CN111510145B - Direct acquisition circuit applied to laser guidance - Google Patents
Direct acquisition circuit applied to laser guidance Download PDFInfo
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- CN111510145B CN111510145B CN202010332745.3A CN202010332745A CN111510145B CN 111510145 B CN111510145 B CN 111510145B CN 202010332745 A CN202010332745 A CN 202010332745A CN 111510145 B CN111510145 B CN 111510145B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
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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
- G01S7/4863—Detector arrays, e.g. charge-transfer gates
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Abstract
Be applied to direct circuit of adopting of laser guidance includes: the device comprises a photoelectric conversion device, a band-pass filtering device, a differential conversion device, an analog-to-digital conversion device and a gate array chip, wherein the photoelectric conversion device, the band-pass filtering device, the differential conversion device, the analog-to-digital conversion device and the gate array chip are sequentially connected. The direct sampling circuit applied to laser guidance has the following advantages that the problem of guidance precision caused by errors generated by analog digital sampling is avoided; the diameter of the circuit board is reduced, and the problem of sampling error caused by occasional burrs at the edge of a wave gate generated in an analog summation mode is solved; the sampling noise is suppressed, and the sampling precision is improved; the signal-to-noise ratio is improved, and the guidance precision is improved.
Description
Technical Field
The invention relates to the field of laser guidance, in particular to a direct sampling circuit applied to laser guidance.
Background
The laser seeker generally adopts a four-quadrant detector as a laser energy sensitive device, the pulse width of four paths of signals output by the detector is about 10ns, the existing strapdown laser seeker generally adopts a structure of a peak value holder + a low-speed AD + a main processor, the peak value holder is used for sampling and holding four paths of narrow pulse signal peak values so as to meet the requirement of a low-speed AD sampling rate, the peak value holder built or customized by an operational amplifier is used, and due to the influence of chip technology and analog device drift, high consistency of four-path signal sampling and holding cannot be achieved, so that the signal peak values after sampling and holding and the original laser energy peak values have errors, and finally, angle resolving errors exist, and guidance precision is reduced.
Therefore, the problems of the prior art are to be further improved and developed.
Disclosure of Invention
The object of the invention is: in order to solve the problems in the prior art, the invention aims to provide a direct sampling circuit which is applied to laser guidance and improves the guidance precision.
The technical scheme is as follows: in order to solve the above technical problem, the present technical solution provides a direct sampling circuit applied to laser guidance, including:
the photoelectric conversion device is used for receiving laser echo energy, completing photoelectric conversion on the laser echo energy and outputting a laser pulse signal;
the band-pass filter device is used for filtering laser pulse signal direct current bias and high-frequency noise;
the differential conversion device is used for realizing the conversion of the single-end pulse signal and the differential pulse signal;
the analog-to-digital conversion device is used for receiving the differential pulse signal and completing analog-to-digital conversion of the differential pulse signal;
the gate array chip is used for carrying out analog-to-digital conversion on the differential pulse signal of the single-ended pulse conversion, generating a gate signal and calculating azimuth and pitch yaw angle data;
the photoelectric conversion device, the band-pass filter device, the differential conversion device, the digital-to-analog conversion device and the gate array chip are connected in sequence.
The direct sampling circuit applied to laser guidance further comprises an on-missile controller, and the on-missile controller is connected with the gate array chip.
The direct sampling circuit applied to laser guidance is characterized in that the gate array chip comprises a sampling resolving module, a summing comparison module and a communication module,
the sampling calculation module samples the differential pulse signals, performs analog-to-digital conversion to obtain signal digital quantity, and calculates azimuth and pitch yaw angle data;
the summation comparison module sums the signal digital quantity to generate a wave gate signal;
the communication module completes communication between the gate array chip and the pop-up controller.
The direct sampling circuit applied to laser guidance is characterized in that the sampling resolving module comprises a sampling analog-to-digital converter, and the sampling analog-to-digital converter is used for performing analog-to-digital conversion on sampled pulse signals.
The direct sampling circuit applied to laser guidance is characterized in that the communication module is CAN communication.
