CN214585965U - Multi-signal amplitude time identification system structure - Google Patents
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Abstract
The utility model discloses a system architecture is distinguished constantly to many signal amplitude, include: the device comprises a laser emitting module, a light receiving diode, a data processing module, a first amplification comparison module and a second amplification comparison module, wherein the cathode of the light receiving diode is connected with the input end of the first amplification comparison module; the output ends of the first amplification comparison module and the second amplification comparison module are both connected with the data processing module; the input end of the second amplification comparison module is connected with the first amplification comparison module; the data processing module is connected with the laser emission module. The amplifying circuit module and the high-speed comparator module of the moment identification system structure can improve the ranging precision under the condition of weak reflectivity, and simultaneously reduce the complexity of the system structure and the spatial layout.
Description
Technical Field
The utility model belongs to the laser radar field, concretely relates to many signal amplitude's identification system structure constantly.
Background
With the development of high and new technologies such as electronic technology, laser technology, optical technology and the like, the laser ranging technology tends to be perfect and mature day by day, the laser ranging technology develops towards the direction of safer measurement, higher precision, smaller system energy consumption and smaller volume, and meanwhile, an important basis is provided for the improvement of a remote range finder.
Laser ranging is performed by taking a laser as a light source, and is generally realized by adopting a pulse method and a phase method. The pulse method distance measurement is that laser is emitted by a distance meter to irradiate a target object, the target object reflects the laser and then is received by the distance meter, the distance meter simultaneously records the round trip time of the laser, and half of the product of the light speed and the round trip time is the distance between the distance meter and the measured object. In the current stage constant threshold value time identification method, light waves start from a distance meter, then irradiate a target object, and return to the distance meter again after being reflected by the target object, echoes received by the distance meter can change according to the surface condition of the target object, and the lower the emissivity of the target object, the smaller the amplitude of the received signal is, so that the distance value triggered by the constant threshold value and the pulse width formed by the two triggers of the rising edge and the falling edge of the signal are severely jittered.
The moment identification method with the constant threshold value is applied more at the present stage, the ranging precision is higher under the condition that the echo signal is stronger, but the ranging precision is obviously reduced under the condition of weak echo.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-mentioned problem that exists among the prior art, the utility model provides a many signal amplitude's identification system structure constantly. The to-be-solved technical problem of the utility model is realized through following technical scheme:
a multiple signal amplitude time instant discrimination system architecture comprising: a laser emitting module, a light receiving diode, a data processing module, a first amplifying and comparing module and a second amplifying and comparing module, wherein,
the cathode of the light receiving diode is connected with the input end of the first amplification comparison module;
the output ends of the first amplification comparison module and the second amplification comparison module are both connected with the data processing module;
the input end of the second amplification comparison module is connected with the first amplification comparison module;
the data processing module is connected with the laser emission module.
In one embodiment of the present invention, the first amplifying and comparing module comprises a first amplifying circuit and a first high-speed comparator, wherein,
the negative pole of light receiving diode is connected to the inverting input end of first amplifier circuit, the homophase input end of first amplifier circuit ground connection, the inverting input end of first high speed comparator and the input of second amplification comparison module are connected respectively to the output of first amplifier circuit, the first invariable threshold value of inputing of the homophase input end of first high speed comparator, the output of first high speed comparator is connected the data processing module.
In one embodiment of the present invention, the second amplifying and comparing module comprises a second amplifying circuit, a second high-speed comparator and an analog switch, wherein,
the anode of the analog switch is connected with the output end of the first amplifying circuit, the cathode of the analog switch is connected with the inverting input end of the second amplifying circuit, the non-inverting input end of the second amplifying circuit is grounded, the output end of the second amplifying circuit is connected with the inverting input end of the second high-speed comparator, the non-inverting input end of the second high-speed comparator inputs a second constant threshold value, and the output end of the second high-speed comparator is connected with the data processing module.
In one embodiment of the present invention, the multi-signal amplitude time discriminating system further comprises a multiplexer, wherein,
the input end of the multi-path selector is respectively connected with the output end of the first high-speed comparator and the output end of the second high-speed comparator, and the output end of the multi-path selector is connected with the data processing module.
In one embodiment of the present invention, the first amplification comparison module comprises a third amplification circuit and a third high speed comparator, wherein,
the negative input end of the third amplifying circuit is connected with the cathode of the light receiving diode, the non-inverting input end of the third amplifying circuit is grounded, the output end of the third amplifying circuit is respectively connected with the negative input end of the third high-speed comparator and the input end of the second amplifying comparison module, the non-inverting input end of the third high-speed comparator inputs a third constant threshold value, and the output end of the third high-speed comparator is connected with the data processing module.
