Blind frequency detector processing method based on cross product algorithm

A processing method and a technology of a frequency discriminator, which are applied in the directions of instruments, satellite radio beacon positioning systems, measuring devices, etc., can solve the problem of inability to design a frequency discriminator loop and so on.

Active Publication Date: 2014-12-10
BEIJING RES INST OF TELEMETRY +1
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Problems solved by technology

[0009] The traditional algorithm only uses two adjacent data symbols for frequency discrimination to obtain the frequency deviation, and different frequency discrimination loops cannot be designed according to the specific application environment

Method used

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  • Blind frequency detector processing method based on cross product algorithm
  • Blind frequency detector processing method based on cross product algorithm
  • Blind frequency detector processing method based on cross product algorithm

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Embodiment Construction

[0041] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0042] The block diagram of the frequency-locked loop that adopts the frequency discriminator processing method of the present invention is as figure 1 , figure 2 said, among them, figure 1 The frequency-locked loop shown uses a first-order filter loop, figure 2 The frequency-locked loop shown uses a second-order filter loop.

[0043] The blind frequency discriminator processing method based on the cross-product algorithm of the present invention comprises the following steps:

[0044] (1), determine the input signal of the kth moment and the k-mth moment of the blind frequency discriminator, wherein m is a positive integer greater than 1;

[0045] At the kth moment, the input signal of the blind frequency discriminator is x k :

[0046] x k =I k +jQ k =a k exp(j2πkΔf k +θ k +Δθ k )+n k '

[0047] Among them, I k for the sig...

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Abstract

The invention relates to a blind frequency detector processing method based on a cross product algorithm. The method includes calculating point product component and cross product component according to the data located at the intervals of m and utilizing the cross product algorithm to calculate the output quantity of a frequency detector, wherein m is an integer larger than 1, and the specific m value can be arranged according to the system performance requirement to obtain the corresponding frequency discrimination gain. The frequency capture range of the method is not affected by the modulation phase of received signals, the residual frequency error shaking performance can be well acquired, and the effects of simple structure and low resource consumption can be acquired.

Description

technical field [0001] The invention relates to the technical field of digital wireless communication transmission, in particular to a blind frequency discriminator processing method based on a cross-product algorithm. Background technique [0002] In satellite communication systems, especially in satellite navigation communication systems such as GPS and Beidou, spread-spectrum BPSK modulation signals are widely used. In the receiver, the carrier acquisition and tracking of the despread symbol data is the key factor affecting the performance of demodulation reception. Considering the reduction of complexity and implementation cost, the receiver usually jointly adopts a frequency-locked loop (FLL) and a phase-locked loop (PLL) to realize carrier tracking. PLL has high tracking accuracy in low dynamic conditions, but it has insufficient adaptability in high dynamic environments. Therefore, a frequency-locked loop is used in high dynamic receivers to track the frequency of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/37G01S19/29
CPCG01S19/29G01S19/37
Inventor 闫朝星周三文史秀秀张永晓
Owner BEIJING RES INST OF TELEMETRY
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