CN2169142Y - Supersonic distance gauge - Google Patents
Supersonic distance gauge Download PDFInfo
- Publication number
- CN2169142Y CN2169142Y CN 93223143 CN93223143U CN2169142Y CN 2169142 Y CN2169142 Y CN 2169142Y CN 93223143 CN93223143 CN 93223143 CN 93223143 U CN93223143 U CN 93223143U CN 2169142 Y CN2169142 Y CN 2169142Y
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- wave
- pulse signal
- microcomputer
- amplifier
- modulator
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Abstract
The utility model provides an ultrasonic distance measurer. The utility model is characterized in that an emitted wave is a pulse signal wave which is composed of a plurality of square envelope pulse waves and has time-sequence character. The repetition period and the pulse width of each square envelope pulse wave are preset. A microcomputer only gates signals which have time-sequence character. The proposal does not have threshold level. The comprehensive performance indexes, of resolution capability, detection capability, accuracy, etc., of distance measurement are improved a lot. For example, when noise in the machine is 0.25 microvolt, the maximal measured distance can be 350 meters.
Description
The utility model relates to a kind of system that utilizes hyperacoustic reflection measurement distance.
Supersonic sounding or pulsed radar range finding all are as modulated wave with square profiled pulses modulating wave, launch to measured target by transmitter, reflection wave is received by receiver, to measured target round trip required cycle length, determines the distance of target according to ultrasound wave self-emission device.Be accurately to measure distance, require the resolution of ultrasonic measurement to want high, promptly cycle length the measuring accuracy height; For realizing remote range finding, require detectivity strong; Also require the accuracy of measurement height simultaneously, thoroughly eliminate the influence of noise jamming, realize eliminating the false and retaining the true.
Be to improve the combination property of supersonic range finder, people have proposed many improvement projects, develop the distance measuring equipment of better performances, but the progress of not making a breakthrough property as yet so far, are always attending to one thing and lose sight of another aspect its performance index improving, and the result is still undesirable.
Jap.P. JP60-27875 provides a kind of dipulse ranging scheme, adopt two pulse producers, one of them produces the broad pulse modulating wave, and another produces the burst pulse modulating wave, with totalizer two kinds of pulses of width is synthesized wideer pulse then and is used for emission; A divider is set in receiving circuit, composite pulse is decomposed into broad pulse and the burst pulse of original repetition period again, and carry out detection respectively.This scheme to closely with distant object the measurement appropriate signal of contrasting handle resolution characteristic when having improved close-in measurement and the detectivity when having strengthened telemeasurement.The defective of this scheme is that measuring error is bigger, and in receiving loop, through the signal after the envelope detection, its waveform rising front slows down, so be difficult to determine the accurate moment of echo arrival; Threshold level with certain potentials value is set in comparator circuit for this reason, is used to eliminate the clutter influence, but, must cut the part of signal waveform rising front, cause measuring error thus because threshold level exists.If the potential value of threshold level is too small, then noise signal can be thought by mistake be echoed signal, and cause bigger measuring error.
Jap.P. JP62-235587 discloses a kind of design proposal of pulsed radar, is a kind of improvement to the JP60-27875 scheme, as shown in Figure 1, and (A among the figure
1) be transmitted waveform, (A
2) be echo waveform, (A
3) be the echo threshold level value synoptic diagram constantly that arrives.This scheme adopts electronegative potential threshold level m
1, in receiving trap, adopt two parallel detector circuits, as the envelope detection loop of major loop at electronegative potential m
1The time, can detect the moment that echo arrives as soon as possible, this envelope detection loop delay phenomenon that has no time; Could export when having only the signal of inspection as the synchronous detection loop of subsidiary loop, otherwise not output, this free delay phenomenon in synchronous detection loop.Two kinds of detection results are imported microcomputer respectively, and when two kinds of detections all had output, microcomputer assert that the moment that the envelope detection signal of major loop arrives is t
1, and the t constantly that clutter can not arrived
nMisdeem and be t
1This scheme has reduced threshold level, has improved the accuracy of range finding.But have threshold level to exist equally, and can not accurately measure the moment that echo arrives, measuring error is still bigger, and is can detected target range also quite limited.
Above-mentioned two kinds of schemes, its threshold level value is shown in Fig. 1 (A
3), the former is taken as m at the threshold level value
2, corresponding echo arrives and gets t constantly
2, latter's threshold level value is got m
1, corresponding echo arrives and gets t constantly
1The latter is better than the former.The t constantly because echo arrives
1Or t
2All in starting point place value away from the echoed signal forward position, cause existing supersonic range finder comprehensive technical performance index to be difficult to improve, its basic reason is to lack the best approach of thorough elimination noise jamming, and promptly reaching the echo arrival is at the ideal state that approaches starting point place, envelope waveform forward position value constantly.
