Anti-repeater deception jamming method and detection system based on FPGA
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A deceptive jamming and forwarding technology, applied in the field of satellite signal detection, can solve problems such as receiver positioning errors, and achieve the effect of ensuring positioning accuracy
Pending Publication Date: 2018-05-08
BEIJING SATELLITE INFORMATION ENG RES INST
View PDF5 Cites 11 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0004] The purpose of the subject to be solved by the invention is to overcome the problem of wrong positioning of the receiver under the situation of forwarding deception interference, and provide a FPGA-based anti-transmission deception interference method, which is to detect satellite signals in the acquisition phase, and Capture normal satellite signals in the presence of repeating deceptive interference signals, so as to achieve the purpose of anti-repeating deception interference
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0032] Embodiment 1, an FPGA-based anti-transfer deception interference method, such as figure 1 As shown, it specifically includes the following steps:
[0033] Step 1, obtain the Beidou or GPS satellite signal in the acquisition stage of satellite navigation, carry out PMF (matched filtering) and DFT (discrete Fourier transform) processing to the obtained satellite signal;
[0034] Step 2, performing peak detection on satellite signals to obtain the relevant peak values of all satellite signals;
[0035] Step 3, set the threshold V1 to 6000, filter the correlation peaks of all satellite signals obtained in step 2 one by one, and remove the correlation peaks of the satellite signals less than or equal to the threshold V1; (the setting of the threshold V1 is an empirical value, we pass the signal Source to grab the relevant value when the capture is completed, after statistics and then calculate its average value)
[0036] Step 4, among the correlation peaks of the satelli...
Embodiment 2
[0040] Embodiment two: (1) peak detection module design; normal satellite signal can only capture a maximum correlation peak in the acquisition stage, and if there is the transponder interference signal, there will be two similar correlation peaks, and this situation is just very Spoofed jamming signals may be picked up. Since the repeating spoofing interference is generated by the delay amplification of the normal satellite signal, the signal corresponding to the smaller code phase among the two captured correlation peaks is the normal satellite signal.
[0041] (2) Peak filtering module design; due to the existence of noise, many small correlation peaks will be generated. After peak detection, if the peak comparison is directly performed, the capture speed will be affected, so a threshold V1 can be set. If the correlation result in the capture phase is greater than the set threshold V1, start the peak comparison; if the correlation value is less than the set threshold V1, di...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
An anti-repeater deception jamming method and detection system based on FPGA are provided. Through an FPGA design scheme, normal satellite signals are locked in a capture stage. The peak values of thesignals are detected, and all correlation peaks are found; a threshold V1 is set, the found correlation peaks are filtered, and small peaks caused by noise are eliminated; the largest and second largest peak values and the corresponding code phases and Doppler frequencies are found; a threshold V2 is set to make judgment; if the second largest peak value is smaller than the threshold V2, it is judged that there are only normal satellite signals, and the code phase and Doppler frequency corresponding to the largest peak value are locked; and if the second largest peak value is larger than thethreshold V2, it is judged that there is repeater deception jamming, and the smaller code phase and the corresponding Doppler frequency are locked. According to the invention, satellite signals are detected in the capture stage, normal satellite signals are captured if there are repeater deception jamming signals, and therefore, the purpose of anti-repeater deception jamming is achieved.
Description
technical field [0001] The invention belongs to the field of satellite signal detection, in particular to an FPGA-based anti-transfer deception interference method and a detection system thereof. Background technique [0002] With the development of electronic technology and navigation technology, the security of satellite navigation system has gradually become a concern of military and civilian users, especially the research on spoofing and anti-spoofing technology for current satellite navigation signals has become a hot spot. However, since the signal strength is very weak when it reaches the satellite navigation system receiver, it is extremely easy to be suppressed by a stronger co-channel jamming signal (or spoofing), which is usually sent by a transponder close to the receiver antenna. Unlike ordinary suppressive jamming, spoofing attacks are more threatening because the target receiver is simply unaware of the threat. The purpose of common jamming is to simply block...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more