Temperature compensation-based system time delay error correction method

Abstract

The invention relates to a temperature compensation-based system time delay error correction method. According to the temperature compensation-based system time delay error correction method, a temperature measuring point is set in a precise ranging product, and temperature telemetry is acquired; temperature-pseudo range measurement is performed on the product, so that a priori value can be obtained; an n-order polynomial regression model is established to perform fitting residual analysis; when residual precision is compressed or is smaller than a predetermined threshold value with the increase of the order, the order which appears at the compression point of the residual precision or when the residual precision is smaller than the predetermined threshold value is adopted as the order of the polynomial regression model; the time delay correction coefficient of the n-order polynomial regression model is estimated according to the minimum root-mean-square criterion; and time delay correction is carried out under the temperature of the precise ranging product according to the time delay correction coefficient and the temperature telemetry which is acquired in real time. According to the temperature compensation-based system time delay error correction method of the invention, temperature telemetry acquisition is additionally realized on the product, and is adopted as a correction input factor, and therefore, ranging system errors caused by temperature change of the precise ranging product can be effectively solved. The correction method is simple and reliable and only occupies a small quantity of resources on the whole.

Description

technical field [0001] The present invention relates to a method for correcting system time delay error, in particular to a method for correcting system time delay measurement of space-borne products with high requirements under the condition of wide range of working temperature changes, by adding temperature telemetry acquisition on product hardware as Correcting the input value corrects the ranging system error caused by temperature changes in precision ranging products, and achieves the purpose of engineering satellite navigation receivers, which belongs to the field of precision ranging. Background technique [0002] Inter-satellite precision ranging products, as the core stand-alone of the precision ranging system, receive spread spectrum ranging signals for precise measurement of pseudo-range. In order to ensure the accuracy of the precision ranging system, the system delay change of pseudo-range is required to be less than 0.5ns. During the entire life cycle of a sate...

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Problems solved by technology

[0007] In the product design, the active equipment of the ranging system is selected as an inert device with a small temperature delay with the temperature change. In addition, in the establishment of the measurement system, the temperature control is carried out for the equipment with a large time delay with the temperature change, and the exposed external equipment cannot be temperature controlled. (Passive equipment) Select equipment with a small coefficient of time delay variation with temperature. The main disadvantage of this method is that special temperature control measures need to be taken for equipment with a large time delay variation with temperature in the system, and temperature control cannot be performed for exposed external equipment. During product design, it is necessary to screen the device temperature characteristics of the product, which restricts the range of product device selection and increases the complexity and difficulty of product design.

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