fers_signal::CwSignal Class Reference

Continuous-wave signal implementation. More...

#include "radar_signal.h"

Inheritance diagram for fers_signal::CwSignal:

Collaboration diagram for fers_signal::CwSignal:

Public Member Functions
	CwSignal ()=default
	~CwSignal () override=default
	CwSignal (const CwSignal &) noexcept=delete
CwSignal &	operator= (const CwSignal &) noexcept=delete
	CwSignal (CwSignal &&) noexcept=delete
CwSignal &	operator= (CwSignal &&) noexcept=delete
std::vector< ComplexType >	render (const std::vector< interp::InterpPoint > &points, unsigned &size, RealType fracWinDelay) const override
	Renders the signal data.
void	clear () noexcept
	Clears the internal signal data.
void	load (std::span< const ComplexType > inData, unsigned samples, RealType sampleRate)
	Loads complex radar waveform data.
RealType	getRate () const noexcept
	Gets the sample rate of the signal.
unsigned	getSampleCount () const noexcept
	Gets the number of native samples held by this signal.
virtual std::vector< ComplexType >	renderSlice (const std::vector< interp::InterpPoint > &points, RealType outputStartTime, RealType outputSampleRate, std::size_t sampleCount, RealType fracWinDelay) const
	Renders a bounded absolute-time slice on the requested output grid.
virtual bool	isFmcwFamily () const noexcept
	Returns true when this signal belongs to the FMCW waveform family.
ComplexType	sampleAt (RealType time_since_start) const noexcept
	Samples the finite stored complex envelope using the render interpolation filter.

Detailed Description

Continuous-wave signal implementation.

Definition at line 324 of file radar_signal.h.

Constructor & Destructor Documentation

CwSignal() [1/3]

fers_signal::CwSignal::CwSignal ( )

default

~CwSignal()

fers_signal::CwSignal::~CwSignal ( )

overridedefault

CwSignal() [2/3]

fers_signal::CwSignal::CwSignal ( const CwSignal &  )

deletenoexcept

CwSignal() [3/3]

fers_signal::CwSignal::CwSignal ( CwSignal &&  )

deletenoexcept

Member Function Documentation

clear()

void fers_signal::Signal::clear ( )

noexceptinherited

Clears the internal signal data.

Definition at line 347 of file radar_signal.cpp.

    {
        _size = 0;
        _rate = 0;
    }

Referenced by fers_signal::Signal::load().

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getRate()

RealType fers_signal::Signal::getRate ( ) const

noexceptinherited

Gets the sample rate of the signal.

Returns

The sample rate of the signal.

Definition at line 94 of file radar_signal.h.

{ return _rate; }

getSampleCount()

unsigned fers_signal::Signal::getSampleCount ( ) const

noexceptinherited

Gets the number of native samples held by this signal.

Definition at line 97 of file radar_signal.h.

{ return _size; }

isFmcwFamily()

virtual bool fers_signal::Signal::isFmcwFamily ( ) const

virtualnoexceptinherited

Returns true when this signal belongs to the FMCW waveform family.

Reimplemented in fers_signal::FileSignal, fers_signal::FmcwChirpSignal, and fers_signal::FmcwTriangleSignal.

Definition at line 117 of file radar_signal.h.

{ return false; }

load()

void fers_signal::Signal::load ( std::span< const ComplexType >  inData, unsigned  samples, RealType  sampleRate  )

inherited

Loads complex radar waveform data.

Parameters

inData	The input span of complex signal data.
samples	The number of samples in the input data.
sampleRate	The sample rate of the input data.

Definition at line 353 of file radar_signal.cpp.

    {
        clear();
        const unsigned ratio = params::oversampleRatio();
        const auto oversampled_samples = static_cast<std::size_t>(samples) * static_cast<std::size_t>(ratio);
        if (oversampled_samples > std::numeric_limits<unsigned>::max())
        {
            throw std::overflow_error("Oversampled signal sample count exceeds unsigned range");
        }
        _data.resize(oversampled_samples);
        _size = static_cast<unsigned>(oversampled_samples);
        _rate = sampleRate * static_cast<RealType>(ratio);
 
        if (ratio == 1)
        {
            std::ranges::copy(inData, _data.begin());
        }
        else
        {
            upsample(inData, samples, _data);
        }
    }

References fers_signal::Signal::clear(), max, params::oversampleRatio(), and fers_signal::upsample().

