A Comprehensive Calculation Method of Pseudo-Satellite Array Antenna Pattern for Weakening Near-Far Effect
A technology of pattern synthesis and array antenna, which is applied in satellite radio beacon positioning system, radio wave measurement system, instrument, etc., can solve the problems of complex processing process, too strong signal power, and the inability of the receiver to process pseudolite signals, etc. To achieve the effect of overcoming the near-far effect
Active Publication Date: 2019-10-01
交信北斗(浙江)科技有限公司
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The first three methods all need to change the signal structure or add hardware equipment. The fourth method does not need to change the hardware equipment, but needs to reconstruct the strong signal, that is, accurately reproduce the amplitude, carrier frequency, code phase and initial carrier phase of the received signal. , the process is more complex
[0004] For the positioning system where the pseudolite is erected on the ground, when the receiver is close to the satellite, the signal power is too strong to cause the receiver's radio frequency channel to be saturated, the receiver cannot process the pseudolite signal, and the pseudolite system loses its role in auxiliary positioning
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
[0022] The embodiments will be described in detail below in conjunction with the accompanying drawings.
[0023] consider as figure 1 In the situation shown, the coverage of the antenna is about 500km, and the effective coverage of the signal is required to be in the CA part and the OB part, and the OC part may not be considered. The target orientation map can be calculated, as shown in Figure 2. In order to make the array antenna reach the target pattern, it is necessary to adjust the amplitude and phase of each array element to make the pattern function approach the target pattern, which is a complex optimization and fitting problem. The invention proposes a pseudo-satellite array antenna pattern synthesis algorithm for weakening the near-far effect.
[0024] The specific steps of the algorithm are as follows:
[0025] The first step: initialization. Set the acceleration factor c 1 and c 2 and the maximum number of evolution iterations T MAX The size of the definition...
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 belongs to the technical field of antenna and signal propagation and especially relates to a pseudo-satellite array antenna directional pattern comprehensive algorithm for weakening a near-far effect. The comprehensive algorithm comprises steps of: determining the effective coverage area of a signal according to the coverage area of a form-giving transmitting antenna and computing a target directional pattern; using an array antenna as an array containing n array elements and n weights required to be solved, and using m particles as a population, wherein each particle is a weight solution; and adjusting the amplitude and the phase of each particle by using particle swarm optimization in order to enable a directional pattern function to approximate the target directional pattern. The pseudo-satellite array antenna directional pattern comprehensive algorithm uses an inertia factor based on a statistical theory, overcomes disadvantages of slow convergence speed and local optimum proneness of conventional particle swarm optimization, uses the improved particle swarm optimization for fitting the target directional pattern in order to overcome the near-far effect of a pseudo-satellite system.
Description
technical field [0001] The invention belongs to the technical field of antennas and signal propagation, and in particular relates to a method for comprehensively calculating the pattern of a pseudolite array antenna for weakening the near-far effect. Background technique [0002] The use of pseudolite-assisted positioning can increase the number of visible stars in the satellite navigation system, significantly improve the positioning precision (DOP), and improve the positioning accuracy of the system. In environments where GPS signals cannot be received, such as indoors, mines, underground parking lots, etc., by using more than 4 pseudolites to form an independent navigation and positioning system, small-scale navigation and positioning can be performed, so pseudolite positioning has a wide range of applications prospect. However, compared with the real GPS navigation system, the distance between the pseudolite and the receiver is much closer, and the relative distance of ...
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): G01S19/24G01S19/21
Inventor 刘建沈兵李晶于渊卢红洋陈献国
Owner 交信北斗(浙江)科技有限公司