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Intermediate frequency digital down-conversion method, circuit, baseband chip and satellite navigation receiver

A digital down-conversion and intermediate frequency technology, applied in the field of satellite navigation and positioning, can solve the problems of multiple hardware resources and poor compatibility, and achieve the effect of reducing chip area, good compatibility and good applicability

Pending Publication Date: 2021-04-30
湖南北云科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, the current technical solution not only requires more hardware resources, but also has poor compatibility.

Method used

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  • Intermediate frequency digital down-conversion method, circuit, baseband chip and satellite navigation receiver
  • Intermediate frequency digital down-conversion method, circuit, baseband chip and satellite navigation receiver
  • Intermediate frequency digital down-conversion method, circuit, baseband chip and satellite navigation receiver

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Embodiment Construction

[0047] like figure 1 Shown is the schematic flow chart of the method of the present invention: this intermediate frequency digital down-conversion method provided by the present invention comprises the following steps:

[0048] S1. Obtain the input AD data;

[0049] S2. Carry out format conversion and frequency point selection to the input AD data; Specifically, according to the bit number, IQ form and encoding method of the input AD data, the input AD data is uniformly converted into IQ dual-way 10bit complement code data; At the same time, in order to facilitate subsequent unified processing, eight frequency point data of B1, B2, L1, L2, G1, G2, B3 and L5 are extracted from the input AD data; finally, the following rules are used for output settings:

[0050] If the input data is AD data input by a single channel I, after format conversion and frequency point selection, the output I channel data is the input I data, and the output Q data is 0;

[0051] If the input data is...

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Abstract

The invention discloses an intermediate frequency digital down-conversion method. The method comprises the following steps that input AD data is obtained; format conversion and frequency point selection are carried out; frequency mixing and broadband filtering are carried out; down-sampling is carried out to obtain a final broadband zero-frequency signal; and narrowband filtering is carried out to obtain a final narrowband zero-frequency signal. The invention also discloses a circuit comprising the intermediate frequency digital down-conversion method. The invention also discloses a baseband chip comprising the intermediate frequency digital down-conversion method and circuit. The invention further discloses a satellite navigation receiver comprising the intermediate-frequency digital down-conversion method, the intermediate-frequency digital down-conversion circuit and a baseband chip. According to the invention, the resource consumption and the chip area are reduced, and the adaptability to a radio frequency front end and the chip design, development and test efficiency are improved; and moreover, less hardware resources are occupied, and the compatibility, reliability and applicability are high.

Description

technical field [0001] The invention belongs to the field of satellite navigation and positioning, and in particular relates to an intermediate frequency digital down-conversion method, a circuit, a baseband chip and a satellite navigation receiver. Background technique [0002] With the development of economy and technology and the improvement of people's living standards, satellite navigation and positioning technology has been widely used in people's production and life, bringing endless convenience to people's production and life. [0003] At present, there are four major satellite navigation systems in the world, namely: GPS, BDS (Beidou System), GLONASS and Galileo. Each system has multiple frequency points, each frequency point contains one or more signal components, and signal components of different frequency points in different systems often have different parameters such as signal bandwidth. According to the current public signal parameters of major satellite nav...

Claims

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Application Information

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IPC IPC(8): G01S19/13G01S19/37G01S19/42H03D7/16
CPCG01S19/13G01S19/37G01S19/42H03D7/16
Inventor 王东会郑彬向为易文鑫
Owner 湖南北云科技有限公司
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