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Intelligent despreading and demodulation method and device for navigation associated multiplexing signals in shared frequency band

A technology of multiplexing signals and demodulation methods, which is applied in the fields of broadcasting, navigation, and communication. It can solve problems such as signal strength fading, satellite navigation signal occlusion, and signal distortion, and achieve increased navigation and positioning information rate, reduced spread spectrum gain requirements, The effect of reducing bandwidth

Active Publication Date: 2018-02-06
施浒立
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned invention patent applications are difficult to solve the problem of satellite navigation system transmission in the city's high-rise buildings, high mountains, deep canyons, and deep forests, resulting in satellite navigation signals being blocked and signal strength being significantly reduced, affecting navigation and positioning Effect
[0007] Especially in the indoor environment, it is difficult for the signal of the satellite navigation system to enter the room directly, and the signal strength will be significantly attenuated, the signal is very disordered, and the signal will even be distorted. It is difficult to meet the insurmountable technical problems such as indoor positioning.

Method used

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  • Intelligent despreading and demodulation method and device for navigation associated multiplexing signals in shared frequency band
  • Intelligent despreading and demodulation method and device for navigation associated multiplexing signals in shared frequency band
  • Intelligent despreading and demodulation method and device for navigation associated multiplexing signals in shared frequency band

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] The implementation scheme of the universal accompanying navigation and positioning signal system based on the CMMB broadcast signal system:

[0090] The schematic diagram of CMMB broadcast signal frame structure is as follows: Image 6 As shown, the pilot frame is 1 frame per second, and each frame is divided into 40 time slots, and the duration of each time slot is 25ms, including the beacon information of the frame header part and 53 OFDM symbols of the service data part. The beacon signal structure subframes in which are also shown in Image 6 , the subframe of the beacon signal structure includes a transmitter identification (TxID) and two identical synchronization signals.

[0091] The structure of the spread-spectrum accompanying navigation and positioning signal is as follows: Figure 7 As shown, it consists of positioning information and spreading codes. The positioning information includes the three-dimensional position coordinate information and time inform...

example 2

[0109] On the basis of the universal accompanying navigation and positioning signal generated by the sending end, the receiving end adopts the SHL intelligent demodulation technology suitable for this signal system for receiving processing, such as figure 1 As shown, the specific implementation steps are as follows:

[0110] 1. Pass figure 2 The receiving antenna in the receiving signal;

[0111] 2. The signal is amplified by a low noise amplifier;

[0112] 3. After down-conversion, it is converted into an intermediate frequency signal;

[0113] 4. The intermediate frequency signal is divided into two paths through the splitter;

[0114] 5. Perform analog-to-digital conversion on the two-way signal through the analog-to-digital sampling chip;

[0115] 6. Demodulate one of the channels in normal OFDM mode;

[0116] 7. Decode and output CMMB message;

[0117] 8. Pass figure 2 The background noise remover in the method performs denoising processing on the other channel, ...

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Abstract

The invention relates to frequency-band-sharing navigation accompanying multiplexing signals, and an intelligent despreading demodulation method and a device used thereby. The method specifically includes the following steps: generating a parasitized signal telegraph text and a parasitic navigation timing telegraph text; modulating parasitized signals and parasitic signals to an intermediate frequency or a radio frequency; and carrying out power control on the parasitic signals, and the like. The intelligent despreading demodulation device includes a parasitic signal generation module, a positioning stamp signal generation module and an intermediate frequency or radio frequency combiner module and the like. Beneficial effects of the method and the device are that the method which realizes pseudo-range measurement and positioning through accompanying navigation positioning signals on a communication broadcast channel uses a pseudo random-code spectrum-spread technology and uses spectrum spread gain to compensate for a condition of low-power parasitism of the accompanying navigation positioning signals. On the premise that parasitized communication broadcast signals are not affected, pseudo distance measurement and positioning can be realized through use of the accompanying navigation positioning signals; and the accompanying navigation positioning signals of pseudo code spectrum spread is elusive and interference resisting.

Description

technical field [0001] The invention relates to the fields of communication, broadcasting and navigation, and relates to a method and a device for realizing positioning and navigation by using communication or broadcasting channels. Background technique [0002] At present, satellite navigation systems have been widely used in outdoor navigation, positioning and timing. However, in urban streets, high-rise buildings, high mountains, deep canyons, and deep forests, satellite navigation signals will be blocked, and the signal strength will be significantly reduced. , thus affecting the effect of navigation positioning. Especially in the indoor environment, it is difficult for the signal of the satellite navigation system to enter the room directly. Even if the signal enters the room after reflection or diffraction, the signal strength will be obviously attenuated, the signal is very disordered, and even the signal will be distorted, which is difficult to meet. Indoor position...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707G01S19/30G01S19/27
Inventor 施浒立张杰尚俊娜胡正群何瑞珠
Owner 施浒立
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