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Method for detecting sequence number of frame header in Chinese digital television terrestrial broadcasting

A digital TV ground and detection method technology, which is applied to color TV parts, TV system parts, TVs, etc., can solve problems such as inability to locate, poor anti-interference ability, and low GPS signal receiving power, and reduce complexity. The effect of reducing speed and calculation load

Active Publication Date: 2012-07-18
NANKAI UNIV
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Problems solved by technology

[0002] GPS (Global Positioning System, Global Positioning System) can provide high-precision positioning with global coverage, and has been applied in many fields, but its shortcomings of being unable to position indoors and between urban buildings have become increasingly obvious
This deficiency of GPS is due to the low power of GPS signal reception, reaching the ground in a vertical manner and poor anti-interference ability

Method used

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  • Method for detecting sequence number of frame header in Chinese digital television terrestrial broadcasting
  • Method for detecting sequence number of frame header in Chinese digital television terrestrial broadcasting
  • Method for detecting sequence number of frame header in Chinese digital television terrestrial broadcasting

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Embodiment Construction

[0031] The method of the present invention will be further elaborated in conjunction with the accompanying drawings and embodiments. Fig. (1) is the basic flowchart of the present invention.

[0032] The data frame of China's digital TV terrestrial broadcasting standard has a four-layer structure, as shown in Figure (2), which are daily frame, divided frame, super frame and signal frame. The daily frame repeats periodically with a natural day in the Gregorian calendar, consisting of 1440 sub-frames, and the time is 24 hours. At 00:00:00 Beijing time, the day frame is reset and a new day frame starts. A sub-frame has a duration of 1 minute and includes 480 superframes. The duration of a superframe is 125 milliseconds, and the timing of all frames is strictly symbol-synchronized with standard time. The basic unit of the data frame structure is the signal frame. The signal frame consists of two parts: frame header and frame body, as shown in Figure (3). The frame header part i...

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Abstract

The invention provides a method for detecting the sequence number of a frame header in Chinese digital television terrestrial broadcasting. Frame coarse synchronization is performed by using the structure that the frame header of a signal frame in different superframes of a signal repeatedly appears, and then the specific sequence number of the frame header is determined by using the structure that the frame header of the signal frame in one superframe is symmetrical back and forth. The sequence number of the frame header of a specific signal frame is determined from a television signal in two steps. The method can be used for calculating a pseudo-range in a positioning process which is performed by using a Chinese digital television terrestrial broadcasting system and can be also used for frame synchronization for the signal. Without generating a local performance number (PN) through a receiver, the position and the sequence number of the frame header can be accurately determined by a method of detecting related peak value for two times, so that the complexity of the system is reduced, and the calculation amount of the system is reduced. The auto-correlation of the signal is adopted, so the requirement on the receiving effect of the signal is relatively low. The method is also suitable for positioning in a region with a relatively poor television signal.

Description

technical field [0001] The invention relates to a positioning method using the Chinese digital TV terrestrial broadcast signal, and also relates to a frame synchronization method of the Chinese digital TV terrestrial broadcast signal. Background technique [0002] GPS (Global Positioning System, Global Positioning System) can provide high-precision positioning with global coverage, and has been applied in many fields, but its disadvantages of being unable to position indoors and between urban buildings have become increasingly obvious. This deficiency of GPS is due to the low receiving power of GPS signals, reaching the ground in a vertical manner and poor anti-interference ability. For this reason, it is considered to be a feasible solution to use ground signals instead of GPS satellite signals in environments such as indoors. [0003] In 2006, my country promulgated the national standard "Frame Structure, Channel Coding and Modulation of Digital TV Terrestrial Broadcastin...

Claims

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Application Information

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IPC IPC(8): H04N5/06
Inventor 吴虹张南
Owner NANKAI UNIV
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