CN205787130U

CN205787130U - Ldms

Info

Publication number: CN205787130U
Application number: CN201620666741.8U
Authority: CN
Inventors: 崔炜; 严培辉; 陈磊; 王东旭; 赵爽; 陈帅坤
Original assignee: Changchun University of Science and Technology
Current assignee: Changchun University of Science and Technology
Priority date: 2016-06-29
Filing date: 2016-06-29
Publication date: 2016-12-07
Anticipated expiration: 2026-06-29

Abstract

The utility model proposes a kind of LDMS and include laser emission element, laser pick-off unit and signal processing unit, it is characterized in that: the modulated pulse signal that signal processing unit produces is amplified and produce pulsed laser signal by laser emission element, modulated pulse signal produces after amplifying launches signal；Launch signal to be detected by laser pick-off unit, and start counting up, described pulsed laser signal on testee through reflection after, detected by laser pick-off unit, signal is carried out pulse arrival time counting and mixing by laser pick-off unit respectively, wherein the value to pulse arrival time counting calculates and i.e. can get bigness scale distance, and the signal low-pass filter circuit after mixing filters out high fdrequency component, samples low frequency component signal the most again；Signal after sampling exports signal processing unit and processes, and obtains phase information, calculates accurate measurement distance by phase information, finally bigness scale distance and accurate measurement distance is added and obtains tested distance.

Description

LDMS

Technical field

This utility model relates to a kind of LDMS, is applied to industry, Aero-Space, military affairs, greatly Atmospheric Survey With fields such as roboticses.

Background technology

Along with the development of human society, people adjust the distance measure requirement more and more higher.From military space monitoring, war Scout, weapon guidance, the detection of the overlength distance celestial body such as the moon on astronomy, civilian on the detection of the earth landforms, not only detect Object is more diversified, and required precision is more and more higher.Along with laser technology, electronic technology, computer technology and integrated The development of optics, laser ranging technique has obtained developing rapidly, and LDMS based on this is the most just towards numeral The direction of change, automatization and miniaturization is developed.

This utility model is primarily directed to solve in pulsed laser ranging, the problem that range accuracy is the highest, it is proposed that a kind of LDMS.

Utility model content

The purpose of this utility model is to overcome above-mentioned deficiency present in prior art, and provides a kind of simple in construction, Reasonable in design, precision is high, and resolving power is high, and detection range is remote, and capacity of resisting disturbance is strong, and light source coherence is required low laser ranging System.

The technical scheme in the invention for solving the above technical problem is: this LDMS, including Laser emission Unit, laser pick-off unit and signal processing unit, it is characterised in that:

The modulated pulse signal that signal processing unit produces is amplified and produces pulse laser letter by described laser emission element Number, modulated pulse signal produces after amplifying launches signal；

Described transmitting signal is detected by laser pick-off unit, and starts counting up, and described pulsed laser signal is at measured object On body after reflection, being detected by laser pick-off unit, signal is carried out pulse arrival time meter by laser pick-off unit respectively Number and mixing, wherein the value to pulse arrival time counting calculates and i.e. can get bigness scale distance, and the letter after mixing Number filter out high fdrequency component with low-pass filter circuit, the most again low frequency component signal is sampled；

Signal after described sampling exports signal processing unit and processes, and obtains phase information, is believed by phase place Breath calculates accurate measurement distance, finally bigness scale distance and accurate measurement distance is added available tested distance.

Laser emission element described in the utility model includes modulated pulse signal generator, pulse driving circuit and laser Device, modulated pulse signal generator, pulse driving circuit and laser instrument be sequentially connected with, and wherein modulated pulse signal generator is letter One ingredient of number processing unit, modulated pulse signal generator sends modulated pulse signal and puts through pulse driving circuit Greatly, driving laser instrument to send laser firing signals, pulse driving circuit sends described transmitting signal after amplifying simultaneously.

Laser pick-off unit described in the utility model includes counting module, the first low-pass filter circuit, the second low-pass filtering Circuit, the first mixting circuit, the second mixting circuit, A/D sample circuit a 2nd A/D sample circuit and local oscillation signal produce electricity Road, described signal processing unit includes that phase discriminator, described transmitting signal flip-flop number module start counting up, when echo-signal arrives When coming, produce first via echo-signal and the second tunnel echo-signal, when first via echo-signal arrives counting module, flip-flop number Module stops counting, obtains thick lateral extent by the gate time of gained, and the second tunnel echo-signal produces circuit with local oscillation signal The local oscillation signal produced is mixed by the second mixting circuit, then filters out high fdrequency component by the second low-pass filter circuit, then Utilize the 2nd A/D sample circuit to sample, and finally transmit a signal to phase discriminator, the clock signal of counting module and basis The local oscillation signal that the signal generating circuit that shakes produces is mixed by the first mixting circuit, then is filtered out by the first low-pass filter circuit High fdrequency component, then utilizes an A/D sample circuit to sample, and finally transmits a signal to phase discriminator, phase discriminator Above-mentioned two paths of signals is carried out phase demodulation, obtains accurate measurement distance by phase contrast, accurate measurement distance is added with above-mentioned thick lateral extent Obtain tested distance.

