Doppler radar automatic signal detection apparatus专利检索-随机效应防辐射专利检索查询-专利查询网

Doppler radar automatic signal detection apparatus

阅读：587发布：2022-07-19

专利汇可以提供Doppler radar automatic signal detection apparatus专利检索，专利查询，专利分析的服务。并且The electrical output of a noncoherent doppler radar is applied to a noise AGC system which varies the channel gain so as to maintain substantially constant the level of random noise, thereby counteracting the noise-level distorting effects of AGC in the radar I.F. amplifier. Variations in the radar output due to changes in strength or spread of clutter signals are reduced by a clutter control circuit including a self-adapting filter which automatically changes its lower-frequency cutoff skirt so as to increase the attenuation of clutter signals when the energy of the interfering clutter-signal components tends to increase. After passing through the noise AGC circuit and clutter control circuit in series, the energy of the resultant signal varies substantially only due to the presence or absence of desired moving-target-produced received signals, and is applied to an energy-responsive threshold circuit to produce automatically an output signal indicative of moving target presence or absence. Either the noise AGC circuit or the clutter control circuit can be used by itself without the other.，下面是Doppler radar automatic signal detection apparatus专利的具体信息内容。

权利要求

1. In a noncoherent doppler radar system for detecting target objects moving with respect to reference objects by receiving and sensing signals from said target objects having frequency components doppler-shifted with respect to frequency components of signals from said reference objects, said system comprising means for receiving said signals from said target objects and from said reference objects, first variable-gain means for amplifying said received signals from said target objects and from said reference objects, first frequency-selective means for selectively enhancing said doppler-shifted components with respect to frequency components of said signal from said reference objects, automatic gain control means for controlledly varying the gain of said first amplifying means in response to the strength of signals from said first amplifying means and in the sense to reduce the gain when said received signals increase in strength, the improvement which comprises: noise AGC means, comprising second amplifying means supplied with the output of said first frequency-selective means, second frequency-selective means supplied with the output of said second amplifying means for selectively passing noise frequency components lying outside the spectra of frequency components produced by target objects and reference objects, means for generating a gain-control signal in response to noise frequency components passed by said second frequency-selective means, and means for varying the gain of said second amplifying means in response to said control signal, in the sense to maintain substantially constant the level of said noise frequency components in said output of said second amplifying means; and means supplied with the output of said second amplifying means for detecting the presence or absence therein of said signals from target objects.

2. In a noncoherent doppler radar system comprising means for transmitting time-spaced pulses of electrical energy, means for receiving reflections of said transmitted pulses from reference objects and from target objects moving with respect to said reference objects to produce received signals, first variable-gain amplifier means for amplifying said received signals, gating means for selectively passing received signals produced by objects in different sequentially-selected range bins in response to different ones of said transmitted pulses, first AGC means responsive to the output of said gating means to vary the gain of said first variable-gain amplifier means in the sense to reduce said gain when the strength of said reflections from reference objects in the selected range bin increases; and first filter means for selectively enhancing frequency components in the output of said gating means which are in or adjacent the spectral band produced by said target objects, the improvement comprising: second variable-gain amplifier means supplied with the output of said first filter means; second AGC means responsive to those frequency components of noise in the output of said second variable-gain amplifier means which are situated adjacent but outside said spectral band, for varying the gain of said second AGC means in the sense to maintain substantially constant the level of said noise frequency components in the output thereof; and means responsive to the output of said second AGC means for sensing changes therein due to the presence or absence of signals due to target objects.

3. Automatic detection apparatus for use with a noncoherent doppler radar of the type which produces a combined output signal comprising clutter-signal frequency components of variable strength and frequency-spread occupying a first spectral band, moving-target signal frequency components in a second spectral band doppler-shifted upward in frequency with respect to said clutter-signal frequency components to an extent dependent upon the velocities of target objects, and noise-signal frequency components of variable level and occupying a third spectral band extending within and above said second spectral band, said apparatus comprising: noise AGC means supplied with said combined output signal for producing a corresponding output signal in which said noise level is substantially constant; clutter-control means supplied with the output of said noise AGC means for automatically providing an increased attenuation of said clutter-signal components in the higher-frequency portion of said first spectral band when the energy of said last-named components increases above a predetermined level; and energy-threshold means for producing an output signal in response to increases above a threshold value of the energy of the output from said clutter-control means.

4. Apparatus in accordance with claim 3, in which said noise AGC means comprises variable-gain means, and first filter means selectively responsive to noise frequency components outside said second spectral band for developing and applying to said variable-gain means a gain-control signal to maintain said noise level substantially constant in the output of said variable-gain means; and in which said clutter-control means comprises second filter means having a lower-frequency skirt which is controllably variable in frequency position in the higher-frequency portion of said first spectral band and third filter means for selecting frequency components in said higher-frequency portion of said first spectral band for producing and applying to said second filter means a control signal to vary the frequency position of said skirt.

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Doppler radar automatic signal detection apparatus

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