Weak GNSS signal differential coherent accumulative capturing method
A coherent accumulation and differential technology, applied in the field of weak GNSS signal capture, can solve the problem of long square loss of weak GNSS signal capture time, and achieve the effect of large gain, improved performance and reduced capture time
Inactive Publication Date: 2011-09-21
HARBIN INST OF TECH
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0011] The purpose of the present invention is to solve the problem that the existing half-bit method and full-bit method have a long acquisition time for weak GNSS signals and there is a square loss caused by non-coherent accumulation, thereby proposing a differential coherent accumulation acquisition method for weak GNSS signals
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
specific Embodiment approach 1
[0022] Embodiment 1: Combining image 3 and Figure 10 ~ Figure 13 This specific embodiment will be described. A differential coherent accumulation acquisition method for weak GNSS signals described in this embodiment, it is completed by the following steps:
[0023] Step 1. Divide the received navigation data into 4 data groups, and then divide the data in each data group into M+1 data blocks. The data length of each data block is 20ms; for the obtained data structure, see Figure 10 shown;
[0024] Step 2: Perform coherent accumulation on the M+1 data blocks in each data group to obtain M+1 coherent accumulation matrices; for the obtained data structure, see Figure 11 shown;
[0025] Step 3: Perform conjugate product on the coherent accumulation matrix of every two adjacent data blocks in each data group to obtain M difference matrices; for the obtained data structure, see Figure 12 shown;
[0026] Step 4. Multiply the navigation data bit product combinations corresp...
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 weak GNSS signal differential coherent accumulative capturing method, relating to a capturing method for weak GNSS signals. The method solves the problem of square loss caused by non-coherent accumulation and long GNSS signal capturing time of the existing half Bitter method and full Bitter method. The method of the invention is characterized in that received data is divided into four groups, and data in each group is divided into M+1 data blocks; each data block in each data group is respectively accumulated coherently, and conjugation product is preformed to coherent accumulative matrix of every two adjacent data blocks in each data group; product combinations of navigation data bit corresponding to all adjacent data blocks in each data group are multiplied withM differential matrices in the group to acquire the accumulation results of the group; four groups of maximum values of differential accumulation results are taken as the capturing results, and the initial position of each data group is corresponding to one estimated bit edge. The invention is suitable for weak signal capturing process of GPS.
Description
technical field [0001] The invention relates to a method for capturing weak GNSS signals. Background technique [0002] Global Navigation Satellite System (GNSS) is a global position and time determination system, which includes satellite constellation, ground monitoring system and user terminal equipment, which can provide all-weather, real-time, High-precision three-dimensional position, speed and precise time information. The GPS system in the United States, the Galileo system in Europe, and the GLONASS system in Russia are all types of GNSS. Take the GPS signal in the United States as an example: under the condition of a wide field of vision, the power of the GPS signal is about -130dBm. At this time, the signal power received by the receiver can guarantee its normal operation. However, in complex environments such as indoors, mountains, forests, and cities, the GPS signal power drops to -150dBm, which will affect the user's positioning. [0003] In a weak signal envi...
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 Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02
Inventor 韩帅谢松王文静孟维晓张中兆
Owner HARBIN INST OF TECH