This utility model also includes avalanche photodide, pre-amplification circuit, main amplifying circuit and constant ratio moment mirror Other circuit, pulsed laser signal reflects on measured object, and the weak echo signal reflected is by avalanche photodide Receive and convert optical signals into voltage signal, this voltage signal after pre-amplification circuit and main amplifying circuit amplify, this Time signal be referred to as echo-signal, echo-signal is divided into two-way, and constant ratio moment discrimination circuit of leading up to becomes the first via Echo-signal, first via echo-signal flip-flop number module stops counting, and another road signal in above-mentioned two-way echo-signal is i.e. It it is the second tunnel echo-signal.

This utility model compared with prior art, has the following advantages and effect: simple in construction, reasonable in design, and precision is high, Resolving power is high, and detection range is remote, and capacity of resisting disturbance is strong, requires low to light source coherence.

Accompanying drawing explanation

In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, the accompanying drawing in describing below is only It is embodiments more of the present utility model, for those of ordinary skill in the art, before not paying creative work Put, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the structured flowchart of the laser emission element in this utility model embodiment.

Fig. 2 is the structured flowchart of laser pick-off unit.

Fig. 3 is the system block diagram of LDMS.

Detailed description of the invention

The utility model is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following example are right Explanation of the present utility model and this utility model is not limited to following example.

Embodiment 1.

Seeing Fig. 1 to Fig. 3, the LDMS of the present embodiment includes laser emission element, laser pick-off unit and letter Number processing unit 1.

The modulated pulse signal that signal processing unit 1 produces is amplified and produces arteries and veins by the laser emission element in the present embodiment Impulse optical signal, modulated pulse signal produces after amplifying launches signal Se (t).

Launching signal Se (t) to be detected by laser pick-off unit, and start counting up, pulsed laser signal is on testee Through reflection after, detected by laser pick-off unit, laser pick-off unit signal is carried out respectively pulse arrival time counting and Mixing, wherein the value to pulse arrival time counting calculates and i.e. can get bigness scale distance, and the signal after mixing is used Low pass filter filters out high fdrequency component, samples low frequency component signal the most again；

Signal after sampling exports signal processing unit 1 and processes, and obtains phase information, by phase information meter Calculate accurate measurement distance, finally bigness scale distance and accurate measurement distance are added available tested distance.

As shown in figures 1 and 3, the laser emission element in the present embodiment includes that modulated pulse signal generator 2, pulse are driven Galvanic electricity road 3 and laser instrument 4, modulated pulse signal generator 2, pulse driving circuit 3 and laser instrument 4 are sequentially connected with, and wherein modulate Pulse signal generator 2 is an ingredient of signal processing unit 1, and modulated pulse signal generator 2 sends modulation pulse Signal amplifies through pulse driving circuit 3, drives laser instrument 4 to send pulsed laser signal, sends out after pulse driving circuit 3 amplifies simultaneously Go out to launch signal Se (t).

As shown in Figures 2 and 3, the laser pick-off unit in the present embodiment includes counting module the 5, first low-pass filter circuit 6, second low-pass filter circuit the 7, first mixting circuit the 8, second mixting circuit the 9, the oneth A/D sample circuit the 10, the 2nd A/D sampling Circuit 11 and local oscillation signal produce circuit 13, and signal processing unit 1 includes phase discriminator 12, launch signal Se (t) flip-flop number Module 5 starts counting up, and when echo-signal arrives, produces first via echo-signal S2r (t) and the second tunnel echo-signal S1r T (), when first via echo-signal S2r (t) arrives counting module 5, flip-flop number module 5 stops counting, by the counting of gained Time obtains thick lateral extent, and the second tunnel echo-signal S1r (t) and local oscillation signal produce local oscillation signal S (t) of circuit 13 generation and lead to Cross the second mixting circuit 9 to be mixed, then filter out high fdrequency component by the second low-pass filter circuit 7, then utilize the 2nd A/D sampling Circuit 11 is sampled, and finally transmits a signal to phase discriminator 12, clock signal clk of counting module 5 and local oscillation signal Local oscillation signal S (t) producing circuit 13 generation is mixed by the first mixting circuit 8, then is filtered by the first low-pass filter circuit 6 Fall high fdrequency component, then utilize an A/D sample circuit 10 to sample, and finally transmit a signal to phase discriminator 12, mirror Circuitry phase 12 carries out phase demodulation to above-mentioned two paths of signals, obtains accurate measurement distance by phase contrast, accurate measurement distance and above-mentioned thick side Distance is added and obtains tested distance.Clock signal clk of the second tunnel echo-signal S1r (t) and counting module 5 is due to frequency very Height, is unfavorable for that A/D samples, so first clock signal clk on the second tunnel echo-signal S1r (t) He counting module 5 to be entered respectively Row mixing, filters out high fdrequency component, the recycling A/D sample circuit low frequency signal to output by low-pass filter circuit the most again Sample.

