Wasy Research

Circular buffer for real-time applications with equal input and output data rate

In this post, we will discuss two types of real-time processing applied to global navigation satellite system (GNSS) signal processing. In addition, we will discuss a circular buffering system for real-time applications with equal data rate of input and output.

Metrology

Manufacturing and space: Multilateration using ranging signals for large scale dimensional metrology

Multilateration is a position determination method that is locating an object by accurately computing the distance between the object and three or more other objects (e.g., transmitter or laser tracker) with known positions. This method is also known as hyperbolic position determination.

Tolerancing

Manufacturing and space: How GD&T tolerancing is instrumental for rocket and satellite launcher

Sending satellites to space requires a launcher that can defy the gravity of earth and put the satellites into their orbits in space outside the earth’s gravity region. This post briefly presents the application of GD&T (from manufacturing discipline) to space applications.

Research

Research how to: A practical guide

Research is a challenging task and requires a substantial effort and resource including both time and monetary. However, we must (or most of us already) believe that research is a value-creation activity instead of a cost-centre activity.

GNSS

TUTORIAL on how to measure RF receiver noise: A practical approach

In this post, we will provide tutorial on how to quantify a receiver (instrument) noise. In addition, the basics of various unit of measurements related to signal processing will be discussed.

GNSS

GNSS signal tracking: The need for both PLL and DLL tracking

In this post, we briefly show what PLL and DLL are, why they need to be both implemented and the effect when we only use either PLL or DLL tracking loops.

Research

Research management: How to manage knowledge workers

Management is a well-known term that everybody has heard before. All aspects of our lives require management, from managing our home, and our study to our work or business.

Research

Research marketing: How to promote our research

Marketing has been considered important in all aspects of activity related to relationship with other entities such as customer.

Research

Competitive research strategy: Analysing factors toward leading research

Research world is very competitive, especially today, where resources (such as articles and technical/scientific reports) are abundant, and relatively easy and cheap to access. Like in industry, to be competitive in research, we need to have a strategy.

GNSS

Brief discussions on uncertainty contributors of GNSS-based positioning (Part 4)

Satellite orbit, the last main components required to calculate GNSS-based positioning, will be discussed in this post as well as the uncertainty contributors that are relevant to the satellite orbit estimation.

GNSS

Brief discussions on uncertainty contributors of GNSS-based positioning (Part 3)

Pseudorange is the distance between a global navigation satellite system (GNSS) satellite and a receiver when the offset of the receiver clock (with respect to GNSS timeline) is not yet corrected.

GNSS

Brief discussions on uncertainty contributors of GNSS-based positioning (Part 2)

In this post, we will start from the highest view of how we can estimate a position from at least four GNSS satellite ranging signals.

GNSS

Brief discussions on uncertainty contributors of GNSS-based positioning (Part 1)

In this blog series, we will discuss about uncertainty contributors on GNSS positioning and open a way to estimate the uncertainty for reliable positioning.

GNSS

TUTORIAL: Interacting with Movella XSense IMU sensor in C++

Inertial measurement unit (IMU) sensor is important for global navigation satellite system (GNSS) based positioning, velocity and timing (PNT) solutions.

GNSS

Real-time decoding of NAV messages of Septentrio receiver in C programming language

Septentrio receiver is one of the most used global navigation satellite systems (GNSS) receivers, including u-blox and Novatel GNSS receivers.

GNSS

Reading raw binary IQ data in C/C++ with malloc() and pointer

Digital signal processing (DSP) of radio frequency (RF) data very often deals with read from and write to a binary file with IQ format.

Research

Classic philosophies that have been forgotten: Important factors for research and development

In this post, we will discuss the forgotten classic philosophies (values) that are instrumental for performing high quality research, development and innovation activities.

Metrology

Productive metrology: Evaluating the cost of part inspections

In this third post, we will discuss how the measurement cost affects the total production cost as well as how to correctly calculate the measurement cost to support a decision making for machine selection so that we can lower the total production cost.

Metrology

Productive metrology: The relation between uncertainty and economic benefit

In this second post about productive metrology, we will discuss how a measurement uncertainty can affect the economic benefit of metrology.

Metrology

Productive metrology: The role of metrology to transform data into know-how or wisdom

Metrology has been commonly seen as “cost-centre”. In this first post in the topic of “productive metrology” that is metrology as “profit-centre”, we will start by discussing the philosophical goal of metrology to gain know-how or wisdom.

GNSS

The importance of GNSS satellite clock-bias and orbit correction

The position of a receiver calculated from global navigation satellite system (GNSS) signals is significantly affected by the accuracy of the satellite clock-bias and orbit transmitted by GNSS satellites.

Applied programming

TUTORIAL: MATLAB software inter-connection and cooperation with PYTHON software using pyenv()

In a complex software application, most of the time, the application is written with several programming languages. These programming languages are inter-connected and cooperate together (compatible) to deliver the overall software functionalities.

Metrology

Error compensation for coordinate measuring instrument: Error separation and self-calibration

Rehearsal method is a method to separate combined or coupled errors into separated individual error elements. By separating the combined errors into individual errors, the error quantification of an instrument can be performed without a calibrated artefact and/or calibration instrument.

Metrology

Error compensation for coordinate measuring instrument: The mathematical model of 3-axis coordinate measuring machine (CMM)

The mathematical model of a measuring instrument is important for building the error compensation system for the instrument.

Metrology

Error compensation for coordinate measuring instrument: Steps and calibration instruments

For the implementation of error compensation on measuring instruments or machine tools, there are steps to follow, that are the reconstruction of an error map (via mathematical modelling via analytical or empirical methods) and the calibration process to quantify and characterise the error map.