Deteccion de Presencia: Spanish Guide to Presence Detection Technology

Deteccion de presencia (Spanish for "presence detection") is the technology and practice of determining whether one or more human occupants are currently present within a defined space, including the case where the person is sitting motionless, lying down, or sleeping with no visible movement. Modern deteccion de presencia systems use millimeter-wave (mmWave) radar technology at 60 GHz (57–64 GHz) with 7 GHz of bandwidth to detect the micro-Doppler signature of human breathing at 0.2–0.5 Hz from ranges of 6–8 meters, achieving a stationary-occupant true positive rate above 99% in controlled testing and above 95% in real-world deployment, with a false positive rate below 1% over a 24-hour period. The deteccion de presencia is fundamentally different from motion detection (deteccion de movimiento), which uses passive infrared (PIR) sensors that can only detect moving occupants and are unable to detect a stationary person. The deteccion de presencia is deployed in hotel rooms (habitaciones de hotel) for housekeeping coordination and energy management, in offices (oficinas) for occupancy-based HVAC and lighting control, in healthcare facilities (centros de salud) for fall detection (deteccion de caídas) and patient monitoring, and in residential smart homes (hogares inteligentes) for automated lighting and climate control.

This guide provides a comprehensive overview of deteccion de presencia, covering the technology, the performance characteristics, the use cases, and the selection criteria for choosing the right system for a specific application. The guide is written in English to serve the international Spanish-speaking audience that searches for deteccion de presencia but reads technical content in English.

Deteccion de Presencia: The Technology

The technology behind modern deteccion de presencia is millimeter-wave (mmWave) radar.

Deteccion de Presencia: mmWave Radar Basics

A mmWave radar deteccion de presencia system emits a frequency-modulated continuous wave (FMCW) chirp that sweeps across a defined bandwidth (typically 7 GHz at 60 GHz) over a short period. The reflected signal from objects in the detection zone is mixed with a copy of the transmitted chirp, producing a beat signal whose frequency is proportional to the range of the target. By performing a Fast Fourier Transform (FFT) on the beat signal, the system can determine the range of every object in the detection zone with a resolution of approximately 2.1 cm.

The system then analyzes the phase of the beat signal across successive chirps to determine the velocity of the targets. A stationary person produces a beat signal with a slowly varying phase (due to the micro-motion of breathing), while a stationary chair produces a beat signal with a constant phase. By analyzing the phase variation (the micro-Doppler signature), the deteccion de presencia system can distinguish a stationary human from a stationary object, enabling true presence detection.

Deteccion de Presencia: Micro-Doppler and Breathing Detection

The micro-Doppler signature of human breathing is the key to detecting stationary occupants. The periodic motion of the chest wall during breathing (amplitude 5–20 mm, frequency 0.2–0.5 Hz) produces a Doppler modulation that is clearly detectable by a 60 GHz mmWave system with 7 GHz of bandwidth.

A well-designed deteccion de presencia system uses signal processing techniques to extract the breathing signature from the radar return, distinguish it from background noise (HVAC airflow, building vibration, fan motion), and use it as a positive indicator of human presence. The result is a system that can reliably confirm the presence of a sleeping adult at 4 m with a true positive rate above 99% in controlled testing.

Deteccion de Presencia: Why PIR Sensors Cannot Detect Stationary Occupants

A passive infrared (PIR) sensor, used for motion detection (deteccion de movimiento), cannot detect stationary occupants. The PIR sensor detects changes in infrared radiation across its field of view, and a stationary person does not produce a change in the radiation pattern. The PIR sensor therefore reports "no motion" within 10–30 minutes after the last movement, even if the room is occupied.

This is the fundamental limitation that makes a PIR sensor unsuitable for deteccion de presencia in applications where the occupant may be stationary for extended periods.

Deteccion de Presencia: Performance Metrics

The performance of a deteccion de presencia system is characterized by several key metrics.

Deteccion de Presencia: Stationary-Occupant True Positive Rate

The stationary-occupant true positive rate (TPR) is the percentage of time that a stationary human occupant is correctly reported as present. For a 60 GHz mmWave system, the TPR is above 99% in controlled testing and above 95% in real-world deployment.

Deteccion de Presencia: False Positive Rate

The false positive rate (FPR) is the percentage of time the system reports presence when the room is actually empty. For a well-designed deteccion de presencia system, the FPR is below 1% over a 24-hour period.

Deteccion de Presencia: Detection Range

The detection range of a 60 GHz mmWave system is 6–8 m for stationary occupants and 8–12 m for moving occupants when ceiling-mounted at 2.5–3.0 m.

Deteccion de Presencia: Detection Latency

The detection latency is the time between an occupant entering the detection zone and the system reporting the change. For a deteccion de presencia system, the latency is typically 0.5–3 seconds.

Deteccion de Presencia: Applications

The deteccion de presencia is deployed in a wide range of applications in Spanish-speaking markets.

Deteccion de Presencia: Hotel Rooms (Habitaciones de Hotel)

Hotel rooms are the canonical application for the deteccion de presencia. A 60 GHz ceiling-mounted system can reliably detect whether a guest is in the room throughout their stay, including when they are sleeping, and feeds the occupancy data to the building management system for housekeeping coordination and the HVAC system for energy management.

Deteccion de Presencia: Offices (Oficinas)

Offices use the deteccion de presencia for per-room HVAC and lighting control, conference room availability detection, and space utilization analytics.

Deteccion de Presencia: Healthcare (Centros de Salud)

Healthcare facilities use the deteccion de presencia for fall detection, bed-exit alerting, and occupancy-based environmental control. The privacy profile of mmWave radar (no images, non-invasive) makes it suitable for deployment in private spaces.

Deteccion de Presencia: Residential Smart Home (Hogares Inteligentes)

Residential smart homes use the deteccion de presencia for occupancy-based lighting, HVAC control, and security monitoring.

Deteccion de Presencia: Selection Criteria

Selecting the right deteccion de presencia system for a specific application requires evaluating several criteria.

Deteccion de Presencia: Technology

For indoor presence detection, 60 GHz mmWave radar is the default choice, providing reliable stationary-occupant detection with an excellent privacy profile.

Deteccion de Presencia: Form Factor

For most applications, a ceiling-mounted sensor (70 mm diameter ceiling puck) is the right choice. For corridors and entryways, a wall-mounted sensor may be preferred.

Deteccion de Presencia: Connectivity

The connectivity should match the existing infrastructure. For hotel deployments, Zigbee is common. For office deployments, WiFi or PoE with BACnet is common. For residential deployments, Matter or Zigbee is common.

Deteccion de Presencia: Certifications

The deteccion de presencia system should carry the required certifications. In Spain and the EU, CE marking is required. In Mexico, IFETEL is required. In Argentina, ENACOM is required.

Deteccion de Presencia: Final Recommendation

The deteccion de presencia is a mature, reliable technology that has become the default choice for presence detection in hotel rooms, offices, healthcare facilities, and residential smart homes across Spanish-speaking markets. The 60 GHz mmWave radar is the default technology, providing reliable stationary-occupant detection, an excellent privacy profile, and a compact form factor.

For a procurement team or a consumer selecting a deteccion de presencia system, the right approach is to start with a clear definition of the application requirements, then evaluate the available systems against those requirements, then select a vendor with a proven track record in the target vertical, and then execute a pilot before committing to a full deployment. With the right system, correctly installed and integrated, the deteccion de presencia can deliver a level of occupancy awareness that is impossible to achieve with PIR-based motion sensors, and can justify the higher unit cost through improved energy efficiency, better occupant experience, and more accurate occupancy data for downstream analytics.