Channel and observation domain combination multi-path restraining method in GPS receiver

A GPS receiver, multi-path suppression technology, applied in the field of satellite navigation, can solve the problem of not being suitable for dynamic multi-path transformation scenarios, and achieve the effect of adapting to dynamic changes

Active Publication Date: 2014-02-05
BEIHANG UNIV
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Problems solved by technology

[0005] Aiming at the problem that the existing multipath suppression methods rely on the prior probability distribution assumptions about the multipath parameters to be estimated or are not suitable for dynamic mult

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  • Channel and observation domain combination multi-path restraining method in GPS receiver
  • Channel and observation domain combination multi-path restraining method in GPS receiver
  • Channel and observation domain combination multi-path restraining method in GPS receiver

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Embodiment

[0027] Utilize the combined multipath suppression method of the receiver channel and the observation domain provided by the present invention, taking the suppression of the multipath error caused by one multipath signal component in a GPS C / A code receiver as an example, the concrete realization of the method of the present invention is illustrated step.

[0028] Assuming that the GPS receiver receives the direct path signal of GPS No. 22 satellite, assuming that the navigation data has been demodulated and the influence of noise is ignored, the input signal of the corresponding receiver channel at time t can be expressed as: s(t)=Ac( t–τ)cos[ω(t–τ)], where A is the amplitude of the received signal, c(t) is the spreading code (i.e. C / A code), ω is the angular frequency of the received signal, and τ is the Delay to receiver distance. Superimpose a multipath signal component on the above signal: its amplitude is 0.5 times that of the direct path signal, expressed as α m A; its...

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Abstract

The invention provides a channel and observation domain combination multi-path restraining method in a GPS receiver, and belongs to the technical field of satellite navigation. The channel and observation domain combination multi-path restraining method includes the steps of firstly, expanding channel correlator branches of a standard receiver, improving the delay resolution ratio, extending a delay coverage range, then using a multi-path channel to output the characteristics causing distortion of a correlation function, building a multi-path balancer in a receiver channel, estimating multi-path signal components, compensating a multi-path tracking error, and finally using the wavelet-threshold-based filtering algorithm to build a multi-path filter for the receiver observed quantity to restrain the multi-path error in the pseudo-range and carrier phase observed quantity. The channel and observation domain combination multi-path restraining method does not depend on the assumption related to multi-path parameter prior probability distribution to be estimated and can be well suitable for dynamic changes of the multi-path environment, and the multi-path errors in GPS receiver codes, a carrier wave tracking loop and the pseudo-range and carrier phase observed quantity are eliminated through the multi-path processing comprehensive method.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to a multipath effect suppression method in a global positioning system (GPS) signal receiver. Background technique [0002] In applications where multipath exists, a GPS receiver will receive additional copies of the navigation satellite signal caused by reflectors in the environment. Since GPS receivers generally use positioning methods based on satellite signal time of arrival (TOA) measurements, and assume that the received satellite signals propagate along a line-of-sight path (a straight-line path from the satellite to the receiver antenna segment), multipath signals will The code delay-locked loop (DLL) of the receiver introduces additional estimated delay deviation, and affects the carrier phase-locked loop (PLL) of the receiver under the coupling effect, causing code and carrier tracking errors, thus causing pseudo-range and carrier phase observatio...

Claims

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Application Information

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IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/22G01S19/29G01S19/30
Inventor 赵昀寇艳红薛晓男张婷菲高米
Owner BEIHANG UNIV
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