CN109541605A - A method of single-frequency sound signal tranmitting frequency is reduced to improve target identification ability - Google Patents
A method of single-frequency sound signal tranmitting frequency is reduced to improve target identification ability Download PDFInfo
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- CN109541605A CN109541605A CN201811349544.3A CN201811349544A CN109541605A CN 109541605 A CN109541605 A CN 109541605A CN 201811349544 A CN201811349544 A CN 201811349544A CN 109541605 A CN109541605 A CN 109541605A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/539—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The present invention provides a kind of method for reducing single-frequency sound signal tranmitting frequency to improve target identification ability.This method comprises: to objective emission acoustical signal；Receives echo-signal；Judge environment category: simple environment directly handles echo-signal, and echo-signal is transmitted to frequency reducing judgment module by complex environment；Judge the size of frequency shift amount and given value: frequency shift amount, which is less than or equal to given value, directly will directly handle echo-signal, and frequency shift amount is greater than given value and echo-signal is transmitted to frequency reducing compensating module；Calculate new signal tranmitting frequency；Acoustical signal of the signal emission module to objective emission reduced frequency rate.The mode of looking for food of some bats in natural imitation circle of the present invention, reduce single-frequency sound signal tranmitting frequency, compensate Doppler frequency shift in echo, it can be reduced the bit error rate, raising makes receiver performance, enhances diffracting power, the penetration capacity of sound wave, reduces the propagation loss decaying of signal, enable the farther Distance Transmission of signal, enhances to target identification ability.
Description
Technical field
The present invention relates to signal processings and field of target recognition, more particularly to a kind of reduction single-frequency sound signal tranmitting frequency
Method to improve target identification ability.
Background technique
In nature, bat has outstanding sound processing capabilities, studies have found that emit CF signal as its sound
When the bat (Schnitzler, 1968) of system main operation modes is looked for food in dense leaf, some of bats exist
The frequency of sonar sounding can be reduced when flight.
On the one hand, in the case where the velocity of sound is constant, wave length of sound and frequency are inversely.Wavelength is longer, the diffraction of wave
Ability, penetration capacity are stronger, signal propagation loss decaying it is smaller, transmission range it is remoter, it can be achieved that signal wide covering.Another party
Face, the sound wave of object radiation is long to generate variation because of the relative motion of wave source and observer, to generate observing frequency variation.?
In system using acoustical signal communication, due to sound, spread speed is slow in water or in air, opposite fortune existing for receiving-transmitting sides
It is dynamic to generate Doppler frequency shift in data receiver.Particularly, it if receiving-transmitting sides speed of related movement is larger, will generate larger
Doppler frequency shift amount, decline receiver performance, influence communication performance.
Summary of the invention
In view of this, the present invention provides a kind of reduction single-frequency sound signal tranmitting frequency to improve the side of target identification ability
Method, and then improve sound communication ability.
The technical solution adopted by the present invention to solve the technical problems is: a kind of reduction single-frequency sound signal tranmitting frequency is to mention
The method of high target identification ability, comprising: signal emission module is to objective emission acoustical signal, wherein handled acoustical signal passes
Broadcasting medium includes water, air etc.；Signal receiving module receives echo-signal, the echo-signal that will acquire reach environment and judge mould
Block；Environment judgment module analyzes ultrasonic echo feature, judges environment category: echo-signal is directly transmitted at signal by simple environment
Module is managed, echo-signal is transmitted to frequency reducing judgment module by complex environment；Frequency reducing judgment module calculates the frequency shift amount of echo-signal, sentences
The size of disconnected frequency shift amount and given value: frequency shift amount is less than or equal to given value and echo-signal is directly transmitted to signal processing module, frequency
Shifting amount is greater than given value and echo-signal is transmitted to frequency reducing compensating module；Frequency reducing compensating module calculates new signal tranmitting frequency,
New signal tranmitting frequency parameter is reached into signal emission module；Signal emission module is believed to the sound of objective emission reduced frequency rate
Number.
