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Method for filtering ineffective drift signal of global positioning system (GPS) equipment

A technology of GPS equipment and GPS signals, applied in satellite radio beacon positioning systems, radio wave measurement systems, measuring devices, etc., can solve the problems of invalid positioning information, irregular drift points, etc., and achieve the effect of ensuring the trajectory

Active Publication Date: 2011-09-14
WUHAN ZHONGHAITING DATA TECH CO LTD
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0013] 3. When the positioning is invalid, there is no special information in the transmitted NMEA-0183 protocol to indicate that the positioning information is invalid
[0019] 4. If you smooth and filter according to the trajectory, many invalid drift points will be retained, because some drift points are not irregular, and they look like normal paths from the shape of the trajectory

Method used

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  • Method for filtering ineffective drift signal of global positioning system (GPS) equipment
  • Method for filtering ineffective drift signal of global positioning system (GPS) equipment
  • Method for filtering ineffective drift signal of global positioning system (GPS) equipment

Examples

Experimental program
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Embodiment

[0073] When the commonly used vehicle-mounted GPS equipment performs invalid drift filtering, the minimum movement speed of the equipment under normal conditions can be set to 5 meters per second. When the GPS acquisition frequency is 1 time per second, the basic distance is 5 meters.

[0074] 1. Establish a buffer zone with continuous GPS points collected within two minutes, and the number of points in the buffer zone is 120 points.

[0075] 2. Set 3D positioning and GPS points with a speed greater than 5 m / s as normal signal points, and the remaining points are collected according to continuity.

[0076] 3. Perform cyclic processing on a plurality of continuous marking point segments, and the processing steps are 4-6.

[0077] 4. When calculating point density, a buffer zone is established with a radius of 8 times the basic distance, that is, 40 meters. When the distance between the maximum density point and the previous fixed point is less than the diameter of the buffer zo...

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Abstract

The invention provides a method for filtering an ineffective drift signal of global positioning system (GPS) equipment. The method comprises the following steps of: recognizing and filtering an ineffective drift signal point produced by the static GPS equipment at first when an indoor signal or an outdoor signal is different; and then correctly recognizing an ineffective drift point without deleting normal trace points of a satellite signal difference by mistake by comprehensively using the GPS signal weakness and a space analysis result. By the method, the effectiveness of the GPS signal canbe determined accurately on a software layer; and ineffective positioning points can be filtered out to the maximum extent on the basis of guaranteeing the completeness of the normal trace.

Description

technical field [0001] The invention belongs to a GPS (global positioning system) equipment signal filtering algorithm, and specifically relates to how to correctly identify and filter invalid information during the use of the GPS equipment. The invalid information includes incorrect drift positioning information in an indoor or outdoor static state. It has application value in GPS equipment monitoring system. Background technique [0002] The GPS devices utilize an American satellite system developed for military purposes. We use receivers on the ground to receive coordinate data from satellites. The receiving device communicates with these satellites to determine where the receiver is located and calculate longitude, latitude, and even altitude. With constant communication with the satellite, the receiver is able to collect data within a set time and calculate speed, distance and estimated time to reach a preset point. [0003] The NMEA-0183 protocol is a standard proto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/37
Inventor 罗跃军
Owner WUHAN ZHONGHAITING DATA TECH CO LTD
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