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High sensitivity GPS signal carrier tracking method

A GPS signal, carrier tracking technology, applied in radio wave measurement systems, satellite radio beacon positioning systems, instruments, etc., can solve problems such as carrier synchronization and bit synchronization difficulties

Active Publication Date: 2007-10-10
GUANGDONG DESAY CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] In the case of low signal-to-noise ratio of the received GPS signal, carrier synchronization and bit synchronization are difficult

Method used

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Embodiment Construction

[0019] Fig. 1 is a block diagram of the carrier tracking loop in the present invention, and the meanings of the signals in the figure are as follows. 101 is the output of the Prompt correlator in the traditional GPS receiver, and the signal can be obtained from the hardware register by means of interrupt or software query. Each time a new output value 101 of the correlator is obtained, it is sent to a FIFO-like buffer realized by software, and the size of the buffer can be set by software. 102 is the result of accumulating the stored values ​​in the buffer, and 102 is sent to a four-quadrant arctangent frequency detector and a two-quadrant arctangent phase detector respectively, and a frequency error estimation signal 103 and a phase error estimation signal 104 can be obtained respectively 103 and 104 pass through the loop filter to obtain the control signal 105 of the digitally controlled oscillator, which controls the frequency of the local reproduced carrier generated by th...

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Abstract

A method for tracking GPS signal carrier wave with high sensitivity includes enabling to eliminate phase estimation error caused by data modulation when carrier wave loop is quickly restrained by making selection on frequency-lock ring frequency detection algorithm in carrier wave tracking loop and phase-lock loop phase detection algorithm, enabling to raise sensitivity of receiver and to decrease tracking error of low frequency by utilizing software to carry out FIFO buffer treatment on output value of correlator in each stage of carrier-wave track.

Description

technical field [0001] The invention relates to the technical field of global positioning, in particular to a method for carrier tracking of satellite signals in a high-sensitivity receiver. Background technique [0002] Commonly used GPS (Global Satellite Positioning System) receivers usually use multi-channel correlators to track satellite signals and demodulate navigation data after completing the capture of GPS signals. The GPS signal transmitted by each satellite is a direct sequence spread spectrum signal, the L1 carrier frequency is 1.57542GHz, and has a coarse code (C / A) code rate of 1.023M. The C / A code sequence has a length of 1023 chips, corresponding to a time period of 1 millisecond. Each satellite transmits a different C / A code, and there is almost no interference between the satellite signals received by the receiver. The navigation message is modulated on each satellite signal in BPSK mode at a rate of 50bps, and its bit boundary is aligned with the beginni...

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Application Information

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IPC IPC(8): G01S5/14G01S19/29
Inventor 李金海陈杰牟荣增
Owner GUANGDONG DESAY CORP
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