The direct-sampling circuit applied to laser guidance is characterized in that the photoelectric conversion device is a four-quadrant detector.
The direct sampling circuit applied to laser guidance is characterized in that the band-pass filter device is a band-pass filter.
The direct sampling circuit applied to laser guidance is characterized in that the differential conversion device is a single-ended-differential converter.
The direct sampling circuit applied to laser guidance is characterized in that the gate array chip is an FPGA chip.
The direct sampling circuit applied to laser guidance is characterized in that the analog-to-digital conversion device is a differential high-speed ADC
(III) the beneficial effects are as follows: the direct sampling circuit applied to laser guidance provided by the invention has the following advantages,
based on the concept of rapid digitization of analog signals, the problem that the traditional hardware architecture is influenced by inconsistency of four channels of a peak value retainer, errors are generated on analog mode digital sampling, and finally the guidance precision is reduced is solved;
the wave gate is generated by using a software summation comparison mode, so that the diameter of the circuit board is reduced, and the problem of mistaken sampling caused by occasional burrs on the edge of the wave gate generated by an analog summation mode is solved;
the width of a sampling wave gate is accurately controlled by using a clock of the FPGA, and the wave gate is dynamically shrunk according to the noise and the effective signal position, so that the sampling noise is suppressed, and the sampling precision is improved;
the differential AD can inhibit the common mode noise of the circuit, improve the signal-to-noise ratio and improve the guidance precision.
Drawings
FIG. 1 is a schematic diagram of a direct current acquisition circuit connection structure for laser guidance according to the present invention;
fig. 2 is a schematic diagram of a preferred embodiment of the direct current generation circuit applied to laser guidance.
Detailed Description
The present invention will be described in further detail with reference to preferred embodiments, and more details are set forth in the following description in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from the description herein and can be similarly generalized and deduced by those skilled in the art based on the practical application without departing from the spirit of the present invention, and therefore, the scope of the present invention should not be limited by the contents of this detailed embodiment.
The drawings are schematic representations of embodiments of the invention, and it is noted that the drawings are intended only as examples and are not drawn to scale and should not be construed as limiting the true scope of the invention.
The following is a description of a preferred embodiment of an image inverting tube based true color image intensifier based on a microlens array according to the present application.
As shown in fig. 1, the direct sampling circuit applied to laser guidance includes a photoelectric conversion device, a band-pass filter device, a differential conversion device, an analog-to-digital conversion device, a gate array chip and an on-board controller.
The photoelectric conversion device, the band-pass filter device, the differential conversion device, the analog-to-digital conversion device, the gate array chip and the missile-borne controller are connected in sequence.
The photoelectric conversion device is used for receiving laser echo energy, completing photoelectric conversion of the laser echo energy and outputting a laser pulse signal.
And the band-pass filtering device is used for filtering laser pulse signal direct current bias and high-frequency noise.
The differential conversion device is used for realizing the conversion of the single-end pulse signal and the differential pulse signal.
The analog-to-digital conversion device is used for receiving the differential pulse signal and completing analog-to-digital conversion of the differential pulse signal.
The gate array chip is used for carrying out analog-to-digital conversion on the differential pulse signal of the single-ended pulse conversion, generating a wave gate signal and calculating azimuth and pitching yaw angle data.
And the missile-borne controller tracks the position of a target according to the yaw angle calculated by the seeker.
The gate array chip comprises a sampling calculation module, a summation comparison module and a communication module. The sampling calculation module samples the single-end-to-differential pulse signal, performs analog-to-digital conversion to obtain a signal digital quantity, and calculates azimuth and pitch yaw angle data.
The summation comparison module sums the digital quantity of the four-channel pulse signal, software sets a comparison voltage which is larger than the noise sum and smaller than the effective sum signal according to the sampling noise and the peak value of the four-channel sum signal, when the sampling sum signal is larger than the noise value, the gate array controls the general IO to output a high level, and when the sampling value is smaller than the input set value, the gate array outputs a low level to generate a gate signal. The communication module completes communication between the gate array chip and the pop-up controller.
