CN103760541A - Interference waveform self-adaptation offset method and device for continuous wave detection - Google Patents
Interference waveform self-adaptation offset method and device for continuous wave detection Download PDFInfo
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- 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
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- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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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
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- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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Abstract
The invention discloses an interference waveform self-adaptation offset method for continuous wave detection. The method comprises the first step of performing initializing; the second step of shielding a target echo signal; the third step of carrying out transmitting, receiving and primary offset; the fourth step of judging whether a detection period includes training time or not, wherein if yes, a detection target echo is shielded, and the fifth step is executed, and if not, the shielding on a detection target is cancelled, and the sixth step is executed; the fifth step of carrying out training, namely, a digital signal processing module trains an interference transfer function according to a sent signal and the echo signal and executes the third step; the sixth step of carrying out secondary offset. The invention further discloses an interference waveform self-adaptation offset device for continuous wave detection. The device comprises a transmitting module, a transmitting antenna, a receiving antenna, an interference offset module, a receiving processing module and the digital signal processing module. The method and device have the advantages of being high in electrical level self-adaptation, good in effect, convenient to achieve, capable of achieving the system easily, stable, reliable and the like.
Description
Technical field
The present invention relates to a kind of continuous wave Detection Techniques, particularly a kind of continuous wave is surveyed interference waveform adaptive cancellation method and device.
Background technology
Along with developing rapidly of electronic information technology, wireless exploration has been widely used in detection and the early warning of all kinds of infrastructure such as railway traffic, power equipment, bridge construction, the industrial product qualitys such as aircraft, auto parts and components, pressure vessel, oil and gas pipes detect, all conglomeraties such as bio-tissue detection and early warning, are bringing into play irreplaceable effect in every field such as national defense construction, national economy, people's lives and science and technology.
Continuous wave wireless exploration has certain superiority compared with other forms of detectable signal.First continuous wave is surveyed wide amassing while having larger pulsewidth, thereby has higher sensitivity and range resolution, can measure very near distance, and average transmit power is low; Secondly, can adopt solid state microwave source to replace electron tube, sensitive detection parts volume is little, lightweight.
But continuous wave is surveyed in use, exist the root problem of its development of restriction, i.e. the leakage problem of signal.From transmission channel, reveal transmit by force, the strong echoed signal of close-in target and the strong reflection signal of antenna house can cause and have a strong impact on receiver performance.For example, the distance of receiving cable and transmission channel is closer, if isolation is lower, transmits by force and is released into receiver, puts saturatedly in can causing, even makes microwave mixer or pre-low-noise amplifier saturated.In addition, the echo amplitude of close-in target is large, also can make the saturation of receiver work or to flood distant object frequency spectrum and reduce radar range.
The method that existing solution continuous wave is revealed mainly contains: 1) isolation: improve the isolation between dual-mode antenna, reduce the leakage of microwave device; 2) suppress: select some to transmit, as sinusoidal FM signal and make receiver select the higher hamonic wave of echoed signal suppress reveal; 3) offset: based on the various cancellation techniques of hardware system, adopt that suitable amplitude and phase tranformation obtain equating with the co-channel interference signal amplitude of receiver end, single spin-echo offset signal, and undesired signal offsets.
But, with current engineering level, solve continuous wave and reveal a lot of difficulties of also existence:
1) transmitting-receiving of microwave device isolation is difficult to do very highly;
2) select sinusoidal FM signal to survey, receiver selects some harmonic component of echoed signal can make the energy of echoed signal have larger loss;
3) adjustment that traditional cancellation techniques is carried out simple amplitude and phase place to transmitting offseted with undesired signal afterwards, and precision is low, bad adaptability; And current cancellation techniques needs the A/D conversion of multichannel mostly, and hardware requirement is higher.A kind of continuous wave radar feed-through nulling system and method have been proposed in patent CN102023292, signal is divided into in-phase signal I component and orthogonal signal Q component, the real-time estimation of the method need to offset I component and the Q component level of signal, in two passages, respectively signal is compensated.The method relatively realizes the estimation of interference level by hardware, need multi-channel A/D and D/A, realize comparatively complicated, and estimate level approximation signal wave form varies in real time.
Summary of the invention
Primary and foremost purpose of the present invention is to overcome the deficiency of existing continuous wave leakage cancellation techniques, propose a kind of continuous wave and survey interference waveform adaptive cancellation method, the method first estimates the transport function of EVAC (Evacuation Network Computer Model) in detection adaptively, according to transmitting, obtain the estimated value of undesired signal with this transport function, at reception & disposal front end, complete undesired signal one-level and offset, at signal processing module, complete undesired signal secondary and offset.