The purpose of this utility model is to provide a kind of brand-new supersonic range finder, its transmitted wave comprises a plurality of square profiled pulses ripples and constitutes the pulse signal wave with temporal aspect, and each square its repetition period of profiled pulses ripple and pulse width are given earlier and being set, deposit the information in the random memory ram in, microcomputer is only to having the signal identification extraction of temporal aspect.Thereby thoroughly remove the influence of environment clutter, exempt to establish threshold level, making echo arrival value constantly be positioned at approximation signal waveform forward position starting point becomes a reality, under the condition of equal emissive power, make the integrated performance indexs such as resolution characteristic, detectivity, accuracy of supersonic sounding obtain to improve to greatest extent.
The design's supersonic range finder, employing has the transmitted wave of temporal aspect, this temporal aspect is applied in the whole receiving loop, microcomputer only can identification extraction to the information that possesses temporal aspect, otherwise do not extract without exception, promptly the false signal that the environment clutter is produced is removed without exception, makes clutter not produce any influence to the range finding result.
The design's supersonic range finder, as shown in Figure 2, comprise microcomputer 1, carrier generator 2, pulse signal wave producer 3, modulator 4, amplifier 5, transmitter F, receiver F ', bandpass amplifier 6, wave detector 7, reshaper 8, random memory ram 9, timer 10, range display 11, it is characterized in that carrier generator 2, the input end of pulse signal the wave producer 3 and input end that carrier wave and pulse signal wave synthesize the modulator 4 of the modulated wave with temporal aspect connect microcomputer 1 respectively, 2 input ends in addition of modulator 4 are connected with the output terminal of carrier generator 2 with pulse signal wave producer 3 respectively, and the modulated wave of its output send transmitter F to launch after amplifier 5 amplifies; The output of receiver F ' is connected with random memory ram 9 by bandpass amplifier 6, wave detector 7, reshaper 8 successively.
Fig. 4 is the working routine service chart of microcomputer 1.Microcomputer sends control signal to modulator 4 after finishing initialization: emission temporal aspect pulse ultrasonic wave (P
1), the timer 10 (P that picks up counting simultaneously
2), receiving circuit receives echoed signal (P
3), this process is performed until and finishes one-shot measurement period T, this period T and give earlier and setting, and turns back to (P then
1), (P
2), otherwise be back to (P
3).Signal and noise enter into detector circuit 7 and judge (P in the received signal process
4) if detection has output, then output information is stored in (P among the RAM9
6), feature is removed noise the gating (P that promptly finishes signal with signal extraction chronologically then
7), the signal that extracts is delivered to display 11 range of a signal (P through Microcomputer Calculation with the result
8).Will be if signal gating does not have output through whether reaching the judgement of finishing the one-shot measurement period T.
With prior art relatively, the present invention has the following advantages:
1. adopt the transmitted wave with temporal aspect, microcomputer is only handled the signal gating with temporal aspect simultaneously, and the false signal that the environment clutter is produced gating is not without exception thoroughly eliminated the clutter influence, has improved the accuracy of measuring effectively;
2. have in the transmitted wave of temporal aspect, contain width profiled pulses ripple simultaneously, unit is taken into account remote range finding and closely range finding well;
3. owing to adopt transmitted wave, add and cancelled threshold level, realized that in other words threshold level approaches zero point, be applied to have very high measurement resolution characteristic when closely finding range with temporal aspect; When being applied to find range at a distance, under equal emissive power condition, measuring distance can improve more than 5 times, as excited frequency is 20～40KHz/S, when transmitter and receiver united two into one, finding range was greater than 150 meters in atmosphere, and the finding range of prior art this moment is less than 30 meters;
4. application present technique can be carried out fruitful detection to hyperacoustic feeble signal, makes ultrasound wave testing weak signals instrument;
5. can directly use microcomputer and produce carrier wave, pulse signal wave, synthetic modulated involving and carry out input, give full play to the effect of microcomputer, be beneficial to and simplify circuit and improve performance, can reduce cost 50% simultaneously.
Description of drawings:
Fig. 1 is existing transmitted wave waveform (A
1), echo waveform (A
2), the echo value (A constantly that arrives
3) figure.Ordinate is the time for the voltage horizontal ordinate among the figure, S-signal, N-clutter, m
1, m
2-threshold level, t
1, t
2-echo arrives constantly, t
n-clutter arrives constantly, t
o-initial the moment.
Fig. 2 is the supersonic range finder structural representation.
