
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given ellipse ${C}_{1}:\frac{{x}^{2}}{{a}^{2}}+\frac{{y}^{2}}{{b}^{2}}=1(a>b>0)$, ellipse ${C}_{2}:\frac{{x}^{2}}{4}+{y}^{2}=1$. Point $P$ is a moving point on ellipse $C_{2}$, and line $OP$ intersects ellipse $C_{1}$ at points $A$ and $B$, where $\overrightarrow{OA}=2\overrightarrow{OP}$. <br/>$(1)$ Find the standard equation of ellipse $C_{1}$; <br/>$(2)$ Let $P$ be the point of tangency to draw the tangent line $l$ to ellipse $C_{2}$, and $l$ intersects ellipse $C_{1}$ at points $C$ and $D$. Is the area of quadrilateral $ACBD$ a constant value? If so, find the constant value; if not, find the range of possible values for the area.

Present the answer in LaTex format: \boxed{Your answer}
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