US 4,496,951 AGranted

Hyperbolic navigation receiver

AssigneeFujitsu Limited

InventorsKazuo Tsukada, Yoshiharu Kanzaki, Yoshikazu Hori

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Abstract

A hyperbolic navigation receiver locates ships, and the like, by phase-locking the output signal of the voltage-controlled oscillator or voltage-controlled phase shifter of respectively provided tracking loop filters corresponding to the incoming signals from a master and slave station. The voltage-controlled oscillator or voltage-controlled phase shifter is caused to produce an output signal which is a multiple frequency of the incoming signal. Phase discrimination of the output signals is undertaken without the use of a multiplier.

Claims5

Dependent claims

A hyperbolic navigation receiver, comprising

master receiving means corresponding to a master station and a plurality of slave receiving means corresponding to a plurality of slave stations, each of said master and slave receiving means having
receiving means for receiving and distinguishing incoming signals from said master and slave stations, and
a tracking loop filter having an output and including
first generating means for generating a multifrequency signal corresponding to a frequency of said receiving means, said first generating means having an input and an output and providing at said output an output signal which is the output signal of said tracking loop filter, the first gnerating means of said master receiving means comprising a first voltage-controlled oscillator and the first generating means of each of said slave receiving means comprising a first voltage-controlled phase shifter electrically connected to the output of said tracking loop filter of said master receiving means,
first dividing means electrically connected to said first generating means for dividing an output signal of said first generating means to the frequency of an incoming signal from said receiving means, said first dividing means producing an output signal, and
first phase discriminating means electrically connected to said first dividing means for phase discriminating the output signal of said first dividing means from said incoming signal of said receiving means, said first phase discriminating means having an output connected to the input of said of said first generating means and producing at said output an output signal according to which said multifrequency signal is controlled,
second phase discriminating means electrically connected to said first generating means of said tracking loop filter for phase discriminating the output signal of said tracking loop filter of said master receiving means from each of the output signals of said tracking loop filters of said slave receiving means, said second phase discriminating means having an output and producing at said output an output signal for microprocessing, and
second generating means for generating a local multifrequency signal, said second generating means being self-oscillating and each of said receiving means of said slave receiving means further including second dividing means electrically connected to said second generating means for dividing said local multifrequency signal in accordance with the incoming frequency of a received signal from said master and slave stations, said second dividing means producing an output signal, and
first mixing means electrically connected to said second generating means and said second dividing means for mixing said received signal with the output signal of said second dividing means for converting to an intermediate frequency signal.

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Dependencies are inferred from the claim text.

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Abstract

A hyperbolic navigation receiver, comprising

master receiving means corresponding to a master station and a plurality of slave receiving means corresponding to a plurality of slave stations, each of said master and slave receiving means having
receiving means for receiving and distinguishing incoming signals from said master and slave stations, and
a tracking loop filter having an output and including
first generating means for generating a multifrequency signal corresponding to a frequency of said receiving means, said first generating means having an input and an output and providing at said output an output signal which is the output signal of said tracking loop filter, the first gnerating means of said master receiving means comprising a first voltage-controlled oscillator and the first generating means of each of said slave receiving means comprising a first voltage-controlled phase shifter electrically connected to the output of said tracking loop filter of said master receiving means,
first dividing means electrically connected to said first generating means for dividing an output signal of said first generating means to the frequency of an incoming signal from said receiving means, said first dividing means producing an output signal, and
first phase discriminating means electrically connected to said first dividing means for phase discriminating the output signal of said first dividing means from said incoming signal of said receiving means, said first phase discriminating means having an output connected to the input of said of said first generating means and producing at said output an output signal according to which said multifrequency signal is controlled,
second phase discriminating means electrically connected to said first generating means of said tracking loop filter for phase discriminating the output signal of said tracking loop filter of said master receiving means from each of the output signals of said tracking loop filters of said slave receiving means, said second phase discriminating means having an output and producing at said output an output signal for microprocessing, and
second generating means for generating a local multifrequency signal, said second generating means being self-oscillating and each of said receiving means of said slave receiving means further including second dividing means electrically connected to said second generating means for dividing said local multifrequency signal in accordance with the incoming frequency of a received signal from said master and slave stations, said second dividing means producing an output signal, and
first mixing means electrically connected to said second generating means and said second dividing means for mixing said received signal with the output signal of said second dividing means for converting to an intermediate frequency signal.

6 more elements