In recent years primary atomic clocks have emerged as a key technology for many military and civil applications, ranging from missile guiding through synchronization of stocks exchange transactions to wide stripe communication. Moreover, the use of independent time source is becoming more and more important as GPS communication has recently become a victim of jamming and spoofing.

Consequently, AccuBeat LTD, the sole manufacturer of atomic clocks in Israel, initiated a primary clock development in collaboration with the atomchip group in BGU.  The clock will be compact and portable. It is based on Ramsey spectroscopy performed on ultra-cold ⁸⁷Rb atoms during a free fall. This clock is designed to reach stability < 10 ns per day, two orders of magnitude better compared to atomic clocks based on thermal Rb vapor.

Next to a short introduction of the company, we present the recent experimental results of the cold atomic clock technology demonstrator, analyze the contributions for clock's frequency error, and suggest solutions for performance improvement.  We also present the preliminary design of the future engineering model exhibiting size and interface of a commercial product.