Intermediate frequency data acquisition and playback system in GNSS (global navigation satellite system) receiver

An intermediate frequency data and receiver technology, applied in the field of GNSS satellite navigation system, can solve problems such as shortening development time, achieve the effects of ensuring continuity and real-time performance, wide application range, and benefiting universality

Inactive Publication Date: 2012-06-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the debugging of the receiver, we need a continuous satellite data stream that meets the baseband requirements, and the realization of the data playback function solves the problem of having to go outdoors for debugging,

Method used

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  • Intermediate frequency data acquisition and playback system in GNSS (global navigation satellite system) receiver
  • Intermediate frequency data acquisition and playback system in GNSS (global navigation satellite system) receiver
  • Intermediate frequency data acquisition and playback system in GNSS (global navigation satellite system) receiver

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Embodiment Construction

[0021] Such as figure 1 As shown, the present invention is based on multimode GNSS satellite receiving chip, FPGA chip, USB chip, multimode GNSS intermediate frequency data acquisition and playback platform of host computer, constitutes and comprises radio frequency front-end unit, FPGA control unit, USB interface transmission unit and host computer part of the system.

[0022] Among them, the SPI program inside the FPGA is used as a module to communicate with the RF front-end unit bidirectionally to complete the switching of the RF front-end working mode. In the data acquisition function, the FPGA control unit contains four modules: a serial-to-parallel conversion module, an asynchronous FIFO buffer module, a USB interface timing module, and a total state machine (FSM) module. The RF front-end unit is unidirectionally connected to the serial-to-parallel conversion module, followed by an asynchronous FIFO buffer module, a USB interface timing module, and a general state machi...

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Abstract

The invention relates to an intermediate frequency data acquisition and playback system in a GNSS (global navigation satellite system) receiver. An antenna is connected with a radio frequency front-end unit, an SPI (single-point imaging) module is in two-way connection with the radio frequency front-end unit, the radio frequency front-end unit is connected with an FPGA (field-programmable gate array) control unit is in two-way connection with a USB (universal serial bus) interface transmission unit, and the USB interface transmission unit is in two-way connection with an upper computer; the radio frequency front-end unit is used for receiving satellite signals and outputting intermediate frequency signals, the SPI module is used for configuring the working mode of the radio frequency front-end unit and performing switching among a plurality of satellite navigation systems, the FPGA control unit is used for performing series-parallel conversion on the intermediate frequency signals and then saving the intermediate frequency signals into an asynchronous FIFO (first in first out) buffer module, a USB interface time sequence module is used for reading out data stored in the FIFO buffer module and then writing the data into the USB interface transmission unit, and the upper computer is used for storing the data which is red from the USB interface transmission unit into a local hard disc. A data stream after format conversion is transmitted into the intermediate frequency input end of a base band under the trigger of a base band clock through the control of the upper computer during the playback of the data.

Description

technical field [0001] The invention relates to a GNSS satellite navigation system, in particular to an intermediate frequency data collection and playback system for a GNSS receiver, and is especially suitable for research and development of receivers based on multi-mode GNSS satellite navigation systems. Background technique [0002] With the completion and improvement of various navigation satellite systems around the world, satellite navigation and positioning receivers are widely used, from a single GPS era to a new era of multi-constellation coexistence and compatibility with GNSS, leading to the globalization of satellite navigation systems and enhanced multi-mode. The gradual improvement and enhancement of the GNSS system has made compatibility and interoperability one of the new focuses, and how to make full use of the advantages of multiple systems from an optimal perspective is a trend in future development. The GNSS receiver based on software radio technology has...

Claims

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Application Information

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IPC IPC(8): G01S19/23
Inventor 潘树国王庆陈冲
Owner SOUTHEAST UNIV
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