Anti-multipath interference device of GNSS receiving system and method thereof
A technology of a receiving system and an interference device, which is applied in the field of satellite navigation, can solve the problems of limited multipath signal suppression, reduced real-time performance of multipath estimation, and difficulty in suppressing multipath signals, and achieves real-time performance and stability of multipath suppression. Conducive to precise positioning and the effect of suppressing multipath interference
Active Publication Date: 2013-03-27
BEIHANG UNIV
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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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[0038] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0039] Such as figure 1 As shown, an anti-multipath interference device of a GNSS receiving system of the present invention includes: a first multiplier 1, a second multiplier 2, a feedforward filter 3, an adder 4, a down sampler 5, a decision unit 6, and a feedback Filter 7, equalizer coefficient updater 8, code tracking loop 9, and carrier tracking loop 10. Among them, the digital intermediate frequency GNSS signal S is input to one input end of the first multiplier 1, the first output end of the carrier tracking loop 10 is connected to the other input end of the first multiplier 1, and the digital intermediate frequency GNSS signal S is input to the second One input of the multiplier 2, the second output of the carrier tracking loop 10 is connected to the other input of the second multiplier 2; the output of the first multiplier 1 ...
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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 complex signals 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 specifically relates to an anti-multipath interference device and method of a GNSS receiving system. Background technique [0002] The Global Navigation Satellite System (GNSS) has become one of the fastest growing information industries in the world. It has the characteristics of global, all-weather, continuous and real-time, and can provide users with positioning, speed measurement and timing. service. Because GNSS plays a vital role in both military and civilian use, more subsystems belonging to the GNSS system are being designed, constructed, and used. [0003] Among them, modern satellite navigation systems that use spread spectrum ranging codes, such as the Global Positioning System (GPS), Beidou II, and Global Orbiting Navigation Satellite System (GLONASS), have navigation messages in the form of data. The pseudo-random code and carrier are modulated twice to form a radio wave and then c...
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IPC IPC(8): H04B1/711H04L25/03
Inventor张晓林李春宇张展苏琳琳
OwnerBEIHANG UNIV