CN109672494A - WIFI signal suppressing method and device in a kind of unmanned plane test platform - Google Patents
WIFI signal suppressing method and device in a kind of unmanned plane test platform Download PDFInfo
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- CN109672494A CN109672494A CN201910027318.1A CN201910027318A CN109672494A CN 109672494 A CN109672494 A CN 109672494A CN 201910027318 A CN201910027318 A CN 201910027318A CN 109672494 A CN109672494 A CN 109672494A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/102—Power radiated at antenna
Abstract
The present invention relates to WIFI signal suppressing method and devices in a kind of unmanned plane test platform, comprising the following steps: carries out signal detection to unmanned plane, obtains the power of detection signal；The power that will test signal is compared with power threshold, and whether judged to detect in signal according to comparison result includes WIFI signal, is filtered if including to detection signal.I.e. present invention reduces the false alarm rates of unmanned plane detection system, improve the accuracy of detecting, promote the detection performance of unmanned plane test platform.
Description
Technical field
The invention belongs to wireless signal processing technology fields, and in particular to WIFI signal suppression in a kind of unmanned plane test platform
Method and device processed.
Background technique
As the development of electronic communication and consumer level unmanned plane use the reduction of threshold, all kinds of unmanned planes not only at
For the emerging professional equipment of every profession and trade, also become popular tool common in general public life, but accordingly due to unmanned plane
Using and the security risk of exposure also more obvious.Therefore also increasingly tighter for the control of the low slow Small objects such as unmanned plane
Lattice.In China, radio detection is a kind of effective means for being commonly used to the low slow Small object of reconnaissance and surveillance, by unmanned plane
The technological means such as signal of communication intercepted and captured, parameter Estimation, direction finding are subsequent information such as the model, the positions that obtain unmanned plane
Interference, net the means such as catches, attacks and providing basis.
Generally unmanned plane is controlled by wireless communication mode in the prior art, but in the sophisticated signals ring such as city
There may be the interference of multiple strong WIFI signals in border, due to the frequency range of WIFI signal and most of UAV Communication signals
Identical, signal modulation style is similar, this will have some impact on the detecting of unmanned plane test platform, causes system that may incite somebody to action
WIFI signal is mistaken for UAV Communication signal, to influence direction finding accuracy, so that false alarm rate increases, influences detection performance.
Summary of the invention
The object of the present invention is to provide WIFI signal suppressing method and devices in a kind of unmanned plane test platform, for solving
Caused to control unstable problem by WIFI signal interference in existing unmanned plane detection process.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
The present invention provides WIFI signal suppressing methods in a kind of unmanned plane test platform, comprising the following steps:
Signal detection is carried out to unmanned plane, obtains the power of detection signal；
The power that will test signal is compared with power threshold, according to comparison result judge detect signal in whether include
WIFI signal is filtered detection signal if including.
The invention has the benefit that the present invention carries out power detection, and the power threshold with setting to unmanned plane signal
The identification that WIFI signal is carried out after being compared, can be avoided the co-channel interference of WIFI signal, to reduce unmanned plane detection
The false alarm rate of system improves the accuracy of detecting, promotes the detection performance of unmanned plane test platform.
Further, in order to more accurately realize WIFI signal identify；The power of signal is detected compared with power threshold
Process includes:
Wherein, σyFor power threshold, the power threshold is that statistics obtains under state no interference signal；σxFor real-time detection
The power of signal；K is setting coefficient.
Further, in order to reduce the false alarm rate of system, system detection efficient is improved；Detection signal is filtered
When, setting and WIFI signal are filtered with the filter of frequency band.
The present invention also provides WIFI signals in a kind of unmanned plane test platform to inhibit device, including processor and storage
Device, the processor are used to execute the instruction of storage in the memory and realize following method:
Signal detection is carried out to unmanned plane, obtains the power of detection signal；
The power that will test signal is compared with power threshold, according to comparison result judge detect signal in whether include
WIFI signal is filtered detection signal if including.
The invention has the benefit that the present invention carries out power detection, and the power threshold with setting to unmanned plane signal
The identification that WIFI signal is carried out after being compared, can be avoided the co-channel interference of WIFI signal, to reduce unmanned plane detection
The false alarm rate of system improves the accuracy of detecting, promotes the detection performance of unmanned plane test platform.
Further, in order to more accurately realize WIFI signal identify；The power of signal is detected compared with power threshold
Process includes:
Wherein, σyTo determine power threshold, the power threshold is that statistics obtains under state no interference signal；σxFor real-time detection
Signal power；K is setting coefficient.
Further, in order to reduce the false alarm rate of system, system detection efficient is improved；Detection signal is filtered
When, setting and WIFI signal are filtered with the filter of frequency band.
Detailed description of the invention
Fig. 1 is the flow chart of WIFI signal suppressing method in unmanned plane test platform of the invention；
Fig. 2 is the flow chart of power differentiation compared with power threshold of detection signal of the invention.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
WIFI signal suppressing method embodiment in unmanned plane test platform:
Since WIFI signal is as a kind of outer signals, UAV system can be detected and generate interference, therefore, carried out
Before unmanned plane detection, first whether there is or not WIFI signals in detection unmanned plane detection system detectable range；If without WIFI signal, directly
Tap into the detection of row unmanned plane；If there is WIFI signal, need to judge whether the WIFI signal has interference to the detection of unmanned plane
It influences.
Wherein, nowadays lower-cost WIFI signal detector or nothing in the market can be used for the detection of WIFI signal
Gauze card.
The case where there are WIFI signals in unmanned plane signal is detected for above-mentioned, and the present invention provides a kind of spies of unmanned plane
WIFI signal suppressing method in platform is surveyed, as shown in Figure 1, WIFI signal suppressing method in the unmanned plane test platform, including with
Lower step:
1, signal detection is carried out to unmanned plane, obtains the power of detection signal；
2, whether the power that will test signal is compared with power threshold, judge to detect in signal according to comparison result and wrap
WIFI signal is included, detection signal is filtered if including.
In UAV system detection, WIFI signal is as a kind of external interference signal, and transmission power is under normal circumstances
It is more constant, but be easy to be blocked by building and generate decaying；Therefore, because the randomness of signal is very strong, it is difficult to reuse phase
The method of pass detects this kind of signal.And the present invention is based on reception system in design, the thermal noise phase of system
To more stable；When there is interference signal to enter, has on energy when can be than state no interference signal on interference band and significantly mention
The noise level of height, i.e. reception system will be raised；And the power of the signal received by detection and obtaining under noiseless situation
To power threshold be compared, can determine whether existing WIFI signal generates interference to the detection of unmanned plane, if noiseless
It is not filtered then, detection signal is filtered if having interference, filters out WIFI signal.Power-threshold in above-described embodiment
The selection of value is detected using energy method and is obtained.Specifically, as shown in Fig. 2, its power and setting for detection signal of the invention
Power threshold compares the flow chart of differentiation.
Wherein, the energy signal under state no interference signal is set as x (t)=s (t)+n (t), there is the energy letter under WIFI signal
Number be x ' (t)=Jn(t)+s(t)+n(t)；S (t) is unmanned plane signal, and n (t) is input noise, JnIt (t) is WIFI signal.
Firstly, carrying out system calibration under noiseless background, under certain condition (in regular hour certain distance), survey
Amount, by repeatedly measuring the signal energy, is obtained without the energy signal x (t) under WIFI interference signal by energy statistics method
The signal power threshold value σ of system and environmental backgroundyNamely power threshold is that statistics obtains under state no interference signal；
Secondly, carrying out the real-time detection of unmanned plane signal in the case where there is WIFI signal, remember that the energy signal of detection is x ' (t),
Similarly, it takes multiple measurements, the power for obtain by energy statistics method the signal of unmanned plane signal is σx。
Then, in specific detection, by the power σ of the unmanned plane signal of real-time detectionxWith power threshold σyIt is compared,
Its comparison procedure includes:
Wherein, coefficient k is configured according to the electromagnetic environment at scene.
There are two important parameters in above-described embodimentAnd k, two parameter determine WIFI signal to unmanned plane signal
Disturbed condition.It is the statistical result in the actually detected signal under the conditions of state no interference signal, major influence factors are statistics
Duration increases statistics duration and is averagely conducive to find suitably after repeatedly measuringValue.
Certainly, as other embodiments, above-mentioned power can also be with power threshold comparison procedure
If the signal of the unmanned plane 3, detected includes WIFI signal, that is, the inspection of the WIFI signal interference unmanned plane detected
It surveys, then changes the operating mode of unmanned plane detection system, the nothing that the bandstop filter of appropriate frequency bands arrives the UHF band reception is set
WIFI signal in man-machine signal is filtered out.
