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A dsss_qpsk carrier phase quadrature error receiving compensation system and method

A technology of orthogonality error and carrier phase, applied in modulation carrier system, radio wave measurement system, satellite radio beacon positioning system, etc., can solve the problem of increasing signal processing overhead, degradation of demodulation performance, reduction of signal carrier orthogonality, etc. problem, achieve the effect of reducing signal processing resource overhead, preventing demodulation performance degradation, and reducing engineering constraints

Active Publication Date: 2018-10-09
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0003] However, due to the long life of the spacecraft on orbit, the orthogonality of the DSSS_QPSK signal carrier will gradually decrease, and the use of auxiliary demodulation algorithm will cause the demodulation performance to decline, and in severe cases, it will directly cause the data transmission branch to fail to demodulate
[0004] At present, the general algorithm to deal with the decrease of the orthogonality of the received signal is to track the two branches of the orthogonal signal independently, and no longer assist between branches
The demodulation performance of this method is not affected by the decrease of orthogonality, but it increases the signal processing overhead and does not fully apply all the characteristics of the signal

Method used

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  • A dsss_qpsk carrier phase quadrature error receiving compensation system and method
  • A dsss_qpsk carrier phase quadrature error receiving compensation system and method
  • A dsss_qpsk carrier phase quadrature error receiving compensation system and method

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Embodiment

[0078] Such as figure 1 As shown, a DSSS_QPSK carrier phase quadrature error receiving compensation system, the system includes a quadrature down-conversion module, a coherent integration module, a carrier synchronization module, an error phase discrimination module and an error phase compensation module;

[0079] Wherein, the quadrature down-conversion module receives the DSSS_QPSK signal, uses the carrier synchronization information sent by the carrier synchronization module to the quadrature down-conversion module to perform quadrature down-conversion on the received DSSS_QPSK signal, and generates the in-phase components of the two branches of the DSSS_QPSK signal and quadrature component, and send the generated in-phase component and quadrature component of the two branches to the coherent integration module;

[0080] The coherent integration module integrates and accumulates the received in-phase components and quadrature components of the two branches to generate the in...

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Abstract

The invention relates to a DSSS_QPSK carrier phase quadrature error receiving and compensating system and method, and belongs to the technical field of signal processing. In allusion to a problem that the demodulation performance is degraded because direct sequence spread spectrum quadrature signals (DSSS_QPSK) adopted in the fields of navigation and communication are reduced in orthogonality, phase compensation is carried out on a carrier quadrature error at a receiving terminal, the performance loss caused by reduction in carrier orthogonality is reduced, and engineering constraints of the signal orthogonality at a transmitting terminal are reduced. The system provided by the invention can effectively reduce demodulation loss within the scope that the carrier orthogonality is reduced by 45 degrees, and demodulation performance reduction caused by long-term load running is prevented. The method provided by the invention reduces engineering constraints of the transmitting signal carrier orthogonality under the premise of not affecting the measurement and data transmission performance of the system.

Description

technical field [0001] The present invention relates to a DSSS_QPSK carrier phase quadrature error receiving compensation system and method, which belongs to the technical field of signal processing, and aims at the problem of performance loss of direct sequence spread spectrum quadrature signal (DSSS_QPSK) adopted in the field of navigation and communication due to the degradation of orthogonality The problem is to perform phase compensation on the carrier quadrature error at the receiving end, reduce the performance loss caused by the decrease of carrier orthogonality, and reduce the engineering constraints of signal orthogonality at the transmitting end. Background technique [0002] The fixed-beam inter-satellite link of Beidou II and Phase II adopts DSSS-QPSK modulation, and the orthogonal branches are used for inter-satellite high-precision measurement and high-speed data transmission. The measurement branch has a low information rate and long integration time, enablin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04B1/7087H04L27/227G01S19/37
CPCG01S19/37H04B1/707H04B1/7087H04L27/2273H04L27/2278
Inventor 张中英蒙艳松刘涛胡锦涛朱向鹏周晓平边朗邢炜郑先安
Owner XIAN INSTITUE OF SPACE RADIO TECH
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