and opened,
Whole device is in running order.When 4 quadrant detector 1 receives laser pulse signal, laser signal is converted into four tunnels
Pulse voltage signal is simultaneously amplified, by single-ended transfer difference circuit conversion into differential signal, is transmitted to signal-processing board 3, poor
Point turn single-end circuit is reduced into single-ended signal by differential signal, by preamplification gain, bias gain, main amplification gain, variable gain
After amplification, pulse stretching is on the one hand carried out by peak holding circuit, in order to which AD is gathered, on the other hand four road voltage signals are passed through
Summing circuit and comparison circuit are crossed, is exported with laser signal phase identical synchronizing signal to DSP Processor, DSP is according to synchronization
The cycle of signal is compared with the laser pattern cycle preserved and pulse width, and whether the laser signal that detection is currently received
For target laser signal, if it is, DSP Processor just starts A/D module, four tunnel pulse voltages are gathered, and according to four road magnitudes of voltage
Size carry out angle parsing, and according to four road voltages and value judge four tunnel pulse voltage values whether higher or lower than peak value guarantor
The input voltage value required by circuit is held, if being higher than, the bias that basis and value size close 4 quadrant detector 1 accordingly increases
Benefit and preamplification gain and main amplification gain, while adjusting variable gain multiplication factor.Similarly, if being less than, accordingly open this what
Gain, adjusts variable gain multiplication factor.
As shown in figure 3, when DSP Processor receives host computer transmission " starting order ", system initialization is opened ECAP and interrupted
Module, progress initialization of variable, system energization Autonomous test, now working condition is wait state, opens three stage gains and peak value
Holding circuit, and variable gain is initialized, initialization comparator threshold voltage opens comparator, and the circulation into working condition is sentenced
Disconnected, if detection state, then system entering signal detection module carries out signal transacting, if wait state, then system entrance etc.
Status processing module is treated, if data processing state, then system enters data processing module, be to terminate to follow when signal transacting is finished
Ring.
As shown in figure 4, when system is under detection state, the synchronizing signal of ECAP module start recordings comparator output it is upper
Edge and trailing edge event are risen, system carries out the detection of laser signal, according to the synchronizing signal rising edge and trailing edge event of preservation
The arrival time, calculate cycle of synchronizing signal, and the laser code cycle sent with host computer is compared, if less than one
Determine threshold value, then it is assumed that have found target laser signal, working state of system is set to data processing, start startup A/D module collection and work as
Preceding four tunnels pulse voltage value, closes comparator and opens CpuTimer timers and start timing, work as timing time after the completion of collection
Then, into CpuTimer interrupt service routines, remove and interrupt answer logo, terminate this interrupt service routine, if system exists
Carry out not detecting success during laser signal detection, then assertive goal laser signal is lost, jump directly to remove and interrupt response
Mark, end interrupt service routine.
Fig. 3, Fig. 4 are software flow block diagram of the invention：Control algolithm depends on DSP Processor presence, software main flow
As shown in figure 3, software operates mainly in wait, detection and data processing working condition.Under wait state, DSP Processor is waited
The command information that host computer is sent is received, when DSP Processor, which receives host computer, sends " starting order ", DSP starts ECAP moulds
Block and by GPIO modules, comparator and peak holding circuit are enabled and opened, whole device is started working, working condition is cut
Change to detection state.Under detection state, ECAP modules start to catch the rising edge and trailing edge of the synchronizing signal of comparator output
Event, when meeting the interrupt event of ECAP modules setting, into ECAP interrupt service routines, as shown in figure 4, according to the same of preservation
The arrival time of step signal rising edge and trailing edge event, the cycle for calculating synchronizing signal, and the laser sent with host computer
Code period is compared, if less than certain threshold value, then it is assumed that have found target laser signal, working condition is switched at data
Reason state, starts to start the current four tunnels pulse voltage value of A/D module collection, comparator is closed after the completion of collection and starts timing, is counted
When work using DSP a CpuTimer timer carry out, timing time then, into CpuTimer interrupt service routines,
Comparator is opened in interrupt service routine to enable, and prepares to receive next laser signal.
