CN107037291A - A kind of system and method for being used to detecting and positioning 20kHz square-wave signals - Google Patents
A kind of system and method for being used to detecting and positioning 20kHz square-wave signals Download PDFInfo
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- CN107037291A CN107037291A CN201710310682.XA CN201710310682A CN107037291A CN 107037291 A CN107037291 A CN 107037291A CN 201710310682 A CN201710310682 A CN 201710310682A CN 107037291 A CN107037291 A CN 107037291A
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Abstract
The invention discloses a kind of system and method for being used to detecting and positioning 20kHz square-wave signals, system includes：L C oscillating circuit collectors circuit that 6 identicals are sequentially connected, hardware filtering and amplifying circuit, rectification circuit, singlechip group into circuit.Method comprises the following steps：1st, system is placed on around 20kHz square-wave signals；2nd, it will be filtered, amplified in the 20kHz square-wave signal input hardware filter circuits and amplifying circuit, rectification circuit that collect by system, rectification is handled.3rd, in the incoming single-chip microcomputer of result crossed hardware handles, by single-chip microcomputer filtering optimization data, and the position of 20kHz square-wave signals and the angle i.e. direction of signal radiation of signal are calculated.4th, result of calculation is exported by single-chip microcomputer lcd screen.It is an advantage of the invention that the position of 20kHz square-wave signals can intuitively, fast and accurately be detected, the efficiency for the work that tracks is improved.
Description
Technical field
The present invention relates to a kind of system and method for being used to detecting and positioning 20kHz square-wave signals, belong to analysis and measurement
Control technology field.
Background technology
At present, in many occasions such as institution of higher education during curriculum experiment, Electronic Design is competed, the inspection of 20kHz square-wave signals
Survey is a critically important content.Existing technology and detecting system design, under the interference of a variety of electromagnetic environments, because hardware
Inconsiderate with being filtered on Software for Design, there is distortion, the reception of interference signal and the survey of signal intensity in collection in signal
Amount, has influence on the effect of positioning；No display function can allow user intuitively to use positioning result after the positioning.For example,
Publication No. CN106602927A patent application discloses a kind of resonance square-wave synchronous clamper piezoelectric linear motor, including driving
Oscillator, clamper oscillator, optical axis, clamp system and pedestal.Drive vibrator and the clamper oscillator is made pottery by metal cantilever beams and piezoelectricity
Porcelain is constituted, and one direction linear motion is produced by the coordination driving optical axis between drive vibrator and clamper oscillator.According to square wave
Fourier transformation, square wave can obtain by the harmonic superposition of different frequency, different amplitude.The metal cantilever beams are using a series of
The method for increasing and decreasing material adjusts structure, and then reaches the ratio of preceding n first order modes intrinsic frequency being adjusted to 1:3:5 ... mesh
's.Drive vibrator and the clamper oscillator is just driven by the square-wave signal frequency synthesized for n ranks intrinsic frequency before piezoelectric vibrator.Example
Such as, Publication No. CN106597242A patent application discloses high-tension line insulation detection device.Including：In high-tension line not
Before upper high pressure, square-wave generator produces the square-wave signal that the cycle is 2T, and square-wave signal is input to RC oscillating circuits, in the height of square wave
Level duration makes electric capacity C charge, and electric capacity C is discharged in the low level duration of square wave；Voltage acquisition module is in square wave
The voltage Vk_high of K points between the first setting moment collection resistance R and electric capacity C of high level duration, and it is low in square wave
The second setting moment of level duration gathers the voltage Vk_low of K points, and Vk_high, Vk_low for collecting are sent to
Processor module；Processor module calculates Vk_high and Vk_low difference, according to the mathematic interpolation of the two insulating point to be detected
Insulating resistance value between ground connection platform, if insulating resistance value is less than preset security threshold value, high pressure is reported to alarm modules
Insulation fault.For example, a kind of passive mixing of voltage mode of Publication No. CN106603014A low power consumption and low cost High Linear
Device, is arranged on the signal path of radio-frequency transmitter, as the second frequency mixer in radio-frequency transmitter, is connected and set by circuit
Between the first frequency mixer and low pass filter, comprising two structure identical mixting circuits, by penetrating that the first frequency mixer is exported
Frequency signal is mixed with local oscillation signal in each mixting circuit respectively, exports intermediate-freuqncy signal, and low-pass filtered device is filtered；
The local oscillation signal of each mixting circuit uses the I/Q quadrature square wave signals of 25% dutycycle, is realized by two mixting circuits same
Mutually orthogonal I/Q frequency conversions.
