CN114157271A - Novel ultra-wideband sensor time domain signal device - Google Patents

Abstract

The invention relates to a novel ultra-wideband sensor time domain signal device, and relates to the technical field of ultra-wideband sensor signals. The invention comprises a time domain pulse signal generator, which comprises at least one periodic square wave generator and at least one time domain pulse shaping network, wherein the periodic square wave generator comprises at least one monostable circuit driven by a trigger signal, at least one coupler capacitor and at least one emitter follower, the time domain pulse signal generator is a pulse shaping network based on a diode, the pulse shaping network comprises a combination circuit based on the diode, a turning point control circuit and an output diode network, and the time domain pulse shaper is used for generating a time domain pulse signal according to the excitation of the periodic square wave generator.

Description

Novel ultra-wideband sensor time domain signal device

Technical Field

The invention relates to the technical field of ultra-wideband sensor signals, in particular to a novel ultra-wideband sensor time domain signal device.

Background

With the continuous deepening of the application of the ultra-wideband technology, the technology of transmitting, receiving, acquiring and processing the ultra-wideband sensing signal becomes one of the hot spots of domestic and foreign research in the technical field, the ultra-wideband sensor technology has the high resolution performance of the characteristics of the ultra-wideband technology, can obtain the fine echo response of a complex target, is very beneficial to the identification and imaging of the target, has the advantages of high data transmission rate, low power consumption, low cost and the like, and has wide application in the fields of high data communication systems, ground detection, through-wall imaging, biomedical imaging and the like.

Aiming at the design problem of a signal transceiver of the ultra-wideband sensing technology, higher requirements are put forward on the design of a signal generation and processing circuit structure and the simplicity and convenience of signal adjustment in recent years, so that the real-time and accurate acquisition capability of the technology is realized. In each key technology of the ultra-wideband sensor, a signal generation technology is always a technology problem which is concerned about in the field of ultra-wideband circuit research, taking a time domain pulse sequence as an example, a time domain pulse with a high pulse width can provide a good penetration depth, and a narrow time domain pulse can improve the distance resolution. In addition, high power time domain pulses may improve the detection range of the sensor as well as the pulse penetration depth. The technology is now widely used in Ultra Wide Band (UWB) sensor transceivers for various applications such as subsurface sensing, non-destructive inspection, geophysical prospecting, oil well inspection, steam mapping in oil sands, and medical applications.

Different types of applications, however, require different temporal pulse characteristics, including full width at half maximum (FWHM) pulse width, ringing level, and output power and amplitude. There are many ways to generate a series of time domain pulses from a periodic rectangular or sinusoidal signal, a. a transmitted time domain pulse with a low ring level will provide better signal-to-noise ratio, and simpler calibration and signal processing algorithms; b. the use of Bipolar Junction Transistors (BJTs) in the avalanche breakdown region can generate high voltage pulses with high dissipated power at low Pulse Repetition Frequencies (PRFs); c. the pulse generator designed based on the Tunnel Diode (TD) can generate rapid rise time, and the pulse amplitude is as low as about tens of picoseconds; d. e. using reverse biased varactors or schottky diodes in parallel with the transmission line, this structure creates a nonlinear transmission line (NLTL) and serves to shorten the rise time of a given input pulse. Currently, the most common method of generating the time domain pulse is to switch it from forward biased to reverse biased. The diode-based technique proposed by the present invention is a more straightforward, efficient method of designing and developing a pulse generator than the various methods above. The existing pulse generating circuit has a complex structure, is not beneficial to adjusting the signal amplitude and the pulse width, has high cost, and is not suitable for application of a commercial miniaturized ultra-wideband sensor.

Disclosure of Invention

Therefore, the invention provides a novel ultra-wideband sensor time domain signal device which is used for solving the problems that a pulse generator in the prior art is complex in structure and not easy to adjust.

In order to achieve the above object, the present invention provides a novel ultra-wideband sensor time domain signal device, comprising:

a time domain pulse signal generator comprising at least one periodic square wave generator and at least one time domain pulse shaping network for generating an adjustable time domain pulse signal upon receipt of a trigger signal;

the periodic square wave generator comprises at least one monostable circuit driven by the trigger signal, at least one coupler capacitor and at least one emitter follower, and is used for generating a periodic square wave signal when receiving the trigger signal;

the time domain pulse signal generator is a diode-based pulse shaping network, the pulse shaping network comprises a diode-based combination circuit, a turning point control circuit and an output diode network, and the time domain pulse shaper is used for generating a time domain pulse signal according to the excitation of the periodic square wave generator.

The control module is respectively connected with a monostable circuit in the periodic square wave generator, a diode circuit in the time domain pulse signal generator and a turning point control circuit, and is used for setting the time domain pulse signal generated by the time domain pulse signal generator according to the use requirement and adjusting the duty ratio of the monostable circuit, the electrifying time of the diode-based combined circuit and/or the resistance value of the turning point control circuit in the use process.

Further, the control module is configured to set a pulse width of the time-domain pulse signal to be a first pulse width H1 and set a pulse amplitude to be F1 when the time-domain pulse generator is in use, and acquire a pulse width H and a pulse amplitude F of a return signal when the signal is transmitted for a preset time period t, when the acquisition of the return signal is completed, calculate a pulse width difference Δ H and a pulse amplitude difference Δ F, set Δ H to H1-H and Δ F to F1-F, compare the pulse width difference Δ H with a preset pulse width difference Δ H0, compare the pulse amplitude difference Δ F with a preset pulse amplitude difference Δ F0, and determine whether the time-domain pulse signal generated by the time-domain pulse generator is qualified according to the comparison result,

if delta H < [ delta ] H0 and/or delta ] F < [ delta ] F0, the control module judges that the time domain pulse signal generated by the time domain pulse generator is unqualified;

and if the delta H is not less than the delta H0 or the delta F is not less than the delta F0, the control module judges that the time domain pulse signal generated by the time domain pulse generator is qualified.

Further, the control module is further configured to calculate a ratio Bh between the pulse width difference Δ H and a preset pulse width difference Δ H0 when the time domain pulse signal is unqualified and Δ H is less than Δ H0, and select a corresponding power-on duration adjustment coefficient according to a comparison result between the ratio Bh and the preset width difference ratio to adjust the power-on duration of the diode-based combinational circuit, the control module sets the adjusted power-on duration as T1, and sets T1 as T × Khi, where T1 is an initial power-on duration of the diode-based combinational circuit, and Khi is a power-on market adjustment coefficient;

the control module is further configured to calculate a ratio Bf between the pulse amplitude difference Δ F and a preset pulse amplitude difference Δ F0 when the time domain pulse signal is unqualified and Δ F is less than Δ F0, select a corresponding adjustment coefficient according to a comparison result between the ratio and the preset amplitude difference ratio to adjust a resistance value of the turning point control circuit, and set the adjusted resistance value as R1 and R1 as R × Kfj, where R is an initial resistance value of the turning point control circuit and Kfj is a resistance value adjustment coefficient.

Further, the control module is further provided with a maximum power-on duration Tmax, and is further configured to compare the adjusted power-on duration T1 with the maximum power-on duration when the adjustment of the power-on market is completed, if T1 is greater than Tmax, the control module calculates a duration difference Δ T between the power-on duration T1 and the maximum power-on duration Tmax, sets the Δ T to be T1-Tmax, and selects a corresponding duty ratio adjustment coefficient according to a comparison result of the duration difference and a preset duration difference to adjust the duty ratio of the monostable circuit, the control module sets the adjusted duty ratio to be D1, sets D1 to be D × Ktn, where D is an initial duty ratio of the monostable circuit, and Ktn is a duty ratio adjustment coefficient.

