Navigation radar echo wake display method based on double caches

The invention discloses a navigation radar echo wake display method based on double caches. The method comprises the following steps: step 1, adding a memory cache region: adding a memory cache region on the basis of an existing picture cache region; step 2, receiving echoes; 3, fusing and caching the radial echo data A; step 4, caching the picture: when the user performs any operation of eccentricity and range change, emptying the picture cache region; thirdly, reading data from the memory cache region fused in the step 3, and updating the data to a picture cache region; otherwise, directly updating the radial echo data A received in the step 2 to the picture cache region; and 5, drawing a wake. Under the condition of eccentricity or mode switching (display mode switching or motion mode switching), continuous and real display of the wake can be achieved, display diversification can be achieved, operation diversification can also be achieved, and therefore the device can adapt to more complex and changeable m