Model Type（模型類型）：列表框顯示了FIR Fit Plots子選項卡上選擇的當(dāng)前模型類型谢床。
Model Parameters and Limits/Confidence（模型參數(shù)和限制/置信度）：顯示的參數(shù)量取決于設(shè)置的模型類型肪笋。在每個單元格中顯示了參數(shù)值和上下限（或置信區(qū)間）。與該輸入—輸出組相對應(yīng)的擬合統(tǒng)計在每個單元格表的底行顯示弛说。
此窗口提供的一些其他選項：
Parameter Constraints（參數(shù)約束）：通過適當(dāng)?shù)馗纳舷孪拗低茫瑢?shù)設(shè)置約束莺丑。你可以將模型參數(shù)Freeze（凍結(jié)）為當(dāng)前值，并使用右鍵單擊菜單選項將模型的所有參數(shù)凍結(jié)為當(dāng)前值煞肾。你還可以凍結(jié)給定單元格中的所有參數(shù)。凍結(jié)參數(shù)將以淡藍色背景顏色突出顯示嗓袱。
你可以使用Unfreeze（解凍）和Unfreeze all（解凍所有）同時取消凍結(jié)參數(shù)或所有約束參數(shù)籍救。包含有凍結(jié)模型限制的單元格變灰。你還可以選擇使用FIR Fit的結(jié)果重新初始化單元格中的所有模型參數(shù)渠抹。右鍵單擊選項Freeze Model（凍結(jié)模型）蝙昙，Unfreeze Model（解凍模型），Unfreeze all（解凍所有）和Reinitialize Model From FIR Fit（從FIR中重新初始化模型）僅在PAR Fit設(shè)置模式中可用梧却。在擬合PAR模型后奇颠，只有右鍵菜單選項中的Freeze Parameter（凍結(jié)參數(shù)）可用。再次單擊FIR Fit將重新激活其他右鍵單擊選項放航。
Overlay（層疊）
比較FIR fit的階躍響應(yīng)烈拒，從模型簡化得到的參數(shù)模型，以及Overlay（層疊）窗口上辨識的參數(shù)模型广鳍。
Overlay（層疊）窗口由階躍響應(yīng)曲線矩陣組成荆几，在圖表下方有一個圖例表。單擊單元格可獲得與該單元格中的輸入—輸出關(guān)系對應(yīng)的擬合統(tǒng)計數(shù)據(jù)和整體輸出擬合統(tǒng)計搜锰。增益參數(shù)也顯示在此表中伴郁。
層疊窗口字段
Scaling（縮放）：包括Unit（單位）和Normalized（歸一化）縮放選項。
使用Unit（單位）縮放時蛋叼，每個模型階躍響應(yīng)對應(yīng)于輸入中的單位階躍變化焊傅，并且每個單元被縮放以獨立地跨越所繪制階躍響應(yīng)的整個范圍剂陡。
使用Normalized（歸一化）縮放時，每個模型階躍響應(yīng)對應(yīng)于正常變化的階躍變化值狐胎。同一列中的所有單元格具有相同的比例鸭栖，并且它將根據(jù)列上最大正負(fù)增益按比例進行縮放。
**Model Type: **The list box displays the current type of model selected on the FIR Fit Plots subtab.
Model Parameters and Limits/Confidence: The number of parameters displayed depends on the set model type. Parameter values and the high and low limits (or confidence bounds) are shown in each cell. The Fit Stat corresponding to that input-output pair is shown in the bottom row of each cell table.
Some of the other options available in this window:
**Parameter Constraints: **Place constraints on parameters by changing the appropriate low and high values. You can Freeze a model parameter to its current value and also freeze all the parameters of a model to their current values by using the right-click menu options. You can also freeze all parameters within a given cell. Frozen parameters will be highlighted by light blue background color.
You can unfreeze parameters or all constrained parameters at the same time using Unfreeze and Unfreeze all. The cells containing limits of a frozen model are grayed out. You can also choose to reinitialize all the model parameters in the cell with results from the FIR Fit. Right click options Freeze Model, Unfreeze Model, Unfreeze all, and Reinitialize Model From FIR Fit are only available in the PAR Fit setup mode. After fitting PAR Model, only right click menu option Freeze Parameter is available. Clicking on FIR Fit again will reactivate the other right click options.
Overlay
Compare the step responses of the FIR fit, the parametric model resulting from a model reduction, and the identified parametric model on the Overlay window.
The Overlay window consists of a matrix of step response plots with a legend table below the plots. Click on a cell and obtain the Fit Stats corresponding to the input-output relationship in that cell and the overall output Fit Stat. The Gain parameter is also shown in this table.
Overlay Window Fields
Scaling：Options include Unit and Normalized scaling.
With **Unit scaling, each model step response corresponds to a unit step change in the input and each cell is scaled to span the entire range of the plotted step responses independently.
With Normalized **scaling, each model step response corresponds to a step change value of Normal change. All the cells in the same column have the same scale and it will scaled for the largest positive and negative gains over the column.
2016.10.20
