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Differential correlator applied to global navigation satellite system receiver

A global navigation satellite and differential correlation technology, which is applied in the field of parallel differential correlator algorithm and structure, can solve problems such as performance impact and complex FFT calculation structure

Inactive Publication Date: 2012-10-24
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of algorithm can effectively reduce the amount of related operations, the structure of the FFT operation is relatively complex, and it includes multiplication and addition operations of complex numbers, and its performance will also be affected by the limited word length effect of parameters. In the GNSS receiver implemented

Method used

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  • Differential correlator applied to global navigation satellite system receiver
  • Differential correlator applied to global navigation satellite system receiver
  • Differential correlator applied to global navigation satellite system receiver

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Experimental program
Comparison scheme
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Embodiment 1

[0047] 1. According to the length N of the recurring code in the actual GNSS system, under the comprehensive consideration of the operational complexity and control complexity, select an appropriate degree of parallelism M, where the operational complexity can be obtained by formula (7).

[0048] 2. Select M+1 recurring codes for parallel correlation, and determine the grouping of elements offline according to the specific recurring codes and oversampling rate Q, and design a design similar to figure 2 (Q=1) or image 3 Correlator structure in (Q>1).

[0049] 3. All registers in the correlator are initialized to 0, and the input data slides through image 3 (or figure 2 ), the correlator continuously outputs the correlation result C 0 、C 1 、C 2 …C M .

[0050] Simulation results:

[0051] 1. Operational complexity analysis:

[0052] When the oversampling rate is Q, the algorithm complexity and the required correlation algorithm of the traditional correlator, differe...

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Abstract

The invention relates to a differential correlator applied to a global navigation satellite system receiver. A GNSS signal is captured in a time domain, a parallel differential structure and a correlation algorithm are adopted, and the simultaneous capture of a plurality of satellite signals is realized by multiplexing a correlation result. For oversampling existing commonly in the GNSS receiver,the computation quantity does not increase along with the increase of oversampling rate when the differential correlator computes once correlation of single recurrent code. Compared with the traditional correlation algorithm and two types of improved time-domain correlation algorithms as well as a frequency-domain correlation algorithm based on FFT, the differential correlator has the advantage on computational complexity.

Description

technical field [0001] The invention belongs to the technical field of global navigation satellite system (GNSS) hardware receivers, in particular to a parallel differential correlator algorithm and structure. technical background [0002] Global Navigation Satellite System (GNSS) is an all-weather, all-airspace navigation system. Since the US Global Navigation System (GPS) was put into use in the 1980s, people have used satellite navigation resources to provide various sectors of the national economy. Precise location and time information. [0003] Satellite navigation system adopts Direct Sequence Spread Spectrum (DSSS) technology, each satellite will spread the data bit stream to be sent with a coarse acquisition (C / A) code (the coarse acquisition code of each satellite is different) and adopt The BPSK mode is modulated into symbols, and finally passed to the radio frequency module for transmission. The essence of the C / A code is a periodic pseudo-random noise (PRN) seq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S1/04G01S5/14
Inventor 赵晋张建秋
Owner FUDAN UNIV