In one embodiment of the present invention, the second amplifying and comparing module comprises a fourth amplifying circuit and a fourth high-speed comparator, wherein,
the inverting input end of the fourth amplifying circuit is connected with the output end of the third amplifying circuit and the inverting input end of the third high-speed comparator respectively, the non-inverting input end of the fourth amplifying circuit is grounded, the output end of the fourth amplifying circuit is connected with the inverting input end of the fourth high-speed comparator, the non-inverting input end of the fourth high-speed comparator inputs a fourth constant threshold value, and the output end of the fourth high-speed comparator is connected with the data processing module.
In an embodiment of the present invention, the signal transmitted by the laser emitting module to the data processing module is a Start pulse signal.
In an embodiment of the present invention, the signal transmitted to the data processing module by any one of the first amplification comparison module and the second amplification comparison module is a Stop pulse signal.
The utility model has the advantages that:
to the condition that prior art range finding precision descends under the weak echo condition, the utility model discloses a system architecture is distinguished constantly to many signal amplitude, include: the first amplification comparison module and the second amplification comparison module of the moment identification system structure can improve the ranging precision under the condition of weak reflectivity, and simultaneously reduce the complexity of the system structure and the spatial layout.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic diagram of a structural module of a multi-signal amplitude time discrimination system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a multi-signal amplitude time discrimination system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another multi-signal amplitude time discrimination system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a constant threshold departure waveform provided by an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited thereto.
Example one
Please refer to fig. 1 and fig. 4, fig. 1 is a schematic diagram of a structural module of a multi-signal amplitude moment discrimination system according to an embodiment of the present invention, and fig. 4 is a schematic diagram of a constant threshold departure waveform according to an embodiment of the present invention. A multiple signal amplitude time instant discrimination system architecture comprising: a laser emitting module 1, a light receiving diode 2, a data processing module 3, a first amplifying and comparing module 4 and a second amplifying and comparing module 5, wherein,
the cathode of the light receiving diode 2 is connected with the input end of the first amplifying and comparing module 4;
the output ends of the first amplification comparison module 4 and the second amplification comparison module 5 are both connected with the data processing module 3;
the input end of the second amplification comparison module 5 is connected with the first amplification comparison module 4;
the data processing module 3 is connected with the laser emitting module 1.
Further, the signal transmitted from the laser emitting module 1 to the data processing module 3 is a Start pulse signal;
at the same time, the signal transmitted to the data processing module 3 by any one of the first amplification comparison module 4 and the second amplification comparison module 5 is a Stop pulse signal.
In this embodiment, a laser emitting module 1 emits a laser to a target object, and at the same time, the laser emitting module 1 generates a Start pulse signal to be sent to a data processing module 3, the Start pulse signal is a signal for the data processing module 3 to Start timing, the data processing module 3 is a processing board with an MCU as a center, then the target object reflects the laser irradiated thereon to a light receiving diode 2 to obtain an initial target echo signal, the initial target echo signal is amplified for the first time by a first amplification and comparison module 4 to obtain a first amplification target echo signal, and then compared with a constant threshold, if the first amplification target echo signal is higher than the constant threshold, the laser echo arrival time is reached, at this time, the first amplification and comparison module 4 generates a first Stop pulse signal and sends the first Stop pulse signal to the data processing module 3, the second amplification comparison module 5 is disconnected from the data processing module 3.
In FIG. 4, twIs the pulse width, VthWhen the pulse width peak value of the initial target echo signal is severely jittered or the initial target echo signal is a weak echo signal and the first amplification comparison module 4 cannot detect the initial target echo signal, the connection between the first amplification comparison module 4 and the data processing module 3 is disconnected and the second amplification comparison module 5 is communicated with the data processing module 3, the constant threshold value is set. And obtaining a second amplified target echo signal after the second amplification by the second amplification and comparison module 5, comparing the second amplified target echo signal with the constant threshold, and if the second amplified target echo signal is higher than the constant threshold, reaching the laser echo arrival time, and generating a second Stop pulse signal by the second amplification and comparison module 5 at this time, and sending the second Stop pulse signal to the data processing module 3.
The high-resistance state Stop pulse signal in the first Stop pulse signal and the second Stop pulse signal is sent to the data processing module 3, the high-resistance state Stop pulse signal is a signal for stopping timing of the data processing module 3, meanwhile, a signal transmitted to the data processing module 3 by the laser emission module 1 is a Start pulse signal, and the data processing module 3 compares a time difference between the Start pulse signal and the high-resistance state Stop pulse signal to obtain a distance from the laser emission module 1 to a target object.
