Digital system and method of estimating non-energy parameters of signal carrier

a signal carrier and non-energy parameter technology, applied in the field of digital system and method of estimating non-energy parameters of signal carriers, can solve the problems of variable time delay between the generation of control signals and the nco control momen

Active Publication Date: 2015-03-05
TOPCON POSITIONING SYST INC
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Problems solved by technology

Since the boundaries of symbols for different satellites do not match, there is a variable time delay between generation of control signals and NCO control moment.

Method used

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  • Digital system and method of estimating non-energy parameters of signal carrier
  • Digital system and method of estimating non-energy parameters of signal carrier
  • Digital system and method of estimating non-energy parameters of signal carrier

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Embodiment Construction

[0023]Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

[0024]FIG. 1 shows a functional block diagram for an embodiment of the invention.

[0025]The measuring system includes a digital PLL with a controllable loop filter (LF), a control unit (CU), a delay meter and an estimator unit (EU) of signal parameters. A digital PLL consists of the following primary components: a digital mixer, an accumulator unit (AU), a phase discriminator (PD), a controllable loop filter (LF), and a numerically controlled oscillator (NCO).

[0026]Let the input of the mixer unit receive digital samples of a real analog process Ua(t)=Uc(t)+UG(t) representing an additive mixture of Binary Phase Shift Key (BPSK)-signal Uc(t) and noise UG(t). The desired signal Uc(t) is equal to

Uc(t)=Ac cos[2πφc(t)+D·π]  (1)

[0027]where Ac is the amplitude of the signal,

[0028]φc(t)=∫fc(t)dt+φ0 is the signal phase [in cycles],

[002...

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Abstract

Navigation satellite receivers have a large number of channels, where phase discriminators and loop filter of a PLL operate in phase with data bits and control of numerically controlled oscillator (NCO) carried out simultaneously on all channels. Since symbol boundaries for different satellites do not match, there is a variable time delay between the generation of control signals and NCO control time. This delay may be measured by counting a number of samples in the delay interval. A proposed system measures non-energy parameters of the BPSK-signal carrier received in additive mixture with noise when a digital loop filter of PLL controls NCO with a constant or changing in time delay. A control unit controls bandwidth and a LF order by changing transfer coefficients based on analyzing estimated signal parameters and phase tracking error at a PD output.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 14 / 117,091, filed on Nov. 12, 2013, which is a US National Phase of PCT / RU2013 / 000543, filed on Jun. 6, 2013, which are both incorporated by reference herein in their entirety.BACKGROUND OF THE INVENTION[0002]Phase, frequency and rate of change of frequency are parameters independent of energy of the input signal (i.e., they are non-energy parameters). There are conventional methods of estimating non-energy parameters of a signal based on processing of variables received from a phase locked loop (PLL).[0003]A method and apparatus are used for estimating changing frequency of a signal received by a satellite receiver, see U.S. Pat. No. 7,222,035. The system includes a PLL having a numerically controlled oscillator (NCO) and a filter of frequency estimates (FFE). The PLL tracks the changing signal frequency and outputs non-smoothed frequency estimates into the FFE. The F...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L25/02H04L7/033H04B17/00
CPCH04L25/0262H04B17/00H03L2207/50H03L7/08H04L7/0331G01S19/37H04B17/364
Inventor ZHODZISHSKY, MARK I.PRASOLOV, VICTOR A.VEITSEL, VLADIMIR V.ZHODZISHSKY, DMITRY M.LEBEDINSKY, ALEXEY S.IVANTSOV, ILYA V.
Owner TOPCON POSITIONING SYST INC
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