Airborne altitude indicator device专利检索-正弦波滤波器变压器和转换设备专利检索查询-专利查询网

Airborne altitude indicator device

阅读：682发布：2023-04-03

专利汇可以提供Airborne altitude indicator device专利检索，专利查询，专利分析的服务。并且An airborne altimeter system indicates the instant when a descending craft equipped with that system reaches a predetermined operating altitude. A transceiver aboard the craft emits a continuous high-frequency sine wave toward the ground and isolates a low-frequency Doppler component from an incoming reflected wave due to ground echoes. The Doppler component is peak-detected and the resulting envelope signal is fed to two passive impedance networks having different transfer functions so that the magnitude ratio of their output signals is equal to a predetermined value as soon as the operating altitude is reached. A comparator derives the desired altitude indication from these output signals to actuate a utilization circuit. In order to make the magnitude ratio of the output signals of the impedance network substantially independent of the rate of descent of the craft, within a predetermined speed range, the envelope signal fed to each network may be weighted by filters of different attenuation characteristics inserted between the transceiver output and respective peak detectors lying in cascade with the two impedance networks.，下面是Airborne altitude indicator device专利的具体信息内容。

权利要求

1. An airborne altimeter system for indicating the attainment of a predetermined operating altitude by a descending craft carrying same, comprising: transceiver means for emitting a continuous sine wave of highfrequency electromagnetic radiation toward the ground, receiving reflected ground echoes of said sine wave and isolating therefrom a low-frequency Doppler component of an amplitude varying inversely with ground distance; peak-detection means connected to said transceiver means for deriving from said Doppler component an aperiodic envelope signal proportional to the amplitude thereof; a pair of passive impedance networks with mutually different transfer functions connected to said peak-detection means for energization by said envelope signal, said networks generating respective output signals of progressively varying magnitude ratio upon continuing descent of the craft; comparison means with two inputs respectively connected to said networks; and utilization means connected to said comparison means for actuation upon said ratio reaching a predetermined value.

2. A system as defined in claim 1 wherein said networks are resistance-capacitance circuits.

3. A system as defined in claim 2 wherein said resistance-capacitance circuits are an integrating network and a differentiation network, respectively.

4. A system as defined in claim 3 wherein said integrating and differentiation networks have substantially identical time constants.

5. A system as defined in claim 1 wherein said peak-detection means comprises a single peak detector having an output connected in parallel to said networks.

6. A system as defined in claim 1 wherein said peak-detection means comprises a pair of peak detectors, said transceiver means having an output circuit with two parallel branches each including one of said peak detectors in cascade with one of said networks.

7. A system as defined in claim 6, further comprising a pair of weighting circuits of different transmission characteristics in a frequency band of said Doppler component corresponding to a predetermined speed range, said weighting circuits being inserted in said branches in cascade with said peak detectors to maintain the value of said ratio substantially independent of the rate of descent of the craft within said speed range.

8. A system as defined in claim 7 wherein said weighting circuits comprise a low-pass filter and a high-pass filter each lying between said transceiver means and a respective peak detector.

9. A system as defined in claim 8 wherein said filters have substantially identical attenuation values at a mean frequency of said Doppler component corresponding to the midpoint of said speed range.

10. A system as defined in claim 9 wherein the attenuation characteristics of said filters are of substantially symmetrical slope within said frequency band.

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Airborne altitude indicator device

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