Another object of the present invention is to overcome the deficiency of existing continuous wave leakage cancellation techniques, propose a kind of device of realizing continuous wave detection interference waveform adaptive cancellation method, this device can be eliminated interference better.
Primary and foremost purpose of the present invention is achieved through the following technical solutions: a kind of continuous wave is surveyed interference waveform adaptive cancellation method, comprises the following steps:
1, initialization: system boot, wireless exploration systemic presupposition initial interference ssystem transfer function, execution step 2;
2, shielding target echo signal, that is: make system works under the environment that there is no target echo;
3, transmitting, reception and one-level are offset: the digital signal processing module in wireless exploration system produces continuous wave signal, and this signal is sent into transmitter module, simultaneously, signal processing module carries out convolution by detectable signal and EVAC (Evacuation Network Computer Model) transport function and obtains undesired signal waveform and deliver to Interference Cancellation module, sends into one end of subtracter after D/A transducer; Meanwhile, by receiving antenna, receive echo to Interference Cancellation module, after low-pass filtering, enter the other end of subtracter; The undesired signal waveform that echoed signal and estimation obtain is realized and being offset by subtracter hardware, be i.e. one-level Interference Cancellation; By the echoed signal supplied with digital signal processing module after down conversion module, filter amplifier and A/D converter completing after one-level Interference Cancellation;
4, judge whether the training time in detect cycle, if so, shield detection of a target echo, and perform step 5; If not, cancel the shielding to the detection of a target, execution step 6;
5, training: digital signal processing module is according to sending signal and echoed signal training disturbance transfer function, execution step 3;
6, secondary is offset: digital signal processing module judges in echoed signal whether comprise target echo, carries out the counteracting of software secondary if comprise, and the signal after secondary is offset can be used for subsequent treatment, and performs step 3; If do not comprise, execution step 5.
Continuous wave of the present invention is surveyed in interference waveform adaptive cancellation method, and each detect cycle is divided into training time T1 and detection time T2.
In training time T1, utilize transmit and receive signal digital signal processing module adaptively training study obtain EVAC (Evacuation Network Computer Model) transport function.Described EVAC (Evacuation Network Computer Model) transport function is to describe after transmission antennas transmit signal, the transport function of direct wave and the channel that environment echo experiences nearby.This transport function comprised transmit in directly from emitting antenna be leaked to receiving antenna and nearby environment echo on the impact transmitting.Process is: shielding detection of a target echo, by digital signal processing module, produce digital continuous wave signal and send into transmitter module, default EVAC (Evacuation Network Computer Model) transport function initial value simultaneously, obtains undesired signal estimation waveform by digital signal processing module by continuous wave signal and the effect of EVAC (Evacuation Network Computer Model) transport function initial value convolution and sends into Interference Cancellation module.Continuous wave signal is sent into transmitter module, through D/A, is converted to analog baseband signal, and up-converter module to required radiofrequency signal, after low-pass filter and power amplifier, radiate signal up-conversion by emitting antenna.Receiving antenna receives echoed signal, and this signal is input to Interference Cancellation module.In the subtracter of Interference Cancellation module, echoed signal disappears mutually with the undesired signal estimation waveform through D/A conversion, and the signal after Interference Cancellation, through down conversion module, filter amplifier and the A/D conversion of receiving processing module, is input to digital signal processing module.Digital signal processing module, according to the echoed signal of transmitting continuous wave signal and input, utilizes software algorithm to solve EVAC (Evacuation Network Computer Model) transport function.
In detection time T2, the shielding of cancellation to target echo, by digital signal processing module, produce digital continuous wave signal and send into transmitter module, the estimation waveform that simultaneously continuous wave signal and EVAC (Evacuation Network Computer Model) transport function (the up-to-date EVAC (Evacuation Network Computer Model) transport function obtaining in the training time) convolution effect is obtained to undesired signal is sent into Interference Cancellation module.Continuous wave signal is sent into transmitter module, through D/A, is converted to analog baseband signal, and up-converter module to required radiofrequency signal, after low-pass filter and power amplifier, radiate signal up-conversion by emitting antenna.Receiving antenna receives echoed signal, and this signal is input to Interference Cancellation module.In Interference Cancellation module, undesired signal is inputted one end of subtracter after D/A conversion, disappear mutually with the echoed signal waveform of the input subtracter other end, complete one-level Interference Cancellation, signal after Interference Cancellation, through down coversion, filter and amplification and the A/D conversion of receiving processing module, is input to digital signal processing module.Signal after one-level Interference Cancellation is calculated and is carried out secondary Interference Cancellation by software in digital signal processing module.
