Methods and systems for improving signal to phase noise in radars
First Claim
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1. A method for increasing sensitivity of Doppler radar receivers, the method comprising:
- transmitting at a transmitter a predetermined pulse repetition frequency (PRF) that is a multiple of inverse time delay for a predetermined range from a target of interest to position nulls in a filter function multiplying a power spectral density of phase noise to cancel portions of the power spectral density of the phase noise;
the portions of the power spectral density of the phase noise being selected so that effect of phase noise in radar sensitivity is reduced.
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Abstract
Methods and systems that reduce the effect of phase noise in radar receivers. The received phase noise spectrum is modulated with periodic nulls due to the two way range delay function. The system and method include strategically positioning the nulls of the delay function to cancel portions of phase noise power spectral density, the portions of the power spectral density of the phase noise being selected so that effect of phase noise in radar sensitivity is reduced.
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Citations
7 Claims
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1. A method for increasing sensitivity of Doppler radar receivers, the method comprising:
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transmitting at a transmitter a predetermined pulse repetition frequency (PRF) that is a multiple of inverse time delay for a predetermined range from a target of interest to position nulls in a filter function multiplying a power spectral density of phase noise to cancel portions of the power spectral density of the phase noise; the portions of the power spectral density of the phase noise being selected so that effect of phase noise in radar sensitivity is reduced. - View Dependent Claims (2, 3)
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4. A pulsed Doppler radar system comprising:
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a transmitter comprising a pulse train generator providing a predetermined pulse repetition frequency (PRF); the pulse train generator being configured to select the predetermined PRF; wherein the pulse train generator is configured to select the predetermined PRF that is a multiple of inverse time delay for a predetermined range from a target of interest, such that nulls in a filter function multiplying a power spectral density of phase noise are positioned such that portions of the power spectral density of the phase noise are canceled; said portions being selected so that effect of phase noise in radar sensitivity is reduced. - View Dependent Claims (5)
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6. A CW Doppler radar receiver system comprising a predetermined time delay component at a receiver input;
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the predetermined time delay component selected such that a sum of an additional predetermined time delay and a time delay corresponding to a predetermined pulse repetition frequency (PRF), which is a multiple of inverse time delay for a predetermined range from a target of interest, is a multiple of a predetermined system delay time, such that nulls in a filter function multiplying a power spectral density of phase noise are positioned such that portions of the power spectral density of the phase noise are canceled; said portions being selected so that effect of phase noise in radar sensitivity is reduced. - View Dependent Claims (7)
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Specification