As shown in fig. 2, the photoelectric conversion device is a four-quadrant detector; the band-pass filter device is a band-pass filter; the differential conversion device is a single-ended-differential converter, which can use ADA4932-2 YCPZ; the analog-to-digital conversion device is a differential high-speed ADC, and can specifically use an analog-to-digital converter ADS 4449; the gate array chip is an FPGA chip, and specifically, ZYNQ series xc7Z010 of Xilinx can be used.
The sampling resolving module comprises a sampling analog-to-digital converter which performs analog-to-digital conversion on the sampled pulse signals.
The communication module is CAN communication.
The circuit adopts a digital summation mode, utilizes digital quantity summation after analog-to-digital conversion, sets comparison voltage in software, controls the general IO of the FPGA to generate a wave gate signal when a sampling value is greater than the comparison voltage, the edge of the wave gate generated by the mode is clean and steep, and the specific implementation steps of controlling AD accurate sampling are as follows:
when a first period of laser echo signals arrives:
1) sampling four-channel pulse signals, and summing digital quantities;
2) according to the sampling noise peak value and the pulse and signal peak value, the software sets a comparison voltage which is larger than the noise sum and smaller than the pulse signal sum;
3) when the sampling sum signal is greater than the noise value, the gate array controls the general IO to output a high level, and when the sampling value is less than a set value, the gate array outputs a low level to generate a gate signal;
4) the laser pulse is a periodic sequence, and a wave gate of the periodic sequence is generated at fixed time according to the edge of a first wave gate signal;
5) and controlling subsequent laser pulse sampling in the wave gate to realize noise suppression.
The following describes specific implementation steps with reference to the present embodiment,
the four-quadrant detector receives laser echo energy to complete photoelectric conversion, and outputs a laser pulse signal with a four-channel pulse width of about 10 ns;
the band-pass filter is mainly used for designing parameters of the band-pass filter according to a laser pulse frequency band and filtering direct current offset and high-frequency noise;
the single-ended-differential converter converts the single-ended pulse signal into a differential pulse signal for subsequent differential high-speed ADC (analog-to-digital converter) to sample, and the anti-interference performance can be improved by using the differential pulse signal;
the differential high-speed ADC has the main function of receiving differential pulse signals to complete analog-to-digital conversion; the sampling analog-to-digital converter selects a four-channel parallel sampling analog-to-digital converter ADS4449 with the resolution of 14 bits and the sampling rate of 250MSPS, and can directly sample the original pulse signal, wherein the differential high-speed ADC performs analog-to-digital conversion to suppress circuit common-mode interference and improve the sampling accuracy;
the summation comparison module mainly generates a sampling gate signal to control the AD to sample in a gate range, a digital summation mode is adopted, digital quantity summation after analog-to-digital conversion is utilized, comparison voltage is set in software, when the sampling value is larger than the comparison voltage, the general IO of the FPGA is controlled to generate the gate signal, the edge of the gate generated by the mode is clean and steep, and the AD can be controlled to sample accurately;
the sampling resolving module controls the four channels AD to complete analog-to-digital conversion, and resolves the azimuth and the pitching yaw angle according to the converted digital quantity;
the CAN communication is mainly used for completing the communication with the on-missile controller and sending the yaw angle to the on-missile controller;
and the missile-borne controller tracks the position of the target according to the yaw angle calculated by the seeker.
The direct sampling circuit applied to laser guidance is based on the idea of analog signal rapid digitization, and solves the problems that a traditional hardware framework is affected by the inconsistency of four channels of a peak value retainer, an error is generated in analog mode digital sampling, and finally guidance precision is reduced;
the wave gate is generated by using a software summation comparison mode, so that the diameter of the circuit board is reduced, and the problem of mistaken sampling caused by occasional burrs on the edge of the wave gate generated by an analog summation mode is solved;
the width of a sampling wave gate can be accurately controlled by using the FPGA clock, and the wave gate is dynamically shrunk according to the noise and the effective signal position, so that the sampling noise is suppressed, and the sampling precision is improved;
the differential AD can inhibit the common mode noise of the circuit, improve the signal-to-noise ratio and improve the guidance precision.
