Method of reducing inter-channel biases in glonass gnss receivers
AssigneeTopcon Positioning Systems, Inc.
InventorsVLADIMIR VICTOROVICH VEITSEL, ANDREY VLADIMIROVICH VEITSEL, KONSTANTIN VLADIMIROVICH CHERESHNEV
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Abstract
The present invention discloses methods of accuracy improving for code measurements in GLONASS GNSS receivers. One component of error budget in code measurements of GLONASS receivers is caused by a difference in signal delays arising in the receiver analog Front End and antenna filter on different channel frequencies specific to GLONASS satellites. Methods to compensate for differences in delays for different GLONASS channel frequencies have been proposed using data collected from a GLONASS signals simulator.
Claims13
A method of reducing inter-channel bias in a GLONASS receiver, the method comprising:
- generating primary code measurements in the GLONASS receiver that includes an analog Front-end and a DLL,
- wherein the DLL includes a code sequence generator, a strobe generator, a correlator, a discriminator, and a loop filter, connected in a feedback loop,
- wherein the strobe generator generates a strobe sequence, formed of strobes, for every PRN code chip, with a position of each strobe fixed to a boundary of each PRN code chip, and a sign of each strobe corresponds to a sign of a next PRN code chip;
- calculating the primary code measurements;
- and
- calculating current coordinates based on the primary code measurements.
A GLONASS receiver with reduced inter-channel bias, comprising:
- an antenna receiving signals from GLONASS satellites;
- an analog Front-End receiving and processing the signals from the antenna, the analog Front-End including a filter receiving the signals from the antenna and providing the filtered signals to a digital processing module that includes a DLL;
- wherein the DLL includes a code sequence generator, a strobe generator, a correlator, a discriminator, and a loop filter, connected in a feedback loop;
- the strobe generator generating a strobe sequence, formed of strobes, for every PRN code chip, with a position of each strobe fixed to a boundary of each PRN code chip, and a sign of each strobe corresponds to a sign of a next PRN code chip;
- and
- the digital processing module outputting the primary code measurements and calculating current coordinates based on the primary code measurements.
Dependencies are inferred from the claim text.