In summary, in the structure of the present time discrimination system, when the first amplification comparison module 4 is connected to the data processing module 3 and the second amplification comparison module 5 is disconnected from the data processing module 3, the first Stop pulse signal is obtained; when the first amplification comparison module 4 is disconnected from the data processing module 3 and the second amplification comparison module 5 is communicated with the data processing module 3, a second Stop pulse signal is obtained, the ranging precision can be improved under the condition of weak reflectivity through switching of two amplification comparison paths, meanwhile, the complexity of a system structure is reduced, and the spatial layout is reduced.
Example two
On the basis of the first embodiment, please refer to fig. 2, and fig. 2 is a schematic structural diagram of a multi-signal amplitude time discrimination system according to an embodiment of the present invention. The first amplification comparison block 4 includes a first amplification circuit 41 and a first high-speed comparator 42, wherein,
the inverting input end of the first amplifying circuit 41 is connected to the cathode of the light receiving diode 2, the non-inverting input end of the first amplifying circuit 41 is grounded, the output end of the first amplifying circuit 41 is connected to the inverting input end of the first high-speed comparator 42 and the input end of the second amplifying comparison module 5, the non-inverting input end of the first high-speed comparator 42 inputs the first constant threshold, and the output end of the first high-speed comparator 42 is connected to the data processing module 3.
In this embodiment, the first target echo signal is amplified by the first amplification and comparison module 4 to obtain a first amplified target echo signal, the first amplification and comparison module 4 includes a first amplification circuit 41 and a first high-speed comparator 42, the first amplification circuit 41 employs a high-gain transimpedance amplifier, and the type of the transimpedance amplifier may be, for example, OPA857, OPA858, or the like. The first amplified target echo signal is compared with a first constant threshold by a first high-speed comparator 42 to obtain a first Stop pulse signal, and the first high-speed comparator 42 is a dual-channel high-speed comparator, and the type of the dual-channel high-speed comparator may be TLV3502, for example.
Specifically, the first amplification and comparison module 4 amplifies and compares a general signal in the first target echo signal to obtain a first Stop pulse signal.
Further, the second amplification comparing block 5 includes a second amplification circuit 51, a second high-speed comparator 52, and an analog switch 53, wherein,
the anode of the analog switch 53 is connected to the output end of the first amplifying circuit 41, the cathode of the analog switch 53 is connected to the inverting input end of the second amplifying circuit 51, the non-inverting input end of the second amplifying circuit 51 is grounded, the output end of the second amplifying circuit 51 is connected to the inverting input end of the second high-speed comparator 52, the non-inverting input end of the second high-speed comparator 52 inputs the second constant threshold, and the output end of the second high-speed comparator 52 is connected to the data processing module 3.
In this embodiment, the analog switch 53 is a high-gain channel between the first amplifying circuit 41 and the second amplifying circuit 51, and can switch on and off of the first amplifying circuit 41 and the second amplifying circuit 51, so as to avoid deep saturation of the amplifying circuits, thereby causing inaccurate distance measurement. When the first high-speed comparator 42 cannot detect the first amplified target echo signal transmitted by the first amplifying circuit 41, or the pulse width peak value of the first target echo signal is jittered sharply, the analog switch 53 turns off the connection between the first high-speed comparator 42 and the first amplifying circuit 41, the first amplifying circuit 41 is used for amplifying a general signal of the first target echo signal to obtain a first amplified target echo signal, and the second amplifying circuit 51 is used for amplifying a weak signal of the first amplified target echo signal to obtain a second amplified target echo signal. Further, the second amplifying circuit 51 is very suitable for high-speed signals because it has no limitation of the fundamental gain-bandwidth product and because of its inherent linearity. The second amplifying circuit 51 employs a 1-2 stage current feedback operational amplifier, which may be of type ADA4860-1, for example.
The second high-speed comparator 52 compares the second amplified target echo signal with a second constant threshold to obtain a second Stop pulse signal, and the second high-speed comparator 52 is a dual-channel high-speed comparator, and the type of the dual-channel high-speed comparator may be TLV3502, for example.
Specifically, the second amplification and comparison module 5 amplifies and compares a weak signal in the first target echo signal to obtain a second Stop pulse signal.