In summary, currently without a special system and method energy for being used to detecting and positioning 20kHz square-wave signals
It is enough that accurately, quickly, intuitively 20kHz square-wave signals are detected.The single chip computer experiment equipment that Chinese Universities ' is used at this stage,
There is no complete 20khz detection devices., it is necessary to make signal detecting part by hand before 20khz signal detection experiments are carried out,
Because the circuit of detection part is complex, the effect for making detection part by hand is very bad, the locating effect influence on after
Seriously, and waste the plenty of time；Positioning after a test, show, it is necessary to which by scm test case, its cost is higher.
The content of the invention
Present invention aims at provide it is a kind of can overcome above-mentioned technical problem be used for detect and position 20kHz square waves letter
Number system and method, the present invention can intuitively, quickly and accurately detect the positions of 20kHz square-wave signals effectively to carry
The high efficiency for the work that tracks simultaneously can be widely used in multiple technologies field.
The system for being used to detect and position 20kHz square-wave signals of the present invention includes：The L-C that 6 identicals are sequentially connected
Oscillating circuit collector circuit, hardware filtering and amplifying circuit, rectification circuit, singlechip group into circuit.
6 L-C oscillating circuit collector circuits are arranged in symmetrical mode two-by-two, 6 L-C vibrations
The square-wave signal that circuit collector circuit is collected is transferred to after first passing around hardware filtering, amplification, the processing procedure of rectification
In single-chip microcomputer, the position for calculating square-wave signal source after processing again and angle are filtered by single-chip microcomputer and list is transmitted the result to
Shown in the LCD liquid crystal displays of piece machine.The square wave letter that 6 identicals L-C oscillating circuit collector circuits are collected
It is transferred to after number first passing around hardware filtering, amplification, the processing procedure of rectification in single-chip microcomputer.
6 identicals L-C oscillating circuit collectors circuit, hardware filtering and amplifying circuit, rectification circuit are constituted
6 output ends of circuit are respectively connecting to pin PTB2, pin PTB3, pin PTB4, pin PTB5, the pin of single-chip microcomputer
PTB6, pin PTB7.
The L-C oscillating circuits collector circuit includes：Electric capacity C1, inductance L1, GND earthed circuit.
In the L-C oscillating circuits collector circuit, C1 is electric capacity, and size is 6.8nF；L1 is inductance, and size is
10mH；GND is that earthed circuit is connected at 0V power grounds.
According to L-C circuit theories：
In above formula, f is induction frequencies, and π is pi, and L is inductance size, and C is capacitance size.
Because electronic component has about 5% error, therefore, the L-C oscillating circuits collector circuit collection square wave letter
Number frequency range be：1.8381*104Hz to 2.0316*104Hz, i.e. 18.381kHz to 20.316kHz.
The hardware filtering and amplifying circuit include：Tl082 dual operational amplifiers chip, electric capacity C2, electric capacity C3, electric capacity
C4, electric capacity C5, resistance R1, resistance R2, resistance R4, potentiometer R3.
In the hardware filtering and amplifying circuit, tl082 is dual operational amplifier chip；C2, C3, C4, C5 are electricity
Hold, resistance is 100nf；R1, R2, R4 are resistance, and resistance is respectively 2K, 10K, 10K ohm；R3 is potentiometer, maximum value
For 100K ohm；+ 5 access+5v power supplys；- 5 access -5v power supplys；GND accesses 0V power grounds；2 marks 1 are connected with each other, 2
Mark 6 is connected with each other.Wherein, C4, C5 are chip power supply filter capacitor, eliminate making an uproar for tl082 dual operational amplifiers chip generation
Sound；C2, C3 are signal filtering electric capacity；By dual operational amplifier chip and peripheral circuit, square-wave signal is filtered and put
Greatly, potentiometer R3 can adjust the multiplication factor to square-wave signal, so as to which square-wave signal input single-chip microcomputer is calculated, that is, count
Calculate position and the angle of square-wave signal source.
