Real-time processing method of satellite positioning signal
A real-time processing and satellite positioning technology, applied in satellite radio beacon positioning systems, positioning, and beacon systems using radio waves, etc. The effect of solving the problem of poor real-time performance and reducing the time required
Inactive Publication Date: 2008-12-10
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
View PDF0 Cites 11 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The purpose of the present invention is to provide a real-time processing method of satellite positioning signals, which can complete the acquisition, tracking and demodulation of satellite positioning signals with a very small amount of calculation, and solve the problem that the positioning signal software receiving and processing system is difficult to process in real time technical problem
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0039] The present invention will be further described below with reference to the drawings and implementation examples.
[0040] A satellite positioning signal software receiving and processing system uses a GPS radio frequency front end to obtain GPS intermediate frequency digital signals. The intermediate frequency sampling frequency of the signal is 5.714MHz. The computer is used as the software processing platform. The computer's CPU is AMD Sepron 3200+1.79GHz and the memory is 512M.
[0041] Using the method of the present invention for real-time processing, the processing flow is as follows:
[0042] (1) The processing software first generates a one-dimensional accumulation table, a two-dimensional sine / cosine table and a three-dimensional pseudo-random code table. The three tables only need to be generated once and stored as files on the computer's hard disk. When processing next time, only the three tables need to be read, and there is no need to generate them again.
[0...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a real-time processing method for a satellite positioning signal, which is that a one-dimensional accumulating table, a two-dimensional sine / cosine table and a three-dimensional pseudo-random code table are generated in advance and stored; local carriers and pseudo-random codes are obtained through the method of searching the tables when the treatment of satellite positioning signals is carried out; the bit XOR operation is used to complete the mixture of the satellite signals with the local carriers and the pseudo-random codes; the mixed results are directly input into the accumulating table; the relative results are obtained by accumulating the results which are searched in the tables; the acquisition, the tracking and the demodulation treatments are carried out according to the relative results. The real-time signal processing method uses the lookup tables and the bit operation method, the time spending on the real-time generation of the local carriers and the pseudo-random codes is saved, and the time of the relative calculations is greatly reduced; the acquisition, the tracking and the demodulation treatments of the satellite signals are completed by little calculation quantity, and the real-time signal processing method is suitable for various satellite positioning signal processing platforms which need the real-time processing.
Description
Technical field [0001] The invention belongs to the technical field of signal reception and processing for navigation and positioning, and specifically refers to a real-time processing method for GPS (Global Positioning System) satellite positioning signals. The inventive method is suitable for real-time processing and application development of software receiving systems for positioning signals on the ground, near space, airborne / satellite, etc. Background technique [0002] The satellite positioning signal uses pseudo-random codes to spread-spectrum the navigation message, and modulate the spread-spectrum message information to a high-frequency carrier in a BPSK mode. In order to obtain useful navigation information, users need to acquire, track and demodulate the received satellite signals. The core idea of these processes is to use the locally generated carrier and pseudo-random code to perform correlation operations with the received satellite signal to complete the despre...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01S1/02G01S5/02G01S19/29G01S19/30G01S19/37
Inventor 邓江平张雷王建宇舒嵘易炯
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI