Circuit arrangement for improving accuracy of angular measurements in radar systems
First Claim
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1. A circuit arrangement for improving the accuracy of angular measurements in a radar system with a first reception channel emitting a sum signal Σ
- , a second reception channel emitting a difference signal Δ
, and circuitry connected to said reception channels for deriving therefrom an angular-deviation signal ε
appearing on an output thereof, comprising;
peak-detection means connected to said first reception channel for generating a succession of enabling pulses each coinciding with a period close to an instant at which the slope of said sum signal Σ
changes from positive to negative values; and
gating means connected to said output and provided with a control input connected to said peak-detection means for passing said angular-deviation signal ε
only in the presence of one of said enabling pulses.
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Abstract
To improve the accuracy of angular measurements in a radar system by suppressing noise due to target glint, an angular-deviation signal ε derived from the output signals Σ and Δ of a sum channel and a difference channel is gated so as to be read only when the sum signal Σ is at or near a maximum. In a more elaborate embodiment, passage of the deviation signal ε is also blocked when a quadrature-deviation signal εq, likewise derived from the sum and difference signals Σ and Δ, has an absolute magnitude above a preferably adjustable threshold.
18 Citations
7 Claims
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1. A circuit arrangement for improving the accuracy of angular measurements in a radar system with a first reception channel emitting a sum signal Σ
- , a second reception channel emitting a difference signal Δ
, and circuitry connected to said reception channels for deriving therefrom an angular-deviation signal ε
appearing on an output thereof, comprising;peak-detection means connected to said first reception channel for generating a succession of enabling pulses each coinciding with a period close to an instant at which the slope of said sum signal Σ
changes from positive to negative values; andgating means connected to said output and provided with a control input connected to said peak-detection means for passing said angular-deviation signal ε
only in the presence of one of said enabling pulses. - View Dependent Claims (2, 5)
- , a second reception channel emitting a difference signal Δ
-
3. A circuit arrangement for improving the accuracy of angular measurements in a radar system with a first reception channel emitting a sum signal Σ
- , a second reception channel emitting a different signal Δ
, and circuitry connected to said reception channels for deriving therefrom an angular-deviation signal ε and
a quadrature-deviation signal ε
q respectively appearing on a first and a second output thereof, comprising;peak-detection means connected to said first reception channel for generating a succession of enabling pulses each coinciding with a period close to an instant at which the slope of said sum signal Σ
changes from positive to negative values;comparison means connected to said second output for deriving a succession of unblocking pulses from those portions of said quadrature-deviation signal ε
q whose absolute values lie below a predetermined threshold; andgating means connected to said output and provided with a control input connected to said peak-detection means and to said comparison means for passing said angular-deviation signal ε
only during coincidence of one of said enabling pulses with one of said unblocking pulses. - View Dependent Claims (4, 6, 7)
- , a second reception channel emitting a different signal Δ
Specification