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Satellite receiver baseband signal processing method assisted by inertia information

A baseband signal processing and satellite receiver technology, applied in satellite radio beacon positioning systems, baseband systems, instruments, etc., can solve problems such as difficulty in meeting high dynamic and high precision requirements, poor tracking robustness, etc. High, high tracking accuracy, good robustness

Inactive Publication Date: 2014-05-14
NAT UNIV OF DEFENSE TECH
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  • Claims
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Problems solved by technology

[0006] However, the current inertial information-assisted GNSS baseband signal processing method mainly uses 2nd-order or 3rd-order PLL to track the carrier signal, which has the following disadvantages: when the inertial error is large, the tracking robustness is poor, and it is difficult to meet the increasingly urgent needs of aerospace and aviation. High dynamic and high precision requirements

Method used

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  • Satellite receiver baseband signal processing method assisted by inertia information
  • Satellite receiver baseband signal processing method assisted by inertia information
  • Satellite receiver baseband signal processing method assisted by inertia information

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Such as figure 1 Shown is a schematic flow chart of the satellite receiver baseband signal processing method assisted by inertial information of the present invention; see figure 2 , is a schematic diagram of a tracking loop structure, and the specific flow of the present invention when applied therein is:

[0031] 1. Establish a state-space equation suitable for a highly dynamic 4th-order PLL carrier tracking loop, in which the estimated value of the carrier phase is Doppler shift Doppler shift rate Doppler shift acceleration As a state variable, the output of the carrier phase detector as a measured value.

[0032] That is, the state vector of the state space equation for establishing a highly dynamic 4th-order PLL carrier tracking loop is:

[0033] X k = ...

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Abstract

The invention discloses a satellite receiver baseband signal processing method assisted by inertia information, which comprises the following steps: (1) a state-space equation suitable for a high dynamic four-order PLL (Phase Locked Loop) carrier wave tracking loop is established; (2) a carrier wave phase and Doppler frequency shift are estimated with a four-order PLL carrier wave tracking loop model in a forecast and estimation method and are used for computing the controlled quantity of a carrier wave NCO (Numerically Controlled Oscillator); (3) inertia assistance information is introduced to compute the line-of-sight velocity from a carrier to a satellite to obtain the current Doppler frequency shift which is used for assisting the tracking of the carrier wave loop, and the controlled quantity of the carrier wave NCO is computed; and (4) a code tracking loop is assisted by the Doppler frequency shift estimated by the four-order PLL carrier wave tracking loop, and a two-order DLL is adopted for the code tracking loop. The method disclosed by the invention has the advantages of high dynamic nature, small tracking error, good robustness, wide range of application and the like.

Description

technical field [0001] The invention mainly relates to the field of satellite navigation and GNSS / INS integrated navigation system, in particular to a method for using inertial information to assist satellite baseband signal processing. Background technique [0002] Global Navigation Satellite System (GNSS, Global Navigation Satellite System) mainly includes GPS (Global Positioning System) of the United States, GLONAS S (GLObal NAvigation Satellites System) of Russia, Galileo of Europe, and Beidou navigation system of my country, etc., which are global and all-weather , Continuous, real-time precise three-dimensional navigation and positioning capabilities, and its error does not diverge over time, but it is susceptible to occlusion and interference. [0003] Inertial Navigation System (INS, Inertial Navigation System) is a completely autonomous navigation system, which has the advantages of not relying on external information, good concealment, strong radiation resistance, a...

Claims

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Application Information

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IPC IPC(8): H04L25/00G01S19/25G01S19/29
Inventor 唐康华何晓峰潘献飞胡小平郭瑶罗兵罗勇
Owner NAT UNIV OF DEFENSE TECH