The beneficial effects of the present invention are: a kind of reduction single-frequency sound signal tranmitting frequency of the present invention is to improve target identification ability
Method can be main as its Sonar system to emit CF signal in natural imitation circle when identifying target in complex environment
The bat of operating mode is looked for food mode, and communication capacity is improved: being reduced single-frequency sound signal tranmitting frequency, is enhanced the diffraction energy of sound wave
Power, penetration capacity reduce the propagation loss decaying of signal, enable the farther Distance Transmission of signal, the object in extensive overlay environment；
Spread speed is slow in water or in air for sound, and relative motion existing for receiving-transmitting sides will generate Doppler's frequency in data receiver
It moves, target is reduced far from one's own side, echo frequency, and gtoal setting one's own side, echo frequency is got higher.In practice, when carrying out target identification,
Priority processing compensates Doppler frequency shift in echo, is sampling close to the target of one's own side by reducing single-frequency sound signal tranmitting frequency
In the case that rate is constant, the bit error rate can be reduced, raising makes receiver performance, enhances to target identification ability.
To enable above-mentioned purpose of the invention, feature and technical solution to be clearer and more comprehensible, preferred embodiment is cited below particularly, and
Cooperate appended attached drawing, is described in detail below.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the present invention reduces single-frequency sound signal tranmitting frequency system；
Fig. 2 is that the present invention reduces method flow schematic diagram of the single-frequency sound signal tranmitting frequency to improve target identification ability.
Specific embodiment
To keep the purpose, feature and technical solution of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
Middle attached drawing, technical solution in the embodiment of the present invention are clearly described, it is clear that described embodiment is only the present invention one
Section Example, instead of all the embodiments.The group for the embodiment of the present invention for usually describing and showing in attached drawing here
Part module can be arranged and be designed with a variety of different configurations.Therefore, the implementation of the invention to providing in the accompanying drawings below
The detailed description of example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.
Fig. 1 is the structural schematic diagram that the present invention reduces single-frequency sound signal tranmitting frequency system, as shown in Figure 1, packet of the present invention
It includes: signal emission module 201；Signal receiving module 202；Environment judgment module 203；Frequency reducing judgment module 204；Frequency reducing compensates mould
Block 205；Signal processing module 206.
Referring to the structure of above system, the embodiment of the invention provides a kind of reduction single-frequency sound signal tranmitting frequencies to improve
The method of target identification ability, Fig. 2 are that the present invention reduces method of the single-frequency sound signal tranmitting frequency to improve target identification ability
Flow diagram, this method comprises the following steps:
Step S10, signal emission module is to objective emission acoustical signal, wherein handled acoustic signal propagation medium includes
Water, air etc.；
Transmitting acoustical signal is pure-tone pulse signal, and the plural form for emitting signal can be represented simply as u (t)=exp (2 π of j
f0T), f in above-mentioned formula0Indicate transmitting signal original frequency.
Step S11, signal receiving module receives echo-signal, the echo-signal that will acquire reach environment judgment module；
Step S12, environment judgment module analyze ultrasonic echo feature, judge environment category: simple environment is directly by echo
Signal is transmitted to signal processing module, and echo-signal is transmitted to frequency reducing judgment module by complex environment；
In practice, simple environment and complex environment are an opposite concepts, because according to different operating mode and task,
By the clutter information etc. in analysis echo-signal, local environment feature is judged.
Step S13, frequency reducing judgment module calculate the frequency shift amount of echo-signal, judge the size of frequency shift amount and given value: frequency
Shifting amount is less than or equal to given value and echo-signal is directly transmitted to signal processing module, and frequency shift amount is greater than given value and passes echo-signal
Give frequency reducing compensating module；
Specifically, echo-signal observing frequency can be released according to Doppler frequency shift phenomenon
C is sound in air or water transmission speed, voFor the movement speed of observer's relative medium, vsFor the shifting of target relative medium
Dynamic speed, the frequency displacement variable quantity of observationIn practice, it is situated between since target is opposite
The movement speed v of mattersIt is unknown quantity, frequency displacement computing module need to carry out Fourier transformation to the echo-signal received, to count
Echo-signal is directly transmitted to signal as △ f≤K by the frequency displacement variable quantity △ f for calculating echo-signal observing frequency f ' and observation
Processing module, wherein K is given value, and the value of K is depending on different operating mode and task, as △ f > K, by echo-signal
It is transmitted to frequency reducing compensating module.
