CN112578407B - Low-complexity satellite navigation anti-deception method - Google Patents
Low-complexity satellite navigation anti-deception method Download PDFInfo
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- CN112578407B CN112578407B CN202011335623.6A CN202011335623A CN112578407B CN 112578407 B CN112578407 B CN 112578407B CN 202011335623 A CN202011335623 A CN 202011335623A CN 112578407 B CN112578407 B CN 112578407B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000001629 suppression Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012850 discrimination method Methods 0.000 description 1
Classifications
-
- 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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/015—Arrangements for jamming, spoofing or other methods of denial of service of such systems
Abstract
The invention provides a low-complexity satellite navigation anti-deception method, which comprises the steps of obtaining sampling data of N paths of input signals of an array signal, estimating the phase of a deception signal array guide vector, estimating the amplitude of the deception signal array guide vector, constructing the deception signal array guide vector, calculating orthogonal projection of a deception signal subspace, calculating an array signal output weighting value, and obtaining final anti-deception output by weighting the input signals. The invention is not easy to be influenced by the change of the deception signal, is easier to complete the countermeasure suppression of the deception signal, does not need any antenna array calibration process for the estimation of the array steering vector of the deception signal, and is easy to realize engineering.
Description
Technical Field
The invention relates to the field of satellite navigation anti-deception, in particular to a satellite navigation anti-deception method.
Background
Spoofing is an important means of navigation countermeasure with the aim of spoofing or disrupting the counterpart navigation system. Compared with the traditional suppression interference, the deception interference has weak power, is not easy to be perceived and has larger threat, so the research on the satellite navigation deception technology is significant.
The existing satellite navigation anti-deception method needs to perform two-dimensional search of a pseudo code initial phase and Doppler frequency, obtains the position of a satellite signal pseudo code correlation peak, and performs judgment and suppression of deception signals according to the front and rear positions of the pseudo code correlation peak. However, the actual deception jamming signals can enable the relative positions of the pseudo code correlation peaks of the deception signals and the real signals to be changed randomly by accurately simulating the information of each satellite; meanwhile, the strength of the deception signal can be adjusted at will, and the real signal can be submerged under the deception signal, so that the real signal cannot be observed. Therefore, the existing correlation peak discriminating method is not applicable.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a low-complexity satellite navigation anti-deception method. One premise that the invention needs to assume is that the deception signals come from the same incidence direction, and the deception interference signals are restrained by utilizing the characteristic of the spatial coherence of the array signals.
The technical scheme adopted by the invention for solving the technical problems comprises the following detailed steps:
step 1: acquiring sampling data r of N paths of input signals of array signals i (nT s ),i＝1,2,...,N，T s For a sampling time interval, n=0, 1..k-1, K is the number of samples, N is the number of array elements, N is not less than 2;
step 2: estimating the phase θ of the steering vector of the rogue signal array i ：
Wherein () * The symbol represents conjugate, the symbol represents phase angle (radian), and the symbol T is time interval and is a pseudo code period;
step 3: estimating the amplitude beta of a spoof signal array steering vector i ：
Wherein,representing an evolution operation;
step 4: constructing a spoofing signal array steering vector y:
step 5: computing an orthogonal projection of the spoofed signal subspace:
P ⊥ ＝I N -y(y H y) -1 y H
wherein () H Represents conjugate transpose, I N Representing an N-dimensional array of units () -1 Representing matrix inversion;
step 6: calculating an array signal output weighting value omega:
ω＝P ⊥ h
wherein h is an arbitrary unit vector of dimension N1;
step 7: weighting the input signal to obtain an anti-spoofing final output Z n ：
Wherein omega i Is the i-th row element of the column vector W.
The invention has the beneficial effects that:
1. compared with a discrimination method based on correlation peaks, the method is not easy to influence discrimination due to the change of the deception signals, and the deception signal countermeasures are easier to suppress.
2. The estimation of the array steering vector for the spoofing signal does not require any antenna array calibration procedure, and is easy to engineer.
Detailed Description
The invention is further illustrated below with reference to examples.
Step 1: acquisition of sample data r of 4-way input signal of array signal i (nT s ) I=1, 2,..4, sampling interval T s For 16ns, n=0, 1..k-1, K is the number of samples 124000;
step 2: estimating the phase θ of the steering vector of the rogue signal array i 。
Wherein () * Represents conjugate, the angle represents the phase angle (radian), and T is 1ms;
step 3: estimating spoofed signalsAmplitude beta of array steering vector i ：
Wherein,representing the evolution operation.
