Process for determining the intermediate frequency deviation in frequency pulsed radar systems
First Claim
1. For use in a frequency-pulse radar system wherein echo signals from transmitted pulses are mixed with an intermediate frequency which is based on a reference frequency, a method for determining a deviation of said intermediate frequency relative to said reference frequency, said method comprising the steps of:
- sampling echo pulses contained in an echo signal reflected from an individual target object, at a plurality of phase staggered points within one of a single echo pulse and successive echo pulses of said echo signal, to obtain sampled values thereof;
Doppler filtering said sampled values whereby a plurality of Doppler signals having the same frequency are generated; and
determining said deviation of said intermediate frequency as a function of phase differences of said Doppler signals.
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Abstract
The invention relates to a process for determining the deviation of the intermediate frequency from a given reference frequency (fR) in the case of a frequency-pulse radar system, characterized by
the time-related scanning of the echo signal such that, from an echo pulse of an individual target, several scanning values are obtained at different, preferably equidistant points in time within the echo pulse,
the Doppler filtering by way of the thus obtained scanning values of an individual target so that several Doppler signals of the same frequency are obtained from the same target from whose phase differences the intermediate-frequency deviation is determined.
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Citations
7 Claims
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1. For use in a frequency-pulse radar system wherein echo signals from transmitted pulses are mixed with an intermediate frequency which is based on a reference frequency, a method for determining a deviation of said intermediate frequency relative to said reference frequency, said method comprising the steps of:
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sampling echo pulses contained in an echo signal reflected from an individual target object, at a plurality of phase staggered points within one of a single echo pulse and successive echo pulses of said echo signal, to obtain sampled values thereof; Doppler filtering said sampled values whereby a plurality of Doppler signals having the same frequency are generated; and determining said deviation of said intermediate frequency as a function of phase differences of said Doppler signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Method of controlling a frequency shift of a frequency-pulse radar system wherein echo signals from transmitted pulses are mixed with an intermediate frequency which is based on a reference frequency, a method for determining a deviation of said intermediate frequency relative to said reference frequency, said method comprising the steps of:
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sampling echo pulses contained in an echo signal reflected from an individual target object, at a plurality of phase staggered points within one of a single echo pulse and successive echo pulses of said echo signal, to obtain sampled values thereof; Doppler filtering said sampled values whereby a plurality of Doppler signals having the same frequency are generated; determining said deviation of said intermediate frequency as a function of phase differences of said Doppler signals; and controlling said intermediate frequency by means of a closed loop control, based on said deviation as determined in said determining step.
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Specification