RADAR ARRANGEMENT
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0 Petitions
Accused Products
Abstract
An FMCW radar has a variable frequency microwave signal source for outputting a microwave signal, a frequency divider, a phase-locked loop, a loop filter and a reference signal source. The frequency divider is connected between the output of the variable frequency microwave signal source and an input of the phase-locked loop. The loop filter is connected between the output of the phase-locked loop and the input of the variable frequency microwave signal source. The reference signal source is connected to an additional input of the phase-locked loop. The frequency divider is adjustable, in particular digitally adjustable. A method for operating an FMWC radar includes adjusting a variable frequency microwave signal source by way of a closed-loop control circuit which uses a reference signal of a reference signal source, especially of a quartz oscillator, as the reference value, and a frequency-divided output signal of the microwave signal source as the feedback value.
37 Citations
29 Claims
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1-11. -11. (canceled)
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12. An FMCW radar, comprising:
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a tunable microwave signal source for outputting a microwave signal, said tunable microwave signal source having an input and an output; a phase-locked loop having an input, a further input, and an output; an adjustable frequency divider connected between said output of said tunable microwave signal source and said input of said phase-locked loop; a loop filter connected between said output of said phase-locked loop and said input of said tunable microwave signal source; and a reference signal source connected to said further input of said phase-locked loop. - View Dependent Claims (13, 14, 15)
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16. A method of operating an FMCW radar, which comprises:
setting a tunable microwave signal source by way of a closed-loop circuit using a reference signal of a reference signal source as a reference variable and a frequency-divided output signal of the microwave signal source as a feedback variable. - View Dependent Claims (17, 18, 24)
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19. A method for adaptively correcting an FMCW background signal, which comprises the following steps:
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recording an FMCW radar signal; determining a most probable FMCW radar background signal from a plurality of FMCW radar background signals; comparing the recorded FMCW radar signal with the most probable FMCW radar background signal; and if the recorded FMCW radar signal differs from the most probable FMCW radar background signal by less than a predetermined threshold value, storing the recorded FMCW radar signal as the FMCW radar background signal. - View Dependent Claims (20, 25)
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21. A method for suppressing an FMCW radar background signal, which comprises the following steps:
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recording an FMCW radar signal; determining a most probable FMCW radar background signal from a plurality of FMCW radar background signals; comparing the recorded FMCW radar signal with the most probable FMCW radar background signal; and if the recorded FMCW radar signal differs from the most probable FMCW radar background signal by more than a predetermined threshold value, subtracting the most probable FMCW radar background signal from the recorded FMCW radar signal. - View Dependent Claims (22)
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- 23. A method for interference suppression of at least one, two, or more FMCW radars, which comprises temporally offsetting respective frequency ramps of mutually interfering FMCW radars relative to one another.
Specification