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Method and device for tracking global positioning system precision (GPS P) and/or Y code signal of full-cycle carrier

A code signal and P-code technology, applied in measuring devices, radio wave measurement systems, satellite radio beacon positioning systems, etc., can solve problems such as increasing half-circle ambiguity, difficulty in fast ambiguity resolution, and decrease in loop signal-to-noise ratio

Active Publication Date: 2011-07-06
UNICORE COMM INC
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Problems solved by technology

The disadvantages of this method are: the output frequency is 2 times the original carrier frequency after squaring, the wavelength is halved, and the half-cycle ambiguity is increased, which makes it difficult to solve the ambiguity quickly; the squaring also causes more noise to enter the receiver, and the loop signal decrease in noise ratio
The disadvantage of this method is: in order to align the P(Y) codes on L1 and L2, the L2 delay must be variable; because this method is still processed under the spread spectrum bandwidth, the signal-to-noise ratio is low
However, the timing relationship of the W bit relative to the P code phase must be obtained by relying on a high-gain antenna, which is not realistic in practical applications

Method used

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  • Method and device for tracking global positioning system precision (GPS P) and/or Y code signal of full-cycle carrier
  • Method and device for tracking global positioning system precision (GPS P) and/or Y code signal of full-cycle carrier
  • Method and device for tracking global positioning system precision (GPS P) and/or Y code signal of full-cycle carrier

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Embodiment 1

[0115] Embodiment one, a kind of tracking method of GPSP and / or Y code signal of the whole week carrier, comprising:

[0116] A. Guided by the C / A code of the L1 satellite signal to generate a local P code;

[0117] B, L1, and L2 satellite signals are respectively correlated with the local P codes, and the correlation results are accumulated once with a length of 1 Wbit, crossed and multiplied, and then accumulated twice to obtain the second times of the L1, L2 satellite signals accumulated results;

[0118] C. Tracking the code loop and carrier loop of the L1 and L2 satellite signals according to the secondary accumulation results of the L1 and L2 satellite signals, that is, tracking the code phase and carrier phase.

[0119] The tracking of the L2 satellite signal realizes the tracking of the Y code or the P code.

[0120] In the present embodiment, in the step B, the I and Q two-way signals after the down-conversion of the L1 and L2 satellite signals are respectively corr...

Embodiment 2

[0159] Embodiment two, a kind of tracking device of GPSP and / or Y code signal of whole week carrier, such as figure 2 shown, including:

[0160] The P code generation module is used for guiding by the C / A code of the L1 satellite signal to generate a local P code;

[0161] The first and second correlators are respectively used to correlate the L1 and L2 satellite signals with the local P code to obtain the first and second correlation results;

[0162] The W code auxiliary module is used to perform an accumulation of 1 Wbit length on the first and second correlation results respectively and cross-multiply them, and then perform secondary accumulation respectively to obtain the secondary accumulation results of the L1 and L2 satellite signals;

[0163] The loop tracking module is used to track the code loop and the carrier loop of the L1 and L2 satellite signals according to the secondary accumulation results of the L1 and L2 satellite signals.

[0164] To realize the tracki...

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Abstract

The invention provides a method and a device for tracking a global positioning system precision (GPS P) and / or Y code signal of a full-cycle carrier. The method comprises the following steps of: generating a local P code through coarse / acquisition (C / A) code guide of an L1 satellite signal; correlating the L1 satellite signal and an L2 satellite signal to the local P code respectively; performingprimary accumulation with W bit length on the correlation result, multiplying in a crossed way, and then performing secondary accumulation to obtain secondary accumulation results of the L1 satellitesignal and the L2 satellite signal respectively; and tracking a code ring and a carrier ring of the L1 satellite signal and the L2 satellite signal according to the secondary accumulation results of the L1 satellite signal and the L2 satellite signal. By the method and the device, full-wavelength restoration of the carrier can be realized on the L2; and higher signal-to-noise ratio is achieved.

Description

technical field [0001] The present invention relates to the field of navigation, in particular to a method and device for tracking GPSP and / or Y code signals of a whole cycle carrier. Background technique [0002] GPS satellites simultaneously transmit L1 and L2 two-way spread spectrum signals. The carriers are 1575.42MHz and 1227.6MHz respectively. The L1 signal spreads the navigation message with C / A code and P code respectively, and the L2 carrier only uses the P code to carry out the navigation message. spread spectrum. For security reasons, the U.S. military has formulated the AS (anti-spoofing) policy, that is, using the strictly confidential W code and P code modulo two to form a Y code and then performing spread spectrum modulation on the navigation message, so that ordinary users are not allowed Directly use the dual-frequency working mode. Dual-frequency carrier-phase measurements are important for surveying and mapping applications; dual-frequency pseudoranges a...

Claims

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Application Information

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IPC IPC(8): G01S19/30G01S19/32
Inventor 高庆余王博莫钧韩绍伟
Owner UNICORE COMM INC
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