Further, the multiple signal amplitude time instant discrimination system architecture further comprises a multiplexer 6, wherein,
the input end of the multiplexer 6 is connected to the output end of the first high-speed comparator 42 and the output end of the second high-speed comparator 52, and the output end of the multiplexer 6 is connected to the data processing module 3.
Specifically, the multiplexer 6 selects a high-resistance state Stop pulse signal from the first Stop pulse signal and the second Stop pulse signal, and transmits the high-resistance state Stop pulse signal to the data processing module 3.
To sum up, the multi-signal amplitude time discrimination system structure includes two echo signal processing paths, the first amplification and comparison module 4 is used to amplify and compare the general signal of the first target echo, and the second amplification and comparison module 5 is used to amplify and compare the weak signal of the first target echo, that is, on the basis of the general signal processing of the target echo in the prior art, the path for processing the weak signal in the echo signal is added, and the ranging accuracy under the condition of weak reflectivity is improved.
EXAMPLE III
On the basis of the first embodiment, please refer to fig. 3, and fig. 3 is a schematic structural diagram of another multi-signal amplitude time discrimination system provided in the embodiment of the present invention. The first amplification comparison module 4 includes a third amplification circuit 43 and a third high-speed comparator 44, wherein,
the inverting input end of the third amplifying circuit 43 is connected to the cathode of the light receiving diode 2, the non-inverting input end of the third amplifying circuit 43 is grounded, the output end of the third amplifying circuit 43 is connected to the inverting input end of the third high-speed comparator 44 and the input end of the second amplifying comparison module 5, the non-inverting input end of the third high-speed comparator 44 inputs a third constant threshold, and the output end of the third high-speed comparator 44 is connected to the data processing module 3.
In this embodiment, the second target echo signal is amplified by the first amplification and comparison module 4 to obtain a third amplified target echo signal, the first amplification and comparison module 4 includes a third amplification circuit 43 and a third high-speed comparator 44, and the third amplification circuit 43 adopts a high-gain transimpedance amplifier, which may be, for example, an OPA857, an OPA858, or the like. The third amplified target echo signal and the third constant threshold are compared by the third high-speed comparator 44 to obtain a third Stop pulse signal, and the third high-speed comparator 44 adopts a single-channel high-speed comparator, and the model of the single-channel high-speed comparator may be, for example, TLV 3501.
Specifically, the first amplification and comparison module 4 amplifies and compares a general signal in the second target echo signal to obtain a first Stop pulse signal.
Further, the second amplification comparing block 5 includes a fourth amplification circuit 54 and a fourth high-speed comparator 55, wherein,
the inverting input terminal of the fourth amplifying circuit 54 is connected to the output terminal of the third amplifying circuit 43 and the inverting input terminal of the third high-speed comparator 44, respectively, the non-inverting input terminal of the fourth amplifying circuit 54 is grounded, the output terminal of the fourth amplifying circuit 54 is connected to the inverting input terminal of the fourth high-speed comparator 55, the non-inverting input terminal of the fourth high-speed comparator 55 inputs the fourth constant threshold, and the output terminal of the fourth high-speed comparator 55 is connected to the data processing module 3.
In this embodiment, the second amplifying and comparing module 5 amplifies and compares a weak signal in the second target echo signal to obtain a fourth Stop pulse signal. The second amplification comparison module 5 includes a fourth amplification circuit 54 and a fourth high-speed comparator 55, the fourth amplification circuit 54 is used to amplify a weak signal of the third amplified target echo signal to obtain a fourth amplified target echo signal, and meanwhile, the fourth amplification circuit 54 is provided with an enable switch, which can realize the function of an analog switch, when the third high-speed comparator 44 cannot detect the third amplified target echo signal transmitted by the third amplification circuit 43, or the pulse width peak value of the second target echo signal shakes violently, the enable switch of the fourth amplification circuit 54 turns off the connection between the third high-speed comparator 44 and the third amplification circuit 43, thereby avoiding the deep saturation of the amplification circuit and causing inaccurate ranging distance. The fourth amplifying circuit 54 employs an operational amplifier with a high gain-bandwidth product, which may be, for example, LMH 6703.
The fourth high-speed comparator 55 compares the fourth amplified target echo signal with a fourth constant threshold to obtain a fourth Stop pulse signal, the fourth high-speed comparator 55 adopts a single-channel high-speed comparator, the type of the single-channel high-speed comparator can be, for example, TLV3501, the single-channel high-speed comparator TLV3501 is provided with a selection enable pin, and when the first amplification comparing module 4 is turned off, the high-resistance state Stop pulse signal is output and sent to the data processing module 3.