Software enters after data processing state, if as shown in figure 5, laser signal is lost, working condition switching can be detected
State, and preamplification gain, bias gain, main amplification gain, variable gain and comparator state are also switched to reset condition.If inspection
Measure laser signal and then carry out gain control and angle parsing, the angle of pitch and azimuth parsing according to the four road magnitudes of voltage collected
Algorithm such as formula (1), (2), (3), (4) are shown.
In formula (1) and formula (2), x and y are the pitch orientation and azimuth direction apart from the center of 4 quadrant detector 1
Offset, kxAnd kyIt is invariant, and the type model of 4 quadrant detector 1 is determined.
θ in formula (3) and formula (4)xFor the angle of pitch of resolving, θyFor the azimuth of resolving, f is that 4 quadrant detector is burnt
Away from.
4 quadrant detector in the present invention is the device being readily available, and preamplification gain and bias gain are included inside it
Two-stage amplifying circuit, wherein preamplification gain are fixed gain (amplification/attenuation multiple is fixed), and one is provided by DSP GPIO mouths
Individual level signal can be opened or closed.
Bias gain is variable gain, and exporting different bias voltages by D/A chips gives bias gain circuitry, and it is put
Greatly/attenuation multiple is different, and providing a level signal by DSP GPIO mouths can open or close.
Also there are two stage gains on signal-processing board, be main amplification gain and variable gain respectively, main amplification gain is fixed gain,
There is provided a level signal by DSP GPIO mouths can open or close；Variable-gain amplification circuit is again by D/A cores
Piece exports different voltages to adjust amplification/attenuation multiple.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (6)
1. a kind of laser signal detection means based on DSP embedded systems, it is characterised in that：Including 4 quadrant detector (1),
Prober interface plate (2), signal-processing board (3) and data processing plate (4)；
The 4 quadrant detector (1) is used to gather the laser signal, and the laser signal is converted into four tunnel pulse voltages
Signal；
The prober interface plate (2) is arranged between the 4 quadrant detector (1) and the signal-processing board (3), is used for
Transmit the laser signal and perform Signal Pretreatment in the signal-processing board (3)；
The signal-processing board (3) is connected with the data processing plate (4), the data processing plate (4) and upper electrical communication
Realize the master control of the detection means and the detection of the laser signal；
The prober interface plate (2) includes single-ended transfer difference circuit, for four road pulse voltage signal to be changed into four
Road differential signal；
The signal-processing board (3) includes differential received circuit, main amplification gain control circuit, variable gain control circuit, peak value
Holding circuit, summing circuit and comparison circuit；
The differential received circuit receives four road differential signal and is converted into four road single-ended signals；
The main amplification gain controls circuit and the variable gain control circuit according to the size of the four roads single-ended signal amplitude
It is amplified or decays, by magnitude of voltage control in the range of peak holding circuit requirement；
The pulsewidth execution broadening of the amplification or the decay road single-ended signals of Hou tetra- is transmitted in described by the peak holding circuit
Data processing plate (4), is sent in the A/D collectors in the DSP Processor；
The amplification or the decay road single-ended signals of Hou tetra- are performed summation by the summing circuit, are produced by the comparison circuit
Synchronous transmission of signal is in the data processing plate (4), so as to realize the detection calculations of the laser signal；
The data processing plate (4) includes DSP Processor, D/A change-over circuits, analog switching circuit, CAN drive circuit；
The DSP Processor is electric with the 4 quadrant detector, the Distinct matrix respectively by the D/A change-over circuits
Road, the comparison circuit are connected, bias gain control, Distinct matrix and comparator threshold for the 4 quadrant detector
Threshold voltage is controlled；
The DSP Processor is connected by the analog switching circuit with the peak holding circuit, for the peak holding
The enable control of circuit；
The DSP Processor realizes telecommunication by the CAN drive circuit and the host computer.
2. the laser signal detection means as claimed in claim 1 based on DSP embedded systems, it is characterised in that the inspection
Surveying device also includes power panel (5), and power supply is provided for the detection means.
3. the laser signal detection means as claimed in claim 1 or 2 based on DSP embedded systems, it is characterised in that described
Data processing plate (4) also realizes that bias gain control and front gain are controlled to the 4 quadrant detector (1).