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operator=() [1/2]

CwSignal & fers_signal::CwSignal::operator= ( const CwSignal &  )

deletenoexcept

operator=() [2/2]

CwSignal & fers_signal::CwSignal::operator= ( CwSignal &&  )

deletenoexcept

render()

std::vector< ComplexType > fers_signal::CwSignal::render ( const std::vector< interp::InterpPoint > &  points, unsigned &  size, RealType  fracWinDelay  ) const

overridevirtual

Renders the signal data.

For CW signals, this is a no-op.

Returns

An empty vector of complex signal data.

Reimplemented from fers_signal::Signal.

Definition at line 48 of file radar_signal.cpp.

    {
        size = 0;
        return {};
    }

References max.

renderSlice()

std::vector< ComplexType > fers_signal::Signal::renderSlice ( const std::vector< interp::InterpPoint > &  points, RealType  outputStartTime, RealType  outputSampleRate, std::size_t  sampleCount, RealType  fracWinDelay  ) const

virtualinherited

Renders a bounded absolute-time slice on the requested output grid.

Definition at line 413 of file radar_signal.cpp.

    {
        auto out = std::vector<ComplexType>(sampleCount);
        if (_size == 0 || _rate <= 0.0 || outputSampleRate <= 0.0 || points.empty())
        {
            return out;
        }
 
        const RealType timestep = 1.0 / outputSampleRate;
        const int filt_length = static_cast<int>(params::renderFilterLength());
        const auto& interp = interp::InterpFilter::getInstance();
 
        auto iter = points.begin();
        auto next = points.size() > 1 ? std::next(iter) : iter;
        const RealType idelay = std::round(_rate * iter->delay);
        RealType sample_time = outputStartTime;
 
        for (std::size_t i = 0; i < sampleCount; ++i)
        {
            while (sample_time > next->time && next != iter)
            {
                iter = next;
                if (std::next(next) != points.end())
                {
                    ++next;
                }
                else
                {
                    break;
                }
            }
 
            auto [amplitude, phase, fdelay, i_sample_unwrap] =
                calculateWeightsAndDelays(iter, next, sample_time, idelay, fracWinDelay);
            const RealType native_position = (sample_time - points.front().time) * _rate;
            const auto source_index = static_cast<int>(std::floor(native_position));
            RealType source_fraction = native_position - static_cast<RealType>(source_index);
            if (source_fraction < 0.0 && source_fraction > -1.0e-12)
            {
                source_fraction = 0.0;
            }
 
            const RealType combined_delay = fdelay + source_fraction;
            const auto delay_unwrap = static_cast<int>(std::floor(combined_delay));
            fdelay = combined_delay - static_cast<RealType>(delay_unwrap);
            i_sample_unwrap += delay_unwrap;
 
            const auto& filt = interp.getFilter(fdelay);
            const ComplexType accum =
                performConvolution(source_index, filt.data(), filt_length, amplitude, i_sample_unwrap);
            out[i] = std::exp(ComplexType(0.0, 1.0) * phase) * accum;
 
            sample_time += timestep;
        }
 
        return out;
    }

References interp::InterpFilter::getInstance(), max, and params::renderFilterLength().

Referenced by fers_signal::Signal::render().

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sampleAt()

ComplexType fers_signal::Signal::sampleAt ( RealType  time_since_start ) const

noexceptinherited

Samples the finite stored complex envelope using the render interpolation filter.

Times outside [0, duration) return zero; file-backed signals never wrap implicitly.

Definition at line 376 of file radar_signal.cpp.

    {
        if (_data.empty() || _rate <= 0.0 || !std::isfinite(time_since_start) || time_since_start < 0.0 ||
            time_since_start >= static_cast<RealType>(_size) / _rate)
        {
            return {0.0, 0.0};
        }
 
        const RealType position = time_since_start * _rate;
        const auto center = static_cast<long long>(std::floor(position));
        const RealType fraction = position - std::floor(position);
        const auto& filter = interp::InterpFilter::getInstance().getFilter(fraction);
        const auto filter_length = static_cast<long long>(filter.size());
        const auto sample_count = static_cast<long long>(_data.size());
        ComplexType value{0.0, 0.0};
        for (long long tap = 0; tap < filter_length; ++tap)
        {
            const long long sample_index = center + tap - filter_length / 2;
            if (sample_index >= 0 && sample_index < sample_count)
            {
                value += _data[static_cast<std::size_t>(sample_index)] * filter[static_cast<std::size_t>(tap)];
            }
        }
        return value;
    }

References interp::InterpFilter::getFilter(), interp::InterpFilter::getInstance(), max, and position.

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The documentation for this class was generated from the following files:

• packages/libfers/src/signal/radar_signal.h
• packages/libfers/src/signal/radar_signal.cpp