Precise tracking and measuring method of high dynamic signal of air fleet link

A measurement method and precision tracking technology, which is applied in the field of aviation data link and radio navigation, and can solve the problems of continuous carrier phase measurement difficulty, distance measurement, speed measurement error increase, and integration Doppler measurement difficulty.

Inactive Publication Date: 2011-09-21
CENT FOR SPACE SCI & APPLIED RES
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Problems solved by technology

[0003] ①Under the suppressed carrier communication system, the highly dynamic relative motion between the sender and the receiver causes difficulty in capture and tracking and frequent loss of lock and loss of capture;
[0004] ② High dynamics lead to increased carrier tracking error, difficulty in accurate phase alignment of regenerated pseudo codes, and increased ranging and speed measurement errors;
[0005] ③The probability of loss of lock and loss of capture will be greatly increased, which will lead to difficulties in continuous carrier phase measurement and integrated Doppler measurement

Method used

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  • Precise tracking and measuring method of high dynamic signal of air fleet link
  • Precise tracking and measuring method of high dynamic signal of air fleet link
  • Precise tracking and measuring method of high dynamic signal of air fleet link

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Embodiment Construction

[0111] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0112] figure 1 The structure diagram of carrier tracking and code tracking loop algorithm of cluster link asynchronous communication and measuring terminal is given in the method of the present invention.

[0113] Because the influence of the Doppler frequency shift introduced by the carrier dynamics on the pseudo-code tracking loop can be eliminated by carrier assistance, the dynamic performance of the receiver mainly depends on the carrier tracking technology. There are usually two tracking loops that can be used: one is a coherent phase-locked loop (PLL) (costas loop is one of them, but it is not sensitive to the modulation data on the carrier), the receiver needs to generate The coherent carrier with the same frequency and phase; the other is the non-coherent frequency phase-locked loop (FLL), and the receiver needs to g...

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Abstract

The invention relates to a precise tracking and measuring method of a high dynamic signal of an air fleet link, belonging to the technical field of aeronautical data links and radio navigation, and aiming at providing a precise tracking and measuring method of the high dynamic signal the an air fleet link and an implementation structure to solve the problems in the prior art. The invention provides a system framework of the precise tracking and measuring method of the high dynamic signal of the air fleet link, which can be implemented on a digital signal processor (DSP) and a FPGA (field programmable gate array) of a circuit board, and overcomes the defects of the unfavorable precision of a traditional high dynamic receiver by utilizing a double-loop structure of a frequency tracking loopof carrier tracking and a phase locking loop as well as a code phase locking loop to realize the high precise tracking under a high dynamic condition. The method can be widely applied to satellite navigation receivers, range measurement systems and communication systems based on a quiescent carrier modulation direct sequence spread spectrum system.

Description

Technical field: [0001] The invention relates to a precise tracking and measuring method for high dynamic signals of cluster links, and belongs to the technical fields of aviation data links and radio navigation. Background technique: [0002] Since the link between the member aircraft of the fleet adopts the suppressed carrier BPSK / QPSK phase-shift keying modulation system and the direct sequence spread spectrum mode, there will be problems in signal acquisition and tracking: [0003] ①Under the suppressed carrier communication system, the highly dynamic relative motion between the sender and the receiver causes difficulty in capture and tracking and frequent loss of lock and loss of capture; [0004] ② High dynamics lead to increased carrier tracking error, difficulty in accurate phase alignment of regenerated pseudo codes, and increased ranging and speed measurement errors; [0005] ③ The greatly increased probability of loss of lock and loss of capture will lead to diff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/50
Inventor 杨宜康陈晓敏齐建中
Owner CENT FOR SPACE SCI & APPLIED RES
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