Step S14, frequency reducing compensating module calculate new signal tranmitting frequency, and new signal tranmitting frequency parameter is reached
Signal emission module；
Generally, it is known that frequency displacement variable quantity △ f can be easy to obtain signal tranmitting frequency f new after changing0'=f0- △ f,
And then new signal tranmitting frequency parameter is reached into signal emission module and prepares transmitting.
Step S15, acoustical signal of the signal emission module to objective emission reduced frequency rate；
The plural form of the transmitting signal of reduced frequency can be represented simply as u (t)=exp (2 π f of j0′t)。
The above description is merely a specific embodiment, and the present invention can also have other various embodiments, but the present invention
Protection scope be not limited thereto, anyone skilled in the art in the technical scope disclosed by the present invention,
It can easily think of the change or the replacement, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of method for reducing single-frequency sound signal tranmitting frequency to improve target identification ability characterized by comprising
Signal emission module is to objective emission acoustical signal, wherein handled acoustic signal propagation medium includes water, air etc.；
Signal receiving module receives echo-signal, the echo-signal that will acquire reach environment judgment module；
Environment judgment module analyzes ultrasonic echo feature, judges environment category: echo-signal is directly transmitted to signal by simple environment
Echo-signal is transmitted to frequency reducing judgment module by processing module, complex environment；
Frequency reducing judgment module calculates the frequency shift amount of echo-signal, and judge the size of frequency shift amount and given value: frequency shift amount is less than or equal to
Echo-signal is directly transmitted to signal processing module by given value, and frequency shift amount is greater than given value and echo-signal is transmitted to frequency reducing compensation mould
Block；
Frequency reducing compensating module calculates new signal tranmitting frequency, and new signal tranmitting frequency parameter is reached signal transmitting mould
Block；
Acoustical signal of the signal emission module to objective emission reduced frequency rate.
2. the method according to claim 1, wherein the signal emission module is to objective emission acoustical signal,
In, handled acoustic signal propagation medium includes water, air etc., comprising:
Transmitting acoustical signal is pure-tone pulse signal.
3. sentencing the method according to claim 1, wherein the environment judgment module analyzes ultrasonic echo feature
Disconnected environment category: echo-signal is directly transmitted to signal processing module by simple environment, and echo-signal is transmitted to frequency reducing by complex environment
Judgment module, comprising:
Simple environment and complex environment are an opposite concepts, because according to different operating mode and task, by analyzing back
Clutter information in wave signal etc. judges local environment feature.
4. the method according to claim 1, wherein the frequency reducing judgment module calculates the frequency displacement of echo-signal
Amount, judge the size of frequency shift amount and given value: frequency shift amount is less than or equal to given value and echo-signal is directly transmitted to signal processing mould
Block, frequency shift amount are greater than given value and echo-signal are transmitted to frequency reducing compensating module, comprising:
Frequency displacement computing module need to carry out Fourier transformation to the echo-signal received, to calculate echo-signal observing frequency
Echo-signal is directly transmitted to signal processing module as △ f≤K by f ' and the frequency displacement variable quantity △ f of observation, and wherein K is given
Value, the value of K is depending on different operating mode and task, and as △ f > K, echo-signal is transmitted to frequency reducing compensating module.
5. the method according to claim 1, wherein the frequency reducing compensating module calculates new signal transmitting frequency
New signal tranmitting frequency parameter is reached signal emission module by rate, comprising:
Known frequency shift variable quantity △ f can be easy to obtain signal tranmitting frequency f ' new after changing0=f0- △ f, and then by new letter
Number emission frequency parameter reaches signal emission module and prepares transmitting.
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| CN110133662A (en) * | 2019-05-05 | 2019-08-16 | 西北工业大学 | A kind of bionic array design method receiving sound field based on bat |
| CN110208813A (en) * | 2019-05-28 | 2019-09-06 | 西北工业大学 | One kind is by changing acoustic signals wavelength recognition mesh calibration method |
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