The rectification circuit includes：Electric capacity C6, electric capacity C7, resistance R5, diode D1, diode D2.
In the rectification circuit, C6, C7 are electric capacity, and resistance is 100nf；R5 is resistance, and resistance is 51K ohm；
GND accesses 0V power grounds；The diode D1 of the rectification circuit, the diode D2 connections hardware filtering and amplifying circuit
Output end；The output end of the rectification circuit connects the single-chip microcomputer.
The method for being used to detect and position 20kHz square-wave signals of the present invention comprises the following steps：
1st, the system for being used to detect and position 20kHz square-wave signals of the present invention is placed on around 20kHz square-wave signals, and
The system power supply for being used to detecting and positioning 20kHz square-wave signals to the present invention.
2nd, shaken by the L-C for being used to detect and position 6 diverse locations of the system of 20kHz square-wave signals of the present invention
Circuit collector circuit is swung by the 20kHz square-wave signal input hardware filter circuits and amplifying circuit, rectification circuit that collect
It is filtered, amplifies, rectification is handled.
3rd, in the incoming single-chip microcomputer of result for treating step 2, by single-chip microcomputer filtering optimization data, and 20kHz is calculated
The position of square-wave signal and the angle of signal are the direction of signal radiation.
4th, step 3 result of calculation is exported by single-chip microcomputer lcd screen.Can intuitively, fast and accurately detect 20kHz
The position of square-wave signal, improves the efficiency for the work that tracks.
The step 1 also includes：The power supply of the system for detecting and positioning 20kHz square-wave signals of the present invention is adopted
With general+5v/2A power supplies, it is of the invention be used to detecting and position in the system of 20kHz square-wave signals using+5v to-
5v voltage conversion circuit ,+5v to+3.3v voltage conversion circuit, ± 5v the power supplys ,+3.3v power supplys provided for internal system.
In the step 2,6 L-C of the system for detecting and positioning 20kHz square-wave signals of the invention vibrate electricity
Road collector circuit is using arrangement form symmetrical two-by-two.
Pass through the L-C oscillating circuit collector circuits for being used to detecting and positioning the system of 20kHz square-wave signals of the present invention
20kHz square-wave signals are gathered after hardware filtering and amplification, hardware rectification processing, the d. c. voltage signal for being 0-3.3v is defeated
Enter to the pin of single-chip microcomputer, the size of the 0v-3.3v d. c. voltage signals and the sensing of L-C oscillating circuit collector circuits
The distance between coil and 20kHz square-wave signal sources inversely, i.e., the induction coil of L-C oscillating circuits collector circuit away from
More remote between 20kHz square-wave signal sources, d. c. voltage signal is smaller, conversely, d. c. voltage signal is bigger.But maximum is no more than
Setting value 3.3v.；The 0v-3.3v d. c. voltage signals size and the induction coil of L-C oscillating circuit collector circuits are placed
Angle formed by direction and the 20kHz signal sources direction of propagation is inversely proportional, i.e. the induction coil of L-C oscillating circuits collector circuit
When placement direction and the vertical 20kHz signal sources direction of propagation, d. c. voltage signal is close to 0；When parallel, d. c. voltage signal connects
It is bordering on setting value 3.3v.
Described ± 5v power supplys are supplied to playing in the system for detecting and positioning 20kHz square-wave signals of the present invention
Filtering, the operational amplifier chip of enlarging function are used；Described+3.3v power supplys be supplied to the present invention be used for detect and position
Single-chip microcomputer described in the system of 20kHz square-wave signals is used.
In the step 3, the 20kHz square-wave signals that the single-chip microcomputer is collected to 6 L-C oscillating circuit collector circuits
Carry out the data group after hardware filtering and amplification, hardware rectification processing and carry out data filtering, step is：In every group passed back 10
In data, remove 2 maximum numerical value and remove after 2 minimum numerical value, the average value of access group.
The data and the height of sensor that are collected to the single-chip microcomputer, the mapping table of angle are input to single-chip microcomputer
In.
