Ultrasonic Sending-Time Scheduling for Multi-Device Indoor Goniometry
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Solution Overview
Problem
In indoor goniometric measurements involving multiple devices, ultrasonic signals from different devices interfere due to varying transmission durations and synchronization errors, making it difficult to accurately distinguish and measure each device.
Innovation Solution
Determine the transmission duration and synchronization error between the device to be measured and the goniometric device, and adjust the sending time of ultrasonic signals to ensure they are received in separate time slots or frequency bands, using methods like TDMA or FDMA to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ultrasonic signals are transmitted simultaneously by multiple devices for goniometric measurement, then measurement efficiency is improved, but signal interference occurs due to varying transmission durations and synchronization errors
Solution Approach 1:
The patent divides the signal transmission process into distinct time slots for different devices. Each device is assigned a specific time slot to transmit ultrasonic signals, ensuring that signals from multiple devices do not overlap and interfere with each other. This time-division multiplexing approach segments the originally simultaneous transmission into sequential transmissions, resolving the interference problem while maintaining measurement efficiency.
Solution Approach 2:
The patent implements periodic signal transmission with predetermined time intervals between transmissions from different devices. By establishing a periodic transmission schedule where each device transmits in its designated time slot with appropriate guard intervals, the system eliminates signal interference while preserving the ability to efficiently measure multiple devices in sequence.
2Measurement precision
If transmission duration is extended to improve signal detection accuracy, then measurement precision is improved, but time slot separation becomes more difficult and interference increases
Solution Approach 1:
The patent performs preliminary determination of transmission duration and synchronization error before actual signal transmission. By calculating the required time slot length and guard interval duration in advance based on the maximum expected transmission duration and measured synchronization errors, the system optimizes time slot allocation to accommodate precise signal detection while preventing overlap between adjacent time slots.
Solution Approach 2:
The patent employs feedback mechanisms where the goniometric device measures synchronization errors and transmission characteristics, then uses this information to adjust time slot allocations and guard intervals. This closed-loop approach ensures that time slots are sufficiently long for accurate detection while maintaining adequate separation to prevent interference, dynamically optimizing the balance between detection accuracy and time efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately controls the receiving time of ultrasonic signals from different devices, enabling precise goniometric measurements by ensuring each signal is received in a distinct time slot or frequency band, thus overcoming interference and achieving accurate measurement.
Implementation Method 1
a goniometric device receives a plurality of ultrasonic goniometric signals sent by a plurality of devices to be measured
Implementation Method 2
the goniometer device receives the ultrasonic goniometric signals sent by different devices to be measured in different receiving time slots
Implementation Method 3
determining a transmission duration and a synchronization error of signal transmission between the device to be measured and a goniometric device
Data Source
AI summary
A sending time determination method includes: determining a transmission duration and a synchronization error of signal transmission between the device to be measured and a goniometric device; determining a receiving time slot for the goniometric device to receive ultrasonic goniometric signal sent by the device to be measured, where the goniometric device is configured to receive ultrasonic goniometric signals sent by a plurality of devices to be measured, and the goniometer device receives the ultrasonic goniometric signals sent by different devices to be measured in different receiving time slots; and determining a sending time of the ultrasonic goniometric signal according to the receiving time slot, the transmission duration and the synchronization error.