Abstract: A transmitting unit of a short-range radar includes a first pulse generating unit, a second pulse generating unit, an oscillator and a switch, and while complying with the spectrum mask specified for a UWB short-range radar, emits a predetermined short pulse wave not interfering with the RR prohibited band or the SRD band into the space. The first pulse generating unit outputs a first pulse having the width larger than the width of the short pulse wave in a predetermined period. The second pulse generating unit outputs a second pulse having the width corresponding to the width of the short pulse wave during the period when the first pulse generating unit outputs the first pulse.

Abstract: A transmitter section radiates a short range wave to a space. A receiver section has a detector circuit composed of a branch circuit which receives a reflection wave of the short range wave radiated to the space by means of the transmitter section and branches in phase a signal of the reflection wave into first and second signals, a linear multiplier which linearly multiplies the first and second signals branched in phase by means of the branch circuit, and a low pass filter which samples a baseband component from an output signal from the linear multiplier. A signal processor section carries out an analyzing process of an object which exists in the space based on an output from the receiver section. A control section makes a predetermined control with respect to at least one of the transmitter section and the receiver section based on an analysis result from the signal processor section.

Abstract: A transmitting unit of a short-range radar includes a first pulse generating unit, a second pulse generating unit, an oscillator and a switch, and while complying with the spectrum mask specified for a UWB short-range radar, emits a predetermined short pulse wave not interfering with the RR prohibited band or the SRD band into the space. The first pulse generating unit outputs a first pulse having the width larger than the width of the short pulse wave in a predetermined period. The second pulse generating unit outputs a second pulse having the width corresponding to the width of the short pulse wave during the period when the first pulse generating unit outputs the first pulse.

Abstract: A transmitter section radiates a short range wave to a space. A receiver section has a detector circuit composed of a branch circuit which receives a reflection wave of the short range wave radiated to the space by means of the transmitter section and branches in phase a signal of the reflection wave into first and second signals, a linear multiplier which linearly multiplies the first and second signals branched in phase by means of the branch circuit, and a low pass filter which samples a baseband component from an output signal from the linear multiplier. A signal processor section carries out an analyzing process of an object which exists in the space based on an output from the receiver section. A control section makes a predetermined control with respect to at least one of the transmitter section and the receiver section based on an analysis result from the signal processor section.

Abstract: In order to enable intermittent output of an oscillation signal without essentially producing a leak in response to a pulse signal indicating a transmission timing of a radar wave, a radar oscillator is provided which employs a configuration in which an operation of an oscillating unit itself is alternately changed between an oscillating state and an oscillation stop state by a switch, rather than a configuration in which an output passage of an oscillation signal is switched to be opened and closed as in a conventional radar oscillator.

Abstract: In order to enable intermittent output of an oscillation signal without essentially producing a leak in response to a pulse signal indicating a transmission timing of a radar wave, a radar oscillator is provided which employs a configuration in which an operation of an oscillating unit itself is alternately changed between an oscillating state and an oscillation stop state by a switch, rather than a configuration in which an output passage of an oscillation signal is switched to be opened and closed as in a conventional radar oscillator.

Abstract: A radar oscillator has an oscillation unit and first and second switch circuits. The first switch circuit turns off an electric power supply to an amplifier in a non-input period of a pulse signal to set the oscillation unit in a non-oscillation state and turns on the electric power supply to the amplifier in an input period of the pulse signal to set the oscillation unit in an oscillation state. The second switch circuit turns on an electric power supply to an LC resonator in a period immediately before the pulse signal is input in a period in which the pulse signal is not input to supply a current to the LC resonator and turns off the electric power supply to the LC resonator at a timing at which the pulse signal is input, so that activation of an oscillation operation of the oscillation unit is accelerated.

Abstract: The present invention, in order to enable intermittent output of an oscillation signal without essentially producing a leak in response to a pulse signal indicating a transmission timing of a radar wave, employs a configuration in which an operation of an oscillating unit (21) itself of a radar oscillator is alternately changed between an oscillating state and an oscillation stop state by a switch (30), not a configuration in which an output passage of an oscillation signal is switched to be opened and closed as in a conventional radar oscillator.

Abstract: A pair pulse generator generates one pair of pulses including a first pulse having a predetermined width and a second pulse having a width equal to that of the first pulse and being behind from the first pulse by preset time each time a transmission designation signal is received. A burst oscillator performs an oscillation operation in a period in which one pair of pulses are input to output a signal having a predetermined carrier frequency as a first burst wave in synchronism with the first pulse and also output the signal of the predetermined carrier frequency as a second burst wave in synchronism with the second pulse, and stops the oscillation operation in a period in which one pair of pulses are not input. A transmitting unit emits the first burst wave into an exploration target space as a short pulse wave. A receiving unit receives a reflected wave and detects the second burst wave as a local signal. A control unit variably controls an interval between the first pulse and the second pulse.

Abstract: A transmitting unit emits a short pulse wave which satisfies a predetermined spectrum mask from an antenna into space. A receiving unit receives a reflected wave produced by an object existing in space of the short pulse wave emitted by the transmitting unit. A signal processing unit analyzes the object based on an output signal from the receiving unit. The transmitting unit has a pulse generator which outputs pulse signals each having a predetermined width at a predetermined frequency, and a burst oscillator which receives the pulse signal output from the pulse generator and performs an oscillation operation for time corresponding to the width of the pulse signal to output the short pulse signal. A width and a cycle of the pulse signal and an oscillation frequency of the burst oscillator are set such that almost an entire main lobe of a spectrum of the short pulse wave falls within a range of 24.0 to 29.

Abstract: A radar oscillator has an oscillation unit and first and second switch circuits to intermittently output an oscillation signal depending on a pulse signal representing a transmission timing of a transmitting radar signal without causing leakage. The first switch circuit turns off an electric power supply to an amplifier in a non-input period of the pulse signal to set the oscillation unit in a non-oscillation state and turns on the electric power supply to the amplifier in an input period of the pulse signal to set the oscillation unit in an oscillation state.

Abstract: The present invention, in order to enable intermittent output of an oscillation signal without essentially producing a leak in response to a pulse signal indicating a transmission timing of a radar wave, employs a configuration in which an operation of an oscillating unit (21) itself of a radar oscillator is alternately changed between an oscillating state and an oscillation stop state by a switch (30), not a configuration in which an output passage of an oscillation signal is switched to be opened and closed as in a conventional radar oscillator.