FLL and subcarrier loop united frequency discrimination tracking loop

A technology of carrier tracking loop and tracking loop, which is applied in the field of satellite navigation and tracking, and can solve the problems of phase detection error flooding and high ambiguity of phase detection results, etc.

Active Publication Date: 2014-02-05
TIANJIN 712 COMM & BROADCASTING CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In 2010, Beihang University applied for a patent called a binary offset carrier signal tracking loop, which introduced a subcarrier tracking loop to eliminate the problem of BOC signal ambiguity. However, the two-quadrant arctangent phase

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  • FLL and subcarrier loop united frequency discrimination tracking loop
  • FLL and subcarrier loop united frequency discrimination tracking loop
  • FLL and subcarrier loop united frequency discrimination tracking loop

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] The present invention is a frequency-locked loop and sub-carrier joint frequency discrimination tracking loop, such as figure 1 As shown, it includes carrier tracking loop 01, subcarrier tracking loop 02 and spreading code tracking loop 03.

[0040] The carrier tracking loop 01 includes a carrier loop numerically controlled oscillator 102, a cross-correlation processing unit 101, an integral clearing unit 111, a carrier loop discriminator 107 and an FLL loop filter 110;

[0041] The subcarrier tracking loop 02 includes a subcarrier numerically controlled oscillator 103, a cross-correlation processing unit 101, an integral clearing unit 111, a subcarrier loop phase detector 106 and an SLL loop filter 109;

[0042] The spread code tracking loop 03 includes a spread code numerically controlled oscillator 104 , a cross-correlation processing unit 101 , an...

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Abstract

The invention provides an FLL and subcarrier ring united frequency discrimination tracking loop which comprises a carrier tracking loop, a subcarrier tracking loop and a spreading code tracking loop. The carrier tracking loop comprises a carrier numerically-controlled oscillator, a mutual correlation processing unit, integral zero clearing units, a carrier loop frequency discriminator and an FLL loop filter. The subcarrier tracking loop comprises a subcarrier numerically-controlled oscillator, a mutual correlation processing unit, integral zero clearing units, a subcarrier loop phase discriminator and an SLL loop filter. The spreading code tracking loop comprises a numerically-controlled oscillator, a mutual correlation processing unit, integral zero clearing units, a code loop phase discriminator and a DLL loop filter. According to the structural characteristics of BOC signals, the FLL and subcarrier ring united frequency discrimination tracking loop can achieve independent tracking of the carrier frequency, the subcarrier phase and the spreading code phase, the tracking stability performance of weak signals is improved, the dynamic range of the loop is increased, and the problem of tracking ambiguity of the BOC signals under the low signal to noise ratio can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation and tracking, in particular to a combined frequency discrimination and tracking loop of a frequency-locked loop and a subcarrier loop for BOC modulation signals. Background technique [0002] With the continuous development of satellite navigation technology, the satellite navigation systems of various countries have made great progress. Advances in the Global Navigation Satellite System (GNSS) are first and foremost advances in GPS modernization. On the basis of the existing satellite signals, the new generation of GPS satellite signals has been improved in many aspects such as modulation mechanism, pseudo code sequence form and carrier frequency band. Binary Offset Carrier Modulation (BOC) is a modulation method commonly used in future military GPS signals. The unique power spectrum splitting characteristic of the BOC modulation method can achieve frequency band sharing and spectr...

Claims

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Application Information

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IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/29G01S19/30
Inventor 张洪伟王祥峰马俊峰常亮李云娜
Owner TIANJIN 712 COMM & BROADCASTING CO LTD
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