US6181273B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar distance sensor
Assignee: Siemens AG
•
Filing: 1998-01-26
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Granted: 2001-01-30
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Expires: 2018-01-26
Abstract
Abstract Microwave radar: an additional modulation of the microwave signal (s (t)) provided for the emission or of the reception signal (e (t)) makes it possible to separate the payload signal from the noise signal parts in a following demodulation and filter unit (HP, MI2, TP). To this end, a modulation unit (MO, RG) for suitably modulating the signal to be emitted is provided preceding the antenna (A). The undesired noise signals produced by the components of the radar sensor itself are not modulated and can therefore be separated from the payload signal by filtering. This separation ensues after a raw measured signal (mess' (t)) has been generated by mixing transmission and reception signal (MI). A renewed demodulation with the modulation signal (r t)) of the modulation unit supplies the final measured signal (mess 2 (t)) determinant for the determination of the distance, whereby the noise signals are previously removed by high-pass filtering and/or are subsequently removed by low-pass filtering.
Inventors
- 👤 Patric Heide
- 👤 Martin Nalezinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:37
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/35; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
188 words
An apparatus for distance measurement, comprising: a signal source for generating a frequency-modulated microwave signal; an antenna arrangement for emitting the microwave signal and for receiving a signal reflected at an object; a modulation unit for additionally modulating the microwave signal provided for emission and/or the reflected signal with a modulation signal; a mixer for generating a mixed product of the microwave signal generated by the signal source and the reflected signal modulated by the modulation unit; and a demodulation and filter unit for removing a portion of the mixed product that lies below a lowest frequency of the modulation signal with a filter and for processing a remaining part of the mixed product by mixing with the modulation signal to form a measured signal; the antenna arrangement being composed of an antenna that is provided for transmission and reception; a transmission/reception diplexer for conducting the microwave signal from the signal source to the antenna and for conducting the reflected signal from the antenna to the demodulation and filter unit; and the modulation unit has a bidirectional modulator that is arranged between this transmission/reception diplexer and the antenna.
Claim 2
Independent Claim
188 words
An apparatus for distance measurement, comprising: a signal source for generating a frequency-modulated microwave signal; an antenna arrangement for emitting the microwave signal and for receiving a signal reflected at an object; a modulation unit for additionally modulating the microwave signal provided for emission and/or the reflected signal with a modulation signal; a mixer for generating a mixed product of the microwave signal generated by the signal source and the reflected signal modulated by the modulation unit; and a demodulation and filter unit for removing a portion of the mixed product that lies below a lowest frequency of the modulation signal with a filter and for processing a remaining part of the mixed product by mixing with the modulation signal to form a measured signal; the antenna arrangement being composed of an antenna that is provided for transmission and reception; a transmission/reception diplexer for conducting the microwave signal from the signal source to the antenna and for conducting the reflected signal from the antenna to the demodulation and filter unit; and the modulation unit has a bidirectional modulator that is arranged between this transmission/reception diplexer and the antenna.
Claim 3
Dependent Claim
21 words
The apparatus according to claim 1 , wherein the modulation signal effects a phase modulation with a phase boost of 180°.
Claim 4
Dependent Claim
58 words
The apparatus according to claim 1 , wherein the modulation and filter unit have a high-pass filter and a further mixer; wherein the high-pass filter is arranged between the mixer and this further mixer; and wherein the further mixer is arranged such that the further mixer mixes the signal coming from the high-pass filter with the modulation signal.
Claim 5
Dependent Claim
57 words
The apparatus according to claim 1 , wherein the demodulation and filter unit has a low-pass filter and a further mixer; the further mixer being arranged such that the further mixer mixes the signal coming from the mixer with the modulation signal; and wherein the signal supplied by the further mixer is supplied to the low-pass filter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-01-30 | 2004-07-31 | 2005-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-01-30 | 2008-07-31 | 2009-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-01-30 | 2012-07-31 | 2013-01-30 | $7700.00 | Window Closed / Lapsed |