The above description is provided for the purpose of illustrating the preferred embodiments of the present invention and will assist those skilled in the art in more fully understanding the technical solutions of the present invention. However, these examples are merely illustrative, and the embodiments of the present invention are not to be considered as being limited to the description of these examples. For those skilled in the art to which the invention pertains, several simple deductions and changes can be made without departing from the inventive concept, and all should be considered as falling within the protection scope of the invention.
Claims (7)
1. Be applied to circuit is adopted directly of laser guidance, its characterized in that includes:
the photoelectric conversion device is used for receiving laser echo energy, completing photoelectric conversion on the laser echo energy and outputting a laser pulse signal;
the band-pass filter device is used for filtering laser pulse signal direct current bias and high-frequency noise;
the differential conversion device is used for realizing the conversion of the single-end pulse signal and the differential pulse signal;
the analog-to-digital conversion device is used for receiving the differential pulse signal and completing analog-to-digital conversion of the differential pulse signal;
the gate array chip is used for carrying out analog-to-digital conversion on the differential pulse signal of the single-ended pulse conversion, generating a gate signal and calculating azimuth and pitch yaw angle data;
the photoelectric conversion device, the band-pass filtering device, the differential conversion device, the analog-to-digital conversion device and the gate array chip are connected in sequence;
the gate array chip comprises a sampling calculation module, a summation comparison module and a communication module, wherein the sampling calculation module is used for sampling the differential pulse signals, performing analog-to-digital conversion to obtain signal digital quantity and calculating azimuth and pitching yaw angle data; the summation comparison module sums the signal digital quantity to generate a wave gate signal; the communication module completes communication between the gate array chip and the pop-up controller; the sampling resolving module comprises a sampling analog-to-digital converter, and the sampling analog-to-digital converter is used for performing analog-to-digital conversion on the sampled pulse signals;
the summation comparison module receives a first period laser echo signal, and specifically comprises the following steps:
sampling four-channel pulse signals, and summing digital quantities;
according to the peak value of the sampling noise and the peak value of the pulse signal, software sets a comparison voltage which is greater than the sum of the noise and smaller than the sum of the pulse signal;
when the sampling sum signal is greater than the noise value, the gate array controls the general IO to output a high level, and when the sampling value is less than a set value, the gate array outputs a low level to generate a gate signal;
the laser pulse is a periodic sequence, and a wave gate of the periodic sequence is generated at fixed time according to the edge of a first wave gate signal;
subsequent laser pulse sampling is controlled within the wave gate.
2. The direct sampling circuit applied to laser guidance according to claim 1, further comprising an on-board controller, wherein the on-board controller is connected with the gate array chip.
3. The direct current sampling circuit applied to laser guidance according to claim 1, wherein the communication module is CAN communication.
4. The direct current collecting circuit applied to laser guidance according to claim 1, wherein the photoelectric conversion device is a four-quadrant detector.
5. The direct current sampling circuit applied to laser guidance according to claim 1, wherein the band-pass filter device is a band-pass filter.
6. The direct current circuit applied to laser guidance according to claim 1, wherein the differential conversion device is a single-ended-to-differential converter.
7. The direct sampling circuit applied to laser guidance according to claim 1, wherein the gate array chip is an FPGA chip.
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| CN114623733A (en) * | 2022-03-25 | 2022-06-14 | 西安雷神防务技术有限公司 | Method, device, system, equipment and medium for capturing laser seeker |
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| CN108020121A (en) * | 2017-11-17 | 2018-05-11 | 湖北航天飞行器研究所 | A kind of laser seeker energy management system and method |
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| CN101158590A (en) * | 2007-11-13 | 2008-04-09 | 长春理工大学 | Complete digitisation 4 quadrant detector detecting laser beam deflection angle device and method |
| CN108020121A (en) * | 2017-11-17 | 2018-05-11 | 湖北航天飞行器研究所 | A kind of laser seeker energy management system and method |
| CN109631673A (en) * | 2018-12-28 | 2019-04-16 | 北京航天飞腾装备技术有限责任公司 | Semi-active LASER detection method and system |
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