Boots – shoes – and leggings
Patent
1995-10-10
1998-06-16
Zanelli, Michael
Boots, shoes, and leggings
364426044, 180169, 342109, G01S 1300
Patent
active
057681317
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a computerised radar process.
Up to now, radar techniques for measuring distances and relative speeds have found their primary application in the field of air traffic. There, one is concerned with the determination of distances in a range extending from some hundreds of metres up to several kilometres. In contrast to this, the particular circumstances of road traffic require the determination of distances in a range extending from less than one metre up to more than a hundred metres. Moreover, the corresponding, autonomous safety devices and spacing-warning devices in a vehicle have to be able to simultaneously capture items of data which contain as much characteristic information as possible regarding the usually complicated and, in contrast to the flight paths for air traffic, concealed street scenes as well as the relatively many obstacles. In principle, one needs to register three types of data in order to obtain an indication as regards the magnitude of the obstacle, namely, the distance between a vehicle and the obstacle, the relative speed between a vehicle and the obstacle (by means of the Doppler-effect) and the amplitude of the transmit signal which is reflected by the obstacle.
A further requirement for a radar process that is to carried out autonomously in a vehicle is that it should be implemented in a cost-effective manner as otherwise any mass utilisation would not be economically viable. As investigations undertaken within the framework of the invention have shown, known radar processes, which simultaneously permit measurements of the distance and relative speed and the detection of a plurality of obstacles (Kleinheubacher Reports 1992, Vol 35, pages 731 to 740), can only be realised at extremely high cost in these respects since large difference frequencies ensue by virtue of the steep frequency gradients and the bandwidth which has to be processed (in the upper MHz range) is too great for commercial signal processors.
SUMMARY OF THE INVENTION
Accordingly, the object of the invention is to develop a computerised radar process which process is able to simultaneously determine, in respect of a plurality of obstacles, the distances, the relative speeds and the amplitude of the reflected signal as a measure for the magnitude of the obstacles.
Thus, in the radar process in accordance with the invention, which is intended to be effected by means of a commercial signal processor without any manual intervention, test signals, in the form of the reflected transmit signals and which are detected in accordance with an intrinsically known method (the reflection of radar signals), are altered in a deliberate manner, namely, in conformity with a particular set of rules that ensure the fulfilment of the requirements formulated in the above statement of object when using simple devices. Hereby, the process embodies new modulation steps as well as a new way of evaluating the reflected signals that are received. One special feature of the modulation process consists in that the radar signals are composed of bursts i.e. chunks of constant frequency, the number of which is determined by the desired precision of the measurement. During the first three measurements, a number of 128 bursts has proved to be useful whereas for the fourth measurement, it was a number of 36 bursts. The length in time of such a burst expediently amounts to approximately 20 .mu.s; all of the signals reflected by the obstacle are detected once this period of time has elapsed, i.e. the received signal for the relevant transmit signal burst is in a steady state condition since the transmitted signal was in the form of a pure sine wave. This enables a complex sample to be taken at the end of each received reflected burst, which sample contains the steady state phase of the transit time waveform of the reflection. For a burst length of 20 .mu.s, this would correspond to a sampling frequency of 50 kHz which, in advantageous manner, is thus relatively very low.
The process in accordanc
REFERENCES:
patent: 4450444 (1984-05-01), Wehner et al.
patent: 4602258 (1986-07-01), Sarfati
patent: 4618864 (1986-10-01), Martin et al.
Lissel Ernst
Plagge Wilfried
Rohling Hermann
Silberberg Charles T.
Streeter Tom
Zanelli Michael
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