8 results about "Software receiver" patented technology

The invention relates to the technical field of GNSS deception jamming detection, in particular to a GNSS deception jamming detection method and system based on a random forest, a GNSS software receiver is adopted to process deception data sets of different scenes, parameters of different processing stages are extracted to serve as sample features, sample tags are added according to the deception occurrence moments of the scenes, and the deception jamming detection method and system based on the random forest are obtained. The parameter characteristics of different processing stages comprise signal processing stage characteristics, original observed quantity characteristics and PVT calculation result characteristics; gNSS deception jamming detection is used as a dichotomy problem of signals not subjected to deception jamming and signals mixed with deception jamming, a random forest classifier is constructed by utilizing extracted sample training, and whether the deception jamming signals exist in GNSS signals to be detected or not is judged by utilizing the classifier. According to the method, the GNSS deception jamming is detected by selecting the parameters of different processing stages as the features and constructing the random forest classifier, the importance of each feature in deception detection is deeply analyzed, and a reference is provided for deeply understanding deception behaviors and reasonably formulating an anti-deception strategy.

The invention provides a GNSS deception jamming detection method, device and equipment and a storage medium, and the method comprises the steps: inputting a to-be-detected GNSS signal into a GNSS software receiver, so as to obtain the lead output, the real-time output and the lag output of a correlator in the GNSS software receiver, carrying out the calculation to obtain a feature sequence, and carrying out the calculation of the feature sequence; and inputting the feature sequence into a preset converter model for processing to obtain an analysis result of the to-be-detected GNSS signal. Compared with a traditional detection method and a detection method based on an SVM model, the method has the advantages that the overall detection performance is improved, meanwhile, the low false alarm rate and the high generalization ability are kept, and the effectiveness and robustness in diversified deception jamming scenes are improved.

The present invention provides a GNSS spoofing interference detection method, apparatus, device, and storage medium. The method comprises: inputting a GNSS signal to be detected into a GNSS software receiver to obtain an advanced output, an immediate output, and a delayed output of a correlator in the GNSS software receiver; calculating a characteristic sequence; and inputting the characteristic sequence into a preset converter model for processing to obtain an analysis result of the GNSS signal to be detected. The present invention has the following beneficial effects: Compared with traditional inspection methods and SVM-based model detection methods, it improves overall detection performance while maintaining a low false alarm rate and high generalization capability, and improves effectiveness and robustness in diverse spoofing interference scenarios.

The present application provides a software receiver for GNSS carrier phase differential positioning, comprising: a signal receiving module, configured to receive satellite signals and generate digital signals after analog-to-digital conversion; a signal processing module, configured to perform acquisition, pre-bit synchronization before tracking, and tracking on the digital signals to obtain signal synchronization parameters and signal tracking results of the satellite signals, the signal synchronization parameters including carrier phase, pseudo-code phase, and Doppler frequency; an information processing module, configured to demodulate the message in the signal tracking results and extract the message time information; an observable extraction module, configured to calculate the original observables of the satellite signals according to the signal synchronization parameters and the message time information, and calculate the estimated observables corresponding to the local extraction time of the corresponding software receiver according to the original observables, the estimated observables including pseudo-range, Doppler frequency, and integrated Doppler; and a positioning and solution module, configured to perform carrier phase differential positioning and solution according to the pseudo-range, Doppler frequency, and integrated Doppler of the estimated observables.

The application discloses a GNSS induced spoofing detection method based on RMS sliding envelope and SVM, first, using a software receiver to capture and track visible satellites from GNSS intermediate frequency signals, taking IQ data, carrier-to-noise ratio C / N0 and Doppler frequency shift of an ELP tracking loop as original features; then setting a window length and calculating extreme points of the original features, and then using a cubic spline interpolation method to interpolate the maximum and minimum points to obtain upper and lower envelope curves of the original features; calculating a sliding root mean square of the envelope curves as new features after processing; after normalizing the new features, using principal component analysis for feature dimension reduction; finally, dividing the features into a training set and a test set, inputting test samples after training a support vector machine to obtain the final classification result. The application reduces data redundancy and operation time, is easy to implement and has low complexity, has low requirements on a receiver, greatly reduces equipment cost of the receiver, and has a wider application scenario.

The present invention discloses a multi-phase parallel rapid acquisition system and method for use in a navigation system. The system comprises a peripheral circuit and an internal logic circuit. The peripheral circuit includes a general control processor and an analog-to-digital conversion module. The internal logic circuit includes an interface module for read-write access control with the general control processor, a system configuration module for implementing system configuration, a channel parameter storage module for storing satellite acquisition parameters, a control module for scheduling various modules, a data preprocessing module for implementing intermediate frequency carrier stripping, downsampling, and requantization, a data storage module for storing data required for acquisition, an internal code generator for generating internal codes, a code storage module for storing codes required for acquisition, and a multi-phase parallel detection module for implementing parallel detection of 32 phases. The present invention can improve acquisition efficiency and, compared with existing software receivers, can reduce overhead and save resources.

The present application belongs to the field of anti-interference technology of satellite navigation system, and discloses a BDS-3 observation data quality evaluation method and system under aviation VHF interference. The present application carries out spectrum analysis on aviation VHF navigation signal, determines potential harmonic interference falling into the frequency band of BDS-3 according to the passband margin, and constructs a parameterized interference model; establishes an interference transmission-propagation-reception link budget model, calculates the interference power and the interference-to-noise ratio; builds a semi-physical simulation platform, injects real BDS-3 signals and simulated interference, obtains observation data under interference and without interference through parallel test of commercial and software receivers, compares and analyzes the observation data under interference and without interference, and quantitatively evaluates the influence of interference on the key performance parameters of BDS-3 receiver. The present application realizes accurate quantification of the quality of BDS-3 observation data under aviation VHF interference, and provides technical support for the navigation safety of BDS-3 in aviation VHF interference environment.

This invention discloses a signal analysis method and system for a real-time software receiver of the new GLONASS system signal, solving the technical problem that the signal analysis process of existing civilian GLONASS software receivers is difficult to meet the real-time requirements of software receivers in practical applications. The method includes acquiring the new GLONASS system signal and the local PRN code; preprocessing with a Doppler frequency table and a predefined number of sampling points to generate multiple sets of intermediate frequency signals; combining the local PRN code and the coherent integration duration acquisition signal to output the captured Doppler precision estimate; generating a baseband low-frequency signal and six sets of correlation results based on the resampled code library and other tracking signals; outputting code phase observations and five-domain signal quality indicators through signal analysis; outputting a valid navigation message through synchronous decoding such as CRC check; and finally, combining the message, indicators, etc., completing the positioning calculation based on the receiver's initial position approximation to output the receiver's final three-dimensional position.