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Signal detection device and method

A signal detection and signal technology, applied in the field of communication, can solve problems such as data decoding errors, achieve the effect of controlling power consumption, filtering out-of-band interference and noise, and controlling update rate

Active Publication Date: 2015-05-27
上海际浩智能科技有限公司
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Problems solved by technology

However, affected by the change of received signal strength, the demodulated signal may have false zero-crossing points at other positions. If it is misjudged as the flip point of bi-phase symbol data, it may cause errors in subsequent data decoding.

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  • Signal detection device and method
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Embodiment Construction

[0034] In the following description, numerous technical details are set forth in order to provide the reader with a better understanding of the present application. However, those of ordinary skill in the art can understand that even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the claims of the present application can be realized.

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] The core of the present invention is that the signal detection device includes: a Costas loop for coherently demodulating RDS\RBDS signals; a bit synchronization unit 220 for determining a biphase symbol data inversion point; a code phase tracking unit 224 , used for real-time detection of changes in the bit per...

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Abstract

The invention relates to the field of communication and discloses a signal detection device and method. According to the signal detection device and method disclosed by the invention, as the in-phase branch demodulation output end of a Costas loop not only is coupled with a bit synchronization device but also needs to be coupled with a code phase tracking device, the change condition of the bit cycle of bi-phase mark data is detected in real time by utilizing the code phase tracking device, and when a code phase is deviated, error correction is performed on the code phase in time so as to ensure the decoding correctness of the bi-phase mark data. The problem that a radio data system / radio broadcast data system (RDS / RBDS) signal cannot be correctly decoded because the number of sampling points of the bi-phase mark data in a unit cycle is changed because of the factors such as the stability of a transmitter crystal oscillator, a Doppler effect and the drifting of a receiver crystal oscillator is effectively solved, and therefore, the RDS / RBDS data demodulation is at a correct bit boundary position all along.

Description

technical field [0001] The invention relates to the communication field, in particular to RDS\RBDS signal detection technology. Background technique [0002] The Radio Data System ("RDS" for short) is a communication protocol issued by the European Broadcasting Union ("EBU") for the purpose of adding some digital information to FM radio stations, including station names and program types and program content, etc. Radio Broadcast Data System ("RBDS" for short) is the name of the American version of the RDS system, and there is no essential difference between the two. Therefore, the RDS signal in this application is also the RBDS signal. The RDS system usually uses the DBPSK (Differential Binary Phase Shift Keying) modulation method to transmit digital information on the 57kHz subcarrier. If the FM broadcast transmits a stereo signal (Stereo Signal), there is a pilot signal (Pilot signal) at 19kHz, and the RDS subcarrier signal of 57kHz can be recovered by triple frequency o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/227H04L27/22
Inventor 黄威庄嘉宜汤江逊龚建
Owner 上海际浩智能科技有限公司
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