CN111487605A - Signal processing circuit suitable for high-precision laser ranging - Google Patents
Signal processing circuit suitable for high-precision laser ranging Download PDFInfo
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- CN111487605A CN111487605A CN202010467808.6A CN202010467808A CN111487605A CN 111487605 A CN111487605 A CN 111487605A CN 202010467808 A CN202010467808 A CN 202010467808A CN 111487605 A CN111487605 A CN 111487605A
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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
- G01S7/491—Details of non-pulse systems
- G01S7/4912—Receivers
- G01S7/4913—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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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- Computer Networks & Wireless Communication (AREA)
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- Radar, Positioning & Navigation (AREA)
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- Optical Radar Systems And Details Thereof (AREA)
Abstract
A signal processing circuit suitable for high-precision laser ranging comprises a signal blocking circuit positioned at the front end, a single-ended to differential signal processing circuit positioned in the middle and an A/D sampling circuit positioned at the rear end, wherein the signal blocking circuit, the single-ended to differential signal processing circuit and the A/D sampling circuit are sequentially connected; the signal blocking circuit is controlled by a capacitor C9, and an output signal of the signal blocking circuit is pulled down to be grounded through a resistor R9; the single-end-to-differential signal processing circuit comprises a differential operational amplifier U6, a matching resistor R51, a matching resistor R53, a resistor R58, a resistor R59, a resistor R60, a resistor R50, a resistor R1 and a resistor R2; the A/D sampling circuit comprises a resistor R52, a resistor R4, a resistor R3, a resistor R55, a resistor R7, a resistor R15, a capacitor C4 and an AD sampling chip U2; the invention overcomes the problems in the signal processing circuit in the existing digital laser ranging system, can restore the waveform of the echo analog signal without distortion, and effectively improves the measuring range and the precision of the semiconductor laser ranging machine.
Description
Technical Field
The invention belongs to the technical field of laser photoelectricity, relates to an analog signal processing circuit, and particularly relates to a signal processing circuit suitable for high-precision laser ranging.
Background
In a high-precision digital laser ranging system, a digital superposition averaging technology is commonly used to improve the range measurement and precision, and the requirement on a signal processing circuit module is very high. When an input analog signal is processed, an amplified and shaped analog laser echo signal needs to be discretized through a signal processing circuit, and then a digital signal is transmitted to the FPGA for processing, so that the performance of the signal processing circuit directly influences the strength of a signal received by the FPGA, and further influences the range measurement and precision of the laser range finder.
At present, a front-end signal processing circuit is mostly applied to a single-end input AD chip, and the design has the defects of phase mismatch and impedance mismatch of output signals, and the AD sampling result is directly influenced. In addition, even order harmonics easily appear in the analog signal processing circuit in the prior art, and the signal acquisition quality is poor, which affects the performance of the ADC.
Disclosure of Invention
In view of the above, to solve the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a signal processing circuit suitable for high-precision laser ranging, which overcomes the problems of the signal processing circuit in the conventional digital laser ranging system, and can restore the waveform of an echo analog signal without distortion, thereby effectively improving the ranging and precision of a semiconductor laser ranging machine.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a signal processing circuit suitable for high-precision laser ranging comprises a signal blocking circuit positioned at the front end, a single-ended to differential signal processing circuit positioned in the middle and an A/D sampling circuit positioned at the rear end, wherein the signal blocking circuit, the single-ended to differential signal processing circuit and the A/D sampling circuit are sequentially connected;
the single-end-to-differential signal processing circuit comprises a differential operational amplifier U6, a matching resistor R51, a matching resistor R53, a resistor R58, a resistor R59, a resistor R60, a resistor R50, a resistor R1 and a resistor R2, wherein a pin 1 of the differential operational amplifier U6 is connected with the matching resistor R6 and then grounded, a pin 1 of the differential operational amplifier U6 is connected with a pin 4 of the differential operational amplifier U6 through the resistor R6 and then connected with a pin 4 of the differential operational amplifier U6, a pin 8 of the differential operational amplifier U6 is connected with an echo analog signal after being blocked by a signal blocking circuit after being connected with the matching resistor R6, a pin 8 of the differential operational amplifier U6 is also connected with a pin 5 of the differential operational amplifier U6 through the resistor R6, a pin 2 of the differential operational amplifier U6 is connected with an operational circuit consisting of the resistor R6 and the resistor R6, the resistor R6 is connected with a capacitor C6 in parallel with a capacitor C6 and a filter circuit, and a differential operational amplifier U6 are connected with a voltage divider circuit and a differential operational amplifier U36, The resistor R2 is used for impedance matching;
the A/D sampling circuit comprises a resistor R52, a resistor R4, a resistor R3, a resistor R55, a resistor R7, a resistor R15, a capacitor C4 and an AD sampling chip U2, wherein one end of the resistor R52 is connected to the output end of the resistor R1, the other end of the resistor R52 is connected to a pin 26 of the AD sampling chip U2 through a resistor R7, is connected to a pin 30 of the AD sampling chip U2 through a resistor R4, and is grounded through a capacitor C4, one end of the resistor R3 is connected to the output end of the resistor R2, and the other end of the resistor R3 is connected to a pin 26 of the AD sampling chip U2 through a resistor R15 and is connected to a pin 29 of the AD sampling chip U2 through a resistor R55.
Furthermore, when the semiconductor laser range finder measures the distance, laser is sent to a measured target, echo reflection is carried out, photoelectric conversion is carried out through a receiving circuit to laser echo analog signals, the laser echo analog signals are discretized through a signal processing circuit, and then the discrete signals are collected and processed through an FPGA main control circuit.
Further, the differential operational amplifier U6 is a single-ended to differential operational amplifier AD 8138.
Further, the differential operational amplifier U6 includes 8 pins.
Further, the AD sampling chip U2 is a differential input chip ADs 9634.
Furthermore, the AD sampling chip U2 includes 32 pins, the 1, 2, 4~7, 9~24 pins of AD sampling chip U2 connect the pin of FPGA to by FPGA control its input, output state, the 27, 28, 31, 32 pins of AD sampling chip U2 connect the analog power positive pole, the 7, 8, 17 pins of AD sampling chip U2 connect the digital power positive pole.
Furthermore, the signal blocking circuit is controlled by a capacitor C9, and an output signal of the signal blocking circuit is pulled down to the ground through a resistor R9.
Further, the differential operational amplifier U6 controls the differential output voltage and the common mode output voltage through two feedback loops consisting of a resistor R50 and a resistor R60, respectively.
The invention has the beneficial effects that:
the signal processing circuit suitable for high-precision laser ranging overcomes the problems in the signal processing circuit in the existing digital laser ranging system, can restore the waveform of an echo simulation signal without distortion, effectively improves the measuring range and precision of a semiconductor laser ranging machine, and can be better and widely applied to the semiconductor laser ranging machine;
according to the invention, a single-end-to-differential signal processing circuit is formed by adopting a single-end-to-differential operational amplifier AD8138 and a high-sampling-rate differential input chip ADS9634, so that output gain and phase matching balance can be provided, even order harmonics are inhibited to a certain extent, the signal acquisition quality is improved, and the ADC performance is optimized;
the invention mainly provides a signal processing circuit system with excellent performance, wherein laser echo analog signals are discretized through a signal processing circuit, then the FPGA main control circuit collects and processes the discrete signals, and the signal processing circuit with excellent performance is required for signal conditioning in order to restore the echo analog signals without distortion.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of the echo simulation signal flow of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The following specific examples are given to further clarify, complete and detailed the technical solution of the present invention. The present embodiment is a preferred embodiment based on the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
In the invention, when the semiconductor laser range finder is used for ranging, laser is emitted to a measured target, an echo is reflected back, photoelectric conversion is carried out through a receiving circuit, a received echo analog signal is discretized through a signal processing circuit and is read and subjected to algorithm operation by an FPGA (field programmable gate array) main control circuit, and the target distance is calculated. The present invention addresses the superior characteristics of signal processing circuits.
The invention relates to a signal processing circuit suitable for high-precision laser ranging, which comprises a signal blocking circuit positioned at the front end, a single-end to differential signal processing circuit positioned in the middle and an A/D sampling circuit positioned at the rear end, wherein the signal blocking circuit, the single-end to differential signal processing circuit and the A/D sampling circuit are sequentially connected;
the single-end-to-differential signal processing circuit comprises a differential operational amplifier U6, a matching resistor R51, a matching resistor R53, a resistor R58, a resistor R59, a resistor R60, a resistor R50, a resistor R1 and a resistor R2, wherein a pin 1 of the differential operational amplifier U6 is connected with the matching resistor R6 and then grounded, a pin 1 of the differential operational amplifier U6 is connected with a pin 4 of the differential operational amplifier U6 through the resistor R6 and then connected with a pin 4 of the differential operational amplifier U6, a pin 8 of the differential operational amplifier U6 is connected with an echo analog signal after being blocked by a signal blocking circuit after being connected with the matching resistor R6, a pin 8 of the differential operational amplifier U6 is also connected with a pin 5 of the differential operational amplifier U6 through the resistor R6, a pin 2 of the differential operational amplifier U6 is connected with an operational circuit consisting of the resistor R6 and the resistor R6, the resistor R6 is connected with a capacitor C6 in parallel with a capacitor C6 and a filter circuit, and a differential operational amplifier U6 are connected with a voltage divider circuit and a differential operational amplifier U36, The resistor R2 is used for impedance matching;
the A/D sampling circuit comprises a resistor R52, a resistor R4, a resistor R3, a resistor R55, a resistor R7, a resistor R15, a capacitor C4 and an AD sampling chip U2, wherein one end of the resistor R52 is connected to the output end of the resistor R1, the other end of the resistor R52 is connected to a pin 26 of the AD sampling chip U2 through a resistor R7, is connected to a pin 30 of the AD sampling chip U2 through a resistor R4, and is grounded through a capacitor C4, one end of the resistor R3 is connected to the output end of the resistor R2, and the other end of the resistor R3 is connected to a pin 26 of the AD sampling chip U2 through a resistor R15 and is connected to a pin 29 of the AD sampling chip U2 through a resistor R55.
Furthermore, the signal blocking circuit is controlled by a capacitor C9, and an output signal of the signal blocking circuit is pulled down to the ground through a resistor R9. In this embodiment, the semiconductor laser ranging simulation echo signal has a large direct current component, when a target at a longer distance is tested, the amplitude of the echo alternating current signal is small, the alternating current signal is smaller under comparison of the large direct current component, the rear-end single-end differential operational amplifier AD8138 and the differential input chip ADs9634 are limited by input thresholds, and the front end performs signal blocking, so that the amplitude of the target echo signal can be reflected more intuitively, and signal processing at the rear end is facilitated.
Further, the differential operational amplifier U6 controls the differential output voltage and the common mode output voltage through two feedback loops consisting of a resistor R50 and a resistor R60, respectively. This architecture allows the output to be highly balanced over a wide frequency range without the need for closely matched external components. The common mode feedback loop forces the signal component in the output common mode voltage to zero, and as a result, almost perfect balanced differential output is obtained, the amplitudes are completely equal, and the phase difference is 180 degrees.
Further, the differential operational amplifier U6 is a single-ended to differential operational amplifier AD 8138. In this embodiment, the single-ended to differential operational amplifier AD8138 does not need to use a transformer to drive an ADC having high performance, retains low-frequency and dc information, has good distortion performance and fast overload recovery characteristics, and can ensure sampling accuracy.
Further, the differential operational amplifier U6 includes 8 pins.
Further, the AD sampling chip U2 is a differential input chip ADs 9634.
Furthermore, the AD sampling chip U2 includes 32 pins, the 1, 2, 4~7, 9~24 pins of AD sampling chip U2 connect the pin of FPGA to by FPGA control its input, output state, the 27, 28, 31, 32 pins of AD sampling chip U2 connect the analog power positive pole, the 7, 8, 17 pins of AD sampling chip U2 connect the digital power positive pole. When the front end differential drive is performed, the AD sampling chip U2 with high sampling rate and high dynamic performance, namely the differential input chip ADS9634, has the best performance and the minimum distortion, and can nearly perfectly restore the analog signal waveform.
Furthermore, when the semiconductor laser range finder measures the distance, laser is sent to a measured target, echo reflection is carried out, photoelectric conversion is carried out through a receiving circuit to laser echo analog signals, the laser echo analog signals are discretized through a signal processing circuit, and then the discrete signals are collected and processed through an FPGA main control circuit. In order to restore the echo analog signal without distortion, a signal processing circuit with good performance is needed for signal conditioning, and a signal processing circuit system with excellent performance is provided.
According to the invention, a single-end-to-differential signal processing circuit is formed by adopting a single-end-to-differential operational amplifier AD8138 and a high-sampling-rate differential input chip ADS9634, so that output gain and phase matching balance can be provided, even order harmonics are inhibited to a certain extent, the signal acquisition quality is improved, and the ADC performance is optimized;
the invention mainly provides a signal processing circuit system with excellent performance, wherein laser echo analog signals are discretized through a signal processing circuit, then the FPGA main control circuit collects and processes the discrete signals, and the signal processing circuit with excellent performance is required for signal conditioning in order to restore the echo analog signals without distortion.
In summary, the signal processing circuit suitable for high-precision laser ranging overcomes the problems of the signal processing circuit in the existing digital laser ranging system, can restore the waveform of the echo analog signal without distortion, effectively improves the measuring range and precision of the semiconductor laser ranging machine, and can be better and widely applied to the semiconductor laser ranging machine.
