High-sensitivity capturing method and device of satellite navigation receiver

Abstract

The invention discloses a high-sensitivity capturing method and device of a satellite navigation receiver, and relates to the field of signal processing. The device comprises the steps that a composite GNSS signal is multiplied with a local carrier of a GNSS receiver and multiplied with the data component and pilot frequency component of a local pseudocode of the GNSS receiver sequentially to perform integral operation; correlation outputs of an in-phase branch and orthogonal branch of a data channel are combined to form a multiple correlation output of the data channel, and correlation outputs of the in-phase branch and orthogonal branch of a pilot frequency channel are obtained to form a multiple correlation output of the pilot frequency channel. The method has the advantages that the capturing sensitivity of the GNSS receiver can be significantly improved from performance indicators of false-alarm possibility, detecting possibility and the like, the capturing performance improvementcan be achieved by a joint data channel and pilot frequency channel differential combined strategy compared with a traditional single-channel capturing technology, and the capturing sensitivity of the GNSS receiver in a weak signal environment is significantly improved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a high-sensitivity acquisition method and device for a satellite navigation receiver. Background technique [0002] The new composite GNSS signal contains a data channel and a pilot channel. In capturing the new composite GNSS signal, in order to avoid the problem of data symbol flipping, the existing conventional method is to use a single-channel acquisition technology, such as figure 1 As shown, the pilot channel is used alone. The new GNSS signal data channel and pilot channel components experience the same transmission environment, so they are affected by the same code phase delay and Doppler shift, and the carrier phase difference is strictly maintained at 180°. If only a single pilot channel is used, the disadvantage is that the power transmitted by the navigation satellite will be lost by half; when capturing weak GNSS signals, if the data channel is ignored and...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-sensitivity acquisition method for satellite navigation receivers, which uses a multi-channel differential coherent combination strategy for composite GNSS signals to solve the problem of channel power loss that cannot be solved in the prior art, and the resulting GNSS receiver in The problem of not working properly in a weak signal environment

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