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US 8,026,843 B2Granted
Radar methods and systems using ramp sequences
AssigneeInfineon Technologies AG
InventorVolker Winkler
Life of this patent
Estimating the term…
Abstract
One embodiment of the present invention relates to a method for detecting a range and velocity of a target. In this method, an electromagnetic wave is transmitted over a frequency range, where a period of the wave comprises a number of consecutive ramps. A first ramp in the period is transmitted over a first portion of the frequency range, and a second ramp in the period is transmitted over a second portion of the frequency range that differs from the first portion. The second ramp is offset by a frequency shift relative to the first ramp. A scattered wave is received from the target and processed to determine the range and the velocity of the target. Other methods and systems are also disclosed.
Claims20
A method for detecting a range and a velocity of a target, comprising:
- transmitting an electromagnetic wave over a frequency range, wherein a period of the wave comprises a number of consecutive ramps, a first substantially triangular ramp in the period transmitted over a first portion of the frequency range, and a second substantially triangular ramp in the period transmitted over a second portion of the frequency range that differs from the first portion, the second substantially triangular ramp offset by a frequency shift relative to the first substantially triangular ramp;
- receiving a scattered wave reflected from the target, where the scattered wave is generated when the transmitted electromagnetic wave reflects from the target;
- and
- processing the received scattered wave to determine the range and the velocity of the target.
1 more element
A method for detecting a range and a velocity of a target, comprising:
- transmitting a first consecutive ramp over a first portion of a frequency range, the first consecutive ramp comprising a first ramp segment that is piece-wise continuous with a second ramp segment, wherein the first ramp segment has one of a positive and a negative slope and the second ramp segment has the other of the positive and the negative slope;
- and
- transmitting a second consecutive ramp over a second portion of the frequency range that differs from the first portion of the frequency range, the second consecutive ramp comprising:
- a third ramp segment having approximately the one slope and being piece-wise continuous with the second ramp segment, and a fourth ramp segment having approximately the other slope and being piece-wise continuous with the third ramp segment.
1 more element
A radar system, comprising:
- a radar transmitter configured to transmit an electromagnetic wave over a frequency range, the electromagnetic wave including a first substantially triangular ramp associated with a first portion of the frequency range and a second substantially triangular ramp associated with a second portion of the frequency range that differs from the first portion, where the first substantially triangular ramp is offset by a frequency shift relative to the first substantially triangular ramp;
- and
- a radar receiver configured to receive a scattered wave reflected from a target, and further configured to determine a range and a velocity of the target as a function of a two-dimensional transform performed on a baseband signal derived from the received scattered wave.
A radar system, comprising:
- a memory configured to store ramp-shaping information about a series of consecutive ramps to be transmitted;
- a control state machine configured to read the memory and present slope information related to the ramp shaping information to an accumulator;
- and
- calibration and interpolation circuitry configured to receive un-interpolated frequency information from the accumulator and provide an interpolated value to an analog circuit that includes a voltage controlled oscillator.
1 more element
A radar system, comprising:
- a radar transmitter configured to transmit an electromagnetic wave over a frequency range, the electromagnetic wave including a first substantially triangular ramp associated with a first portion of the frequency range and a second substantially triangular ramp associated with a second portion of the frequency range that differs from the first portion, where the first substantially triangular ramp is offset by a frequency shift relative to the first substantially triangular ramp;
- wherein the radar transmitter comprises an interpolation control circuit that works in conjunction with a calibration memory tuning law circuit to deliver a linear ramp segment within the first and second ramps.
A radar system, comprising:
- a radar transmitter configured to transmit an electromagnetic wave over a frequency range, the electromagnetic wave including a first substantially triangular ramp associated with a first portion of the frequency range and a second substantially triangular ramp associated with a second portion of the frequency range that differs from the first portion, where the first substantially triangular ramp is offset by a frequency shift relative to the first substantially triangular ramp;
- wherein the radar transmitter comprises:
- a memory configured to store ramp-shaping information about the first and second ramps;
- a control state machine configured to read ramp-shaping information from the memory and present slope information related to the ramp-shaping information to an accumulator;
- and
- calibration and interpolation circuitry configured to receive un-interpolated frequency information from the accumulator and provide an interpolated value to a voltage controlled oscillator.
3 more elements
Dependencies are inferred from the claim text.