Furthermore, the monostable circuit comprises at least one capacitor, at least two transistors and at least four resistors, the power is supplied by a negative level, a second resistor, a third resistor and a fifth resistor are connected in parallel and are respectively connected with the negative level power supply circuit, the second resistor is connected with the second transistor in series and is connected with the trigger signal circuit, the third resistor is connected with the third transistor in series and is connected with the starting signal circuit through a fourth resistor, a second capacitor is arranged between the second resistor and the third resistor, the second transistor and the third transistor are respectively grounded, and the monostable circuit is used for converting the trigger signal into a sharp square pulse with adjustable duty ratio.

Further, the emitter follower comprises at least one transistor and at least two resistors, the emitter follower is connected with the monostable circuit, and a coupling capacitor is connected in parallel between the emitter follower and the monostable circuit, wherein a fourth transistor is connected with the sixth resistor in parallel, the fourth transistor is connected with the seventh resistor and is grounded, the emitter follower adjusts output current to increase output power, and the emitter follower is used for outputting square wave signals.

Further, the diode-based combination circuit is a combination of parallel and series diodes, and comprises at least one capacitor, at least one resistor, at least two diodes and at least three inductors, and is powered by a negative level, wherein a fourth capacitor is connected in series with a first inductor, a third inductor and a fifth transistor, the fifth transistor is connected in parallel between the first inductor and the third inductor and grounded, the third inductor is connected in parallel with a sixth transistor, and a second inductor and an eighth resistor are arranged on the power supply circuit and connected between the third inductor and the sixth transistor.

Further, the parallel diodes generate sharp rising edges and the series diodes generate falling edges.

Further, the turning point control circuit is connected with the combination circuit and comprises at least one ninth resistor which is connected with the sixth transistor and is grounded, the resistor is connected with the circuit in parallel, the output diode network is connected with the turning point control circuit and comprises at least one capacitor and at least one transistor, and the diode adjusts the transition time according to the ratio of the forward current to the reverse current.

Compared with the prior art, the invention has the beneficial effects that the square wave is converted into the time domain pulse by arranging the time domain pulse signal generator comprising the periodic square wave generator and the pulse shaping network. And the time domain shaping network is respectively provided with a bias network, a turning point control network and an output diode network. The novel pulse signal generator can generate time domain pulse signals with adjustable amplitude and pulse width, has small ringing amplitude, and can meet the application requirements of transmitters of different Ultra Wide Band (UWB) sensor systems.

Particularly, when the time domain pulse signal generator is used, whether the generated time domain pulse signal is qualified or not is judged according to the comparison result of the return signal and the transmitting signal through the control module, and when the judgment result is unqualified, the pulse width and the pulse amplitude of the time domain pulse signal of the time domain pulse generator are adjusted, so that the control precision of the signal device is improved, and the usability of the signal device is improved.

Further, the present invention overcomes the drawback of the prior art pulse generator that it is complicated and not easily adjustable by using a diode-based parallel and series combination method, using an output network comprising a variable resistor, an inductor and a schottky diode to generate variable pulse width and amplitude with a minimal ringing level. The pulse generator has simple structure and low cost, is suitable for application of miniaturized ultra-wideband sensors, and can meet the application requirements of different ultra-wideband sensor transmitters.

Further, the diode-based pulse shaping network of the present invention utilizes both parallel and series combinations of diodes that are driven using a transistor-based square wave generator. The turning point control circuit is used for controlling the diode and the forward and reverse current ratio of the diode and adjusting the pulse width and amplitude of the time domain output pulse. The use of an output diode network can reduce the ringing level of the pulses. The interconnections between the diodes are designed and optimized to improve amplitude and pulse width. Thus, time domain pulses of variable pulse width and amplitude from 60 picoseconds to 300 picoseconds or more, pulse amplitudes from 1 volt to 15 volts, and ringing levels less than 11% can be achieved.

