Patent ID: 8446931

Claim:
A method of achieving chip timing synchronization between a primary platform and a secondary platform, wherein a primary link is transmitted from the primary platform and is received at the secondary platform, and a secondary link is transmitted from the secondary platform and is received at the primary platform, and the primary link can transition between a clear mode and a spread mode, the method comprising: spreading the secondary link at the secondary platform using a secondary spreading code at a secondary transmission phase which comprises a secondary transmission delta phase, wherein the secondary transmission delta phase comprises a secondary Doppler pre-compensation component for secondary platform movement; despreading the secondary link at the primary platform using the secondary spreading code at a secondary reception phase; tracking the secondary link using a secondary reception delta phase; when operating the primary link in a spread mode: spreading the primary link at the primary platform using a primary spreading code at a primary transmission phase which comprises a primary transmission delta phase, wherein the primary transmission delta phase comprises a primary Doppler pre-compensation component for primary platform movement, and despreading the primary link at the secondary platform using the primary spreading code at a primary reception phase, and tracking the primary link using a primary reception delta phase; and when transitioning the primary link from the clear mode to the spread mode: adjusting the primary transmission delta phase by the difference between the secondary reception delta phase and the primary transmission delta phase at the primary platform; and adjusting the primary reception delta phase to be equal to the secondary transmission delta phase at the secondary platform.