The 20kHz square-wave signals that the single-chip microcomputer is collected to 6 L-C oscillating circuit collector circuits carry out hardware filtering
It is analyzed with 6 groups of data values after amplification, hardware rectification processing, described 6 L-C oscillating circuits collections of single chip application
Device calculates the position of 20kHz square-wave signal sources to the geometrical relationship of 20kHz square-wave signal source distances；The single-chip microcomputer uses 6
Individual L-C oscillating circuits collector calculates the angle of 20kHz square-wave signal sources to the geometrical relationship of 20kHz square-wave signal source distances
Degree.
In the step 4, the result that single-chip microcomputer is obtained is shown in the LCD display of single-chip microcomputer.Display content includes：
The present invention's is used to detect and positions the system of 20kHz square-wave signals and the intuitively position relationship of 20kHz square-wave signal sources, sheet
Invention be used for detect and position the system of 20kHz square-wave signals and the intuitively angular relationship of 20kHz square-wave signal sources, L-C
Real-time numerical value of the oscillating circuit collector circuit after hardware filtering and amplification, hardware rectification processing.
It is an advantage of the invention that the position of 20kHz square-wave signals can intuitively, fast and accurately be detected, substantially increase
Track the efficiency of work, and can be widely used in multiple fields.The present invention can provide a complete, effective detection
System simultaneously can be effectively saved experimental period and cost is low.
Brief description of the drawings
Fig. 1 is of the present invention a kind of for the schematic flow sheet for the method for detecting and positioning 20kHz square-wave signals；
Fig. 2 is of the present invention a kind of for the overall structure signal for the system for detecting and positioning 20kHz square-wave signals
Figure.
Embodiment
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.It is that the present invention is used to detect as shown in Figure 1
And position the schematic flow sheet of the method for 20kHz square-wave signals.In Fig. 1,6 L-C oscillating circuit collector circuits are with right two-by-two
The mode of title is arranged, and the square-wave signal that 6 L-C oscillating circuit collector circuits are collected first passes around hardware filter
It is transferred to after ripple, amplification, the processing procedure of rectification in single-chip microcomputer, is filtered by single-chip microcomputer after processing and calculates square-wave signal again
The position in source and angle and transmitting the result to is shown in the LCD liquid crystal displays of single-chip microcomputer.6 identical L-C vibrations
The square-wave signal that circuit collector circuit is collected is transferred to after first passing around hardware filtering, amplification, the processing procedure of rectification
In single-chip microcomputer.
6 identicals L-C oscillating circuit collectors circuit, hardware filtering and amplifying circuit, rectification circuit are constituted
6 output ends of circuit are respectively connecting to pin PTB2, pin PTB3, pin PTB4, pin PTB5, the pin of single-chip microcomputer
PTB6, pin PTB7.
The system for being used to detect and position 20kHz square-wave signals of the present invention includes：The L-C that 6 identicals are sequentially connected
Oscillating circuit collector circuit, hardware filtering and amplifying circuit, rectification circuit, single-chip microcomputer.
As shown in Fig. 2 in the L-C oscillating circuits collector circuit, C1 is electric capacity, size is 6.8nF；L1 is electricity
Sense, size is 10mH；GND is earthed circuit, is connected at 0V power grounds.
According to L-C circuit theories：
In above formula, f is induction frequencies, and π is pi, and L is inductance size, and C is capacitance size.
Because electronic component has about 5% error, therefore, the L-C oscillating circuits collector circuit collection square wave letter
Number frequency range be：1.8381*104Hz to 2.0316*104Hz, i.e. 18.381kHz to 20.316kHz.
As shown in Fig. 2 in the hardware filtering and amplifying circuit, tl082 is dual operational amplifier chip； C2、C3、
C4, C5 are electric capacity, and resistance is 100nf；R1, R2, R4 are resistance, and resistance is respectively 2K, 10K, 10K ohm；R3 is current potential
Device, maximum value is 100K ohm；+ 5 access+5v power supplys；- 5 access -5v power supplys；GND accesses 0V power grounds；2 marks 1
It is connected with each other, 2 marks 6 are connected with each other.Wherein, C4, C5 are chip power supply filter capacitor, eliminate the production of dual operational amplifier chip
Raw noise；C2, C3 are signal filtering electric capacity；By dual operational amplifier chip and peripheral circuit, square-wave signal is filtered
Ripple and amplification, potentiometer R3 can adjust the multiplication factor to square-wave signal, so as to which square-wave signal input single-chip microcomputer is counted
Calculate, that is, calculate position and the angle of square-wave signal source.
