Frequency estimation device, terminal and computer readable medium

Abstract

The invention relates to a frequency estimation device, comprising at least a primary frequency sweeping unit. A frequency sweeper comprises a local NCO, first to fourth multipliers, a first subtractor connected to the first and third multipliers and used for outputting a positive phase branch frequency mixing result of a forward frequency mixing signal, a first coherent integrator connected to the first subtractor and used for outputting a first coherent integration result according to the received positive phase branch frequency mixing result of the forward frequency mixing signal, a first adder connected to the second and fourth multipliers and used for outputting an orthogonal branch frequency mixing result of a forward frequency mixing signal, a second coherent integrator connected tothe first adder and used for outputting a second coherent integration result according to the received orthogonal branch frequency mixing result of the forward frequency mixing signal, and a first amplitude calculator used for performing calculation to obtain a first MAG value according to the received first coherent integration result and the second coherent integration result, and the first amplitude calculator is further connected to a frequency estimator, and the frequency estimator estimates and outputs the frequency of the continuous wave signal based on 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, ...

Examples

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...

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, ...

Examples

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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