The present disclosure relates to digital signal processing architectures, and more particularly to a modular object-oriented digital system architecture ideally suited for radar, sonar and other general purpose instrumentation which includes the ability to self-discover modular system components, self-build internal firmware and software based on the modular components, sequence signal timing across the modules and synchronize signal paths through multiple system modules.

Aspects of the present disclosure are directed to radar communications with disparate pulse repetition intervals, as may be implemented with radar transmission, receiver and processing circuitry. As may be utilized in accordance with one or more embodiments herein, time division multiplexing (TDM) multi-input multi-output (MIMO) radar signals are transmitted by transmitting sets of successive radar signals, each set having a pulse repetition interval (PRI) that is different than the PRI of sets of radar signals transmitted in another one of the sets. Positional characteristics of a target may be ascertained based on the PRI used in each of the sets and on phase characteristics of ones of the radar signals reflected from the target.

Method and device for radar transmission and reception by dynamic change of polarization notably for the implementation of interleaved radar modes are provided. A radar transmission-reception method and a device for implementing this method, the method alternatively implementing two modes of operation, a short range mode exploiting short pulses and a long range mode exploiting modulated long pulses, the method consisting, for each mode, in: producing two synchronous radiofrequency (RF) transmission signals having between them a phase-shift θ of controllable given value; radiating two radiofrequency waves, each corresponding to one of the transmission RF signals produced, by means of two colocated radiating sources each having a given polarization axis; handling the reception of the backscattered radiofrequency signals picked up by each of the radiating sources, and delivering two radiofrequency (RF) reception signals each corresponding to a radiofrequency signal picked up by one of the radiating sources, a phase-shift θ′ being applied between the two signals delivered, θ′ being able to be determined as being equal to θ.

A method of generating a reference signal for transmission over a wireless communication channel comprises generating a first signal of a first characteristic, generating a second signal with second characteristic, scaling the second signal at least in time and an amplitude to form a scaled signal and iteratively adding the scaled signal to the first signal to generate the reference signal. The iteratively adding comprises time indexing the first signal with plurality of time points, adding the scaled signal to first signal at each time point in the plurality of time points, computing a cost function to determine the cost of adding the scaled signal at each time point in the plurality of time points, selecting a set of time points that indicate reduction in the cost when the scaled signal is added and adjusting the amplitude of the scaled signal at each time point in the set of time points to reduce the cost.

This document describes techniques, apparatuses, and systems for a parameter defined stepped frequency waveform for a radar system. A radar system transmits radar transmit signals including a parameter defined stepped frequency waveform with a specific change in frequency between chirps. The specified change in frequency may increase the signal to noise ratio of radar receive signals reflected off an object in the field of view. The radar receive signals may then be transformed into the frequency domain to determine a range and range rate of the object in the field of view. The range and range rate determined from the representation of the radar receive signals in the frequency domain may be output to a radar tracker to enable tracking of the object in the field of view. In doing so, accurate radar tracks may be generated that robustly track objects in the field of view of the radar system.

A method for operating a stepped frequency radar system is disclosed. The method involves performing stepped frequency scanning across a first frequency range using frequency steps of a first step size, the stepped frequency scanning performed using at least one transmit antenna and a two-dimensional array of receive antennas, changing from the first step size to a second step size, wherein the second step size is different from the first step size, and performing stepped frequency scanning across a second frequency range using the at least one transmit antenna and the two-dimensional array of receive antennas and using frequency steps of the second step size.

A detection method for a given mission comprises at least: one phase of analysing the environment using a waveform chosen beforehand, the signals acquired with this waveform being analysed by processing means in order to deduce therefrom environmental characteristics; and one phase of generating an optimal detection wave depending on the environmental characteristics and characteristics of the mission.

A radar apparatus includes: a radar transmission signal generator, which in operation, outputs a plurality of radar signals; a switching controller, which in operation, switches among plurality of transmitting antennas in sequence in a determined order to every one radar signal transmission period; and a radio transmitter, which in operation, transmits one radar signal every one radar signal transmission period through a allocated transmitting antenna to which switching has been made. A plurality of transmission timings at which the allocated transmitting antennas to which switching have been made transmit each of the plurality of radar signals within a determined period have identical time differences from a reference timing within the determined period.

Method for determining product surface distance in a tank comprising: i) generating a transmission signal as a first pulse train; ii) generating a reference signal having a second pulse train by time delaying said first pulse train; wherein each pulse in said first and second pulse trains have essentially identical waveforms and pulse repetition frequency; iii) guiding said transmission signal towards the product surface; iv) receiving a reflected signal; v) forming a correlation value based on a time correlation between the reference signal and the reflected signal; vi) carrying out steps i) to v) in sequence for at least three different pulse repetition frequencies, until at least three pairs of correlation values and associated pulse repetition frequencies have been stored; vii) determining said distance based on said at least three pairs of correlation values and associated pulse repetition frequencies, and said fixed time delay.

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.