Another object of the present invention is achieved through the following technical solutions: a kind of device of realizing continuous wave detection interference waveform adaptive cancellation method, comprising: transmitter module, emitting antenna, receiving antenna, Interference Cancellation module, receiving processing module and digital signal processing module.Described transmitter module comprises D/A converter, low-pass filter, up-converter module, power amplifier.Interference Cancellation module comprises D/A converter, low-pass filter and subtracter.Receiving processing module comprises down conversion module, filter amplifier and A/D converter.A/D and D/A converter are realized the conversion between analog and digital signal, D/A converter converts the digital signal of digital signal processing module output to analog electrical signal, and A/D converter converts analog electrical signal to digital signal and sends to digital signal processing module; The low-pass filtering of low-pass filter settling signal, filter away high frequency noise; Down conversion module becomes low frequency baseband signal by high-frequency signal, and up-converter module is for becoming high-frequency signal by low frequency baseband signal.
Principle of work of the present invention: the present invention produces transmitting continuous wave signal output by software algorithm; In the training time of each detect cycle, utilize the learning algorithm training such as neural network to obtain EVAC (Evacuation Network Computer Model) transport function; At each detect cycle, according to EVAC (Evacuation Network Computer Model) transport function and transmit calculating undesired signal output; The method of calculating by software realizes interference waveform secondary and offsets.
The present invention has following advantage and effect with respect to prior art:
(1) self-adaptation is estimated EVAC (Evacuation Network Computer Model) transport function, provides undesired signal waveform to eliminate, and than only adopting phase and magnitude or carrying out level, offsets strong adaptability, effective;
(2) when eliminating interference, can not weaken target reflection wave;
(3) process front end, before echoed signal enters into power amplifier and A/D conversion, just initiatively offsetting undesired signal, effectively avoiding operational amplifier, power amplifier and A/D conversion saturated;
(4) after signal supplied with digital signal processing module, carry out hardware and software two-stage and offset, can eliminate better interference.
(5) system only needs a road A/D conversion, and A/D converter is required to decline, and required A/D dynamic range is little, and it is convenient to realize.
(6) system realizes simple, reliable and stable.
Accompanying drawing explanation
Fig. 1 a realizes the initiatively system construction drawing of adaptive cancellation method of undesired signal of the present invention.
Fig. 1 b is the structural drawing of transmitter module.
Fig. 1 c is the structural drawing of interference cancellation module.
Fig. 1 d is the structural drawing of receiving processing module.
Fig. 2 is the distribution diagram of detect cycle.
Fig. 3 is the workflow block diagram of system of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1a, be the initiatively system construction drawing of adaptive cancellation method of undesired signal of the present invention.This system comprises transmitter module, emitting antenna, receiving antenna, interference cancellation module, receiving processing module and digital signal processing module.Be the structural drawing of transmitter module as shown in Figure 1 b, as Fig. 1 c is depicted as the structural drawing of interference cancellation module, be the structural drawing of receiving processing module as shown in Figure 1 d, transmitter module is comprised of D/A converter, up-converter module, low-pass filtering module, power amplifier, and interference cancellation module has low-pass filter and subtracter.Receiving processing module comprises down conversion module, filter amplifier and A/D converter.Digital signal processing module is all connected with transmitter module, interference cancellation module, receiving processing module.The digital electric signal that D/A converter in transmitter module produces digital signal processing module converts simulating signal to; Up-converter module is connected with D/A modular converter, by extremely needed radiofrequency signal of simulating signal up-conversion; Radiofrequency signal is carried out low-pass filtering through low-pass filter, and after power amplifier by emitting antenna radiation.Receiving antenna receives after echoed signal, input interference cancellation module.Meanwhile, digital signal processing module obtains undesired signal according to EVAC (Evacuation Network Computer Model) transport function with transmitting, and inputs interference cancellation module.In interference cancellation module, through the echoed signal of low-pass filtering and the undesired signal through D/A converter, by subtracter, offset, the signal of subtracter output is input to receiving processing module, in receiving processing module signal supplied with digital signal processing module after down conversion module, filter amplifier and A/D converter.
