惯导速度辅助接收机跟踪环路算法

针对接收机在强干扰高动态环境难以定位导航的问题,提出基于惯导速度辅助卫星跟踪环路算法,通过惯导速度估算环路多普勒频移,压缩了环路需承载的动态范围,从而减少了环路等效噪声带宽,进而降低了跟踪环路带内干扰,提高了卫星接收机抗干扰能力。对提出算法的普适性、动态性、抗干扰性以及惯导估算误差影响等方面进行了仿真评估,仿真结果验证了算法的正确性,同时证明提出算法相比传统算法,载体运动加速度由91g提升至193g,同时抗干扰能力提升5~8 d B,可以容忍较大惯导辅助信息误差,为算法工程化奠定了基础。

INS velocity-aided receiver tracking loop algorithm

In view that the receiver of inertial navigation system (INS) is hard to locate and navigate in high dynamic and noisy environment, an INS velocity-aided satellite tracking loop algorithm is proposed. The tracking loop’s Doppler shift is estimated by INS velocity, which compresses the needed dynamic range of the tracking loop, thereby decreases the equivalent noise bandwidth of the loop, reduces the tracking loop in-band interference, and improves the anti-jamming ability of satellite receiver. Simulations are made to test the proposed algorithm’s universality, dynamicity, anti-interference capacity and its influences on INS’s estimation errors, and the results prove the correctness of the algorithm and show that the proposed algorithm upgrades the vehicle accelerationto 193g compared to 91g by traditional methods, improves the anti- interference ability by 5-8dB, and can tolerate large estimation error of INS-aided information. These lay the foundation for the algorithm engineering.