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Circuit structure converting GPS satellite signal into baseband signal

A satellite signal and baseband signal technology, applied in the field of satellite navigation, can solve problems such as image frequency interference, and achieve the effect of reducing crosstalk and reducing image frequency interference

Inactive Publication Date: 2016-01-20
SHANGHAI HUACE NAVIGATION TECH
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AI Technical Summary

Problems solved by technology

This can greatly reduce the difficulty of technical specification requirements for A / D conversion circuits and baseband processing circuits, but the use of mixers to convert high-frequency GPS satellite signals to lower intermediate frequency frequencies introduces image frequency interference

Method used

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  • Circuit structure converting GPS satellite signal into baseband signal

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Embodiment Construction

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0021] Such as figure 1 As shown, a circuit structure for converting GPS satellite signals into baseband signals, said circuit structure for converting GPS satellite signals into baseband signals includes signal input terminal 1, amplifier 2, power dividing circuit 3, filter circuit 4, up-conversion Circuit part 5, down-conversion circuit part 6 and baseband signal processing circuit 7, said signal input terminal 1 is connected with said power dividing circuit...

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Abstract

The invention discloses a circuit structure converting a GPS satellite signal into a baseband signal. The circuit structure is composed of a signal input terminal, an amplifier, a power division circuit, a filter circuit, an up conversion circuit part, a down conversion circuit part and a baseband signal processing circuit. The signal input terminal is connected with the power division circuit by the amplifier. The power division circuit divides a GPS satellite signal into signal channels with three frequency bands L1, L2 and L5; the L1 signal channel is connected with the baseband signal processing circuit by the filter circuit and the down conversion circuit part successively; the L2 signal channel and the L5 signal channel are connected with the baseband signal processing circuit by the filter circuit, the up conversion circuit part, and the down conversion circuit part successively. According to the invention, with the circuit structure, the crosstalk between all satellite signals is reduced and an enough signal to noise ratio can be provided for the baseband signal processing circuit.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a circuit structure for converting GPS satellite signals into baseband signals. Background technique [0002] The Global Positioning System (English: Global Positioning System, referred to as GPS), also known as the Global Positioning System, is a medium-distance circular orbit satellite navigation system. It can provide accurate positioning, speed measurement and high-precision time standards for most areas on the earth's surface. It can meet the needs of users located anywhere in the world or in near-earth space to continuously and accurately determine the three-dimensional position, three-dimensional motion and time. [0003] The GPS satellite signal is synthesized by code division multiple access (CDMA) modulation technology, and its complete signal includes carrier, pseudo-random code and data code. The signal carrier is in the L-band, and the frequencies of t...

Claims

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Application Information

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IPC IPC(8): G01S19/37G01S19/21G01S19/32
Inventor 刘强陈凯顾荣华赵康德
Owner SHANGHAI HUACE NAVIGATION TECH
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