Systems and methods for fast gnss signals acquisition
AssigneeHoneywell Spol, S.R.O.
InventorsRadek Zaruba, Jan Kubalcik, Petr Burian
Life of this patent
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Abstract
Systems and methods for acquiring global navigation satellite system (GNSS) signals. An incoming signal is multiplied with a time shifted spreading code replica and converted to zero (or very low) nominal frequency. The converted signal is filtered and downsampled by a large scale. A signal power metric and frequency offset are then determined. This is performed over multiple slices. Fast acquisition is achieved by parallel concatenation of numerous slices.
Claims10
A global navigation satellite system (GNSS) receiver for acquiring at least one signal broadcasted by a GNSS satellite, said system comprising:
- a first component configured to receive signals, wherein the received signals include at least one broadcasted by a GNSS satellite;
- a second component configured to multiply received signal with local code replica at a plurality of relative time offsets, downconvert the signal using a single local oscillator, filter the downconverted signal and decimate the sample frequency of the filtered signal;
- a third component configured to determine a signal power metric and estimate frequency offset for each of the filtered and downconverted signals;
- and
- a fourth component configured to detect presence of signal broadcasted from GNSS satellite and to acquire the initial estimate of code and frequency offset of the detected signal based on the determined signal power metrics and estimated frequency offsets.
A global navigation satellite system (GNSS) receiving method for acquiring at least one signal broadcasted by a GNSS satellite, said method comprising:
- receiving signals, wherein the received signals include at least one broadcasted by a GNSS satellite;
- multiplying received signal with local code replica at plurality of relative time offsets;
- downconverting of the received signal using single local oscillator;
- filtering the downconverted signal;
- decimating sample frequency of the filtered signal;
- determining a signal power metric and a frequency offset for each of the decimated signals;
- and
- detecting presence of signal broadcasted from a GNSS satellite and acquiring the initial estimate of code and frequency offset of the signal broadcasted based on the determined signal power metrics and estimated frequency offsets.
Dependencies are inferred from the claim text.