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Method and terminal for Doppler frequency compensation of Beidou rdss terminal

A technology of Doppler frequency and terminal, applied in the field of Doppler frequency compensation of Beidou RDSS high dynamic terminal transmission signal, can solve the problems of Doppler frequency compensation lag, not considering the frequency offset of crystal oscillator, complex transmission circuit, etc. Achieve the effect of simple circuit structure, low power consumption and small size

Active Publication Date: 2020-04-24
TECHTOTOP MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a technical solution suitable for the Doppler frequency compensation of Beidou RDSS high-dynamic user terminal transmission signals. The technical solution can use the mainstream RDSS radio frequency chip in the market, and has a simple circuit structure, small size, and low power consumption. Advantages, can solve practical application defects such as complex transmitting circuit, Doppler frequency compensation lag, and no consideration of frequency offset of crystal oscillator in existing technical solutions

Method used

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  • Method and terminal for Doppler frequency compensation of Beidou rdss terminal
  • Method and terminal for Doppler frequency compensation of Beidou rdss terminal
  • Method and terminal for Doppler frequency compensation of Beidou rdss terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0020] 1) The RDSS navigation signals broadcast by the five geostationary orbit (GEO) satellites of the Beidou Satellite Navigation System (BDS) space constellation are received, filtered and amplified by the user terminal receiving antenna 1, and then down-converted, amplified and amplified by the down-converter 2 Filter processing, and then perform analog-to-digital conversion through the ADC 3, and then enter the digital receiving circuit 4 to perform processing such as capturing and tracking of navigation signals.

[0021] 2) Down-conversion 2, ADC 3, digital receiving circuit 4, transmitting code NCO 7, spread spectrum 8, and BPSK modulation 9 all use the same frequency source, which uses a crystal oscillator with low acceleration sensitivity.

[0022] 3) If the user terminal is in a static state when starting up, then the local crystal oscillator frequency offset calculation unit 5 can utilize the code frequency control word output by the digital receiving circuit 4 to ca...

Embodiment approach 2

[0038] 1) The RDSS navigation signals broadcast by the five geostationary orbit (GEO) satellites of the Beidou Satellite Navigation System (BDS) space constellation are received, filtered and amplified by the user terminal receiving antenna 1, and then down-converted, amplified and amplified by the down-converter 2 Filter processing, and then perform analog-to-digital conversion through the ADC 3, and then enter the digital receiving circuit 4 to perform processing such as capturing and tracking of navigation signals.

[0039] 2) Down-conversion 2, ADC 3, digital receiving circuit 4, transmitting code NCO 7, spread spectrum 8, and BPSK modulation 9 all use the same frequency source, which uses a crystal oscillator with low acceleration sensitivity.

[0040] 3) If the user terminal is in a static state when starting up, then the local crystal oscillator frequency offset calculation unit 5 can use the carrier frequency control word output by the digital receiving circuit 4 to cal...

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Abstract

The invention provides a method for Beidou RDSS terminal Doppler frequency compensation. The method includes the following steps: when the terminal is in a static state, local crystal oscillator frequency offset of the terminal is calculated; when the terminal moves at high speed, the local crystal oscillator frequency offset and a carrier frequency control word output by and a digital receiving circuit (4) are utilized to calculate an emitting code NCO frequency control word and emitting PLL parameters, the emitting code NCO frequency control word is utilized to control emitting code NCO output, and the emitting PLL parameters are utilized to control BPSK modulation. After adoption of the abovementioned technical scheme, a user terminal radio frequency circuit is the same as an ordinary user terminal circuit, can use a market mainstream RDSS radio frequency chip, and a user terminal can stably and reliably realize an RDSS service request under a high dynamic condition only by modification of software. Compared with the prior art, the technical scheme has the advantages of simple circuit structure, strong universality, small size and low power consumption.

Description

technical field [0001] The invention relates to a method for Doppler frequency compensation of a Beidou RDSS terminal and a terminal, in particular to a method for Doppler frequency compensation of a signal transmitted by a Beidou RDSS high dynamic terminal and a corresponding terminal. Background technique [0002] Since the construction of the Beidou satellite navigation test system in 1994, the application of the Beidou satellite navigation system RDSS (Radio Determination Satellite Service, Radio Determination Satellite Service) subsystem in various industries has become increasingly mature, resulting in extensive social and economic benefits. Its unique fast positioning, position reporting and short message communication functions make it more and more used in aviation and aerospace fields. However, the high-speed movement of aircraft and other carriers makes the signals emitted by Beidou RDSS high-dynamic user terminals be captured by the RDSS subsystem When receiving,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/23
CPCG01S19/235
Inventor 王晓菊毛锐周波
Owner TECHTOTOP MICROELECTRONICS
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