Counting module the 5, first low-pass filter circuit the 6, second low-pass filtering electricity of the laser pick-off unit in the present embodiment Road the 7, first mixting circuit the 8, second mixting circuit the 9, the oneth A/D sample circuit the 10, the 2nd A/D sample circuit 11 and local oscillation signal Producing circuit 13 specifically to connect as shown in Figures 2 and 3, here is omitted.

When the present embodiment also includes avalanche photodide 14, pre-amplification circuit 15, main amplifying circuit 16 and constant ratio Carving discriminator circuit 17, pulsed laser signal reflects on measured object, and the weak echo signal reflected is by avalanche optoelectronic Diode 14 receives and converts optical signals into voltage signal, and this voltage signal is through pre-amplification circuit 15 and main amplifying circuit After 16 amplify, signal now is referred to as echo-signal, and echo-signal is divided into two-way, leads up to constant ratio moment discrimination circuit 17 become first via echo-signal S2r (t), and first via echo-signal S2r (t) flip-flop number module 5 stops counting, above-mentioned two-way Another road signal in echo-signal is the second tunnel echo-signal S1r (t).

This utility model advantages below and effect: simple in construction, reasonable in design, precision is high, and resolving power is high, detection range Far, capacity of resisting disturbance is strong, requires low to light source coherence.

Above content described in this specification is only to this utility model example explanation.This utility model Described specific embodiment can be made various amendment or supplements or use class by person of ordinary skill in the field As mode substitute, without departing from the content of this utility model description or surmount model defined in the claims Enclose, protection domain of the present utility model all should be belonged to.

Claims

1. a LDMS, including laser emission element, laser pick-off unit and signal processing unit, its feature exists In:

The modulated pulse signal that signal processing unit produces is amplified and produces pulsed laser signal by described laser emission element, adjusts Pulse signal processed produces after amplifying launches signal；

Described transmitting signal is detected by laser pick-off unit, and starts counting up, and described pulsed laser signal is on testee Through reflection after, detected by laser pick-off unit, laser pick-off unit signal is carried out respectively pulse arrival time counting and Mixing, wherein the value to pulse arrival time counting calculates and i.e. can get bigness scale distance, and the signal after mixing is used Low-pass filter circuit filters out high fdrequency component, samples low frequency component signal the most again；

Signal after described sampling exports signal processing unit and processes, and obtains phase information, by phase information meter Calculate accurate measurement distance, finally bigness scale distance and accurate measurement distance are added available tested distance.

LDMS the most according to claim 1, it is characterised in that: described laser emission element includes modulating pulse Signal generator, pulse driving circuit and laser instrument, modulated pulse signal generator, pulse driving circuit and laser instrument connect successively Connecing, wherein modulated pulse signal generator is an ingredient of signal processing unit, and modulated pulse signal generator sends Modulated pulse signal amplifies through pulse driving circuit, drives laser instrument to send laser firing signals, and pulse driving circuit is put simultaneously Described transmitting signal is sent after great.

LDMS the most according to claim 1, it is characterised in that: described laser pick-off unit includes count module Block, the first low-pass filter circuit, the second low-pass filter circuit, the first mixting circuit, the second mixting circuit, an A/D sampling electricity Road the 2nd A/D sample circuit and local oscillation signal produce circuit, and described signal processing unit includes phase discriminator, described transmitting signal Flip-flop number module starts counting up, when echo-signal arrives, and generation first via echo-signal and the second tunnel echo-signal, first When road echo-signal arrives counting module, flip-flop number module stops counting, obtains thick lateral extent by the gate time of gained, Second tunnel echo-signal and local oscillation signal are produced the local oscillation signal of circuit generation and are mixed by the second mixting circuit, then by second Low-pass filter circuit filters out high fdrequency component, then utilizes the 2nd A/D sample circuit to sample, and finally transmits a signal to Phase discriminator, the clock signal of counting module and local oscillation signal are produced the local oscillation signal of circuit generation and are mixed by the first mixting circuit Frequently, then filter out high fdrequency component by the first low-pass filter circuit, then utilize an A/D sample circuit to sample, and Transmitting a signal to phase discriminator eventually, phase discriminator carries out phase demodulation to above-mentioned two paths of signals, obtains accurate measurement distance by phase contrast, Accurate measurement distance is added with above-mentioned thick lateral extent and obtains tested distance.

LDMS the most according to claim 3, it is characterised in that: also include avalanche photodide, front storing Big circuit, main amplifying circuit and constant ratio moment discrimination circuit, pulsed laser signal reflects on measured object, reflects Weak echo signal received by avalanche photodide and convert optical signals into voltage signal, this voltage signal is through preposition After amplifying circuit and main amplifying circuit amplify, signal now is referred to as echo-signal, and echo-signal is divided into two-way, leads up to Constant ratio moment discrimination circuit becomes first via echo-signal, and first via echo-signal flip-flop number module stops counting, above-mentioned Another road signal in two-way echo-signal is the second tunnel echo-signal.