Variable gain high sensitivity GPS receiver baseband frequency tracking method

A GPS signal and carrier tracking technology, used in instruments, measuring devices, satellite radio beacon positioning systems, etc., can solve problems such as carrier synchronization and bit synchronization difficulties, achieve simple, effective and easy to implement, improve receiving sensitivity, high GPS The effect of signal tracking

Active Publication Date: 2007-10-10
GUANGDONG DESAY CORP
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Problems solved by technology

[0003] In the case of low signal-to-noise ratio of the received GPS

Method used

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  • Variable gain high sensitivity GPS receiver baseband frequency tracking method
  • Variable gain high sensitivity GPS receiver baseband frequency tracking method

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[0017] Figure 1 is a block diagram of the carrier tracking loop in the present invention. The meanings of the signals in the figure are as follows. 101 is the output of the Prompt Correlator in the traditional GPS receiver. The signal can be obtained from the hardware register by means of interrupt or software query. The new output value 101 of the correlator obtained each time is sent to a four-quadrant arctangent frequency discriminator and a four-quadrant arctangent phase discriminator, and the frequency error estimation signal 102 and the phase error estimation signal 103 can be obtained respectively. 102 and 103 After the loop filter is processed, the control signal 104 of the digital control oscillator is obtained, which controls the frequency of the local reproduced carrier generated by the digital control oscillator, and 105 is the output signal of the digital control oscillator.

[0018] Figure 2 is a schematic diagram of a method for GPS signal carrier tracking using the...

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Abstract

A method for tracking base band frequency of high-sensitivity GPS receiver in variable gain mode includes enabling to eliminate phase estimation error caused by data modulation when carrier wave tracking loop is restrained quickly by making selection on frequency lock ring frequency detection algorithm in carrier wave tracking loop and phase-lock loop phase detection algorithm, enabling to obviously raise sensitivity of receiver and to decrease frequency tracking error by utilizing software to vary phase detector gain and frequency detector gain as well as digital control oscillator gain in carrier wave tracking loop at each stage in 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 signals transmitted by the navigation satellites are all direct sequence spread spectrum signals, the carrier frequency is 1.57542GHz, and the code rate of the coarse code (C / A) code is 1.023Mchip / s. The code length of the C / A code sequence is 1023, and the corresponding time period is 1 millisecond. Each satellite transmits different C / A codes, and code division multiple access is realized at the receiver side, so there is almost no interference between the satellite signals received by the receiver. The navigation message is modulated on each ...

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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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