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Carrier wave aided tracking method used in high-dynamic double frequency GPS

A highly dynamic, carrier technology, applied in the field of dual-frequency GPS systems, can solve the problem of carrier tracking not working

Inactive Publication Date: 2009-09-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In a highly dynamic environment, the carrier tracking of L2 itself is often unable to work

Method used

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  • Carrier wave aided tracking method used in high-dynamic double frequency GPS
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  • Carrier wave aided tracking method used in high-dynamic double frequency GPS

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Embodiment Construction

[0024] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments.

[0025] Reference will now be made to detailed embodiments of the general inventive concept, examples of which are shown in the accompanying drawings, figure 1 A GPS receiver is depicted. It receives GPS satellite signals through antenna 1. The received signal is amplified by low noise amplifier 2 and separated into L1 signal and L2 signal by splitter 3, and then the splitter will L1 The signal is sent to the down-converter 4, and the L2 signal is sent to the down-converter 27.

[0026] The L1 downconverter 4 converts the received L1 signal from the L1 frequency to a frequency suitable for the analog / digital converter 5. The analog / digital converter 5 down-converts the signal at the sampling rate of the Nyquist sampling theorem Take samples and gen...

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Abstract

The invention relates to a carrier wave aided tracking method used in a high-dynamic double frequency GPS, which is as follows: a carrier wave phase lock tracking loop and a pseucode delay locked loop are executed for regulating carrier wave NCO and C / A code NCO of local L1 frequency points to generate guess values deferred by an L1 carrier wave phase and a C / A code; a half codeless method is used for tracking L1-P (Y) signals by using a pseucode delay locked loop (DLL); an L2-P code generator is initialized; according to the guess value of an L1 loop carrier wave phase, reference oscillator frequency offset dissolved by a positioning resolving module, phase demodulation difference of an L2 carrier wave phase lock tracking loop (PLL), the carrier wave phase value of L2 frequency points is jointly estimated; a carrier wave NCO is regulated, and the local L2 signal carrier wave is recurred; the half codeless method is used for precisely tracking input L2 signals. The L2-P carrier wave tracking using the method can obtain higher tracking accuracy, lower tracking threshold and more stable loop in high-dynamic environment.

Description

Technical field [0001] The invention relates to a dual-frequency GPS system, in particular to a dual-frequency GPS carrier auxiliary tracking method for high dynamics. Background technique [0002] GPS (Global Positioning System) contains several satellites. Each satellite transmits ranging signals on two carrier frequencies called L1 and L2, 1575.42MHz and 1227.60MHz, and passes the ephemeris and almanac and other text messages through the two carrier frequencies. The phase modulation method modulates the ranging signal. A GPS receiver receives signals from multiple satellites, and uses the locally reproduced carrier and pseudo-code to measure and obtain (1) the time delay of the signal reaching the receiver; (2) the Doppler frequency offset of the signal carrier; (3) The text information modulated on the signal. The receiver then uses this information to determine its position and velocity in a known way. [0003] The signal at frequency L1 is modulated by two pseudo-random cod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S1/02G01S5/02
Inventor 张磊曾涛刘峰龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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