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Method for determining full round number funiness of radio guidance system

A technology of wireless navigation and determination method, which is applied in the field of high-precision navigation and positioning systems, and can solve the problems of low reliability, inability to completely eliminate the ambiguity of the integer number of cycles, and increasing the complexity of the transmitter and receiver.

Inactive Publication Date: 2007-08-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

However, the actual phase measurement can only determine the fractional part of a week, and the whole number N 0 is not clear
Each of these methods has its own disadvantages. The reliability of method 1 is not high. Once the signal is lost or the device is temporarily powered off, the accuracy of the complete phase cycle count will be destroyed. At this time, the ambiguity of the complete cycle number cannot be completely eliminated.
Using method 2 increases the complexity of the transmitter and receiver, thereby increasing the difficulty of implementation and system cost

Method used

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  • Method for determining full round number funiness of radio guidance system
  • Method for determining full round number funiness of radio guidance system
  • Method for determining full round number funiness of radio guidance system

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Embodiment Construction

[0045] Suppose the code length of the spreading code is N c (chip)=8191, the coding rate of spreading code is K=25 (kchip / s), carrier frequency is f=2 (MHz), and electromagnetic wave propagation speed is C=3*10 8 (m / s), the accuracy of the receiver to capture and track the spreading code is Δφ 1 =0.01(chip), at this time, formula (4) is established. Then the distance required to propagate a complete spreading code is R = N c C K = 98292 ( km ) , Now suppose the measured The distance r is less than 98292 (km). After spread spectrum modulation, the transmitting station transmits the signal required for measurement, and after a certain distance of propagation, determine the number of integer cycles N 0 The steps are as follows:

[0046] Step 1: After the received signal i...

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Abstract

The invention discloses a new method to eliminate full carrier wave phase change complete circumference number ambiguity, within a certain distance, it uses local reception spread spectrum code phase capture and tailing result and the carrier wave phase changing value which is accepted by reception, bases on the relation of spread spectrum code and carrier wave transmitting distance, to get the carrier wave phase change complete circumference number ambiguity. The invention does not need extra assistant signal, and also does not need improve system complication, the invention can achieve carrier high precision measure orientation rapidly, conveniently and reliably, it can be used in high precision navigation and orientation system.

Description

technical field [0001] The invention belongs to the field of using electromagnetic wave technology for navigation and positioning, such as in wireless navigation systems, and particularly relates to a system for high-precision navigation and positioning using carrier phase measurement. Background technique [0002] As we all know, in the existing navigation and positioning system, multiple transmitters are widely used to transmit navigation and positioning signals, and the receiver receives them; the receiver calculates its own position according to the electrical parameters of the navigation and positioning signals received from each transmitter. One principle to locate and navigate. In order for the receiver to determine which transmitting station the received signal comes from, the transmitting station usually uses CDMA spread spectrum technology. And because the carrier frequency is high and the wavelength is short, in order to improve the accuracy of navigation and pos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02G01S19/29G01S19/30
Inventor 唐友喜赵宏志潘文生
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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