Method of monitoring an area, and a device for carrying out the method
First Claim
1. Method of monitoring an area with the aid of a frequency-modulated continuous-wave radar comprising:
- emitting a frequency-modulated continuous-wave transmitting signal with at least one transmitting antenna having a directional pattern whose main azimuthal direction depends on the frequency of the transmitting signal,wherein;
related to a predeterminable direction, an azimuthal region is selected,in the selected region, an azimuthal swivelling of the directional pattern of the transmitting antenna is carried out by changing the frequency of the transmitting signal,in the selected region, each azimuthal value is assigned a frequency value of the transmitting signal,the selected region is divided into a predeterminable number of azimuthal increments adjoining one another,in each of said increments, a monotonous change of the frequency of the transmitting signal occurs;
receiving a reflected portion of the transmitting signal, which is reflected by the area to be monitored, with a receiving antenna, andperforming a coherent signal processing for evaluating the receiving signal for each increment.
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Accused Products
Abstract
Monitoring an area with the aid of a frequency-modulated continuous-wave radar includes emitting a frequency-modulated continuous-wave transmitting signal with at least one transmitting antenna having a directional pattern whose main azimuthal direction depends on the frequency of the transmitting signal. Related to a predeterminable direction, an azimuthal region is selected, and in the selected region, an azimuthal swivelling of the directional pattern of the transmitting antenna is carried out by changing the frequency of the transmitting signal. Also in the selected region, each azimuthal value is assigned a frequency value of the transmitting signal. The selected region is divided into a predeterminable number of azimuthal increments adjoining one another, and in each of the increments, a monotonous change of the frequency of the transmitting signal occurs. A reflected portion of the transmitting signal, which is reflected by the area to be monitored, is received with a receiving antenna, and a coherent signal processing for evaluating the receiving signal for each increment coherent signal processing is carried out.
40 Citations
19 Claims
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1. Method of monitoring an area with the aid of a frequency-modulated continuous-wave radar comprising:
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emitting a frequency-modulated continuous-wave transmitting signal with at least one transmitting antenna having a directional pattern whose main azimuthal direction depends on the frequency of the transmitting signal, wherein; related to a predeterminable direction, an azimuthal region is selected, in the selected region, an azimuthal swivelling of the directional pattern of the transmitting antenna is carried out by changing the frequency of the transmitting signal, in the selected region, each azimuthal value is assigned a frequency value of the transmitting signal, the selected region is divided into a predeterminable number of azimuthal increments adjoining one another, in each of said increments, a monotonous change of the frequency of the transmitting signal occurs; receiving a reflected portion of the transmitting signal, which is reflected by the area to be monitored, with a receiving antenna, and performing a coherent signal processing for evaluating the receiving signal for each increment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 19)
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12. A frequency modulated continuous wave radar apparatus, comprising:
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oscillator means for producing a frequency modulated radar signal; transmitter means, including a transmission amplifier and a frequency controlled directional transmitting antenna, for amplifying and transmitting the frequency modulated radar signal; coupling means for coupling the frequency modulated radar signal from the oscillator means to the transmitter means; receiving means, including a frequency controlled directional receiving antenna and a low noise amplifier, for receiving and amplifying a reflected portion of the transmitted frequency modulated radar signal; mixing means, connected to the coupling means for receiving the frequency modulated radar signal from the oscillator means, and connected to the low noise amplifier for receiving the amplified reflected portion of the transmitted frequency modulated radar signal, the mixing means mixing the frequency modulated radar signal and the amplified reflected portion of the transmitted frequency modulated radar signal therein and outputting a baseband signal; filter means for anti-alias band-pass filtering the baseband signal and outputting a filtered signal; analog-to-digital converting means for receiving and sampling the filtered signal and producing a corresponding digital output signal; range resolution means, including fast Fourier transform means, for receiving and resolving radar range information from the digital output signal, and outputting a resolved signal; signal processing means for receiving and processing the resolved signal, including performing distance and velocity corrections, and outputting a processed signal; and display means for displaying the processed signal to an operator of the radar; wherein the frequency modulated radar signal produced by the oscillator means comprises a linear modulated signal which is swept through a predetermined frequency range. - View Dependent Claims (15, 16, 17, 18)
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Specification