Anti-multipath interference device of GNSS receiving system and method thereof

Abstract

The invention discloses an anti-multipath interference device of a GNSS receiving system and a method thereof. The device comprises a first multiplier, a second multiplier, a feedforward filter, an adder, a down sampler, a decision device, a feedback filter, an equalizer coefficient updating device, a code tracking loop and a carrier tracking loop. The method comprises the steps of firstly using the anti-multipath interference device for receiving digital intermediate frequency GNSS signals and carrying out down frequency conversion, then carrying out decision feedback equalization on complexsignals formed by in-phase branch signals and orthogonal branch signals, finally carrying out code tracking and carrier tracking on the signals after equalization and demodulating a navigation message. The device and the method thereof can effectively resist the impacts of multipath interference, when the multipath interference exists in a channel, the pseudo code tracking precision after introducing the method into the tracking loop is higher than the tracking precision of the typical early-late DLL loop, thereby improving the measurement precision of pseudo range and being conductive to precise positioning.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and in particular relates to an anti-multipath interference device of a GNSS receiving system and a method thereof. Background technique [0002] The Global Navigation Satellite System (GNSS for short) has become one of the fastest-growing information industries in the world. It is global, all-weather, continuous and real-time, and can provide users with positioning, speed measurement and timing services Serve. Because GNSS plays a vital role in both military and civilian applications, more subsystems belonging to the GNSS system are being designed, constructed and used. [0003] Among them, the navigation messages of modern satellite navigation systems using spread spectrum ranging codes such as the Global Positioning System (Global Positioning System, referred to as GPS), the second generation of Beidou, and the Global Orbiting Navigation Satellite System (Global Orbiting Navigation Satelli...

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Problems solved by technology

[0011] Among these methods, improving the antenna design and setting the antenna array method requires improving or adding hardware devices, which is cumbersome to implement, and it is difficult to suppress the multipath signal from above the antenna; the signal post-processing method has high computational complexity, and many need to introduce auxiliary references The observation quantity reduces the real-time performance of multipath estimation; the existing improved tracking loop method has complex hardware implementation and has limited suppression effect on small delay multipath signals

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