4D nav

4D Nav


One of the most important tasks for every fulfillment center, manual or automatic, is the need to get the items from the shelves to the outbound process – and to get there fast.

In the robotic automation world, there are many solutions on the market, from robots that walk side by side with workers just to help carry the items (COBOT), to heavy automation infrastructures like shuttle systems. Each of the solutions out there aims to shorten the time spent picking and get the order ready faster.

Caja Robotics’ solution aims to perform as fast as possible with minimum infrastructure changes so the logistics of the process meet the warehouse’s demands while providing great ROI.

To achieve great order delivery times without having to spend a lot of money on fixed, non-flexible construction, Caja created its state-of-the-art 4D Nav advanced algorithm, managed by our cloud. Navigating in a dynamic environment and finding routes by seeing the whole picture, and not just sections of it, is nothing less than revolutionary compared to traditional  AMRS navigation.

Getting there fast in the fulfillment world is much more than getting from point A to B, especially when we consider multi-robot systems being used for replenishment, warehouse optimization, picking, consolidation, and many other processes at the same time. Caja’s solution is built to deliver maximum results in the most optimized manner.

4D nav
4D nav

Caja Robotics’4D nav

A Consolidation process made by Caja’s algorithm creates optimization of storage space usage, together with an option of the same bin with multi-SKU’s inside, brings the fulfillment center space usage to its max.
As the market is bound to peak times and market changes, an easy and fast expansion of a number of robots is possible during peak times or when fulfillment center growth is needed, as Caja robotics’ system is elastic and adaptable.

The apparel fulfillment centers are characterized by different sizes of boxes and even Hangers-based. Caja has a solution for this dynamic world of sizes and materials. Caja has 2 types of robots with specific abilities for each. Both works synchronically and creates a synergetic system.

Caja solution for the Apparel market is not just a picking solution, it is a full-process one, from A-Z

4D Nav advantages

4D nav

Faster sterile

Caja’s robot ‘playground’ is an enclosed and human-free environment, allowing for high speed during both inbound and outbound activity. When the option for unplanned obstacles, such as people, is minimized, our robots can reach much higher speeds. Just think of the difference in speed you can achieve when driving on a highway vs. driving in a pedestrian zone.

4D nav

Our multi-layered algorithms handle prediction problems that are usually only handled at the research level, such as Multi-Agent Path Finding (MAPF). Caja’s 4D navigation technology brings theory to real life for fulfillment center optimization.
4D nav


Sending robots on the shortest route and letting them handle collisions using proximity sensors can create deadlock situation. Caja’s 4D Nav predetermines all routes for all robots by considering every robot’s predicted location at every second. When using this kind of route planning, there is no chance for robots to gridlock.
4D nav

not short

As time is one of the most important factors in warehouse management, but the right routes are not always the shortest routes. While using the shortest route is the best solution for a single robot, it’s not necessarily the case when using multiple robots. A robot on the shortest route will have to slow down or even stop when driving behind another robot or when it reaches a crossroads with another robot. Therefore, the shortest way is not always the fastest, and looking at the entire picture helps us optimize time for the warehouse operation overall instead of for a single SKU.
4D nav


When working in such a way that the backend controls, makes decisions, and supervises the robotic navigation in the warehouse, there are almost no exceptions. The simulation of the route chosen will be 100% accurate. Our machine learning algorithms run huge numbers of simulations that are synchronized with logistics and order demands. Caja’s 4d Nav chooses the best of all simulations. Real-life movements are predicted to the second by our simulations and simulations are optimized in the robotic warehouse planning stage, before we even bring the first robot into the warehouse. Planning simulations are run on the backend, just like the real robots, with no margins of error.
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The 4D Nav enables a unique approach to change.
Local problems– When there’s a pinpoint problem, such as floor damage or obstacles in the way, the 4D Nav technology runs new simulations, avoiding that specific location and choosing new routes with the fastest navigation and minimal changes to the robots‘ instructions.
Robot/Bin problems– A malfunctioning robot or damaged bin doesn’t put the entire operation on hold, as Caja Robotics’ 4D Nav can close a specific section and route all traffic around it. Once the problem is fixed, the selected area is no longer problematic and will be open for traffic again. We have a rate of 99% automatic full recovery with no human interference.
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