A method for determining the fill level of a fill substance located in a container. The method, which is based on the pulse travel time principle, is distinguished by the fact that extra-range echos can be recognized. For this, the method includes two method portions, in which microwave pulses are transmitted in the direction of the surface of the fill substance with different repetition rates in measuring cycles following one after the other. In each method portion, travel times are ascertained. The fill level is ascertained based on the first travel time and/or based on the second travel time, to the extent that they approximately agree. Otherwise, it is assumed that such echo pulses concern extra-range echos. Thus, by means of the method of the invention, it can be assured for pulse radar-based fill-level measurements that extra-range echos do not result in erroneous fill level values.

In an ultra-wideband (UWB) communication system, methods are disclosed for transmitting packets in multiple portions, each having a different pulse repetition frequency (PRF). Methods are also disclosed for transmitting packets dis-continuously.

A method for determining the fill level of a fill substance located in a container. The method, which is based on the pulse travel time principle, is distinguished by the fact that extra-range echos can be recognized. For this, the method includes two method portions, in which microwave pulses are transmitted in the direction of the surface of the fill substance with different repetition rates in measuring cycles following one after the other. In each method portion, travel times are ascertained. The fill level is ascertained based on the first travel time and/or based on the second travel time, to the extent that they approximately agree. Otherwise, it is assumed that such echo pulses concern extra-range echos. Thus, by means of the method of the invention, it can be assured for pulse radar-based fill-level measurements that extra-range echos do not result in erroneous fill level values.

A method of measuring the phase of a response signal relative to a periodic excitation signal, comprises the steps of producing for each cycle of the response signal two transitions synchronized to a clock and framing a reference point of the cycle; swapping the two transitions to confront them in turns to the cycles of the response signal; measuring the offsets of the confronted transitions relative to the respective reference points of the cycles; performing a delta-sigma modulation of the swapping rate of the two transitions based on the successive offsets; and producing a phase measurement based on the duty cycle of the swapping rate.

A method of measuring the phase of a response signal relative to a periodic excitation signal, comprises the steps of producing for each cycle of the response signal two transitions synchronized to a clock and framing a reference point of the cycle; swapping the two transitions to confront them in turns to the cycles of the response signal; measuring the offsets of the confronted transitions relative to the respective reference points of the cycles; performing a delta-sigma modulation of the swapping rate of the two transitions based on the successive offsets; and producing a phase measurement based on the duty cycle of the swapping rate.

Transmission radars (1-n.sub.TX) (n.sub.TX=1, 2, . . . , N.sub.TX) generate mutually different modulation codes Code(n.sub.TX, h) by cyclically shifting the same code sequence by mutually different cyclic shift amounts (n.sub.TX), and generate mutually different transmission RF signals (4-n.sub.TX) using the mutually different modulation codes Code(n.sub.TX, h). As a result, the number of transmission radars 1-n.sub.TX can be made larger, and target detection accuracy can be made higher than in a case where orthogonal codes are used as mutually different modulation codes.

A radar sensing function is performed in a mobile communication device that operates in a Time Division Duplex (TDD) wireless communication system having an air interface that comprises a plurality of uplink symbol times associated with symbols transmitted in an uplink direction and a plurality of downlink symbol times associated with symbols transmitted in a downlink direction, and in which each transmitted symbol from a plurality of transmitted symbols has a corresponding cyclic prefix that is transmitted immediately before the corresponding transmitted symbol, and that is a repetition of an end part of the corresponding transmitted symbol. Information about a path delay between the mobile communication device and a receiver is used as one of one or more bases to determine a timing of a radar operation window having a duration that is shorter than a duration of a cyclic reception window of the receiver and comprising a radar signal transmission time and a radar backscatter reception period. The determined timing of the radar operation window is configured to cause the radar signal, when transmitted from the mobile communication device at the determined radar signal transmission time, to arrive at the receiver during a portion of the cyclic prefix reception window of the receiver. The radar signal is transmitted at the determined time.

There is provided a radar device with which the density of transmitted signals can be made uniform in relation to orientation even if the rotation rate of an antenna fluctuates, and interference removal processing can be given a simpler configuration. A radar device that transmits and receives signals while rotating an antenna comprises a motor, a transmission pulse generator, and a transmitter. The motor rotates the antenna (antenna main body). The transmission pulse generator generates transmission timing pulses for transmission signals from the antenna based on the rotational angle of the antenna main body. The transmitter transmits transmission signals via the antenna according to the transmission timing pulses generated by the transmission pulse generator.

The present disclosed subject matter relates to a method for measuring the distance of targets in the surroundings by way of a time-of-flight measurement of pulses reflected at said targets, in particular laser pulses, said method comprising: emitting a sequence of transmission pulses having varying pulse intervals, and receiving at least one receive pulse after each one of two different transmission pulses; for each receive pulse: generating a group of M candidate distances, each based on a different transmission pulse among M transmission pulses preceding the receive pulse, wherein each candidate distance is assigned to the corresponding transmission pulse on which it is based; for each candidate distance: determining a weighting value on the basis of at least the closest of the candidate distances assigned to such a transmission pulse which is adjacent to the transmission pulse to which the candidate distance being considered in this determining process is assigned; for each group: selecting the candidate distance with the highest weighting value as the distance measurement value of the receive pulse for which the group was generated.

A method of mitigates RF interference from an RF interferer. An RF signal is received at an RF transceiver during a time period. The RF signal that includes, for at least a portion of the time period, an interference signal having a cyclic transmission pattern with at least one deterministic feature. The received RF signal is analyzed in order to determine timing information for the at least one deterministic feature and the associated interference signal cyclic transmission pattern. Transmission of the RF signals from the RF transceiver are synchronized with the interference signal transmission pattern based on the determined timing information to mitigate interference between the RF signals and the interference signal.