Abstract: A composition ratio estimation device estimates a composition ratio of a content having mixed substances with different boiling points in a tank. The content is retained as a liquid in the tank lower part. The substances are partially floatable as a gas or liquid in a space in the tank upper part. The device includes a reference object disposed in the space, a transmitting-receiving unit that transmits radar waves toward the reference object and the surface of the liquid and receives reflected radar waves, a temperature measuring unit that acquires a level at which a boiling point of a floating substance is reached, a dielectric constant calculating unit that stores in advance a physical distance between the unit and the object and calculates a dielectric constant of a space between the unit and the object, and a composition ratio derivation unit that derives a composition ratio of the liquid.

Abstract: A composition ratio estimation device estimates a composition ratio of a content having mixed substances with different boiling points in a tank. The content is retained as a liquid in the tank lower part. The substances are partially floatable as a gas or liquid in a space in the tank upper part. The device includes a reference object disposed in the space, a transmitting-receiving unit that transmits radar waves toward the reference object and the surface of the liquid and receives reflected radar waves, a temperature measuring unit that acquires a level at which a boiling point of a floating substance is reached, a dielectric constant calculating unit that stores in advance a physical distance between the unit and the object and calculates a dielectric constant of a space between the unit and the object, and a composition ratio derivation unit that derives a composition ratio of the liquid.

Abstract: A radar signal detecting apparatus is provided. The radar signal detecting apparatus includes a coupler diverging a part of signal from received signal, a local oscillator outputting local signal, a mixer converting the diverged signal multiplied the local signal into low frequency signal and a detector detecting, a radar signal from the low frequency signal by using a threshold above side lobe.

Abstract: A radar signal detecting apparatus is provided. The radar signal detecting apparatus includes a coupler diverging a part of signal from received signal, a local oscillator outputting local signal, a mixer converting the diverged signal multiplied the local signal into low frequency signal and a detector detecting a radar signal from the low frequency signal by using a threshold above side lobe.

Abstract: The object of the present invention is to provide a simple wireless repeating method and a repeater suitable for application to Time Division Multiple Access-Time Division Duplex communication methods. Transmission data transmitted from a base station and a mobile station at different time slots of a frequency for call channel use is received at a call channel receiver, analyzed every time slot at a frame analyzer and stored at a storage part. The data stored at the storage part is then read by a frame configuration unit on the timing of time slots Tb1 and Tb2 allotted to the base station and the mobile station prior to transmission and transmitted from a transmitter at the frequency for call channel use. The mobile station can therefore make calls with the base station with the same procedure regardless of whether or not a repeater is present or absent.

Abstract: A digital demodulator compensates for frequency offset between modulated and unmodulated carrier signals by detecting the frequency offset during a preamble with a known modulation pattern. Samples obtained during the preamble are stored in a memory during clock recovery, and read from the memory after the recovered clock signal has become stable. Phase offset is detected from a histogram of the phase differences between the two carrier signals, calculated modulo a certain phase angle, and compensation for phase offset is applied. The maximum histogram value is found by comparisons made according to a single-elimination tournament plan. In a diversity receiver, the maximum histogram value is used to select the output data.

Abstract: The shielded area 3 which is shielded from radio waves is provided at the entrance to the protected area 1, for example, installed with medical equipment. The transmitter 6 in the shielded area 3 transmits the control signal 11 to the portable telephone 5, which returns the response signal 12 in response to the control signal 11. The receiver 7 receives the response signal 12 to notify the alarm 8 that the portable telephone 5 in operation. Thus, the alarm indicative of turning off the portable telephone 5 urges the holder 2 thereof not to carry the portable telephone 5 into the protected area 1.

Abstract: If a mobile station or a base station considers it necessary to perform a hand-over, a new base station is selected as a hand-over receiving base station and a hand-over supplying base station is defined as a master base station whereas the hand-over receiving base station is defined as a slave base station depending on the master base station. The slave base station receives a signal from the master base station, compares it with a frame timing signal of the master base station, adjusts a frame phase of the slave base station into a frame phase of the master base station, and adjusts a frame phase of a down link line from the slave base station to the mobile station into a frame phase of a down link line from them aster base station to the mobile station.

Abstract: A coherent phase-shift keying (PSK) detector in a receiver generates an unmodulated carrier signal, without attempting to synchronize the unmodulated carrier signal in frequency or phase to the carrier employed at the PSK transmitter. The instantaneous phase of the received PSK signal is detected with reference to the unmodulated carrier signal to create an instantaneous phase signal. Phase rotation due to frequency offset between the two carrier signals is detected and removed from the instantaneous phase signal, then a remaining phase offset is detected and removed. Data are recovered from the resulting instantaneous phase signal.