As shown in Figure 2, be the distribution diagram of detect cycle.The front T1(of detect cycle is for example: get 30ms) time, the described system mask detection of a target, training study obtains real-time EVAC (Evacuation Network Computer Model) transport function.After detect cycle, T2(is for example: 70ms) time, described system is worked under detection of a target environment.Each detect cycle, all training study EVAC (Evacuation Network Computer Model) transport functions adaptively of system.The detection time T2 of each detect cycle, digital signal processing module judges in the signal receiving whether comprise target echo, if do not comprise, these data also can be for training EVAC (Evacuation Network Computer Model) transport function.
The generation that system transmits, the transport function training study of EVAC (Evacuation Network Computer Model) and undesired signal estimate that the calculating of waveform all realizes at digital signal processing unit.
Described preset EVAC (Evacuation Network Computer Model) transport function initial value, can adopt the last training result of system as initial value or by all-pass system transport function as initial value.
As shown in Figure 3, be to realize continuous wave to survey the FB(flow block) of disturbing active adaptive cancellation method.We illustrate realization flow of the present invention by reference to the accompanying drawings below:
Step 1: initialization: system starts, at the preset EVAC (Evacuation Network Computer Model) transport function of digital signal processing module h (n);
Step 2: system mask detection of a target echo;
Step 3: transmitting, reception and one-level Interference Cancellation: digital signal processing module produces single-frequency continuous wave signal x (n), delivers to transmitter module; Meanwhile, calculate undesired signal estimated value:
X
disturb(n)=x (n) * h (n), (formula 1)
Undesired signal estimated value obtains x after changing by D/A
disturb(t) deliver to Interference Cancellation module.Receiving antenna receives signal and delivers to Interference Cancellation module, echoed signal y
r(t) and undesired signal estimate waveform at subtracter place, subtract each other, obtain the signal y after one-level Interference Cancellation
1(t):
Y
1(t)=y
r(t)-x
disturb(t), (formula 2)
If the error that analog subtracter causes is Δ (t).Signal y after Interference Cancellation
1(t) through receiving processing module, digital signal y after treatment (n) arrives digital signal processing module;
Step 4: judge whether the training time in detect cycle, if so, shield detection of a target echo, execution step 5; If not, detection system is cancelled target echo shielding, execution step 6;
Step 5: training study: digital signal processing module is according to the signal x (n) producing and the signal y (n) receiving, utilize neural network algorithm training study, obtain ssystem transfer function h (n), according to system chart, known:
Y (n)=[x (n) * h
1(n)-x (n) * h (n)] * h
2(n), (formula 3)
Wherein, h
1(n) refer to transmitter module, emitting antenna, wireless transmission channel, receiving antenna and disturb the transport function of the channel that the low-pass filtering module before eliminating forms, h
2(n) refer to the ssystem transfer function of receiving processing module, the target of training is to make in the situation that there is no target echo, signal y (n) the energy minimum that digital signal processing module receives, that is:
The known x of digital signal processing module (n) and y (n), iterative formula (4), obtains h (n), and mushing error is:
e(n)=y(n)-[x(n)*h
1(n)-x(n)*h(n)]*h
2(n)，
Execution step 3;
Step 6: secondary Interference Cancellation: judge whether to contain target echo at digital signal processing unit.If there is no target echo, execution step 5; If have, by software, calculate and obtain secondary counteracting y
2(n) algorithm that, secondary is offset is:
y
2(n)=y(n)-Δ(n)*h
2(n)，
Signal after Interference Cancellation can be used for subsequent treatment, detection system execution step 3.
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (6)
1. continuous wave is surveyed an interference waveform adaptive cancellation method, it is characterized in that, comprises the following steps:
Step 1, initialization: system boot, wireless exploration systemic presupposition initial interference ssystem transfer function, execution step 2;
Step 2, shielding target echo signal;
Step 3, transmitting, reception and one-level are offset;
Step 4, judge whether the training time in detect cycle if so, to shield detection of a target echo, and perform step 5; Otherwise, cancel the shielding to the detection of a target, execution step 6;
Step 5, training: digital signal processing module is according to sending signal and echoed signal training disturbance transfer function, execution step 3;
Step 6, secondary are offset: digital signal processing module judges in echoed signal whether comprise target echo, if comprise, carries out the counteracting of software secondary, and the signal after secondary is offset can be used for subsequent treatment, and performs step 3; Otherwise, execution step 5.