As shown in Fig. 2 in the rectification circuit, C6, C7 are electric capacity, and resistance is 100nf；R5 is resistance, and resistance is
51K ohm；GND accesses 0V power grounds；Diode D1, D2 of the rectification circuit connect the hardware filtering and amplifying circuit
Output end；The output end of the rectification circuit connects the single-chip microcomputer.
As shown in Fig. 2 embodiments of the present invention are by taking K60 single-chip microcomputers as an example, K60 single chip circuits are single with reference to K60 series
Piece machine service manual, RST pins, D/C pins, CLK pin, the MOSI pins of OLED display screen are respectively connected to K60 single-chip microcomputers
PTA1, PTA2, PTA3, PTA4 pin；The square-wave signal that 6 identicals L-C oscillating circuit collector circuits are collected
Amplify by hardware, filter, the output after rectification is respectively connected to the pin PTB2 of K60 single-chip microcomputers, pin PTB3, pin PTB4,
Pin PTB5, pin PTB6, pin PTB7.I.e. described 6 identicals L-C oscillating circuit collectors circuit, hardware filtering and put
6 output ends of the circuit that big circuit, rectification circuit are constituted are respectively connecting to the pin PTB2, pin PTB3, pin of single-chip microcomputer
PTB4, pin PTB5, pin PTB6, pin PTB7.Fig. 2 only shows L-C oscillating circuit collectors circuit, a hardware filtering
One output end of the circuit constituted with amplifying circuit, rectification circuit is connected to the pin PTB2 of single-chip microcomputer.
The method for being used to detect and position 20kHz square-wave signals of the present invention comprises the following steps：
1st, the system for being used to detect and position 20kHz square-wave signals of the present invention is placed on around 20kHz square-wave signals, and
The system power supply for being used to detecting and positioning 20kHz square-wave signals to the present invention.
2nd, shaken by the L-C for being used to detect and position 6 diverse locations of the system of 20kHz square-wave signals of the present invention
Circuit collector circuit is swung by the 20kHz square-wave signal input hardware filter circuits and amplifying circuit, rectification circuit that collect
It is filtered, amplifies, rectification is handled.
3rd, in the incoming single-chip microcomputer of result for treating step 2, by single-chip microcomputer filtering optimization data, and 20kHz is calculated
The position of square-wave signal and the angle of signal are the direction of signal radiation.
4th, step 3 result of calculation is exported by single-chip microcomputer lcd screen.Can intuitively, fast and accurately detect 20kHz
The position of square-wave signal, improves the efficiency for the work that tracks.
The step 1 also includes：The power supply of the system for detecting and positioning 20kHz square-wave signals of the present invention is adopted
With general+5v/2A power supplies, it is of the invention be used to detecting and position in the system of 20kHz square-wave signals using+5v to-
5v voltage conversion circuit ,+5v to+3.3v voltage conversion circuit, ± 5v the power supplys ,+3.3v power supplys provided for internal system.
In the step 2,6 L-C of the system for detecting and positioning 20kHz square-wave signals of the invention vibrate electricity
Road collector circuit is using arrangement form symmetrical two-by-two.
Pass through the L-C oscillating circuit collector circuits for being used to detecting and positioning the system of 20kHz square-wave signals of the present invention
20kHz square-wave signals are gathered after hardware filtering and amplification, hardware rectification processing, the d. c. voltage signal for being 0-3.3v is defeated
Enter to the pin of single-chip microcomputer, the size of the 0v-3.3v d. c. voltage signals and the sensing of L-C oscillating circuit collector circuits
The distance between coil and 20kHz square-wave signal sources inversely, i.e., the induction coil of L-C oscillating circuits collector circuit away from
More remote between 20kHz square-wave signal sources, d. c. voltage signal is smaller, conversely, d. c. voltage signal is bigger.But maximum is no more than
Setting value 3.3v.；The 0v-3.3v d. c. voltage signals size and the induction coil of L-C oscillating circuit collector circuits are placed
Angle formed by direction and the 20kHz signal sources direction of propagation is inversely proportional, i.e. the induction coil of L-C oscillating circuits collector circuit
When placement direction and the vertical 20kHz signal sources direction of propagation, d. c. voltage signal is close to 0；When parallel, d. c. voltage signal connects
It is bordering on setting value 3.3v.