In the present embodiment, the bandstop filter of setting is set according to the relevant parameter of the WIFI signal detected
's.And the detection of the relevant parameter for WIFI signal, commercially available lower-cost WIFI signal detector or nothing can be used
Gauze card；Wherein WIFI signal detector is a kind of WIFI signal detection identification facility of profession, can be examined in a certain range
Survey WIFI signal presence or absence；Meanwhile, it is capable to recognize WIFI signal agreement, the channel of WIFI signal, signal strength and work
The parameter informations such as frequency.Filtering can be selected by the channel and working frequency range of the WIFI signal detector acquisition WIFI signal
Device.
The operating mode of change unmanned plane detection system in above-described embodiment, the WIFI letter including 802.11g/n agreement
Number identification, signal power detection algorithm and WIFI signal restrainable algorithms.
The present invention is by identifying the signal of detection, it is determined whether there are WIFI signal interference, WIFI if it does not exist
Signal interference does not change system operating mode then, carrys out the FPGA resource in saving system, improves system detection efficient；If it exists
The interference of WIFI signal then makes signal by a bandstop filter identical with WIFI frequency band, all letters of frequency range where filtering out
Number, the co-channel interference of WIFI signal is avoided, to reduce the false alarm rate of system, improves the accuracy of detecting.
WIFI signal inhibits Installation practice in unmanned plane test platform:
The present invention also provides WIFI signals in a kind of unmanned plane test platform to inhibit device, in the unmanned plane test platform
WIFI signal inhibits device device to can be controlling terminal equipment；Wherein contain processor and memory, as processor and deposits
Reservoir can use commercial product, which, which is used to execute instruction, realizes WIFI letter in unmanned plane test platform of the invention
Number suppressing method, specific method are shown in the embodiment of the method for above-mentioned introduction, and which is not described herein again.
Claims (6)
1. WIFI signal suppressing method in a kind of unmanned plane test platform, which comprises the following steps:
Signal detection is carried out to unmanned plane, obtains the power of detection signal；
The power that will test signal is compared with power threshold, and whether judged to detect in signal according to comparison result includes WIFI
Signal is filtered detection signal if including.
2. WIFI signal suppressing method in unmanned plane test platform according to claim 1, which is characterized in that detection signal
Process of the power compared with power threshold include:
Wherein, σyFor power threshold, the power threshold is that statistics obtains under state no interference signal；σxFor the signal of real-time detection
Power；K is setting coefficient.
3. WIFI signal suppressing method in unmanned plane test platform according to claim 1, which is characterized in that believe detection
When number being filtered, setting and WIFI signal are filtered with the filter of frequency band.
4. WIFI signal inhibits device in a kind of unmanned plane test platform, which is characterized in that described including processor and memory
Processor is used to execute the instruction of storage in the memory and realizes following method:
Signal detection is carried out to unmanned plane, obtains the power of detection signal；
The power that will test signal is compared with power threshold, and whether judged to detect in signal according to comparison result includes WIFI
Signal is filtered detection signal if including.
5. WIFI signal inhibits device in unmanned plane test platform according to claim 4, which is characterized in that detection signal
Process of the power compared with power threshold include:
Wherein, σyFor power threshold, the power threshold is that statistics obtains under state no interference signal；σxFor the signal of real-time detection
Power；K is setting coefficient.
6. WIFI signal inhibits device in unmanned plane test platform according to claim 4, which is characterized in that believe detection
When number being filtered, setting and WIFI signal are filtered with the filter of frequency band.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110798254A (en) * | 2019-09-27 | 2020-02-14 | 上海特金信息科技有限公司 | WIFI elimination method and device in unmanned aerial vehicle signal detection and electronic equipment |
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| US20110081858A1 (en) * | 2009-10-05 | 2011-04-07 | Jaime Tolentino | Methods and apparatus for enhanced coexistence algorithms in wireless systems |
| CN102238111A (en) * | 2010-04-23 | 2011-11-09 | 中兴通讯股份有限公司 | Signal interference detection method and device |
| CN106443203A (en) * | 2016-11-15 | 2017-02-22 | 中国电子科技集团公司第四十研究所 | Pulse signal detection system and method |
| CN107024682A (en) * | 2017-03-30 | 2017-08-08 | 安徽工程大学 | A kind of object detection method based on adaptive rejecting algorithm |
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Application publication date: 20190423 |