2 results about "Software receiver" patented technology

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.