Drawings

FIG. 1 is a block diagram of the overall structure of a time domain pulse generator of the novel ultra-wideband sensor time domain signal device according to the present invention;

FIG. 2 is a structural block diagram of a periodic normal wave generator of the novel ultra-wideband sensor time domain signal device according to the present invention;

FIG. 3 is a block diagram of a time domain pulse shaping network of the novel ultra-wideband sensor time domain signal device according to the present invention;

FIG. 4 is a circuit diagram of a periodic square wave generator according to the present invention;

fig. 5 is a circuit diagram of a time domain pulse shaping network according to the present invention.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1-3, fig. 1 is a block diagram of an overall structure of a time domain pulse generator of a time domain signal device of an ultra-wideband sensor according to the present invention; FIG. 2 is a structural block diagram of a periodic normal wave generator of the novel ultra-wideband sensor time domain signal device according to the present invention; fig. 3 is a block diagram of a time domain pulse shaping network of the novel ultra-wideband sensor time domain signal device according to the present invention.

The invention discloses a novel ultra-wideband sensor time domain signal device, which comprises:

a time domain pulse signal generator comprising at least one periodic square wave generator and at least one time domain pulse shaping network for generating an adjustable time domain pulse signal upon receipt of a trigger signal;

the periodic square wave generator comprises at least one monostable circuit driven by the trigger signal, at least one coupler capacitor and at least one emitter follower, and is used for generating a periodic square wave signal when receiving the trigger signal;

the time domain pulse signal generator is a diode-based pulse shaping network, the pulse shaping network comprises a diode-based combination circuit, a turning point control circuit and an output diode network, and the time domain pulse shaper is used for generating a time domain pulse signal according to the excitation of the periodic square wave generator.

Specifically, the monostable pulse generator is used for converting the trigger pulse into a sharp square pulse with adjustable duty ratio. The emitter follower circuit increases the output power by improving the output current. The pulse is used to excite a diode-based pulse shaping network.

Specifically, the time domain pulse shaping network is powered by a negative level, with the parallel diodes producing a sharp rising edge and the series diodes forming a falling edge. The transition time Ts of the diodes depends on their ratio of forward current to reverse current. By optimizing the interconnection between the two diodes, the rising edge is enhanced and the pulse width and amplitude of the output pulse are improved. The ringing level of the output pulse can be reduced using an appropriate diode network based on the variable resistor and the turning point control of the dc voltage for varying the pulse width and the magnitude of the output pulse.

Fig. 4 is a circuit diagram of a periodic square wave generator according to the present invention.

The novel ultra-wideband sensor time domain signal device comprises a monostable circuit, a trigger signal circuit and a trigger signal circuit, wherein the monostable circuit comprises at least one capacitor, at least two transistors and at least four resistors and is powered by a negative level, a second resistor R2, a third resistor R3 and a fifth resistor R5 are connected in parallel and are respectively connected with the negative level power supply circuit, the second resistor R2 is connected with a second transistor T1 in series and is connected with the trigger signal circuit, the third resistor R3 is connected with a third transistor T2 in series and is connected with the trigger signal circuit through a fourth resistor R4, a second capacitor C2 is arranged between the second resistor R2 and the third resistor R3, the second transistor T1 and the third transistor T2 are respectively grounded, and the monostable circuit is used for converting the trigger signal into a sharp square pulse with an adjustable duty ratio.

The novel ultra-wideband sensor time domain signal device comprises an emitter follower and a plurality of resistors, wherein the emitter follower is connected with a monostable circuit and is connected with a coupling capacitor in parallel between the emitter follower and the monostable circuit, a fourth transistor T3 is connected with a sixth resistor R6 in parallel, a fourth transistor T3 is connected with a seventh resistor R7 and is grounded, the emitter follower adjusts output current to increase output power, and the emitter follower is used for outputting square wave signals.

Specifically, the square wave generator includes a monostable circuit driven by a trigger signal, a coupling capacitor C3, and an emitter follower as a buffer. The monostable pulse generator is used for converting the trigger pulse into a sharp square pulse with adjustable duty ratio. The emitter follower circuit increases the output power by improving the output current. The circuit can generate a square wave signal with a rise time of about 1 nanosecond and a duty cycle of about 20% to 40%.

