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A high-precision carrier-to-noise ratio estimation method and system

A carrier-to-noise ratio, high-precision technology, applied in radio wave measurement system, noise figure or signal-to-noise ratio measurement, satellite radio beacon positioning system, etc. issues such as further improvement

Active Publication Date: 2020-09-18
XIAN INSTITUE OF SPACE RADIO TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] The technical problem solved by the present invention is: in view of the current existing technology, the known carrier-to-noise ratio estimation method is difficult to further improve the accuracy, and at the same time cannot accurately reflect the slight fluctuation of the signal quality of the receiver, and proposes a high-precision carrier-to-noise ratio Estimation method and system

Method used

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  • A high-precision carrier-to-noise ratio estimation method and system
  • A high-precision carrier-to-noise ratio estimation method and system
  • A high-precision carrier-to-noise ratio estimation method and system

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Experimental program
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Effect test

Embodiment 1

[0156] Such as figure 1 For the complex frequency conversion receiver shown, the implementation steps of carrier-to-noise ratio estimation are as follows:

[0157] (1) The orthogonal I and Q two-way AD sampling signals enter the carrier tracking module, perform complex frequency conversion, and generate two frequency conversion values, which are the frequency conversion value of the in-phase branch and the frequency conversion value of the quadrature branch, and generate the calculation formula of the frequency conversion value as follows:

[0158]

[0159]

[0160] where ddc i 、ddc q Respectively represent the frequency conversion value of the in-phase branch and the frequency conversion value of the quadrature branch, The item represents the I channel AD sampling, The item represents the Q channel AD sampling, where P d Indicates the sampling signal power, ω i Indicates the circular frequency of the sampling signal, T s Indicates the sampling period, n indic...

Embodiment 2

[0182] Such as figure 2 For the complex frequency conversion receiver shown, the implementation steps of carrier-to-noise ratio estimation are as follows:

[0183] (1) The orthogonal I and Q two-way AD sampling signals enter the carrier tracking module, perform complex frequency conversion, and generate two frequency conversion values, which are the frequency conversion value of the in-phase branch and the frequency conversion value of the quadrature branch, and generate the calculation formula of the frequency conversion value as follows:

[0184]

[0185]

[0186] where ddc i 、ddc q Respectively represent the frequency conversion value of the in-phase branch and the frequency conversion value of the quadrature branch, The item represents the I channel AD sampling, The item represents the Q channel AD sampling, where P d Indicates the sampling signal power, ω i Indicates the circular frequency of the sampling signal, T s Indicates the sampling period, n indi...

Embodiment 3

[0208] Such as image 3 For the superheterodyne receiver shown, the implementation steps of carrier-to-noise ratio estimation are as follows:

[0209] (1) One channel of AD sampling signal enters the carrier tracking module, performs real number frequency conversion, and generates two channels of frequency conversion values, which are the frequency conversion value of the in-phase branch and the frequency conversion value of the quadrature branch, and the calculation formula of the frequency conversion value is as follows:

[0210]

[0211]

[0212] In the formula The item represents 1-way AD sampling, where P d Indicates the sampling signal power, ω i Indicates the circular frequency of the sampling signal, T s Indicates the sampling period, n indicates the sampling time, φ i Indicates the sampling signal phase, P n Indicates the sampling noise power, η i (n) represents the unit sampling noise at time n, and η i (n) is random noise with a mean value of zero; whe...

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Abstract

The invention discloses an estimation method of a high-precision carrier-to-noise ratio. The method comprises the following steps of: acquiring an observation value for a complex frequency conversionreceiver or a superheterodyne receiver; forming a power ratio of a narrowband signal to a wideband noise by respectively calculating a narrowband signal observation value and a wideband noise observation value of different kinds of receivers; and calculating through the power ratio to obtain the carrier-to-noise ratio in decibels. The estimation method and the system of the high-precision carrier-to-noise ratio overcomes the problem that various carrier-to-noise ratio estimation methods in the prior art is difficult to further improve the precision and cannot accurately reflect the slight fluctuation of the signal quality of the receiver by forming the wideband noise observation value through integrating a frequency conversion value or a virtual frequency conversion value before cleaning and calculating on the basis of the broadband frequency conversion value and the correlation value.

Description

technical field [0001] The invention relates to a high-precision carrier-to-noise ratio estimation method and system, belonging to the field of signal quality monitoring. Background technique [0002] The carrier-to-noise ratio is the ratio of the signal power received by the receiver to the noise spectral density. It is an important indicator for evaluating the quality of the signal received by the receiver. This indicator indirectly reflects the measurement and communication performance of the receiver under the current signal conditions. [0003] Search domestic open academic journals, dissertations, conference papers, patents, standards, regulations, etc. through Wanfang database. The search conditions are: cql: / / carrier-to-noise ratio estimation, and a total of 18 documents related to the conditions are retrieved; Defense Technology Information Resources Service System (DTIRSS, Defense Technology Information Resources Service System) for retrieval, the service system in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/23G01R29/26
CPCG01R29/26G01S19/23
Inventor 踪念科刘洋王登峰钟兴旺张攀刘玄
Owner XIAN INSTITUE OF SPACE RADIO TECH
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