Described ± 5v power supplys are supplied to playing in the system for detecting and positioning 20kHz square-wave signals of the present invention
Filtering, the operational amplifier chip of enlarging function are used；Described+3.3v power supplys be supplied to the present invention be used for detect and position
Single-chip microcomputer described in the system of 20kHz square-wave signals is used.
In the step 3, the 20kHz square-wave signals that the single-chip microcomputer is collected to 6 L-C oscillating circuit collector circuits
Carry out the data group after hardware filtering and amplification, hardware rectification processing and carry out data filtering, step is：In every group passed back 10
In data, remove 2 maximum numerical value and remove after 2 minimum numerical value, the average value of access group.
The data and the height of sensor that are collected to the single-chip microcomputer, the mapping table of angle are input to single-chip microcomputer
In.
The 20kHz square-wave signals that the single-chip microcomputer is collected to 6 L-C oscillating circuit collector circuits carry out hardware filtering
It is analyzed with 6 groups of data values after amplification, hardware rectification processing, described 6 L-C oscillating circuits collections of single chip application
Device calculates the position of 20kHz square-wave signal sources to the geometrical relationship of 20kHz square-wave signal source distances；The single-chip microcomputer uses 6
Individual L-C oscillating circuits collector calculates the angle of 20kHz square-wave signal sources to the geometrical relationship of 20kHz square-wave signal source distances
Degree.
In the step 4, the result that single-chip microcomputer is obtained is shown in the LCD display of single-chip microcomputer.Display content includes：
The present invention's is used to detect and positions the system of 20kHz square-wave signals and the intuitively position relationship of 20kHz square-wave signal sources, sheet
Invention be used for detect and position the system of 20kHz square-wave signals and the intuitively angular relationship of 20kHz square-wave signal sources, L-C
Real-time numerical value of the oscillating circuit collector circuit after hardware filtering and amplification, hardware rectification processing.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art is in scope disclosed by the invention, and the change or replacement that can be readily occurred in should all be contained
Lid is within the scope of the invention as claimed.
Claims (9)
1. a kind of system for detecting and positioning 20kHz square-wave signals, it is characterised in that including：6 identicals are sequentially connected
L-C oscillating circuit collectors circuit, hardware filtering and amplifying circuit, rectification circuit, singlechip group into circuit；
6 L-C oscillating circuit collector circuits are arranged in symmetrical mode two-by-two, 6 identical L-C vibrations
The square-wave signal that circuit collector circuit is collected is transferred to after first passing around hardware filtering, amplification, the processing procedure of rectification
In single-chip microcomputer, 6 identicals L-C oscillating circuit collectors circuit, hardware filtering and amplifying circuit, rectification circuit are constituted
6 output ends of circuit are respectively connecting to pin PTB2, pin PTB3, pin PTB4, pin PTB5, the pin of single-chip microcomputer
PTB6, pin PTB7.
2. a kind of system for detecting and positioning 20kHz square-wave signals according to claim 1, it is characterised in that institute
Stating L-C oscillating circuit collector circuits includes：Electric capacity C1, inductance L1, GND earthed circuit；In the L-C oscillating circuits collector
In circuit, electric capacity C1 sizes are 6.8nF；Inductance L1 sizes are 10mH；GND earthed circuits are connected at 0V power grounds.
3. a kind of system for detecting and positioning 20kHz square-wave signals according to claim 1, it is characterised in that institute
Stating hardware filtering and amplifying circuit includes：Tl082 dual operational amplifiers chip, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electricity
Hinder R1, resistance R2, resistance R4, potentiometer R3.