Fig. 5 is a circuit diagram of a time domain pulse shaping network according to the present invention.

The novel ultra-wideband sensor time domain signal device comprises a diode combination which is connected in parallel and in series, and comprises at least one capacitor, at least one resistor, at least two diodes and at least three inductors, wherein the diode combination is powered by a negative level, a fourth capacitor C4 is connected in series with a first inductor L1, a third inductor L3 and a sixth transistor D3, a fifth transistor D2 is connected between the first inductor L1 and the third inductor L3 in parallel and grounded, the third inductor L3 is connected in series with the sixth transistor D3, and a second inductor L2 and an eighth resistor R8 are arranged on the power supply circuit and connected between the third inductor L3 and the sixth transistor D3.

According to the novel ultra-wideband sensor time domain signal device, the diodes are connected in parallel to generate a sharp rising edge, and the diodes are connected in series to generate a falling edge.

According to the novel ultra-wideband sensor time domain signal device, the turning point control circuit is connected with the fourth transistor of the combined circuit and comprises at least one resistor, and the resistor is connected with the circuit in parallel.

According to the novel ultra-wideband sensor time domain signal device, the turning point control circuit is connected with the combined circuit and comprises at least one ninth resistor which is connected with the sixth transistor and is grounded, the resistor is connected with the circuit in parallel, the output diode network is connected with the turning point control circuit and comprises at least one capacitor and at least one transistor, and the transition time of the diode is adjusted according to the ratio of forward current to reverse current.

Specifically, the diode-based pulse shaping network uses square wave pulse excitation, with capacitor C4 acting as a dc block, separating the dc bias of the diode from the bias point of the square wave generator. L1 will be a short circuit for low frequencies, i.e., the PRF of the input pulse, and prevent the high frequency harmonics generated by D2 from leaking into the square wave pulse generator causing an open circuit. L1 and L3 improve pulse width and enhance the high frequency content of the output pulse. In practice, L1 and C4 form a band pass filter LC filter that sharpens the rising edge of the square wave pulse by reducing the output inductance of the square wave pulse generator. Thus, the fast transition time of the diode is also increased. L2 is used to isolate the dc bias from the ac pulse. R8 controls the forward bias of D2.

To fully control the "turning point," R9 was placed after D3. When D3 is forward biased and steady state, Vcc (negative voltage), R8, and R9 specify IF 2. However, during the transition time, when D3 is in reverse bias, the load resistance determines the reverse bias (IR2), (IF2/IR2) ratio specifying the turning point.

In addition, an output diode network, including C5 and D4, is established between the series diode D3 and the load resistor to eliminate the ramp portion of the output pulse and reduce the ringing level of the output pulse. The configuration of the output diode network has a significant effect on the characteristics of the output pulse.

The novel ultra-wideband sensor time domain signal device provided by the embodiment of the invention further comprises a control module used for controlling the signal output by the time domain pulse signal generator according to the generated time domain pulse signal, the control module is respectively connected with a monostable circuit in the periodic square wave generator, a diode circuit in the time domain pulse signal generator and a turning point control circuit, the control module is used for setting the time domain pulse signal generated by the time domain pulse signal generator according to the use requirement, and the duty ratio of the monostable circuit, the electrifying time of the diode-based combined circuit and/or the resistance value of the turning point control circuit are/is adjusted in the use process.

Specifically, the control module is configured to set a pulse width of the time-domain pulse signal to be a first pulse width H1 and set a pulse amplitude to be F1 when the time-domain pulse generator is in use, and acquire a pulse width H and a pulse amplitude F of a return signal when the signal is transmitted for a preset time period t, when the acquisition of the return signal is completed, calculate a pulse width difference Δ H and a pulse amplitude difference Δ F, set Δ H to H1-H and Δ F to F1-F, compare the pulse width difference Δ H with a preset pulse width difference Δ H0, compare the pulse amplitude difference Δ F with a preset pulse amplitude difference Δ F0, and determine whether the time-domain pulse signal generated by the time-domain pulse generator is qualified according to a comparison result,

if delta H < [ delta ] H0 and/or delta ] F < [ delta ] F0, the control module judges that the time domain pulse signal generated by the time domain pulse generator is unqualified;

and if the delta H is not less than the delta H0 or the delta F is not less than the delta F0, the control module judges that the time domain pulse signal generated by the time domain pulse generator is qualified.

