CN107202996A - Satellite navigation anti-deceptive interference design based on multiple spot correlation method - Google Patents
Satellite navigation anti-deceptive interference design based on multiple spot correlation method Download PDFInfo
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- CN107202996A CN107202996A CN201710400276.2A CN201710400276A CN107202996A CN 107202996 A CN107202996 A CN 107202996A CN 201710400276 A CN201710400276 A CN 201710400276A CN 107202996 A CN107202996 A CN 107202996A
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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
- 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
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
- G01S19/215—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service issues related to spoofing
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention discloses a kind of satellite navigation anti-deceptive interference design based on multiple spot correlation method, the tracking of multi-point signal is carried out using the code tracking loop in signal trace loop, code stripping bench in signal trace loop, sliding correlation detector compared with the advanced N number of chip of normal signal is set, judge whether the signal in current tracking channel is curve by judging the energy peak of the sliding correlation detector, if curve, then the signal is rejected, and recover the locking tracking of actual signal.The inventive method is applied in satellite navigation and location system, the detection of quick cheating interference signal can be achieved, judges and rejects, this method design complexities are low, take hardware resource few, improve logic reliability, the satellite navigation and location system of kinds of platform is can be widely applied to, quick high performance anti-deceptive interference function is realized.
Description
Technical field
The invention belongs to the technical field of satellite navigation using GPS or Big Dipper GPS system, especially relate to
And a kind of satellite navigation anti-deceptive interference design based on multiple spot correlation method.
Background technology
The design method of anti-deceptive interference in existing satellite navigation product be generally by signal capture mirror method for distinguishing,
Recognize to judge whether signal is Deceiving interference signal in the multiple capture of signal capture device by the signal to receiving, from
And realize the discriminating and rejecting of signal.
Used in the planar search method that the signal capture device of current main flow is combined using matched filter and FFT, this method
The dependence to hardware resource of matched filter and FFT logic it is larger, realize anti-takes advantage of while high performance signal capture is realized
Interference is deceived, the complexity of code will be substantially increased, and then make it that the reliability and robustness of logic are all weaker, and will be consumed more
Logical resource.
The content of the invention
The purpose of the present invention is that provides a kind of satellite navigation based on multiple spot correlation method to solve the above problems
Anti-deceptive interference is designed.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of satellite navigation anti-deceptive interference design based on multiple spot correlation method, using the code tracking in signal trace loop
Ring carries out the tracking of multi-point signal, and the code stripping bench in signal trace loop is set compared with the advanced N number of chip of normal signal
Sliding correlation detector, judges whether the signal in current tracking channel is deception by judging the energy peak of the sliding correlation detector
Signal, if curve, then rejects the signal, and recover the locking tracking of actual signal.
Further, by setting the sliding correlation detector compared with the advanced N number of chip of normal signal, the relevant peaks of N points can be achieved
Detection, and then multi-point signal detection can be realized and judged.
The detailed process of satellite navigation anti-deceptive interference is as follows：
S1：The tracking of multi-point signal is carried out using the code tracking loop in signal trace loop；
S2：Code stripping bench in signal trace loop, sets related compared with the slip of the advanced N number of chip of normal signal
Device；
S3：Correlation intergal is carried out to sliding correlation detector；
S4：Relevant peaks to sliding correlation detector carry out Threshold detection；
S5：Judge whether the energy peak of the relevant peaks of sliding correlation detector exceedes detection threshold, if being not above detection
Thresholding, then perform step S6, if it exceeds detection threshold, then perform step S7；
S6：Judge whether the advanced number N of sliding correlation detector exceedes locking signal chip maximum number value, if it does, then
Jump to step S1 to reset sliding correlation detector, if be not above, redirected after the advanced number N of adjustment sliding correlation detector
To step S4；
S7：Calculate the relevant peaks of sliding correlation detector and the difference of Current lock signal number of chips；
S4：Passage number of chips is set in advance；
S5：Recover actual signal, locking flow terminates.
The beneficial effects of the present invention are：
The inventive method is applied in satellite navigation and location system, and the detection of quick cheating interference signal can be achieved, sentences
Disconnected and rejecting, this method design complexities are low, and occupancy hardware resource is few, improves logic reliability, can be widely applied to a variety of
The satellite navigation and location system of platform, realizes quick high performance anti-deceptive interference function.
Brief description of the drawings
Fig. 1 is the flow chart of satellite navigation anti-deceptive interference design of the present invention；
Fig. 2 is the time difference schematic diagram of actual signal and curve.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings：
The present invention carries out the tracking of multi-point signal using the code tracking loop in signal trace loop, in signal trace loop
Code stripping bench, the sliding correlation detector compared with the advanced N number of chip of normal signal is set, by the energy for judging the sliding correlation detector
Peak value judges whether the signal in current tracking channel is curve, if curve, then rejects the signal, and
Recover the locking tracking of actual signal.