4. the laser signal angle-measuring equipment as claimed in claim 3 based on DSP embedded systems, it is characterised in that on described
Position machine sends control command, laser code cycle in the DSP Processor, while receiving the institute that the DSP Processor is returned
State laser signal detection status information and Angle Information.
5. a kind of control of the laser detector based on DSP embedded systems in 1-4 such as claim as described in any one
Method, it is characterised in that the control method mainly comprises the following steps：
STEP1:The DSP Processor, which receives the host computer and sent, starts order, starts the DSP Processor,；
STEP2:The DSP Processor starts ECAP modules therein, and electric by the comparison of GPIO modules therein opening
Road and the peak holding circuit, the detection means overall startup；
STEP3:The ECAP modules catch the rising edge and trailing edge of the synchronizing signal of the comparison circuit output, calculate institute
The cycle of synchronizing signal is stated, and the laser code cycle sent with the host computer performs contrast, if comparing result is less than setting
Threshold value, then judge to detect the laser signal, perform the step STEP4；If it is not, then judging that the laser signal is lost
Lose, perform the step STEP5；
STEP4:Into data processing state, the A/D collectors are closed after the completion of starting the collection for performing signal, and collection
The comparison circuit, completes the processing of the laser signal in the timer setting time of the DSP Processor, and processing is completed
After open the comparison circuit and be transferred to the step STEP3, prepare to receive the laser signal of next sequential；
STEP5:The laser signal is lost, and the DSP Processor switches the detection means to detection state, and will be described before
Amplification gain, bias gain, main amplification gain, variable gain and the comparison circuit state are also switched to reset condition and performed described
Step STEP3.
6. laser signal as claimed in claim 5 detects control method, it is characterised in that the processing of the laser signal is：
The angle of pitch and azimuth analytical algorithm such as formula (1), (2), (3), shown in (4):
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In the formula (1) and the formula (2), x and y be apart from the 4 quadrant detector (1) center pitch orientation and
The offset of azimuth direction, kxAnd kyIt is invariant, it is true as the property parameters corresponding to the 4 quadrant detector (1) type
It is fixed；
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The focal length of detector (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710329905.7A CN107229042A (en) | 2017-05-11 | 2017-05-11 | A kind of laser signal detection means and control method based on DSP embedded systems |
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| CN109814609A (en) * | 2019-02-18 | 2019-05-28 | 湖北三江航天万峰科技发展有限公司 | Opto-electronic Tracking Servo System and method for tracking target |
| CN111817454A (en) * | 2019-07-26 | 2020-10-23 | 青岛帕沃思智能科技有限公司 | Wireless power supply device and control method thereof |
| CN111934779A (en) * | 2020-07-06 | 2020-11-13 | 杭州电子科技大学 | Laser signal recovery module, multipoint-aligned underwater laser communication system and method |
| CN112197656A (en) * | 2020-10-30 | 2021-01-08 | 中国兵器工业集团第二一四研究所苏州研发中心 | Guidance bullet based on microsystem |
| CN112688649A (en) * | 2021-01-08 | 2021-04-20 | 北京轩宇空间科技有限公司 | Control circuit and control method for automatic gain of photoelectric detection system |
| CN113721247A (en) * | 2021-09-23 | 2021-11-30 | 湖北三江航天万峰科技发展有限公司 | Miniaturized laser detection device |
| CN115348129A (en) * | 2022-07-20 | 2022-11-15 | 西安电子科技大学芜湖研究院 | CAN transceiver receiving circuit |
| CN115811371A (en) * | 2022-12-08 | 2023-03-17 | 厦门亿芯源半导体科技有限公司 | Threshold programmable loss of signal detection circuit with temperature and process compensation |
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| CN115348129A (en) * | 2022-07-20 | 2022-11-15 | 西安电子科技大学芜湖研究院 | CAN transceiver receiving circuit |
| CN115348129B (en) * | 2022-07-20 | 2023-08-15 | 西安电子科技大学芜湖研究院 | CAN transceiver receiving circuit |
| CN115811371A (en) * | 2022-12-08 | 2023-03-17 | 厦门亿芯源半导体科技有限公司 | Threshold programmable loss of signal detection circuit with temperature and process compensation |
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