Specifically, the control module is further configured to calculate a ratio Bh between the pulse width difference Δ H and a preset pulse width difference Δ H0 when the time domain pulse signal is unqualified and Δ H is less than Δ H0, set Bh as Δ H/Δ H0, and select a corresponding power-on duration adjustment coefficient to adjust the power-on duration of the diode-based combinational circuit according to a comparison result of the ratio Bh and the preset width difference ratio,

wherein the control module is further provided with a first preset width difference ratio Bh1, a second preset width difference ratio Bh2, a third preset width difference ratio Bh3, a first energization time length adjusting coefficient Kh1, a second energization time length adjusting coefficient Kh2 and a third energization time length adjusting coefficient Kh3, wherein Bh1 is more than Bh2 and more than Bh3, Kh1 is more than 1 and more than Kh2 and more than Kh3 and less than 2,

when the delta H is less than or equal to the delta H1, the control module selects a first power-on time length adjusting coefficient Kh1 to adjust the power-on time length of the diode-based combined circuit;

when the time length of the combined circuit is more than delta H1 and less than or equal to delta H2, the control module selects a second power-on time length adjusting coefficient Kh2 to adjust the power-on time length of the combined circuit based on the diode;

when the time length of the combined circuit based on the diode is more than delta H2 and less than or equal to delta H3, the control module selects a third power-on time length adjusting coefficient Kh3 to adjust the power-on time length of the combined circuit based on the diode;

when the control module selects the ith power-on time length adjusting coefficient Khi to adjust the power-on time length of the diode-based combinational circuit, setting i to be 1, 2 and 3, setting the adjusted power-on time length to be T1 and setting T1 to be T multiplied by Khi.

Specifically, the control module is further configured to calculate a ratio Bf between the pulse amplitude difference Δ F and a preset pulse amplitude difference Δ F0 when the time domain pulse signal is unqualified and Δ F is less than Δ F0, set Bf/Δ F0, select a corresponding adjustment coefficient according to a comparison result between the ratio and the preset amplitude difference ratio to adjust the resistance value of the turning point control circuit,

wherein the control module is further provided with a first preset amplitude difference ratio Bf1, a second preset amplitude difference ratio Bf2, a third preset amplitude difference ratio Bf3, a first resistance value regulating coefficient Kf1, a second resistance value regulating coefficient Kf2 and a third resistance value regulating coefficient Kf3, wherein Bf1 is more than Bf2 and more than Bf3, 1 is more than Kf1 and more than Kf2 and more than Kf3 and less than 2,

when the delta F is less than or equal to the delta F1, the control module selects a first resistance value adjusting coefficient Kf1 to adjust the resistance value of the turning point control circuit;

when the delta F is more than delta F1 and less than or equal to delta F2, the control module selects a second resistance value adjusting coefficient Kf2 to adjust the resistance value of the turning point control circuit;

when the delta F is more than delta F2 and less than or equal to delta H3, the control module selects a third resistance value adjusting coefficient Kf3 to adjust the resistance value of the turning point control circuit;

when the control module selects the j-th resistance value adjusting coefficient Kfj to adjust the resistance value of the turning point control circuit, j is set to be 1, 2 and 3, the control module sets the adjusted resistance value to be R1, and R1 is set to be R × Kfj.