The principal features, principles and advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as expressed in the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A signal processing circuit suitable for high-precision laser ranging is characterized in that: the device comprises a signal blocking circuit positioned at the front end, a single-end to differential signal processing circuit positioned in the middle and an A/D sampling circuit positioned at the rear end, wherein the signal blocking circuit, the single-end to differential signal processing circuit and the A/D sampling circuit are sequentially connected;
the single-end-to-differential signal processing circuit comprises a differential operational amplifier U6, a matching resistor R51, a matching resistor R53, a resistor R58, a resistor R59, a resistor R60, a resistor R50, a resistor R1 and a resistor R2, wherein a pin 1 of the differential operational amplifier U6 is connected with the matching resistor R6 and then grounded, a pin 1 of the differential operational amplifier U6 is connected with a pin 4 of the differential operational amplifier U6 through the resistor R6 and then connected with a pin 4 of the differential operational amplifier U6, a pin 8 of the differential operational amplifier U6 is connected with an echo analog signal after being blocked by a signal blocking circuit after being connected with the matching resistor R6, a pin 8 of the differential operational amplifier U6 is also connected with a pin 5 of the differential operational amplifier U6 through the resistor R6, a pin 2 of the differential operational amplifier U6 is connected with an operational circuit consisting of the resistor R6 and the resistor R6, the resistor R6 is connected with a capacitor C6 in parallel with a capacitor C6 and a filter circuit, and a differential operational amplifier U6 are connected with a voltage divider circuit and a differential operational amplifier U36, The resistor R2 is used for impedance matching;
the A/D sampling circuit comprises a resistor R52, a resistor R4, a resistor R3, a resistor R55, a resistor R7, a resistor R15, a capacitor C4 and an AD sampling chip U2, wherein one end of the resistor R52 is connected to the output end of the resistor R1, the other end of the resistor R52 is connected to a pin 26 of the AD sampling chip U2 through a resistor R7, is connected to a pin 30 of the AD sampling chip U2 through a resistor R4, and is grounded through a capacitor C4, one end of the resistor R3 is connected to the output end of the resistor R2, and the other end of the resistor R3 is connected to a pin 26 of the AD sampling chip U2 through a resistor R15 and is connected to a pin 29 of the AD sampling chip U2 through a resistor R55.
2. The signal processing circuit for high precision laser ranging according to claim 1, wherein: when the semiconductor laser range finder is used for ranging, laser is applied to a measured target, echo reflection is carried out, photoelectric conversion is carried out through the receiving circuit to obtain laser echo analog signals, the laser echo analog signals are discretized through the signal processing circuit, and then the discrete signals are collected and processed through the FPGA main control circuit.
3. The signal processing circuit for high precision laser ranging according to claim 1, wherein: the differential operational amplifier U6 is a single-ended to differential operational amplifier AD 8138.
4. A signal processing circuit suitable for high precision laser ranging according to claim 3, wherein: the differential op-amp U6 includes 8 pins.
5. The signal processing circuit for high precision laser ranging according to claim 1, wherein: the AD sampling chip U2 is a differential input chip ADs 9634.
6. The signal processing circuit for high precision laser ranging according to claim 5, wherein: the AD sampling chip U2 comprises 32 pins, pins 1, 2, 4-7 and 9-24 of the AD sampling chip U2 are connected with the pins of the FPGA, the input and output states of the FPGA are controlled by the FPGA, pins 27, 28, 31 and 32 of the AD sampling chip U2 are connected with the anode of an analog power supply, and pins 7, 8 and 17 of the AD sampling chip U2 are connected with the anode of a digital power supply.
7. The signal processing circuit for high precision laser ranging according to claim 1, wherein: the signal blocking circuit is controlled by a capacitor C9, and an output signal of the signal blocking circuit is pulled down to be grounded through a resistor R9.
8. The signal processing circuit for high precision laser ranging according to claim 1, wherein: the differential operational amplifier U6 controls the differential output voltage and the common mode output voltage respectively through two feedback loops consisting of a resistor R50 and a resistor R60.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010467808.6A CN111487605A (en) | 2020-05-28 | 2020-05-28 | Signal processing circuit suitable for high-precision laser ranging |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010467808.6A CN111487605A (en) | 2020-05-28 | 2020-05-28 | Signal processing circuit suitable for high-precision laser ranging |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589029A (en) * | 2021-08-23 | 2021-11-02 | 天津津航计算技术研究所 | DC270V voltage conditioning and collecting circuit based on operational amplifier |
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2020
- 2020-05-28 CN CN202010467808.6A patent/CN111487605A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589029A (en) * | 2021-08-23 | 2021-11-02 | 天津津航计算技术研究所 | DC270V voltage conditioning and collecting circuit based on operational amplifier |
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