Dynamic loop tracking method and device suitable for rotating shell

Abstract

The invention discloses a dynamic loop tracking method and device suitable for a rotating shell. The method comprises the steps of adding a rotating speed estimation unit in a receiver loop, carrying out Kalman filtering by using the loop tracking original information, obtaining a pitch angle and an azimuth angle of a satellite incident direction, and calculating a Doppler error estimation value caused by the antenna phase center deviation by combining the phase center deviation estimated on the ground; and compensating to a code frequency and a carrier frequency of a tracking loop so as to realize the error compensation of rotation modulation. The method is high in ground operability, is simple in algorithm application, is free of complex equations or large in operand, and is capable of guaranteeing the algorithm programming implementation on a DSP or FPGA hardware platform at the aspects of real-time performance and operand, namely, the engineering implementation is easy.

Description

technical field [0001] The invention belongs to the field of satellite navigation information processing and relates to a dynamic loop tracking method for a satellite navigation receiver suitable for rotating cannonballs. Background technique [0002] Due to its small size and low cost, the satellite navigation receiver has become a commonly used navigation device for rotating projectiles. During the flight of the projectile, there is superposition of axial and tangential motion of the projectile. When traditional satellite navigation receivers are applied to projectiles, they face many problems. The main problems are as follows: 1) Signal occlusion caused by projectile rotation; 2) Velocity error caused by tangential motion caused by rotation; 3) Dynamic adaptability during rotation Question; 4) Rotation modulation effect on signal phase. [0003] At present, the main technical means to solve problems 1) to 2) is the dual-antenna synthesis method, that is, two conformal a...

AI Technical Summary

Problems solved by technology

The former can overcome the loop loss caused by large axial dynamics, and at the same time ensure a certain tracking accuracy, but it is easily affected by the speed of the projectile, and the loop stability and adaptability are poor; the latter has a simple loop structure and dynamic adaptability. Good performance, but poor tracking accuracy

The main method to solve problem 4) is to predict the rotational speed of the projectile through the geomagnetic sensor or single-antenna satellite reception, and perform error compensation for the rotation modulation effect. However, there are many restrictive factors in the use of geomagnetic measurement, and the maintenance process is complicated. The algorithm is complex and subject to many constraints

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