2. continuous wave according to claim 1 is surveyed interference waveform adaptive cancellation method, it is characterized in that, described step 3 comprises the following steps:
Digital signal processing module in step 3-1, wireless exploration system produces continuous wave signal, and this signal is sent into transmitter module, simultaneously, signal processing module carries out convolution by detectable signal and EVAC (Evacuation Network Computer Model) transport function and obtains undesired signal waveform and deliver to Interference Cancellation module, sends into one end of subtracter after D/A transducer; And, by receiving antenna, receive echo to Interference Cancellation module, after low-pass filtering, enter the other end of subtracter;
The undesired signal waveform that step 3-2, echoed signal and estimation obtain is realized and being offset by subtracter hardware, that is: one-level Interference Cancellation;
Step 3-3, by the echoed signal supplied with digital signal processing module after down conversion module, filter amplifier and A/D converter completing after one-level Interference Cancellation.
3. continuous wave according to claim 1 is surveyed interference waveform adaptive cancellation method, it is characterized in that, in step 4, each described detect cycle is divided into training time T1 and detection time T2.
4. continuous wave according to claim 3 is surveyed interference waveform adaptive cancellation method, it is characterized in that, in described training time T1, utilize transmit and receive signal digital signal processing module adaptively training study obtain EVAC (Evacuation Network Computer Model) transport function; Described EVAC (Evacuation Network Computer Model) transport function is to describe after transmission antennas transmit signal, the transport function of direct wave and the channel that environment echo experiences nearby; Described transport function comprised transmit in directly from emitting antenna be leaked to receiving antenna and nearby environment echo on the impact transmitting; Process is: shielding detection of a target echo, by digital signal processing module, produce digital continuous wave signal and send into transmitter module, default EVAC (Evacuation Network Computer Model) transport function initial value simultaneously, obtains undesired signal estimation waveform by digital signal processing module by continuous wave signal and the effect of EVAC (Evacuation Network Computer Model) transport function initial value convolution and sends into Interference Cancellation module; Continuous wave signal is sent into transmitter module, through D/A, is converted to analog baseband signal, and up-converter module to required radiofrequency signal, after low-pass filter and power amplifier, radiate signal up-conversion by emitting antenna; Receiving antenna receives echoed signal, and this signal is input to Interference Cancellation module; In the subtracter of Interference Cancellation module, echoed signal disappears mutually with the undesired signal estimation waveform through D/A conversion, and the signal after Interference Cancellation, through down conversion module, filter amplifier and the A/D conversion of receiving processing module, is input to digital signal processing module; Digital signal processing module, according to the echoed signal of transmitting continuous wave signal and input, utilizes software algorithm to solve EVAC (Evacuation Network Computer Model) transport function.
5. continuous wave according to claim 3 is surveyed interference waveform adaptive cancellation method, it is characterized in that, in described detection time T2, the shielding of cancellation to target echo, by digital signal processing module, produce digital continuous wave signal and send into transmitter module, the estimation waveform that simultaneously continuous wave signal and the effect of EVAC (Evacuation Network Computer Model) transport function convolution is obtained to undesired signal is sent into Interference Cancellation module; Continuous wave signal is sent into transmitter module, through D/A, is converted to analog baseband signal, and up-converter module to required radiofrequency signal, after low-pass filter and power amplifier, radiate signal up-conversion by emitting antenna; Receiving antenna receives echoed signal, and this signal is input to Interference Cancellation module; In Interference Cancellation module, undesired signal is inputted one end of subtracter after D/A conversion, disappear mutually with the echoed signal waveform of the input subtracter other end, complete one-level Interference Cancellation, signal after Interference Cancellation, through down coversion, filter and amplification and the A/D conversion of receiving processing module, is input to digital signal processing module; Signal after one-level Interference Cancellation is calculated and is carried out secondary Interference Cancellation by software in digital signal processing module.
6. a device of realizing continuous wave detection interference waveform adaptive cancellation method claimed in claim 1, is characterized in that, comprising: transmitter module, emitting antenna, receiving antenna, Interference Cancellation module, receiving processing module and digital signal processing module;
Described transmitter module comprises D/A converter, low-pass filter, up-converter module and power amplifier;
Described Interference Cancellation module comprises D/A converter, low-pass filter and subtracter;
Described receiving processing module comprises down conversion module, filter amplifier and A/D converter; A/D and D/A converter are realized the conversion between analog and digital signal, D/A converter converts the digital signal of digital signal processing module output to analog electrical signal, and A/D converter converts analog electrical signal to digital signal and sends to digital signal processing module; Low-pass filter is for low-pass filtering and the filter away high frequency noise of settling signal;
Described down conversion module is for high-frequency signal is become to low frequency baseband signal, and described up-converter module is for becoming high-frequency signal by low frequency baseband signal.
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