A pulse compression radar for performing pre-distortion is provided, which has a configuration simplified in circuit structure. A radar apparatus (pulse compression radar) includes an antenna configured to externally transmit a transmission signal transmitted by a power amplifier and receive a reflection signal caused thereby as a reception signal. The radar apparatus includes a reception circuit configured to propagate this reception signal to a radar image creating module. The radar apparatus corrects beforehand, by utilizing the transmission signal (feedback signal) transmitted from the power amplifier, a transmission signal to be inputted into the power amplifier so as to cancel distortion of the transmission signal caused by amplification effect of the power amplifier. Further, a circuit where the reception signal passes and a circuit where the feedback signal passes share a part of each other.

A pulse compression radar for performing pre-distortion is provided, which has a configuration simplified in circuit structure. A radar apparatus (pulse compression radar) includes an antenna configured to externally transmit a transmission signal transmitted by a power amplifier and receive a reflection signal caused thereby as a reception signal. The radar apparatus includes a reception circuit configured to propagate this reception signal to a radar image creating module. The radar apparatus corrects beforehand, by utilizing the transmission signal (feedback signal) transmitted from the power amplifier, a transmission signal to be inputted into the power amplifier so as to cancel distortion of the transmission signal caused by amplification effect of the power amplifier. Further, a circuit where the reception signal passes and a circuit where the feedback signal passes share a part of each other.

A radar apparatus for performing pre-distortion is provided, which has a configuration instantly transmittable of a transmission signal without distortion even in a case where a power is turned off. A radar apparatus (pulse compression radar) calculates a correction coefficient based on a transmission signal before distortion occurs therein and a transmission signal (feedback signal) outputted by a power amplifier. The radar apparatus corrects the transmission signal outputted by an ideal transmission signal memory while taking into consideration distortion that is caused in the amplification by the power amplifier, by using the correction coefficient. The radar apparatus includes a non-volatile memory configured to store the calculated correction coefficient as backup.

A memory access unit for handling transfers of samples in a d-dimensional array between a one of m data buses, where m≧1, and k*m memories, where k≧2, is disclosed. The memory access unit comprises k address calculators, each address calculator configured to receive a bus address to add a respective offset to generate a sample bus address and to generate, from the sample bus address according to an addressing scheme, a respective address in each of the d dimensions for access along one of the dimensions from the bus address according to an addressing scheme, for accessing a sample. The memory access unit comprises k sample collectors, each sample collector operable to generate a memory select for a one of the k*m memories so as to transfer the sample between a predetermined position in a bus data word and the respective one of the k*m memories. Each sample collector is configured to calculate a respective memory select in dependence upon the address in each of the d dimensions such that each sample collector selects a different one of the k*m memories so as to allow the sample collectors to access k of the k*m memories concurrently. A memory controller may comprise m memory access units for handling transfers of samples in a d-dimensional array between m data buses and k*m memories.

Various systems, devices, and methods for contactless sleep tracking are presented. Based on data received from a contactless sensor, such as a radar sensor, determine that a user has entered a sleep state. A transition time may be determined at which the user transitions from the sleep state to an awake state. An environmental event, based on data received from an environmental sensor, may be identified as occurring within a time period of the transition time. The user waking may be attributed to the environmental event based on the environmental event occurring within the time period of the transition time. An indication of the attributed environmental event as a cause of the user waking may be output.

Various devices, systems and methods for performing contactless monitoring of the sleep of multiple users over a same time period are presented herein. Clustering may be performed based on data received from a radar sensor. Based on the clustering performed on the data received from the radar sensor, a determination may be made that two users are present within the region. In response to determining that two users are present, a midpoint location may be calculated between the clusters. A first portion of the data may be mapped to a first user and a second portion of the data may be mapped to a second user based on the calculated midpoint. Separate sleep analyses may be performed for the first user and the second user.

Various arrangements for performing an initial setup process of a sleep tracking device are presented. User input may be received that requests a sleep tracking setup process be performed. In response to the user input, a detection process may be performed based on data received from the radar sensor to determine whether a user is present and static. In response to the detection process determining that the user is present and static, a consistency analysis may be performed over a time period to assess a duration of time that the user is present and static. Based on the consistency analysis, sleep tracking may be activated such that when the user is detected in bed via the radar sensor, the user's sleep is tracked.

This electronic device comprises a plurality of transmitting antennas installed in a mobile body and a transmission controller configured to control transmitted waves to be transmitted from the plurality of transmitting antennas to form a beam in a predetermined direction. The transmission controller controls the predetermined direction in which the beam is formed according to a steering direction of the mobile body.

An electronic device detects an object reflecting transmitted waves based on transmitted signals transmitted as the transmitted waves from transmitting antennas and received signals received from receiving antennas as reflected waves obtained by reflection of the transmitted waves. The electronic device determines that the object have been detected when the peak in the result obtained by performing a Fourier transform process on the beat signals generated based on the transmitted and received signals is equal to or higher than a predetermined threshold value. The electronic device sets a predetermined threshold value based on an object detection probability.

A radar transmitter Tx.sub.s (s=1) generates a baseband transmission signal by modulating a first code sequence having a prescribed code length on the basis of a first transmission timing signal and gives a first transmission phase shift corresponding to each transmission cycle to the transmission signal. A radar receiver Tx.sub.s (s=2) generates a baseband transmission signal by modulating a second code sequence having the prescribed code length on the basis of a second transmission timing signal and gives, to the transmission signal, a second transmission phase shift that correspond to each transmission cycle and opposite to the first transmission phase.