To sum up, the multi-signal amplitude moment identification system structure includes two echo signal processing paths, the first amplification and comparison module 4 is used for amplifying and comparing a general signal of a first target echo, and the second amplification and comparison module 5 is used for amplifying and comparing a weak signal of the first target echo, that is, based on the general signal processing in the prior art, a path for processing the weak signal in the echo signal is added, the ranging accuracy under the condition of weak reflectivity is improved by switching the two echo signal processing paths, and meanwhile, the complexity of the system structure is reduced, and the spatial layout is reduced.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (8)
1. A multiple signal amplitude time instant discrimination system architecture comprising: a laser emitting module (1), a light receiving diode (2), a data processing module (3), a first amplification comparison module (4) and a second amplification comparison module (5), wherein,
the cathode of the light receiving diode (2) is connected with the input end of the first amplification comparison module (4);
the output ends of the first amplification comparison module (4) and the second amplification comparison module (5) are both connected with the data processing module (3);
the input end of the second amplification comparison module (5) is connected with the first amplification comparison module (4);
the data processing module (3) is connected with the laser emitting module (1).
2. The multiple-signal-amplitude time discrimination system architecture according to claim 1, wherein the first amplification comparison module (4) comprises a first amplification circuit (41) and a first high-speed comparator (42), wherein,
the negative pole of light-receiving diode (2) is connected to the inverting input of first amplifier circuit (41), the noninverting input of first amplifier circuit (41) ground connection, the inverting input of first high speed comparator (42) and the input of second enlarged comparison module (5) are connected respectively to the output of first amplifier circuit (41), the first invariable threshold value of the inphase input of first high speed comparator (42), the output of first high speed comparator (42) is connected data processing module (3).
3. The multiple signal amplitude time discrimination system architecture according to claim 2, wherein said second amplification comparison module (5) comprises a second amplification circuit (51), a second high speed comparator (52) and an analog switch (53), wherein,
the anode of the analog switch (53) is connected with the output end of the first amplifying circuit (41), the cathode of the analog switch (53) is connected with the inverting input end of the second amplifying circuit (51), the non-inverting input end of the second amplifying circuit (51) is grounded, the output end of the second amplifying circuit (51) is connected with the inverting input end of the second high-speed comparator (52), the non-inverting input end of the second high-speed comparator (52) inputs a second constant threshold value, and the output end of the second high-speed comparator (52) is connected with the data processing module (3).
4. The multiple-signal-amplitude time instant discrimination system structure of claim 3, further comprising a multiplexer (6), wherein,
the input end of the multiplexer (6) is respectively connected with the output end of the first high-speed comparator (42) and the output end of the second high-speed comparator (52), and the output end of the multiplexer (6) is connected with the data processing module (3).
5. The multiple signal amplitude time discrimination system architecture according to claim 1, wherein said first amplification comparison module (4) comprises a third amplification circuit (43) and a third high-speed comparator (44), wherein,
the negative phase input end of the third amplification circuit (43) is connected with the cathode of the light receiving diode (2), the non-negative phase input end of the third amplification circuit (43) is grounded, the output end of the third amplification circuit (43) is respectively connected with the negative phase input end of the third high-speed comparator (44) and the input end of the second amplification comparison module (5), the non-negative phase input end of the third high-speed comparator (44) inputs a third constant threshold value, and the output end of the third high-speed comparator (44) is connected with the data processing module (3).
6. The multiple-signal-amplitude time discrimination system architecture according to claim 5, wherein the second amplification comparison module (5) comprises a fourth amplification circuit (54) and a fourth high-speed comparator (55), wherein,
the inverting input end of the fourth amplifying circuit (54) is connected with the output end of the third amplifying circuit (43) and the inverting input end of the third high-speed comparator (44) respectively, the non-inverting input end of the fourth amplifying circuit (54) is grounded, the output end of the fourth amplifying circuit (54) is connected with the inverting input end of the fourth high-speed comparator (55), the non-inverting input end of the fourth high-speed comparator (55) inputs a fourth constant threshold value, and the output end of the fourth high-speed comparator (55) is connected with the data processing module (3).
7. The multiple-signal-amplitude time discrimination system structure according to claim 1, wherein the signal transmitted from the laser emission module (1) to the data processing module (3) is a Start pulse signal.
8. The multiple signal amplitude time discrimination system architecture according to claim 1, wherein the signal transmitted to the data processing module (3) by either of the first amplification comparison module (4) and the second amplification comparison module (5) is a Stop pulse signal.
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