Step 4: constructing a spoof signal array steering vector y
Step 5: computing orthogonal projections of spoofed signal subspaces
P ⊥ ＝I N -y(y H y) -1 y H
Wherein () H Represents conjugate transpose, I N Representing an N-dimensional array of units () -1 Representing the matrix inversion. Step 6: calculating the output weighted value w of the array signal
w＝P ⊥ h
Wherein h is a 4*1-dimensional unit vector [0.5;0.5;0.5;0.5].
Step 7: weighting the input signal to obtain an anti-spoofing final output Z n ：
Wherein omega i Is the i-th row element of the column vector W.
Thus, the design of the low-complexity satellite navigation anti-deception method is completed.
Claims (1)
1. A low complexity anti-spoofing method for satellite navigation, comprising the steps of:
step 1: acquiring sampling data r of N paths of input signals of array signals i (nT s ),i＝1,2,...,N，T s For a sampling time interval, n=0, 1..k-1, K is the number of samples, N is the number of array elements, N is not less than 2;
step 2: estimating the phase θ of the steering vector of the rogue signal array i ：
Wherein () * The symbol represents conjugate, the symbol represents phase angle, the unit is radian, T is time interval, and a pseudo code period;
step 3: estimating the amplitude beta of a spoof signal array steering vector i ：
Wherein,representing an evolution operation;
step 4: constructing a spoofing signal array steering vector y:
step 5: computing an orthogonal projection of the spoofed signal subspace:
P ⊥ ＝I N -y(y H y) -1 y H
wherein () H Represents conjugate transpose, I N Representing an N-dimensional array of units () -1 Representing matrix inversion;
step 6: calculating an array signal output weighting value omega:
ω＝P ⊥ h
wherein h is an arbitrary unit vector of dimension N1;
step 7: the input signal is weighted and the signal is weighted,obtaining the final output Z of anti-spoofing n ：
Wherein omega i Is the i-th row element of the column vector W.
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| CN112578407B true CN112578407B (en) | 2023-11-10 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941267A (en) * | 2014-03-17 | 2014-07-23 | 中国民航大学 | Satellite navigation deception interference suppression method combined with denoising and DOA estimation |
| CN104459713A (en) * | 2014-12-10 | 2015-03-25 | 西安建筑科技大学 | Method used for estimating direction of arrival of deception jamming through satellite navigation receiver |
| KR101677136B1 (en) * | 2015-05-27 | 2016-11-17 | 국방과학연구소 | System and Method for Global Navigation Satellite System Spoofing Detection using a Single Authentic Signal |
| KR20190048596A (en) * | 2017-10-31 | 2019-05-09 | 국방과학연구소 | Gnss receiver for anti-spoofing and method for detecting gnss spoofing attack |
| CN110146900A (en) * | 2019-05-24 | 2019-08-20 | 清华大学 | A kind of satellite navigation low complex degree traversal formula RAIM anti-fraud method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140247186A1 (en) * | 2012-10-26 | 2014-09-04 | Uti Limited Partnership | Global Navigation Satellite System (GNSS) Anti-Interference using Array Processing |
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2020
- 2020-11-24 CN CN202011335623.6A patent/CN112578407B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| CN103941267A (en) * | 2014-03-17 | 2014-07-23 | 中国民航大学 | Satellite navigation deception interference suppression method combined with denoising and DOA estimation |
| CN104459713A (en) * | 2014-12-10 | 2015-03-25 | 西安建筑科技大学 | Method used for estimating direction of arrival of deception jamming through satellite navigation receiver |
| KR101677136B1 (en) * | 2015-05-27 | 2016-11-17 | 국방과학연구소 | System and Method for Global Navigation Satellite System Spoofing Detection using a Single Authentic Signal |
| KR20190048596A (en) * | 2017-10-31 | 2019-05-09 | 국방과학연구소 | Gnss receiver for anti-spoofing and method for detecting gnss spoofing attack |
| CN110146900A (en) * | 2019-05-24 | 2019-08-20 | 清华大学 | A kind of satellite navigation low complex degree traversal formula RAIM anti-fraud method and device |
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| A low-complexity spoofing detection and suppression approach for ADS-B;Wenyi Wang 等;《2015 Integrated Communication, Navigation and Surveillance Conference (ICNS)》;第1-8页 * |
| GPS接收机空时抗干扰理论与实现关键技术研究;郭艺;《中国博士学位论文全文数据库》;第71-91页 * |
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