Fig. 3 is the transmitted wave waveform (B with temporal aspect
1), echo waveform (B
2), waveform (B after the detection
3), waveform (B after the shaping
4), microcomputer identification and the waveform (B that extracts
5) aspect graph, the A among the figure, B, B ', C are modulated waveform and corresponding signal waveform thereof, N is the clutter waveform, S
A, S
B, S
B ', S
CBe corresponding echoed signal waveform, T
1, T
2, T
3The repetition period of the profiled pulses in one transmitted wave, T '
1, T '
2, T '
3Be each envelope modulation ripple repetition period of echo, t
o, t
rBeing respectively the initial moment of transmitted wave and echo arrives constantly.
Fig. 4 is the working plan of this programme microcomputer, P among the figure
1～P
8Program mark for each operation phase.
Embodiment:
A kind of structure supersonic range finder as shown in Figure 2, wherein microcomputer 1 comprises 80C31,27C32,74HC373, Unit 8253, modulator 4 adopts SN74H78, amplifier 5 adopts the IRF450VMOS pipe, transmitter F, two combine into one for receiver F ', adopt 30KC/S piezoelectric ceramic ultrasound transducer, bandpass amplifier 6 is MC14573, reshaper 8 is CD4081, carrier generator 2, pulse signal wave producer 3, modulator 4 are by system controlled by computer, and carrier generator 2 is imported the pin of termination unit 8253
The pin of pulse signal wave producer 3 input termination 80C31 3., 3. 5. the pin of modulator 4 connect the 80C31 pin, 3., 4. its other 2 input ends carry the output terminal of wave producer 2 and pulse signal wave producer 3 respectively, 1. modulator 4 output terminals connect amplifier 5 input ends, the output termination 80C31 pin of reshaper 8
, miscellaneous part connects in the usual way, and excited frequency is 30KHz/S, and modulated wave constitutes the pulse signal wave with temporal aspect by 4 square profiled pulses ripple A, B, B ', C, and waveform morphology is seen Fig. 3, sets repetition period T
1=8ms, T
2=4ms, T
3=11ms, pulse width is respectively 1ms, 0.2ms, 0.2ms, 0.4ms.
When in atmosphere, making 5 meters distance rangings, resolution 0.08%, error≤± 1cm; When doing remote the range finding, 150 meters of target ranges, accuracy 0.2%, maximum measuring distance is 200 meters.
Claims (1)
1, a kind of supersonic range finder comprises microcomputer 1, carrier generator 2, and pulse signal wave producer 3, modulator 4, amplifier 5, transmitter F constitutes emitter; Receiver F ', bandpass amplifier 6, wave detector 7, reshaper 8, random memory ram 9, timer 10 and range display 11 wherein constitute emitter by microcomputer 1, carrier generator 2, pulse signal wave producer 3, modulator 4, amplifier 5, transmitter F; Constitute receiving trap by receiver F ', bandpass amplifier 6, wave detector 7, reshaper 8, random memory ram 9, it is characterized in that: the input end of carrier generator 2, pulse signal the wave producer 3 and input end that carrier wave and pulse signal wave synthesize the modulator 4 of the modulated wave with temporal aspect connect microcomputer 1 respectively, 2 input ends in addition of modulator 4 are connected with the output terminal of carrier generator 2 with pulse signal wave producer 3 respectively, and its output signal is sent transmitter F emission after amplifier 5 amplifies; The output of receiver F ' is connected with random memory ram 9 by bandpass amplifier 6, wave detector 7, reshaper 8 successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93223143 CN2169142Y (en) | 1993-09-03 | 1993-09-03 | Supersonic distance gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93223143 CN2169142Y (en) | 1993-09-03 | 1993-09-03 | Supersonic distance gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2169142Y true CN2169142Y (en) | 1994-06-15 |
Family
ID=33801548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93223143 Expired - Fee Related CN2169142Y (en) | 1993-09-03 | 1993-09-03 | Supersonic distance gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2169142Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101870A (en) * | 2014-05-27 | 2014-10-15 | 浙江工商大学 | Frequency domain modulation type ultrasonic distance measuring system frequency inflection point judging method |
| US10452157B2 (en) | 2014-10-07 | 2019-10-22 | Xyz Interactive Technologies Inc. | Device and method for orientation and positioning |
-
1993
- 1993-09-03 CN CN 93223143 patent/CN2169142Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101870A (en) * | 2014-05-27 | 2014-10-15 | 浙江工商大学 | Frequency domain modulation type ultrasonic distance measuring system frequency inflection point judging method |
| CN104101870B (en) * | 2014-05-27 | 2016-06-22 | 浙江工商大学 | A kind of frequency domain modulation formula ultrasonic ranging system frequency inflection point method of discrimination |
| US10452157B2 (en) | 2014-10-07 | 2019-10-22 | Xyz Interactive Technologies Inc. | Device and method for orientation and positioning |
| US10996768B2 (en) | 2014-10-07 | 2021-05-04 | Xyz Interactive Technologies Inc. | Device and method for orientation and positioning |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |