[7] [7] T Tanaka, S Haruyama. New position detection method using image sensor and visible light LEDs［C］//2009 Second International Conference on Machine Vision, Dubai,2009:150—153.

[8] [8] R Zhang, W D Zhong, K M Qian, et al. Image sensor based visible light positioning system with improved positioning algorithm［J］. IEEE Access,2017(99):1.

[9] [9] C Xie, W Guan, X Wu, et al. The led-id detection and recognition method based on visible light positioning using proximity method［J］. IEEE Photonics Journal,2 018(99):1—2.

[10] [10] H Zhang, C Yang. Efficient coding and detection of ultra-long ids for visible light positioning systems［J］ Optics Express,2018,26(10):13397.

[11] [11] Levenberg, Kenneth. A method for the solution of certain non-linear problems in least squares［J］. Quarterly of Applied Mathematics,1944,2(2):164—168.

[12] [12] Marquardt, Donald W. An algorithm for least-squares estimation of nonlinear parameters［J］. Journal of The Society for Industrial & Applied Mathematics,1963,11(2):431.