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Improved carrier wave tracking ring based on extended Kalman filtering

A technology for extending Kalman and carrier tracking loops, which can be used in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc., and can solve problems such as inapplicability

Active Publication Date: 2016-05-25
北京轩宇信息技术有限公司
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  • Abstract
  • Description
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Problems solved by technology

Not suitable for tracking loops with modulation information at high dynamics

Method used

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  • Improved carrier wave tracking ring based on extended Kalman filtering
  • Improved carrier wave tracking ring based on extended Kalman filtering
  • Improved carrier wave tracking ring based on extended Kalman filtering

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Embodiment

[0080] The initial phase and frequency generated by the local NCO5 in the current T time period (assumed to be the kth T time period) are θ 2 and f nco The cos value and the sin value of the local carrier wave are output to the first phase rotation module 111 and the second phase rotation module 151, and the first phase rotation module 111 uses the in-phase branch signal I and the output of the local carrier and the receiver front-end down-conversion module The quadrature branch signal Q generates the signal Icos-Qsin, and the second phase rotation module 151 uses the local carrier and the in-phase branch signal I and the quadrature branch signal Q output by the receiver front-end down-conversion module to generate the signal Qcos+Isin, and then The signal Icos-Qsin is processed by the integration-clearing process of T duration through the first integral clearing module 112 to obtain the same-phase branch tracking signal I k, output to the first multiplier 13 and the sign dec...

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Abstract

The invention relates to an improved carrier wave tracking ring based on extended Kalman filtering. The improved carrier wave tracking ring comprises a baseband signal preprocessing module, a matrix calculation module, an extended Kalman filtering module and a local NCO. At every time interval T, pre-processing on a signal I and a signal Q is carried out by the baseband signal preprocessing module to acquire observed values, a linearization matrix H is calculated through the matrix calculation module, estimation values of the phase and the frequency are acquired through calculation by utilizing the extended Kalman filtering module, the local NCO is enabled to generate a local carrier wave signal which is outputted to the baseband signal preprocessing module, and thereby carrier wave tracking at the every time interval T is realized. Through the improved carrier wave tracking ring, a phase discriminator is not required, the improved carrier wave tracking ring is suitable for tracking demands during information modulation in the low-signal-to-noise-ratio and high-dynamic situation, hardware realization is simple, the operation rate of the whole carrier wave tracking ring can be effectively improved, and resource consumption is reduced.

Description

technical field [0001] The invention relates to a carrier tracking loop based on extended Kalman filtering, which belongs to the field of carrier tracking of communication receivers. Background technique [0002] In a high dynamic application environment, there are drastic nonlinear changes in the relative motion trajectory between the receiver carrier and the satellite, and there are large velocities, accelerations, and jerks, which cause the signals received by the communication receiver to contain large The Doppler frequency shift and its higher order derivatives make the tracking loop very vulnerable to loss of lock. Generally, in order to adapt to the Doppler dynamics of the large input signal, the carrier tracking loop needs to increase the loop bandwidth, but in the case of low signal-to-noise ratio, increasing the loop bandwidth will increase the noise entering the loop, and the loop is more likely to lose lock. [0003] In the high dynamic carrier tracking algorith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29
CPCG01S19/29
Inventor 田甜于志杰赵鹏张金巍朱倩崔超赵欢程立明
Owner 北京轩宇信息技术有限公司
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