Specifically, the control module is further provided with a maximum power-on duration Tmax, the control module is further configured to compare the adjusted power-on duration T1 with the maximum power-on duration when the adjustment of the power-on market is completed, if T1 is greater than Tmax, the control module calculates a duration difference Δ T between the power-on duration T1 and the maximum power-on duration Tmax, sets the Δ T to be T1-Tmax, and selects a corresponding duty ratio adjustment coefficient according to a comparison result of the duration difference and a preset duration difference to adjust the duty ratio of the monostable circuit,

wherein the control module is further provided with a first preset time length difference delta T1, a second preset time length difference delta T2, a third preset time length difference delta T3, a first duty ratio adjusting coefficient Kt1, a second duty ratio adjusting coefficient Kt2 and a third duty ratio adjusting coefficient Kt3, wherein delta T1 is less than delta T2 is less than delta T3, 1 < Kt1 < Kt2 < Kt3 < 1.5,

when the delta T is less than or equal to the delta T1, the control module selects a first duty ratio adjusting coefficient Kt1 to adjust the duty ratio of the monostable circuit;

when the delta T1 is less than the delta T and less than or equal to the delta T2, the control module selects a second duty ratio adjusting coefficient Kt2 to adjust the duty ratio of the monostable circuit;

when the delta T2 is less than or equal to the delta T3, the control module selects a third duty ratio adjusting coefficient Kt3 to adjust the duty ratio of the monostable circuit;

when the control module selects the nth duty ratio adjustment coefficient Ktn to adjust the duty ratio of the monostable circuit, setting n to 1, 2 and 3, and the control module sets the adjusted duty ratio to D1 and sets D1 to D × Ktn.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A novel ultra-wideband sensor time domain signal device, comprising:

a time domain pulse signal generator comprising at least one periodic square wave generator and at least one time domain pulse shaping network for generating an adjustable time domain pulse signal upon receipt of a trigger signal;

the periodic square wave generator comprises at least one monostable circuit driven by the trigger signal, at least one coupling capacitor and at least one emitter follower, and is used for generating a periodic square wave signal when receiving the trigger signal;

the time domain pulse shaping network is a diode-based pulse shaping network, the pulse shaping network comprises a diode-based combination circuit, a turning point control circuit and an output diode circuit, and the time domain pulse shaping network is used for generating a time domain pulse signal according to the excitation of the periodic square wave generator.

2. The ultra-wideband sensor time-domain signal device of claim 1, further comprising a control module for controlling the signal outputted by the time-domain pulse signal generator according to the generated time-domain pulse signal, wherein the control module is respectively connected to the monostable circuit in the periodic square wave generator and the diode circuit and the turning point control circuit in the time-domain pulse signal generator, and is configured to set the time-domain pulse signal generated by the time-domain pulse signal generator according to the usage requirement, and adjust the duty cycle of the monostable circuit, the power-on duration of the diode-based combination circuit, and/or the resistance value of the turning point control circuit during the usage.

3. The novel ultra-wideband sensor time-domain signal device of claim 2, the control module is arranged, in use, to set a pulse width of the time domain pulse signal to a first pulse width H1, a pulse amplitude to F1, and obtaining the pulse width H and the pulse amplitude F of the return signal when the signal is transmitted for a preset time t, the control module calculates the pulse width difference DeltaH and the pulse amplitude difference DeltaF when the return signal acquisition is completed, sets the DeltaH as H1-H and the DeltaF as F1-F, comparing the pulse width difference DeltaH with a preset pulse width difference DeltaH 0, comparing the pulse amplitude difference DeltaF with a preset pulse amplitude difference DeltaF 0, and judging whether the time domain pulse signal generated by the time domain pulse generator is qualified or not according to the comparison result,

if delta H < [ delta ] H0 and/or delta ] F < [ delta ] F0, the control module judges that the time domain pulse signal generated by the time domain pulse generator is unqualified;

and if the delta H is not less than the delta H0 or the delta F is not less than the delta F0, the control module judges that the time domain pulse signal generated by the time domain pulse generator is qualified.

