A method capable of effectively tracking Doppler rate-of-change signals with extremely low signal-to-noise ratio

A technology of frequency change rate and signal-to-noise ratio, applied in the direction of automatic power control, electrical components, etc., can solve problems such as inability to track effectively, low signal-to-noise ratio, etc.

Inactive Publication Date: 2011-12-28
10TH RES INST OF CETC
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Problems solved by technology

To solve the problem that the existing technology cannot effectively track the deep-space measurement and control signals with extremely low signal-to-noise ratio and Doppler frequency change rate

Method used

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  • A method capable of effectively tracking Doppler rate-of-change signals with extremely low signal-to-noise ratio
  • A method capable of effectively tracking Doppler rate-of-change signals with extremely low signal-to-noise ratio
  • A method capable of effectively tracking Doppler rate-of-change signals with extremely low signal-to-noise ratio

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Embodiment Construction

[0014] refer to figure 1 . In the mathematical model of the digital phase-locked loop, the ultra-narrowband carrier loop filter transformation function is: F(z)=G 1 +G 2 / (1-z -1 )+G 3 / (1-z -1 ) 2 , where G 1 =rd / T,G 2 =rd 2 / T,G 3 =krd 3 / T; and d=4BT(r-k) / r(r-k+1), r=4ξ; where B is the loop bandwidth, T is the loop filter operation cycle, ξ is the loop damping coefficient, and k is the third order Loop gain coefficient, the typical value of the third-order loop gain coefficient k is 1 / 4~1 / 2. to G 1 , G 2 , G 3 Subtract the phase detector gain k d and digitally controlled oscillator DCO to adjust the sensitivity k c After that, the actual factor g of the loop filter can be obtained 1 , g 2 , g 3 . Phase detector gain k d Equal to the digital amplitude of the input signal, the adjustment sensitivity of the DCO k c =2πf s / 2 n , n is the output digit of DDS phase accumulator, f s is the sampling frequency of the system.

[0015] refer to figure 2 . ...

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Abstract

The present invention proposes a method capable of effectively tracking Doppler frequency change rate signals with extremely low signal-to-noise ratio, aiming to provide a method that can more accurately and effectively track extremely low SNR Doppler frequency change rate signals in deep space measurement and control. Technical methods for measuring and controlling signals. The present invention is realized through the following technical solutions: the measurement and control receiver obtains the received signal through A / D sampling, and locks and tracks through the ultra-narrowband third-order phase-locked loop in the mathematical model of the phase-locked loop, and extracts the signal Doppler from the loop. Le, the received signal enters the intermediate frequency ultra-narrowband digital phase-locked loop, and the Doppler frequency and Doppler change rate are sent to the third-order phase-locked loop, and then the ultra-narrowband phase-locked loop and the digital third-order phase-locked loop are used to Narrowband carrier loop to track deep space measurement and control signals with extremely low signal-to-noise ratio and Doppler frequency change rate. The invention combines extremely narrow carrier loop bandwidth and digital third-order phase-locked loop to effectively solve the problem of tracking the measurement and control signal by the download wave loop under the condition of multiplier frequency change rate when the signal-to-noise ratio of the received signal is very low.

Description

technical field [0001] The invention relates to a method for tracking a Doppler frequency change rate signal with an extremely low signal-to-noise ratio in aerospace deep space measurement and control. Background technique [0002] At present, the ground-based measurement and control system, space-based measurement and control system, remote sensing ground receiving station and satellite communication station realize the tracking of the measurement and control signal through the second-order phase-locked loop with relatively wide bandwidth. Due to a series of reasons such as long mission period in deep space, huge communication delay, limited link bandwidth, weak signal, and more critical data, there is a big difference between deep space measurement and control and measurement and control communication of earth-orbiting spacecraft. The current tracking technology methods There are certain defects, and it is difficult to realize the tracking of deep-space measurement and con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/18
Inventor 陈凌汪远玲陈玲
Owner 10TH RES INST OF CETC
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