A method, receiver and system for eliminating Doppler frequency offset

Abstract

The invention discloses a method, a receiver and a system for eliminating a Doppler frequency offset and belongs to the technical field of communication. The method comprises the following steps of: receiving a GPS (Global Position System) signal, wherein the GPS signal contains a first Doppler frequency offset caused by rotation of a rotary carrier; acquiring rotation parameters of the rotary carrier; carrying out counting according to the rotation parameters to obtain a second Doppler frequency offset; constructing a local carrier signal containing the second Doppler frequency offset; and carrying out frequency mixing and filtering on the local carrier signal and the GPS signal, and eliminating the first Doppler frequency offset contained in the GPS signal. According to the method, the receiver and the system for eliminating the Doppler frequency offset, the Doppler frequency offset caused by the rotation in the frequency mixing and filtering processes is eliminated by acquiring the rotation parameters of the rotary carrier and adding the Doppler frequency offset caused by the rotation into a local carrier, and the accurate tracking on the GPS signal is realized under the condition that a track loop is not changed.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method, receiver and system for eliminating Doppler frequency offset. Background technique [0002] In recent years, with the continuous improvement of people's material living standards, more and more people have a strong dependence on the location information of themselves and surrounding things. The popularization of satellite positioning technology enables people to obtain the required location information more conveniently, timely and accurately. According to statistics, more than 80% of the information used by people is related to "location". However, although the GPS positioning technology in ordinary environments is relatively mature now, as people demand more and more location information, it is also necessary to locate objects in special environments such as in a relative motion state, so that this The precise location of such objects is provided to groups in...

AI Technical Summary

Problems solved by technology

[0005] When the carrier to be positioned is in a state of rotation (100-300 revolutions / second), the rotation state will bring about an ultra-high Doppler change rate, for example, for a carrier with a diameter of 10 cm rotating at 200 revolutions / second, 1 millisecond The internal Doppler change can reach nearly 300Hz, which will bring a large Doppler frequency deviation. If you track the GPS signal of the rotating carrier, you need to add a higher-order tracking loop to the receiver, and the higher-order tracking loop is stable. Poor performance, it is easy to cause the loop to lose lock, resulting in inaccurate tracking

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