Calibration method for vehicle speed measuring instrument

A technology of speed measurement and calibration method, which is applied in the testing/calibration of speed/acceleration/shock measurement equipment, speed/acceleration/shock measurement, and measurement devices, etc. The vehicle speed sensor value is not accurate enough to achieve the effect of reducing frequent erasing, avoiding calibration operations, and improving reliability

Inactive Publication Date: 2007-05-02
SHANGHAI ZENITECH ELECTRONICS TECH DEV
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Problems solved by technology

[0002] Due to the increasingly mature satellite positioning technology, more and more satellite positioning and navigation technologies are used by various vehicles. The multi-path effect of radio waves brought by large buildings greatly reduces the positioning accuracy of satellites, and in severe cases, satellites cannot be positioned. The consequence is that continuous and accurate vehicle positioning cannot be provided, which affects the use of satellite navigation systems; in order to solve this problem , in the current vehicle navigation system, the combined positioning technology is widely used, that is, in addition to the use of satellite positioning, the dead reckoning algorithm is also used to measure the heading change of the vehicle according to the angular velocity sensor, the vehicle speed value measured by the speed sensor and GPS or other positioning systems. The reference position provided can be calculated with high accuracy when the s...

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  • Calibration method for vehicle speed measuring instrument
  • Calibration method for vehicle speed measuring instrument

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Embodiment Construction

[0022] The present invention will be described in detail below with reference to the drawings.

[0023] The calibration method of a vehicle-mounted speed measuring instrument as shown in Figure 1 includes the following steps:

[0024] a. GPS receiver receives GPS positioning data;

[0025] b. The instrument data obtained by the vehicle-mounted speed measuring instrument;

[0026] c. Determine whether the GPS positioning data and meter data conform to the speed calibration model:

[0027] I. If not, re-receive GPS positioning data and meter data;

[0028] II. If it does, correct the original speed factor of the measuring instrument to obtain a new speed factor and save it; the correction method is: the new speed factor is the product of the ratio of the speed change obtained by the GPS and the measuring instrument and the original speed factor ;

[0029] d. The product of this new speed factor and the instrument data is the true speed of the vehicle.

[0030] The aforementioned spe...

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Abstract

A method for calibrating vehicle speed measurer includes receiving GPS positioning data by GPS receiver and obtaining instrument data by said speed measurer, judging whether GPS positioning data and instrument data are in accordance to speed calibration model or not, revising speed factor originally set in said speed measurer to obtain new speed factor and storing it then using product of this new speed factor and instrument data as true speed of vehicle if it is or otherwise re-receiving GPS positioning data and instrument data.

Description

Technical field [0001] The invention relates to a method for calibrating a vehicle-mounted speed measuring instrument in dead reckoning for vehicle satellite positioning and navigation. Background technique [0002] Due to the increasing maturity of satellite positioning technology, more and more satellite positioning and navigation technologies are used by various vehicles. However, in practical applications, due to metropolitan viaducts, tunnels, overpasses, etc., satellite signals in many areas are poorly received, and due to urban The multi-channel effect of radio waves brought by large buildings greatly reduces the positioning accuracy of satellites. In severe cases, satellites cannot be positioned. The consequence is that they cannot provide continuous and accurate vehicle positioning, which affects the use of satellite navigation systems; in order to solve this problem In current vehicle navigation systems, combined positioning technology is commonly used, that is, in addi...

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Application Information

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IPC IPC(8): G01C25/00G01C21/00G01P21/02G01S1/02G01S5/02G01S19/07
Inventor 何铁夏继江徐亚卿
Owner SHANGHAI ZENITECH ELECTRONICS TECH DEV
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