By setting the sliding correlation detector compared with the advanced N number of chip of normal signal, the related blob detection of N points can be achieved, and then
Multi-point signal detection can be achieved and judges.
As shown in figure 1, the detailed process of satellite navigation anti-deceptive interference is as follows：
S1：The tracking of multi-point signal is carried out using the code tracking loop in signal trace loop；
S2：Code stripping bench in signal trace loop, sets related compared with the slip of the advanced N number of chip of normal signal
Device；
S3：Correlation intergal is carried out to sliding correlation detector；
S4：Relevant peaks to sliding correlation detector carry out Threshold detection；
S5：Judge whether the energy peak of the relevant peaks of sliding correlation detector exceedes detection threshold, if being not above detection
Thresholding, then perform step S6, if it exceeds detection threshold, then judge that code-phase is closed and complete, step S7 is performed, into loop tracks shape
State；
S6：Judge whether the advanced number N of sliding correlation detector exceedes locking signal chip maximum number value, if it does, then
Jump to step S1 to reset sliding correlation detector, if be not above, redirected after the advanced number N of adjustment sliding correlation detector
To step S4；
S7：Calculate the relevant peaks of sliding correlation detector and the difference of Current lock signal number of chips；
S4：Passage number of chips is set in advance；
S5：Recover actual signal, locking flow terminates.
In the design, secondary judgement is carried out to actual signal that may be present by sliding correlation detector, judgment basis is true
Real signal number of chips is ahead of the curve of Current lock, to judge whether Current lock signal is curve, if
Judge successfully, i.e., by the advanced corresponding number of chips of Current lock number of chips, you can recover the locking tracking of actual signal.
Due to curve compared with normal signal lag time not necessarily, therefore signal is being carried out by the related method of multiple spot
During detection, detection time section need to be cut, to realize signal detection and the judgement of wider time range.Fig. 2 is true letter
Time difference schematic diagram number with curve, curve lags behind actual signal N*t durations, and wherein t is half chip duration, N
For delayed half number of chips, for ease of the detection and correction to signal, this period is cut (figure by half chip duration by between
Middle dotted portion), every half chip is detected, and carries out the proposition of curve by half advanced number of chips of adjustment.
These are only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Any modifications, equivalent substitutions and improvements made within principle etc., should be included within the scope of the present invention.
Claims (3)
1. a kind of satellite navigation anti-deceptive interference design based on multiple spot correlation method, it is characterised in that：Using signal trace loop
In code tracking loop carry out the tracking of multi-point signal, the code stripping bench in signal trace loop sets super compared with normal signal
The sliding correlation detector of top n chip, the letter in current tracking channel is judged by judging the energy peak of the sliding correlation detector
Number whether it is curve, if curve, then rejects the signal, and recover the locking tracking of actual signal.
2. the satellite navigation anti-deceptive interference design according to claim 1 based on multiple spot correlation method, it is characterised in that：It is logical
The sliding correlation detector set compared with the advanced N number of chip of normal signal is crossed, the related blob detection of N points can be achieved, and then multiple spot can be realized
Signal detection and judgement.
3. the satellite navigation anti-deceptive interference design according to claim 1 based on multiple spot correlation method, it is characterised in that defend
The detailed process of star navigation anti-deceptive interference is as follows：
S1：The tracking of multi-point signal is carried out using the code tracking loop in signal trace loop；
S2：Code stripping bench in signal trace loop, sets the sliding correlation detector compared with the advanced N number of chip of normal signal；
S3：Correlation intergal is carried out to sliding correlation detector；
S4：Relevant peaks to sliding correlation detector carry out Threshold detection；
S5：Judge whether the energy peak of the relevant peaks of sliding correlation detector exceedes detection threshold, if being not above detection threshold,
Step S6 is then performed, if it exceeds detection threshold, then perform step S7；
S6：Judge whether the advanced number N of sliding correlation detector exceedes locking signal chip maximum number value, if it does, then redirecting
Sliding correlation detector is reset to step S1, if be not above, step is jumped to after the advanced number N of adjustment sliding correlation detector
Rapid S4；
S7：Calculate the relevant peaks of sliding correlation detector and the difference of Current lock signal number of chips；
S4：Passage number of chips is set in advance；
S5：Recover actual signal, locking flow terminates.
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| CN108919311A (en) * | 2018-04-18 | 2018-11-30 | 青岛杰瑞自动化有限公司 | Anti-interference method for Beidou Navigation System |
| CN110231633A (en) * | 2019-05-15 | 2019-09-13 | 西安交通大学 | A kind of GNSS Deceiving interference identification, suppressing method and system of the signal acquisition phase based on LSTM |
| CN111913195A (en) * | 2020-07-07 | 2020-11-10 | 北京自动化控制设备研究所 | GPS receiver anti-deception jamming processing method based on land-based radio navigation information |
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| CN110231633A (en) * | 2019-05-15 | 2019-09-13 | 西安交通大学 | A kind of GNSS Deceiving interference identification, suppressing method and system of the signal acquisition phase based on LSTM |
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