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Device and method for precisely combining multiple frequency sources of beidou terminal module

A terminal module, frequency source technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of inaccurate frequency source, deviation, low phase detection frequency, etc., to achieve the effect of signal quality improvement, cost reduction, and space reduction

Inactive Publication Date: 2012-04-25
SHANGHAI WEIXING COMM TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problems that the frequency source synthesized in the terminal of the existing Beidou positioning system has a very low phase detection frequency or the frequency source is not accurate enough, and there is a certain deviation from the theoretical value, etc., and provides a method that can accurately synthesize multiple Beidou terminal modules. A device for a frequency source and a synthesis method implemented based on the device

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  • Device and method for precisely combining multiple frequency sources of beidou terminal module
  • Device and method for precisely combining multiple frequency sources of beidou terminal module
  • Device and method for precisely combining multiple frequency sources of beidou terminal module

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Embodiment Construction

[0023] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0024] see figure 1 , for the receiving and transmitting of the Beidou RF transceiver share a local oscillator frequency RF_LO F1 (1615.68MHz), the second local oscillator frequency IF_LO of the receiver uses the frequency scheme of F2 (863.83MHz); or the receiver of the Beidou single receiving uses RF_LO 1615.68MHz and IF_LO 863.83MHz are used as the first and second local oscillator frequency scheme. The device for accurately synthesizing multiple frequency sources of the Beidou terminal module provided by the present invention mainly includes a local oscillator frequency synthesizing unit 12 for synthesizing the local oscillator frequency used by the radio frequency transmitter and receiver in the Beidou terminal, a baseband reference clock s...

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Abstract

The invention discloses a device and a method for precisely combining multiple frequency sources of a beidou terminal module and belongs to the technical field of frequency combination in a beidou positioning system. By using a temperature compensation high-stability power transfer crystal oscillator with the frequency of 22 MHz, two local frequencies (1,615.68 MHz and 863.83 MHz) of a radio frequency transmitter and a radio frequency receiver in a beidou terminal can be combined precisely, and high phase noise can be obtained; furthermore, a reference frequency source (48.96 MHz) which is sampled and used by a base band is combined by using a digital frequency combination chip with extremely small package.

Description

technical field [0001] The invention belongs to the technical field of frequency synthesis in a Beidou positioning system, and in particular relates to a method for generating a frequency source of a Beidou terminal. Background technique [0002] Most of the existing Beidou positioning system terminals use a 16.32MHz reference clock to synthesize the frequency source in the terminal system. If 16.32MHz is used to accurately synthesize the required local oscillator frequencies of 1615.68MHz and 863.83MHz, when synthesizing 863.83MHz It will bring a problem, that is, the phase detection frequency is very low at this time, the highest is only 10KHz, and such a low phase detection frequency makes the phase noise of the synthesized 863.83MHz local oscillator frequency source very poor. Seriously affect the signal quality of the system. [0003] Another method is to synthesize a 863.84MHz frequency source, which deviates from the theoretical value by 10KHz. Because the frequency ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/18
Inventor ι™ˆδΊ•ηŽ‰
Owner SHANGHAI WEIXING COMM TECH