4. The apparatus of claim 3, wherein the control module is further configured to calculate a ratio Bh of the pulse width difference Δ H to a preset pulse width difference Δ H0, set Bh as Δ H/. DELTA.h 0, and select a corresponding power-on duration adjustment coefficient according to a comparison result of the ratio Bh and a preset width difference ratio to adjust the power-on duration of the diode-based combinational circuit when the time-domain pulse signal is unqualified and Δ H < [ delta ] H0, the control module sets the adjusted power-on duration as T1, and sets T1 as T × Khi, where T1 is an initial power-on duration of the diode-based combinational circuit and Khi is a power-on market adjustment coefficient;

the control module is further configured to calculate a ratio Bf between the pulse amplitude difference Δ F and a preset pulse amplitude difference Δ F0 when the time domain pulse signal is unqualified and Δ F is less than Δ F0, set Bf/. DELTA.f 0, and select a corresponding adjustment coefficient to adjust a resistance value of the turning point control circuit according to a comparison result between the ratio and the preset amplitude difference ratio, and set the adjusted resistance value as R1 and R1 as R × Kfj, where R is an initial resistance value of the turning point control circuit and Kfj is a resistance value adjustment coefficient.

5. The novel ultra-wideband sensor time-domain signal device as claimed in claim 4, wherein the control module is further provided with a maximum power-on duration Tmax, the control module is further configured to compare the adjusted power-on duration T1 with the maximum power-on duration when the adjustment of the power-on market is completed, if T1 > Tmax, the control module calculates a duration difference Δ T between the power-on duration T1 and the maximum power-on duration Tmax, sets Δ T1-Tmax, and selects a corresponding duty ratio adjustment coefficient according to a comparison result of the duration difference and a preset duration difference to adjust the duty ratio of the monostable circuit, the control module sets the adjusted duty ratio to D1, sets D1 to D × Ktn, where D is an initial duty ratio of the monostable circuit, and Ktn is the duty ratio adjustment coefficient.

6. The novel ultra-wideband sensor time-domain signal device of claim 1, wherein the monostable circuit comprises at least one capacitor, at least two transistors and at least four resistors and is powered by a negative level, wherein a second resistor, a third resistor and a fifth resistor are connected in parallel and are respectively connected with the negative level power supply circuit, the second resistor is connected in series with the second transistor and is connected with the trigger signal circuit, the third resistor is connected in series with the third transistor and is connected with the start signal circuit through a fourth resistor, a second capacitor is arranged between the second resistor and the third resistor, the second transistor and the third transistor are respectively grounded, and the monostable circuit is used for converting the duty cycle of the trigger signal into an adjustable sharp pulse.

7. The novel ultra-wideband sensor time-domain signal device of claim 6, wherein said emitter follower comprises at least one transistor and at least two resistors, said emitter follower is connected to said monostable and a coupling capacitor is connected in parallel between said emitter follower and said monostable, wherein a fourth transistor is connected in parallel with said sixth resistor, said fourth transistor is connected to a seventh resistor and grounded, said emitter follower adjusts output current to increase output power, said emitter follower is used to output square wave signal.

8. The novel ultra-wideband sensor time-domain signal device of claim 7, wherein the diode-based combination circuit is a combination of parallel and series connected diodes, and comprises at least one capacitor, at least one resistor, at least two diodes, and at least three inductors, and is powered by a negative level, wherein a fourth capacitor is connected in series with a first inductor, a third inductor, and a sixth transistor, a fifth transistor is connected in parallel between the first inductor and the third inductor and grounded, the third inductor is connected in series with the sixth transistor, and a second inductor and an eighth resistor are arranged on the power supply circuit and connected to the third inductor and the sixth transistor.

9. The novel ultra-wideband sensor time-domain signal device of claim 8, wherein the parallel diodes generate sharp rising edges and the series diodes generate falling edges.

10. The novel ultra-wideband sensor time-domain signal device of claim 9, wherein said turning point control circuit is connected to said combining circuit and includes at least one ninth resistor connected to said sixth transistor and connected to ground, said resistor being connected in parallel to said circuit, said output diode network being connected to said turning point control circuit, said output diode network including at least one capacitor and at least one transistor, said diode adjusting the transition time according to the ratio of forward current to reverse current.

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