Correlator device
First Claim
1. A correlator device for determining the correlation function of two phase-modulated signals having a given carrier frequency comprising, phase detecting means to which the said modulated signals are applied separately for delivering the phase difference φ
- 1 and φ
2 between said modulated signals and a reference signal, delay means for delaying one of the signals in relation to the other by a variable delay time, subtractor means for forming the difference φ
1- φ
2, computing means for forming the sine and the cosine of the difference φ
1- φ
2, for integrating separately said sine and cosine during a given period of time and, for delivering the sum of the square of the result of said integrations, and means for varying said variable delay time.
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Abstract
The present invention relates to devices for correlating two phase-modulated signals, in order to determine the delay between said two signals. The signals are applied to phase detectors which receive one and the same local wave. One of the signals is delayed by a variable delay time. The phase values obtained are subtracted from one another. The result is then integrated in the complex plane for a given period of time. The variation of the variable delay permits to determine the correlation function and in particular, the position and the amplitude of the correlation peak.
23 Citations
12 Claims
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1. A correlator device for determining the correlation function of two phase-modulated signals having a given carrier frequency comprising, phase detecting means to which the said modulated signals are applied separately for delivering the phase difference φ
- 1 and φ
2 between said modulated signals and a reference signal, delay means for delaying one of the signals in relation to the other by a variable delay time, subtractor means for forming the difference φ
1- φ
2, computing means for forming the sine and the cosine of the difference φ
1- φ
2, for integrating separately said sine and cosine during a given period of time and, for delivering the sum of the square of the result of said integrations, and means for varying said variable delay time.
- 1 and φ
-
2. A correlator device for determining the correlation function of two phase-modulated signals having a given carrier frequency comprising, phase detecting means to which the said modulated signals are applied separately for delivering the phase differences φ
- 1 and φ
2 between said modulated signals and a reference signal, sampling and storing means for storing separately series of samples of said phase differences φ
1 and φ
2, read-out means for reading out the two series of stored samples in accordance with the chronological order of recording and with a variable shift between the samples of one series in relation to those of the other, subtractor means for forming the phase difference φ
1- φ
2 of each pair of samples read-out, computing means for forming the sine and the cosine of said phase difference φ
1- φ
2, for integrating separately said sine and cosine during the read out time of the samples and for delivering the sum of the square of the results of integrations, and means for varying said variable shift. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- 1 and φ
Specification