Relative navigation between aircraft formations plays a crucial role in modern military operations, particularly when it comes to command decisions, coordination, and situational awareness during collaborative combat scenarios. The ability for aircraft to maintain precise formation flying ensures operational effectiveness, enhances tactical flexibility, and enables coordinated maneuvers, all of which are vital in dynamic combat environments. However, in environments with satellite denial, strong electromagnetic interference, and radio silence, traditional global satellite navigation and data link methods cannot accurately measure the relative positions between aircraft formations, highlighting the urgent need for innovative high-precision navigation technologies.Aiming at the problem that global satellite navigation and data link navigation can not accurately measure the relative position of formation aircraft under the environment of satellite rejection, strong electromagnetic countermeasures and radio silence, this paper proposes an omnidirectional laser grid relative navigation technology, which uses high-power laser as the light source. The laser beam is shaped and divided by a precision optical system to form a laser sector with specific geometry. A high-precision rotating platform is used to generate an omnidirectional laser grid field in the circumferential direction of the aircraft. Through high-precision grid division and coding of the circumferential angle of the aircraft, combined with the specific geometric structure of the laser grid field, high-precision spatial angle positioning of the aircraft is realized. Based on the principle of two-way ranging, the laser grid field emitted by the formation of the aircraft contains the time stamp of the information round trip. The time information is obtained by using the high-sensitivity photodetector and the precision optical system to detect and decode the laser signal, so as to realize the far oblique distance measurement between the formation aircraft and the omnidirectional relative navigation of the formation aircraft.In order to verify the angle measurement and ranging performance of the proposed omnidirectional laser grid relative navigation technology, an omnidirectional laser grid relative navigation test system was built, which included a computer (omnidirectional laser grid relative navigation host computer), a prototype of omnidirectional laser grid navigation (leader, wingman) and a total station. The spatial angle and precise oblique distance of the long plane and the wingman were obtained by using the total station, and the results were compared with those obtained by the omnidirectional laser grid relative navigation system. Four different locations were randomly selected, and the average values of azimuth, height and distance of 100 groups of data were taken as the measured data of the location, and compared with the true value. The experimental results show that the maximum error of azimuth angle, height angle and distance is 0.01°, 0.03° and 0.57 m respectively. To verify the omnidirectional characteristics of the omnidirectional laser grid relative navigation technology, 18 position points were selected in the circumference of the long plane to carry out the azimuth test of the wingman relative to the long plane. The curve trend was consistent with the position of the wingman. The minimum azimuth angle was 1.611° and the maximum azimuth angle was 356.985°. The feasibility of the proposed technology is fully verified.The proposed technology can solve the relative navigation of aircraft formation in the environment of radio silence and radio frequency rejection, which is of significance for the accurate navigation of aircraft formation in such environment. At present, only the relative navigation experiment of a single wingman has been carried out, and the relative navigation performance of multiple wingmen needs to be further verified in the future.