Speed Measurement and Error Simulation for Three Stations Linear Array with Very Short Baseline

The method by single station speed measurement presented in reference is further expanded. This calculation method can directly survey the uniform flight speed of target, only based on the actual measured frequency, by three stations linear array with very short baseline. Firstly, making use of Doppler changing rate, we can obtain both the specific value of advance angle and the specific value of frequency difference between adjacent measuring stations. Then, by combining it with the specific value of Doppler shift between adjacent measuring stations, the initial solution of advance angle can be solved. In order to exactly solve the advance angle, the relationship between tangential velocity and Doppler shift is found by decomposing Doppler shift in each detection nodes which is used for iterative computation. And then, the tangential velocity of Doppler changing rate is replaced by the one obtained from Doppler shift and iterative computing equation is constructed. The elementary analog calculation shows that analog error is not inversely proportional to basal line length and the iterative program can still produce true result when the basal line length is by far less than a wavelength.