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A l2p(y) signal tracking method with high w-code adaptability

A signal tracking and adaptive technology, applied in the field of GPS dual-frequency tracking, can solve problems such as Z tracking signal processing loss, and achieve the effect of ensuring stable work

Active Publication Date: 2021-04-13
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0008] The technical solution problem of the present invention is: overcome the deficiencies in the prior art, provide a kind of L2P (Y) signal tracking method of high W code adaptability, needn't estimate W code code rate, have avoided due to the inaccurate estimation of W code code rate The Z-tracking signal processing loss problem brought about by

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  • A l2p(y) signal tracking method with high w-code adaptability

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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0036] Such as figure 1 Shown, the steps of the present invention are as follows:

[0037] (1) The receiver captures and tracks the GPS L1C / A code on the digitized GPS L1P(Y) intermediate frequency signal, thereby obtaining the accurate carrier frequency of the L1P(Y) intermediate frequency signal and the code phase information of the L1P(Y) intermediate frequency signal;

[0038] (2) Since the carrier phase of the L1C / A code is orthogonal to the carrier phase of the L1P(Y) code, the carrier of the digitized GPS L1P(Y) intermediate frequency signal is stripped according to the tracking results of the L1C / A code;

[0039] (3) Since the code phase of the L1C / A code is consistent with the code phase of the L1P(Y) code, the L1P code is generated according to the tracking result of the L1C / A code, and multiplied with the GPS L1P(Y) intermediate fr...

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Abstract

A kind of L2P (Y) signal tracking method with high W code adaptability, the receiver first strips off the carrier and the spreading code of the GPS L1P (Y) intermediate frequency signal; W code; then strip the carrier and spreading code of the GPS L2P (Y) intermediate frequency signal, and obtain the W code modulated on the GPS L2P (Y) intermediate frequency signal through the second low-pass filter; two W codes can be multiplied to remove W code to obtain the carrier residual of the GPS L2P (Y) intermediate frequency signal; after the phase-locked loop and VCO, the carrier of the recovered GPS L2P (Y) intermediate frequency signal is obtained to realize phase tracking. The invention does not need to estimate the code rate of the W code, but only needs to use the public information in the ICD file to realize the tracking, and avoids the problem of Z tracking signal processing loss caused by the inaccurate estimation of the code rate of the W code.

Description

technical field [0001] The invention relates to a high W code adaptability L2P (Y) signal tracking method, which belongs to the field of GPS dual-frequency tracking. Background technique [0002] In order to achieve high-precision positioning, GPS receivers need to receive dual-frequency signals to achieve navigation and positioning. The most widely used GPS dual-frequency signals are L1C / A code and L2P(Y) code dual-frequency GPS receivers. [0003] GPS satellites transmit navigation signals on two independent carriers L1 and L2 at the same time. The frequencies are 1575.42MHz and 1227.60MHz respectively. The L1 frequency is modulated by two PRN codes, C / A code and P(Y), and the carrier phases are orthogonal. The L2 frequency only modulates the P(Y) code signal. In order to achieve the purpose of confidentiality, the Y code is generated by the XOR of the P code (code type disclosure period is 7 days, code rate 10.23MHz) and W code (code type unknown, no cycle, code rate abo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/30G01S19/29
CPCG01S19/29G01S19/30
Inventor 王延光曲博韩星远张蓬李龙龙韩琳
Owner XIAN INSTITUE OF SPACE RADIO TECH