Communications: directive radio wave systems and devices (e.g. – Determining velocity – Combined with determining distance
Patent
1998-12-10
2000-11-14
Gregory, Bernarr E.
Communications: directive radio wave systems and devices (e.g.,
Determining velocity
Combined with determining distance
342 82, 342 89, 342104, 342105, 342118, 342127, 342128, 342134, 342159, 342200, 342201, G01S 1336, G01S 1358
Patent
active
061476382
ABSTRACT:
In a method for operating a radar system, the object is to determine by simple means and at low cost the distance and/or the radial velocity of at least one target object with high resolution. For this purpose, in each measuring phase of the measurement process in the "pulse FMCW radar system", switchover between a transmission mode and a receiving mode is effected a multiple number of times and at short intervals of time. In the transmission mode, all receiving units of the radar system are switched off, while a pulse-shaped (frequency-modulated) transmission signal with time-successive transmission pulses having a specific pulse-on time and a specific carrier frequency is emitted from at least one transmitter unit of the radar system. In receiving mode, all transmitter units are switched off in the pulse-off times of the transmission pulses, while from at least one receiver unit all reflection signals originating from the last emitted transmission pulse are detected as received signal from the entire observation range before emission of the next transmission pulse. The distance and/or the radial velocity of the reflection objects is determined indirectly by the signal processing unit of the radar system by evaluation of the frequency difference and/or phase difference between the transmission signal and the received signal.
REFERENCES:
patent: 3883871 (1975-05-01), Moore
patent: 5592170 (1997-01-01), Price et al.
Currie N.C. &Brown C.E.: "Principles and 1 Applications of Millimeter-wave Radar"1987, ARTECH HOUSE, USA XP00211118861 Paragraph 6.5.2: "Frequency Stepped High-Range-Resolution Technique" pp. 296-298.
Paragraph 13.3.3.: "Stepped Frequency Waveform", pp. 630-633.
Wehner, D.R.: "High Resolution Radar, Second Edition" 1995, ARTECH HOUSE, USA XP002118862 Paragraph 5.2: "Concept of synthetic range-profile generation", pp. 200-209.
Mende Ralph
Rohling Hermann
Automotive Distance Control Systems
Gregory Bernarr E.
Kunitz Norman N.
Spencer George
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