Navigation signal acquiring method based on compressed sensing

A navigation signal and acquisition method technology, applied in the field of navigation signal acquisition based on compressed sensing theory, can solve the problem of high sampling frequency, achieve the effect of reducing transmission pressure, reducing work burden, and overcoming the requirements for hardware

Inactive Publication Date: 2012-12-19
XIDIAN UNIV
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Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a method based on compressed sensing that solves the high sampling frequency of the existing navigation signal collection method, can use a lower sampling frequency to collect navigation signals and can reconstruct navigation signals with high probability navigation signal collection method

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  • Navigation signal acquiring method based on compressed sensing
  • Navigation signal acquiring method based on compressed sensing
  • Navigation signal acquiring method based on compressed sensing

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Embodiment Construction

[0022] The patent of the present invention realizes the acquisition of navigation signals at low sampling frequency through a method of random sparse sampling on the basis of compressed sensing theory. A new method of navigation signal acquisition through figure 1 The principle block diagram shown in the figure realizes that the navigation signal is randomly and sparsely sampled, and the signal reconstruction is completed through the weighted L1 norm optimization algorithm.

[0023] Define the original signal as . If the signal is in a fixed orthogonal basis The following is sparse, find the transformation coefficient ; Then design an observation matrix , for the transformation coefficient Make observations to get observation sets ;Finally, an approximation of the solution is obtained using an optimization problem in the 1-norm sense: .

[0024] The specific steps of the novel navigation signal acquisition method based on the compressed sensing theory of the...

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Abstract

The invention relates to a navigation signal acquiring method based on compressed sensing. Navigation signals are projected to form low-dimensional observation vectors by an observation matrix, the sparse optimization problem is solved at a signal reconstruction end, and high-dimensional navigation signals are reconstructed by the low-dimensional observation vectors at high probability. Requirements of Nyquist sampling frequency to hardware are met well, an acquiring device is only required to work in a low-speed sampling state to acquire measuring values, and the navigation signals can be reconstructed at a computing center, so that the workload of the acquiring device is greatly reduced, and data transmitting pressure on a transmitting system is relieved.

Description

technical field [0001] The invention belongs to the field of compressed sensing and signal processing, in particular to a navigation signal acquisition method based on compressed sensing theory. technical background [0002] Satellite navigation system has been widely used and developed in military and civilian fields because it can provide high-precision position, speed and time information to any place in the world around the clock, and it is a key technical support related to international people's livelihood system. The satellite navigation system converts navigation information into coded pulses and completes it in digital communication. Considering the confidential communication, the selection of signals transmitted by each satellite and the precision ranging, the coded pulse is first modulated onto the pseudo-random code (including the coarse (C / A) code and the fine (P) code), that is, spread by the pseudo-random code , and then perform biphase modulation on the car...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/31G01S19/37
Inventor 冯冬竹苏哲何晓川袁晓光周江水韩国华许录平
Owner XIDIAN UNIV
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