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A frequency estimation device, terminal and computer-readable medium

A frequency estimation and frequency technology, applied in the GNSS field, can solve problems such as the inability to quickly realize continuous wave interference suppression, difficulty in continuous wave interference signal detection, and inability to quickly and accurately estimate, so as to improve operation efficiency, improve tracking sensitivity, and increase speed and the effect of efficiency

Active Publication Date: 2022-02-25
COMNAV TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in GNSS signal reception, continuous wave signal interference is ubiquitous. In actual work, at least one of the following problems exists: it is impossible to quickly and accurately estimate the frequency value of continuous wave interference in GNSS satellite navigation signals, and it is impossible to quickly realize continuous wave interference. Suppression, so that in the continuous wave interference environment, the GNSS receiving device has problems such as difficulty in detecting continuous wave interference signals, low tracking sensitivity, and low work efficiency

Method used

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  • A frequency estimation device, terminal and computer-readable medium
  • A frequency estimation device, terminal and computer-readable medium
  • A frequency estimation device, terminal and computer-readable medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment one, such as figure 1 and 2 As shown, the frequency sweep unit includes:

[0047] a frequency estimator for estimating and outputting the frequency of the continuous wave signal; and

[0048] A frequency sweeper, connected to the frequency estimator, used to output data such as frequency point information, the frequency sweeper includes:

[0049] The local NCO outputs sine and cosine signals (correspondingly through the sine table and cosine table), and the local carrier m generated by the local NCO adopts the following formula: is the carrier phase, and j is the imaginary unit of the complex number;

[0050] The noise-containing continuous wave complex signal s input to the frequency sweeper adopts the following formula: s=i+qj, i is the signal of the positive phase branch (I branch), and q is the signal of the quadrature branch (Q branch) , j is the imaginary part of the complex number,

[0051] The first multiplier M1 multiplies the input signal i ...

Embodiment 2

[0062] Embodiment two, such as image 3 As shown, the same parts of Embodiment 2 and Embodiment 1 will not be repeated, and the difference is that the frequency sweeper also includes an acceleration module, wherein the acceleration module includes:

[0063] The second adder B2 is connected to the first multiplier M1 and the third multiplier M3, adds the first signal and the third signal, and outputs the positive phase branch mixing result of the negative mixing signal;

[0064] The third coherent integrator, connected to the second adder B2, performs coherent integration calculation according to the positive-phase branch mixing result of the received negative-going mixing signal, and outputs the third coherent integration result;

[0065] The second subtractor A2 is connected to the second multiplier M2 and the fourth multiplier M4, subtracts the fourth signal from the second signal, and outputs the quadrature branch mixing result of the negative mixing signal;

[0066] The f...

Embodiment 3

[0080] Embodiment three, such as Figure 4 As shown, the same parts of Embodiment 3 and Embodiment 2 will not be repeated, the difference is that the frequency sweeper also includes a first non-coherent integrator and a second non-coherent integrator, wherein,

[0081] The first non-coherent integrator is connected to the first amplitude calculator C1 and the frequency estimator, the first non-coherent integrator receives the first MAG value, and performs non-coherent integration calculation to obtain the first non-coherent integration result;

[0082] The second non-coherent integrator is connected to the second amplitude calculator C2 and the frequency estimator, the second non-coherent integrator receives the second MAG value, and performs non-coherent integration calculation to obtain a second non-coherent integration result;

[0083] The frequency estimator estimates and outputs the frequency of the continuous wave signal according to the received first and second non-coh...

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Abstract

The present invention relates to a frequency estimation device, which includes at least one stage of frequency sweeping unit, and the frequency sweeper includes: a local NCO, first to fourth multipliers, and a first subtractor, connected to the first and third multipliers, and output positive Mixing the result of the positive phase branch of the mixed frequency signal; the first coherent integrator is connected to the first subtractor, and outputs the first coherent integration result according to the mixed result of the positive phase branch of the received forward mixed frequency signal; The first adder is connected to the second and fourth multipliers, and outputs the mixed result of the quadrature branch of the forward mixing signal; the second coherent integrator is connected to the first adder, and receives the forward mixing signal according to Frequency signal quadrature branch mixing result, output the second coherent integration result; the first amplitude calculator, according to the received first coherent integration result and the second coherent integration result, calculate the first MAG value, the first amplitude The value calculator is also connected to the frequency estimator, and the frequency estimator estimates and outputs the frequency of the continuous wave signal according to the first MAG value.

Description

technical field [0001] The present invention relates to the field of GNSS, in particular to a frequency estimation device, a terminal and a computer-readable medium. Background technique [0002] At present, the frequency estimation of continuous wave signals in noise is a classic subject of signal processing, and has important applications in the fields of communication, radar, electronic reconnaissance, vibration signal and navigation signal processing. Especially in GNSS signal reception, continuous wave signal interference is ubiquitous. In actual work, at least one of the following problems exists: it is impossible to quickly and accurately estimate the frequency value of continuous wave interference in GNSS satellite navigation signals, and it is impossible to quickly realize continuous wave interference. So that in the continuous wave interference environment, the GNSS receiving device has problems such as difficulty in detecting continuous wave interference signals, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02G01S19/21
CPCG01R23/02G01S19/21
Inventor 张禛君徐敏翟晓东王永泉
Owner COMNAV TECH
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