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Radio frequency structure for realizing function of switching dual-band GPS satellite signal into base band signal

A technology of satellite signals and baseband signals, applied in satellite radio beacon positioning systems, radio wave measurement systems, beacon systems using radio waves, etc., and can solve problems such as reducing the signal-to-noise ratio of the system

Inactive Publication Date: 2010-01-20
SHANGHAI HUACE NAVIGATION TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

[0009] In this design scheme, since the two channels of L1 and L2 use the same first local oscillator signal 58 for the first down-conversion, it will inevitably cause mutual crosstalk of the two channel signals, reducing the signal-to-noise ratio of the system

Method used

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  • Radio frequency structure for realizing function of switching dual-band GPS satellite signal into base band signal
  • Radio frequency structure for realizing function of switching dual-band GPS satellite signal into base band signal
  • Radio frequency structure for realizing function of switching dual-band GPS satellite signal into base band signal

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Embodiment Construction

[0052] In order to understand the technical content of the present invention more clearly, the following examples are given in detail.

[0053] see Figure 2 to Figure 6 As shown, the radio frequency circuit structure that realizes the function of converting dual-frequency GPS satellite signals into baseband signals includes an antenna receiving function module, wherein the circuit structure also includes a signal branching function module, a first channel signal processing function module, The second channel signal processing functional module, the local oscillator signal and the clock signal generation functional module, the antenna receiving functional module is respectively connected with the first channel signal processing functional module and the second channel through the signal branching functional module The signal processing function modules are connected;

[0054] The first channel signal processing function module includes a first channel signal first-stage frequ...

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Abstract

The invention relates to a radio frequency structure for realizing the function of switching dual-band GPS satellite signal into base band signal; wherein GPS satellite signal is divided into circuits of L1 frequency band and L2 frequency band, and generation circuits of local oscillator 1743MHz, 1059MHz, 336MHz and clock signal 25MHz, a processing circuit for converting down GPS satellite signal into intermediate frequency signal, and a circuit of I path and Q path digital signal obtained by processing the intermediate frequency signal by orthogonal demodulation, filtration and A / D conversion after being received. The difference between a primary local oscillator signal frequency of L1 and the L1 frequency band of GPS satellite signal is positive, the difference between a secondary local oscillator signal frequency of L2 and the L2 frequency band of GPS satellite signal is negative, and the primary local oscillator signal frequency of L1 and the primary local oscillator signal frequency of L2 are respectively generated by different frequency synthesizers. The adoption of the radio frequency structure not only solves the mutual interference problem of channel signals, but also enhances the signal-to-noise ratio of the system. The circuit structure is simple and practical, the working performance is stable and reliable, and the application range is wider.

Description

technical field [0001] The invention relates to the field of GPS navigation positioning and measurement, in particular to the technical field of dual-frequency GPS satellite signal receiving and processing devices, and specifically refers to a radio frequency circuit structure for realizing the function of converting dual-frequency GPS satellite signals into baseband signals. Background technique [0002] GPS (Global Positioning System) is a global navigation and positioning system that uses satellites to transmit signals and receivers on the earth's surface or near the ground to receive signals to measure the position and time of observed objects. GPS satellite signals are synthesized using typical code division multiple access (CDMA) modulation technology, and its complete signal mainly includes three components: carrier, pseudo-random code and data code. The signal carrier is in the L-band, and the frequencies of the two carriers are denoted as L1 (1575.42MHz) and L2 (122...

Claims

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Application Information

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IPC IPC(8): G01S1/02G01S5/02
CPCG01S19/36G01S19/32
Inventor 王永泉
Owner SHANGHAI HUACE NAVIGATION TECH
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