57results about How to "Constant amplitude" patented technology

Provided is a pulse radar system capable of measuring the distance to an obstacle with high accuracy irrespective of the distance to an obstacle by securing distance resolution with respect to a reflective wave from an obstacle at a short distance, and preventing a decline in S / N ratio with respect to a reflective wave from an obstacle at a long distance. A pulse radar system includes a transmitting circuit, a transmitting antenna, a receiving antenna, a receiving circuit, and a gain control circuit. The gain control circuit generates a gain control signal corresponding to the amplitude of the reception pulse obtained in response to a gain control transmission pulse wave transmitted from the transmitting circuit, and controls the gain of a reception pulse wave or a reception pulse obtained in response to a measurement transmission pulse wave transmitted from the transmitting circuit after the gain control transmission pulse wave.

A communications system of the present invention includes a transmitter that is operative for combining an orthogonal Walsh modulation with a minimum shift keying or Gaussian minimum shift keying waveform to form a hybrid communications signal that carries communications data over a constant amplitude waveform that is spread in time and frequency. This communications signal can be transmitted to a RAKE receiver that has a plurality of correlators with output weights formed for processing this hybrid communications signal.

An ultrasonic measuring device for measuring a fluid flowing in a pipe includes a housing and transducers. The housing receives and fixes the pipe, so that the fluid can flow through a central recess in a flow direction. The ultrasonic transducers emit and receive ultrasonic signals. Two first ultrasonic transducers are arranged laterally on a first side of the central recess, and two second ultrasonic transducers are arranged on a second side of the central recess. The second side is opposed to the first side, so that the recess is located between the first and the second ultrasonic transducers, and the ultrasonic transducers are arranged and aligned so that one of the first ultrasonic transducers emits a first measuring signal to one of the second ultrasonic transducers obliquely to the flow direction and receive a second measuring signal emitted by the second ultrasonic transducer obliquely to the flow direction.

A signal generator generates a coded or memory waveform having a trellis structure. A modulator is operative with the signal generator for adding at least one phase pulse to the trellis structure of the coded or memory waveform to create a substantially constant envelope modulated signal that increases the transmitted bits per symbol.

In order for keeping the amplitude of the excitation current of a vibrator constant irrespective not only of the temperature variation but also of the manufacturing variation and the variation in frequency, a comparison control circuit for controlling the amplitude of the drive signal for exciting the vibrator includes a comparative voltage supply circuit for supplying the comparative voltage, and the comparative voltage supply circuit generates the comparative voltage with a constant current source and a second resistor made of a material the same as a material of a first resistor included in a current-voltage conversion circuit.

A coordinated scheduling strategy for multiple energy storage in an optical storage distributed microgrid system, based on a two-stage converter topology structure for multiple energy storage, includes a front-stage bidirectional DC / DC conversion unit and a rear-stage DC / AC conversion unit. The bidirectional DC / DC conversion unit for the battery and the bidirectional DC / DC conversion unit for the super capacitor share a DC bus, and are connected to the load and the large power grid through the DC / AC conversion unit through the LC filter. The method for coordinated scheduling of two-stage converters for multiple energy storage is as follows: in the grid-connected mode of the distributed optical storage microgrid system, double filtering control is performed on the two-stage converters for multiple energy storage, and the energy storage elements are controlled. It is used to smooth the fluctuation of photovoltaic output power, and adjust the respective filtering parameters according to the state of charge of the supercapacitor and the state of charge of the battery; when the distributed optical storage microgrid system is off-grid, the energy storage element is controlled to be distributed optical storage. The microgrid system provides voltage and frequency support, and the distributed optical storage microgrid system jointly supplies power for the load; the energy storage elements are batteries and supercapacitors.