Technical Matters
Following from the update of this website, these technical items are all of mainly historical interest, having been written or updated in 2012 or previously. Some now require further updating or removal and other items will be added when necessary.
Normally, when using RIVBJ and RIVCBJ routines in CAPTAIN, it is assumed that the data will be selected or edited so that the initial conditions are near zero. However, in situations where these …
The standard Data-Based Mechanistic (DBM) modeling procedures normally exploit the CAPTAIN identification and estimation routines to produce an efficiently parameterized (parsimonious) model that...
A new and particularly simple refined IV method for estimating discrete and continuous-time transfer function models enclosed within a feedback control system, such as that shown in the Figure, has...
Special TF Optimization in CAPTAIN
Friday, 29 April 2011
For special TF models, such as those constrained to have real eigenvalues (poles) or Hammerstein models, it is possible to embed the rivbj or rivcbj routines into a Matlab lsqnonlin routine. For...
Self-Adaptive Flow Forecasting
Tuesday, 26 April 2011
Over the past ten years, a lot of research and development work has been carried out at Lancaster in connection with real-time flow forecasting (see e.g. Young, 2002, 2010a,2010b; Romanowicz, 2006;...
Large Simulation Model Emulation
Tuesday, 26 April 2011
In association with Marco Ratto and Andrea Pagano at the Joint Research Centre of the EEC at Ispra, Italy, we have been developing an approach to the ‘emulation’ a large computer simulation model by a...
Errors-in-Variables and Rainfall-Flow Modelling
Tuesday, 26 April 2011
The ‘Errors-in-Variables’ (EIV) problem related originally to linear regression model estimation when, in addition to noise on the measurement of the dependent variable, there is noise on the...
Real-Time RIV (RRIV) Estimation
Monday, 25 April 2011
The RIV and RIVC routines in CAPTAIN allow for recursive estimation but only ‘off-line’: i.e. they cannot be applied in ‘on-line’ situations in real-time. The main reason for this is that refined IV...
RIVDD and RIVCDD Estimation of Multiple Input TF Models with Different Denominators
Monday, 25 April 2011
In the current CAPTAIN Package, Multiple Input, Single Output (MISO) transfer function estimation is limited to transfer functions that have a single, common denominator. However prototype rivdd and...