4. a kind of system for detecting and positioning 20kHz square-wave signals according to claim 1, it is characterised in that institute
Stating rectification circuit includes：Electric capacity C6, electric capacity C7, resistance R5, diode D1, diode D2；GND accesses 0V power grounds；It is described
Diode D1, the diode D2 connections hardware filtering and amplifying circuit output end；The output end connection of the rectification circuit
The single-chip microcomputer.
5. the detection and positioning of a kind of system for being used to detect and position 20kHz square-wave signals based on described in claim 1
The method of 20kHz square-wave signals, it is characterised in that comprise the following steps：
(1), the system for being used to detect and position 20kHz square-wave signals is placed on around 20kHz square-wave signals, and to described
System power supply for detecting and positioning 20kHz square-wave signals；
(2), adopted by the L-C oscillating circuits of 6 diverse locations of the system for being used to detect and position 20kHz square-wave signals
Storage circuit will be filtered in the 20kHz square-wave signal input hardware filter circuits and amplifying circuit, rectification circuit that collect,
Amplification, rectification processing；
(3), in the incoming single-chip microcomputer of result for treating step (2), by single-chip microcomputer filtering optimization data, and 20kHz is calculated
The position of square-wave signal and the angle of signal are the direction of signal radiation；
(4), step (3) result of calculation is exported by single-chip microcomputer lcd screen；Can intuitively, fast and accurately detect 20kHz
The position of square-wave signal；
Described ± 5v power supplys are supplied to playing filtering, putting in the system for detecting and positioning 20kHz square-wave signals
The operational amplifier chip of big function is used；Described+3.3v power supplys are supplied to described for detecting and positioning 20kHz square waves letter
Number system described in single-chip microcomputer use.
6. the method according to claim 5 for detecting and positioning 20kHz square-wave signals, it is characterised in that the step (1)
Also include：It is described to be powered electricity using general+5v/2A for the power supply of system that detects and position 20kHz square-wave signals
Source, the voltage conversion circuit for being used to detect and position in the systems of 20kHz square-wave signals using+5v to -5v ,+5v to+
3.3v voltage conversion circuit, ± 5v the power supplys ,+3.3v power supplys provided for internal system.
7. the method according to claim 5 for detecting and positioning 20kHz square-wave signals, it is characterised in that the step (2)
In, 6 L-C oscillating circuit collectors circuits of the system for detecting and positioning 20kHz square-wave signals use right two-by-two
Claim the arrangement form of distribution.
8. the method according to claim 5 for detecting and positioning 20kHz square-wave signals, it is characterised in that the step (3)
In, the 20kHz square-wave signals that the single-chip microcomputer is collected to 6 L-C oscillating circuit collector circuits carry out hardware filtering and put
Greatly, the data group after hardware rectification processing carries out data filtering, and step is：In 10 data of every group passed back, remove 2 most
Big numerical value and remove after 2 minimum numerical value, the average value of access group；
The data and the height of sensor that are collected to the single-chip microcomputer, the mapping table of angle are input in single-chip microcomputer；Institute
State the 20kHz square-wave signals that single-chip microcomputer collects to 6 L-C oscillating circuit collector circuits carry out hardware filtering and amplification, it is hard
6 groups of data values after part rectification processing are analyzed, described 6 L-C oscillating circuits collectors of single chip application to 20kHz
The geometrical relationship of square-wave signal source distance calculates the position of 20kHz square-wave signal sources；The single-chip microcomputer uses 6 L-C vibrations
Circuit collector calculates the angle of 20kHz square-wave signal sources to the geometrical relationship of 20kHz square-wave signal source distances.
9. the method according to claim 5 for detecting and positioning 20kHz square-wave signals, it is characterised in that the step (4)
In, the result that single-chip microcomputer is obtained is shown in the LCD display of single-chip microcomputer；Display content includes：It is described to be used to detect and fixed
It is the intuitively position relationship of system and the 20kHz square-wave signal sources of position 20kHz square-wave signals, described for detecting and positioning
The system of 20kHz square-wave signals is passed through with the intuitively angular relationship of 20kHz square-wave signal sources, L-C oscillating circuit collectors circuit
The real-time numerical value crossed after hardware filtering and the rectification processing of amplification hardware.
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